CN115051433A - Battery protection circuit and electronic equipment - Google Patents
Battery protection circuit and electronic equipment Download PDFInfo
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- CN115051433A CN115051433A CN202210665523.2A CN202210665523A CN115051433A CN 115051433 A CN115051433 A CN 115051433A CN 202210665523 A CN202210665523 A CN 202210665523A CN 115051433 A CN115051433 A CN 115051433A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application relates to a battery protection circuit and an electronic device, wherein a first input end of an over-discharge detection circuit inputs over-discharge reference voltage, a second input end of the over-discharge detection circuit inputs over-discharge detection voltage, and an output end of the over-discharge detection circuit is connected with a delay circuit and an output conversion circuit; the drive control circuit is connected with the delay circuit; the control end of the power switch tube is connected with the driving control circuit, the substrate of the power switch tube is connected with the driving control circuit, the first end of the power switch tube is connected with the negative end of the charger, and the second end of the power switch tube is connected with the negative end of the battery; the first input end of the charger detection circuit is connected with the second end of the power switch tube and the negative end of the battery, the second input end of the charger detection circuit is connected with the negative end of the charger, the positive end of the battery and the positive end of the charger, and the output end of the charger detection circuit is connected with the output conversion circuit. The scheme realizes power amplifier charging when the power switch tube is in a conducting state for most of time, and avoids charging overheating in the charging process.
Description
Technical Field
The present application relates to the field of battery power supply technologies, and in particular, to a battery protection circuit and an electronic device.
Background
With the development of electronic technology, lithium battery power supply is more and more widely used in electronic equipment. In the operation process of the lithium battery protection chip, when overcharge occurs, the power switch tube is disconnected, charging is not allowed, but a parasitic diode of the power switch tube is allowed to reserve a discharging path; even if the power switch tube is disconnected, the lithium battery can be discharged through the parasitic diode and cannot be charged. When over-discharge occurs, the power switch tube is also disconnected, discharge is not allowed, but a parasitic diode of the power switch tube keeps a charging path; even if the power switch tube is disconnected, the lithium battery can be charged through the parasitic diode and can not be discharged.
In order to meet the requirement of miniaturization of devices, the lithium battery protection chip and the power switch tube are often required to be packaged in the same wafer. However, when the lithium battery is in an over-discharge state, the charging needs to be realized through a parasitic diode of the power switch tube, and the charging overheating phenomenon is easy to occur.
Disclosure of Invention
Therefore, a need exists for a battery protection circuit and an electronic device to alleviate the problem that the lithium battery is prone to overheating during the over-discharge charging process.
A battery protection circuit comprises a delay circuit, an output conversion circuit, an over-discharge detection circuit, a drive control circuit, a power switch tube and a charger detection circuit, wherein a first input end of the over-discharge detection circuit inputs over-discharge reference voltage, a second input end of the over-discharge detection circuit inputs over-discharge detection voltage, and an output end of the over-discharge detection circuit is connected with the delay circuit and the output conversion circuit; the drive control circuit is connected with the delay circuit; the control end of the power switch tube is connected with the driving control circuit, the substrate of the power switch tube is connected with the driving control circuit, the first end of the power switch tube is connected with the negative end of the charger, and the second end of the power switch tube is connected with the negative end of the battery; the first input end of the charger detection circuit is connected with the second end of the power switch tube and the negative end of the battery, the second input end of the charger detection circuit is connected with the negative end of the charger, the positive end of the battery and the positive end of the charger, and the output end of the charger detection circuit is connected with the output conversion circuit;
the over-discharge detection circuit is used for outputting a level signal and transmitting the level signal to the drive control circuit through the delay circuit when the over-discharge of the battery is detected; the driving control circuit is used for controlling the power switch tube to be disconnected according to the level signal and controlling the substrate of the power switch tube to be connected with the negative end of the battery; the output conversion circuit is used for inverting the level signal output by the over-discharge detection circuit when a charger charges the battery through a parasitic diode of the power switch tube in an over-discharge state to obtain an inverted level signal; the drive control circuit is also used for controlling the conduction of the power switch tube according to the level signal which is transmitted by the delay circuit and is subjected to turnover.
According to the battery protection circuit, the over-discharge detection circuit detects and analyzes whether the battery is over-discharged or not according to the input over-discharge detection voltage and the over-discharge reference voltage, when the over-discharge is detected, the over-discharge detection circuit outputs a level signal which is transmitted to the driving control circuit through the delay circuit, the driving control circuit controls the power switch tube to be disconnected, and meanwhile, the substrate of the power switch tube is controlled to be selectively connected to the negative end of the battery, and a charging path is kept through the parasitic diode of the power switch tube. If the charger detection circuit detects that the charger is inserted, the battery is charged through the parasitic diode, and at the moment, because the negative end of the charger is lower than the negative end of the battery by a diode voltage drop voltage, a level signal output by the charger detection circuit is overturned, so that the output conversion circuit is controlled to operate.
Under the effect of output conversion circuit, the level signal of the output of overdischarge detection circuit will overturn, and after the level signal after overturning is transmitted to the drive control circuit, the drive control circuit can control the power switch tube to be conducted again, and at the moment, the power switch tube can be directly charged. And after the power switch tube is conducted for charging, the voltage of the negative end of the charger is larger than the detection threshold value of the charger, at the moment, the output level signal of the charger detection circuit is overturned again, and the level signal controls the output conversion circuit to stop running. Because the function of the output conversion circuit is stopped, the output level signal of the over-discharge detection circuit is changed into the level signal before the charger is inserted, the level signal is delayed for a period of time by the delay circuit and then is transmitted to the driving control circuit again, the driving control circuit is controlled to be disconnected, and the charging is carried out again by the path corresponding to the parasitic diode.
In the process, as long as the charger is inserted and the over-discharge detection voltage is lower than the over-discharge reference voltage, after the charging is carried out by the path corresponding to the parasitic diode again, the negative end of the charger is lower than the negative end of the battery by a diode drop voltage, and the power switch tube is controlled to be switched on and off in a circulating mode in the mode to carry out charging. According to the scheme, when the over-discharge battery is charged, the power switch tube can be controlled to be switched on and off alternately, and charging is carried out through different charging paths. And due to the action of the time delay circuit, when the power switch tube is switched on for charging and is switched off to be charged by a parasitic diode, the power switch tube is switched off after the time delay of tens of milliseconds to hundreds of milliseconds. This scheme can guarantee to be in power switch tube conduction state under the most time when charging the overdischarge battery and realize to can effectively reduce the time of charging through parasitic diode, the thermal production in greatly reduced overdischarge battery charging process avoids charging the production of overheated phenomenon in the charging process.
In one embodiment, the over-discharge detection voltage comprises an over-discharge detection voltage division and an over-discharge detection voltage division hysteresis voltage, the over-discharge detection circuit comprises a data selector and an over-discharge detection comparator, an over-discharge reference voltage is input to a first input end of the over-discharge detection comparator, the first input end and a second input end of the data selector respectively input the over-discharge detection voltage division and the over-discharge detection voltage division hysteresis voltage, a control end of the data selector is connected with an output end of the charger detection circuit, an output end of the data selector is connected with a second input end of the over-discharge detection comparator, and an output end of the over-discharge detection comparator is connected with the output conversion circuit and the delay circuit.
In one embodiment, the first input terminal of the over-discharge detection comparator is a positive input terminal, the second input terminal of the over-discharge detection comparator is a negative input terminal, the output conversion circuit includes a first switching device, a first end of the first switching device is connected to the output terminal of the over-discharge detection comparator, a second end of the first switching device is grounded, and a control end of the first switching device is connected to the output terminal of the charger detection circuit.
In one embodiment, the battery protection circuit further includes a trimming circuit, a first inverter, and an and gate device, an output terminal of the charger detection circuit is connected to the control terminal of the data selector and the first input terminal of the and gate device, the trimming circuit is connected to the second input terminal of the and gate device through the first inverter, and an output terminal of the and gate device is connected to the control terminal of the first switching device.
In one embodiment, a first input terminal of the over-discharge detection comparator is a negative input terminal, a second input terminal of the over-discharge detection comparator is a positive input terminal, the output conversion circuit includes a second switching device, a first end of the second switching device is connected to an output terminal of the over-discharge detection comparator, a second end of the second switching device is connected to the power supply, and a control end of the second switching device is connected to an output terminal of the charger detection circuit.
In one embodiment, the charger further comprises a trimming circuit, a second inverter, a third inverter and an or gate device, an output end of the charger detection circuit is connected with the second inverter and the data selector, the second inverter is connected with a first input end of the or gate device, the trimming circuit is connected with a second input end of the or gate device, an output end of the or gate device is connected with a control end of the second switch device, an output end of the over-discharge detection comparator is connected with a first end of the second switch device and the third inverter, and the third inverter is connected with the delay circuit.
In one embodiment, the charger detection circuit comprises a resistor, a current source and a charger detection comparator, wherein a first input end of the charger detection comparator is connected with a second end of the power switch tube and a negative end of the battery, a second input end of the charger detection comparator is connected with the current source and a first end of the resistor, a second end of the resistor is connected with a negative end of the charger, and the current source is connected with a positive end of the charger and a positive end of the battery.
In one embodiment, the current source includes a first current source and a second current source, the charger detection comparator includes a third switching device, a fourth inverter and a fifth inverter, the first current source is connected to the second current source, and a common terminal is connected to a positive terminal of the charger and a positive terminal of the battery, the first current source is connected to a first terminal of the third switching device, a second terminal of the third switching device is connected to a negative terminal of the charger through the resistor, a control terminal of the third switching device is connected to a control terminal of the fourth switching device and a first terminal of the third switching device, the second current source is connected to the fourth inverter and a first terminal of the fourth switching device, the fourth inverter is connected to the fifth inverter, the fifth inverter is connected to the output converting circuit, the second end of the fourth switching device is connected with the second end of the power switching tube and the negative end of the battery.
In one embodiment, the driving control circuit includes a logic driving circuit and a substrate selection circuit, the logic driving circuit is connected to the delay circuit, the logic driving circuit is connected to the control end of the power switch tube, the logic driving circuit is connected to the substrate selection circuit, and the substrate selection circuit is connected to the substrate of the power switch tube.
An electronic device comprises a battery and the battery protection circuit.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a battery protection circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a battery protection circuit according to another embodiment of the present application;
FIG. 3 is a schematic diagram of a battery protection circuit according to another embodiment of the present application;
FIG. 4 is a schematic diagram of a battery protection circuit according to yet another embodiment of the present application;
fig. 5 is a schematic diagram of a battery protection circuit according to another embodiment of the present application;
fig. 6 is a schematic diagram of a battery protection circuit according to another embodiment of the present application;
FIG. 7 is a schematic diagram of a battery protection circuit according to yet another embodiment of the present application;
FIG. 8 is a schematic diagram of a charger detection comparator according to an embodiment of the present application;
FIG. 9 is a schematic diagram of a battery protection circuit according to another embodiment of the present application;
FIG. 10 is a schematic diagram of a battery protection circuit according to another embodiment of the present application;
fig. 11 is a schematic diagram illustrating a work delay waveform of a battery protection circuit according to an embodiment of the present application.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1, a battery protection circuit includes a delay circuit 20, an output converter circuit 30, an over-discharge detection circuit 10, a driving control circuit 40, a power switch Q, and a charger detection circuit 50, wherein a first input terminal of the over-discharge detection circuit 10 inputs an over-discharge reference voltage, a second input terminal of the over-discharge detection circuit 10 inputs an over-discharge detection voltage, and an output terminal of the discharge detection circuit is connected to the delay circuit 20 and the output converter circuit 30; the drive control circuit 40 is connected with the delay circuit 20; the control end of the power switch tube Q is connected with the driving control circuit 40, the substrate of the power switch tube Q is connected with the driving control circuit 40, the first end of the power switch tube Q is connected with the negative end (VM) of the charger, and the second end of the power switch tube Q is connected with the negative end (GND) of the battery; a first input end of the charger detection circuit 50 is connected with a second end of the power switch tube Q and a negative end of the battery, a second input end of the charger detection circuit 50 is connected with a negative end of the charger, a positive end (VDD1) of the battery and a positive end (VDD2) of the charger, and an output end of the charger detection circuit 50 is connected with the output conversion circuit 30;
the over-discharge detection circuit 10 is used for outputting a level signal and transmitting the level signal to the drive control circuit 40 through the delay circuit 20 when detecting that the over-discharge of the battery occurs; the driving control circuit 40 is used for controlling the power switch tube Q to be disconnected according to the level signal and controlling the substrate of the power switch tube Q to be connected with the negative end of the battery; the output conversion circuit 30 is used for inverting the level signal output by the over-discharge detection circuit 10 to obtain an inverted level signal when the charger charges the battery through the parasitic diode of the power switch tube Q in the over-discharge state; the driving control circuit 40 is further configured to control the power switch Q to be turned on according to the inverted level signal transmitted by the delay circuit 20.
Specifically, the over-discharge detection circuit 10 is a circuit for detecting whether the battery has over-discharge, and it can output opposite level signals when the battery has over-discharge and does not have over-discharge. The over-discharge detection voltage is the battery discharge voltage obtained by real-time detection in the battery operation process. The over-discharge reference voltage is the over-discharge protection voltage, and if the over-discharge detection voltage is lower than the over-discharge reference voltage, the over-discharge of the battery is indicated; and when the over-discharge detection voltage is higher than the over-discharge reference voltage, the battery is not over-discharged. The charger detection circuit 50 is a detection circuit for detecting whether a charger is plugged or unplugged, and the charger detection circuit 50 can output different types of level signals according to the plugging or unplugging of the charger in the battery protection circuit. It is to be understood that the battery type referred to in the present application is not exclusive, and any secondary battery may be used as long as it can be charged and discharged, for example, a lithium battery.
When the over-discharge detection circuit 10 detects that the over-discharge occurs, the delay circuit 20 will start to operate and count time under the action of the output level signal of the over-discharge detection circuit 10. When the delay reaches the set time, the output level signal of the over-discharge detection circuit 10 is transmitted to the driving control circuit 40. When the over-discharge detection circuit 10 does not detect the occurrence of over-discharge, or when the level signal output after the over-discharge detection is detected is inverted under the action of the output conversion circuit 30, the delay circuit 20 does not turn on the delay function, and the level signal at this time is directly transmitted to the driving control circuit 40. The driving control circuit 40 has a driving control function, and can drive the power switch tube Q to be turned on or off according to the received level signal, and can select the substrate connection of the power switch tube Q, so that the substrate is connected to the negative terminal of the battery or the negative terminal of the charger.
In the battery protection circuit, the over-discharge detection circuit 10 detects and analyzes whether the battery is over-discharged according to the input over-discharge detection voltage and the over-discharge reference voltage, when the over-discharge is detected, the over-discharge detection circuit 10 outputs a level signal which is transmitted to the driving control circuit 40 through the delay circuit 20, the driving control circuit 40 controls the power switch tube Q to be disconnected, and simultaneously controls the substrate of the power switch tube Q to be selectively connected to the negative end of the battery, and a charging path is kept through the parasitic diode of the power switch tube Q. Subsequently, if the charger detection circuit 50 detects that a charger is inserted, the battery is charged through the parasitic diode, and at this time, because the negative terminal of the charger is lower than the negative terminal of the battery by a diode drop voltage, the level signal output by the charger detection circuit 50 is inverted, so as to control the operation of the output conversion circuit 30.
Under the action of the output conversion circuit 30, the level signal output by the over-discharge detection circuit 10 will be inverted, and after the inverted level signal is transmitted to the driving control circuit 40, the driving control circuit 40 will control the power switch Q to be turned on again, and at this time, the power switch Q can be directly charged. After the power switch Q is turned on, the voltage at the negative terminal of the charger will be greater than the charger detection threshold, and at this time, the output level signal of the charger detection circuit 50 will be inverted again, and the level signal will control the output conversion circuit 30 to stop operating. Since the function of the output conversion circuit 30 is stopped, the output level signal of the overdischarge detection circuit 10 becomes the level signal before the charger is inserted, the level signal is delayed for a period of time by the delay circuit 20 and then transmitted to the driving control circuit 40 again, and the driving control circuit 40 is controlled to be disconnected, and the charging is performed again by the path corresponding to the parasitic diode.
In the process, as long as the charger is inserted and the over-discharge detection voltage is lower than the over-discharge reference voltage, after the charging is carried out by the path corresponding to the parasitic diode again, the negative end of the charger is lower than the negative end of the battery by a diode drop voltage, and the power switch tube Q is controlled to be switched on and off in a circulating mode in the mode for charging. According to the scheme, when the over-discharge battery is charged, the power switch tube Q can be controlled to be switched on and off alternately, and charging is carried out through different charging paths. And due to the action of the delay circuit 20, when the power switch tube Q is switched on for charging and switched off for charging by a parasitic diode, the power switch tube Q is switched off only after a delay of tens of milliseconds to hundreds of milliseconds. This scheme can guarantee to be in power switch tube Q and realize under the on-state when charging to the overdischarge battery most time to can effectively reduce the time of charging through parasitic diode, the thermal production in greatly reduced overdischarge battery charging process avoids charging the production of overheated phenomenon in the charging process.
Referring to fig. 2, in an embodiment, the overdischarge detection voltage includes an overdischarge detection divided voltage and an overdischarge detection divided voltage hysteresis voltage, the overdischarge detection circuit 10 includes a data selector 12 and an overdischarge detection comparator 11, an overdischarge reference voltage is input to a first input terminal of the overdischarge detection comparator 11, the discharge detection divided voltage and the overdischarge detection divided voltage hysteresis voltage are respectively input to a first input terminal and a second input terminal of the data selector 12, a control terminal of the data selector 12 is connected to an output terminal of the charger detection circuit 50, an output terminal of the data selector 12 is connected to a second input terminal of the overdischarge detection comparator 11, and an output terminal of the overdischarge detection comparator 11 is connected to the output conversion circuit 30 and the delay circuit 20.
Specifically, the over-discharge detection divided voltage is also VDD _ DIV _ UV, and the over-discharge detection divided voltage hysteresis voltage is also VDD _ DIV _ uvhy. The two obtaining modes are not unique, and in one embodiment, a voltage sampling circuit or a voltage collector may be arranged at the output end of the battery for obtaining the voltage. In normal operation of the battery, that is, when no overdischarge phenomenon occurs, VDD _ DIV _ UV is greater than the overdischarge reference voltage (VREF _ UV), the output terminal of the overdischarge detection circuit 10 outputs one type of level signal, and when VDD _ DIV _ UV is less than the overdischarge reference voltage, it indicates that overdischarge occurs, and at this time, another type of level signal is output.
It can be understood that in the actual analysis process, whether overdischarge occurs is specifically adopted to detect partial voltage or overdischarge detects partial voltage hysteresis voltage, and the operation state of the protection circuit is different. When the battery protection circuit is overdischarged, if the insertion of the charger is not detected, the overdischarge recovery voltage and the overdischarge protection voltage are different, namely the overdischarge recovery voltage and the overdischarge protection voltage have certain hysteresis voltage. Therefore, in the embodiment, the data selector 12 is provided, and the data selector 12 is controlled to select according to the output of the charger detection circuit 50, and the over-discharge detection divided voltage or the over-discharge detection divided voltage hysteresis voltage is used according to the actual situation to perform the detection analysis of whether the over-discharge occurs. For example, when it is detected that a charger is inserted, the charger detection circuit 50 outputs a low level signal, and the data selector 12 selects, by the low level signal, such that the over-discharge detection voltage is input to the second input terminal of the over-discharge detection comparator 11.
Through this scheme, can be according to whether having the charger to insert, select the overdischarge to detect partial pressure or the overdischarge detects partial pressure hysteresis voltage and carry out the overdischarge detection analysis, avoid hysteresis voltage to the influence of overdischarge testing result, effectively improve the detection accuracy that the overdischarge detected.
It will be appreciated that the specific form of the first and second inputs of the over-discharge detection comparator 11 is not exclusive. For example, referring to fig. 3, in one embodiment, the first input terminal of the over-discharge detection comparator 11 is a positive input terminal, the second input terminal of the over-discharge detection comparator 11 is a negative input terminal, the output conversion circuit 30 includes a first switching device Q1, a first terminal of a first switching device Q1 is connected to the output terminal of the over-discharge detection comparator 11, a second terminal of the first switching device Q1 is grounded, and a control terminal of the first switching device Q1 is connected to the output terminal of the charger detection circuit 50.
Specifically, the scheme uses a first input terminal as a forward input terminal and a second input terminal as a reverse input terminal to explain in detail, the forward input terminal of the over-discharge detection comparator 11 is used for inputting an over-discharge reference voltage, and the reverse input terminal of the over-discharge detection comparator is used for inputting an over-discharge detection divided voltage or an over-discharge detection divided voltage hysteresis voltage. Therefore, in the scheme of this embodiment, when the over-discharge occurs, the over-discharge detection voltage division or the over-discharge detection voltage division hysteresis voltage is lower than the over-discharge reference voltage, and the over-discharge detection comparator 11 outputs a high level signal. When no over-discharge occurs, the over-discharge detection voltage division or the over-discharge detection voltage division hysteresis voltage is higher than the over-discharge reference voltage, and the over-discharge detection comparator 11 outputs a low level signal.
Correspondingly, in this embodiment, the output converter circuit 30 includes a first switching device Q1, a control terminal of the first switching device Q1 is connected to the charger detection circuit 50, and in the event of an over-discharge, the first switching device Q1 starts operating under the output of the charger detection circuit 50, and at this time, since the first switching device Q1 is grounded, the output level signal of the over-discharge detection comparator 11 will be pulled down from a high level to a low level, that is, will be inverted. Under the action of the inverted level signal (i.e. low level), the driving control circuit 40 controls the power switch Q to be turned on again, so as to perform a charging operation on the power switch Q path.
It is to be understood that the type of the first switching device Q1 is not exclusive, and in a more detailed embodiment, the first switching device Q1 is specifically a high-level conducting type switching device, such as an NMOS transistor.
Referring to fig. 4, in an embodiment, the battery protection circuit further includes a trimming circuit 60, a first inverter N1, and an and-gate device a, an output terminal of the charger detection circuit 50 is connected to the control terminal of the data selector 12 and a first input terminal of the and-gate device a, the trimming circuit 60 is connected to a second input terminal of the and-gate device a through the first inverter N1, and an output terminal of the and-gate device a is connected to a control terminal of the first switching device Q1.
Specifically, the trimming circuit 60 is a circuit for trimming the battery protection circuit so that the battery protection circuit is in different operation states, in the scheme of the embodiment, the trimming circuit 60 can trim the battery protection circuit to obtain two different over-discharge charging schemes, namely charging through the parasitic diode only and alternately charging through the parasitic diode and the power switch tube Q. Specifically, the over-discharge charging mode of the battery protection circuit is changed by the difference of the output level signals of the trimming circuit 60.
To explain by way of example that the output conversion circuit 30 includes the first switching device Q1, when the level signal output from the trimming circuit 60 to the and gate device a is zero, no matter what type of level signal the charger detection circuit 50 outputs, after the action of the and gate device a, the signal output to the first switching device Q1 always remains a low level signal. Under the action of the level signal, the first switching device Q1 is in an off state, and at this time, the pull-down function of the first switching device Q1 is disabled, and the output level signal of the over-discharge detection comparator 11 does not change. If the power transistor Q is in the overdischarge state, the overdischarge detection comparator 11 continuously outputs a high level signal, and under the action of the level signal, the power transistor Q is continuously in the off state, and at this time, the charging function is realized only through a parasitic diode of the power transistor Q.
When the level signal output by the trimming circuit 60 to the and-gate device a is 1, the output level signal of the charger detection circuit 50 may be transmitted to the first switching device Q1 through the and-gate device a, and the first switching device Q1 may be turned on and operated under the action of the output level signal of the charger detection circuit 50, so as to implement a pull-down function on the output level signal of the over-discharge detection comparator 11.
It should be noted that the specific type of the trimming circuit 60 is not exclusive, and in one embodiment, the trimming circuit 60 in which the fuse-blown output signal Trim _ Diode is a high-level type may be used. Correspondingly, in the solution of this embodiment, a first inverter N1 is further disposed between the trimming circuit 60 and the second input terminal of the and gate device a. When the fuse of the trimming circuit 60 is blown, the Trim _ Diode signal is high, the signal after passing through the first inverter N1 is low, the phase with the output phase of the charger detection circuit 50 is always 0, and the first switching device Q1 does not operate. When the trimming circuit 60 is not blown, the Trim _ Diode signal is low, the signal after passing through the first inverter N1 is high, and the output of the and gate device a is output from the charger detection circuit 50. If the output of the charger detection circuit 50 is at a high level, the first switching device Q1 will be enabled to operate, the output of the over-discharge detection comparator 11 will be pulled low, the over-discharge signal will be cleared, and finally the power switch Q will be turned on for charging.
According to the scheme of the embodiment, the battery protection circuit can be switched among different charging modes through the trimming circuit 60, the rechargeable battery protection circuit can be selected to operate in different charging modes according to actual requirements in the actual application process, the application range of the battery protection circuit can be effectively expanded, and the rechargeable battery protection circuit has high use convenience.
Referring to fig. 5, in an embodiment, the first input terminal of the over-discharge detection comparator 11 is a negative input terminal, the second input terminal of the over-discharge detection comparator 11 is a positive input terminal, the output conversion circuit 30 includes a second switching device Q2, a first terminal of the second switching device Q2 is connected to the output terminal of the over-discharge detection comparator 11, a second terminal of the second switching device Q2 is connected to the power supply, and a control terminal of the second switching device Q2 is connected to the output terminal of the charger detection circuit 50.
Specifically, in contrast to the above-described embodiment, the first input terminal of the over-discharge detection comparator 11 is a negative input terminal for inputting the over-discharge reference voltage, and the discharge detection divided voltage or the over-discharge detection divided voltage hysteresis voltage is input through the positive input terminal. Correspondingly, when the over-discharge occurs, the over-discharge detection voltage division or the over-discharge detection voltage division hysteresis voltage is lower than the over-discharge reference voltage, and the over-discharge detection comparator 11 outputs a low level signal. When no over-discharge occurs, the over-discharge detection voltage division or the hysteresis voltage of the over-discharge detection voltage division is higher than the over-discharge reference voltage, and the over-discharge detection comparator 11 outputs a high-level signal.
Accordingly, in the scheme of this embodiment, the output conversion circuit 30 includes a second switching device Q2, which implements output level inversion control of the over-discharge detection comparator 11 by pulling up the power supply. When the over-discharge occurs, the over-discharge detection comparator 11 outputs a low level signal, if the second switching device Q2 is turned on and operated under the action of the charger detection circuit 50, the level signal transmitted to the delay circuit 20 is converted into a high level signal due to the pull-up of the second switching device Q2, and then the on-state control of the power switching tube Q is realized by the level signal, and the detailed implementation manner is similar to that of the first switching device Q1 in the above embodiment, and is not described herein again.
It is to be understood that the specific type of the second switching device Q2 is not exclusive, and in an embodiment, the second switching device Q2 may be a low-level conducting type switching device, such as a PMOS transistor.
Referring to fig. 6, in an embodiment, the battery protection circuit further includes a trimming circuit 60, a second inverter N2, a third inverter N3 and an or-gate device H, an output terminal of the charger detection circuit 50 is connected to the second inverter N2 and the data selector 12, the second inverter N2 is connected to a first input terminal of the or-gate device H, the trimming circuit 60 is connected to a second input terminal of the or-gate device H, an output terminal of the or-gate device H is connected to a control terminal of the second switching device Q2, an output terminal of the over-discharge detection comparator 11 is connected to a first terminal of the second switching device Q2 and the third inverter N3, and the third inverter N3 is connected to the delay circuit 20.
Specifically, when the positive input terminal and the negative input terminal of the overdischarge detection comparator 11 are opposite to those of the above-described embodiment, the trimming circuit 60, the second inverter N2, and the or gate device H can also be used to implement the trimming function according to the embodiment. Namely, the battery protection circuit is modified to be charged only through the parasitic diode, and two different over-discharge charging schemes are alternatively charged through the parasitic diode and the power switch tube Q. Meanwhile, in the scheme, a phase inverter is further arranged between the over-discharge detection comparator 11 and the delay circuit 20, so that when the delay circuit 20 outputs a low level, the delay function can be started, and the level is transmitted to the driving control circuit 40 after a certain time, so that the battery protection circuit is ensured to perform charging operation by the power switch tube Q in a relatively long time period.
In the scheme of this embodiment, when the over-discharge occurs, the over-discharge detection comparator 11 outputs a low level, and if the battery is charged at this time, the charger detection circuit 50 outputs a high level, which is inverted by the second inverter N2 and then becomes a low level, and performs a logical or operation with the Trim circuit 60 outputting the Trim _ Diode signal. In the version where the power switch Q and the parasitic Diode alternately provide the charging path for charging, the Trim _ Diode signal is zero, and at this time, the Trim _ Diode signal performs a logical or function with the output level signal of the charger detection circuit 50, and the output level signal can control the second switch device Q2 to be turned on, so as to pull up the output of the over-discharge detection comparator 11 to a high level. In the version with only the parasitic Diode charging path, the Trim _ Diode signal is always at a high level, and after the Trim _ Diode signal is logically or-ed with the output signal of the charger detection comparator, the output level signal cannot control the second switching device Q2 to be turned on, the second switching device Q2 loses the pull-up function, and the output level signal of the over-discharge detection comparator 11 cannot be changed.
According to the scheme of the embodiment, the modification circuit 60 can realize the conversion of different charging modes of the battery protection circuit, the rechargeable battery protection circuit can be selected to operate in different charging modes according to actual requirements in the actual application process, the application range of the battery protection circuit can be effectively enlarged, and the rechargeable battery protection circuit has high use convenience.
Referring to fig. 7, in one embodiment, the charger detection circuit 50 includes a resistor R, a current source 52 and a charger detection comparator 51, a first input terminal of the charger detection comparator 51 is connected to the second terminal of the power switch Q and the negative terminal of the battery, a second input terminal of the charger detection comparator 51 is connected to the current source 52 and the first terminal of the resistor R, the second terminal of the resistor R is connected to the negative terminal of the charger, and the current source 52 is connected to the positive terminal of the charger and the positive terminal of the battery.
Specifically, according to the scheme of this embodiment, the second input terminal of the charger detection comparator 51 is connected to the positive terminal of the battery and the positive terminal of the charger through the current source 52, when it is detected that the charger is plugged in, the second terminal voltage of the charger detection comparator 51 is higher than the first terminal voltage, taking the first input terminal of the charger detection comparator 51 as a forward input terminal and the second input terminal as a reverse input terminal as an example, at this time, the charger detection comparator 51 will output a low level signal, and at this time, if over-discharge occurs, the output conversion circuit 30 will not be turned on to operate. Therefore, under the action of the level signal output by the over-discharge detection circuit 10, the driving control circuit 40 controls the power switch tube Q to be turned off, and the substrate of the power switch tube Q is controlled to be connected with the driving control circuit 40, so that the battery protection circuit keeps a charging path through the parasitic diode of the power switch tube Q.
When the charging of the parasitic diode charging path is started, the negative terminal of the charger is lower than the negative terminal of the battery by a diode drop voltage (about-0.7V), and the output level signal of the charger detection comparator 51 is inverted to a high level signal because the second input terminal of the charger detection comparator 51 is connected to the negative terminal of the charger through the resistor R. Under the action of the high level signal, the output conversion circuit 30 starts to operate, and the level signal output by the over-discharge detection circuit 10 is inverted, so that the power switch tube Q is turned on, and the charging operation is performed on the path of the power switch tube Q.
When the power switch tube Q path is charged and turned on, the voltage at the negative terminal of the charger will change to the product of the charging current and the conduction impedance of the power tube, and under the action of the voltage, the level signal output by the charger detection comparator 51 is inverted into a low level signal, and the output conversion circuit 30 stops operating. At this time, the level signal output by the overdischarge detection circuit 10 is delayed by the delay circuit 20, transmitted to the driving control circuit 40, and the power switch tube Q is switched off again to charge the parasitic diode, and this is repeated until the overdischarge detection voltage rises to be greater than or equal to the overdischarge reference voltage, and the overdischarge charging is finished.
It should be noted that the specific type of the charger detection comparator 51 is not exclusive, and may be a comparator in a common source structure or a comparator in a common gate structure, and different choices may be made in combination with the actual comparator. For example, in one embodiment, which can be explained in detail by taking a common gate structure as an example with reference to fig. 8, the current source 52 includes a first current source 521 and a second current source 522, the charger detection comparator 51 includes a third switching device Q3, a fourth switching device Q4, a fourth inverter N4 and a fifth inverter N5, the first current source 521 is connected to the second current source 522, and a common terminal is connected to the positive terminal of the charger and the positive terminal of the battery, the first current source 521 is connected to a first terminal of the third switching device Q3, a second terminal of the third switching device Q3 is connected to the negative terminal of the charger through a resistor R, a control terminal of the third switching device Q3 is connected to a control terminal of the fourth switching device Q4 and a first terminal of the third switching device Q3, the second current source 522 is connected to first terminals of the fourth inverter N4 and the fourth switching device Q4, the second inverter is connected to the fifth inverter N5, the fifth inverter N5 is connected to the output converting circuit 30, a second terminal of the fourth switching device Q4 is connected to the second terminal of the power switch Q and the negative terminal of the battery.
Referring to fig. 9, in an embodiment, the driving control circuit 40 includes a logic driving circuit 41 and a substrate selection circuit 42, the logic driving circuit 41 is connected to the delay circuit 20, the logic driving circuit 41 is connected to the control terminal of the power switch Q, the logic driving circuit 41 is connected to the substrate selection circuit 42, and the substrate selection circuit 42 is connected to the substrate of the power switch Q.
Specifically, in the scheme of this embodiment, the driving control circuit 40 specifically includes two parts, namely a logic driving part and a substrate selecting part, the logic driving circuit 41 outputs a corresponding control logic to the power switch Q according to the output level signal of the over-discharge detection circuit 10 to control the on/off of the power switch Q, and the substrate selecting circuit 42 controls the substrate of the power switch Q to be connected to the negative terminal of the charger or the negative terminal of the power supply according to the output logic of the logic driving circuit 41.
In order to facilitate understanding of the technical solutions of the present application, the following description is made with reference to more detailed embodiments. The over-discharge detection circuit 10 includes a data selector 12 and an over-discharge detection comparator 11, a first input end of the over-discharge detection comparator 11 is a forward input end, a second input end is a reverse input end, the output conversion circuit 30 includes a first switching device Q1, and is specifically an NMOS transistor, the charger detection circuit 50 includes a resistor R, a current source 52, and a charger detection comparator 51, the driving control circuit 40 includes a logic driving circuit 41 and a substrate selection circuit 42, the trimming circuit 60 is connected to a second input end of the and gate device a through a first inverter N1, a level signal output by the trimming circuit 60 is a low level signal, and is converted into a high level signal after passing through a first inverter N1, so that the battery protection circuit is trimmed into a power switching transistor Q path and a parasitic diode path alternate charging form, and a specific circuit diagram can refer to fig. 10.
Firstly, when the over-discharge detection voltage (specifically taking over-discharge detection voltage division as an example) is greater than the over-discharge reference voltage, the over-discharge detection comparator 11 outputs a low-level signal, and is not in an over-discharge state at this time; when the over-discharge detection voltage is smaller than the over-discharge reference voltage, the over-discharge detection comparator 11 outputs a high level signal, which is in an over-discharge state at this time.
In the over-discharge state, the high level signal output by the over-discharge detection comparator 11 is delayed by the delay circuit 20 and then transmitted to the logic driving circuit 41, and under the action of the logic driving circuit 41, the power switch Q is in the off state, and under the output control of the logic driving circuit 41, the substrate selection circuit 42 connects the substrate selection of the power switch Q with the negative terminal of the charger, so as to maintain the existence of the parasitic diode charging path. In this process, if the insertion of the charger is not detected, the charger detection comparator 51 outputs a low level, and the first switching device Q1 does not operate, that is, the output terminal of the over-discharge detection comparator 11 does not pull down, and the power switching tube Q will be continuously controlled to be in the off state.
When the insertion of the charger is detected, the battery protection circuit will start to charge with the parasitic diode path that was previously reserved, in the process, because the voltage of the negative terminal of the charger has a voltage difference of one diode drop with respect to the negative terminal of the battery. At this time, the voltage at the first input terminal of the charger detection comparator 51 is higher than that at the second input terminal, and the output level of the charger detection comparator 51 is inverted and becomes a high level signal. Under the action of the high level signal, the first switching device Q1 is turned on to operate, the output voltage of the overdischarge detection comparator 11 is pulled down to a low level, the low level signal is directly transmitted to the logic driving circuit 41 through the delay circuit 20 (at this time, there is no delay), and finally the power switching tube Q is controlled to enter a conducting state, and at this time, charging is realized through the power switching tube Q path.
Due to the conduction of the power switch Q, the voltage at the negative terminal of the charger changes, specifically, the product of the negative charging current and the conduction impedance of the power switch Q, and under the action of the voltage, the charger detection comparator 51 outputs a low level signal again. After receiving the low level signal, the control terminal of the first switching device Q1 will enter an off state, at which the pull-down function is disabled, and the level signal output to the delay circuit 20 by the overdischarge detection comparator 11 changes into a high level signal. At this time, the delay circuit 20 is turned on, and after a delay of several tens to several hundreds of milliseconds, it is transmitted to the logic driving circuit 41, and the power switch Q is turned off again by the logic driving circuit 41, and is charged by the parasitic diode path.
Based on the above analysis, when charging is performed through the parasitic diode path, the output level signal of the charger detection comparator 51 is inverted, and the first switching device Q1 is controlled to turn on the pull-down function again. As long as the charger is inserted, the charging is carried out in a circulating and reciprocating mode until the over-discharge detection voltage is larger than the over-discharge reference voltage, and the charging operation is completed. Referring to fig. 11, the overdischarge protection delay Tuv is several tens to several hundreds of milliseconds, and the charger detection comparator 51 delay plus the logic and driving circuit delay plus the power transistor turn-on delay is on the order of several tens of microseconds (dashed box portion in the figure). Therefore, when the overdischarge battery is charged, the power switch tube Q is turned on most of the time, and is turned off only for a very small period of time, and the charging is performed through the parasitic diode path. Therefore, the power consumption of the parasitic diode when the power switch tube Q is turned off can be almost ignored, and the overheating phenomenon caused by the parasitic diode in the charging process can be avoided. Meanwhile, the scheme can also avoid the problems that the battery cannot be charged in certain applications and the trickle/constant current charging is switched back and forth in the charging process.
An electronic device comprises a battery and the battery protection circuit.
Specifically, as shown in the above embodiments and the accompanying drawings, the overdischarge detection circuit 10 performs detection and analysis on whether the battery is overdischarged according to the input overdischarge detection voltage and the overdischarge reference voltage, when the overdischarge detection circuit 10 detects that the battery is overdischarged, the level signal is output by the overdischarge detection circuit 10 and transmitted to the driving control circuit 40 through the delay circuit 20, the driving control circuit 40 controls the power switch Q to be turned off, and at the same time controls the substrate of the power switch Q to be selectively connected to the negative terminal of the battery, and the charging path is maintained through the parasitic diode of the power switch Q. Subsequently, if the charger detection circuit 50 detects that a charger is inserted, the battery is charged through the parasitic diode, and at this time, because the negative terminal of the charger is lower than the negative terminal of the battery by a diode drop voltage, the level signal output by the charger detection circuit 50 is inverted, so as to control the operation of the output conversion circuit 30.
Under the action of the output conversion circuit 30, the level signal output by the over-discharge detection circuit 10 will be inverted, and after the inverted level signal is transmitted to the driving control circuit 40, the driving control circuit 40 will control the power switch tube Q to be turned on again, and at this time, the power switch tube Q can be directly charged. After the power switch Q is turned on, the voltage at the negative terminal of the charger will be greater than the charger detection threshold, and at this time, the output level signal of the charger detection circuit 50 will be inverted again, and the level signal will control the output conversion circuit 30 to stop operating. Since the function of the output conversion circuit 30 is stopped, the output level signal of the overdischarge detection circuit 10 becomes the level signal before the charger is inserted, the level signal is delayed for a period of time by the delay circuit 20 and then transmitted to the driving control circuit 40 again, and the driving control circuit 40 is controlled to be disconnected, and the charging is performed again by the path corresponding to the parasitic diode.
In the process, as long as the charger is inserted and the over-discharge detection voltage is lower than the over-discharge reference voltage, after the charging is carried out by the path corresponding to the parasitic diode again, the negative end of the charger is lower than the negative end of the battery by a diode drop voltage, and the power switch tube Q is controlled to be switched on and off in a circulating mode in the mode for charging. According to the scheme, when the over-discharge battery is charged, the power switch tube Q can be controlled to be switched on and off alternately, and charging is carried out through different charging paths. And due to the action of the delay circuit 20, when the power switch tube Q is switched on for charging and switched off for charging by a parasitic diode, the power switch tube Q is switched off only after a delay of tens of milliseconds to hundreds of milliseconds. This scheme can guarantee to be in power switch tube Q and realize under the on-state when charging to the overdischarge battery most time to can effectively reduce the time of charging through parasitic diode, the thermal production in greatly reduced overdischarge battery charging process avoids charging in the charging process and the production of overheated phenomenon, effectively improves electronic equipment's the reliability of charging.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A battery protection circuit, comprising:
a delay circuit;
an output conversion circuit;
the first input end of the over-discharge detection circuit inputs over-discharge reference voltage, the second input end of the over-discharge detection circuit inputs over-discharge detection voltage, and the output end of the over-discharge detection circuit is connected with the delay circuit and the output conversion circuit;
the drive control circuit is connected with the delay circuit;
the control end of the power switch tube is connected with the driving control circuit, the substrate of the power switch tube is connected with the driving control circuit, the first end of the power switch tube is connected with the negative end of the charger, and the second end of the power switch tube is connected with the negative end of the battery;
a first input end of the charger detection circuit is connected with the second end of the power switch tube and the negative end of the battery, a second input end of the charger detection circuit is connected with the negative end of the charger, the positive end of the battery and the positive end of the charger, and an output end of the charger detection circuit is connected with the output conversion circuit;
the over-discharge detection circuit is used for outputting a level signal and transmitting the level signal to the drive control circuit through the delay circuit when the over-discharge of the battery is detected; the driving control circuit is used for controlling the power switch tube to be disconnected according to the level signal and controlling the substrate of the power switch tube to be connected with the negative end of the battery; the output conversion circuit is used for inverting the level signal output by the over-discharge detection circuit when a charger charges the battery through a parasitic diode of the power switch tube in an over-discharge state to obtain an inverted level signal; the drive control circuit is also used for controlling the conduction of the power switch tube according to the level signal which is transmitted by the delay circuit and is subjected to turnover.
2. The battery protection circuit according to claim 1, wherein the over-discharge detection voltage comprises an over-discharge detection divided voltage and an over-discharge detection divided voltage hysteresis voltage, the over-discharge detection circuit comprises a data selector and an over-discharge detection comparator, an over-discharge reference voltage is input to a first input terminal of the over-discharge detection comparator, the over-discharge detection divided voltage and the over-discharge detection divided voltage hysteresis voltage are respectively input to a first input terminal and a second input terminal of the data selector, a control terminal of the data selector is connected to an output terminal of the charger detection circuit, an output terminal of the data selector is connected to a second input terminal of the over-discharge detection comparator, and an output terminal of the over-discharge detection comparator is connected to the output conversion circuit and the delay circuit.
3. The battery protection circuit of claim 2, wherein the first input terminal of the over-discharge detection comparator is a positive input terminal, the second input terminal of the over-discharge detection comparator is a negative input terminal, the output conversion circuit comprises a first switching device, a first terminal of the first switching device is connected to the output terminal of the over-discharge detection comparator, a second terminal of the first switching device is grounded, and a control terminal of the first switching device is connected to the output terminal of the charger detection circuit.
4. The battery protection circuit of claim 3, further comprising a trimming circuit, a first inverter and an AND gate device, wherein an output terminal of the charger detection circuit is connected to the control terminal of the data selector and the first input terminal of the AND gate device, the trimming circuit is connected to the second input terminal of the AND gate device through the first inverter, and an output terminal of the AND gate device is connected to the control terminal of the first switching device.
5. The battery protection circuit of claim 2, wherein the first input terminal of the over-discharge detection comparator is a negative input terminal, the second input terminal of the over-discharge detection comparator is a positive input terminal, the output conversion circuit comprises a second switching device, a first terminal of the second switching device is connected to the output terminal of the over-discharge detection comparator, a second terminal of the second switching device is connected to the power supply, and a control terminal of the second switching device is connected to the output terminal of the charger detection circuit.
6. The battery protection circuit of claim 5, further comprising a trimming circuit, a second inverter, a third inverter and an OR gate device, wherein an output terminal of the charger detection circuit is connected to the second inverter and the data selector, the second inverter is connected to a first input terminal of the OR gate device, the trimming circuit is connected to a second input terminal of the OR gate device, an output terminal of the OR gate device is connected to a control terminal of the second switching device, an output terminal of the over-discharge detection comparator is connected to a first terminal of the second switching device and the third inverter, and the third inverter is connected to the delay circuit.
7. The battery protection circuit according to any of claims 1-6, wherein the charger detection circuit comprises a resistor, a current source, and a charger detection comparator, wherein a first input of the charger detection comparator is connected to the second terminal of the power switch and the negative terminal of the battery, a second input of the charger detection comparator is connected to the current source and the first terminal of the resistor, a second terminal of the resistor is connected to the negative terminal of the charger, and the current source is connected to the positive terminal of the charger and the positive terminal of the battery.
8. The battery protection circuit of claim 7, wherein the current source comprises a first current source and a second current source, the charger detection comparator comprises a third switching device, a fourth inverter, and a fifth inverter, the first current source is connected to the second current source, and a common terminal is connected to the positive terminal of the charger and the positive terminal of the battery, the first current source is connected to the first terminal of the third switching device, the second terminal of the third switching device is connected to the negative terminal of the charger through the resistor, the control terminal of the third switching device is connected to the control terminal of the fourth switching device and the first terminal of the third switching device, the second current source is connected to the fourth inverter and the first terminal of the fourth switching device, and the fourth inverter is connected to the fifth inverter, the fifth inverter is connected with the output conversion circuit, and the second end of the fourth switching device is connected with the second end of the power switch tube and the negative end of the battery.
9. The battery protection circuit according to claim 1, wherein the driving control circuit comprises a logic driving circuit and a substrate selection circuit, the logic driving circuit is connected to the delay circuit, the logic driving circuit is connected to the control terminal of the power switch tube, the logic driving circuit is connected to the substrate selection circuit, and the substrate selection circuit is connected to the substrate of the power switch tube.
10. An electronic device comprising a battery and the battery protection circuit of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210665523.2A CN115051433A (en) | 2022-06-14 | 2022-06-14 | Battery protection circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210665523.2A CN115051433A (en) | 2022-06-14 | 2022-06-14 | Battery protection circuit and electronic equipment |
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| CN115051433A true CN115051433A (en) | 2022-09-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117394508A (en) * | 2023-12-13 | 2024-01-12 | 成都利普芯微电子有限公司 | Battery protection packaging body |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117394508A (en) * | 2023-12-13 | 2024-01-12 | 成都利普芯微电子有限公司 | Battery protection packaging body |
| CN117394508B (en) * | 2023-12-13 | 2024-04-02 | 成都利普芯微电子有限公司 | Battery protection packaging body |
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Address after: 518101 District D and E, 7th Floor, Building 3, Tingwei Industrial Park, 6 Liufang Road, Xin'an Street, Baoan District, Shenzhen City, Guangdong Province Applicant after: Shenzhen Aixiesheng Technology Co.,Ltd. Address before: 518101 District D and E, 7th Floor, Building 3, Tingwei Industrial Park, 6 Liufang Road, Xin'an Street, Baoan District, Shenzhen City, Guangdong Province Applicant before: SHENZHEN AIXIESHENG TECHNOLOGY Co.,Ltd. |