CN112332498A - Multi-battery charging and discharging management circuit for switch type voltage stabilizer - Google Patents
Multi-battery charging and discharging management circuit for switch type voltage stabilizer Download PDFInfo
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- CN112332498A CN112332498A CN202011329175.9A CN202011329175A CN112332498A CN 112332498 A CN112332498 A CN 112332498A CN 202011329175 A CN202011329175 A CN 202011329175A CN 112332498 A CN112332498 A CN 112332498A
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- 239000003381 stabilizer Substances 0.000 title claims abstract description 16
- 238000007599 discharging Methods 0.000 title abstract description 18
- 238000005070 sampling Methods 0.000 claims abstract description 52
- 239000000758 substrate Substances 0.000 claims abstract description 37
- 238000003079 width control Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 8
- 229910052744 lithium Inorganic materials 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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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
- H02J7/00304—Overcurrent 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
- H02J7/00308—Overvoltage 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
- H02J7/0068—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
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1588—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load comprising at least one synchronous rectifier element
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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)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a multi-battery charging and discharging management circuit for a switch type voltage stabilizer, which comprises a switch type voltage stabilizer, a power tube PM1, a sampling resistor RS, a sampling amplifier and a PM1 driving protection circuit, wherein the output end of the switch type voltage stabilizer is respectively connected with VOUT, the drain electrode of the power tube PM1 and the input end of the PM1 driving protection circuit, the source electrode of the power tube PM1 is connected with one end of the sampling resistor RS, the other end of the sampling resistor RS is connected with a plurality of batteries, the grid electrode of the power tube PM1 is connected with the output end of the PM1 driving protection circuit, the sampling amplifier is connected in parallel at two ends of the sampling resistor RS, the output end of the sampling amplifier is respectively connected with the acquisition end of the switch type voltage stabilizer and the acquisition end of the PM1 driving protection circuit, and the PM1 is connected with a substrate selection. The invention has the advantages of high energy conversion efficiency and OUT overvoltage, short-circuit protection and charging current limiting functions.
Description
Technical Field
The invention relates to the technical field of voltage stabilizer manufacturing, in particular to a multi-battery charging and discharging management circuit for a switch type voltage stabilizer.
Background
Portable electronic devices (e.g., mobile phones, tablet computers, mobile power sources, bluetooth speakers, etc.) are generally not powered by lithium batteries. The lithium battery may power other chips or circuits in the electronic device. Therefore, a charging circuit and a battery discharging circuit are generally arranged in the portable device. Even in complex devices there may be a combined charging and discharging path management circuit.
As shown in fig. 1, the input power supply terminal VIN of the portable device usually supplies power to the battery 12 through the charge management chip 11, after the battery stores energy, the battery supplies power to other chips or systems 14 of the portable device through the discharge management 13 circuit, and the output terminal of the discharge management 14 may also be used as the output terminal VSYS of the portable device.
When the input power at the input terminal VIN is greater than the output power at the output terminal VSYS, the excess energy will charge the under-charged battery 12. When the power provided by the input terminal VIN cannot satisfy the power required by the output terminal VSYS, the battery terminal VBAT will supplement the energy to discharge the output terminal VSYS.
The traditional portable application input end voltage is USB power supply 5V voltage, and the VBAT end battery is a single lithium battery and is full of 4.2V voltage. Output port VSYS typically does not exceed 5V. Thus for a small capacity battery, the charging configuration is typically a linear charging mode, 5V to 4.2V, linear maximum charging current 1A. For the application with large battery capacity, a voltage reduction type switch charging mode of converting 5V to 4.2V is adopted. The path of battery discharge is typically a buck or buck-boost switching regulator.
However, as the demand for the battery capacity of portable devices increases, the charging time under the condition of the original charging current also increases proportionally with the battery capacity. If the connection mode of large battery capacity is changed from parallel connection to series connection, the charging time is greatly shortened.
With the progress of science and technology, the charging power is gradually increased, and the charging input voltage is also continuously increased. In recent years, the newly popular type-C interface will gradually replace the traditional USB or 5V adapter output of 5V output by virtue of the high-power characteristic. The input voltage range of the type-C interface is 3.6V-20V. The charging interface with wide input voltage variation is not applicable to charging in a traditional linear or simple voltage reduction mode. Especially, the traditional structure is not suitable for type-C input, and the charging and discharging management of a plurality of lithium batteries connected in series is not suitable any more.
Aiming at the problems, a multi-battery charging and discharging management circuit for a switch type voltage stabilizer is designed.
Disclosure of Invention
The invention aims to provide a multi-battery charging and discharging management circuit for a switching type voltage stabilizer, which has the advantages of high energy conversion efficiency, VOUT overvoltage, short-circuit protection and charging current limitation, and solves the problem that the charging and discharging management of a plurality of series lithium batteries is not applicable to type-C input.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a multisection battery charge-discharge management circuit for on-off regulator, includes on-off regulator, power tube PM1, sampling resistor RS, sampling amplifier, PM1 drive protection circuit, VOUT, power tube PM 1's drain electrode, PM1 drive protection circuit's input are connected respectively to on-off regulator's output, power tube PM 1's source electrode is connected with sampling resistor RS's one end, multisection battery is connected to sampling resistor RS's the other end, power tube PM 1's grid is connected with PM1 drive protection circuit output, sampling amplifier connects in parallel sampling resistor RS's both ends, sampling amplifier's output is connected with on-off regulator's collection end, PM1 drive protection circuit's collection end respectively, power tube PM1 is connected with substrate selection circuit.
Further, the substrate selection circuit comprises a comparator used for voltage comparison and two PMOS tubes PM2 and PM3, sources of the PM2 and PM3 are connected with the substrate and are connected with the substrate of the power tube PM1, a drain of the PM2 is connected with a drain of the power tube PM1, a drain of the PM3 is connected with a source of the power tube PM1 and leads out V1, a positive input end of the comparator is connected with VOUT, a negative input end of the comparator is connected with V1, a positive output end of the comparator is connected with a grid of the PM3, and a negative output end of the comparator is connected with a grid of the PM 2.
Further, the substrate selection circuit is used for substrate high potential selection, and the substrate which selects out PM2 and PM3 is connected with the higher voltage of VOUT and V1.
Further, the topology of the switching regulator includes, step up, step down, step up and step down.
Furthermore, the voltage reduction topological structure comprises a PWM pulse width control circuit, a switching power tube, a rectification power tube and an inductor, wherein the control end of the PWM pulse width control circuit is connected with the output end of the sampling amplifier, the output end of the PWM pulse width control circuit is connected with a power tube driver, the power tube driver is connected with the switching power tube and the rectification power tube, the switching power tube is connected with VIN, and the rectification power tube is connected with VOUT.
Compared with the prior art, the invention has the beneficial effects that:
1. the device has the functions of high energy conversion efficiency, VOUT overvoltage protection, short-circuit protection and charging current limitation; when the input power at VIN terminal is less than the power needed by other system circuits, the PM1 driving protection circuit pulls the grid of the PMOS tube PM1 low, and opens the PM1 tube, so that the plurality of batteries can automatically supply power to other system circuits. When the input power of the VIN end is larger than the power required by other system circuits and the voltage of a plurality of batteries is lower than the recharging voltage of the plurality of batteries, the VIN input charges the batteries through the switching regulator and the PMOS pipe PM 1; because the charging and discharging efficiency of the plurality of batteries is high, the charging and discharging control system can effectively solve the problem of energy balance of supply and demand of each level of system in the large-capacity battery portable equipment; the conversion efficiency of energy is greatly improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a diagram illustrating a conventional portable device for managing charging and discharging of lithium batteries;
FIG. 2 is a circuit diagram of a multi-cell battery charge/discharge management circuit for a switching regulator according to the present invention;
fig. 3 is a circuit diagram of a multi-battery charge-discharge management circuit for a switching regulator of a buck switching power supply.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, a multisection battery charge-discharge management circuit for switching mode stabiliser, including switching mode stabiliser, power tube PM1, sampling resistor RS, sampling amplifier, PM1 drive protection circuit, VOUT, power tube PM 1's drain electrode, PM1 drive protection circuit's input are connected respectively to switching mode stabiliser's output, power tube PM 1's source electrode is connected with sampling resistor RS's one end, multisection battery is connected to sampling resistor RS's the other end, power tube PM 1's grid is connected with PM1 drive protection circuit output, sampling amplifier connects in parallel sampling resistor RS's both ends, sampling amplifier's output is connected with switching mode stabiliser's collection end, PM1 drive protection circuit's collection end respectively, power tube PM1 is connected with substrate selection circuit.
The substrate selection circuit comprises a comparator used for voltage comparison and two PMOS tubes PM2 and PM3, the sources of the PM2 and PM3 are connected with the substrate and are connected with the substrate of the power tube PM1, the drain of the PM2 is connected with the drain of the power tube PM1, the drain of the PM3 is connected with the source of the power tube PM1 and leads V1 out, the positive input end of the comparator is connected with VOUT, the negative input end of the comparator is connected with V1, the positive output end of the comparator is connected with the grid of the PM3, and the negative output end of the comparator is connected with the grid of the PM 2.
The substrate selection circuit is used for substrate high potential selection, and the substrate of the selected PM2 and PM3 is connected with the higher voltage of VOUT and V1.
The topological structure of the switch type voltage stabilizer comprises the steps of boosting, reducing voltage and boosting and reducing voltage.
The step-down topological structure comprises a PWM pulse width control circuit, a switching power tube, a rectification power tube and an inductor, wherein the control end of the PWM pulse width control circuit is connected with the output end of a sampling amplifier, the output end of the PWM pulse width control circuit is connected with a power tube driver, the power tube driver is connected with the switching power tube and the rectification power tube, the switching power tube is connected with VIN, and the rectification power tube is connected with VOUT.
From the above, where the PWM pulse width modulation control 111 is connected to the output of the sampling amplifier 103, the output of different duty ratios is achieved by sampling the magnitude of the charging current. The output switching signals with different duty ratios are respectively connected to the grid electrode of the switching NMOS tube NM1113 and the grid electrode of the synchronous rectification NMOS tube 114 through the power tube driving circuit 112, and the phases of the two grid signals are opposite. The drain of NM1 is connected to the input terminal VIN, the source is connected to the drain of NM2 and one end of the inductor, and the source of NM2 is connected to ground. The capacitor C1116 has one end connected to the other end of the inductor, i.e., VOUT, and the other end connected to ground.
The output of the two power tubes outputs energy to VOUT through an inductor. The inductor L1 and the capacitor C1 are energy storage components. The output switch-type periodic energy of the two power tubes is converted into constant voltage and current output through an inductor and a capacitor.
The output of the switching regulator is composed of two parts, one part is used for supplying power to other chips or circuits of the whole equipment system. The other part is used for charging a plurality of battery cells.
The PM1 is a charging path for controlling the output of the switching regulator to the plurality of batteries, and is also a control path for discharging the lithium battery to other system circuits.
And judging whether the battery is in a charging state or a discharging state, and automatically detecting by the system. First, when the input power is larger than the power required by other system circuits and the battery is in a full-charged state, the gate driving of the PM1 determines that the other system circuits provide voltage, charges the battery again, and instructs the battery to be in the full-charged state, and then stops charging. Secondly, when the input power is less than the power required by other systems, the input is directly not plugged in at the limit. At this time, VOUT voltage is lower than VBAT voltage. Multiple batteries may provide power to other systems through PM 1.
The drive protection circuit for PM1, which is connected to the gate of PM1, detects both VOUT and VBAT signals and is also controlled by the output of the sampling amplifier.
One end of a sampling resistor RS is connected to the negative end of the sampling amplifier, the negative end of the sampling amplifier is connected to V1, the other end of the RS is connected to the positive end VBAT of the sampling amplifier, the positive end of the sampling amplifier is connected to VBAT, and the output of the sampling amplifier is connected to the control protection circuit of PM1 and the control end of the switching regulator. For controlling the current from VIN to VOUT and the positive and negative current values between VOUT and VBAT.
PM1 drives the protection circuit, RS and sampling amplifier constitute the current of the whole charge-discharge path together and control. The PM1 driving protection circuit is connected with the VBAT to mainly detect the VBAT voltage in real time, the sampling amplifier detects the charging and discharging current, and the sampled signal is amplified by the amplifier to control the grid electrode of the PM 1. The PM1 is controlled by determining whether the battery is in a trickle state, a constant current and a constant voltage, etc., to control the current for charging the battery.
Meanwhile, the PM1 drive control protection circuit can control the discharge current and protect VOUT voltage from being damaged due to the fact that the set voltage is exceeded during power supply.
When the system does not require battery power, the path PM1 is closed and the gate of PM1 is pulled back to the higher potential of both V1 and VOUT. And at the same time, to prevent the PM1 substrate and the parasitic diodes of the source and drain from turning on. A substrate select circuit is required to place the substrate of PM1 at a higher potential for both VOUT and V1.
A particular implementation is through a substrate selection circuit.
The substrate selection circuit of PM1 includes a voltage comparator and two PMOS transistors PM2, PM 3. The positive input end of the comparator is connected with VOUT, the negative output end of the comparator is connected with V1, the positive output end of the comparator is connected with the grid of PM3, the negative output end of the comparator is connected with the grid of PM2, and the source electrode and the substrate of the PM2 are connected with the source electrode and the substrate of the PM 3. The drain of PM2 is connected to VOUT, and the drain of PM1 is connected to V1.
When the VOUT voltage is higher than the V1 voltage, the comparator will place the gate of PM2 low and the gate of PM3 high. Thus, PM2 is on and PM3 is off. The substrate of PM1 is now connected to the drain of VOUT, i.e., PM 1. Since VOUT voltage is higher than V1 voltage, the substrate-to-source substrate diode of PM1 is in reverse bias.
Conversely, when the VOUT voltage is lower than the V1 voltage, the comparator will place the gate of PM2 high and the gate of PM3 low. Thus, PM2 is turned off and PM3 is turned on. The substrate of PM1 is now connected to the source of V1, i.e., PM 1. Since VOUT is lower than V1, the substrate and drain forming substrate diodes of PM1 are also in reverse bias.
Thus, the channel of leakage current of VBAT to other system circuits and even switching regulators is completely closed. The quiescent current power consumption of VBAT is reduced, and the endurance capacity of the battery is ensured.
The multiple batteries comprise a series battery pack consisting of two or more lithium batteries.
The other system circuit is a switching regulator functional circuit system for outputting voltage, can be a single-chip integrated chip, and can also be an off-chip circuit structure for realizing a specific function combination circuit. The input end of the output voltage regulator is connected with the output VOUT of the switch type voltage regulator. The power it supplies may be provided by a single voltage regulator. When the VIN power does not reach the power required by the circuit, power can be supplied back to the system circuit by VBAT.
The output of the PM1 driving circuit is connected to the grid of the PM1, and the input control ends are respectively connected to the output of VOUT and the sampling amplifier. By the control drive circuit, the drain voltage and the flowing current of the PM1 power tube can be effectively protected from exceeding the set limit threshold. Meanwhile, a current negative feedback closed loop is formed by the PM1, the sampling amplifier and the RS sampling resistor, and the closed loop can effectively set the constant current of VOUT and VBAT within a preset value range.
The PM1 drive circuit is used to drive and control the gate voltage of PM1, thereby controlling the current value of PM 1.
The sampling resistor RS and the sampling amplifier are used for monitoring the forward or reverse current of the path from VOUT to VBAT.
One end of the RS is connected to the negative terminal of the sampling amplifier, the negative terminal of the sampling amplifier is connected to V1, the other end of the RS is connected to the positive terminal of the sampling amplifier, the positive terminal of the sampling amplifier is connected to VBAT, and the output of the sampling amplifier is connected to the control protection circuit of PM1 and the control terminal of the switching regulator. For controlling the current from VIN to VOUT and the positive and negative current values between VOUT and VBAT.
Completely closing the path between VOUT and VBAT. To prevent the substrate of PM1 from creating parasitic forward diode conduction to the source or drain of PM1, a substrate select circuit is required to connect the substrate of PM1 to where VOUT or V1 potentials are higher.
The circuit can charge a plurality of series batteries, and the switching regulator can also supply power for other systems. When the input power at VIN terminal is less than the power required by other system circuits 105, the PM1 driving protection circuit 104 will pull the gate of the PMOS transistor PM1 low, and open the PM1 transistor, so that the multiple batteries 106 will automatically supply power to other system circuits. When the input power at the VIN terminal is larger than the power required by other system circuits 105 and the voltage of the multiple batteries 106 is lower than the voltage of the multiple recharging terminals, the VIN input charges the batteries through the switching regulator 101 and the PMOS transistor PM 1. Because the charging and discharging efficiency of the plurality of batteries is high, the charging and discharging control system can effectively solve the problem of energy balance of supply and demand of each level of system in the large-capacity battery portable equipment. The conversion efficiency of energy is greatly improved. The system also comprises the protection functions of VOUT overvoltage protection, short-circuit protection, charging current limitation and the like.
The invention is not described in detail, but is well known to those skilled in the art.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a multisection battery charge-discharge management circuit for on-off regulator, its characterized in that includes on-off regulator, power tube PM1, sampling resistor RS, sampling amplifier, PM1 drive protection circuit, VOUT, power tube PM 1's drain electrode, PM1 drive protection circuit's input are connected respectively to the output of on-off regulator, power tube PM 1's source electrode is connected with sampling resistor RS's one end, multisection battery is connected to sampling resistor RS's the other end, power tube PM 1's grid is connected with PM1 drive protection circuit output, sampling amplifier connects in parallel sampling resistor RS's both ends, sampling amplifier's output is connected with the collection end of on-off regulator, PM1 drive protection circuit's collection end respectively, power tube PM1 is connected with substrate selection circuit.
2. The multi-cell battery charge-discharge management circuit for a switching regulator of claim 1, wherein: the substrate selection circuit comprises a comparator used for voltage comparison and two PMOS tubes PM2 and PM3, the sources of the PM2 and PM3 are connected with the substrate and are connected with the substrate of the power tube PM1, the drain of the PM2 is connected with the drain of the power tube PM1, the drain of the PM3 is connected with the source of the power tube PM1 and leads V1 out, the positive input end of the comparator is connected with VOUT, the negative input end of the comparator is connected with V1, the positive output end of the comparator is connected with the grid of the PM3, and the negative output end of the comparator is connected with the grid of the PM 2.
3. The multi-cell battery charge-discharge management circuit for a switching regulator of claim 2, wherein: the substrate selection circuit is used for substrate high potential selection, and the substrate of the selected PM2 and PM3 is connected with the higher voltage of VOUT and V1.
4. The multi-cell battery charge-discharge management circuit for a switching regulator of claim 1, wherein: the topological structure of the switch type voltage stabilizer comprises the steps of boosting, reducing voltage and boosting and reducing voltage.
5. The multi-cell battery charge-discharge management circuit for a switching regulator of claim 4, wherein: the step-down topological structure comprises a PWM pulse width control circuit, a switching power tube, a rectification power tube and an inductor, wherein the control end of the PWM pulse width control circuit is connected with the output end of a sampling amplifier, the output end of the PWM pulse width control circuit is connected with a power tube driver, the power tube driver is connected with the switching power tube and the rectification power tube, the switching power tube is connected with VIN, and the rectification power tube is connected with VOUT.
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| CN202011329175.9A CN112332498A (en) | 2020-11-24 | 2020-11-24 | Multi-battery charging and discharging management circuit for switch type voltage stabilizer |
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| KR20020008946A (en) * | 2000-07-21 | 2002-02-01 | 구자홍 | Variableness charge current control apparatus and method for li-ion battery |
| JP2004088923A (en) * | 2002-08-27 | 2004-03-18 | Seiko Instruments Inc | Secondary battery charge/discharge circuit and electronic apparatus with the same |
| JP2007068390A (en) * | 2005-08-01 | 2007-03-15 | Sanyo Electric Co Ltd | Battery pack having protection circuit |
| CN101154825A (en) * | 2006-09-30 | 2008-04-02 | 仁宝电脑工业股份有限公司 | Electric power supply system with remote control circuit and its operating method |
| CN102033560A (en) * | 2009-09-15 | 2011-04-27 | 精工电子有限公司 | Voltage regulator |
| WO2020136508A1 (en) * | 2018-12-28 | 2020-07-02 | 株式会社半導体エネルギー研究所 | Secondary battery protection circuit and secondary battery module |
| CN109861329A (en) * | 2019-02-18 | 2019-06-07 | 上海南麟电子股份有限公司 | Linear charging systems, constant-current and constant-voltage control circuit and its voltage follow control method |
| CN111786431A (en) * | 2020-06-29 | 2020-10-16 | 南京微盟电子有限公司 | Circuit for preventing battery from flowing backward current by high-input voltage-resistant charging management chip |
| CN111817407A (en) * | 2020-09-09 | 2020-10-23 | 苏州赛芯电子科技有限公司 | Lithium battery driving protection circuit, protection control circuit and protection device |
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