CN219107047U - Power supply system protection circuit and power supply system - Google Patents
Power supply system protection circuit and power supply system Download PDFInfo
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- CN219107047U CN219107047U CN202223406112.6U CN202223406112U CN219107047U CN 219107047 U CN219107047 U CN 219107047U CN 202223406112 U CN202223406112 U CN 202223406112U CN 219107047 U CN219107047 U CN 219107047U
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Abstract
The application discloses a power supply system protection circuit and power supply system belongs to circuit technical field. The power supply system protection circuit of this application includes: the input end of the auxiliary circuit detection circuit is electrically connected with an auxiliary circuit of the power supply system; the input end of the protection circuit is electrically connected with the output end of the auxiliary circuit detection circuit, the protection circuit is used for isolating auxiliary circuit detection signals and outputting the protection signals, and the auxiliary circuit detection signals are determined by the auxiliary circuit detection circuit based on the working state of the auxiliary circuit; the input end of the control circuit is electrically connected with the output end of the protection circuit, the output end of the control circuit is electrically connected with the power supply system, and the control circuit is used for responding to the protection signal to turn off the driving signal of the power supply system. The power supply system protection circuit can effectively protect the whole power supply system when the auxiliary circuit is short-circuited.
Description
Technical Field
The application belongs to the technical field of circuits, and particularly relates to a power supply system protection circuit and a power supply system.
Background
In a commonly used power supply with multipath isolated output, one path of output is used as main feedback, and other paths of output are unstable, and a one-stage BUCK or LDO circuit is added for voltage stabilization. Under the condition that the output of the auxiliary circuit (non-feedback circuit) is short-circuited, the short-circuit protection of the BUCK or LDO chip is triggered, so that the output is not generated, the condition that the power supply does not work completely and normally is caused, and the power supply of the system is abnormal.
Disclosure of Invention
The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides the power supply system protection circuit and the power supply system, which can effectively protect the whole power supply system when the auxiliary circuit is short-circuited, so that the damage to a later-stage load caused by the power supply system under the condition of short circuit is avoided.
In a first aspect, the present application provides a power supply system protection circuit, comprising:
the input end of the auxiliary circuit detection circuit is electrically connected with an auxiliary circuit of the power supply system;
the input end of the protection circuit is electrically connected with the output end of the auxiliary circuit detection circuit, the protection circuit is used for isolating auxiliary circuit detection signals and outputting the protection signals, and the auxiliary circuit detection signals are determined by the auxiliary circuit detection circuit based on the working state of the auxiliary circuit;
the input end of the control circuit is electrically connected with the output end of the protection circuit, the output end of the control circuit is electrically connected with the power supply system, and the control circuit is used for responding to the protection signal to turn off the driving signal of the power supply system.
According to the power supply system protection circuit provided by the embodiment of the application, the working state of the auxiliary road is detected by arranging the auxiliary road detection circuit, and the auxiliary road detection signal is isolated by the protection circuit and transmitted to the control circuit, so that the whole power supply system can be controlled to enter the protection state under the condition that the auxiliary road is short-circuited, the damage to the load at the later stage caused by the power supply system under the condition that the short circuit occurs is avoided, and the technical problem that the power supply system cannot work normally when the auxiliary road is short-circuited is solved.
In the power supply system protection circuit according to one embodiment of the present application, at least one of the protection circuit and the auxiliary circuit detection circuit is electrically connected to the voltage stabilizing circuit of the auxiliary circuit.
According to the power supply system protection circuit of the embodiment of the application, at least one of the protection circuit and the auxiliary circuit detection circuit is electrically connected with the voltage stabilizing circuit of the auxiliary circuit, so that the input voltage of the voltage stabilizing circuit of the auxiliary circuit can normally supply power to the auxiliary circuit detection circuit and/or the protection circuit under the condition that the auxiliary circuit is short-circuited, and the auxiliary circuit detection circuit and/or the protection circuit can normally work to normally monitor and isolate the auxiliary circuit detection signal so that the power supply system enters a protection state.
The power supply system protection circuit of an embodiment of the application, the auxiliary circuit detection circuit includes a comparator, the protection circuit includes a photoelectric coupler, the first input end of the comparator with auxiliary circuit electricity is connected, the second input end of the comparator inserts the reference signal, the output end of the comparator with the negative pole electricity of the diode side of photoelectric coupler is connected, just the output of photoelectric coupler with control circuit's input electricity is connected.
According to the power supply system protection circuit of the embodiment of the application, the comparator is arranged in the auxiliary circuit detection circuit, the photoelectric coupler is arranged in the protection circuit, the comparator can output a low level under the condition that the auxiliary circuit is short-circuited, the photoelectric coupler of the protection circuit is conducted, so that the control circuit turns off a driving signal of the power supply system, the whole power supply system enters a protection state, damage to a later stage load under the condition that the power supply system is short-circuited can be avoided, and the response speed is high and the control precision is high.
In the power supply system protection circuit of one embodiment of the present application, an anode on a diode side of the photo coupler is electrically connected with the voltage stabilizing circuit of the auxiliary circuit.
According to the power supply system protection circuit of the embodiment of the application, the anode on the diode side of the photoelectric coupler is electrically connected with the voltage stabilizing circuit of the auxiliary circuit, so that the whole power supply system enters a protection state under the condition that the auxiliary circuit is short-circuited, and the input voltage of the voltage stabilizing circuit of the auxiliary circuit still exists, so that the power supply can be normally supplied for the protection circuit.
In the power supply system protection circuit of one embodiment of the present application, the comparator is electrically connected with the voltage stabilizing circuit of the auxiliary circuit.
According to the power supply system protection circuit of the embodiment of the application, the anode on the diode side of the photoelectric coupler is electrically connected with the voltage stabilizing circuit of the auxiliary circuit, so that the whole power supply system enters a protection state under the condition that the auxiliary circuit is short-circuited, and the input voltage of the voltage stabilizing circuit of the auxiliary circuit still exists, so that the power supply for the auxiliary circuit detection circuit can be normally carried out.
In the power supply system protection circuit according to an embodiment of the present application, when the auxiliary circuit detection circuit is a voltage detection circuit, the first input end is a non-inverting input end, the second input end is an inverting input end, and the reference signal is a voltage reference signal.
According to the power supply system protection circuit of the embodiment of the application, under the condition that the auxiliary circuit detection circuit is a voltage detection circuit, the first input end is set to be an in-phase input end, the second input end is set to be an opposite-phase input end, then the detection value of the auxiliary circuit output voltage of the in-phase input end of the comparator and the voltage reference signal of the opposite-phase input end of the comparator are compared, so that the high level or the low level is output based on the working state of the auxiliary circuit, the control circuit can close the driving signal of the power supply system under the condition that the auxiliary circuit is short-circuited, the whole power supply system enters the protection state, and damage to a later stage load under the condition that the power supply system is short-circuited is avoided.
In the power supply system protection circuit according to an embodiment of the present application, when the auxiliary circuit detection circuit is a current detection circuit, the first input end is an inverting input end, the second input end is a non-inverting input end, and the reference signal is a current reference signal.
According to the power supply system protection circuit of the embodiment of the application, under the condition that the auxiliary circuit detection circuit is a current detection circuit, the first input end is set to be an inverted input end, the second input end is set to be an in-phase input end, then the detection value of the auxiliary circuit output current of the inverted input end of the comparator and the level of the current reference signal of the in-phase input end of the comparator are compared, so that the high level or the low level is output based on the working state of the auxiliary circuit, the control circuit can close the driving signal of the power supply system under the condition that the auxiliary circuit is short-circuited, the whole power supply system enters the protection state, and damage to a later stage load under the condition that the power supply system is short-circuited is avoided.
The utility model provides a power supply system protection circuit of an embodiment, the auxiliary road is a plurality of, auxiliary road detection circuit is a plurality of, protection circuit is a plurality of, just the auxiliary road with auxiliary road detection circuit one-to-one, auxiliary road detection circuit with protection circuit one-to-one, a plurality of protection circuit's output respectively with control circuit's input electricity is connected.
According to the power supply system protection circuit of the embodiment of the application, the plurality of auxiliary ways, the auxiliary way detection circuit and the protection circuit are arranged, so that the control circuit can close the driving signal of the power supply system under the condition that any auxiliary way is short-circuited, the whole power supply system enters a protection state, the damage to a rear-stage load caused by the incomplete work of the power supply system is avoided, and the application scene of the power supply system protection circuit is widened.
In a second aspect, the present application provides a power supply system comprising:
the power supply converter comprises a main path and at least one auxiliary path;
the power supply system protection circuit according to the first aspect, wherein one end of the power supply system protection circuit is electrically connected to the at least one auxiliary circuit, and the other end of the power supply system protection circuit is electrically connected to the power supply converter.
According to the power supply system provided by the embodiment of the application, the power supply converter and the power supply system protection circuit are arranged in the power supply system, so that the control circuit can close the driving signal of the power supply system under the condition that any auxiliary circuit is short-circuited, and the whole power supply system can enter a protection state to avoid damage to a rear-stage load under the condition of incomplete work of the power supply system.
The power supply system of one embodiment of the application further comprises a voltage stabilizing circuit, wherein the voltage stabilizing circuit is connected to at least one auxiliary circuit, and the voltage stabilizing circuit is electrically connected with the power supply system protection circuit.
According to the power supply system of the embodiment of the application, the voltage stabilizing circuit is arranged in the power supply system and connected in at least one path of auxiliary circuit, and the voltage stabilizing circuit is electrically connected with the power supply system protection circuit, so that under the condition that any auxiliary circuit is short-circuited, the input voltage of the voltage stabilizing circuit corresponding to the auxiliary circuit can be normally supplied to the auxiliary circuit detection circuit and the protection circuit in the power supply system protection circuit.
The above technical solutions in the embodiments of the present application have at least one of the following technical effects:
the auxiliary road detection circuit is arranged to detect the working state of the auxiliary road, and the auxiliary road detection signal is isolated by the protection circuit and transmitted to the control circuit, so that the whole power supply system can be controlled to enter the protection state under the condition that the auxiliary road is short-circuited, the damage to the load at the later stage caused by the power supply system under the condition that the short circuit occurs is avoided, and the technical problem that the power supply system cannot work normally when the auxiliary road is short-circuited is solved.
Furthermore, by arranging at least one of the protection circuit and the auxiliary circuit detection circuit to be electrically connected with the voltage stabilizing circuit of the auxiliary circuit, the input voltage of the voltage stabilizing circuit of the auxiliary circuit can normally supply power to the auxiliary circuit detection circuit and/or the protection circuit under the condition that the auxiliary circuit is short-circuited, so that the auxiliary circuit detection circuit and/or the protection circuit can normally work, and the auxiliary circuit detection signal can be normally monitored and isolated to enable the power supply system to enter a protection state.
Furthermore, by arranging the comparator in the auxiliary circuit detection circuit and arranging the photoelectric coupler in the protection circuit, the comparator can output a low level under the condition that the auxiliary circuit is short-circuited, and the photoelectric coupler of the protection circuit is conducted, so that the control circuit turns off a driving signal of the power supply system, the whole power supply system enters a protection state, the damage to a later-stage load caused by the short circuit of the power supply system can be avoided, the response speed is high, and the control precision is high.
Still further, through the positive pole of the diode side of photoelectric coupler and the steady voltage circuit electricity connection of auxiliary road, can be under the circumstances that auxiliary circuit takes place the short circuit, whole electrical power generating system gets into the protection state, and the input voltage of the steady voltage circuit of auxiliary road still exists, can normally supply power for the protection circuit.
Still further, through the positive pole of the diode side of photoelectric coupler and the steady voltage circuit electricity connection of auxiliary road, can be under the condition that auxiliary road circuit takes place the short circuit, whole electrical power generating system gets into the protection state, and the input voltage of the steady voltage circuit of auxiliary road still exists, can be for the normal power supply of auxiliary road detection circuit.
Still further, through setting the first input end as the homophase input end under the condition that the auxiliary circuit detection circuit is voltage detection circuit, the second input end is set as the inverting input end, then the detection value of the auxiliary circuit output voltage of the homophase input end of the comparator and the voltage reference signal of the inverting input end of the comparator are compared, thereby output high level or low level based on the operating condition of the auxiliary circuit, thereby make control circuit can close the drive signal of the power supply system under the condition that the auxiliary circuit takes place the short circuit, whole power supply system gets into the protection state, and then avoid the power supply system to cause the damage to the later stage load under the condition that takes place the short circuit.
Still further, through setting up the first input as the reverse phase input under the condition that auxiliary circuit detection circuit is current detection circuit, the second input sets up as the homophase input, then the detection value of the auxiliary circuit output current of the reverse phase input of comparison comparator and the current reference signal's of comparator homophase input height to output high level or low level based on the operating condition of auxiliary circuit, thereby make control circuit can close electrical power system's drive signal under the condition that auxiliary circuit took place the short circuit, whole electrical power system gets into the protection state, and then avoid electrical power system to cause the damage to the later stage load under the condition that takes place the short circuit.
Still further, through setting up a plurality of auxiliary circuits, auxiliary circuit detection circuit and protection circuit, can be under the condition that any auxiliary circuit takes place the short circuit, control circuit closes electrical power generating system's drive signal, and whole electrical power generating system gets into the protection state, avoids electrical power generating system to cause the damage to the later stage load under the condition of incomplete work, has widened this electrical power generating system protection circuit's application scenario.
Still further, through setting up power converter and electrical power generating system protection circuit in electrical power generating system, can be under the circumstances that arbitrary auxiliary circuit took place the short circuit, control circuit closes electrical power generating system's drive signal, and whole electrical power generating system can get into the protection state, avoids electrical power generating system to damage to the later stage load under the circumstances of incomplete work.
Still further, through setting up voltage stabilizing circuit in electrical power generating system, voltage stabilizing circuit connects in at least one way auxiliary road, and voltage stabilizing circuit and electrical power generating system protection circuit electricity are connected, can be under the circumstances that arbitrary auxiliary road takes place the short circuit, the input voltage of voltage stabilizing circuit that the auxiliary road corresponds can be for the normal power supply of auxiliary road detection circuit and protection circuit in the electrical power generating system protection circuit.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, wherein:
fig. 1 is a schematic diagram of a power supply system protection circuit according to an embodiment of the present disclosure;
FIG. 2 is a second schematic diagram of a power system protection circuit according to an embodiment of the present disclosure;
FIG. 3 is a third schematic diagram of a power system protection circuit according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a power system protection circuit according to an embodiment of the present disclosure;
FIG. 5 is a fifth schematic diagram of a power system protection circuit according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a power supply system according to an embodiment of the present application.
Reference numerals:
an auxiliary path detection circuit 110; a protection circuit 120; a control circuit 130; a power converter 140.
Detailed Description
Technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type and not limited to the number of objects, e.g., the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
1. In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
2. In the description of the present application, the meaning of "plurality" is two or more.
A power supply system protection circuit of an embodiment of the present application is described below with reference to fig. 1 to 5.
As shown in fig. 1, the power supply system protection circuit includes: an auxiliary circuit detection circuit 110, a protection circuit 120, and a control circuit 130.
In this embodiment, the input terminal of the auxiliary circuit detection circuit 110 is electrically connected to an auxiliary circuit of the power supply system.
The auxiliary road detection circuit 110 is used for detecting the operation state of the auxiliary road.
The input end of the protection circuit 120 is electrically connected to the output end of the auxiliary circuit detection circuit 110, and the protection circuit 120 is configured to isolate an auxiliary circuit detection signal and output a protection signal, where the auxiliary circuit detection signal is determined by the auxiliary circuit detection circuit 110 based on the working state of the auxiliary circuit.
It will be appreciated that the secondary path detection signal is a signal that is used to characterize the occurrence of a short circuit in the secondary path.
The protection signal is a signal for representing the fault of the output circuit of the power supply system, and the protection signal is a signal isolating the detection signal of the auxiliary circuit.
The input end of the control circuit 130 is electrically connected to the output end of the protection circuit 120, the output end of the control circuit 130 is electrically connected to the power system, and the control circuit 130 is configured to turn off the driving signal of the power system in response to the protection signal, so that the whole power system enters a protection state.
In the actual execution process, the working state of the auxiliary road is detected by the auxiliary road detection circuit 110, under the condition that the auxiliary road is short-circuited, a short-circuit detection signal is transmitted to the protection circuit 120, the short-circuit detection signal is isolated by the protection circuit 120, a protection signal is generated based on the short-circuit detection signal, the protection signal is transmitted to the control circuit 130, and the control circuit 130 responds to the protection signal and turns off the driving signal of the power supply system so that the whole power supply system enters the protection state.
The applicant finds that in the research and development process, in the related technology, a protection circuit with multiple outputs exists, and the protection circuit comprises an isolation feedback module, a reference comparison module, a switch time sequence control module and a controlled switch module. The method mainly uses the controlled switch module to act on the reference comparison module and then influences the isolation feedback module, thereby achieving the purpose of protecting the circuit; specifically, when the short circuit of the auxiliary circuit is detected, the working loop of the reference comparison module is cut off through the controlled switch module, so that the connected isolation feedback module triggers the switch time sequence control module to enter a system protection state, and the purpose of protecting the circuit is achieved.
In this application, under the condition that the auxiliary circuit is short-circuited, the protection circuit 120 isolates the signal and directly acts on the control circuit 130, so that the purpose of protecting the circuit can be achieved without setting a switch module or other modules, and the protection circuit is low in design cost, simple in structure and easy to realize.
According to the power supply system protection circuit provided by the embodiment of the application, the working state of the auxiliary road is detected by arranging the auxiliary road detection circuit 110, and the auxiliary road detection signal is isolated by the protection circuit 120 and is transmitted to the control circuit 130, so that the whole power supply system can be controlled to enter the protection state under the condition that the auxiliary road is short-circuited, the damage to the later-stage load caused by the power supply system under the condition that the short circuit occurs can be avoided, and the technical problem that the power supply system cannot work normally when the auxiliary road is short-circuited is solved.
As shown in fig. 2 and 3, in some embodiments, at least one of protection circuit 120 and auxiliary circuit detection circuit 110 is electrically connected to a voltage regulator circuit of the auxiliary circuit.
In this embodiment, the voltage stabilizing circuit may be a BUCK circuit or other voltage stabilizing circuit.
The protection circuit 120 may be electrically connected to the auxiliary voltage stabilizing circuit, and the auxiliary voltage detecting circuit 110 may be electrically connected to the auxiliary voltage stabilizing circuit, or the protection circuit 120 and the auxiliary voltage detecting circuit 110 may be electrically connected to the auxiliary voltage stabilizing circuit.
IN the actual execution process, under the condition that the auxiliary circuit is short-circuited, the input voltage V1_IN of the voltage stabilizing circuit of the auxiliary circuit still exists, and the auxiliary circuit detecting circuit 110 and/or the protecting circuit 120 can be powered to work normally, so that the auxiliary circuit detecting signal can be monitored and isolated normally, and the whole power supply system can be controlled to enter a protecting state normally under the condition that the auxiliary circuit is short-circuited.
According to the power supply system protection circuit provided by the embodiment of the application, at least one of the protection circuit 120 and the auxiliary circuit detection circuit 110 is electrically connected with the voltage stabilizing circuit of the auxiliary circuit, so that the input voltage V1-IN of the voltage stabilizing circuit of the auxiliary circuit can normally supply power to the auxiliary circuit detection circuit 110 and/or the protection circuit 120 under the condition that the auxiliary circuit is short-circuited, and the auxiliary circuit detection circuit and/or the protection circuit can normally work to normally monitor and isolate the auxiliary circuit detection signal so that the power supply system enters a protection state.
In some embodiments, the auxiliary circuit detection circuit 110 includes a comparator, a first input terminal of the comparator is electrically connected with the auxiliary circuit, a second input terminal of the comparator is connected with a reference signal, and an output terminal of the comparator is electrically connected with a cathode of a diode side of the photoelectric coupler;
the protection circuit 120 includes a photo coupler, and an output terminal of the photo coupler is electrically connected to an input terminal of the control circuit 130.
In this embodiment, the comparator is configured to output a level signal to the protection circuit 120 based on the state of the auxiliary circuit.
The reference signal is a signal obtained based on reference modulation.
The optocoupler is used to isolate signals input and output to the protection circuit 120.
In the actual implementation process, under the condition that the auxiliary circuit works normally, the comparator outputs a high level, the photoelectric coupler of the protection circuit 120 is not conducted, and the control circuit 130 works normally.
In the case of a short circuit of the auxiliary circuit, the comparator outputs a low level, the photocoupler of the protection circuit 120 is turned on, and the signal at the end of the control circuit 130 is reduced, so that the control circuit 130 turns off the driving signal of the power system, and the whole power system enters a protection state.
According to the power supply system protection circuit provided by the embodiment of the application, the comparator is arranged in the auxiliary circuit detection circuit 110, the photoelectric coupler is arranged in the protection circuit 120, the comparator can output a low level under the condition that the auxiliary circuit is short-circuited, the photoelectric coupler of the protection circuit 120 is conducted, so that the control circuit 130 turns off a driving signal of the power supply system, the whole power supply system enters a protection state, damage to a rear-stage load under the condition that the power supply system is short-circuited can be avoided, and the control precision is high and the response speed is high.
In some embodiments, the anode on the diode side of the photocoupler is electrically connected to the voltage regulator circuit of the auxiliary circuit.
IN the actual implementation process, when the auxiliary circuit is short-circuited, the comparator outputs a low level, the photocoupler of the protection circuit 120 is turned on, and the signal at the end of the control circuit 130 is reduced, so that the control circuit 130 turns off the driving signal of the power supply system, the whole power supply system enters a protection state, and the input voltage v1_in of the voltage stabilizing circuit of the auxiliary circuit still exists to supply power to the protection circuit 120.
According to the power supply system protection circuit provided by the embodiment of the application, the anode on the diode side of the photoelectric coupler is electrically connected with the voltage stabilizing circuit of the auxiliary circuit, so that the whole power supply system enters a protection state under the condition that the auxiliary circuit is short-circuited, and the input voltage V1-IN of the voltage stabilizing circuit of the auxiliary circuit still exists, so that normal power supply can be provided for the protection circuit 120.
In some embodiments, the comparator is electrically connected to a voltage regulator circuit of the auxiliary circuit.
IN the actual implementation process, when the auxiliary circuit is short-circuited, the comparator outputs a low level, the photocoupler of the protection circuit 120 is turned on, and the signal at the end of the control circuit 130 is reduced, so that the control circuit 130 turns off the driving signal of the power supply system, the whole power supply system enters a protection state, and the input voltage v1_in of the voltage stabilizing circuit of the auxiliary circuit still exists to supply power to the protection circuit 120.
According to the power supply system protection circuit provided by the embodiment of the application, the anode on the diode side of the photoelectric coupler is electrically connected with the voltage stabilizing circuit of the auxiliary circuit, so that the whole power supply system enters a protection state under the condition that the auxiliary circuit is short-circuited, and the input voltage V1-IN of the voltage stabilizing circuit of the auxiliary circuit still exists, so that normal power supply can be provided for the auxiliary circuit detection circuit 110.
In some embodiments, as shown in fig. 2, where the auxiliary circuit detection circuit 110 is a voltage detection circuit, the first input is a non-inverting input, the second input is an inverting input, and the reference signal is a voltage reference signal.
In this embodiment, the voltage reference signal is used as a basis for calibrating the output voltage of the auxiliary circuit in the circuit.
In the actual execution process, under the condition that the auxiliary circuit works normally, the detection value of the auxiliary circuit output voltage at the non-inverting input end of the comparator is high Yu Bijiao, the voltage reference signal at the inverting input end of the comparator outputs a high level, the photoelectric coupler of the protection circuit 120 is not conducted, and the control circuit 130 works normally.
Under the condition that the auxiliary circuit is short-circuited, the detection value of the auxiliary circuit output voltage at the non-inverting input end of the comparator is lower than the voltage reference signal at the inverting input end of the comparator, the comparator outputs a low level, the photoelectric coupler of the protection circuit 120 is conducted, the signal at the end of the control circuit 130 is reduced, and therefore the control circuit 130 turns off the driving signal of the power supply system, and the whole power supply system enters a protection state.
Of course, in other embodiments, by changing part of the wiring manner, it is also possible to implement that the comparator outputs a low level in normal operation, the photocoupler of the protection circuit 120 is not conductive, and the control circuit 130 operates normally; under the condition that the auxiliary circuit is short-circuited, the comparator outputs a high level, the photoelectric coupler of the protection circuit 120 is conducted, the signal at the end of the control circuit 130 is reduced, so that the control circuit 130 turns off the driving signal of the power supply system, and the whole power supply system enters a protection state; the best connection mode can be selected based on practical situations, and the application is not limited.
According to the power supply system protection circuit provided by the embodiment of the application, under the condition that the auxiliary circuit detection circuit 110 is a voltage detection circuit, the first input end is set to be an in-phase input end, the second input end is set to be an opposite-phase input end, and then the detection value of the auxiliary circuit output voltage of the in-phase input end of the comparator and the voltage reference signal of the opposite-phase input end of the comparator are compared, so that the high level or the low level is output based on the working state of the auxiliary circuit, the control circuit 130 can close the driving signal of the power supply system under the condition that the auxiliary circuit is short-circuited, and the whole power supply system enters the protection state, so that damage to the rear-stage load caused by the power supply system under the condition that the short circuit occurs is avoided.
In some embodiments, as shown in fig. 3, where the auxiliary circuit detection circuit 110 is a current detection circuit, the first input is an inverting input, the second input is a non-inverting input, and the reference signal is a current reference signal.
In this embodiment, the current reference signal is used as a basis for calibrating the output current of the auxiliary circuit in the circuit.
The signal input to the comparator is finally a voltage signal.
In the actual execution process, under the condition that the auxiliary circuit works normally, the detection value of the auxiliary circuit output current at the inverting input end of the comparator is lower than the current reference signal at the non-inverting input end of the comparator, the comparator outputs a high level, the photoelectric coupler of the protection circuit 120 is not conducted, and the control circuit 130 works normally.
Under the condition that the auxiliary circuit is short-circuited, the detection value of the auxiliary circuit output current at the inverting input end of the comparator is high Yu Bijiao, the comparator outputs a current reference signal at the non-inverting input end of the protector, the photoelectric coupler of the protection circuit 120 is conducted, the signal at the end of the control circuit 130 is reduced, and therefore the control circuit 130 turns off the driving signal of the power supply system, and the whole power supply system enters a protection state.
According to the power supply system protection circuit 120 provided by the embodiment of the application, under the condition that the auxiliary circuit detection circuit 110 is a current detection circuit, the first input end is set to be an inverted input end, the second input end is set to be an in-phase input end, and then the detection value of the auxiliary circuit output current of the inverted input end of the comparator and the level of the current reference signal of the in-phase input end of the comparator are compared, so that the high level or the low level is output based on the working state of the auxiliary circuit, the control circuit 130 can close the driving signal of the power supply system under the condition that the auxiliary circuit is short-circuited, and the whole power supply system enters the protection state, so that the damage to the rear-stage load caused by the power supply system under the condition that the short circuit occurs is avoided.
As shown in fig. 4, in some embodiments, the number of auxiliary circuits may be plural, the number of auxiliary circuit detection circuits 110 may be plural, the number of protection circuits 120 may be plural, the auxiliary circuits and the auxiliary circuit detection circuits 110 are in one-to-one correspondence, the auxiliary circuit detection circuits 110 and the protection circuits 120 are in one-to-one correspondence, and the output ends of the plurality of protection circuits 120 are respectively electrically connected to the input ends of the control circuit 130.
In this embodiment, as shown in fig. 5, in the case where there are two auxiliary circuits, there may be two corresponding auxiliary circuit detection circuits 110, and there may be two protection circuits 120.
In the actual implementation process, when the auxiliary circuit detection circuit 110 is a voltage detection circuit, under the condition that both auxiliary circuits work normally, the detection values of the auxiliary circuit output voltages at the non-inverting input ends of the comparator 1 and the comparator 2 are higher than the voltage reference signal at the inverting input end, the comparator 1 and the comparator 2 output high levels, the photoelectric couplers of the protection circuit 1201 and the protection circuit 1202 are not conducted, and the control circuit 130 works normally.
In the case that at least one of the two auxiliary circuits is shorted, the detection value of the auxiliary circuit output voltage at the non-inverting input end of at least one of the comparator 1 and the comparator 2 is lower than the voltage reference signal at the inverting input end, at least one of the comparator 1 and the comparator 2 outputs a low level, the photocoupler of at least one of the two protection circuits 120 is turned on, the signal at the control circuit 130 end is reduced, so that the control circuit 130 turns off the driving signal of the power system, and the whole power system enters a protection state.
According to the power supply system protection circuit provided by the embodiment of the application, by arranging the auxiliary circuits, the auxiliary circuit detection circuit 110 and the protection circuit 120, the control circuit 130 can close the driving signal of the power supply system under the condition that any auxiliary circuit is short-circuited, the whole power supply system enters a protection state, the damage to the later-stage load caused by the incomplete work of the power supply system is avoided, and the application scene of the power supply system protection circuit 120 is widened.
The application also provides a power supply system.
A power supply system according to an embodiment of the present application is described below with reference to fig. 6.
The power supply system can be applied to the technical field of circuits, for example, under the condition that a short circuit occurs in an auxiliary circuit, the control circuit 130 turns off a driving signal of the power supply system, and the whole power supply system enters a protection state to avoid damage to a rear-stage load caused by incomplete work of the power supply system.
As shown in fig. 6, the power supply system includes: a power converter 140 and a power system protection circuit 120.
In this embodiment, the power converter 140 includes a main path and at least one auxiliary path, as shown in fig. 6, for example, the power converter 140 may include a main path and two auxiliary paths, vo is a main path output, and V1 and V2 are auxiliary path outputs.
The power system protection circuit is the power system protection circuit described in any of the above embodiments, one end of the power system protection circuit is electrically connected to at least one auxiliary circuit, and the other end of the power system protection circuit is electrically connected to the power converter 140.
According to the power supply system provided by the embodiment of the application, the power supply converter 140 and the power supply system protection circuit are arranged in the power supply system, so that the control circuit 130 can close the driving signal of the power supply system under the condition that any auxiliary circuit is short-circuited, and the whole power supply system can enter a protection state to avoid damage to a rear-stage load under the condition that the power supply system does not work completely.
With continued reference now to fig. 6, in some embodiments, the power supply system may also include a voltage regulator circuit.
In this embodiment, the voltage stabilizing circuit is connected to at least one auxiliary circuit, and the voltage stabilizing circuit is electrically connected to the power system protection circuit.
In the actual implementation, as shown in fig. 6, for example, the power converter 140 may include a main path and two auxiliary paths, where Vo is the main path output and V1 and V2 are the auxiliary path outputs.
IN the case where a short circuit occurs IN any of the auxiliary circuits, the input voltages v1_in and v2_in of the voltage stabilizing circuits corresponding to the auxiliary circuits may supply power to the auxiliary circuit detecting circuit 110 and the protection circuit 120.
According to the power supply system provided by the embodiment of the application, the voltage stabilizing circuit is arranged IN the power supply system and connected IN at least one path of auxiliary circuit, and the voltage stabilizing circuit is electrically connected with the power supply system protection circuit, so that under the condition that any auxiliary circuit is short-circuited, the input voltages V1_IN and V2_IN of the voltage stabilizing circuit corresponding to the auxiliary circuit can normally supply power to the auxiliary circuit detection circuit 110 and the protection circuit 120.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A power supply system protection circuit, comprising:
the input end of the auxiliary circuit detection circuit is electrically connected with an auxiliary circuit of the power supply system;
the input end of the protection circuit is electrically connected with the output end of the auxiliary circuit detection circuit, the protection circuit is used for isolating auxiliary circuit detection signals and outputting the protection signals, and the auxiliary circuit detection signals are determined by the auxiliary circuit detection circuit based on the working state of the auxiliary circuit;
the input end of the control circuit is electrically connected with the output end of the protection circuit, the output end of the control circuit is electrically connected with the power supply system, and the control circuit is used for responding to the protection signal to turn off the driving signal of the power supply system.
2. The power supply system protection circuit according to claim 1, wherein at least one of the protection circuit and the auxiliary circuit detection circuit is electrically connected to a voltage stabilizing circuit of the auxiliary circuit.
3. The power supply system protection circuit according to claim 1, wherein the auxiliary circuit detection circuit includes a comparator, the protection circuit includes a photo coupler, a first input terminal of the comparator is electrically connected to the auxiliary circuit, a second input terminal of the comparator is connected to a reference signal, an output terminal of the comparator is electrically connected to a cathode of a diode side of the photo coupler, and an output terminal of the photo coupler is electrically connected to an input terminal of the control circuit.
4. The power supply system protection circuit according to claim 3, wherein an anode on a diode side of the photocoupler is electrically connected to a voltage stabilizing circuit of the auxiliary circuit.
5. A power supply system protection circuit according to claim 3, wherein the comparator is electrically connected to a voltage stabilizing circuit of the auxiliary circuit.
6. A power supply system protection circuit according to claim 3, wherein in the case where the auxiliary circuit detection circuit is a voltage detection circuit, the first input terminal is a non-inverting input terminal, the second input terminal is an inverting input terminal, and the reference signal is a voltage reference signal.
7. A power supply system protection circuit according to claim 3, wherein in the case where the auxiliary circuit detection circuit is a current detection circuit, the first input terminal is an inverting input terminal, the second input terminal is a non-inverting input terminal, and the reference signal is a current reference signal.
8. The power supply system protection circuit according to any one of claims 1 to 7, wherein the number of the auxiliary circuits is plural, the number of the auxiliary circuit detection circuits is plural, the auxiliary circuits are in one-to-one correspondence with the auxiliary circuit detection circuits, the auxiliary circuit detection circuits are in one-to-one correspondence with the protection circuits, and the output ends of the plurality of the protection circuits are electrically connected with the input ends of the control circuit, respectively.
9. A power supply system, comprising:
the power supply converter comprises a main path and at least one auxiliary path;
the power supply system protection circuit of any one of claims 1-8, wherein one end of the power supply system protection circuit is electrically connected to the at least one auxiliary circuit, and the other end of the power supply system protection circuit is electrically connected to the power converter.
10. The power system of claim 9, further comprising a voltage regulator circuit connected in the at least one auxiliary circuit, and the voltage regulator circuit is electrically connected to the power system protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223406112.6U CN219107047U (en) | 2022-12-15 | 2022-12-15 | Power supply system protection circuit and power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223406112.6U CN219107047U (en) | 2022-12-15 | 2022-12-15 | Power supply system protection circuit and power supply system |
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| Publication Number | Publication Date |
|---|---|
| CN219107047U true CN219107047U (en) | 2023-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223406112.6U Active CN219107047U (en) | 2022-12-15 | 2022-12-15 | Power supply system protection circuit and power supply system |
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| Country | Link |
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| CN (1) | CN219107047U (en) |
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