CN115377935A - Short-circuit protection system and method for parallel power supply modules - Google Patents
Short-circuit protection system and method for parallel power supply modules Download PDFInfo
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- CN115377935A CN115377935A CN202210984972.3A CN202210984972A CN115377935A CN 115377935 A CN115377935 A CN 115377935A CN 202210984972 A CN202210984972 A CN 202210984972A CN 115377935 A CN115377935 A CN 115377935A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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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
- H02H7/10—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 converters; for rectifiers
- H02H7/12—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 converters; for rectifiers for static converters or rectifiers
- H02H7/1203—Circuits independent of the type of conversion
- H02H7/1206—Circuits independent of the type of conversion specially adapted to conversion cells composed of a plurality of parallel or serial connected elements
Abstract
The invention relates to a short-circuit protection system and a short-circuit protection method for parallel power supply modules, which are characterized by comprising a single chip microcomputer and a plurality of protection circuits, wherein each protection circuit corresponds to a certain path of power supply module in a power supply system and comprises a current detection unit, a current comparison unit, a control unit and a relay; the single chip microcomputer is used for outputting a control signal to each control unit according to the requirement of switching on or switching off the relay; the current detection unit is used for detecting a current sampling value of a circuit where the corresponding power supply module is located; the current comparison unit is used for comparing the current sampling value detected by the corresponding current detection unit with a current set value to obtain a current comparison signal; the control unit is used for performing AND operation on the current comparison signal and a control signal output by the singlechip and outputting a control level; the relay is used for controlling the on-off of the circuit where the corresponding power supply module is located based on the control level output by the control unit.
Description
Technical Field
The invention relates to the field of protection of parallel power supply modules, in particular to a short-circuit protection system and a short-circuit protection method for the parallel power supply modules.
Background
At present, the single module power of the existing power module cannot be very large, so when a power system has a high-power requirement, several power modules are generally required to be connected in parallel so as to increase the power output. However, if the input terminal of a certain power module is short-circuited in the parallel output process, the input terminal of the whole power system is short-circuited, and the whole power system fails. To prevent this, a short-circuit protection function needs to be added to the input terminal of the power supply system.
However, the short-circuit protection method in the prior art has a slow response speed, needs to add many additional devices such as a micro control unit and a latch device, has a high cost, cannot ensure that a faulty branch is cut off quickly, and cannot meet the short-circuit protection requirement of the parallel module of the power system.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a system and a method for short-circuit protection of parallel power modules, which are low in cost and capable of quickly cutting off a faulty branch.
In order to achieve the purpose, the invention adopts the following technical scheme: on one hand, the short-circuit protection system for the parallel power supply modules comprises a single chip microcomputer and a plurality of protection circuits, wherein each protection circuit corresponds to one path of power supply module in a power supply system and comprises a current detection unit, a current comparison unit, a control unit and a relay;
the single chip microcomputer is used for outputting a control signal to each control unit according to the requirement of switching on or switching off the relay;
the current detection unit is used for detecting a current sampling value corresponding to a circuit where the power supply module is located;
the current comparison unit is used for comparing a current sampling value detected by the corresponding current detection unit with a current set value to obtain a current comparison signal;
the control unit is used for performing AND operation on the current comparison signal and the control signal output by the singlechip and outputting a control level;
the relay is used for controlling the on-off of a circuit corresponding to the power supply module based on the control level output by the control unit.
Furthermore, each protection circuit further comprises a voltage division unit, and the voltage division unit is used for dividing the voltage of the power supply system to a preset voltage according to a certain proportion and sending the preset voltage to the current comparison unit.
Furthermore, each protection circuit further comprises a reset circuit, each reset circuit is respectively connected with the single chip microcomputer, and the reset circuit is used for resetting the circuit corresponding to the power module.
Furthermore, each current comparison unit comprises a comparator and a diode, the comparator is used for outputting a current comparison signal to the control unit according to a current sampling value and a current set value, and the diode is used for ensuring that the output voltage of the comparator cannot be increased when the relay is disconnected with a circuit corresponding to the power supply module.
Further, in one of the protection circuits, one end of the reset circuit is connected to an input end of a power supply system, the other end of the reset circuit is connected in parallel to a first input end of the comparator and one end of a second voltage-dividing resistor in the voltage-dividing unit through a first voltage-dividing resistor in the voltage-dividing unit, a second input end of the comparator is connected to the current detection unit, an output end of the comparator is connected in parallel to an input end of the control unit and a negative end of the diode, and a positive end of the diode and the other end of the second voltage-dividing resistor are respectively grounded; the output end of the control unit is connected with the input end of the relay, and the output end of the relay is connected with the power supply module correspondingly.
In another aspect, a method for short-circuit protection of parallel power modules is provided, including:
in a power supply system, a current detection unit of each protection circuit detects a current sampling value of a circuit where a corresponding power supply module is located and sends the current sampling value to a corresponding current comparison unit;
the current comparison unit of each protection circuit compares the received current sampling value with a preset current set value to obtain a current comparison signal and sends the current comparison signal to the corresponding control unit;
the control unit of each protection circuit performs AND operation on the current comparison signal output by the corresponding current comparison unit and the control signal output by the single chip microcomputer, and outputs a control level to the corresponding relay;
and the relay of each protection circuit controls the on-off of the circuit where the corresponding power supply module is based on the control level output by the corresponding control unit.
Further, the current comparison unit of each protection circuit compares the received current sampling value with a preset current setting value to obtain a current comparison signal and sends the current comparison signal to the corresponding control unit, and the method includes:
a current comparison unit of each protection circuit obtains a current set value in advance;
the current comparison unit of each protection circuit receives the current sampling value sent by the corresponding current detection unit, compares the received current sampling value with the current set value, and outputs a current comparison signal to the control unit.
Further, the current comparing unit of each protection circuit receives the current sampling value sent by the corresponding current detecting unit, compares the received current sampling value with the current set value, and outputs a current comparing signal to the control unit, including:
under the normal working condition, the current sampling value is smaller than the current set value, and the current comparison unit outputs a high level to the control unit; when the circuit is in short circuit, the current sampling value is larger than the current set value, and the current comparison unit outputs a low level to the control unit.
Further, the control unit of each protection circuit performs and operation on the current comparison signal output by the corresponding current comparison unit and the control signal output by the single chip microcomputer, and outputs a control level to the corresponding relay, including:
when no overcurrent condition occurs, the current comparison unit outputs a high level, if the relay is required to be switched on, the single chip microcomputer outputs the high level, the control unit performs AND gate operation on the high level output by the single chip microcomputer and the high level output by the current comparison unit, and the control unit outputs the high level to switch on the relay; if the relay is required to be turned off, the single chip microcomputer outputs a low level, the control unit performs AND gate operation on the low level output by the single chip microcomputer and the high level output by the current comparison unit, and the control unit outputs a low level to turn off the relay;
when an overcurrent condition occurs, the current comparison unit outputs a low level, the single chip microcomputer outputs a high level or a low level no matter the relay is required to be switched on and switched off, the control unit performs AND gate operation on the high level or the low level output by the single chip microcomputer and the low level output by the current comparison unit, and the control unit only outputs the low level to switch off the relay.
Further, the method also includes;
the reset circuit controls the on-off of the power supply of the whole system through a reset control signal output by the singlechip.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the short-circuit protection function is realized by hardware, software is not needed, the response time of short-circuit protection can be shortened, the circuit components are reduced, and the cost is saved.
2. The invention is provided with a plurality of protection circuits, and can realize the operation of short-circuit state latching through a simple circuit.
3. The invention is provided with the reset circuit, has a reset function and realizes reset without power failure of the whole set of system.
4. Because the protection circuit is provided with a plurality of protection circuits, each protection circuit is connected with the corresponding power supply module sequentially through the current detection unit, the current comparison unit, the control unit and the relay, the power supply module with the short circuit can be protected in the parallel power supply module, and other paths are not influenced.
In summary, the invention can be widely applied to the field of protection of the parallel power supply module 6.
Drawings
Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like reference numerals refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of a short-circuit protection system for parallel power modules according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a protection circuit according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
The short-circuit protection system and method for the parallel power supply modules are used for short-circuit protection of the power supply system of the parallel power supply modules and can ensure that the power supply system can still normally work after a certain branch is short-circuited. When a short circuit occurs at the front end of a certain power supply module, the current detection unit sends a current sampling value to the current comparison unit, the current comparison unit gives a current comparison signal through comparison, and the control unit controls the relay to disconnect the branch circuit according to the current comparison signal and a control signal output by the single chip microcomputer, so that other branch circuits can normally operate, and further the whole power supply system can normally work.
Example 1
As shown in fig. 1, the embodiment provides a short-circuit protection system for parallel power modules, which includes a single chip microcomputer and a plurality of protection circuits 1, wherein each protection circuit 1 includes a current detection unit 2, a current comparison unit 3, a control unit 4, and a relay 5.
One end of each current detection unit 2 is connected with the input end of the power supply system, the other end of each current detection unit 2 is connected with one path of power supply module 6 in the power supply system through a corresponding current comparison unit 3, a control unit 4 and a relay 5 in sequence, and the single chip microcomputer is connected with each control unit 4.
The singlechip is used for outputting a control signal to the control unit 4 according to a control instruction sent by the upper computer.
The current detection unit 2 is configured to detect a current sampling value of a circuit in which the corresponding power module 6 is located, and send the current sampling value to the current comparison unit 3.
The current comparing unit 3 is configured to compare the current sampling value with the current setting value to obtain a current comparison signal, and send the current comparison signal to the control unit 4.
The control unit 4 is used for performing and operation on the current comparison signal and the control signal output by the single chip microcomputer, and outputting a control level to the corresponding relay 5.
The relay 5 is used for controlling the on-off of the circuit where the corresponding power supply module 6 is located based on the control level output by the control unit 4.
In practical application, when the whole power supply system works, a current sampling value detected by the current detection unit 2 of a circuit where each power supply module 6 is located is compared with a current set value preset by the current comparison unit 3, if the circuit works normally, the current sampling value is lower than the current set value, the control unit 4 outputs a control level to the relay 5 to control the relay 5 to be switched on, the corresponding power supply module 6 works normally, if the circuit is short-circuited at the front end, the current sampling value is larger than the current set value, and the control unit 4 outputs the control level to the relay 5 to control the relay 5 to be switched off, so that the circuit is switched off, and the normal operation of other circuits is guaranteed.
In a preferred embodiment, the current detection unit 2 selects a module matched with an actual current sampling value, and when the module is too small, the function cannot be realized, and when the module is too large, the precision cannot be ensured. Specifically, the current detection unit 2 may employ a current sensing chip of a hall effect.
In a preferred embodiment, the control signal output by the single chip microcomputer is the high-low level of IO. The upper computer outputs a control instruction to the single chip microcomputer, the single chip microcomputer outputs a high level or a low level to the control unit 4 according to the control instruction of the upper computer, the high level is output when the single chip microcomputer is switched on, and the low level is output when the single chip microcomputer is switched off. In the current comparing unit 3, the current sampling value is compared with a current preset value, and a current comparison signal, i.e. a high level or a low level, is output. The control unit 4 performs and gate calculation on the control signal output by the single chip microcomputer and the current comparison signal output by the current comparison unit 3, if a high level is output, the relay 5 is switched on, and if a low level is output, the relay 5 is switched off.
The present invention is illustrated schematically in the selection of one of the logical combinations shown in fig. 2.
In a preferred embodiment, each current comparing unit 3 comprises a comparator 31 and a diode 32, the comparator 31 is configured to output a current comparing signal, i.e. high level or low level, to the control unit 4 according to the current sampling value and the current setting value; the diode 32 is used to ensure that the output voltage of the comparator 31 does not become high when the relay 5 opens the circuit in which the corresponding power supply module 6 is located.
In a preferred embodiment, each protection circuit 1 further includes a reset circuit 7, each reset circuit 7 is connected to the single chip, and the reset circuit 7 is configured to reset a circuit in which the corresponding power module 6 is located. When reset is needed, the single chip outputs a reset control signal (i.e. the high and low levels of IO) to the reset circuit 7, and reset of the protection function can be realized without restarting the whole power supply system.
In a preferred embodiment, each protection circuit 1 further includes a voltage dividing unit 8, the voltage dividing unit 8 includes a first voltage dividing resistor 81 and a second voltage dividing resistor 82, the first voltage dividing resistor 81 and the second voltage dividing resistor 82 are configured to divide the voltage of the power supply system to a predetermined voltage according to a certain proportion and send the voltage to the current comparing unit 3, and this voltage is a rated value of the short-circuit protection.
In a preferred embodiment, in a protection circuit 1, one end of a reset circuit 7 is connected to an input terminal of a power supply system, the other end of the reset circuit 7 is connected in parallel to a first input terminal of a comparator 31 and one end of a second voltage-dividing resistor 82 through a first voltage-dividing resistor 81, a second input terminal of the comparator 31 is connected to a current detection unit 2, an output terminal of the comparator 31 is connected in parallel to an input terminal of a control unit 4 and a negative terminal of a diode 32, and a positive terminal of the diode 32 and the other end of the second voltage-dividing resistor 82 are respectively connected to ground. The output end of the control unit 4 is connected with the input end of the relay 5, and the output end of the relay 5 is connected with the corresponding power supply module 6.
In a preferred embodiment, the reset circuit 7 employs a 5V reset circuit.
Example 2
The embodiment provides a short-circuit protection method for parallel power supply modules, which comprises the following steps:
1) In the power supply system, the current detection unit 2 of each protection circuit 1 detects a current sampling value of a circuit in which the corresponding power supply module 6 is located, and sends the current sampling value to the corresponding current comparison unit 3.
2) The current comparison unit 3 of each protection circuit 1 compares the received current sampling value with a preset current setting value to obtain a current comparison signal and sends the current comparison signal to the corresponding control unit 4, specifically:
2.1 Current set value is obtained in advance by the current comparing unit 3 of each protection circuit 1.
2.2 The current comparing unit 3 of each protection circuit 1 receives the current sampling value sent by the corresponding current detecting unit 2, compares the received current sampling value with the current set value, and outputs a current comparing signal to the control unit 4.
Specifically, under a normal working condition, the current sampling value is smaller than the current set value, and the current comparison unit 3 outputs a high level to the control unit 4; when the circuit is short-circuited, the current sampling value is larger than the current set value, and the current comparison unit 3 outputs a low level to the control unit 4.
3) The control unit 4 of each protection circuit 1 performs and operation on the current comparison signal output by the corresponding current comparison unit 3 and the control signal output by the single chip microcomputer, and outputs a control level to the corresponding relay 5.
Specifically, the control signal output by the single chip microcomputer is determined by the upper computer.
Specifically, when no overcurrent condition occurs, the current comparison unit 3 outputs a high level, if the relay 5 is required to be turned on, the upper computer sends a control instruction, the single chip microcomputer outputs the high level, the control unit 4 performs and gate operation on the high level output by the single chip microcomputer and the high level output by the current comparison unit 3, and the control unit 4 outputs the high level to turn on the relay 5. If the relay 5 is required to be turned off, the upper computer sends a control instruction, the single chip microcomputer outputs a low level, the control unit 4 performs AND gate operation on the low level output by the single chip microcomputer and the high level output by the current comparison unit 3, and the control unit 4 outputs a low level to turn off the relay 5.
Specifically, when an overcurrent condition occurs, the current comparison unit 3 outputs a low level, and no matter the relay 5 is required to be turned on and off, the upper computer sends a control instruction, the single chip microcomputer outputs a high level or a low level, the control unit 4 performs an and gate operation on the high level or the low level output by the single chip microcomputer and the low level output by the current comparison unit 3, and the control unit 4 can only output the low level to turn off the relay 5. At this time, the current decreases, the current sampling value decreases, and the comparator 31 of the current comparing unit 3 generates a tube voltage drop voltage of about 0.7V at the first input end through the diode 32, so as to ensure that the output voltage of the comparator 31 does not become high and is still at a low level, thereby ensuring the disconnection of the relay 5.
4) The relay 5 of each protection circuit 1 controls the on-off of the circuit where the corresponding power module 6 is located based on the control level output by the corresponding control unit 4.
5) The voltage dividing unit 8 divides the voltage of 5V to a preset voltage according to a certain proportion and sends the voltage to the current comparing unit 3, and the voltage can calculate the current value of the short-circuit protection according to a certain conversion proportion.
6) The reset circuit 7 controls the on-off of the 5V power supply of the whole system through a reset control signal, namely an IO level, output by the single chip microcomputer.
Specifically, under normal conditions, the reset control signal output by the single chip microcomputer is an IO high level, and the whole system works normally. When the reset is needed, the IO level is pulled down, so that the 5V power supply is disconnected, the IO level is pulled up again, the 5V power supply is recovered, the whole system is reset to the state of power-on, and the relay 5 is disconnected at the moment.
The above embodiments are only used for illustrating the present invention, and the structure, connection mode, manufacturing process, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.
Claims (10)
1. A short-circuit protection system for parallel power supply modules is characterized by comprising a single chip microcomputer and a plurality of protection circuits, wherein each protection circuit corresponds to a certain power supply module in a power supply system and comprises a current detection unit, a current comparison unit, a control unit and a relay;
the single chip microcomputer is used for outputting a control signal to each control unit according to the requirement of switching on or switching off the relay;
the current detection unit is used for detecting a current sampling value corresponding to a circuit where the power supply module is located;
the current comparison unit is used for comparing a current sampling value detected by the corresponding current detection unit with a current set value to obtain a current comparison signal;
the control unit is used for performing AND operation on the current comparison signal and the control signal output by the singlechip and outputting a control level;
the relay is used for controlling the on-off of a circuit corresponding to the power supply module based on the control level output by the control unit.
2. The system of claim 1, wherein each of the protection circuits further comprises a voltage divider for dividing a voltage of the power system to a predetermined voltage according to a certain ratio and sending the divided voltage to the current comparator.
3. The parallel power module short-circuit protection system of claim 2, wherein each protection circuit further comprises a reset circuit, each reset circuit is respectively connected with the single chip microcomputer, and the reset circuit is used for resetting a circuit corresponding to the power module.
4. The system of claim 3, wherein each of the current comparing units comprises a comparator and a diode, the comparator is configured to output a current comparing signal to the control unit according to a current sampling value and a current setting value, and the diode is configured to ensure that an output voltage of the comparator does not become high when the relay disconnects a circuit corresponding to the power module.
5. The short-circuit protection system of claim 4, wherein in one of the protection circuits, one end of the reset circuit is connected to an input terminal of a power system, the other end of the reset circuit is connected in parallel to a first input terminal of the comparator and one end of a second voltage-dividing resistor of the voltage-dividing unit through a first voltage-dividing resistor of the voltage-dividing unit, a second input terminal of the comparator is connected to the current detection unit, an output terminal of the comparator is connected in parallel to an input terminal of the control unit and a negative terminal of the diode, and a positive terminal of the diode and the other end of the second voltage-dividing resistor are respectively grounded; the output end of the control unit is connected with the input end of the relay, and the output end of the relay is connected with the power supply module correspondingly.
6. A short-circuit protection method for parallel power supply modules is characterized by comprising the following steps:
in the power supply system, a current detection unit of each protection circuit detects a current sampling value of a circuit where a corresponding power supply module is located and sends the current sampling value to a corresponding current comparison unit;
the current comparison unit of each protection circuit compares the received current sampling value with a preset current set value to obtain a current comparison signal and sends the current comparison signal to the corresponding control unit;
the control unit of each protection circuit performs AND operation on the current comparison signal output by the corresponding current comparison unit and the control signal output by the single chip microcomputer, and outputs a control level to the corresponding relay;
and the relay of each protection circuit controls the on-off of the circuit where the corresponding power supply module is based on the control level output by the corresponding control unit.
7. The method as claimed in claim 6, wherein the step of comparing the received current sampling value with the preset current setting value by the current comparing unit of each protection circuit to obtain a current comparison signal, and sending the current comparison signal to the corresponding control unit comprises the steps of:
a current comparison unit of each protection circuit obtains a current set value in advance;
the current comparison unit of each protection circuit receives the current sampling value sent by the corresponding current detection unit, compares the received current sampling value with the current set value, and outputs a current comparison signal to the control unit.
8. The method according to claim 7, wherein the step of receiving the current sampling value sent by the corresponding current detecting unit by the current comparing unit of each protection circuit, comparing the received current sampling value with the current setting value, and outputting the current comparing signal to the control unit comprises:
under the normal working condition, the current sampling value is smaller than the current set value, and the current comparison unit outputs a high level to the control unit; when the circuit is in short circuit, the current sampling value is larger than the current set value, and the current comparison unit outputs a low level to the control unit.
9. The short-circuit protection method of the parallel power supply modules according to claim 8, wherein the control unit of each protection circuit performs and operation on the current comparison signal output by the corresponding current comparison unit and the control signal output by the single chip microcomputer, and outputs a control level to the corresponding relay, and the method comprises:
when no overcurrent condition occurs, the current comparison unit outputs a high level, if the relay is required to be switched on, the single chip microcomputer outputs the high level, the control unit performs AND gate operation on the high level output by the single chip microcomputer and the high level output by the current comparison unit, and the control unit outputs the high level to switch on the relay; if the relay is required to be turned off, the single chip microcomputer outputs a low level, the control unit performs AND gate operation on the low level output by the single chip microcomputer and the high level output by the current comparison unit, and the control unit outputs a low level to turn off the relay;
when an overcurrent condition occurs, the current comparison unit outputs a low level, the single chip microcomputer outputs a high level or a low level no matter the relay is required to be switched on and switched off, the control unit performs AND gate operation on the high level or the low level output by the single chip microcomputer and the low level output by the current comparison unit, and the control unit only outputs the low level to switch off the relay.
10. The method of claim 6, further comprising;
the reset circuit controls the on-off of the power supply of the whole system through a reset control signal output by the singlechip.
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| CN202210984972.3A CN115377935A (en) | 2022-08-17 | 2022-08-17 | Short-circuit protection system and method for parallel power supply modules |
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| CN202210984972.3A CN115377935A (en) | 2022-08-17 | 2022-08-17 | Short-circuit protection system and method for parallel power supply modules |
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