CN114447888B - Overcurrent protection circuit and method for multi-path parallel DC/DC boost converter for aerospace - Google Patents

Overcurrent protection circuit and method for multi-path parallel DC/DC boost converter for aerospace Download PDF

Info

Publication number
CN114447888B
CN114447888B CN202210020344.3A CN202210020344A CN114447888B CN 114447888 B CN114447888 B CN 114447888B CN 202210020344 A CN202210020344 A CN 202210020344A CN 114447888 B CN114447888 B CN 114447888B
Authority
CN
China
Prior art keywords
voltage
module
boost converter
resistor
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202210020344.3A
Other languages
Chinese (zh)
Other versions
CN114447888A (en
Inventor
王乾同
程新
季晨
柴万腾
郭菲
陈鑫玉
范巍岩
李强
许祺峰
王国军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Institute of Space Power Sources
Original Assignee
Shanghai Institute of Space Power Sources
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Institute of Space Power Sources filed Critical Shanghai Institute of Space Power Sources
Priority to CN202210020344.3A priority Critical patent/CN114447888B/en
Publication of CN114447888A publication Critical patent/CN114447888A/en
Application granted granted Critical
Publication of CN114447888B publication Critical patent/CN114447888B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • H02H7/1213—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 for DC-DC converters
    • 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
    • H02H3/02—Details
    • H02H3/027—Details with automatic disconnection after a predetermined time
    • 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
    • H02H3/087—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 for dc applications
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • H02M3/1584—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 with a plurality of power processing stages connected in parallel

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses an over-current protection circuit and method for a multipath parallel DC/DC boost converter for aerospace. The circuit is characterized by comprising: the DC/DC boost converter comprises a DC/DC boost converter, a load, a diode, a MOS tube, a current sensor, a voltage comparison module, a current comparison module, a logic selection module, a delay module and a driving module. The voltage comparison module acquires the voltage difference between the input of the DC/DC boost converter and the load end, compares the voltage difference with the voltage value of the first voltage source, and outputs high level or low level; the current comparison module acquires the voltage of the current sensor, compares the voltage of the current sensor with the voltage value of the second voltage source, and outputs a high level or a low level; the logic selection module generates an output level to the delay module according to the input level; the driving module is used for being acted by the delay module to generate the MOS tube driving signal. The circuit is simple, low in cost and capable of accurately judging the overcurrent point and automatically realizing different circuit breaking protection methods according to different overcurrent points.

Description

Overcurrent protection circuit and method for multi-path parallel DC/DC boost converter for aerospace
Technical Field
The invention belongs to the technical field of power electronic technology application, and relates to an over-current protection circuit and method for a multi-path parallel DC/DC boost converter for aerospace.
Background
The multipath parallel DC/DC boost converter is widely used in the field of aerospace power supply systems, and can maintain the voltage of a bus at a load end after one path of converter fails, so that the reliability of the power supply system is greatly improved. The over-current protection of the traditional DC/DC boost converter converts bus current into voltage signals, the voltage signals are compared with corresponding over-current voltage signals through a voltage comparator, and when the bus current is overlarge, a protection switch tube connected in series in a system is disconnected to achieve the purpose of breaking protection, but the method can not accurately judge the position of an over-current point of the system.
For a multiple parallel DC/DC boost converter system, when a short circuit occurs on the external load side, the proper over-current protection method should be by blowing the fuses of the current load, rather than opening the protection switching tubes of all DC/DC boost converters, which in turn causes all loads to be powered down. When a short circuit occurs in the DC/DC boost converter, a proper overcurrent protection method is to immediately disconnect a protection switching tube of the current DC/DC boost converter, and other converters connected in parallel normally work to maintain the normal operation of the load.
CN201911043192.3 discloses an overcurrent protection method for generating an overcurrent protection threshold by using a processor, but because of the restriction of a hardware circuit and a space environment, an aerospace power supply system is difficult to realize the overcurrent protection method of a singlechip such as the processor. CN201420849539.X discloses a method for realizing overcurrent protection by utilizing a hardware circuit, wherein an overcurrent protection threshold is configured through a voltage dividing resistor to achieve the aim of overcurrent protection, but the method is only aimed at a single-path power supply circuit, and cannot accurately judge and realize accurate overcurrent protection for complex overcurrent conditions of power supply circuits of multiple paths of parallel and multiple paths of loads.
Disclosure of Invention
The invention provides a high-reliability overcurrent protection method and a circuit, which are used for solving the problem of inaccurate judgment of an overcurrent point in a multipath parallel DC/DC boost converter and realizing effective overcurrent protection.
Specifically, the invention provides an over-current protection circuit of a multi-path parallel DC/DC boost converter for aerospace, which is characterized by comprising the following components: the DC/DC boost converter comprises a DC/DC boost converter, a load, a diode, a MOS tube, a current sensor, a voltage comparison module, a current comparison module, a logic selection module, a delay module and a driving module;
The DC/DC boost converters are multiple, each DC/DC boost converter input end is connected with an MOS tube and a current sensor in series, each DC/DC boost converter output end is connected with a diode in series, and then the multiple paths are connected with a load in parallel,
The voltage comparison module acquires the voltage difference between the input of the DC/DC boost converter and the load end, compares the voltage difference with the voltage value of the first voltage source, and outputs high level or low level;
the current comparison module acquires the voltage of the current sensor, compares the voltage of the current sensor with the voltage value of the second voltage source, and outputs a high level or a low level;
the logic selection module generates an output level to the delay module according to the input level;
The delay module delays the level signal output by the logic selection module and outputs the level signal to the driving module;
The driving module is used for being acted by the delay module to generate the MOS tube driving signal.
Further, the difference value between the load terminal voltage and the input voltage of the DC/DC boost converter under the normal working condition is a first voltage reference value; the current sensor generates a voltage value as a second voltage reference value under the action of input current under the normal working condition of the DC/DC boost converter; the current sensor generates a second voltage signal under the input current of the DC/DC boost converter.
Further, the voltage comparison module comprises a differential amplifying circuit, a first voltage comparator and a first voltage source; the differential amplifying circuit outputs a first voltage signal under the action of the input voltage of a load end and the input voltage difference of the DC/DC boost converter; the positive end of the first voltage comparator receives a first voltage signal, and the negative end of the first voltage comparator is connected with the positive end of the first voltage source; the negative end of the first voltage source is connected with the ground; the output end of the first voltage comparator is connected with the first input end of the logic comparison module.
Further, the differential amplifying circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor and an operational amplifier;
the diode cathode is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the ground, and the non-inverting input end of the operational amplifier is connected with the second end of the first resistor;
The input positive end of the DC/DC boost converter is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the output end of the operational amplifier, and the inverting input end of the operational amplifier is connected with the second end of the third resistor;
The first resistance value is equal to the third resistance and is R 1, and the second resistance value is equal to the fourth resistance and is R 2.
Further, the current comparison module comprises a second voltage comparator and a second voltage source; the positive end of the second voltage comparator receives the voltage signal of the current sensor, and the negative end of the second voltage comparator is connected with the positive end of the second power supply; the negative end of the second voltage source is connected with the ground; the output end of the second voltage comparator is connected with the second input end of the logic selection module, and the voltage value of the second voltage source is set to be 1.5 times of a second voltage reference value.
Further, the delay module comprises an external overcurrent circuit and an internal overcurrent circuit, the external overcurrent circuit and the internal overcurrent circuit receive the output voltage signal of the logic selection module,
The logic selection module receives the output level signal of the voltage comparison module and the output level signal of the current comparison module, and when the two level signals are both high levels, the logic selection module gates an internal through-current circuit and outputs high levels; when the voltage comparison module outputs a low-level signal, the current comparison module outputs a high-level signal, and the logic selection module gates an external through-current circuit and outputs a high level; otherwise the logic selection modules all output low levels.
Further, the external overcurrent circuit includes: a fifth resistor R 3, a capacitor, a third voltage source and a third voltage comparator; the first end of the fifth resistor is connected with the first output end of the logic selection module, the second end of the fifth resistor is connected with the first end of the capacitor, and the second end of the capacitor is connected with the ground; the positive end of the third voltage comparator is connected with the second end of the fifth resistor, and the negative end of the third voltage comparator is connected with the positive end of the third voltage source; the negative end of the third power supply is connected with the ground; the output of the third power supply comparator is connected with the first input end of the driving module; the internal overcurrent circuit directly connects the second output end of the logic selection module with the second input end of the driving circuit.
Further, the driving module receives two paths of signals output by the delay module; when any path is high level, the driving module cuts off the MOS tube; when the two paths of signals are in low level, the driving module is connected with the MOS tube.
Further, the voltage value of the first voltage source is set to be 1.5R 2/R1 times the first voltage reference value.
The invention also provides an over-current protection method of the multi-path parallel DC/DC boost converter for aerospace, which is characterized in that the over-current protection circuit of the multi-path parallel DC/DC boost converter for aerospace is used, and a voltage first voltage signal V 1 and a second voltage signal V 2 are acquired through the voltage comparison module and the current comparison module, so that the condition that the second voltage signal V 2 is larger than a voltage value V ref2 of a second voltage source is satisfied: 1) When the first voltage signal V 1 is larger than the first voltage source voltage value V ref1, the MOS tube is disconnected for overcurrent protection after the delay time t; 2) When the first voltage signal V 1 is smaller than the first voltage source voltage value V ref1, the MOS tube is directly disconnected for overcurrent protection.
The invention provides a solution for the overcurrent protection of the multipath parallel DC/DC boost circuit, has simple circuit and low cost, accurately judges the overcurrent point, and automatically realizes different open circuit protection methods according to different overcurrent points.
Drawings
FIG. 1 is a schematic diagram of an over-current protection circuit for a multi-path parallel DC/DC boost converter for aerospace.
Fig. 2 is a flow chart of the method for protecting the over-current of the multi-path parallel DC/DC boost converter for aerospace.
Detailed Description
The present invention will be further described with reference to the drawings and the specific embodiments.
The invention determines the input-output voltage difference of the DC/DC boost converter through the differential amplifying circuit, compares the input-output voltage difference with a reference value through the voltage comparison circuit, outputs a high level or a low level, compares the voltage value of the current sensor with an overcurrent protection threshold through the current comparison circuit, outputs the high level or the low level, selects an external overcurrent circuit and an internal overcurrent circuit according to the input level through the logic selection module, outputs the high level, and finally is used for driving the serial MOS tube through the driving circuit.
The invention discloses an over-current protection circuit of a multipath parallel DC/DC boost converter for aerospace, which comprises: the DC/DC boost converter comprises a DC/DC boost converter, a diode, a load, a serial MOS tube, a current sensor, a voltage comparison module, a current comparison module, a logic selection module, a delay module and a driving module.
Fig. 1 shows a high reliability over-current protection circuit for aerospace, comprising: the DC/DC boost converter comprises a DC/DC boost converter, a load, a serial MOS tube, a current sensor, a voltage comparison module, a current comparison module, a logic selection module, a delay module and a driving module.
As shown in fig. 1, the DC/DC topology is a boost converter. The DC/DC boost converters are multiple and are output to a load end through multiple paths of parallel connection. And after the output end of each DC/DC boost converter is connected with a diode in series, the multiple paths of the DC/DC boost converters are connected with a load in parallel. The function of the current sensor is as follows: the input current of the DC/DC boost converter is converted to a second voltage signal. As an alternative embodiment, the current sensor is a hall element. By adopting the embodiment of the invention, the input current signal of the DC/DC boost converter can be converted into the output voltage signal, and the converter circuit is not influenced.
The difference between the load terminal voltage and the DC/DC boost converter input voltage under normal working conditions is a first voltage reference value. The current sensor generates a voltage value as a second voltage reference value under the action of input current under the normal working condition of the DC/DC boost converter. The voltage comparison module collects the voltage difference between the input of the DC/DC boost converter and the load end, compares the voltage difference with the voltage value of the first voltage source, and outputs high level or low level. The voltage comparison module comprises a differential amplifying circuit, a first voltage comparator and a first voltage source; the differential amplifying circuit outputs a first voltage signal under the action of the input and output voltage difference of the DC/DC boost converter (namely, the input voltage of a load end and the input voltage difference of the DC/DC boost converter); the positive end of the first voltage comparator is connected with the output of the differential amplifying circuit (namely the first voltage signal), and the negative end of the first voltage comparator is connected with the positive end of the first voltage source; the negative end of the first voltage source is connected with the ground. The output end of the first voltage comparator is connected with the first input end of the logic selection module.
The voltage comparison module has three possible situations:
1) The system operates normally, the first voltage signal voltage is larger than the first voltage source output voltage, and the first voltage comparator outputs a high level.
2) The positive bus and the negative bus inside the DC/DC boost converter are short-circuited, the input voltage of the load end is maintained by other parallel DC/DC boost circuits, the voltage of the first voltage signal is larger than the output voltage of the first voltage source, and the first voltage comparator outputs a high level.
3) The external load end positive and negative buses are short-circuited, the input voltage of the load end is reduced, the voltage of the first voltage signal is smaller than the output voltage of the first voltage source, and the first voltage comparator outputs a low level.
As an alternative embodiment, the voltage value of the first voltage source may be set to 1.5R 2/R1 times the first voltage reference value. By adopting the implementation of the invention, three conditions of the voltage comparison module can be realized. As an alternative embodiment, the voltage value of the second voltage source may be set to 1.5 times the second voltage reference value.
As an alternative embodiment, the differential amplifying circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and an operational amplifier; the diode cathode is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the ground, and the non-inverting input end of the operational amplifier is connected with the second end of the first resistor; the input positive end of the DC/DC boost converter is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the ground, and the inverting input end of the operational amplifier is connected with the second end of the third resistor; the first resistance value is equal to the third resistance and is R 1, and the second resistance value is equal to the fourth resistance and is R 2.
With the above embodiment of the present invention, since the input impedance of the operational amplifier is large, the influence on the DC/DC boost converter loop is small, and the output voltage gain is adjustable. The differential amplifying circuit input/output voltage gain Av is:
The current comparison module collects the voltage of the current sensor, compares the voltage of the current sensor with the voltage value of the second voltage source, and outputs a high level or a low level. In one embodiment, the current comparison module includes a second voltage comparator and a second voltage source; the positive end of the second voltage comparator receives the voltage signal of the current sensor, and the negative end of the second voltage comparator is connected with the positive end of the second power supply; the negative end of the second voltage source is connected with the ground; the output end of the second voltage comparator is connected with the second input end of the logic selection module. The second voltage source output voltage value is equal to an over-current protection threshold value (over-current protection voltage limit value).
The current comparison module has three possible situations:
1) The system operates normally, the voltage of the second voltage signal is smaller than the output voltage of the second voltage source, and the second voltage comparator outputs a low level.
2) The positive bus and the negative bus inside the DC/DC boost converter are short-circuited, the voltage of the second voltage signal is larger than the output voltage of the second voltage source, and the second voltage comparator outputs a high level.
3) The external load end positive and negative buses are short-circuited, the voltage of the second voltage signal is larger than the output voltage of the second voltage source, and the second voltage comparator outputs a high level.
As an alternative embodiment, the voltage of the second voltage source may be set to 1.5 times the second voltage reference value. By adopting the implementation of the invention, three conditions of the current comparison module can be realized.
The logic selection module generates an output level to the delay module according to the input level. The logic selection module receives the output level signal of the voltage comparison module and the output level signal of the current comparison module, and when the two level signals are both high levels, the logic selection module gates an internal through-current circuit and outputs high levels; when the voltage comparison module outputs a low-level signal, the current comparison module outputs a high-level signal, and the logic selection module gates an external through-current circuit and outputs a high level; otherwise the logic selection modules all output low levels.
Specifically, the logic selection module has three possible scenarios in total:
1) The system operates normally, the voltage comparison module outputs a high-level signal, the current comparison module outputs a low-level signal, and the logic selection module receives the signals and outputs low levels to the external overcurrent circuit and the internal overcurrent circuit;
2) The DC/DC boost converter comprises a DC/DC boost converter, a current comparison module, a logic selection module, a voltage comparison module and an external overcurrent circuit, wherein the DC/DC boost converter is internally provided with positive and negative buses for short circuit, the voltage comparison module outputs a high-level signal, the current comparison module inputs a low-level signal, the logic selection module receives the signal and outputs a low level to the external overcurrent circuit, and the logic selection module outputs a high level to the internal overcurrent circuit;
3) The external load end positive and negative buses are short-circuited, the voltage comparison module outputs a low-level signal, the current comparison module inputs a high-level signal, the logic selection module receives the signal and outputs a high level to the external overcurrent circuit, and the logic selection module outputs a low level to the internal overcurrent circuit.
The delay module delays the level signal output by the logic selection module and outputs the level signal to the driving module. The delay module includes an external overcurrent circuit and an internal overcurrent circuit. And the external overcurrent circuit and the internal overcurrent circuit receive the output voltage signal of the logic selection module and generate a signal for controlling the MOS tube.
As an alternative embodiment, the external overcurrent circuit includes a fifth resistor R 3, a capacitor, a third voltage source, and a third voltage comparator; the first end of the fifth resistor is connected with the first output end of the logic selection module, the second end of the fifth resistor is connected with the first end of the capacitor, and the second end of the capacitor is connected with the ground; the positive end of the third voltage comparator is connected with the second end of the fifth resistor, and the negative end of the third voltage comparator is connected with the positive end of the third voltage source; and the negative end of the third power supply is connected with the ground, and the output of the third power supply comparator is connected with the first input end of the driving module. The third voltage source voltage value may be set to 0.9 times the high level voltage.
By adopting the embodiment of the invention, when the positive bus and the negative bus of the external load end are short-circuited, the external overcurrent circuit receives a high level, and after the output of the RC circuit reaches 0.9 times of the output voltage value of the third voltage source, the high level is output to control the driving module to disconnect the MOS tube through the delay of the RC circuit. The delay effect of the external overcurrent circuit is: when the external load end positive and negative bus is short-circuited, the fuse at the load side is firstly fused, and the load of the current short-circuit is cut off. If the MOS tube is directly disconnected for breaking protection, all loads cannot work normally. Therefore, the MOS tube circuit-breaking protection operation time should be equal to the delay time of the external overcurrent circuit after the fuse is operated. The delay time t satisfies the following equation:
As an alternative embodiment, the internal overcurrent circuit connects the second output of the logic selection module directly to the second input of the drive circuit. By adopting the embodiment of the invention, when the positive bus and the negative bus in the DC/DC boost converter are short-circuited, the logic selection module controls the driving module to disconnect the MOS tube without delay.
The driving module is used for being acted by the delay module to generate the MOS tube driving signal. In one embodiment, the driving module functions as: after receiving the high-level signal, a driving signal is generated to control the MOS tube to be turned off, so that overcurrent protection is realized. Specifically, the driving module receives two paths of signals output by the delay module; when any path is high level, the driving module cuts off the MOS tube; when the two paths of signals are in low level, the driving module is connected with the MOS tube. In other words, when any one of the first input end and the second input end of the driving module is at a high level, the driving module disconnects the MOS tube; when the two paths of signals are at a low level, the driving module is connected with the MOS tube.
Fig. 2 is a flow chart of the method for protecting the over-current of the multi-path parallel DC/DC boost converter for aerospace. As shown in fig. 2, the voltage comparison module and the current comparison module collect the first voltage signal V 1 and the second voltage signal V 2. Under the condition that the second voltage signal V 2 is greater than the second voltage source voltage value V ref2: 1) When the first voltage signal V 1 is larger than the first voltage source voltage value V ref1, the MOS tube is disconnected for overcurrent protection after the delay time t; 2) When the first voltage signal V 1 is smaller than the first voltage source voltage value V ref1, the MOS tube is directly disconnected for overcurrent protection.
In the several embodiments provided in the present application, it should be understood that the disclosed technical content may be implemented in other manners. Finally, the embodiments described above are merely illustrative, for example, the various circuits and devices described may be combined or integrated into another circuit, or some devices may be omitted, or some devices may be added.

Claims (5)

1. An over-current protection circuit for a multi-path parallel DC/DC boost converter for aerospace, comprising: the DC/DC boost converter, a load, a diode, a MOS tube, a current sensor, a voltage comparison module, a current comparison module, a logic selection module, a delay module and a driving module,
The DC/DC boost converters are multiple, each DC/DC boost converter input end is connected with an MOS tube and a current sensor in series, each DC/DC boost converter output end is connected with a diode in series, and then the multiple paths are connected with a load in parallel,
The voltage comparison module acquires the voltage difference between the input of the DC/DC boost converter and the load end, compares the voltage difference with the voltage value of the first voltage source, and outputs high level or low level;
the current comparison module acquires the voltage of the current sensor, compares the voltage of the current sensor with the voltage value of the second voltage source, and outputs a high level or a low level;
the logic selection module generates an output level to the delay module according to the input level;
The delay module delays the level signal output by the logic selection module and outputs the level signal to the driving module;
The driving module is used for being acted by the delay module to generate the MOS tube driving signal,
The voltage comparison module comprises a differential amplifying circuit, a first voltage comparator and a first voltage source; the differential amplifying circuit outputs a first voltage signal under the action of the input voltage of a load end and the input voltage difference of the DC/DC boost converter; the positive end of the first voltage comparator receives a first voltage signal, and the negative end of the first voltage comparator is connected with the positive end of the first voltage source; the negative end of the first voltage source is connected with the ground; the output end of the first voltage comparator is connected with the first input end of the logic comparison module,
The differential amplifying circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor and an operational amplifier;
the diode cathode is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the ground, and the non-inverting input end of the operational amplifier is connected with the second end of the first resistor;
The input positive end of the DC/DC boost converter is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the output end of the operational amplifier, and the inverting input end of the operational amplifier is connected with the second end of the third resistor;
The first resistance is equal to the third resistance in R 1, the second resistance is equal to the fourth resistance in R 2,
The current comparison module comprises a second voltage comparator and a second voltage source; the positive end of the second voltage comparator receives the voltage signal of the current sensor, and the negative end of the second voltage comparator is connected with the positive end of the second power supply; the negative end of the second voltage source is connected with the ground; the output end of the second voltage comparator is connected with the second input end of the logic selection module, the voltage value of the second voltage source is set to be 1.5 times of a second voltage reference value,
The delay module comprises an external overcurrent circuit and an internal overcurrent circuit, the external overcurrent circuit and the internal overcurrent circuit receive the output voltage signals of the logic selection module,
The logic selection module receives the output level signal of the voltage comparison module and the output level signal of the current comparison module, and when the two level signals are both high levels, the logic selection module gates an internal through-current circuit and outputs high levels; when the voltage comparison module outputs a low-level signal, the current comparison module outputs a high-level signal, and the logic selection module gates an external through-current circuit and outputs a high level; the logic selection modules output low levels in other cases,
The external overcurrent circuit includes: a fifth resistor R 3, a capacitor, a third voltage source and a third voltage comparator; the first end of the fifth resistor is connected with the first output end of the logic selection module, the second end of the fifth resistor is connected with the first end of the capacitor, and the second end of the capacitor is connected with the ground; the positive end of the third voltage comparator is connected with the second end of the fifth resistor, and the negative end of the third voltage comparator is connected with the positive end of the third voltage source; the negative end of the third power supply is connected with the ground; the output of the third power supply comparator is connected with the first input end of the driving module; the internal overcurrent circuit directly connects the second output end of the logic selection module with the second input end of the driving circuit.
2. The aerospace multi-path parallel DC/DC boost converter overcurrent protection circuit of claim 1, wherein a difference between the load terminal voltage and the DC/DC boost converter input voltage under normal operating conditions is a first voltage reference value; the current sensor generates a voltage value as a second voltage reference value under the action of input current under the normal working condition of the DC/DC boost converter; the current sensor generates a second voltage signal under the input current of the DC/DC boost converter.
3. The aerospace multi-path parallel DC/DC boost converter overcurrent protection circuit according to claim 1, wherein the driving module receives two paths of signals output by the delay module; when any path is high level, the driving module cuts off the MOS tube; when the two paths of signals are in low level, the driving module is connected with the MOS tube.
4. The aerospace multi-path parallel DC/DC boost converter overcurrent protection circuit of claim 1, wherein the voltage value of the first voltage source is set to 1.5R 2/R1 times the first voltage reference value.
5. The overcurrent protection method for the multi-path parallel DC/DC boost converter for aerospace is characterized in that the overcurrent protection circuit for the multi-path parallel DC/DC boost converter for aerospace is used, and a first voltage signal V 1 and a second voltage signal V 2 are acquired through the voltage comparison module and the current comparison module, so that the condition that the second voltage signal V 2 is larger than a second voltage source voltage value V ref2 is satisfied: 1) When the first voltage signal V 1 is larger than the first voltage source voltage value V ref1, the MOS tube is disconnected for overcurrent protection after the delay time t; 2) When the first voltage signal V 1 is smaller than the first voltage source voltage value V ref1, the MOS tube is directly disconnected for overcurrent protection.
CN202210020344.3A 2022-01-10 2022-01-10 Overcurrent protection circuit and method for multi-path parallel DC/DC boost converter for aerospace Active CN114447888B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210020344.3A CN114447888B (en) 2022-01-10 2022-01-10 Overcurrent protection circuit and method for multi-path parallel DC/DC boost converter for aerospace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210020344.3A CN114447888B (en) 2022-01-10 2022-01-10 Overcurrent protection circuit and method for multi-path parallel DC/DC boost converter for aerospace

Publications (2)

Publication Number Publication Date
CN114447888A CN114447888A (en) 2022-05-06
CN114447888B true CN114447888B (en) 2024-06-14

Family

ID=81366987

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210020344.3A Active CN114447888B (en) 2022-01-10 2022-01-10 Overcurrent protection circuit and method for multi-path parallel DC/DC boost converter for aerospace

Country Status (1)

Country Link
CN (1) CN114447888B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117712986A (en) * 2023-12-13 2024-03-15 广州通则康威科技股份有限公司 Overcurrent protection circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103441471A (en) * 2013-08-01 2013-12-11 中国航天科技集团公司第九研究院第七七一研究所 Over-current protection circuit of three-way output DC/DC converter
CN106129997A (en) * 2016-06-24 2016-11-16 桂林航天电子有限公司 Multi-channel intelligent power distribution equipment and operation method thereof

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204304396U (en) * 2014-12-30 2015-04-29 青岛歌尔声学科技有限公司 A kind of current foldback circuit and overcurrent protective device
CN108376967A (en) * 2018-02-23 2018-08-07 扬州海通电子科技有限公司 A kind of multiple-channel output low voltage difference overcurrent protector
JP7352179B2 (en) * 2020-01-24 2023-09-28 オムロン株式会社 Overcurrent protection devices, DC/DC converter devices, and power systems
CN211880080U (en) * 2020-04-24 2020-11-06 深圳市三旺通信股份有限公司 Intrinsic safety type power supply circuit and intrinsic safety type communication network equipment
CN214479551U (en) * 2021-04-15 2021-10-22 丁子擎 Overcurrent protection circuit for parallel connection of multiple modules

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103441471A (en) * 2013-08-01 2013-12-11 中国航天科技集团公司第九研究院第七七一研究所 Over-current protection circuit of three-way output DC/DC converter
CN106129997A (en) * 2016-06-24 2016-11-16 桂林航天电子有限公司 Multi-channel intelligent power distribution equipment and operation method thereof

Also Published As

Publication number Publication date
CN114447888A (en) 2022-05-06

Similar Documents

Publication Publication Date Title
KR101155620B1 (en) Power control circuit, power supply unit, and power controller control method
US20190148931A1 (en) Ideal diode with active reverse voltage protection
US9083181B2 (en) Over-current protection circuit for light source driving module and related backlight module
US20110169458A1 (en) Battery pack
CN113098456A (en) High-performance chip state monitoring protection circuit for high-voltage integrated circuit
CN114447888B (en) Overcurrent protection circuit and method for multi-path parallel DC/DC boost converter for aerospace
JP2010200581A (en) Battery device
CN106571803A (en) Overvoltage detection circuit
CN111146928A (en) Regulating circuit and BUCK circuit
US10418952B1 (en) Amplifier with hysteresis
US7612550B2 (en) Dropper type regulator
CN115241857A (en) Power supply clamping protection circuit, chip and double-clamping protection method
CN117543509A (en) Quick self-adaptive short-circuit protection circuit and protection method for SiC MOSFET
CN112217178A (en) Reverse input protection circuit, integrated circuit chip and stabilized voltage power supply
US11496125B2 (en) Switch circuit capable of overcurrent protection with small and simple circuit, and with simple operation, without affecting normal operation
US8901918B2 (en) Load connection state detection circuit
US10498303B2 (en) Signal level detection and overrange signal limiter and clamp for electronic circuits
CN115021539A (en) Circuit structure for preventing current backflow
US11115016B2 (en) Electronic circuit with two voltage supply circuits
CN114710144A (en) Novel MOS tube current detection protection circuit with self-locking function
CN111525500A (en) Short circuit and overcurrent protection circuit and method
CN106532635A (en) Apd protection circuit
CN217388217U (en) Output overcurrent rapid protection circuit in switching power supply
CN116719384B (en) Detection control circuit and switching circuit
CN117410928B (en) Bidirectional controllable chip current-limiting detection circuit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant