CN114172114A - Module power output protection circuit - Google Patents
Module power output protection circuit Download PDFInfo
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- CN114172114A CN114172114A CN202111316079.5A CN202111316079A CN114172114A CN 114172114 A CN114172114 A CN 114172114A CN 202111316079 A CN202111316079 A CN 202111316079A CN 114172114 A CN114172114 A CN 114172114A
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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
- 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
- H02H3/20—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 voltage
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Abstract
The invention relates to a module power supply output protection circuit in the technical field of secondary power supplies, which comprises: the cut-off type overcurrent protection module (1), the cut-off type overvoltage protection module (2), the power supply control module (3), the slow start module (5) and the reference power supply module (6), wherein the cut-off type overcurrent protection module (1) and the cut-off type overvoltage protection module (2) are used for controlling the charge and discharge of the external slow start module (5) of the power supply control module (3) so as to control the normal work or stop work of the power supply control module (3); the reference power supply module (6) is used for providing reference voltage for the interception type overcurrent protection module (1) and the interception type overvoltage protection module (2). When the output end of the secondary power supply has faults of overcurrent, short circuit, overvoltage and the like, the output of the secondary power supply can be cut off in time to achieve the purpose of protecting the power load. Meanwhile, the circuit has the characteristic of ultra-low power consumption.
Description
Technical Field
The invention relates to the technical field of secondary power supplies, in particular to a module power supply output protection circuit.
Background
With the rapid development of the aerospace technology, the types and the number of the spacecrafts are continuously increased, the spacecraft system is more and more complex, the operation environment is more and more severe, the types of the effective loads are more and more, the types of the spacecraft power supply system are more and more, and the functions are more and more complex. Therefore, in the design process of the spacecraft, the requirement on the reliability of the electronic equipment is continuously improved, and the requirement on the protection function of the module power supply for supplying power to the electronic equipment is also continuously improved.
The spacecraft secondary power supply widely uses an aerospace grade UC18xx series chip as a controller, and the chip has the advantages of simple internal structure, convenient peripheral circuit setting and high reliability, and can be set to be in a current mode and a voltage mode. The chip does not have the standby cut-off protection function when the load of the output end is over-current and short-circuited, and also does not have the standby cut-off protection function of output overvoltage. When overcurrent or short circuit occurs at the user load end, even when the output overvoltage occurs at the secondary power supply, the aerospace grade UC18xx series chip protects the module power supply and the user load by reducing or limiting the output voltage by reducing the output Pulse Width (PWM) of the controller. If the situation can not be found in time, the secondary power supply and the effective load have the risk of being burnt, and the reliability of the spacecraft is seriously influenced. Moreover, the secondary power supply of the spacecraft is required to be not damaged under the conditions of overload and short circuit by a user and to have a recoverable function after the overload or short circuit fault is removed. Therefore, when the output end of the secondary power supply has faults of overcurrent, short circuit, overvoltage and the like, the condition that the output of the secondary power supply can be cut off in time is a necessary condition for increasing the reliability of the system.
Disclosure of Invention
In order to solve the problems in the prior art, an object of the present invention is to provide a module power output protection circuit, which can timely cut off the output of a secondary power supply to protect an electrical load when the output of the secondary power supply has faults such as overcurrent, short circuit, and overvoltage.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention provides a module power supply output protection circuit, comprising: the cut-off type overcurrent protection module and the cut-off type overvoltage protection module are used for controlling charging and discharging of the slow start module, so that the power control module is controlled to normally work or stop working; the reference power supply module is used for providing reference voltage for the cut-off type overcurrent protection module and the cut-off type overvoltage protection module.
According to an aspect of the present invention, the current interception type overcurrent protection module includes: a current sampling resistor, a differential amplifying circuit, an isolating circuit and a first voltage comparing circuit,
the current sampling resistor is connected between the input ends of the differential amplification circuit in parallel;
the output end of the differential amplification circuit is connected to the input end of the isolation circuit;
the output end of the isolation circuit is connected to the input end of the first voltage comparison circuit.
According to an aspect of the present invention, the differential amplifying circuit includes: a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a third capacitor and a first comparator,
the first end of the second resistor is connected to the first end of the first capacitor, and the second end of the second resistor is connected to the non-inverting input end of the first comparator;
the first end of the third resistor is connected to the second end of the first capacitor, and the second end of the third resistor is connected to the inverting input end of the first comparator;
the first ends of the fourth resistor and the second capacitor are connected to the positive input end of the first comparator, and the second ends of the fourth resistor and the second capacitor are grounded;
the first end of the fifth resistor is connected to the inverting input end of the first comparator, and the second end of the fifth resistor is connected to the output end of the first comparator;
the first capacitor is connected with the current sampling resistor in parallel;
and the first end of the third capacitor is connected to the output end of the first comparator, and the second end of the third capacitor is grounded.
According to one aspect of the invention, the isolation circuit comprises: a sixth resistor and a first diode,
a first end of the sixth resistor is connected to the output end of the first comparator, and a second end of the sixth resistor is connected to the anode of the first diode;
and the cathode of the first diode is connected to the second end of the seventh resistor.
According to an aspect of the present invention, the first voltage comparing circuit includes: a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a fourth capacitor, a fifth capacitor, a second comparator, a second diode and a third diode,
first ends of the seventh resistor, the eighth resistor, the ninth resistor and the fourth capacitor are all connected to an inverting input end of the second comparator;
first ends of the tenth resistor, the eleventh resistor and the fifth capacitor and an anode of the third diode are all connected to a non-inverting input end of the second comparator;
second ends of the eighth resistor, the fourth capacitor, the eleventh resistor and the fifth capacitor are all grounded;
second ends of the ninth resistor and the tenth resistor are connected to an output end of the reference power supply module;
the cathode of the third diode is connected to the output end of the second comparator;
the anode of the second diode is connected to the slow start module and the power control module, and the cathode of the second diode is connected to the output end of the second comparator.
According to one aspect of the invention, the current interception type overvoltage protection module comprises: a voltage acquisition circuit and a second voltage comparison circuit,
the voltage acquisition circuit comprises a fifteenth resistor, a sixteenth resistor and a seventh capacitor, wherein the first end of the fifteenth resistor is connected to the second end of the current sampling resistor, and the second end of the fifteenth resistor is connected to the first ends of the sixteenth resistor and the seventh capacitor;
second ends of the sixteenth resistor and the seventh capacitor are both grounded;
a second end of the fifteenth resistor, a first end of the sixteenth resistor and a first end of the seventh capacitor are all connected to an input end of the second voltage comparison circuit.
According to an aspect of the present invention, the second voltage comparing circuit includes: a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a sixth capacitor, a third comparator, a fourth diode and a fifth diode,
a first end of the twelfth resistor is connected to an inverting input end of the third comparator;
first ends of the thirteenth resistor, the fourteenth resistor and the sixth capacitor and an anode of the fifth diode are all connected to a positive-phase input end of the third comparator;
second ends of the thirteenth resistor and the sixth capacitor are both grounded;
second ends of the twelfth resistor and the fourteenth resistor are connected to an output end of the reference power supply module;
cathodes of the fifth diode and the fourth diode are both connected to an output end of the third comparator;
the anode of the fourth diode is connected to the slow start module and the power supply control module;
an inverting input terminal of the third comparator is connected to the second terminal of the fifteenth resistor and the first terminals of the sixteenth resistor and the seventh capacitor.
According to one aspect of the invention, the slow-start module comprises: an eighth capacitor, which is connected to the first capacitor,
and the first end of the eighth capacitor is connected to the anode of the second diode of the cut-off type over-current protection module, the anode of the fourth diode of the cut-off type over-voltage protection module and the enabling end of the power control module, and the second end of the eighth capacitor is grounded.
According to an aspect of the invention, the reference power supply module comprises: a seventeenth resistor, an eighteenth resistor and a zener diode,
the first ends of the seventeenth resistor and the eighteenth resistor are both connected with voltage, and the second ends of the seventeenth resistor and the eighteenth resistor are both connected to the output end of the reference power supply module;
and the anode of the voltage stabilizing diode is grounded, and the cathode of the voltage stabilizing diode is connected to the output end of the reference power supply module.
According to an aspect of the invention, further comprising: a power conversion module for converting the power of the power source into a DC voltage,
the power conversion module comprises a switch, and the power supply control module triggers the switch to be switched on or switched off by judging whether a pulse width modulation signal is output or not;
the output end of the power conversion module is connected with the current sampling resistor of the cut-off type over-current protection module in series and is connected with the voltage acquisition circuit of the cut-off type over-voltage protection module in parallel.
Has the advantages that:
according to the scheme of the invention, the module power supply output protection circuit adopts the ultra-low power consumption output short circuit, overcurrent and overvoltage protection circuit based on secondary side output current sampling and secondary side voltage sampling, so that the level of an enable end of a UC18XX series chip is pulled down, and PWM waves cannot be generated. In the mode, only the chip and the auxiliary power supply work, meanwhile, when the module power supply is in short circuit, overcurrent or overvoltage, the protection circuit is in a cut-off mode, and the module power supply is in a standby mode.
In addition, the overcurrent protection, the short-circuit protection and the overvoltage protection in the invention realize independent control. The existing UC18XX series chip is used as the secondary power supply of the controller, the overcurrent protection point and the overvoltage protection point are coupled, and the parameters are difficult to match. By the circuit structure, the over-current protection point and the over-voltage protection point are decoupled, and parameter debugging is simple.
Drawings
FIG. 1 is a schematic diagram of a module power output protection circuit according to an embodiment of the present invention;
fig. 2 schematically shows a specific structure diagram of a module power output protection circuit according to an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.
Fig. 1 and 2 schematically show the respective block compositions and specific circuit configurations of the block power output protection circuit according to the present embodiment. As shown in fig. 1, in this embodiment, the module power output protection circuit mainly includes a current-cut-off type overcurrent protection module 1, a current-cut-off type overvoltage protection module 2, a power control module 3, a power conversion module 4, a slow start module 5, and a reference power supply module 6. The intercepting type overcurrent protection module 1 and the intercepting type overvoltage protection module 2 can be used for controlling the slow start module 5 to charge and discharge and controlling the power control module 3 to normally work or stop working. When the power control module 3 outputs the pulse width modulation signal PWM, the power control module 3 is considered to be normally operated, and when the power control module 3 does not output the pulse width modulation signal PWM, the power control module 3 is considered to be stopped. Therefore, when short circuit and overcurrent occur, the cut-off type overcurrent protection module 1 can play a role in protecting the electric load. The cutoff type overvoltage protection module 2 is used to protect the function of the electric load when overvoltage occurs. The electric load here refers to the power conversion module 4 in the present embodiment. The reference power supply module 6 is used for providing a reference voltage Vref for the cutoff type overcurrent protection module 1 and the cutoff type overvoltage protection module 2. The power control module 3 of this embodiment may adopt a UC18xx chip series.
As shown in fig. 2, the power conversion module 4 of the present embodiment is further provided with a switch. The power control module 3 triggers the switch to be turned on or off by whether a pulse signal is output or not. The output end of the power conversion module 4 is connected in series with the current sampling resistor R1 of the cut-off type over-current protection module 1 and is connected in parallel with the voltage acquisition circuit of the cut-off type over-voltage protection module 2. The current sampling resistor R1 in the current interception type overcurrent protection module 1 is mainly used for collecting the current signal output by the power conversion module 4 and converting the current signal into a voltage signal. The voltage acquisition circuit in the current interception type overvoltage protection module 2 is mainly used for acquiring the voltage output by the power conversion module 4.
As shown in fig. 2, the cutoff type overcurrent protection module 1 includes: the circuit comprises a current sampling resistor R1, a differential amplification circuit, an isolation circuit and a first voltage comparison circuit. The current sampling resistor R1 is connected in parallel between the input ends of the differential amplifying circuit. The output end of the differential amplification circuit is connected to the input end of the isolation circuit. The output end of the isolation circuit is connected to the input end of the first voltage comparison circuit.
The differential amplifier circuit includes: the circuit comprises a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a first comparator U1. The first end of the second resistor R2 is connected to the first end of the first capacitor C1, and the second end is connected to the non-inverting input terminal of the first comparator U1. The third resistor R3 has a first terminal connected to the second terminal of the first capacitor C1, and a second terminal connected to the inverting input terminal of the first comparator U1. The first ends of the fourth resistor R4 and the second capacitor C2 are both connected to the non-inverting input terminal of the first comparator U1, and the second ends are both grounded. The fifth resistor R5 has a first terminal connected to the inverting input terminal of the first comparator U1 and a second terminal connected to the output terminal of the first comparator U1. The first capacitor C1 is connected in parallel with the current sampling resistor R1. The third capacitor C3 has a first terminal connected to the output terminal of the first comparator U1 and a second terminal connected to ground. The differential amplifier circuit having this configuration is used to amplify the voltage signal converted by the current sampling resistor R1.
The isolation circuit includes: a sixth resistor R6 and a first diode D1. The first end of the sixth resistor R6 is connected to the output end of the first comparator U1, and the second end is connected to the anode of the first diode D1. The cathode of the first diode D1 is connected to the second terminal of the seventh resistor R7. The isolation circuit can prevent the reference voltage Vref provided by the reference power supply module 6 for the first voltage comparison circuit from forming a sneak path through the differential amplification circuit.
The first voltage comparison circuit includes: the circuit comprises a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a fourth capacitor C4, a fifth capacitor C5, a second comparator U2, a second diode D2 and a third diode D3. First ends of the seventh resistor R7, the eighth resistor R8, the ninth resistor R9 and the fourth capacitor C4 are all connected to an inverting input end of the second comparator U2. First ends of the tenth resistor R10, the eleventh resistor R11 and the fifth capacitor C5, and an anode of the third diode D3 are all connected to a non-inverting input terminal of the second comparator U2. Second ends of the eighth resistor R8, the fourth capacitor C4, the eleventh resistor R11 and the fifth capacitor C5 are all grounded. Second ends of the ninth resistor R9 and the tenth resistor R10 are connected to an output end of the reference power supply module 6. The cathode of the third diode D3 is connected to the output of the second comparator U2. The anode of the second diode D2 is connected to the slow start module 5 and the power control module 3, and the cathode is connected to the output end of the second comparator U2. From the above circuit structure, the anode of the second diode D2 of the first voltage comparing circuit is connected to the enable terminal of the UC18XX chip.
As shown in fig. 2, the shut-off type overvoltage protection module 2 includes: the voltage acquisition circuit and the second voltage comparison circuit. The voltage acquisition circuit comprises a fifteenth resistor R15, a sixteenth resistor R16 and a seventh capacitor C7. The fifteenth resistor R15 has a first terminal connected to the second terminal of the current sampling resistor R1, and a second terminal connected to the sixteenth resistor R16 and the first terminal of the seventh capacitor C7. The second terminals of the sixteenth resistor R16 and the seventh capacitor C7 are both grounded. And the second end of the fifteenth resistor R15, the first end of the sixteenth resistor R16 and the seventh capacitor C7 are all connected to the input end of the second voltage comparison circuit.
The second voltage comparison circuit includes: a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a sixth capacitor C6, a third comparator U3, a fourth diode D4, and a fifth diode D5. The first end of the twelfth resistor R12 is connected to the inverting input of the third comparator U3. First ends of the thirteenth resistor R13, the fourteenth resistor R14 and the sixth capacitor C6, and an anode of the fifth diode D5 are all connected to a non-inverting input terminal of the third comparator U3. Second ends of the thirteenth resistor R13, the sixth capacitor C6 and the seventh capacitor C7 are all grounded. Second ends of the twelfth resistor R12 and the fourteenth resistor R14 are connected to an output end of the reference power supply module 6. Cathodes of the fifth diode D5 and the fourth diode D4 are both connected to an output terminal of the third comparator U3. The anode of the fourth diode D4 is connected to the slow start module 5 and the power control module 3.
As shown in fig. 2, the slow-start module 5 includes: an eighth capacitor C8. A first end of the eighth capacitor C8 is connected to the anode of the second diode D2 of the cut-off type overcurrent protection module 1, the anode of the fourth diode D4 of the cut-off type overvoltage protection module 2 and the enable end of the power control module 3, and a second end is grounded.
The reference power supply module 6 includes: a seventeenth resistor R17, an eighteenth resistor R18 and a zener diode Z1. The seventeenth resistor R17 and the eighteenth resistor R18 have first ends connected to a voltage, and second ends connected to the output end of the reference power module 6. The anode of the zener diode Z1 is grounded, and the cathode is connected to the output terminal of the reference power supply module 6.
When the module power supply normally works, the current output by the power conversion module 4 becomes a weak voltage signal through the current sampling resistor R1. The voltage signal is filtered by a first capacitor C1 in the differential amplifier circuit and amplified by the differential amplifier circuit. The amplified strong voltage signal and the reference voltage Vref applied to the ninth resistor R9 are superimposed by an addition circuit composed of a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9 to generate a voltage V3. The voltage V3 is compared with the voltage V4 divided by the tenth resistor R10 and the eleventh resistor R11 from the reference voltage Vref applied to the tenth resistor R10, at this time, the voltage V3 is lower than the voltage V4, so that the second comparator U2 outputs a high level of 12V, the second diode D2 is in an off state, the enable pin of the power control module 3 is at a high level, and the power control module 3 normally operates, that is, outputs the pulse width modulation signal PWM.
When the module power supply is over-current or short-circuited, the current output by the power conversion module 4 is changed into a weak voltage signal through the current sampling resistor R1. Similarly, the voltage signal is filtered and amplified. The amplified strong voltage signal and the reference voltage Vref are superimposed by an addition circuit composed of a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9 to generate a voltage V3. And compares the voltage V3 with a voltage V4 obtained by dividing the reference voltage Vref by the tenth resistor R10 and the eleventh resistor R11. At this time, the voltage V3 is higher than the voltage V4, and the second comparator U2 outputs a low level of 0V, so that the second diode D2 is turned on, and the third diode D3 is also turned on. The eighth capacitor C8 in the slow start module 5 connected to the anode of the second diode D2 of the cut-off overcurrent protection module 1 discharges, the power control module 3 stops working, that is, no pulse width modulation signal PWM is output, and the module power supply stops working and has no output. Because the third diode D3 is turned on, the positive phase input terminal of the second comparator U2 is clamped to be the conduction voltage drop of the third diode D3 of 0.7V, at this time, the reverse phase input terminal voltage of the second comparator U2 is the voltage of the reference voltage Vref after being divided by the eighth resistor R8 and the ninth resistor R9, and is higher than the positive phase input terminal voltage of the second comparator U2 by 0.7V, the output of the second comparator U2 is still at a low level, the enable terminal of the power control module 3 is pulled low, so that the power control module 3 is still in a stop working state, the module power supply has no output, the current output by the power conversion module 4 is locked, and thus the cut-off protection when the module power supply output is overcurrent is realized.
When the module power supply normally works, the voltage Vo output by the power conversion module 4 is filtered and noise-suppressed by the voltage acquisition circuit, and then is superimposed with the reference voltage Vref applied to the twelfth resistor R12 by the addition circuit composed of the twelfth resistor R12, the fifteenth resistor R15 and the sixteenth resistor R16 to generate a voltage V1, and the voltage V1 is compared with a voltage V2 obtained by dividing the reference voltage Vref applied to the fourteenth resistor R14 by the thirteenth resistor R13 and the fourteenth resistor R14. At this time, the voltage V1 is lower than the voltage V2, the third comparator U3 outputs a high level 12V, the fourth diode D4 is in an off state, the enable pin of the power control module 3 is at a high level, the power control module 3 normally operates, and the pulse width modulation signal is output.
When the output end of the module power supply is over-voltage, the voltage V1 generated by superposition is compared with the voltage V2 generated by dividing the reference voltage Vref. At this time, the voltage V1 is higher than the voltage V2, the third comparator U3 outputs a low level of 0V, the fourth diode D4 is in a conducting state, and the fifth diode D5 is conducting at the same time, so that the eighth capacitor C8 in the soft start module 5 connected to the anode of the fourth diode D4 of the cut-off overvoltage protection module 2 is discharged, the power control module 3 stops working, no PWM output is performed, and the module power supply stops working and no output is performed. Since the fifth diode D5 is turned on, the positive phase input terminal of the third comparator U3 is clamped to be the conduction voltage drop of the fifth diode D5 of 0.7V, at this time, the reverse phase input terminal voltage of the third comparator U3 is a voltage obtained by dividing the reference voltage Vref by the twelfth resistor R12, the fifteenth resistor R15 and the sixteenth resistor R16, and is 0.7V higher than the positive phase input terminal voltage of the third comparator U3, the third comparator U3 is still at a low level, and the enable terminal of the power control module 3 is pulled down, so that the power control module 3 is still in a stop working state, the module power supply has no output, the voltage output by the power conversion module 4 is locked, and the cut-off protection when the module power supply output is in overvoltage is realized.
In summary, the module power output protection circuit adopts the ultra-low power consumption output short circuit, overcurrent and overvoltage protection circuit based on secondary output current sampling and secondary voltage sampling, so that the level of the enable end of the power control module 3 is lowered, and the PWM wave cannot be generated. In the mode, only the chip and the auxiliary power supply work, meanwhile, when the module power supply is in short circuit, overcurrent or overvoltage, the protection circuit is in a cut-off mode, and the module power supply is in a standby mode. In addition, the cutoff type overcurrent protection module and the cutoff type overvoltage protection module in the circuit realize independent control, the overcurrent protection point and the overvoltage protection point are decoupled, and parameter debugging of circuit devices is simple.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A modular power output protection circuit, comprising: a cutoff type overcurrent protection module (1), a cutoff type overvoltage protection module (2), a power control module (3), a slow start module (5) and a reference power module (6),
the current interception type overcurrent protection module (1) and the current interception type overvoltage protection module (2) are used for controlling charging and discharging of the slow start module (5) so as to control the power supply control module (3) to normally work or stop working;
the reference power supply module (6) is used for providing reference voltage for the current interception type overcurrent protection module (1) and the current interception type overvoltage protection module (2).
2. Protection circuit according to claim 1, characterized in that said current interception type overcurrent protection module (1) comprises: a current sampling resistor (R1), a differential amplifying circuit, an isolating circuit and a first voltage comparing circuit,
the current sampling resistor (R1) is connected in parallel between the input ends of the differential amplification circuit;
the output end of the differential amplification circuit is connected to the input end of the isolation circuit;
the output end of the isolation circuit is connected to the input end of the first voltage comparison circuit.
3. The protection circuit according to claim 2, wherein the differential amplification circuit includes: a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a first capacitor (C1), a second capacitor (C2), a third capacitor (C3) and a first comparator (U1),
a first end of the second resistor (R2) is connected to a first end of the first capacitor (C1), and a second end is connected to a non-inverting input end of the first comparator (U1);
a first terminal of the third resistor (R3) is connected to a second terminal of the first capacitor (C1), and a second terminal is connected to an inverting input terminal of the first comparator (U1);
the first ends of the fourth resistor (R4) and the second capacitor (C2) are both connected to the non-inverting input end of the first comparator (U1), and the second ends are both grounded;
a first terminal of the fifth resistor (R5) is connected to the inverting input terminal of the first comparator (U1), and a second terminal is connected to the output terminal of the first comparator (U1);
the first capacitor (C1) is connected in parallel with the current sampling resistor (R1);
the first end of the third capacitor (C3) is connected to the output end of the first comparator (U1), and the second end is grounded.
4. The protection circuit of claim 3, wherein the isolation circuit comprises: a sixth resistor (R6) and a first diode (D1),
a first end of the sixth resistor (R6) is connected to the output end of the first comparator (U1), and a second end is connected to the anode of the first diode (D1);
the cathode of the first diode (D1) is connected to the second end of the seventh resistor (R7).
5. The protection circuit of claim 4, wherein the first voltage comparison circuit comprises: a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10), an eleventh resistor (R11), a fourth capacitor (C4), a fifth capacitor (C5), a second comparator (U2), a second diode (D2) and a third diode (D3),
first ends of the seventh resistor (R7), the eighth resistor (R8), the ninth resistor (R9) and the fourth capacitor (C4) are all connected to an inverting input end of the second comparator (U2);
the first ends of the tenth resistor (R10), the eleventh resistor (R11) and the fifth capacitor (C5) and the anode of the third diode (D3) are all connected to the non-inverting input of the second comparator (U2);
second ends of the eighth resistor (R8), the fourth capacitor (C4), the eleventh resistor (R11) and the fifth capacitor (C5) are all grounded;
the second ends of the ninth resistor (R9) and the tenth resistor (R10) are both connected to the output end of the reference power supply module (6);
the cathode of the third diode (D3) is connected to the output of the second comparator (U2);
the anode of the second diode (D2) is connected to the slow start module (5) and the power control module (3), and the cathode of the second diode is connected to the output end of the second comparator (U2).
6. Protection circuit according to claim 1, characterized in that said current interception type overvoltage protection module (2) comprises: a voltage acquisition circuit and a second voltage comparison circuit,
the voltage acquisition circuit comprises a fifteenth resistor (R15), a sixteenth resistor (R16) and a seventh capacitor (C7), wherein a first end of the fifteenth resistor (R15) is connected to a second end of the current sampling resistor (R1), and a second end of the fifteenth resistor (R15) is connected to first ends of the sixteenth resistor (R16) and the seventh capacitor (C7);
a second terminal of the sixteenth resistor (R16) and the seventh capacitor (C7) are both connected to ground;
the second end of the fifteenth resistor (R15), the sixteenth resistor (R16) and the first end of the seventh capacitor (C7) are all connected to the input end of the second voltage comparison circuit.
7. The protection circuit of claim 6, wherein the second voltage comparison circuit comprises: a twelfth resistor (R12), a thirteenth resistor (R13), a fourteenth resistor (R14), a sixth capacitor (C6), a third comparator (U3), a fourth diode (D4) and a fifth diode (D5),
a first terminal of the twelfth resistor (R12) is connected to the inverting input of the third comparator (U3);
the first ends of the thirteenth resistor (R13), the fourteenth resistor (R14) and the sixth capacitor (C6) and the anode of the fifth diode (D5) are all connected to the non-inverting input of the third comparator (U3);
a second terminal of the thirteenth resistor (R13) and the sixth capacitor (C6) are both grounded;
a second end of the twelfth resistor (R12) and a second end of the fourteenth resistor (R14) are both connected to an output end of the reference power supply module (6);
the cathodes of the fifth diode (D5) and the fourth diode (D4) are both connected to the output of the third comparator (U3);
the anode of the fourth diode (D4) is connected to the slow start module (5) and the power control module (3);
an inverting input terminal of the third comparator (U3) is connected to the second terminal of the fifteenth resistor (R15) and the first terminals of the sixteenth resistor (R16) and the seventh capacitor (C7).
8. Protection circuit according to claim 1, characterized in that said graceful start module (5) comprises: an eighth capacitance (C8),
the first end of the eighth capacitor (C8) is connected to the anode of the second diode (D2) of the current-chopping type overcurrent protection module (1), the anode of the fourth diode (D4) of the current-chopping type overvoltage protection module (2) and the enabling end of the power control module (3), and the second end of the eighth capacitor is grounded.
9. Protection circuit according to claim 1, characterized in that said reference power supply module (6) comprises: a seventeenth resistor (R17), an eighteenth resistor (R18) and a zener diode (Z1),
the seventeenth resistor (R17) and the eighteenth resistor (R18) are connected with a voltage at the first ends and connected with the output end of the reference power supply module (6) at the second ends;
the anode of the voltage-stabilizing diode (Z1) is grounded, and the cathode of the voltage-stabilizing diode is connected to the output end of the reference power supply module (6).
10. The protection circuit of claim 1, further comprising: a power conversion module (4),
the power conversion module (4) comprises a switch, and the power supply control module (3) triggers the switch to be switched on or switched off by judging whether a pulse width modulation signal is output or not;
the output end of the power conversion module (4) is connected with a current sampling resistor (R1) of the current interception type over-current protection module (1) in series and is connected with a voltage acquisition circuit of the current interception type over-voltage protection module (2) in parallel.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111316079.5A CN114172114A (en) | 2021-11-08 | 2021-11-08 | Module power output protection circuit |
| PCT/CN2022/115602 WO2023077929A1 (en) | 2021-11-08 | 2022-08-29 | Modular power supply output protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111316079.5A CN114172114A (en) | 2021-11-08 | 2021-11-08 | Module power output protection circuit |
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| Publication Number | Publication Date |
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| CN114172114A true CN114172114A (en) | 2022-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111316079.5A Pending CN114172114A (en) | 2021-11-08 | 2021-11-08 | Module power output protection circuit |
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| Country | Link |
|---|---|
| CN (1) | CN114172114A (en) |
| WO (1) | WO2023077929A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023077929A1 (en) * | 2021-11-08 | 2023-05-11 | 北京卫星制造厂有限公司 | Modular power supply output protection circuit |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117590054B (en) * | 2023-11-27 | 2024-05-28 | 西南石油大学 | Analog automatic current detection alarm protection device |
| CN117405967B (en) * | 2023-11-27 | 2024-08-30 | 江苏斯菲尔电气股份有限公司 | Integrated three-phase current monitoring system |
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| JPH06276734A (en) * | 1993-03-15 | 1994-09-30 | Fujitsu Denso Ltd | Overcurrent protective circuit |
| CN1885698A (en) * | 2005-06-24 | 2006-12-27 | 三洋电机株式会社 | Switching control circuit and self-excited dc-dc converter |
| CN2904416Y (en) * | 2006-01-24 | 2007-05-23 | 许晓华 | Overcurrent locking circuit |
| KR102164860B1 (en) * | 2019-08-14 | 2020-10-13 | 엘아이지넥스원 주식회사 | Protection Device of Overvoltage or Overcurrent on Isolated Converter |
| CN213817224U (en) * | 2020-12-02 | 2021-07-27 | 金卡智能集团股份有限公司 | Power supply protection circuit and circuit system |
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| US6185082B1 (en) * | 1999-06-01 | 2001-02-06 | System General Corporation | Protection circuit for a boost power converter |
| CN101447738B (en) * | 2008-12-29 | 2012-05-02 | 重庆航天工业公司 | Flameproof intrinsically safe power supply device |
| CN103166194A (en) * | 2011-12-17 | 2013-06-19 | 西安恒飞电子科技有限公司 | Input overvoltage and under-voltage protection circuit of communication power supply module |
| CN111490519A (en) * | 2020-03-26 | 2020-08-04 | 上海芯导电子科技股份有限公司 | Overvoltage and overcurrent protection chip |
| CN114172114A (en) * | 2021-11-08 | 2022-03-11 | 北京卫星制造厂有限公司 | Module power output protection circuit |
-
2021
- 2021-11-08 CN CN202111316079.5A patent/CN114172114A/en active Pending
-
2022
- 2022-08-29 WO PCT/CN2022/115602 patent/WO2023077929A1/en active Application Filing
Patent Citations (5)
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|---|---|---|---|---|
| JPH06276734A (en) * | 1993-03-15 | 1994-09-30 | Fujitsu Denso Ltd | Overcurrent protective circuit |
| CN1885698A (en) * | 2005-06-24 | 2006-12-27 | 三洋电机株式会社 | Switching control circuit and self-excited dc-dc converter |
| CN2904416Y (en) * | 2006-01-24 | 2007-05-23 | 许晓华 | Overcurrent locking circuit |
| KR102164860B1 (en) * | 2019-08-14 | 2020-10-13 | 엘아이지넥스원 주식회사 | Protection Device of Overvoltage or Overcurrent on Isolated Converter |
| CN213817224U (en) * | 2020-12-02 | 2021-07-27 | 金卡智能集团股份有限公司 | Power supply protection circuit and circuit system |
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| WO2023077929A1 (en) * | 2021-11-08 | 2023-05-11 | 北京卫星制造厂有限公司 | Modular power supply output protection circuit |
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| WO2023077929A1 (en) | 2023-05-11 |
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