CN111490519A - Overvoltage and overcurrent protection chip - Google Patents
Overvoltage and overcurrent protection chip Download PDFInfo
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- CN111490519A CN111490519A CN202010224742.8A CN202010224742A CN111490519A CN 111490519 A CN111490519 A CN 111490519A CN 202010224742 A CN202010224742 A CN 202010224742A CN 111490519 A CN111490519 A CN 111490519A
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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
- H02H3/10—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 additionally responsive to some other abnormal electrical conditions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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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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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to the technical field of integrated circuits, in particular to an overvoltage and overcurrent protection chip, which comprises: the overcurrent detection module is used for detecting a first detection voltage between a first fulcrum and a second fulcrum and comparing the first detection voltage with a first reference voltage; the overvoltage detection module is used for detecting a second detection voltage of the second pivot and comparing the second detection voltage with a second reference voltage; the first input end of the logic operation module is connected with the output end of the over-current detection module, and the second input end of the logic operation module is connected with the output end of the over-voltage detection module; the input end of the control module is connected with the output end of the logic operation module and used for cutting off the circuit when the circuit is in over-current or over-current. Has the advantages that: the overcurrent detection precision is high, and the anti-interference capability is strong; the overvoltage detection reaction speed is high, the reaction speed within 30ns can be achieved, and the overvoltage precision is high; in addition, the power consumption of the protection chip is extremely low, the leakage current is small, and the application range is wide.
Description
Technical Field
The invention relates to the technical field of integrated circuits, in particular to an overvoltage and overcurrent protection chip.
Background
The circuit protection chip is used for filtering out a high-voltage part higher than a preset reference voltage through internal logic judgment so as to prevent the high voltage from damaging the back-end circuit. Since high voltage and large current may cause serious impact on the back-end circuit, a protection chip for simultaneously monitoring voltage and circuit is required, which can timely cut off the circuit when the circuit is over-voltage or over-current.
Disclosure of Invention
Aiming at the problems in the prior art, the overvoltage and overcurrent protection chip is provided.
The specific technical scheme is as follows:
the invention relates to an overvoltage and overcurrent protection chip, which comprises:
the overcurrent detection module is used for detecting a first detection voltage between a first fulcrum and a second fulcrum, comparing the first detection voltage with a first reference voltage, and outputting a first judgment result when the first detection voltage is greater than the first reference voltage;
the overvoltage detection module is used for detecting a second detection voltage of the second pivot, comparing the second detection voltage with a second reference voltage, and outputting a second judgment result when the second detection voltage is greater than the second reference voltage;
a logic operation module, a first input end of which is connected to the output end of the overcurrent detection module, and a second input end of which is connected to the output end of the overvoltage detection module, for forming a third determination result according to the first determination result and the second determination result;
and the input end of the control module is connected with the output end of the logic operation module and is used for cutting off the circuit when the third judgment result shows that the overcurrent detection module has overcurrent and/or the overvoltage detection module has overvoltage.
Preferably, the overcurrent detection module includes:
a first detection unit configured to detect a differential voltage between the first fulcrum and the second fulcrum as the first detection voltage;
the input end of the differential amplification unit is connected with the output end of the first detection unit and is used for amplifying the first detection voltage;
the input end of the first judging unit is connected with the output end of the differential amplifying unit, and the first judging unit is internally preset with the first reference voltage and used for comparing the amplified first detection voltage with the first reference voltage.
Preferably, the first detection unit includes:
the first resistor is connected between the first fulcrum and a third fulcrum;
and the second resistor is connected between the second fulcrum and a fourth fulcrum and is connected with the first resistor in parallel.
Preferably, the differential amplifying unit includes:
and the first input end of the operational amplifier is connected with the third pivot, and the second input end of the operational amplifier is connected with the fourth pivot.
Preferably, the first judging unit includes:
the first capacitor is connected between the first input end of the operational amplifier and a grounding end through the third pivot;
the second capacitor is connected between the second input end of the operational amplifier and the grounding end through the fourth pivot;
the third capacitor is connected between the third fulcrum and the fourth fulcrum;
the adjustable third resistor is connected between the second input end of the operational amplifier and the grounding end;
a first voltage comparator, a first input terminal of which is connected to the output terminal of the operational amplifier, a second input terminal of which is connected to the power supply terminal, and an output terminal of which is used as the output terminal of the over-current detection module and is connected to the first input terminal of the logic operation module;
the fourth resistor is connected between the first input end of the first voltage comparator and the output end of the operational amplifier;
the adjustable fifth resistor is connected between the second input end of the first voltage comparator and the grounding end;
the sixth resistor is connected between the second input end of the first voltage comparator and the power supply end;
and the adjustable fourth capacitor is connected between the first input end of the first voltage comparator and the ground end through a fifth pivot.
Preferably, the overvoltage detection module specifically includes a second detection unit, and the second detection unit includes:
and the seventh resistor is connected between the second pivot and the grounding end through an eighth resistor.
Preferably, the overvoltage detection module further includes a second determination unit, and the second determination unit includes:
a second voltage comparator, a first input end of the second voltage comparator is connected between the seventh resistor and the eighth resistor, a second input end of the second voltage comparator is connected with a power supply end through a ninth resistor, a second input end of the second voltage comparator is connected with a ground end through a tenth resistor, and an output end of the second voltage comparator is used as an output end of the overvoltage detection module and is connected with a second input end of the logic operation module;
and the fifth capacitor is connected between the second pivot and the first input end of the second voltage comparator.
Preferably, the logic operation module comprises an or gate.
Preferably, the control module includes:
the grid electrode of the first MOS tube is connected with the output end of the logic operation module, the drain electrode of the first MOS tube is connected with a sixth fulcrum, and the source electrode of the first MOS tube is connected with the grounding end;
the eleventh resistor is connected between the grid electrode of the first MOS tube and the grounding end through a seventh pivot;
the input end of the charge pump is connected with the drain electrode of the first MOS tube through a twelfth resistor;
and the grid electrode of the second MOS tube is connected with the output end of the logic operation module through the seventh pivot, the drain electrode of the second MOS tube is connected with an eighth pivot, and the source electrode of the second MOS tube is connected with the grounding end.
Preferably, the first MOS transistor and the second MOS transistor are both N-type MOS transistors.
The technical scheme has the following advantages or beneficial effects: the overvoltage and overcurrent protection chip provided by the invention has the advantages of high overcurrent detection precision and strong anti-interference capability; the overvoltage detection reaction speed is high, the reaction speed within 30ns can be achieved, and the overvoltage precision is high; in addition, the power consumption of the protection chip is extremely low, the leakage current is small, and the application range is wide.
Drawings
Embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings. The drawings are, however, to be regarded as illustrative and explanatory only and are not restrictive of the scope of the invention.
Fig. 1 is a circuit structure diagram of a protection chip in an embodiment of the present invention;
fig. 2 is a schematic block diagram of a protection chip in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
The invention provides an overvoltage and overcurrent protection chip, as shown in fig. 1 and fig. 2, comprising:
an overcurrent detection module 1, configured to detect a first detection voltage between a first supporting point a and a second supporting point B, compare the first detection voltage with a first reference voltage, and output a first determination result when the first detection voltage is greater than the first reference voltage;
the overvoltage detection module 2 is used for detecting a second detection voltage of the second pivot B, comparing the second detection voltage with a second reference voltage, and outputting a second judgment result when the second detection voltage is greater than the second reference voltage;
a logic operation module 3, a first input end of the logic operation module 3 is connected with the output end of the overcurrent detection module 1, a second input end of the logic operation module 3 is connected with the output end of the overvoltage detection module 2, and the logic operation module is used for forming a third judgment result according to the first judgment result and the second judgment result;
and the input end of the control module 4 is connected with the output end of the logic operation module 3, and is used for cutting off the circuit when the third judgment result shows that the overcurrent detection module 1 is in overcurrent and/or the overvoltage detection module 2 is in overvoltage.
Specifically, a differential circuit is formed by collecting voltages at two ends of a power MOSFET or a precision resistor in a circuit at two supporting points A and B, a differential mode voltage △ V is Vb-Va-Io Rdson, a point B detects voltage input ends at two ends, and a point A is a voltage output end at two ends, a first reference voltage is preset in an overcurrent detection module, if the first detected voltage is greater than the first reference voltage, the overcurrent exists in the circuit, the overcurrent detection module outputs a first judgment result to a logic operation module, namely a high level is output to the logic operation module, meanwhile, a second reference voltage is preset in the overvoltage detection module, if the second detected voltage is greater than the second reference voltage, the overvoltage detection module outputs a second judgment result to the logic operation module, namely a high level is output to the logic operation module, and when any one input end of the logic operation module inputs the high level, the logic operation module outputs a third judgment result to the control module, namely the high level is output to the control module, and the control module cuts off the overcurrent signal, thereby realizing the protection function of the overcurrent.
In a preferred embodiment, as shown in fig. 1, the overcurrent detection module 1 includes:
a first detection unit 101 for detecting a differential voltage between the first fulcrum and the second fulcrum as a first detection voltage;
the input end of the differential amplification unit 102 is connected with the output end of the first detection unit and is used for amplifying the first detection voltage;
and a first judging unit 103, an input end of the first judging unit is connected with an output end of the differential amplifying unit, and a first reference voltage is preset in the first judging unit and used for comparing the amplified first detection voltage with the first reference voltage.
Specifically, in the present embodiment, the differential amplifying unit 102 employs one operational amplifier Q1, the first detecting unit 101 is a first resistor R1 and a second resistor R2 respectively connected to the point a and the point B, and the first determining unit 103 is a first voltage comparator Q2.
Specifically, the first detection unit includes a differential circuit composed of R1 and R2, the differential amplification unit mainly includes an operational amplifier Q1, and the first judgment unit mainly includes a first voltage comparator Q2. An operational amplifier Q1, the first input terminal of the operational amplifier Q1 is connected through a first resistor R1; the second input end of the operational amplifier Q1 is connected with the second pivot B through a second resistor R2 at the first pivot A; a first capacitor C1 connected between the first input terminal of the operational amplifier Q1 and the ground terminal through a third pivot; a second capacitor C2 connected between the second input terminal of the operational amplifier Q1 and the ground terminal through a fourth pivot; a third capacitor C3 connected between the third pivot and the fourth pivot; an adjustable third resistor R3 connected between the second input terminal of the operational amplifier Q1 and the ground terminal for adjusting the voltage of the second pivot B; a first voltage comparator Q2, wherein a first input terminal of the first voltage comparator Q2 is connected to the output terminal of the operational amplifier Q1, a second input terminal of the first voltage comparator Q2 is connected to the power supply terminal Vdd, and an output terminal of the first voltage comparator Q2, as the output terminal of the overcurrent detection module, is connected to the first input terminal of the logic operation module; a fourth resistor R4 connected between the first input terminal of the first voltage comparator Q2 and the output terminal of the operational amplifier Q1; an adjustable fifth resistor R5 connected between the second input terminal of the first voltage comparator Q2 and ground; a sixth resistor R6 connected between the second input terminal of the first voltage comparator Q2 and the power source terminal; an adjustable fourth capacitor C4 is connected between the first input terminal of the first voltage comparator Q2 and ground via a fifth pivot.
According to the technical scheme, the first detection voltage is subjected to high-frequency interference filtering by an RF filter circuit formed by C1, C2 and C3, and then is input into an operational amplifier Q1 for amplification, and a third resistor R3 is designed to be a trimming resistor, so that the trimming of the signal voltage at a point B can be effectively increased, the detection precision of an over-current detection circuit is increased, and the reduction of the detection precision caused by improper circuit or PCB design is eliminated; in addition, the differential amplifier circuit composed of the operational amplifier Q1 can effectively suppress zero drift and increase the detection accuracy of the current.
Specifically, the fourth resistor R4 and the fourth capacitor C4 form a delay for the overcurrent high-level signal, and under the condition that the resistance value of R4 is fixed, the delay time for the overcurrent high-level signal can be increased or decreased by adjusting C4, Vdd is an internal L DO (low dropout regulator) fixed output voltage, and by fixing the resistance value of the sixth resistor R6 and adjusting the resistance value of the resistor R5, the first reference voltage of the Q2 voltage comparator can be precisely designed, for example, after the high-level signal HQ1 is delayed for t1 time by a circuit formed by R4 and C4, the amplitude of the high-level signal HQ1 is still greater than the first reference voltage Vref1, the first voltage comparator Q2 outputs the high-level signal HQ2, the delay t1 for the overcurrent high-level signal is beneficial to the over-current phenomenon caused by the power circuit during startup or power circuit power load change is detected, so that the power circuit is prevented from being dead-locked when the power circuit is started or the power circuit is switched off.
In a preferred embodiment, as shown in fig. 1, the overvoltage detection module 2 specifically includes:
the second detection unit 201:
a seventh resistor R7 connected between the second pivot B and the ground terminal through an eighth resistor R8;
second determination unit 202:
a second voltage comparator Q3, a first input terminal of the second voltage comparator Q3 is connected between the seventh resistor R7 and the eighth resistor R8, a second input terminal of the second voltage comparator Q3 is connected to the power supply terminal through a ninth resistor R9, a second input terminal of the second voltage comparator Q2 is connected to the ground terminal through a tenth resistor R10, and an output terminal of the second voltage comparator Q2, as an output terminal of the overvoltage detection module, is connected to the second input terminal of the logic operation module;
a fifth capacitor C5 connected between the second pivot B and the first input terminal of the second voltage comparator Q3.
Specifically, the voltage at the input end of the point B is subjected to voltage division processing through a seventh resistor R7 and an eighth resistor R8 to obtain a level Vo (namely, a second detection voltage), Vdd is an internal L DO fixed output voltage, a second reference voltage of a second voltage comparator Q3 can be precisely designed by fixing the resistance value of R9 and trimming the resistance value of a resistor R10, the voltage comparator Q3 compares the second detection voltage Vo with a second reference voltage Vref2, if the second detection voltage is greater than the second reference voltage, a high level HQ3 is output, the logic operation module comprises an or gate Q4, and the HQ2 and the HQ3 are input into the or gate for performing or operation, so as to output the level Vc, and the control module cuts off the circuit through the level Vc.
In a preferred embodiment, as shown in FIG. 1, the control module 4 includes:
a first MOS transistor D1, wherein the gate of the first MOS transistor D1 is connected to the output terminal of the logic operation module (i.e., the or gate Q4), the drain of the first MOS transistor D1 is connected to a sixth pivot N, and the source of the first MOS transistor is connected to the ground terminal;
an eleventh resistor R11 connected between the gate of the first MOS transistor D1 and the ground through a seventh pivot;
the input end of the charge pump M is connected with the drain electrode of the first MOS tube D1 through a twelfth resistor R12;
a second MOS transistor D2, the gate of the second MOS transistor D2 is connected to the output terminal of the logic operation module Q4 through the seventh pivot, the drain of the second MOS transistor D2 is connected to an eighth pivot P, and the source of the second MOS transistor D2 is connected to the ground.
Specifically, as shown in fig. 2, the protection chip further includes an enable control module 5, which is respectively connected to the overcurrent detection module 1, the overvoltage detection module 2, the logic operation module 3, and the control module 4, and the enable control module 5 is configured to control the overall function of the protection chip to be turned on or off. In this embodiment, both D1 and D2 are NMOS transistors. After the or gate Q4 outputs the level Vc, the level Vc controls the gates of D1 and D2 and is connected to ground through the R11 resistor. When any one of the outputs of the HQ2 and the HQ3 is in a high level, Vc is in a high level, D1 and D2 are conducted when Vc is in the high level, the drain voltage of the NMOS is pulled to be 0 level, and when the series output voltage of the charge pump and the R12 resistor is pulled down to be 0V, the switch of the power NMOS can be controlled, so that double protection of overvoltage and overcurrent is realized.
The embodiment of the invention has the beneficial effects that: the invention provides an overvoltage and overcurrent protection chip, which is characterized in that an overcurrent value is externally adjusted through the design of an external resistor and the adjustment of an overcurrent voltage comparison voltage reference, so that the overcurrent situation of load current can be accurately detected, and the overcurrent detection precision is high; external interference can be effectively avoided through the design of an internal circuit, the circuit cannot be locked after being electrified, or the temperature drift of an overcurrent threshold value is caused due to the change of the environmental temperature; the overvoltage detection reaction speed is high, the reaction speed within 30ns can be achieved, and the overvoltage precision is high; in addition, the power consumption of the protection chip is extremely low, the leakage current is small, the application range is wide, and the protection chip can be applied to power supply circuits controlled by power NMOS and PMOS.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A protection chip for overvoltage and overcurrent is characterized by comprising:
the overcurrent detection module is used for detecting a first detection voltage between a first fulcrum and a second fulcrum, comparing the first detection voltage with a first reference voltage, and outputting a first judgment result when the first detection voltage is greater than the first reference voltage;
the overvoltage detection module is used for detecting a second detection voltage of the second pivot, comparing the second detection voltage with a second reference voltage, and outputting a second judgment result when the second detection voltage is greater than the second reference voltage;
a logic operation module, a first input end of which is connected to the output end of the overcurrent detection module, and a second input end of which is connected to the output end of the overvoltage detection module, for forming a third determination result according to the first determination result and the second determination result;
and the input end of the control module is connected with the output end of the logic operation module and is used for cutting off the circuit when the third judgment result shows that the overcurrent detection module has overcurrent and/or the overvoltage detection module has overvoltage.
2. The protection chip according to claim 1, wherein the overcurrent detection module includes:
a first detection unit configured to detect a differential voltage between the first fulcrum and the second fulcrum as the first detection voltage;
the input end of the differential amplification unit is connected with the output end of the first detection unit and is used for amplifying the first detection voltage;
the input end of the first judging unit is connected with the output end of the differential amplifying unit, and the first judging unit is internally preset with the first reference voltage and used for comparing the amplified first detection voltage with the first reference voltage.
3. The protection chip according to claim 2, wherein the first detection unit includes:
the first resistor is connected between the first fulcrum and a third fulcrum;
and the second resistor is connected between the second fulcrum and a fourth fulcrum and is connected with the first resistor in parallel.
4. The protection chip according to claim 3, wherein the differential amplification unit includes:
and the first input end of the operational amplifier is connected with the third pivot, and the second input end of the operational amplifier is connected with the fourth pivot.
5. The protection chip according to claim 4, wherein the first judgment unit includes:
the first capacitor is connected between the first input end of the operational amplifier and a grounding end through the third pivot;
the second capacitor is connected between the second input end of the operational amplifier and the grounding end through the fourth pivot;
the third capacitor is connected between the third fulcrum and the fourth fulcrum;
the adjustable third resistor is connected between the second input end of the operational amplifier and the grounding end;
a first voltage comparator, a first input terminal of which is connected to the output terminal of the operational amplifier, a second input terminal of which is connected to the power supply terminal, and an output terminal of which is used as the output terminal of the over-current detection module and is connected to the first input terminal of the logic operation module;
the fourth resistor is connected between the first input end of the first voltage comparator and the output end of the operational amplifier;
the adjustable fifth resistor is connected between the second input end of the first voltage comparator and the grounding end;
the sixth resistor is connected between the second input end of the first voltage comparator and the power supply end;
and the adjustable fourth capacitor is connected between the first input end of the first voltage comparator and the ground end through a fifth pivot.
6. The protection chip according to claim 1, wherein the overvoltage detection module specifically includes a second detection unit, and the second detection unit includes:
and the seventh resistor is connected between the second pivot and the grounding end through an eighth resistor.
7. The protection chip of claim 6, wherein the overvoltage detection module further comprises a second determination unit, and the second comparison unit comprises:
a second voltage comparator, a first input end of the second voltage comparator is connected between the seventh resistor and the eighth resistor, a second input end of the second voltage comparator is connected with a power supply end through a ninth resistor, a second input end of the second voltage comparator is connected with a ground end through a tenth resistor, and an output end of the second voltage comparator is used as an output end of the overvoltage detection module and is connected with a second input end of the logic operation module;
and the fifth capacitor is connected between the second pivot and the first input end of the second voltage comparator.
8. The protection chip of claim 1, wherein the logic operation module comprises an or gate.
9. The protection chip of claim 1, wherein the control module comprises:
the grid electrode of the first MOS tube is connected with the output end of the logic operation module, the drain electrode of the first MOS tube is connected with a sixth fulcrum, and the source electrode of the first MOS tube is connected with the grounding end;
the eleventh resistor is connected between the grid electrode of the first MOS tube and the grounding end through a seventh pivot;
the input end of the charge pump is connected with the drain electrode of the first MOS tube through a twelfth resistor;
and the grid electrode of the second MOS tube is connected with the output end of the logic operation module through the seventh pivot, the drain electrode of the second MOS tube is connected with an eighth pivot, and the source electrode of the second MOS tube is connected with the grounding end.
10. The protection chip of claim 9, wherein the first MOS transistor and the second MOS transistor are both N-type MOS transistors.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010224742.8A CN111490519A (en) | 2020-03-26 | 2020-03-26 | Overvoltage and overcurrent protection chip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010224742.8A CN111490519A (en) | 2020-03-26 | 2020-03-26 | Overvoltage and overcurrent protection chip |
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| CN111490519A true CN111490519A (en) | 2020-08-04 |
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| CN202010224742.8A Pending CN111490519A (en) | 2020-03-26 | 2020-03-26 | Overvoltage and overcurrent protection chip |
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| CN112003236A (en) * | 2020-08-28 | 2020-11-27 | 杭州海兴电力科技股份有限公司 | Overvoltage and overcurrent protection system for electric energy meter |
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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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Application publication date: 20200804 |