CN111668808A - Overvoltage protection circuit and computer system power supply - Google Patents

Overvoltage protection circuit and computer system power supply Download PDF

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Publication number
CN111668808A
CN111668808A CN202010536996.3A CN202010536996A CN111668808A CN 111668808 A CN111668808 A CN 111668808A CN 202010536996 A CN202010536996 A CN 202010536996A CN 111668808 A CN111668808 A CN 111668808A
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CN
China
Prior art keywords
resistor
voltage
comparator
reference voltage
overvoltage protection
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Withdrawn
Application number
CN202010536996.3A
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Chinese (zh)
Inventor
杨舜量
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Suzhou Inspur Intelligent Technology Co Ltd
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Suzhou Inspur Intelligent Technology Co Ltd
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Priority to CN202010536996.3A priority Critical patent/CN111668808A/en
Publication of CN111668808A publication Critical patent/CN111668808A/en
Withdrawn legal-status Critical Current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
    • 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
    • G01R19/16504—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 components employed
    • 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
    • G01R19/16504—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 components employed
    • G01R19/16523—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 components employed using diodes, e.g. Zener diodes
    • 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
    • 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
    • H02H3/006—Calibration or setting of parameters
    • 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
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • H02H3/042—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned combined with means for locating the fault

Abstract

The invention discloses an overvoltage protection circuit and a computer system power supply, wherein the overvoltage protection circuit comprises the following components: the anodes of the diodes are respectively connected with a multi-path voltage source, the cathodes of the diodes are connected together, and the output voltage value is a first reference voltage; the circuit comprises a first resistor and a second resistor, wherein the first resistor and the second resistor are connected in series, the other end of the first resistor is connected with the cathodes of a plurality of diodes so as to receive a first reference voltage, and the other end of the second resistor is grounded; and the negative input end of the comparator is connected between the first resistor and the second resistor, the positive input end of the comparator is connected with the reference voltage of the comparator, and the output end of the comparator outputs a judgment signal so as to confirm whether the overvoltage occurs or not according to the judgment signal. The invention can conveniently set the protection point of each voltage overvoltage through the comparator judging circuit and the resistor voltage division, has high response speed, and can inform the system of abnormity without the operation of a controller so as to close the system main power supply.

Description

Overvoltage protection circuit and computer system power supply
Technical Field
The invention relates to the technical field of circuit protection, in particular to an overvoltage protection circuit and a computer system power supply.
Background
Fig. 1 is a schematic diagram illustrating an application of a POL overvoltage protection circuit in the prior art, wherein the POL detects an external output voltage Vout through FB feedback, and then compares a voltage signal with an internal comparator OV _ TH. If the output voltage is higher than OV _ TH, the comparator will output high level signal to inform the internal logic control, so that the logic control can judge whether the output voltage is abnormal, and if the output voltage is abnormal, PG (Power good) pin outputs low level signal to inform the system. Otherwise, the PG pin outputs a high level signal, which represents that the output voltage is normal. The technology aims at the monitoring of a power module and an IC chip or a single body, and the monitoring of the electric power supply voltage of a multi-path system cannot be realized.
Fig. 2 is a schematic diagram of an application of an overvoltage protection circuit of a digital controller such as an MCU or an FPGA in the prior art, which monitors power supplies on each system, for example, +12V,5V, +3.3V, +1.8V, etc., by collection. The collected voltage signals are judged by a microprocessor which is preset in each group of voltage OVP, if any voltage is abnormal, the output signals output low-level signals to inform system abnormal information. By using ADC function, each power voltage can be inputted to the digital controller as analog signal, and the ADC function of the controller converts the analog signal into digital signal, and by using internal program code mode, the instruction can be easily judged to judge that when the voltage is greater than the overvoltage, the system can be immediately sent out to warn system or further shut down the system. The digital controller has a lower response speed than hardware and requires more GPIO pins to set the ADC function, which greatly increases the cost.
Disclosure of Invention
In view of the above, an embodiment of the present invention provides an overvoltage protection circuit and a computer system power supply, which can conveniently set a protection point of each voltage overvoltage through a comparator determination circuit and a resistor voltage division, and notify a system abnormality without a response speed through an operation of a controller, so as to turn off a system main power supply.
In view of the above object, an aspect of the embodiments of the present invention provides an overvoltage protection circuit, including the following components: the anodes of the diodes are respectively connected with a multi-path voltage source, the cathodes of the diodes are connected together, and the output voltage value is a first reference voltage; the circuit comprises a first resistor and a second resistor, wherein the first resistor and the second resistor are connected in series, the other end of the first resistor is connected with the cathodes of a plurality of diodes so as to receive a first reference voltage, and the other end of the second resistor is grounded; and the negative input end of the comparator is connected between the first resistor and the second resistor, the positive input end of the comparator is connected with the reference voltage of the comparator, and the output end of the comparator outputs a judgment signal so as to confirm whether the overvoltage occurs or not according to the judgment signal.
In some embodiments, further comprising: and the alarm device is connected with the output end of the comparator so as to confirm whether the overvoltage occurs or not according to the judgment signal and output an alarm.
In some embodiments, the first reference voltage is set as a difference between an overvoltage protection threshold of the voltage source and a diode forward voltage, and the first resistance and the second resistance are set based on the first reference voltage and the comparator reference voltage.
In some embodiments, further comprising: the diode comprises a third resistor and a fourth resistor, wherein the third resistor and the fourth resistor are connected in series, the other end of the third resistor is connected with a voltage source, the other end of the fourth resistor is grounded, and the anode of the diode is connected between the third resistor and the fourth resistor.
In some embodiments, the third resistor and the fourth resistor are set based on a sum of an overvoltage protection threshold of the voltage source and the first reference voltage and a diode forward voltage.
In another aspect of the embodiments of the present invention, there is also provided a computer system power supply, including an overvoltage protection circuit, where the overvoltage protection circuit includes: the anodes of the diodes are respectively connected with a multi-path voltage source, the cathodes of the diodes are connected together, and the output voltage value is a first reference voltage; the circuit comprises a first resistor and a second resistor, wherein the first resistor and the second resistor are connected in series, the other end of the first resistor is connected with the cathodes of a plurality of diodes so as to receive a first reference voltage, and the other end of the second resistor is grounded; and the negative input end of the comparator is connected between the first resistor and the second resistor, the positive input end of the comparator is connected with the reference voltage of the comparator, and the output end of the comparator outputs a judgment signal so as to confirm whether the overvoltage occurs or not according to the judgment signal.
In some embodiments, further comprising: and the alarm device is connected with the output end of the comparator so as to confirm whether the overvoltage occurs or not according to the judgment signal and output an alarm.
In some embodiments, the first reference voltage is set as a difference between an overvoltage protection threshold of the voltage source and a diode forward voltage, and the first resistance and the second resistance are set based on the first reference voltage and the comparator reference voltage.
In some embodiments, further comprising: the diode comprises a third resistor and a fourth resistor, wherein the third resistor and the fourth resistor are connected in series, the other end of the third resistor is connected with a voltage source, the other end of the fourth resistor is grounded, and the anode of the diode is connected between the third resistor and the fourth resistor.
In some embodiments, the third resistor and the fourth resistor are set based on an overvoltage protection threshold of the voltage source and a sum of the first reference voltage and a diode forward voltage.
The invention has the following beneficial technical effects: the comparator judges the circuit and the resistor divides the voltage to set the protection point of each voltage overvoltage conveniently, and the response speed can inform the system of abnormity without the operation of a controller, thereby closing the main power supply of the system.
Drawings
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 description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained by using the drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art POL overvoltage protection circuit;
FIG. 2 is a schematic diagram of an overvoltage protection circuit of a digital controller such as an MCU and an FPGA in the prior art;
FIG. 3 is a schematic diagram of an embodiment of an over-voltage protection circuit provided by the present invention;
fig. 4 is a schematic diagram of an embodiment of an overvoltage protection circuit provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.
In view of the above object, a first aspect of an embodiment of the present invention provides an overvoltage protection circuit. Fig. 3 is a schematic diagram of an embodiment of an overvoltage protection circuit provided by the present invention. As shown in fig. 3, an embodiment of the present invention includes the following components:
several diodes D1, D2, … … Dn, several diodes D1, D2, … … Dn with positive poles connected to multiple voltage sources V1, V2, … … Vn, negative poles connected together and output voltage value as the first reference voltage VDET；
A first resistor R1 and a second resistor R2, the first resistor R1 and the second resistor R2 are connected in series, and the other end of the first resistor R1 is connected with the cathodes of a plurality of diodes D1, D2 and … … Dn to receive a first reference voltage VDETThe other end of the second resistor R2 is grounded; and
a Comparator, the negative input terminal of which is connected between the first resistor R1 and the second resistor R2, and the positive input terminal is connected to the reference voltage V of the ComparatorREFAnd the output end outputs a judgment signal Alt # to confirm whether the overvoltage exists according to the judgment signal Alt #.
Taking the first path voltage source V1 as an example, the working voltage of the voltage source V1 during normal operation is 1.8V, the over-voltage protection threshold is set to be 2.1V, and the first reference voltage VDETThe first reference voltage V is the difference between the over-voltage protection threshold and the forward voltage of the diode D1, i.e. the forward voltage of the diode D1 is 0.5VDET1.6V, by firstThe resistor R1 and the second resistor R2 are coupled to a first reference voltage VDETPerforming voltage division to make the divided voltage and the reference voltage V of the comparatorREFEqual, with comparator reference voltage VREFFor example, 1.5V, the divided voltage 1.5V is input to the negative input terminal of the Comparator, and the Comparator refers to the voltage VREFThe output end of the Comparator Comparator outputs a judgment signal Alt #, so as to judge whether the voltage source is higher than the overvoltage protection threshold value.
The first reference voltage V when the voltage source V1 is operating normally or within an over-voltage protection thresholdDETLess than or equal to 1.6V, and the voltage value after the voltage division of the first resistor R1 and the second resistor R2 is less than or equal to 1.5V, namely less than or equal to the reference voltage V of the comparatorREFThe Comparator outputs high level and the circuit is normal.
The first reference voltage V1 operates above an over-voltage protection thresholdDETIs more than 1.6V, and the voltage value after the voltage division of the first resistor R1 and the second resistor R2 is more than 1.5V, namely more than the reference voltage V of the comparatorREFThe Comparator outputs a low level, at which time the circuit alarms to cut off the power.
In some embodiments, further comprising: and the alarm device is connected with the output end of the comparator so as to confirm whether the overvoltage occurs or not according to the judgment signal and output an alarm. When the warning device receives a high level, the circuit is normal, and the LED lamp of the warning device is normally on; when the warning device receives a low level signal, the LED lamp flickers to give an alarm, and the voltage source circuit is cut off.
In some embodiments, the first reference voltage is set as a difference between an overvoltage protection threshold of the voltage source and a diode forward voltage, and the first resistance and the second resistance are set based on the first reference voltage and the comparator reference voltage.
With continued reference to FIG. 3, the first reference voltage VDETSet as the difference between the overvoltage protection threshold of the voltage source V1 and the forward voltage of the diode D1, the first resistor R1 and the second resistor R2 are based on a first reference voltage V2DETAnd comparator reference voltage VREFThe setting is performed. To be provided withThe first path of voltage source V1 is taken as an example, the working voltage of the voltage source V1 during normal operation is 1.8V, the over-voltage protection threshold is set to be 2.1V, and the first reference voltage VDETThe first reference voltage V is the difference between the over-voltage protection threshold and the forward voltage of the diode D1, i.e. the forward voltage of D1 is 0.5VDETIt was 1.6V. With reference voltage V of comparatorREFFor example, 1.5V, the first resistor R1 and the second resistor R2 should be in accordance with a ratio of (1.6V-1.5V): 1.5V, i.e. 1: 15.
In some embodiments, further comprising: the diode comprises a third resistor and a fourth resistor, wherein the third resistor and the fourth resistor are connected in series, the other end of the third resistor is connected with a voltage source, the other end of the fourth resistor is grounded, and the anode of the diode is connected between the third resistor and the fourth resistor.
Fig. 4 is a schematic diagram of an embodiment of an overvoltage protection circuit provided by the present invention. As shown in fig. 4, the method further includes: the voltage source is characterized by comprising a third resistor R3 and a fourth resistor R4, wherein the third resistor R3 and the fourth resistor R4 are connected in series, the other end of the third resistor R3 is connected with a voltage source V2, the other end of the fourth resistor R4 is grounded, and the anode of a diode D2 is connected between the third resistor R3 and the fourth resistor R4.
Taking the second path of voltage source V2 as an example, the working voltage of the voltage source V2 when working normally is 3.3V, the overvoltage protection threshold is set to be 3.6V, the overvoltage protection threshold is divided by the third resistor R3 and the fourth resistor R4, the voltage obtained after voltage division is 2.1V and is added to the anode of the diode D2, taking the forward voltage of D2 as 0.5V as an example, the first reference voltage VDETIs 1.6V, and is coupled to a first reference voltage V via a first resistor R1 and a second resistor R2DETPerforming voltage division to make the divided voltage and the reference voltage V of the comparatorREFEqual, with comparator reference voltage VREFFor example, 1.5V, the divided voltage 1.5V is input to the negative input terminal of the Comparator, and the Comparator refers to the voltage VREFThe output end of the Comparator Comparator outputs a judgment signal Alt #, so as to judge whether the voltage source is higher than the overvoltage protection threshold value.
When the voltage source V2 is operating normally or within an overvoltage protection thresholdA reference voltage VDETLess than or equal to 1.6V, and the voltage value after the voltage division of the first resistor R1 and the second resistor R2 is less than or equal to 1.5V, namely less than or equal to the reference voltage V of the comparatorREFThe Comparator outputs high level and the circuit is normal.
The first reference voltage V2 operates above an over-voltage protection thresholdDETIs more than 1.6V, and the voltage value after the voltage division of the first resistor R1 and the second resistor R2 is more than 1.5V, namely more than the reference voltage V of the comparatorREFThe Comparator outputs a low level, at which time the circuit alarms to cut off the power.
In some embodiments, the third resistor and the fourth resistor are set based on an overvoltage protection threshold of the voltage source and a difference between the first reference voltage and a diode forward voltage.
With continued reference to FIG. 4, the third resistor R3 and the fourth resistor R4 are based on the overvoltage protection threshold of the voltage source V2 and the first reference voltage VDETAnd the sum of the forward voltages of the diodes D2. Taking the second voltage source V2 as an example, the working voltage of the voltage source V2 during normal operation is 3.3V, the over-voltage protection threshold is set to be 3.6V, and the first reference voltage V is set to beDETAnd the sum of the forward voltage of the diode D2 is 2.1V, the third resistor R3 and the fourth resistor R4 are required to be in accordance with the ratio of (3.6V-2.1V): 2.1V, i.e. 5: 7, setting.
In view of the above object, according to a second aspect of the embodiments of the present invention, there is provided a computer system power supply, including an overvoltage protection circuit, the overvoltage protection circuit including: the anodes of the diodes are respectively connected with a multi-path voltage source, the cathodes of the diodes are connected together, and the output voltage value is a first reference voltage; the circuit comprises a first resistor and a second resistor, wherein the first resistor and the second resistor are connected in series, the other end of the first resistor is connected with the cathodes of a plurality of diodes so as to receive a first reference voltage, and the other end of the second resistor is grounded; and the negative input end of the comparator is connected between the first resistor and the second resistor, the positive input end of the comparator is connected with the reference voltage of the comparator, and the output end of the comparator outputs a judgment signal so as to confirm whether the overvoltage occurs or not according to the judgment signal.
In some embodiments, further comprising: and the alarm device is connected with the output end of the comparator so as to confirm whether the overvoltage occurs or not according to the judgment signal and output an alarm.
In some embodiments, the first reference voltage is set as a difference between an overvoltage protection threshold of the voltage source and a diode forward voltage, and the first resistance and the second resistance are set based on the first reference voltage and the comparator reference voltage.
In some embodiments, further comprising: the diode comprises a third resistor and a fourth resistor, wherein the third resistor and the fourth resistor are connected in series, the other end of the third resistor is connected with a voltage source, the other end of the fourth resistor is grounded, and the anode of the diode is connected between the third resistor and the fourth resistor.
In some embodiments, the third resistor and the fourth resistor are set based on an overvoltage protection threshold of the voltage source and a sum of the first reference voltage and a diode forward voltage.
It should be noted that the above description and extension of the protection circuit can be applied to a power supply of a computer system, and are not repeated herein for brevity of the technical solution of the present application.
The foregoing is an exemplary embodiment of the present disclosure, but it should be noted that various changes and modifications could be made herein without departing from the scope of the present disclosure as defined by the appended claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
It should be understood that, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly supports the exception. It should also be understood that "and/or" as used herein is meant to include any and all possible combinations of one or more of the associated listed items.
The numbers of the embodiments disclosed in the embodiments of the present invention are merely for description, and do not represent the merits of the embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of the embodiments of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.

Claims (10)

1. An overvoltage protection circuit, characterized in that the overvoltage protection circuit comprises:
the anodes of the diodes are respectively connected with a multi-path voltage source, the cathodes of the diodes are connected together, and the output voltage value is a first reference voltage;
the first resistor and the second resistor are connected in series, the other end of the first resistor is connected with the cathodes of the diodes to receive the first reference voltage, and the other end of the second resistor is grounded; and
and the negative input end of the comparator is connected between the first resistor and the second resistor, the positive input end of the comparator is connected with the reference voltage of the comparator, and the output end of the comparator outputs a judgment signal so as to determine whether the overvoltage occurs or not according to the judgment signal.
2. The overvoltage protection circuit of claim 1, further comprising:
and the alarm device is connected with the output end of the comparator so as to confirm whether the overvoltage occurs or not and output an alarm according to the judgment signal.
3. The overvoltage protection method of claim 1, wherein the first reference voltage is set as a difference between an overvoltage protection threshold of the voltage source and the diode forward voltage, and the first resistance and the second resistance are set based on the first reference voltage and the comparator reference voltage.
4. The overvoltage protection method of claim 1, further comprising:
the diode comprises a third resistor and a fourth resistor, wherein the third resistor and the fourth resistor are connected in series, the other end of the third resistor is connected with a voltage source, the other end of the fourth resistor is grounded, and the anode of the diode is connected between the third resistor and the fourth resistor.
5. The overvoltage protection method of claim 4, wherein the third resistor and the fourth resistor are set based on an overvoltage protection threshold of the voltage source and a sum of the first reference voltage and the diode forward voltage.
6. A computer system power supply comprising an overvoltage protection circuit, said overvoltage protection circuit comprising:
the anodes of the diodes are respectively connected with a multi-path voltage source, the cathodes of the diodes are connected together, and the output voltage value is a first reference voltage;
the first resistor and the second resistor are connected in series, the other end of the first resistor is connected with the cathodes of the diodes to receive the first reference voltage, and the other end of the second resistor is grounded; and
and the negative input end of the comparator is connected between the first resistor and the second resistor, the positive input end of the comparator is connected with the reference voltage of the comparator, and the output end of the comparator outputs a judgment signal so as to determine whether the overvoltage occurs or not according to the judgment signal.
7. The computer system power supply of claim 6, further comprising:
and the alarm device is connected with the output end of the comparator so as to confirm whether the overvoltage occurs or not and output an alarm according to the judgment signal.
8. The computer system power supply of claim 6, wherein the first reference voltage is set as a difference between an over-voltage protection threshold of the voltage source and the diode forward voltage, the first resistance and the second resistance being set based on the first reference voltage and the comparator reference voltage.
9. The computer system power supply of claim 6, further comprising:
the diode comprises a third resistor and a fourth resistor, wherein the third resistor and the fourth resistor are connected in series, the other end of the third resistor is connected with a voltage source, the other end of the fourth resistor is grounded, and the anode of the diode is connected between the third resistor and the fourth resistor.
10. The computer system power supply of claim 9, wherein the third resistor and the fourth resistor are set based on an overvoltage protection threshold of the voltage source and a sum of the first reference voltage and the diode forward voltage.
CN202010536996.3A 2020-06-12 2020-06-12 Overvoltage protection circuit and computer system power supply Withdrawn CN111668808A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010536996.3A CN111668808A (en) 2020-06-12 2020-06-12 Overvoltage protection circuit and computer system power supply

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Application Number Priority Date Filing Date Title
CN202010536996.3A CN111668808A (en) 2020-06-12 2020-06-12 Overvoltage protection circuit and computer system power supply

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CN111668808A true CN111668808A (en) 2020-09-15

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117277825A (en) * 2023-11-22 2023-12-22 长城电源技术有限公司 Power failure control circuit, control method and power converter
CN117458393A (en) * 2023-12-20 2024-01-26 天津航空机电有限公司 Protection circuit and protection method for electric equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117277825A (en) * 2023-11-22 2023-12-22 长城电源技术有限公司 Power failure control circuit, control method and power converter
CN117277825B (en) * 2023-11-22 2024-01-30 长城电源技术有限公司 Power failure control circuit, control method and power converter
CN117458393A (en) * 2023-12-20 2024-01-26 天津航空机电有限公司 Protection circuit and protection method for electric equipment

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Application publication date: 20200915

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