CN215870730U - Overvoltage protection circuit - Google Patents
Overvoltage protection circuit Download PDFInfo
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- CN215870730U CN215870730U CN202121372307.6U CN202121372307U CN215870730U CN 215870730 U CN215870730 U CN 215870730U CN 202121372307 U CN202121372307 U CN 202121372307U CN 215870730 U CN215870730 U CN 215870730U
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Abstract
The embodiment of the application provides an overvoltage protection circuit, and this overvoltage protection circuit includes voltage stabilizing circuit, control circuit, switch and voltage output end, and control circuit is connected with voltage stabilizing circuit, and the switch is connected with control circuit, and the voltage output end is connected with the switch. When the output voltage of the voltage stabilizing circuit is less than or equal to the preset voltage, the control circuit controls the switch to be conducted so that the voltage output end is connected with the voltage stabilizing circuit; when the output voltage of the voltage stabilizing circuit is greater than the preset voltage, the control circuit controls the switch to be disconnected so as to disconnect the voltage output end from the voltage stabilizing circuit. The overvoltage protection circuit can ensure the stability of circuits in electronic equipment.
Description
Technical Field
The utility model relates to the field of circuits, in particular to an overvoltage protection circuit.
Background
For most electronic products, the basic condition for ensuring safe and reliable operation is a stable input supply voltage. In practical situations, the external power source may have an unsuitable condition, such as an unstable external power source, and if the electronic device is connected to the external power source, subsequent important circuits and electronic components in the electronic device may be abnormal or even damaged. Therefore, certain measures need to be taken to ensure the stability of the circuits in the electronic device.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides an overvoltage protection circuit to guarantee the stability of a circuit in electronic equipment.
The embodiment of the application provides an overvoltage crowbar, includes:
a voltage stabilizing circuit;
the control circuit is connected with the voltage stabilizing circuit;
a switch connected to the control circuit;
a voltage output terminal connected to the switch;
when the output voltage of the voltage stabilizing circuit is less than or equal to the preset voltage, the control circuit controls the switch to be conducted so that the voltage output end is connected with the voltage stabilizing circuit;
when the output voltage of the voltage stabilizing circuit is greater than the preset voltage, the control circuit controls the switch to be disconnected so as to disconnect the voltage output end from the voltage stabilizing circuit.
In some embodiments, the control circuit comprises:
the first resistor is connected with the voltage stabilizing circuit;
the second resistor is connected with the first resistor and grounded;
the triode, the triode includes the first utmost point, the second utmost point and third utmost point, the first utmost point with voltage stabilizing circuit connects, the second utmost point is connected with clamping circuit, clamping circuit ground connection, the third utmost point is connected first resistance with between the second resistance, the third utmost point the switch is connected, the third utmost point be used for to switch output control voltage.
In some embodiments, the control circuit further comprises:
the third resistor is connected with the clamping circuit and the voltage stabilizing circuit;
a fourth resistor connected between the third resistor and the clamp circuit, and the fourth resistor connected with the second pole.
In some embodiments, the clamping circuit comprises a zener diode.
In some embodiments, the control circuit comprises:
and the comparator is connected with the voltage stabilizing circuit and the switch and used for comparing the magnitude relation between the output voltage of the voltage stabilizing circuit and the preset voltage.
In some embodiments, the switch comprises:
the first port is connected with the voltage stabilizing circuit;
a second port connected to the control circuit;
a third port connected to the power output;
when the output voltage of the voltage stabilizing circuit is less than or equal to the preset voltage, the control circuit controls the first port to be communicated with the third port;
when the output voltage of the voltage stabilizing circuit is greater than the preset voltage, the control circuit controls the first port and the third port to be disconnected.
In some embodiments, the switch further comprises:
the field effect transistor comprises a source electrode, a grid electrode and a drain electrode, wherein the source electrode is the first port, the grid electrode is the second port, and the drain electrode is the third port.
In some embodiments, the overvoltage protection circuit further comprises a voltage input;
the voltage stabilizing circuit comprises a linear voltage stabilizer, wherein the linear voltage stabilizer comprises a fourth port, a fifth port and a sixth port, the fourth port is connected with the voltage input end, the fifth port is grounded, and the sixth port is connected with the control circuit.
In some embodiments, the overvoltage protection circuit further comprises:
and the fifth resistor is connected with the linear voltage stabilizer and the voltage input end.
In some embodiments, the overvoltage protection circuit further comprises:
the first capacitor is connected between the voltage stabilizing circuit and the control circuit and is grounded;
a second capacitor connected between the control circuit and the switch and grounded.
The overvoltage protection circuit provided by the embodiment of the application comprises a voltage stabilizing circuit, a control circuit, a switch and a voltage output end, wherein the control circuit is connected with the voltage stabilizing circuit, the switch is connected with the control circuit, and the voltage output end is connected with the switch. When the output voltage of the voltage stabilizing circuit is less than or equal to the preset voltage, the control circuit controls the switch to be conducted so that the voltage output end is connected with the voltage stabilizing circuit; when the output voltage of the voltage stabilizing circuit is greater than the preset voltage, the control circuit controls the switch to be disconnected so as to disconnect the voltage output end from the voltage stabilizing circuit. It can be understood that, when the output voltage is too high due to the abnormal operation of the voltage stabilizing circuit, the control circuit controls the switch to be turned off so that the voltage output end cannot output the operating voltage, thereby ensuring that the circuit in the electronic device is always in a stable state.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic diagram of a first structure of an overvoltage protection circuit according to an embodiment of the present disclosure.
Fig. 2 is a schematic diagram of a second structure of the overvoltage protection circuit according to the embodiment of the present application.
Fig. 3 is a schematic structural diagram of an equivalent transformation under a normal condition of the overvoltage protection circuit provided in the embodiment of the present application.
Fig. 4 is a schematic structural diagram of equivalent transformation under an abnormal condition of the overvoltage protection circuit provided in the embodiment of the present application.
Fig. 5 is an enlarged view of the control circuit of fig. 2.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all 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 application.
The embodiment of the application provides an overvoltage protection voltage to ensure the stability of a circuit in electronic equipment. The following description will be made with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic diagram of a first structure of an overvoltage protection voltage according to an embodiment of the present disclosure. The overvoltage protection circuit 100 is installed in an electronic device 200 for providing a proper operating voltage to the electronic device 200, for example, the electronic device 200 may be a mobile phone, a computer, or an electric vehicle.
The overvoltage protection circuit 100 includes a voltage regulator circuit 10, a control circuit 20, a switch 30, and a voltage output UO. The control circuit 20 is connected with the voltage stabilizing circuit 10, the switch 30 is connected with the control circuit 20, and the voltage output end UO is connected with the switch 30. When the output voltage of the voltage stabilizing circuit 10 is less than or equal to the preset voltage, the control circuit 20 controls the switch 30 to be turned on, so that the voltage output end UO is connected with the voltage stabilizing circuit 10; when the output voltage of the regulator circuit 10 is greater than the preset voltage, the control circuit 20 controls the switch 30 to be turned off to disconnect the voltage output terminal UO from the regulator circuit 10.
When the output voltage of the voltage stabilizing circuit 10 is greater than the preset voltage, the control circuit 20 is triggered to start the protection mechanism, and the control circuit 20 controls the switch 30 to disconnect; when the output voltage of the voltage stabilizing circuit 10 is less than or equal to the preset voltage, the control circuit 20 is not triggered to start the protection mechanism, and the control circuit 20 controls the switch 30 to be turned on, so that the voltage output terminal UO is connected to the voltage stabilizing circuit 10 for providing the proper working voltage for the electronic device 200. It is understood that the predetermined voltage may be the maximum voltage that the electronic device 200 can withstand.
For example, the maximum voltage that the electronic device 200 can withstand is 20V, and the voltage for optimal operation is 18V. When the voltage stabilizing circuit 10 works normally, and the voltage output by the voltage stabilizing circuit 10 is 18V to 20V, the protection mechanism of the control circuit 20 is not triggered, and the control circuit 20 controls the switch 30 to be turned on, so that the output voltage output by the voltage stabilizing circuit 10 is provided to the electronic device 200 through the voltage output terminal UO for use. When the voltage stabilizing circuit 10 is abnormal, that is, the output voltage is greater than 20V, the protection mechanism of the control circuit 20 is triggered, and the control circuit 20 controls the switch 30 to be disconnected, so that the voltage stabilizing circuit 10 cannot provide the output voltage for the electronic device 200.
The overvoltage protection circuit 100 provided by the embodiment of the application comprises a voltage stabilizing circuit 10, a control circuit 20, a switch 30 and a voltage output end UO, wherein the control circuit 20 is connected with the voltage stabilizing circuit 10, the switch 30 is connected with the control circuit 20, and the voltage output end UO is connected with the switch 30. When the output voltage of the voltage stabilizing circuit 10 is less than or equal to the preset voltage, the control circuit 20 controls the switch 30 to be turned on, so that the voltage output end UO is connected with the voltage stabilizing circuit 10; when the output voltage of the regulator circuit 10 is greater than the preset voltage, the control circuit 20 controls the switch 30 to be turned off to disconnect the voltage output terminal UO from the regulator circuit 10. It can be understood that, when the output voltage is too high due to the abnormal operation of the voltage stabilizing circuit 10, the control circuit 20 controls the switch 30 to be turned off so that the voltage output terminal UO cannot output the operating voltage, thereby ensuring that the circuit in the electronic device 200 is always in a stable state.
Referring to fig. 2 and fig. 5, fig. 2 is a schematic diagram of a second structure of the overvoltage protection circuit according to an embodiment of the present application, and fig. 5 is an enlarged view of a structure of the control circuit of fig. 2.
The control circuit 20 includes a first resistor R1, a second resistor R2 and a transistor Q1, the first resistor R1 is connected to the voltage stabilizing circuit 10, the second resistor R2 is connected to the first resistor R1 and grounded, the transistor Q1 includes a first pole e, a second pole b and a third pole c, the first pole e is connected to the voltage stabilizing circuit 10, the second pole b is connected to the clamp circuit D1, the clamp circuit D1 is grounded, the third pole c is connected between the first resistor R1 and the second resistor R2 and connected to the switch 30, and the third pole c is used for outputting a control voltage.
Referring to fig. 3 and fig. 4, fig. 3 is a schematic structural diagram of an equivalent transformation under a normal condition of the overvoltage protection circuit provided in the embodiment of the present application, and fig. 4 is a schematic structural diagram of an equivalent transformation under an abnormal condition of the overvoltage protection circuit provided in the embodiment of the present application.
When the overvoltage protection circuit 100 is in normal operation, that is, when the output voltage of the regulator circuit 10 is less than or equal to the predetermined voltage, the transistor Q1 is turned off, so that the voltage of the third pole c is the divided voltage of the first resistor R1 and the second resistor R2, and the voltage at the two ends of the first resistor R1 and the second resistor R2 is the output voltage of the regulator circuit 10, and the divided voltage is the voltage value at the two ends of the first resistor R1, and the divided voltage value is smaller than the output voltage. The control circuit 20 provides the switch 30 with the divided voltage value, the voltage stabilizing circuit 10 provides the switch 30 with the output voltage, and the switch 30 determines that the divided voltage provided by the control circuit 20 is smaller than the output voltage provided by the voltage stabilizing circuit 10, then the switch 30 is connected, so that the voltage stabilizing circuit 10 provides the voltage for the electronic device 200 to use.
For example, the voltage supplied by the voltage stabilizing circuit 10 is Uo, the voltage of the third pole c is the divided voltage of the first resistor R1 and the second resistor R2, and the divided voltage is Uo R1/(R1+ R2), so the control circuit 20 supplies the divided voltage to the switch 30, the voltage supplied by the voltage stabilizing circuit 10 to the switch 30 is Uo, the voltage supplied by the control circuit 20 to the switch 30 is Uo R1/(R1+ R2), and the switch 30 determines that the voltage supplied by the control circuit 20 to the switch 30 is Uo R1/(R1+ R2) smaller than the voltage Uo supplied by the voltage stabilizing circuit to the switch 30, so the switch 30 is turned on, so that the voltage stabilizing circuit 10 supplies the voltage Uo to the electronic device 200.
When the overvoltage protection circuit 100 operates abnormally, that is, when the output voltage of the regulator circuit 10 is greater than the preset voltage, the voltage of the second pole b of the transistor Q1 is stabilized due to the clamping circuit D1. When the voltage of the first pole e is greater than the voltage of the third pole c, the transistor Q1 is turned on, so that the first resistor R1 is short-circuited. At this time, the value of the voltage supplied to the switch 30 by the control circuit 20 is the same as the value of the output voltage of the stabilizing circuit 10, and if the switch 30 determines that the divided voltage supplied by the control circuit 20 is equal to the output voltage supplied by the stabilizing circuit 10, the switch 30 is turned off, so that the stabilizing circuit 10 cannot supply the voltage to the electronic device 200 for use.
For example, when the operation of the overvoltage protection circuit 100 is abnormal, that is, when the voltage output by the regulator circuit 10 is greater than the preset voltage, due to the action of the clamping circuit D1, the voltage of the second pole b of the transistor Q1 is stable and unchanged, when the voltage of the first pole e is greater than the voltage of the third pole c, for example, the voltage of the first pole e is greater than the voltage of the third pole c by 0.7V, the transistor Q1 is turned on, the first resistor R1 is short-circuited at the moment, the voltage at the point a is the output voltage Uo of the regulator circuit 10, the voltage provided by the regulator circuit 10 to the switch 30 is Uo, and the voltage provided by the control circuit 20 to the switch 30 is Uo, the switch 30 determines that the voltage Uo provided by the control circuit 20 is equal to the voltage Uo provided by the regulator circuit 10, and the switch 30 is turned off, so that the regulator circuit 10 does not provide the voltage Uo to the electronic device 200.
Referring to fig. 5, the control circuit 20 further includes a third resistor R3 and a fourth resistor R4, the third resistor R3 is connected to the clamp circuit D1 and the regulator circuit 10, and the fourth resistor R4 is connected between the third resistor R3 and the clamp circuit D1 and connected to the second pole b.
The third resistor R3 is connected to the clamp circuit D1, and since the clamp circuit D1 is grounded, the voltages at the two ends of the third resistor R3 and the clamp circuit D1 are the voltages output by the voltage stabilizing circuit 10, and the third resistor R3 divides the voltage of the clamp circuit D1, so that the voltages at the two ends of the clamp circuit D1 are smaller than the voltage output by the voltage stabilizing circuit 10, and the clamp circuit D1 is prevented from being damaged due to the excessively large voltages at the two ends of the clamp voltage. The fourth resistor R4 is connected to the transistor Q1 and the clamp circuit D1, and the fourth resistor R4 also divides the voltage of the clamp circuit D1 and the transistor Q1, so that the voltages at the two ends of the clamp circuit D1 and the second pole b of the transistor Q1 are reduced.
The clamping circuit D1 comprises a voltage stabilizing diode. The clamping function of the zener diode is to limit the potential of the second pole b of the transistor Q1 by using the characteristic that the conduction voltage drop of the anode of the diode is stable and the value is small.
In some embodiments, the control circuit 20 includes a comparator coupled to the stabilizing circuit 10 and the switch 30. The comparator is used for comparing the magnitude relation between the output voltage of the voltage stabilizing circuit 10 and a preset voltage. When the output voltage of the voltage stabilizing circuit 10 is less than or equal to the preset voltage, the comparator controls the switch 30 to be turned on, so that the voltage output end UO is connected with the voltage stabilizing circuit 10; when the output voltage of the voltage stabilizing circuit 10 is greater than the preset voltage, the comparator controls the switch 30 to be turned off to disconnect the voltage output terminal UO from the voltage stabilizing circuit 10.
Referring to fig. 2, the switch 30 includes a first port, a second port and a third port. The first port is connected with the voltage stabilizing circuit 10, the second port is connected with the control circuit 20, and the third port is connected with the power output end. When the output voltage of the voltage stabilizing circuit 10 is less than or equal to the preset voltage, the control circuit 20 controls the first port to be connected with the third port, so that the voltage output end UO is connected with the voltage stabilizing circuit 10, and when the output voltage of the voltage stabilizing circuit 10 is greater than the preset voltage, the control circuit 20 controls the first port to be disconnected with the third port, so that the connection between the voltage output end UO and the voltage stabilizing circuit 10 is disconnected. It can be understood that, when the output voltage of the regulator circuit 10 is less than or equal to the predetermined voltage, the control circuit 20 starts the protection mechanism, the voltage transmitted to the second port of the switch 30 is equal to the output voltage of the regulator circuit 10, and the first port is disconnected from the third port to disconnect the voltage output terminal UO from the regulator circuit 10. When the output voltage of the voltage stabilizing circuit 10 is greater than the preset voltage, the control circuit 20 does not start the protection mechanism, and the voltage transmitted to the second port of the switch 30 is less than the output voltage of the voltage stabilizing circuit 10, so that the first port and the third port are conducted, and the voltage output end UO is connected to the voltage stabilizing circuit 10.
For example, the switch 30 may be a single pole double throw switch 30, a field effect transistor Q2, or the like. The field effect transistor Q2 may be a metal-oxide semiconductor field effect transistor Q2 (MOS-FET). Illustratively, when the switch 30 is a MOS-FET transistor, the MOS-FET transistor includes a Source (S), a Gate (Gate, G), and a Drain (Drain, D), it being understood that the Source is the first port, the Gate is the second port, and the Drain is the third port. Wherein, the source is connected with the voltage stabilizing circuit 10, the grid is connected with the control circuit 20, and the drain is connected with the power output terminal. When the output voltage of the voltage stabilizing circuit 10 is less than or equal to the preset voltage, the source and the drain are conducted, so that the voltage output end UO is connected to the voltage stabilizing circuit 10, and when the output voltage of the voltage stabilizing circuit 10 is greater than the preset voltage, the source and the drain are disconnected, so that the connection between the voltage output end UO and the voltage stabilizing circuit 10 is disconnected.
With continued reference to fig. 1 and 2, the overvoltage protection circuit 100 further includes a voltage input terminal UIN, and the voltage regulator circuit 10 includes a linear regulator, and the display receives a voltage input from the voltage input terminal UIN during use to generate a regulated output voltage to maintain the voltage stable. The linear voltage regulator comprises a fourth port VIN, a fifth port GND and a sixth port VOUT, wherein the fourth port VIN is connected with a voltage input end UIN, the fifth port is grounded, and the sixth port is connected with a control circuit 20.
The overvoltage protection circuit 100 further includes a fifth resistor R5, and the fifth resistor R5 is connected to the voltage regulator and the voltage input terminal UIN. It is understood that the externally input voltage is input to the overvoltage protection circuit 100 through the voltage input terminal UIN, and the fifth resistor R5 is connected between the voltage input terminal UIN and the linear regulator, so as to share a part of the voltage for the linear regulator.
Referring to fig. 2, the overvoltage protection circuit 100 further includes a first capacitor C1, a second capacitor C2, and a third capacitor C3. The first capacitor C1 is connected between the stabilizing circuit 10 and the control circuit 20, and the first capacitor C1 is grounded. The second capacitor C2 is connected between the control circuit 20 and the switch 30, and the second capacitor C2 is grounded. A third capacitor C3 is connected between the voltage input UIN and the linear regulator, said third capacitor C3 being connected to ground. The first capacitor C1, the second capacitor C2 and the third capacitor C3 can prevent voltage from suddenly changing and absorb overvoltage, so that electronic components connected in parallel with the first capacitor C1, the second capacitor C2 and the third capacitor C3 are prevented from being damaged.
The overvoltage protection circuit 100 provided by the embodiment of the application comprises a voltage stabilizing circuit 10, a control circuit 20, a switch 30 and a voltage output end UO, wherein the control circuit 20 is connected with the voltage stabilizing circuit 10, the switch 30 is connected with the control circuit 20, and the voltage output end UO is connected with the switch 30. When the output voltage of the voltage stabilizing circuit 10 is less than or equal to the preset voltage, the control circuit 20 controls the switch 30 to be turned on, so that the voltage output end UO is connected with the voltage stabilizing circuit 10; when the output voltage of the regulator circuit 10 is greater than the preset voltage, the control circuit 20 controls the switch 30 to be turned off to disconnect the voltage output terminal UO from the regulator circuit 10. It can be understood that, when the voltage stabilizing circuit 10 works abnormally, the control circuit 20 controls the switch 30 to be turned off so that the voltage output terminal UO cannot output the working voltage, thereby ensuring that the circuit in the electronic device 200 is always in a stable state.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features.
The overvoltage protection circuit provided by the embodiment of the application is described in detail above. The principles and implementations of the present application are described herein using specific examples, which are presented only to aid in understanding the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. An overvoltage protection circuit, comprising:
a voltage stabilizing circuit;
the control circuit is connected with the voltage stabilizing circuit;
a switch connected to the control circuit;
a voltage output terminal connected to the switch;
when the output voltage of the voltage stabilizing circuit is less than or equal to the preset voltage, the control circuit controls the switch to be conducted so that the voltage output end is connected with the voltage stabilizing circuit;
when the output voltage of the voltage stabilizing circuit is greater than the preset voltage, the control circuit controls the switch to be disconnected so as to disconnect the voltage output end from the voltage stabilizing circuit.
2. The overvoltage protection circuit of claim 1, wherein the control circuit comprises:
the first resistor is connected with the voltage stabilizing circuit;
the second resistor is connected with the first resistor and grounded;
the triode, the triode includes the first utmost point, the second utmost point and third utmost point, the first utmost point with voltage stabilizing circuit connects, the second utmost point is connected with clamping circuit, clamping circuit ground connection, the third utmost point is connected first resistance with between the second resistance, the third utmost point the switch is connected, the third utmost point be used for to switch output control voltage.
3. The overvoltage protection circuit of claim 2, wherein the control circuit further comprises:
the third resistor is connected with the clamping circuit and the voltage stabilizing circuit;
a fourth resistor connected between the third resistor and the clamp circuit, the fourth resistor connected with the second pole.
4. The overvoltage protection circuit of claim 2, wherein:
the clamping circuit comprises a voltage stabilizing diode.
5. The overvoltage protection circuit of claim 1, wherein the control circuit comprises:
and the comparator is connected with the voltage stabilizing circuit and the switch and used for comparing the magnitude relation between the output voltage of the voltage stabilizing circuit and the preset voltage.
6. The overvoltage protection circuit of any one of claims 1 to 5, wherein the switch comprises:
the first port is connected with the voltage stabilizing circuit;
a second port connected to the control circuit;
a third port connected to the power output;
when the output voltage of the voltage stabilizing circuit is less than or equal to the preset voltage, the control circuit controls the first port to be communicated with the third port;
when the output voltage of the voltage stabilizing circuit is greater than the preset voltage, the control circuit controls the first port and the third port to be disconnected.
7. The overvoltage protection circuit of claim 6, wherein the switch further comprises:
the field effect transistor comprises a source electrode, a grid electrode and a drain electrode, wherein the source electrode is the first port, the grid electrode is the second port, and the drain electrode is the third port.
8. The overvoltage protection circuit of any one of claims 1 to 5, wherein:
the overvoltage protection circuit further comprises a voltage input end;
the voltage stabilizing circuit comprises a linear voltage stabilizer, wherein the linear voltage stabilizer comprises a fourth port, a fifth port and a sixth port, the fourth port is connected with the voltage input end, the fifth port is grounded, and the sixth port is connected with the control circuit.
9. The overvoltage protection circuit of claim 8, further comprising:
and the fifth resistor is connected with the linear voltage stabilizer and the voltage input end.
10. The overvoltage protection circuit of any one of claims 1 to 5, further comprising:
the first capacitor is connected between the voltage stabilizing circuit and the control circuit and is grounded;
a second capacitor connected between the control circuit and the switch and grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121372307.6U CN215870730U (en) | 2021-06-18 | 2021-06-18 | Overvoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121372307.6U CN215870730U (en) | 2021-06-18 | 2021-06-18 | Overvoltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215870730U true CN215870730U (en) | 2022-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121372307.6U Active CN215870730U (en) | 2021-06-18 | 2021-06-18 | Overvoltage protection circuit |
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| Country | Link |
|---|---|
| CN (1) | CN215870730U (en) |
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2021
- 2021-06-18 CN CN202121372307.6U patent/CN215870730U/en active Active
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Address after: 518107 201 / F, building C, Xinwangda electronics factory, Tangjia community, Fenghuang street, Guangming District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Xinwangda Energy Technology Co.,Ltd. Address before: 518107 201 / F, building C, Xinwangda electronics factory, Tangjia community, Fenghuang street, Guangming District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN XWODA ELECTRONICS CO.,LTD. |
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