CN215601021U - Overvoltage protection circuit - Google Patents
Overvoltage protection circuit Download PDFInfo
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- CN215601021U CN215601021U CN202122157229.4U CN202122157229U CN215601021U CN 215601021 U CN215601021 U CN 215601021U CN 202122157229 U CN202122157229 U CN 202122157229U CN 215601021 U CN215601021 U CN 215601021U
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- overvoltage protection
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Abstract
The utility model provides an overvoltage protection circuit, which is connected between the output end of a voltage signal and a load, and comprises: the first control switch comprises a control end, a first wiring end and a second wiring end, the first current-limiting resistor and the first voltage-stabilizing tube are connected between the output end of a voltage signal and the control end of the first control switch in series, the second voltage-dividing resistor is connected between the output end of the voltage signal and the first wiring end of the first control switch, the first wiring end of the first control switch is further electrically connected with a load, and the second wiring end of the first control switch is grounded. The overvoltage protection circuit can realize signal turn-off and realize the function of a protection circuit.
Description
Technical Field
The utility model relates to the field of circuit protection, in particular to an overvoltage protection circuit.
Background
In an electronic circuit, a power supply output end (or a voltage detection end) may suddenly rise due to unstable factors such as electromagnetic wave interference and short circuit, and an excessively high voltage may easily cause a load (or a detection circuit connected to the voltage detection end) connected to the power supply output end to burn out, thereby causing a potential safety hazard. Therefore, it is necessary to design an over-voltage protection circuit to solve the above problems.
SUMMERY OF THE UTILITY MODEL
In view of the problems in the prior art, an object of the present invention is to provide an overvoltage protection circuit, which can enable a load to turn off an internal circuit when a voltage is too high, thereby protecting the load.
In order to achieve the above object, the present invention provides an overvoltage protection circuit connected between an output terminal of a voltage signal and a load, the overvoltage protection circuit including: the first control switch comprises a control end, a first wiring end and a second wiring end, the first current-limiting resistor and the first voltage-stabilizing tube are connected between the output end of the voltage signal and the control end of the first control switch in series, the second voltage-dividing resistor is connected between the output end of the voltage signal and the first wiring end of the first control switch, the first wiring end of the first control switch is further electrically connected with the load, and the second wiring end of the first control switch is grounded.
As a selectable scheme, the anode of the first voltage regulator tube is electrically connected to the control end of the first control switch, and the first current-limiting resistor is connected between the cathode of the first voltage regulator tube and the output end of the voltage signal.
As an optional scheme, the first control switch is a triode, a control end of the first control switch is a base electrode of the triode, a first terminal of the first control switch is a collector electrode of the triode, and a second terminal of the first control switch is an emitter electrode of the triode.
As an optional scheme, the first control switch is a field effect transistor, the control terminal of the first control switch is a gate of the field effect transistor, the first terminal of the first control switch is a drain of the field effect transistor, and the second terminal of the first control switch is a source of the field effect transistor.
Optionally, the load is an integrated chip, and the first terminal of the first control switch is electrically connected to a power supply input end of the integrated chip.
Optionally, the load is an integrated chip, and the first terminal of the first control switch is electrically connected to an enable terminal of the integrated chip.
Optionally, the overvoltage protection circuit further includes a third voltage dividing resistor, and the third voltage dividing resistor and the second voltage dividing resistor are connected in series between the output terminal of the voltage signal and the first terminal of the first control switch.
As an optional scheme, the first voltage regulator tube has a first voltage regulation value, when the voltage output by the output end of the voltage signal is less than or equal to the first voltage regulation value, the control end of the first control switch has no trigger voltage, the first terminal of the first control switch and the second terminal of the first control switch are disconnected, the first terminal of the first control switch outputs a high level to the load, and the load operates normally.
As an optional scheme, the first voltage regulator tube has a first voltage regulation value, when the voltage output by the output end of the voltage signal is greater than the first voltage regulation value, the control end of the first control switch generates a trigger voltage, the first terminal of the first control switch and the second terminal of the first control switch are connected, the first terminal of the first control switch outputs a low level to the load, and the load turns off an internal circuit.
Compared with the prior art, the overvoltage protection circuit has the advantages that the voltage stabilizing tube, the control switch and the divider resistor are arranged, so that when the voltage of the power supply output end of the power supply is too high, the divider resistor can output a low level signal to the load, and the load turns off the internal circuit after receiving the low level signal, so that overvoltage protection is realized.
The utility model is described in detail below with reference to the drawings and specific examples, but the utility model is not limited thereto.
Drawings
Fig. 1 is a schematic circuit diagram of an embodiment of the overvoltage protection circuit according to the present invention.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Referring to fig. 1, fig. 1 is a schematic circuit diagram of an embodiment of an overvoltage protection circuit according to the utility model. The overvoltage protection circuit 100 is connected between an output end of a voltage signal and a load, the overvoltage protection circuit 100 comprises a first current limiting resistor R1, a first voltage regulator tube Z1, a first control switch Q1 and a second voltage dividing resistor R2, the first control switch Q1 comprises a control end, a first terminal and a second terminal, the first current limiting resistor R1 and the first voltage regulator tube Z1 are connected between the output end of the voltage signal and the control end of the first control switch Q1 in series, the second voltage dividing resistor R2 is connected between the output end of the voltage signal and the first terminal of the first control switch Q1, the first terminal of the first control switch Q1 is further electrically connected with the load, and the second terminal of the first control switch Q1 is grounded. The anode of the first voltage regulator tube Z1 is electrically connected with the control end of the first control switch Q1, and a first current limiting resistor R1 is connected between the cathode of the first voltage regulator tube Z1 and the output end of the voltage signal. In practical applications, the overvoltage protection circuit 100 may further include a third voltage dividing resistor R3 according to actual requirements, and the third voltage dividing resistor R3 and the second voltage dividing resistor R2 are connected in series between the output terminal of the voltage signal and the first terminal of the first control switch Q1.
In the present invention, the first control switch Q1 is a triode or a field effect transistor, but not limited thereto. When the first control switch Q1 is a transistor, the control terminal of the first control switch Q1 is a base of the transistor, the first terminal of the first control switch Q1 is a collector of the transistor, and the second terminal Q113 of the first control switch Q1 is an emitter of the transistor. When the first control switch Q1 is a fet, the control terminal of the first control switch Q1 is the gate of the fet, the first terminal of the first control switch Q1 is the drain of the fet, and the second terminal of the first control switch Q1 is the source of the fet.
The output end of the voltage signal may be a power supply output end or a voltage detection end, but not limited thereto. When the output end of the voltage signal is the power supply output end of the power supply, the load is, for example, an electronic component which receives the electric energy provided by the power supply output end of the power supply; when the output terminal of the voltage signal is a voltage detection terminal of the electronic device, the load is, for example, a detection circuit. In this embodiment, the load is an integrated chip, and the first terminal of the first control switch Q1 is electrically connected to the power supply connection terminal VCC or the enable terminal EN of the integrated chip. When the first wiring terminal of first control switch Q1 is connected with integrated chip's power incoming end VCC, if integrated chip's power incoming end VCC receives the high level, then integrated chip normal work, if integrated chip's power incoming end VCC receives the low level, then integrated chip is out of work. When the first terminal of the first control switch Q1 is connected to the enable terminal EN of the integrated chip, if the enable terminal EN of the integrated chip receives a high level, the integrated chip operates normally, and if the enable terminal EN of the integrated chip receives a low level, the integrated chip does not operate.
In this embodiment, the first regulator tube Z1 has a first voltage regulation value Vz1, when the voltage output by the output end of the voltage signal is less than or equal to the first voltage regulation value Vz1, the control end of the first control switch Q1 has no trigger voltage, the first terminal of the first control switch Q1 is disconnected from the second terminal of the first control switch Q1, the first terminal of the first control switch Q1 outputs a high level to the load, and the load operates normally; when the voltage output by the output end of the voltage signal is greater than the first regulated voltage value Vz1, the control end of the first control switch Q1 generates a trigger voltage, the first terminal of the first control switch Q1 is connected with the second terminal of the first control switch Q1, the first terminal of the first control switch Q1 outputs a low level to the load, and the load turns off the internal circuit.
In summary, the overvoltage protection circuit of the utility model, by arranging the voltage regulator tube, the control switch and the voltage dividing resistor, when the voltage at the power supply output end of the power supply is too high, the voltage dividing resistor can output a low level signal to the load, and the load turns off the internal circuit after receiving the low level signal, thereby realizing overvoltage protection.
The above detailed description of the preferred embodiments is intended to more clearly illustrate the features and spirit of the present invention, and is not intended to limit the scope of the present invention by the preferred embodiments disclosed above. On the contrary, it is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims. The scope of the utility model is therefore to be accorded the broadest interpretation so as to encompass all such modifications and equivalent arrangements as is within the scope of the appended claims.
Claims (9)
1. An overvoltage protection circuit connected between an output of a voltage signal and a load, the overvoltage protection circuit comprising: the first control switch comprises a control end, a first wiring end and a second wiring end, the first current-limiting resistor and the first voltage-stabilizing tube are connected between the output end of the voltage signal and the control end of the first control switch in series, the second voltage-dividing resistor is connected between the output end of the voltage signal and the first wiring end of the first control switch, the first wiring end of the first control switch is further electrically connected with the load, and the second wiring end of the first control switch is grounded.
2. The overvoltage protection circuit of claim 1, wherein an anode of the first regulator tube is electrically connected to the control terminal of the first control switch, and the first current limiting resistor is connected between a cathode of the first regulator tube and the output terminal of the voltage signal.
3. The overvoltage protection circuit of claim 1, wherein the first control switch is a transistor, the control terminal of the first control switch is a base of the transistor, the first terminal of the first control switch is a collector of the transistor, and the second terminal of the first control switch is an emitter of the transistor.
4. The overvoltage protection circuit of claim 1, wherein the first control switch is a fet, the control terminal of the first control switch is a gate of the fet, the first terminal of the first control switch is a drain of the fet, and the second terminal of the first control switch is a source of the fet.
5. The overvoltage protection circuit of claim 1, wherein the load is an integrated chip, and the first terminal of the first control switch is electrically connected to a power access terminal of the integrated chip.
6. The overvoltage protection circuit of claim 1, wherein the load is an integrated chip, and the first terminal of the first control switch is electrically connected to an enable terminal of the integrated chip.
7. The overvoltage protection circuit of claim 1, further comprising a third voltage divider resistor connected in series with the second voltage divider resistor between the output of the voltage signal and the first terminal of the first control switch.
8. The overvoltage protection circuit of claim 1, wherein the first regulator tube has a first regulated voltage value, when the voltage output from the output terminal of the voltage signal is less than or equal to the first regulated voltage value, the control terminal of the first control switch has no trigger voltage, the first terminal of the first control switch is disconnected from the second terminal of the first control switch, the first terminal of the first control switch outputs a high level to the load, and the load operates normally.
9. The overvoltage protection circuit of claim 1, wherein the first regulator tube has a first regulated voltage value, when the voltage output from the output terminal of the voltage signal is greater than the first regulated voltage value, the control terminal of the first control switch generates a trigger voltage, the first terminal of the first control switch and the second terminal of the first control switch are connected, the first terminal of the first control switch outputs a low level to the load, and the load turns off the internal circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122157229.4U CN215601021U (en) | 2021-09-08 | 2021-09-08 | Overvoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122157229.4U CN215601021U (en) | 2021-09-08 | 2021-09-08 | Overvoltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215601021U true CN215601021U (en) | 2022-01-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122157229.4U Active CN215601021U (en) | 2021-09-08 | 2021-09-08 | Overvoltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215601021U (en) |
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2021
- 2021-09-08 CN CN202122157229.4U patent/CN215601021U/en active Active
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