CN219960101U - Input overvoltage protection control circuit - Google Patents
Input overvoltage protection control circuit Download PDFInfo
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- CN219960101U CN219960101U CN202320615725.6U CN202320615725U CN219960101U CN 219960101 U CN219960101 U CN 219960101U CN 202320615725 U CN202320615725 U CN 202320615725U CN 219960101 U CN219960101 U CN 219960101U
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- 230000005669 field effect Effects 0.000 claims description 17
- 230000000087 stabilizing effect Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model relates to an input overvoltage protection control circuit, in particular to a circuit which adopts the characteristics of a voltage stabilizing diode and the combination control operation of a switch tube. The circuit is simple and has fewer components. The circuit comprises a comparison circuit, a driving circuit and a turn-off circuit. The utility model has the advantages of high response speed, fewer circuit components, simple circuit and ensured reliability.
Description
Technical Field
The utility model relates to the technical field of overvoltage protection circuits, in particular to an input overvoltage protection control circuit.
Background
Overvoltage protection refers to a protection mode in which the power supply is disconnected when the voltage of the protected line exceeds a predetermined maximum value. Overvoltage protection is a power function that cuts off the power supply when the input voltage exceeds a preset value due to internal faults of the power supply or external reasons such as a distribution line, and most of the power supplies use an overvoltage protection circuit to prevent damage to electronic components. The overvoltage protection control circuit is a precondition for using a power protection design circuit.
Many power supply designers have different control modes related to overvoltage protection, and many control circuits are completed by utilizing an optical coupler isolation control circuit.
Disclosure of Invention
The technical problems to be solved are as follows:
in view of the above-mentioned drawbacks and shortcomings of the prior art, the present utility model provides an input overvoltage protection control circuit, which is used for solving the problems of complex structure, slow power protection action and poor reliability of the existing overvoltage protection circuit.
The technical scheme is as follows:
in order to achieve the above purpose, the main technical scheme adopted by the utility model comprises the following steps:
the embodiment of the utility model provides an input overvoltage protection circuit which comprises a comparison circuit, a turn-off circuit and a driving circuit. The comparison circuit is connected in parallel with the voltage input end, and controls the on-off of the circuit by comparing the input voltage of the comparison circuit with the set voltage, so as to provide the voltage for triggering the driving circuit to work. The turn-off circuit is connected in series between the voltage input end and the voltage output end, the turn-on and turn-off of the turn-off circuit is controlled by the drive circuit, and the drive circuit is connected between the comparison circuit and the turn-off circuit.
The comparison circuit includes a resistor R1 and a zener diode D1. The first end of the resistor R1 is connected with the positive electrode of the input voltage, the second end of the resistor R1 is connected with the negative electrode of the zener diode D1, and the positive electrode of the zener diode D1 is connected with the negative electrode of the input voltage and grounded.
The turn-off circuit includes a field effect transistor Q2 and a resistor R3. The source electrode of the field effect transistor MOS-P is connected with the positive electrode of the input voltage, the grid electrode of the field effect transistor Q2 is connected with the first end of the resistor R3, the second end of the resistor R3 is connected with the negative electrode of the input voltage and grounded, and the drain electrode of the field effect transistor Q2 is used as the output end.
The driving circuit comprises a triode Q1 and a resistor R2; the emitter of the triode Q1 is connected with the positive electrode of the input voltage, the source electrode of the field effect transistor Q2 and the first end of the resistor R1, the base electrode of the triode Q1 is connected with the first end of the resistor R2, the second end of the resistor R2 is connected with the negative electrode of the zener diode D1 and the second end of the resistor R1, and the collector electrode of the triode Q1 is connected with the first end of the resistor R3 and the grid electrode of the field effect transistor Q2.
The beneficial effects are that:
the beneficial effects of the utility model are as follows: the utility model relates to an input overvoltage protection control circuit, which comprises three functional modules of a comparison circuit, a driving circuit and a turn-off circuit, wherein components comprise a triode, a voltage stabilizing tube, a field effect tube and three resistors, the circuit structure is not complex, the debugging process is simple, the technology is easy to control, the protection voltage is accurate, the number of components in the circuit is very small, the fault rate is greatly reduced, and the circuit reliability is higher.
Drawings
FIG. 1 is a schematic diagram of an input overvoltage protection control circuit module according to the present utility model;
FIG. 2 is a schematic circuit diagram of an embodiment of the present utility model;
Detailed Description
The utility model will be better explained by the following detailed description of the embodiments with reference to the drawings.
The embodiment of the utility model provides an input overvoltage protection control circuit which comprises a comparison circuit, a turn-off circuit and a driving circuit. The comparison circuit is connected in parallel with the voltage input end, and controls the on-off of the circuit by comparing the input voltage of the comparison circuit with the set voltage, so as to provide the voltage for triggering the driving circuit to work. The turn-off circuit is connected in series between the voltage input end and the voltage output end, the turn-on and turn-off of the turn-off circuit is controlled by the drive circuit, and the drive circuit is connected between the comparison circuit and the turn-off circuit.
In order that the above-described aspects may be better understood, exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.
Examples:
referring to fig. 1, an input overvoltage protection control circuit according to an embodiment of the present utility model includes a comparison circuit, a driving circuit, and a shutdown circuit. The comparison circuit is connected in parallel with the voltage input end, and controls the on-off of the circuit by comparing the input voltage of the input circuit with the set voltage, so as to provide the voltage for triggering the driving circuit to work. The turn-off circuit is connected in series between the voltage input end and the voltage output end, and the turn-on and turn-off of the turn-off circuit is controlled by the driving circuit. The following description will take, as an example, a stable voltage of the zener diode D1 of 5.1V:
referring to fig. 2, the comparison circuit includes a resistor R1 and a zener diode D1. The first end of the resistor R1 is connected with the positive electrode of the input voltage, the second end of the resistor R1 is connected with the negative electrode of the zener diode D1, and the positive electrode of the zener diode D1 is connected with the negative electrode of the input voltage and grounded.
When the input voltage is less than 5.8V, the voltage stabilizing diode is in a cut-off region, the comparison circuit is in an open circuit state, no current flows through the base electrode of the triode Q1, the triode Q1 is not conducted, and the driving circuit does not work. At this time, the voltage between the gate and the source of the field effect transistor Q2 is negative, the field effect transistor Q2 operates normally, and the voltage input to the voltage output terminal of the overvoltage protection control circuit is the same as the voltage input terminal.
When the input voltage is greater than or equal to 5.8V, the voltage breaks down the zener diode D1 through the resistor R1, then the comparison circuit is turned on, the voltage across the zener diode D1 is stabilized at 5.1V, at this time, the voltage vbe=5.1v-5.8v= -0.7V between the emitter and the base of the triode Q1, the triode Q1 is turned on, the driving circuit works, at this time, the voltage between the source and the gate of the field effect transistor Q2 is 0, the field effect transistor is turned off, and the voltage at the voltage output end is 0.
Therefore, when the input voltage is larger than that of the input overvoltage protection circuit provided by the embodiment, the structure is simple, the protection voltage is accurate, and the circuit is reliable.
It should be noted that, the parameters of the zener diode D1 may be set according to the specific protection voltage of the input overvoltage protection, and at this time, R1, R2, R3 and Q2 may be adjusted correspondingly according to the actual input voltage.
In the description of the present utility model, it should be understood that the terms "first end" and "second end" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
In the present utility model, the terms "connected," "coupled," and the like should be construed broadly unless otherwise specifically indicated and defined. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, the term "embodiment" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art within the scope of the utility model.
Claims (1)
1. An input overvoltage protection control circuit, characterized in that: the circuit comprises a comparison circuit, a turn-off circuit and a driving circuit, wherein the comparison circuit is connected in parallel with a voltage input end, the turn-on and turn-off of a circuit is controlled by comparing the input voltage of the comparison circuit with the set voltage, the voltage triggering the operation of the turn-off circuit is provided for the driving circuit, the turn-off circuit is connected in series between the voltage input end and the voltage output end, the turn-off of the turn-off circuit is controlled by the driving circuit, and the driving circuit is connected between the comparison circuit and the turn-off circuit;
the comparison circuit comprises a resistor (R1) and a zener diode (D1); the first end of the resistor (R1) is connected with the positive electrode of the input voltage, the second end of the resistor (R1) is connected with the negative electrode of the zener diode (D1), and the positive electrode of the zener diode (D1) is connected with the negative electrode of the input voltage and grounded;
the turn-off circuit comprises a field effect transistor (Q2) and a resistor R3; the source electrode of the field effect tube (Q2) is connected with the positive electrode of the input voltage, the grid electrode of the field effect tube (Q2) is connected with the first end of the resistor (R3), the second end of the resistor (R3) is connected with the negative electrode of the input voltage and grounded, and the drain electrode of the field effect tube (Q2) is used as an output end;
the driving circuit comprises a triode (Q1) and a resistor R2; the emitter of the triode (Q1) is connected with the positive electrode of the input voltage, the source electrode of the field effect transistor (Q2) and the first end of the resistor (R1), the base electrode of the triode (Q1) is connected with the first end of the resistor (R2), the second end of the resistor (R2) is connected with the negative electrode of the zener diode (D1) and the second end of the resistor (R1), and the collector electrode of the triode (Q1) is connected with the first end of the resistor (R3) and the grid electrode of the field effect transistor (Q2); the triode (Q1) is a PNP triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320615725.6U CN219960101U (en) | 2023-03-27 | 2023-03-27 | Input overvoltage protection control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320615725.6U CN219960101U (en) | 2023-03-27 | 2023-03-27 | Input overvoltage protection control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219960101U true CN219960101U (en) | 2023-11-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320615725.6U Active CN219960101U (en) | 2023-03-27 | 2023-03-27 | Input overvoltage protection control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219960101U (en) |
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2023
- 2023-03-27 CN CN202320615725.6U patent/CN219960101U/en active Active
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