CN216819368U - Voltage protection device of relay tester - Google Patents
Voltage protection device of relay tester Download PDFInfo
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- CN216819368U CN216819368U CN202123020153.7U CN202123020153U CN216819368U CN 216819368 U CN216819368 U CN 216819368U CN 202123020153 U CN202123020153 U CN 202123020153U CN 216819368 U CN216819368 U CN 216819368U
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Abstract
The utility model discloses a voltage protection device of a relay tester, which comprises a power supply port, a protection switch, a sampling protection circuit, a control module and electric equipment, wherein the power supply port is connected with the protection switch; one end of the protection switch is connected with a power supply port, the other end of the protection switch is connected with the electric equipment, a sampling input end of the sampling protection circuit is connected with the power supply port, a sampling output end of the sampling protection circuit is connected with the control module, and an output end of the control module is connected with a control input end of the protection switch. The utility model can start the power supply at startup or generate abnormal voltage pulse under the influence of external environment to turn off the protection switch, thereby avoiding the impact on equipment, and can automatically close the switch after time delay to recover the normal working state.
Description
Technical Field
The utility model relates to a relay tester, in particular to a voltage protection device of the relay tester.
Background
A relay tester is an important testing tool for ensuring the safe and reliable operation of a power system. The relay tester can not supply power to the equipment in the working process.
In particular, during a test process using a relay protection tester, an impact may be applied to an electric device, the service life of the device may be affected, and even the device may be damaged due to a power source being turned on or an external environment.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art, and provides a voltage protection device of a relay tester, which can be used for starting a power supply at the time of starting or generating abnormal voltage pulse under the influence of an external environment to turn off a protection switch, so that the impact on equipment is avoided, and the protection switch can be automatically closed after time delay to recover a normal working state.
The purpose of the utility model is realized by the following technical scheme: a voltage protection device of a relay tester comprises a power supply port, a protection switch, a sampling protection circuit, a control module and electric equipment;
one end of the protection switch is connected with the power supply port, the other end of the protection switch is connected with the electric equipment, the sampling input end of the sampling protection circuit is connected with the power supply port, the sampling output end of the sampling protection circuit is connected with the control module, and the output end of the control module is connected with the control input end of the protection switch.
Wherein the sampling protection circuit comprises: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a capacitor C and a triode T;
the utility model discloses a power supply device, including first resistance R1, second resistance R2 and triode T, second resistance R2 other end series capacitance C to ground connection, triode T's base links to each other with third resistance R3, second resistance R2 and electric capacity C's common port is connected to third resistance R3's the other end, triode T's collecting electrode links to each other with fourth resistance R4's one end, fourth resistance R4's the other end ground connection.
And the sampling output end of the sampling protection circuit is connected with the collector electrode of the triode T.
Preferably, the control module comprises a microprocessor. And when the output of the sampling output end of the sampling protection circuit is not 0, the microprocessor controls the protection switch to be switched off.
Preferably, the triode is a PNP triode.
The utility model has the beneficial effects that: the utility model can turn off the protection switch when starting the power supply or generating abnormal voltage pulse under the influence of external environment, thereby avoiding the impact on the equipment, and can automatically close the protection switch after time delay to recover normal power supply.
Drawings
FIG. 1 is a functional block diagram of the present invention;
fig. 2 is a schematic diagram of a sampling protection circuit.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
As shown in fig. 1, a voltage protection device of a relay tester includes a power supply port, a protection switch, a sampling protection circuit, a control module, and an electric device;
one end of the protection switch is connected with the power supply port, the other end of the protection switch is connected with the electric equipment, the sampling input end of the sampling protection circuit is connected with the power supply port, the sampling output end of the sampling protection circuit is connected with the control module, and the output end of the control module is connected with the control input end of the protection switch.
As shown in fig. 2, the sampling protection circuit includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a capacitor C and a triode T;
the utility model discloses a power supply device, including first resistance R1, second resistance R2 and triode T, second resistance R2 other end series capacitance C to ground connection, triode T's base links to each other with third resistance R3, second resistance R2 and electric capacity C's common port is connected to third resistance R3's the other end, triode T's collecting electrode links to each other with fourth resistance R4's one end, fourth resistance R4's the other end ground connection.
And the sampling output end of the sampling protection circuit is connected with the collector electrode of the triode T.
In some embodiments of the present application, the control module comprises a microprocessor. And when the output of the sampling output end of the sampling protection circuit is not 0, the microprocessor controls the protection switch to be switched off.
In other embodiments of the present application, the control module may also be composed of a voltage comparator and a reference voltage source, a non-inverting input terminal of the voltage comparator is connected to the reference voltage source, an inverting input terminal of the voltage comparator is connected to a sampling output terminal of the sampling protection circuit, and an output terminal of the voltage comparator is connected to a control input terminal of the protection switch, in this embodiment, the voltage of the reference voltage source is a smaller reference voltage source (e.g., 0.1V), and the protection switch is an MOS switch that is turned on when the control terminal inputs a high level; and a voltage comparator is powered by adopting 12V VCC; when the output of the sampling output end is 0, the in-phase input of the voltage comparator is larger than the reverse-phase input, the output high level controls the protection switch to be switched on, otherwise, when the output voltage of the sampling output end is larger than the voltage of the reference voltage source, the in-phase input of the voltage comparator is smaller than the reverse-phase input, and the output low level controls the protection switch to be switched off.
In an embodiment of the present application, the transistor is a PNP transistor.
When a voltage (generally 24-36V) is input into a power supply port (during starting), the two ends of a capacitor C are at a low level, at the moment, a triode T is conducted, and at the moment, the sampling output end (R4) connected with a collector is not 0; if the control module adopts the microprocessor, the microprocessor controls the protection switch to be cut off, so that impact on the electric equipment is avoided; similarly, if the control module adopts the voltage comparator and the reference voltage source, the setting of the reference voltage source is smaller, so that the sampling output end is definitely larger than the voltage of the reference voltage source, and at the moment, the voltage comparator controls the protection switch to be cut off; that is, no power is supplied to the consumer at this time; thereby avoiding the influence on the electric equipment;
the capacitor C is then charged through the first resistor R1 and the third resistor R3, so that the voltage across the capacitor C gradually rises, and the voltage rise speed across the capacitor C is related to the first resistor R1, the third resistor R3 and the capacitor C; after a certain time delay, when the voltage at the two ends of the capacitor C rises to enable the base voltage of the triode T to reach a certain degree, the emitter of the triode T is reversely biased and cut off, at the moment, the output voltage of the power supply port is gradually stabilized, and the output of the sampling output end is 0; if the control module adopts a microprocessor, the microprocessor controls the protection switch to be conducted, and power supply is started to the electric equipment; similarly, when the control module adopts the voltage comparator and the reference voltage source, the voltage comparator can also output a high level to control the protection switch to be switched on, and the power supply to the electric equipment is started, which is equivalent to providing a buffer during the startup.
Similarly, in the normal working process, if an instantaneous large voltage appears under the influence of an external environment, the triode T is conducted again, at this time, the sampling output end outputs a voltage which is not 0 (and the output voltage under the instantaneous large voltage is larger than the voltage output by the reference voltage source), and the control module controls the protection switch to be cut off again, so that the instantaneous large voltage cannot influence the electric equipment; similarly, the capacitor is charged by the instantaneous large voltage, so that the voltage of the capacitor is gradually increased, after a certain time delay, the triode T emitter is reversely biased and cut off after the power supply starts to be input stably, the output of the sampling output end is 0 at the moment, the control module controls the protection switch to be switched on to recover the normal power supply, the capacitor C is gradually discharged and is balanced with the voltage of the power supply port, and the triode is kept in a cut-off state.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. The utility model provides a voltage protection device of relay tester which characterized in that: the device comprises a power supply port, a protection switch, a sampling protection circuit, a control module and electric equipment;
one end of the protection switch is connected with the power supply port, the other end of the protection switch is connected with the electric equipment, the sampling input end of the sampling protection circuit is connected with the power supply port, the sampling output end of the sampling protection circuit is connected with the control module, and the output end of the control module is connected with the control input end of the protection switch;
the sampling protection circuit includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a capacitor C and a triode T;
the utility model discloses a power supply device, including first resistance R1, second resistance R2 and triode T, second resistance R2 other end series capacitance C to ground connection, triode T's base links to each other with third resistance R3, second resistance R2 and electric capacity C's common port is connected to third resistance R3's the other end, triode T's collecting electrode links to each other with fourth resistance R4's one end, fourth resistance R4's the other end ground connection.
2. The voltage protection device of the relay tester as claimed in claim 1, wherein: and the sampling output end of the sampling protection circuit is connected with the collector electrode of the triode T.
3. The voltage protection device of the relay tester as claimed in claim 1, wherein: the control module includes a microprocessor.
4. The voltage protection device of the relay tester as claimed in claim 3, wherein: and when the output of the sampling output end of the sampling protection circuit is not 0, the microprocessor controls the protection switch to be switched off.
5. The voltage protection device of the relay tester as claimed in claim 1, wherein: the triode T is a PNP triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123020153.7U CN216819368U (en) | 2021-12-03 | 2021-12-03 | Voltage protection device of relay tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123020153.7U CN216819368U (en) | 2021-12-03 | 2021-12-03 | Voltage protection device of relay tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216819368U true CN216819368U (en) | 2022-06-24 |
Family
ID=82051587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123020153.7U Active CN216819368U (en) | 2021-12-03 | 2021-12-03 | Voltage protection device of relay tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216819368U (en) |
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2021
- 2021-12-03 CN CN202123020153.7U patent/CN216819368U/en active Active
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