CN210074754U - Double-input leakage protector chip - Google Patents
Double-input leakage protector chip Download PDFInfo
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- CN210074754U CN210074754U CN201920414997.3U CN201920414997U CN210074754U CN 210074754 U CN210074754 U CN 210074754U CN 201920414997 U CN201920414997 U CN 201920414997U CN 210074754 U CN210074754 U CN 210074754U
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Abstract
The utility model discloses a double-input leakage protector chip, which relates to the field of electrical safety and comprises a power supply voltage stabilizing circuit, a voltage reference circuit, an amplifying circuit and an output circuit, wherein the power supply voltage stabilizing circuit is used for providing working voltage; the voltage reference circuit provides reference voltage for the amplifying circuit; the first output end of the amplifying circuit is electrically connected with the first input end of the output circuit, and the second output end of the amplifying circuit is electrically connected with the second input end of the output circuit; when the first input end of the amplifying circuit receives the first leakage signal, the output end of the output circuit outputs a power-off signal; when amplifying circuit's second input received the second leakage signal, output circuit's output outage signal, compares with prior art, the utility model discloses the circuit structure of current dual input leakage protector circuit has been optimized.
Description
Technical Field
The utility model relates to an electrical safety field especially relates to a dual input earth-leakage protector chip.
Background
Along with the improvement of living standard, electrical apparatus in people's house is also more and more, and the security to the domestic power consumption is more and more concerned about, has appeared various earth leakage protector thereupon, because the power consumption environment is more and more abominable, current ground wire abnormal protection has not satisfied conventional control demand, therefore earth leakage protector needs the intelligent direction to develop, and ground wire abnormal protection needs extension detection and intelligent recognition can realize all-round three-dimensional protection.
The leakage monitoring chip of the leakage protector disclosed in the chinese invention patent CN102723695A comprises a power supply voltage stabilizing circuit, a reference voltage generator and a latch output circuit, wherein the power supply voltage stabilizing circuit provides a working voltage for the reference voltage generator and the latch output circuit; the circuit is characterized by also comprising a first amplifying circuit and a second amplifying circuit which have the same circuit structure and performance, wherein one input end of the first differential discharge circuit is electrically connected with one input end of the second differential discharge circuit, and the end serving as a common input end is connected with an external circuit; the other input end of the first differential amplifier circuit is connected with an external circuit, the other input end of the second differential amplifier circuit is connected with the external circuit, and the output end of the first amplifying circuit and the output end of the second amplifying circuit are respectively and electrically connected with the input end of the latch output circuit; the invention adopts two paths of amplifying circuits for realizing double input, and has the problems of complex circuit structure and poor pulse resistance
SUMMERY OF THE UTILITY MODEL
First, technical problem to be solved
How to optimize the circuit structure of the existing double-input leakage protector circuit.
Second, technical scheme
In order to solve the above problems, a dual-input leakage protector chip is provided, which comprises a power voltage stabilizing circuit, a voltage reference circuit, an amplifying circuit and an output circuit, and is characterized in that:
the power supply voltage stabilizing circuit is used for providing working voltage;
the voltage reference circuit provides reference voltage for the amplifying circuit;
the first output end of the amplifying circuit is electrically connected with the first input end of the output circuit, and the second output end of the amplifying circuit is electrically connected with the second input end of the output circuit;
when the first input end of the amplifying circuit receives the first leakage signal, the output end of the output circuit outputs a power-off signal;
when the second input end of the amplifying circuit receives the second leakage signal, the output end of the output circuit outputs a power-off signal.
The output circuit comprises a first latch and a second latch, the input end of the first latch is electrically connected with the first output end of the amplifying circuit, the input end of the second latch is electrically connected with the second output end of the amplifying circuit, and the output end of the first latch is electrically connected with the output end of the second latch.
The double-input leakage protector chip further comprises a protection circuit, and the protection circuit is used for protecting the amplifying circuit.
The protection circuit comprises a first resistor and a first triode, wherein the first end of the first resistor is electrically connected with the base electrode of the first triode, the second end of the first resistor is grounded, and the emitting electrode of the first triode is grounded.
The dual-input leakage protector chip also comprises a first gain regulator and a second gain regulator;
the first output end of the amplifying circuit is electrically connected with the first input end of the output circuit through the first gain regulator;
and the second output end of the amplifying circuit is electrically connected with the second input end of the output circuit through a second gain regulator.
The first output end of the amplifying circuit can be externally connected with a timing capacitor.
The first output end of the amplifying circuit can be externally connected with a timing capacitor.
The beneficial effects of the utility model
Compared with the prior art, the utility model realizes the double-input function through the three-input and two-output amplifying circuit, and reduces one path of amplifying circuit and two resistors compared with the prior art, so that the circuit structure of the chip is simpler, and the difficulty of production and manufacture is reduced;
and the pulse resistance of the chip is improved by a protection circuit consisting of a resistor R1 and a triode Q1.
Drawings
Fig. 1 is a circuit block diagram of the present invention;
fig. 2 is a schematic circuit diagram of the present invention;
fig. 3 is a schematic diagram of an application state of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
As shown in FIG. 1, the power supply voltage stabilizing circuit is used for providing working voltage;
the voltage reference circuit provides a reference voltage for the amplifying circuit U1;
a pin 4 of the amplifying circuit U1 is electrically connected with a first input end of the output circuit through a gain regulator TC1, and a pin 5 of the amplifying circuit U1 is electrically connected with a second input end of the output circuit through a gain regulator TC 2;
the diode D5, the diode D6, the diode D7 and the diode D8 are used for protecting the amplifying circuit U1;
with reference to fig. 2 and fig. 3, the working process of the dual-input leakage protector chip is described in detail, in this embodiment, the first leakage signal is a zero-sequence leakage signal, and the second leakage signal is a ground leakage signal, and a person skilled in the art can set the first leakage signal as the ground leakage signal and the second leakage signal as the zero-sequence leakage signal according to actual requirements;
the chip port 4 is externally connected with a timing capacitor 1, the port 5 is externally connected with a timing capacitor 2, a silicon controlled rectifier SCR is used for controlling a release S1, and a zero sequence current transformer ZCT1 is used for detecting whether the zero line and the live wire leak electricity or not; the ground line transformer ZCT2 is used for detecting whether the ground line leaks electricity.
When the zero-sequence current transformer ZCT1 detects zero line or live wire leakage, the zero-sequence current transformer ZCT1 sends out a zero-sequence leakage signal, after 2 pins of the amplifying circuit U1 receive the signal, the chip port 4 charges the timing capacitor 1 in a constant current mode, when the capacitor voltage reaches a preset value, the first latch is turned over to latch, 6 pins output a power-off signal, namely, a high level is output, the silicon controlled rectifier SCR is triggered to be conducted through the diode D10, the tripping coil L1 is electrified, the tripper S1 is disconnected, and therefore the zero-sequence leakage protection function is achieved.
When the zero sequence current transformer ZCT2 detects ground leakage, the ground current transformer ZCT2 sends a ground leakage signal, after a pin 1 of the amplifying circuit U1 receives the signal, a timing capacitor 2 is charged by a chip port 5 in a constant current mode, when the voltage of the capacitor reaches a preset value, the second latch is turned over and latched, a pin 6 outputs a power-off signal, namely, a high level is output, a diode D10 triggers a Silicon Controlled Rectifier (SCR) to be conducted, a tripping coil L1 is electrified, and a tripper S1 is disconnected, so that the ground leakage protection function is realized.
The protection circuit comprises a resistor R1 and a triode Q1, one end of the resistor R1 is grounded, the other end of the resistor R1 is electrically connected with a base electrode Q1 of the triode Q1, an emitting electrode of the triode Q1 is grounded, and a collector electrode of the triode R4 is electrically connected; the resistor R1 and the triode Q1 are used for resisting pulses and protecting the amplifying circuit U1.
The dual-input function is realized through the three-input two-output amplifying circuit, and compared with the prior art, two resistors are reduced, so that the circuit structure of the chip is simpler, and the difficulty in production and manufacturing is reduced;
and the pulse resistance of the chip is improved by a protection circuit consisting of a resistor R1 and a triode Q1.
The above embodiments are only for illustrating the present invention, and are not intended to limit the present invention, and those skilled in the relevant art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions also belong to the scope of the present invention.
Claims (7)
1. The utility model provides a dual input earth-leakage protector chip, includes power voltage stabilizing circuit, voltage reference circuit, amplifier circuit and output circuit, its characterized in that:
the power supply voltage stabilizing circuit is used for providing working voltage;
the voltage reference circuit provides reference voltage for the amplifying circuit;
a first output end of the amplifying circuit is electrically connected with a first input end of the output circuit, and a second output end of the amplifying circuit is electrically connected with a second input end of the output circuit;
when a first input end of the amplifying circuit receives a first leakage signal, an output end of the output circuit outputs a power-off signal;
when the second input end of the amplifying circuit receives the second leakage signal, the output end of the output circuit outputs a power-off signal.
2. The dual-input leakage protector chip of claim 1, wherein: the output circuit comprises a first latch and a second latch, wherein the input end of the first latch is electrically connected with the first output end of the amplifying circuit, the input end of the second latch is electrically connected with the second output end of the amplifying circuit, and the output end of the first latch is electrically connected with the output end of the second latch.
3. The dual-input leakage protector chip of claim 1, wherein: the double-input leakage protector chip further comprises a protection circuit, and the protection circuit is used for protecting the amplifying circuit.
4. A dual input leakage protector chip as claimed in claim 3, wherein: the protection circuit comprises a first resistor and a first triode, wherein the first end of the first resistor is electrically connected with the base electrode of the first triode, the second end of the first resistor is grounded, and the emitting electrode of the first triode is grounded.
5. The dual-input leakage protector chip of claim 1, wherein: the dual-input leakage protector chip also comprises a first gain regulator and a second gain regulator;
the first output end of the amplifying circuit is electrically connected with the first input end of the output circuit through the first gain regulator;
and the second output end of the amplifying circuit is electrically connected with the second input end of the output circuit through the second gain regulator.
6. The dual-input leakage protector chip of claim 1, wherein: the first output end of the amplifying circuit can be externally connected with a timing capacitor.
7. The dual-input leakage protector chip of claim 1, wherein: the second output end of the amplifying circuit can be externally connected with a timing capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920414997.3U CN210074754U (en) | 2019-03-29 | 2019-03-29 | Double-input leakage protector chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920414997.3U CN210074754U (en) | 2019-03-29 | 2019-03-29 | Double-input leakage protector chip |
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| CN210074754U true CN210074754U (en) | 2020-02-14 |
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| CN201920414997.3U Active CN210074754U (en) | 2019-03-29 | 2019-03-29 | Double-input leakage protector chip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110048369A (en) * | 2019-03-29 | 2019-07-23 | 余姚市嘉荣电子电器有限公司 | A kind of dual input earth leakage protective device chip |
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2019
- 2019-03-29 CN CN201920414997.3U patent/CN210074754U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110048369A (en) * | 2019-03-29 | 2019-07-23 | 余姚市嘉荣电子电器有限公司 | A kind of dual input earth leakage protective device chip |
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