CN214153996U - Leakage protector with overtemperature protection - Google Patents

Abstract

The utility model discloses an earth-leakage protector of overtemperature prote relates to earth-leakage protector technical field, include: the leakage protection device comprises an action module, a leakage protection control module, a leakage detection module and an overtemperature protection module; the action module is used for disconnecting the power supply; the leakage protection control module is used for controlling the action module to cut off the power supply; the leakage detection module is used for detecting whether the live wire and the zero wire leak electricity or not, when the leakage is detected, the leakage detection module sends out a leakage signal, and the leakage protection control module sends out a power-off signal after receiving the leakage signal; the over-temperature protection module is used for detecting the temperature between the pin and the socket, when the temperature value exceeds a preset value, the over-temperature protection module sends out an over-temperature signal, and the leakage protection control module sends out a power-off signal after receiving the over-temperature signal; compared with the prior art, the action module cuts off the power supply after receiving the power-off signal, and the structure of the over-temperature protection module is optimized, so that the use number of components is reduced, the reliability of a circuit is improved, and the cost is reduced.

Description

Leakage protector with overtemperature protection

Technical Field

The utility model relates to a earth-leakage protector technical field especially relates to an earth-leakage protector of overtemperature prote.

Background

Along with the improvement of living standard, the popularization rate of household water heaters is higher and higher, and the electric shock event of using the water heater is also rare, so that the water heater needs a leakage protector to protect the safety of a user, and the overtemperature protection module in the conventional leakage protector has the problem of complex structure.

The protection plug with the power-off tripping and overvoltage tripping functions, as disclosed in the invention CN106299908A in China, comprises an amplifying circuit, a tripper, a rectifying circuit, a power indicator circuit, a voltage reduction circuit, a silicon controlled rectifier, a zero-sequence current transformer, a ground wire current transformer and a phase-lack protection circuit; although the overtemperature protection module is disclosed, the overtemperature protection module not only needs two amplifiers, but also needs a plurality of resistors, so that the production cost is increased.

SUMMERY OF THE UTILITY MODEL

First, technical problem to be solved

Aiming at the defects in the prior art, the overtemperature module has the problems of complex structure and high production cost.

Second, technical scheme

In order to solve the above problems, an over-temperature protection leakage protector is provided, which comprises: the leakage protection device comprises an action module, a leakage protection control module, a leakage detection module and an overtemperature protection module;

the action module is used for disconnecting the power supply;

the leakage protection control module is used for controlling the action module to cut off the power supply;

the leakage detection module is used for detecting whether the live wire and the zero wire leak electricity or not, when the leakage is detected, the leakage detection module sends out a leakage signal, and the leakage protection control module sends out a power-off signal after receiving the leakage signal;

the over-temperature protection module is used for detecting the temperature between the pin and the socket, when the temperature value exceeds a preset value, the over-temperature protection module sends out an over-temperature signal, and the leakage protection control module sends out a power-off signal after receiving the over-temperature signal;

the action module disconnects the power supply after receiving the power-off signal.

The over-temperature protection module comprises a first resistor, a second resistor, a diode and a thermistor;

the first resistor is electrically connected with the first end of the thermistor;

the first end of the second resistor is electrically connected with the second end of the thermistor and the anode of the diode respectively;

and the cathode of the diode is electrically connected with the leakage protection control module.

Wherein the thermistor is a negative temperature coefficient thermistor.

The leakage protector further comprises an indication module, and the indication module is used for prompting a user whether the leakage protector is connected with a mains supply or not.

Wherein, the indication module is an LED lamp.

The indicating module is a buzzer;

the over-temperature protection module comprises a first resistor, a second resistor, a diode and a thermistor;

the first ends of the first resistor and the second resistor are electrically connected;

the first end of the thermistor is respectively electrically connected with the second end of the second resistor and the anode of the diode;

and the cathode of the diode is electrically connected with the leakage protection control module.

Wherein the thermistor is a positive temperature coefficient thermistor.

Third, beneficial effect

Compared with the prior art, the utility model discloses an optimize overtemperature prote module's structure, reduced the use quantity of components and parts, increased the reliability of circuit, the cost is reduced.

Drawings

Fig. 1 is a schematic circuit diagram of embodiment 1 of the present invention;

fig. 2 is a schematic circuit diagram according to embodiment 2 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.

Example 1:

in this embodiment, will the utility model discloses be applied to on the water heater.

As shown in fig. 1, when the zero-sequence current transformer ZCT1 detects leakage of a zero line or a live line, an induced voltage is respectively input to port 1 and port 2 of the integrated chip U1, when the intensity of the leakage current reaches a preset value, port 5 charges the capacitor C4 in a constant current manner, and when the voltage of the capacitor reaches the preset value, port 7 outputs a high level, that is, the integrated chip U1 sends a power-off signal to trigger the conduction of the silicon controlled rectifier SCR, and the trip coil L1 is energized, so that the switch S1 is turned off;

as shown in fig. 1, the over-temperature protection module includes a resistor R4, a resistor R5, a diode D2, and a thermistor RT;

the resistor R4 is electrically connected with a first end of the thermistor RT, a first end of the resistor R5 is electrically connected with a second end of the thermistor RT and the anode of the diode D2 respectively, and the cathode of the diode D2 is electrically connected with the 6 port of the integrated chip U1;

the resistor R4 and the resistor R5 are used for voltage division;

in the present embodiment, the thermistor RT is a negative temperature coefficient thermistor; when the temperature rises, the resistance of the thermistor RT is reduced, the voltage at two ends of the resistor R5 rises, when the voltage at two ends of the resistor R5 exceeds 1.7V, the diode is conducted, namely an overtemperature signal is sent to the integrated chip U1, after the integrated chip U1 receives the overtemperature signal, a 7 port outputs a high level to trigger the SCR to be conducted, and the tripping coil L1 is electrified, so that the switch S1 is disconnected;

one skilled in the art can adjust the preset temperature value by adjusting the resistance values of the resistor R4 and the resistor R5.

By optimizing the structure of the over-temperature protection module, the use number of components is reduced, the reliability of the circuit is improved, and the cost is reduced.

As shown in fig. 1, the LED1 is an indication module, and when the earth leakage protector is connected to the mains supply, the LED1 lights up to prompt the user that the earth leakage protector is connected to the mains supply.

Through setting up the instruction module, the suggestion user earth-leakage protector has put through the commercial power, has increased earth-leakage protector's safety in utilization.

Example 2:

as shown in fig. 2, in the present embodiment, the thermistor RT is a positive temperature coefficient thermistor; when the temperature rises, the resistance of the thermistor RT rises, the voltage at two ends of the thermistor RT rises, when the voltage at two ends of the thermistor RT exceeds 1.7V, the diode is conducted, namely, an overtemperature signal is sent to the integrated chip U1, after the integrated chip U1 receives the overtemperature signal, the 7 port outputs a high level to trigger the SCR to be conducted, the tripping coil L1 is electrified, and the switch S1 is disconnected

The above embodiments are only used for illustrating the present invention, and not for limiting the present invention, and those skilled in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention, so that all equivalent technical solutions also belong to the scope of the present invention, and the protection scope of the present invention should be defined by the claims.

Claims (8)

1. An over-temperature protected earth-leakage protector, characterized in that it comprises: the leakage protection device comprises an action module, a leakage protection control module, a leakage detection module and an overtemperature protection module;

the action module is used for disconnecting the power supply;

the leakage protection control module is used for controlling the action module to cut off the power supply;

the leakage detection module is used for detecting whether the live wire and the zero wire leak electricity or not, when the leakage is detected, the leakage detection module sends out a leakage signal, and the leakage protection control module sends out a power-off signal after receiving the leakage signal;

the over-temperature protection module is used for detecting the temperature between the plug pin and the socket, when the temperature value exceeds a preset value, the over-temperature protection module sends out an over-temperature signal, and the leakage protection control module sends out a power-off signal after receiving the over-temperature signal;

and the action module disconnects the power supply after receiving the power-off signal.

2. An overtemperature protection earth leakage protector as claimed in claim 1, characterized in that said overtemperature protection module comprises a first resistor (R4), a second resistor (R5), a diode (D2) and a thermistor (RT);

the first resistor (R4) is electrically connected with a first end of the thermistor (RT);

a first end of the second resistor (R5) is electrically connected with a second end of the thermistor (RT) and a positive electrode of a diode (D2) respectively;

the cathode of the diode (D2) is electrically connected with the leakage protection control module.

3. An overtemperature protection earth leakage protector as claimed in claim 2, characterized in that said thermistor (RT) is a negative temperature coefficient thermistor.

4. An over-temperature protected earth-leakage protector as claimed in claim 1, wherein said earth-leakage protector further comprises an indication module for prompting a user whether the earth-leakage protector is connected to the mains.

5. An over-temperature protected earth-leakage protector as claimed in claim 4, wherein said indicating module is an LED lamp.

6. An over-temperature protected earth-leakage protector as claimed in claim 4, wherein said indication module is a buzzer.

7. An overtemperature protection earth leakage protector as claimed in claim 1, characterized in that said overtemperature protection module comprises a first resistor (R4), a second resistor (R5), a diode (D2) and a thermistor (RT);

the first end of the first resistor (R4) and the first end of the second resistor (R5) are electrically connected;

the first end of the thermistor (RT) is respectively and electrically connected with the second end of the second resistor (R5) and the positive electrode of the diode (D2);

the cathode of the diode (D2) is electrically connected with the leakage protection control module.

8. An overtemperature protection earth leakage protector as claimed in claim 7, characterized in that said thermistor (RT) is a positive temperature coefficient thermistor.

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