CN213906284U

CN213906284U - Multifunctional control circuit for controlling disconnection type leakage protector

Info

Publication number: CN213906284U
Application number: CN202022811506.4U
Authority: CN
Inventors: 倪圣富
Original assignee: Zhejiang Chengfu Electric Appliance Technology Co ltd
Current assignee: Zhejiang Chengfu Electric Appliance Technology Co ltd
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2021-08-06
Anticipated expiration: 2030-11-23

Abstract

The utility model discloses a many function control disconnection type earth-leakage protector control circuit, including high temperature protection circuit, low temperature protection circuit, overvoltage crowbar, external control open circuit, electric leakage chip U1, mutual-inductor ZCT 1. This many function control disconnection type earth-leakage protector control circuit, through high temperature protection circuit, low temperature protection circuit, overvoltage crowbar, multiple control protection circuits such as external control break circuit detect the voltage, when detecting voltage anomaly, electric leakage chip U1 control foot A point reaches when the partial pressure ratio exceeds 1V, the B point output high voltage drive silicon controlled rectifier SCR1 work of electric leakage chip U1, trip coil L1 gains the electricity, earth-leakage protector tripping operation outage, thereby multiple function control's demand has been realized, high temperature protection has simultaneously, low temperature protection, the function of overvoltage protection and external control disconnection.

Description

Multifunctional control circuit for controlling disconnection type leakage protector

Technical Field

The utility model relates to a earth-leakage protector technical field specifically is disconnected type earth-leakage protector control circuit of multi-functional control.

Background

The leakage protector, called leakage breaker for short, is mainly used for protecting the person with fatal danger from electric shock when the equipment has leakage fault, has the functions of overload and short circuit protection, can be used for protecting the overload and short circuit of a circuit or a motor, and can also be used for the infrequent switching and starting of the circuit under normal conditions. When the existing control circuit of the disconnected leakage protector is used, the function is single, multiple detection protection cannot be carried out on circuit voltage, and when the voltage is in a problem, the disconnected leakage protector cannot be powered off in time, so that a great number of hidden dangers are caused. Therefore, a multifunctional control disconnection type leakage protector control circuit is provided.

SUMMERY OF THE UTILITY MODEL

The not enough to prior art, the utility model provides a many function control disconnection type earth-leakage protector control circuit has solved the problem that proposes in the above-mentioned background art.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the multifunctional control disconnection type leakage protector control circuit comprises a high-temperature protection circuit, a low-temperature protection circuit, an overvoltage protection circuit, an external control disconnection circuit, a leakage chip U1 and a transformer ZCT1, wherein the high-temperature protection circuit consists of a thermistor NTC1, a series circuit R8, R7 and D3, the low-temperature protection circuit consists of a thermistor NTC1, a series circuit R9, a thermistor NTC2 and a D4, the overvoltage protection circuit consists of a sampling circuit R10, R11 and D2, the external control disconnection circuit consists of J1, an optocoupler U2, C1 and R3, the high-temperature protection circuit, the low-temperature protection circuit, the overvoltage protection circuit and the external control disconnection circuit are respectively electrically connected with a point on the leakage chip U1, a point B on the leakage chip U1 is electrically connected with a silicon controlled rectifier 1, and the silicon controlled rectifier 1 is electrically connected with a tripping coil L1.

Optionally, the working point of the high-temperature protection circuit is greater than 55 ℃.

Optionally, the working point of the low-temperature protection circuit is less than 3 ℃.

Optionally, the external input end of the optocoupler U2 is controlled by a voltage of 5V or more, and the control current is between 0.5mA and 20 mA.

Optionally, the R3 is electrically connected to the point a on the leakage chip U1 after being serially connected to the optocoupler U2.

Optionally, the divided voltage of the R8, the thermistor NTC1 and the R7 is isolated by the D3 and then electrically connected to the point a on the leakage chip U1.

Optionally, the divided voltage of the R9 and the NTC2 is isolated by the D4 and then electrically connected to the point a on the leakage chip U1.

Optionally, the divided voltage of the R10 and the R11 is isolated by the D2 and then electrically connected to the point a on the leaky chip U1.

Optionally, the transformer ZCT1 is electrically connected to the leakage chip U1.

The utility model provides a many function control disconnection type earth-leakage protector control circuit possesses following beneficial effect:

1. the multifunctional control disconnection type leakage protector control circuit detects voltage through various control protection circuits such as a high-temperature protection circuit, a low-temperature protection circuit, an overvoltage protection circuit and an external control disconnection circuit, when the voltage is detected to be abnormal, when a point A of a control pin of a leakage chip U1 reaches a voltage division ratio exceeding 1V, a point B of the leakage chip U1 outputs high voltage to drive a Silicon Controlled Rectifier (SCR) 1 to work, a trip coil L1 obtains electricity, and the leakage protector trips and is powered off, so that the multifunctional control circuit has the functions of high-temperature protection, low-temperature protection, overvoltage protection and external control disconnection, and can also be independently used in a single function; and the multifunctional control is realized by using the least elements, the volume is reduced, the cost is reduced, and meanwhile, when the partial pressure ratio of the point A is more than 1V, the point B can realize the control output characteristic to realize other control functions except the control, such as gas-sensitive detection protection and humidity detection protection.

2. This many function control disconnection type earth-leakage protector control circuit utilizes opto-coupler U2 to keep apart through external control disconnection circuit and can connect outside MCU and realize more functions, like expansion control such as temperature control disconnection, remote control disconnection, RF disconnection, infrared control disconnection, WIFI control disconnection, has improved this many function control disconnection type earth-leakage protector control circuit's suitability.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic view of a partial structure of the present invention.

In the figure: 1. a high temperature protection circuit; 2. a low temperature protection circuit; 3. an overvoltage protection circuit; 4. an external control disconnect circuit; 5. a leakage chip U1; 6. a trip coil L1; 7. transformer ZCT 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1 to 2, the present invention provides a technical solution: a multifunctional control disconnection type leakage protector control circuit comprises a high-temperature protection circuit 1, a low-temperature protection circuit 2, an overvoltage protection circuit 3, an external control disconnection circuit 4, a leakage chip U15 and a mutual inductor ZCT17, wherein the high-temperature protection circuit 1 comprises a thermistor NTC1, a series circuit R8, R7 and D3, the low-temperature protection circuit 2 comprises a thermistor NTC1, a series circuit R9, a thermistor NTC2 and a D4, the overvoltage protection circuit 3 comprises a sampling circuit R10, R11 and D2, the external control disconnection circuit 4 comprises a J1, an optical coupler U2, a C1 and a R3, the high-temperature protection circuit 1, the low-temperature protection circuit 2, the overvoltage protection circuit 3 and the external control disconnection circuit 4 are respectively electrically connected with a point on the leakage chip U15, a B point on the leakage chip U15 is electrically connected with a thyristor 1, and the thyristor 1 is electrically connected with a tripping coil L16.

Wherein, the working point of the high-temperature protection circuit 1 is more than 55 ℃.

Wherein, the working point of the low-temperature protection circuit 2 is less than 3 ℃.

Wherein, the external input end of the optical coupler U2 is controlled by voltage of 5V or above, and the control current is between 0.5mA and 20 mA.

The R3 is electrically connected with the point A on the leakage chip U15 after being connected with the optocoupler U2 in series. When the external J1 is controlled to have current between 0.5mA and 20mA and voltage larger than 5V, the optocoupler U2 is switched on, the voltage at the end of the C1 is transmitted to the point A of the leakage chip U15 through the R3 and the U2, and when the voltage at the point A of the leakage chip U15 is larger than 1V, the point B of the leakage chip U15 outputs high voltage to drive the SCR1 to be switched on, and the trip coil L16 is electrified to realize external on-off control.

The R8, the thermistor NTC1 and the R7 are electrically connected with the point A on the leakage chip U15 after being isolated by the D3. When the power-on working state is realized, the resistance value of the thermistor NTC1 is greatly reduced at 55 ℃, the divided voltage of the series loop R8, the thermistor NTC1 and the resistor R7 is isolated and transmitted to the point A of the leakage chip U15 through the D3, and when the voltage of the point A of the leakage chip U15 is more than 1V, the point B of the leakage chip U15 outputs high voltage to drive the silicon controlled rectifier SCR1 to be conducted, and the tripping coil L1 obtains electricity, so that high-temperature tripping protection is realized.

The divided voltage of the R9 and the thermistor NTC2 is isolated by the D4 and then electrically connected with the point A on the leakage chip U15. When the power is on, the resistance of the thermistor NTC1 is greatly increased when the temperature is below 3 ℃, the partial voltage of the series loop R9 and the thermistor NTC2 is isolated by the D4 and is transmitted to the point A of the leakage chip U15, when the voltage of the point A of the leakage chip U15 is larger than 1V, the point B of the leakage chip U15 outputs high voltage to drive the SCR1 to be conducted, the tripping coil L16 obtains electricity, and low-temperature tripping protection is realized.

The partial voltage of R10 and R11 is isolated by D2 and then electrically connected with the point A on the leaky chip U15. When the voltage of the point A of the leakage chip U15 is larger than 1V, the point B of the leakage chip U15 outputs high voltage to drive the SCR1 to be conducted, and the tripping coil L16 obtains electricity to realize overvoltage tripping protection.

The mutual inductor ZCT17 is electrically connected with the leakage chip U15. When the zero-sequence leakage current passes through the transformer ZCT17 in a working state, after the leakage chip U15 is amplified and locked, high voltage is output from a point B of the leakage chip U15 to drive the silicon controlled rectifier SCR1 to be conducted, the trip coil L16 obtains power, and the leakage protector trips to cut off the power.

In summary, when the multifunctional control disconnection type leakage protector control circuit is used and in a working state, when zero-sequence leakage current passes through the mutual inductor ZCT17, after the leakage chip U15 is amplified and locked, high voltage is output from a point B of the leakage chip U15 to drive the silicon controlled rectifier SCR1 to be conducted, the trip coil L16 is powered on, and the leakage protector is tripped and powered off; when the voltage of the point A of the leakage chip U15 is larger than 1V, the point B of the leakage chip U15 outputs high voltage to drive the SCR1 to be conducted, and the tripping coil L16 obtains electricity to realize overvoltage tripping protection; when the temperature is below 3 ℃, the resistance value of the thermistor NTC1 is greatly increased, the divided voltage of the series loop R9 and the thermistor NTC2 is isolated by the D4 and is transmitted to the point A of the leakage chip U15, when the voltage of the point A of the leakage chip U15 is more than 1V, the point B of the leakage chip U15 outputs high voltage to drive the silicon controlled rectifier SCR1 to be conducted, the trip coil L16 is electrified, and low-temperature trip protection is realized; at 55 ℃, the resistance value of the thermistor NTC1 is greatly reduced, the divided voltage of the series loop R8, the thermistor NTC1 and the resistor R7 is isolated and transmitted to the point A of the leakage chip U15 through the D3, when the voltage of the point A of the leakage chip U15 is more than 1V, the point B of the leakage chip U15 outputs high voltage to drive the SCR1 to be conducted, the tripping coil L1 is electrified, and high-temperature tripping protection is realized; when the external J1 control current is between 0.5mA and 20mA and the voltage is larger than 5V, the optocoupler U2 is conducted, the voltage at the C1 end is sent to the point A of the leakage chip U15 through the R3 and the U2, and when the voltage at the point A of the leakage chip U15 is larger than 1V, the point B of the leakage chip U15 outputs high voltage to drive the silicon controlled rectifier SCR1 to be conducted, the trip coil L16 is electrified, and external on-off control is achieved.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, and the part should be covered within the protection scope of the present invention.

Claims

1. Many function control disconnection type earth-leakage protector control circuit, including high temperature protection circuit (1), low temperature protection circuit (2), overvoltage protection circuit (3), external control open circuit (4), electric leakage chip U1(5), mutual-inductor ZCT1(7), its characterized in that: the high-temperature protection circuit (1) is composed of a thermistor NTC1, a series circuit R8, R7 and D3, the low-temperature protection circuit (2) is composed of a thermistor NTC1, a series circuit R9, a thermistor NTC2 and a thermistor D4, the overvoltage protection circuit (3) is composed of a sampling circuit R10, a sampling circuit R11 and a sampling circuit D2, the external control disconnection circuit (4) is composed of a J1, an optocoupler U2, a resistor C1 and a resistor R3, the high-temperature protection circuit (1), the low-temperature protection circuit (2), the overvoltage protection circuit (3) and the external control disconnection circuit (4) are respectively and electrically connected with a point A on a leakage chip U1(5), a point B on the leakage chip U1(5) is electrically connected with a silicon controlled rectifier SCR1, and the silicon controlled rectifier 1 is electrically connected with a trip coil L1 (6).

2. The multifunctional control disconnection type earth leakage protector control circuit of claim 1, wherein: the working point of the high-temperature protection circuit (1) is greater than 55 ℃.

3. The multifunctional control disconnection type earth leakage protector control circuit of claim 1, wherein: the working point of the low-temperature protection circuit (2) is less than 3 ℃.

4. The multifunctional control disconnection type earth leakage protector control circuit of claim 1, wherein: the external input end of the optical coupler U2 is controlled by voltage of 5V or above, and the current is controlled between 0.5mA and 20 mA.

5. The multifunctional control disconnection type earth leakage protector control circuit of claim 1, wherein: the R3 is electrically connected with the point A on the electric leakage chip U1(5) after being connected with the optocoupler U2 in series.

6. The multifunctional control disconnection type earth leakage protector control circuit of claim 1, wherein: the partial voltage of the R8, the thermistor NTC1 and the R7 is isolated by the D3 and then electrically connected with the point A on the leakage chip U1 (5).

7. The multifunctional control disconnection type earth leakage protector control circuit of claim 1, wherein: the partial voltage of the R9 and the thermistor NTC2 is isolated by D4 and then electrically connected with a point A on the leakage chip U1 (5).

8. The multifunctional control disconnection type earth leakage protector control circuit of claim 1, wherein: the partial voltage of the R10 and the R11 is electrically connected with the point A on the leakage chip U1(5) after being isolated by the D2.

9. The multifunctional control disconnection type earth leakage protector control circuit of claim 1, wherein: the transformer ZCT1(7) is electrically connected with the leakage chip U1 (5).