CN203690888U

CN203690888U - Electric leakage protection plug

Info

Publication number: CN203690888U
Application number: CN201420072810.3U
Authority: CN
Inventors: 钱加灿
Original assignee: Yuyao Jiarong Electronic Appliance Co Ltd
Current assignee: Yuyao Jiarong Electronic Appliance Co Ltd
Priority date: 2014-02-20
Filing date: 2014-02-20
Publication date: 2014-07-02
Anticipated expiration: 2024-02-20

Abstract

The utility model discloses an electric leakage protection plug. The plug comprises a rectification circuit, a power supply voltage reduction circuit, a power indication lamp, an electrical apparatus release, a first IC amplification circuit, a silicon controlled rectifier, a zero sequence mutual inductor and a test circuit. An over-temperature protection module and a first reverse isolation circuit connected to the over-temperature protection module are arranged between the first IC amplification circuit and the silicon controlled rectifier. The over-temperature protection module comprises a shunting reference source, a thermistor, a triode, a first voltage dividing resistor, a second voltage dividing resistor and a biasing resistor. A collecting electrode of the triode is connected to the first reverse isolation circuit and a control electrode of the silicon controlled rectifier. The first voltage dividing resistor, the second voltage dividing resistor and the thermistor are connected in series. A reference end of the shunting reference source is connected to the thermistor. A cathode of the shunting reference source is connected to a base electrode of the triode and the biasing resistor. An anode of the shunting reference source is connected to a cathode of the silicon controlled rectifier and the second voltage dividing resistor. The plug of the utility model uses a characteristic of the shunting reference source and controlled precision of the over-temperature electric leakage protection plug is increased.

Description

Leakage protecting plug

Technical field

The utility model relates to electric security protector device field, particularly a kind of leakage protecting plug.

Background technology

Before the utility model people, disclosed a kind of leakage protecting plug with overtemperature prote is obtained good result in actual production with in using; but also expose the accurate not defect of temperature control; because the variation of ambient temperature; affect the parameter of electronic component, thereby can not accurately control trip temperature.

Utility model content

(1) technical problem that will solve

The purpose of this utility model will overcome above-mentioned shortcoming exactly, aims to provide a kind of leakage protecting plug.

(2) technical scheme

For addressing the above problem, the utility model proposes a kind of leakage protecting plug, comprise rectification circuit, power supply reduction voltage circuit, power supply indicator, release, an IC amplifying circuit, controllable silicon, zero-sequence transformer and hookup, the first reverse isolation circuit that is also provided with overtemperature prote module and is connected with overtemperature prote module between an IC amplifying circuit and controllable silicon; Overtemperature prote module comprises shunt reference source, thermistor, triode, the first divider resistance, the second divider resistance and biasing resistor; The collector electrode of triode connects the first reverse isolation circuit and the silicon controlled control utmost point; The first divider resistance, the second divider resistance are connected with thermistor, the reference edge of shunt reference source is connected with thermistor, negative electrode connecting triode base stage and the biasing resistor of shunt reference source, the anodic bonding silicon controlled negative electrode of shunt reference source and the second divider resistance.

Further, the reference edge of shunt reference source and anode shunt capacitance.

Further, be also provided with the 2nd IC amplifying circuit and the change-over circuit with its electrical connection, the output of the 2nd IC amplifying circuit connects the second reverse isolation circuit.

Further, change-over circuit comprises the second zero-sequence transformer and the 3rd zero-sequence transformer, and second zero-sequence transformer one end is connected with the 3rd zero-sequence transformer one end, and the second zero-sequence transformer other end is connected by change over switch with the other end of the 3rd zero-sequence transformer.

Further, the primary coil of the second zero-sequence transformer connects ground wire and zero line, and the ground wire large resistance current limliting dropping resistor of connecting.

Further, between zero line and ground wire, be provided with induced voltage and eliminate electric capacity and ground wire electrification indication.

Further, after thermistor is heated, resistance declines, and the reference voltage terminal of shunt reference source rises to preset value, and shunt reference source cathode potential declines, and makes triode conducting.

Further, shunt reference source is preferably TL431.

(3) beneficial effect

Compared with prior art, the utlity model has following advantage: utilize the characteristic of shunt reference source, improved the controlled precision of overtemperature leakage protecting plug.

Accompanying drawing explanation

Fig. 1 is the module map of the embodiment mono-of leakage protecting plug of the present utility model;

Fig. 2 is the circuit theory diagrams of the embodiment mono-of leakage protecting plug of the present utility model;

Fig. 3 is the module map of the embodiment bis-of leakage protecting plug of the present utility model;

Fig. 4 is the circuit theory diagrams of the embodiment bis-of leakage protecting plug of the present utility model;

Fig. 5 is the circuit theory diagrams of the employing semistor of embodiment mono-of the present utility model;

Fig. 6 is the circuit theory diagrams of the employing semistor of embodiment bis-of the present utility model.

Embodiment

Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples are used for illustrating the utility model, but are not used for limiting scope of the present utility model.

Embodiment mono-

As depicted in figs. 1 and 2, leakage protecting plug of the present utility model, comprise rectification circuit, power supply reduction voltage circuit, power supply indicator, release, the one IC amplifying circuit, controllable silicon SCR, the first zero-sequence transformer and hookup, wherein rectification circuit is made up of diode D1, power supply indicator is made up of LED lamp series resistance R4～R6, the one IC amplifying circuit comprises detection of electrical leakage special chip U1, resistance R 11, resistance R 12, the first reverse isolation circuit is diode D2, hookup comprises the button K of series connection, resistance R 7～R9 composition, power supply reduction voltage circuit is made up of the resistance R 18～R23 that mixes connection, the the first reverse isolation circuit that is also provided with overtemperature prote module and is connected with overtemperature prote module between an IC amplifying circuit and controllable silicon, overtemperature prote module comprises shunt reference source U2, thermistor RT, triode Q1, the first divider resistance R15, the second divider resistance R14 and biasing resistor R24, the collector electrode of triode Q1 connects the control utmost point of the first reverse isolation circuit and controllable silicon SCR, the first divider resistance R15, the second divider resistance R14 connect with thermistor RT, the reference edge of shunt reference source U2 is connected with thermistor RT, negative electrode K connecting triode Q1 base stage and the biasing resistor R24 of shunt reference source U2, the anode A of shunt reference source U2 connects controllable silicon SCR negative electrode and the second divider resistance R14.

The reference edge of shunt reference source U2 and anode A anti-interference capacitor C10 in parallel.

Shunt reference source U2 in the present embodiment is preferably TL431, TL431 is an accurate adjustable reference power circuit, having good stabilized voltage characteristic and voltage stabilizing value flexibly sets, output voltage is set up an office can be at Vref(reference voltage) to adjustable continuously between 40V, this circuit is at the alternative voltage stabilizing didoe in many application scenarios.

The circuit theory diagrams of the present embodiment are referring to Fig. 2.

Operation principle of the present utility model is as follows: as shown in Figure 2, thermistor RT is connected the reference edge of shunt reference source U2 with the common port of the second divider resistance R14, after the thermistor RT of employing negative temperature coefficient is heated, resistance declines, (RT+R15) ratio of/R14 declines, thereby make the voltage Vref of reference edge increase, in the present embodiment, reference voltage terminal is preset as 2.5V, when Vref reaches preset value, shunt reference source U2 negative electrode K current potential declines, make triode Q1 conducting, triode Q1 collector electrode has electric current to flow through, and be connected with the control utmost point of controllable silicon SCR by triode Q1 collector electrode, thereby make controllable silicon SCR conducting, release starts action, deenergization.Same, as shown in Figure 5, when adopting the thermistor RT of true temperature coefficient, thermistor RT is connected the reference edge of shunt reference source U2 with the common port of the first divider resistance R15, after thermistor RT is heated, resistance rises, R15/(R14+RT) ratio declines, thereby make the voltage Vref of reference edge increase, when Vref reaches preset value, shunt reference source U2 negative electrode K current potential declines, make triode Q1 conducting, triode Q1 collector electrode has electric current to flow through, and be connected with the control utmost point of controllable silicon SCR by triode Q1 collector electrode, thereby make controllable silicon SCR conducting, release starts action, deenergization.

Embodiment bis-

The present embodiment is identical with the basic structure of embodiment mono-, and difference is:

As shown in Figure 3 and Figure 4, be also provided with the 2nd IC amplifying circuit and the change-over circuit with its electrical connection, the output of the 2nd IC amplifying circuit connects the second reverse isolation circuit D2.The 2nd IC amplifying circuit comprises the second detection of electrical leakage special chip U3 and attached components and parts thereof.

Change-over circuit comprises the second zero-sequence transformer ZCT2 and the 3rd zero-sequence transformer ZCT3, second zero-sequence transformer ZCT2 one end is connected with the 3rd zero-sequence transformer ZCT3 one end, and the other end of the second zero-sequence transformer ZCT2 other end and the 3rd zero-sequence transformer ZCT3 is connected by change over switch K.The second zero-sequence transformer ZCT2 is for detection of the electric leakage situation between zero line and ground wire, and the 3rd zero-sequence transformer ZCT3 is for detection of ground wire electrification situation.

The primary coil of the second zero-sequence transformer ZCT2 connects ground wire E and zero line N, and the ground wire E large resistance current limliting dropping resistor R3 that connects.

The ground wire electrification that is provided with induced voltage elimination capacitor C 1 between zero line N and ground wire E and be made up of resistance R 1 and neon bulb X1 is indicated.

The circuit theory diagrams of the present embodiment are referring to Fig. 4 (adopting the thermistor of negative temperature coefficient), and Fig. 6 is the circuit theory diagrams that adopt the thermistor of positive temperature coefficient.The operation principle of the present embodiment is identical with the operation principle of embodiment mono-.

The mentioned circuit element symbol of the present embodiment only illustrates effectively the relevant accompanying drawing of the present embodiment.

Below be only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.

Claims

1. a leakage protecting plug, comprise rectification circuit, power supply reduction voltage circuit, power supply indicator, release, an IC amplifying circuit, controllable silicon, zero-sequence transformer and hookup, it is characterized in that: the first reverse isolation circuit that is also provided with overtemperature prote module and is connected with overtemperature prote module between an IC amplifying circuit and controllable silicon; Overtemperature prote module comprises shunt reference source, thermistor, triode, the first divider resistance, the second divider resistance and biasing resistor; The collector electrode of triode connects the first reverse isolation circuit and the silicon controlled control utmost point; The first divider resistance, the second divider resistance are connected with thermistor, the reference edge of shunt reference source is connected with described thermistor, negative electrode connecting triode base stage and the biasing resistor of shunt reference source, the anodic bonding silicon controlled negative electrode of shunt reference source and the second divider resistance.

2. leakage protecting plug according to claim 1, is characterized in that: the reference edge of shunt reference source and anode shunt capacitance.

3. leakage protecting plug according to claim 2, is characterized in that: be also provided with the 2nd IC amplifying circuit and the change-over circuit with its electrical connection, the output of the 2nd IC amplifying circuit connects the second reverse isolation circuit.

4. leakage protecting plug according to claim 3; it is characterized in that: change-over circuit comprises the second zero-sequence transformer and the 3rd zero-sequence transformer; second zero-sequence transformer one end is connected with the 3rd zero-sequence transformer one end, and the second zero-sequence transformer other end is connected by change over switch with the other end of the 3rd zero-sequence transformer.

5. leakage protecting plug according to claim 4, is characterized in that: the primary coil of the second zero-sequence transformer connects ground wire and zero line, and the ground wire large resistance current limliting dropping resistor of connecting.

6. leakage protecting plug according to claim 5, is characterized in that: between zero line and ground wire, be provided with induced voltage and eliminate electric capacity and ground wire electrification indication.

7. according to leakage protecting plug described in claim 2 to 6 any one, it is characterized in that: after thermistor is heated, resistance declines, and the reference voltage terminal of shunt reference source rises to preset value, shunt reference source cathode potential declines, and makes triode conducting.

8. leakage protecting plug according to claim 7, is characterized in that: shunt reference source is preferably TL431.