CN2876795Y

CN2876795Y - Improved leak electricity detecting circuit

Info

Publication number: CN2876795Y
Application number: CN 200620008016
Authority: CN
Inventors: 李成力; 岳国兰
Original assignee: Shanghai ELE Manufacturing Corp
Current assignee: Shanghai ELE Manufacturing Corp
Priority date: 2006-03-15
Filing date: 2006-03-15
Publication date: 2007-03-07
Anticipated expiration: 2016-03-15

Abstract

The utility model discloses an improved leak electricity detecting circuit which comprises a controllable silicon, a coil with built-in iron core, a switch interlocked with a power plug/socket reset button, a rectifier bridge and a resistor. The control electrode of the controllable silicon is connected through the switch and the resistor with the shielding layer of the power lead at the power output end of the power plug/socket, and the anode and the cathode of the rectifier bridge are connected with the anode and the cathode at the DC power output end of the rectifier bridge after being connected with the coil in series; the AC power input end of the rectifier bridge is connected with the live wire and the mid-wire at the power input end of the power plug/socket. When press down the reset button, the switch connected with the control electrode of the controllable silicon closes; in case of occurrence of leak electricity in the power output wire, the controllable silicon is triggered conductive; a current flows through the coil connected in series with the controllable silicon to generate a magnetic field, and the built-in iron core acts to result in a trip of the reset button, thus cutting off the electric connection between the power input end and the power output end of the power plug/socket and then powering off the power-consuming equipment.

Description

The modified electric-leakage detection circuit

Technical field

The utility model relates to and a kind ofly is installed in attaching plug/supply socket, is used for the electric-leakage detection circuit whether test plug/socket power output terminal live wire or zero line exist leaky.

Background technology

Universal day by day along with household electrical appliance, the safe in utilization of household electrical appliance is subject to people's attention day by day.In order to guarantee the safe in utilization of household electrical appliance, avoid because the household electrical appliance electric leakage causes personal injury, at present, be provided with electric-leakage detection circuit in some attaching plug/socket, be used to detect attaching plug/socket power output terminal live wire or zero line and whether have leaky.

Fig. 1 is the common electric-leakage detection circuit physical circuit figure that is installed in the attaching plug.As shown in the figure, this electric-leakage detection circuit mainly is made of optocoupler IC, controllable silicon SCR, the coil SOL that is built-in with iron core, diode D5, D6 and resistance R, R1, R2.The input end 1 of optocoupler IC links to each other with the screen layer L of attaching plug/socket power output end power line by resistance R 2, and the input end 2 of optocoupler IC passes through diode D5, D6 and links to each other with live wire HOT, zero line WHITE in attaching plug/socket power output end power line respectively; The output terminal 6 of optocoupler IC links to each other with the gate pole of controllable silicon SCR, and the output terminal 4 of optocoupler IC links to each other with the anode of controllable silicon SCR; Simultaneously, be connected in parallel between the live wire HOT and zero line WHITE of attaching plug/socket power output terminal after being welded on coil SOL that whether made attaching plug/socket power output terminal on attaching plug/socket circuit plate have electric power output and controllable silicon SCR being connected.

When there are leaky in the live wire in the attaching plug that links to each other with household electrical appliance LOAD/socket power output end power line or zero line, when being live wire HOT in attaching plug/socket power output line or zero line WHITE electric leakage, screen layer L is charged, screen layer L then, resistance R 2, optocoupler IC input end light emitting diode, diode D5 or D6 and power firestreak HOT or zero line WHITE form current return, make optocoupler IC conducting, the conducting of optocoupler IC output terminal triode, trigger the controllable silicon SCR conducting, there is electric current to flow through among the coil SOL, produce magnetic field, make the iron core action that is built among the coil SOL, make the reset button RESET tripping operation that is connected in the power supply current supply circuit, the power supply output of the plug of cutting off the electricity supply.

Electric-leakage detection circuit shown in Figure 1 is whether to have leaky by live wire or zero line that optocoupler IC detects in attaching plug/socket power output line, if there is leaky, optocoupler IC conducting, its output terminal conducting, the controllable silicon SCR conducting that triggering links to each other with coil SOL on being welded on attaching plug/socket internal circuit board, making in the coil SOL has electric current to flow through, produce magnetic field, make the iron core action that is built in the coil, action by iron core, make reset button RESET tripping operation, the plug of cutting off the electricity supply power input is connected with the electric power of output terminal, cuts off the power supply of consumer.

Summary of the invention

The purpose of this utility model provides that a kind of circuit structure is simpler, work is more reliable, can be widely used in supply socket/plug, be used to detect the modified electric-leakage detection circuit whether power output end live wire or zero line exist leaky.

For achieving the above object, the utility model is by the following technical solutions: a kind of modified electric-leakage detection circuit it by controllable silicon, be built-in with iron core coil, constitute with switch, rectifier bridge, the resistance of attaching plug/socket reset button interlock;

The silicon controlled control utmost point links to each other with the screen layer of attaching plug/socket power output end power line by described switch, resistance, and silicon controlled anode, negative electrode link to each other with positive pole, the negative pole of rectifier bridge dc power output end with coil series connection back; The ac power input end of rectifier bridge links to each other with the attaching plug/live wire of socket power input end, zero line.

The invention also discloses a kind of modified electric-leakage detection circuit, it by controllable silicon, be built-in with iron core coil, constitute with switch, rectifier bridge, the resistance of attaching plug/socket reset button interlock;

The silicon controlled control utmost point links to each other by the screen layer of resistance with attaching plug/socket power output end power line, and silicon controlled anode, negative electrode link to each other with positive pole, the negative pole of rectifier bridge dc power output end with coil series connection back; The ac power input end of rectifier bridge links to each other with the live wire or the zero line of attaching plug/socket power input end by described switch.

The key distinction of the utility model and traditional electric-leakage detection circuit is: the utility model has omitted the optocoupler of control controllable silicon SCR conducting in traditional electric-leakage detection circuit, with controlling the conducting of controllable silicon SCR with the switch of reset button interlock, simplified circuit structure, make electric-leakage detection circuit simpler, it is more reliable to work.

The utility model has the advantages that: circuit structure is simple, and reliable operation can detect leak current fault exactly.

Description of drawings

Fig. 1 is existing electric-leakage detection circuit physical circuit figure

Fig. 2 is the utility model electric-leakage detection circuit physical circuit figure

Fig. 3 is the another physical circuit figure of the utility model electric-leakage detection circuit

Embodiment

As shown in Figure 2, the disclosed electric-leakage detection circuit of the utility model mainly by controllable silicon SCR, be built-in with iron core coil SOL, constitute with switch S 1, rectifier bridge D1～D4, resistance R 2～R4, capacitor C 2, the C3 of attaching plug/socket reset button RESET interlock.

The control utmost point of controllable silicon SCR links to each other with the screen layer L of attaching plug/socket power output end power line by switch S 1, resistance R 4, and the anode of controllable silicon SCR, negative electrode link to each other with the diode rectifier bridge D1～positive pole of D4 dc power output end, negative pole with coil SOL series connection back; Diode rectifier bridge D1～D4 ac power input end links to each other with live wire HOT, the zero line WHITE of attaching plug/socket power input end LINE.

Principle of work of the present utility model is: press reset button RESET, be connected on switch S and switch S 1 closure that extremely links to each other with controllable silicon SCR control in attaching plug/socket current supply circuit; When there are leaky in the live wire HOT in the power supply output line of attaching plug/socket power output terminal or zero line WHITE, because switch S 1 is closed, so, the controllable silicon SCR conducting that is triggered; There is electric current to flow through in the coil SOL that connects with controllable silicon SCR, coil SOL produces magnetic field, be built in iron core action wherein, make reset button RESET tripping operation, switch S and S1 disconnect, the plug of cutting off the electricity supply power input LINE is connected with the electric power of output terminal LOAD, cuts off the power supply of consumer.

When there are not leaky in the live wire in attaching plug/socket power output line or zero line, not conducting of controllable silicon SCR, there is not electric current to flow through among the coil SOL, coil SOL does not produce magnetic field, the iron core that is built in wherein is failure to actuate, and the switch S, the S1 that link with reset button RESET still are in closure state, attaching plug/socket operate as normal, electric power output is arranged, the consumer operate as normal.

Duty for the display power supply plug, as shown in Figure 2, the utility model also is provided with display circuit, this display circuit is made of resistance R 1, LED and diode D5 series connection, and this display circuit is connected in parallel between attaching plug/socket power output end power live wire HOT, zero line WHITE.

In order to simulate leaky, whether detect the utility model work normal, as shown in Figure 2, the utility model also is provided with simulation test switch TEST, the end of this simulation test switch TEST links to each other with live wire HOT in attaching plug/socket power output end power line, and the other end links to each other with the screen layer L of attaching plug/socket power output end power line.Push simulation test switch TEST, make its closure, live wire HOT in the power supply output line directly is communicated with, simulates the live wire leaky with screen layer L, the conducting that is triggered of controllable silicon SCR in the electric-leakage detection circuit, there is electric current to flow through in the coil SOL that connects with SCR, produce magnetic field, make built-in iron core action wherein, action by iron core, make reset button RESET tripping operation, disconnect with the switch S and the S1 of reset button RESET interlock, the plug of cutting off the electricity supply power input is connected with the electric power of output terminal, cuts off the power supply of consumer.

As shown in Figure 2, the utility model also is parallel with resistance R 3 and capacitor C 2 between the control utmost point of controllable silicon SCR and negative electrode.Between the anode of controllable silicon SCR and negative electrode, be parallel with the resistance R 2 and the capacitor C 3 of connecting.Wherein, resistance R 3 be used for making the controllable silicon SCR control utmost point trigger voltage in range of safety operation, capacitor C 3 prevents the controllable silicon false triggering.

Fig. 3 is another physical circuit figure of the utility model electric-leakage detection circuit.It is with the difference of electric-leakage detection circuit shown in Figure 2: the control of controllable silicon SCR extremely directly the shielding by resistance R 4 and attaching plug/socket power output end power line once L link to each other; And the switch S 1 of reset button RESET interlock is connected between diode rectifier bridge D1～D4 ac power input end and the attaching plug/socket power input end LINE live wire HOT.

Press reset button RESET, be connected in attaching plug/socket current supply circuit switch S with switch S 1 closure that diode rectifier bridge D1～the D4 ac power input end links to each other; When having leaky between the live wire HOT in attaching plug/socket power output end power line or zero line WHITE and shielding line L, the controllable silicon SCR conducting that is triggered; There is electric current to flow through in the coil SOL that connects with controllable silicon SCR, coil SOL produces magnetic field, be built in iron core action wherein, make reset button RESET tripping operation, switch S and S1 disconnect, the plug of cutting off the electricity supply power input LINE is connected with the electric power of output terminal LOAD, cuts off the power supply of consumer.

When there are not leaky in the live wire in attaching plug/socket power output end power line or zero line, not conducting of controllable silicon SCR, there is not electric current to flow through among the coil SOL, coil SOL does not produce magnetic field, the iron core that is built in wherein is failure to actuate, and the switch S, the S1 that link with reset button RESET still are in closure state, attaching plug/socket operate as normal, electric power output is arranged, the consumer operate as normal.

The utility model has the advantages that: circuit structure is simpler, and it is more reliable to work, and can detect leak current fault exactly.

The above is the design concept and the physical circuit figure of the utility model electric-leakage detection circuit, and is any based on the equivalent transformation on the technical solutions of the utility model basis, all belongs within the utility model protection domain.

Claims

1, a kind of modified electric-leakage detection circuit is characterized in that: it by controllable silicon (SCR), be built-in with the coil (SOL) of iron core, (D1～D4), resistance (R4) constitute for switch (S1), rectifier bridge with the interlock of attaching plug/socket reset button RESET;

The control utmost point of controllable silicon (SCR) links to each other with the screen layer (L) of attaching plug/socket power output end power line by described switch (S1), resistance (R4), and (D1～D4) positive pole, the negative pole of dc power output end link to each other with rectifier bridge with coil (SOL) series connection back for the anode of controllable silicon (SCR), negative electrode; (D1～ac power input end D4) links to each other with live wire (HOT), the zero line (WHITE) of attaching plug/socket power input end (LINE) rectifier bridge.

2, a kind of modified electric-leakage detection circuit according to claim 1 is characterized in that: be parallel with resistance (R3) and an electric capacity (C2) between the control utmost point of described controllable silicon (SCR) and negative electrode;

Between the anode of described controllable silicon (SCR) and negative electrode, also be parallel with resistance of connecting (R2) and electric capacity (C3).

3, a kind of modified electric-leakage detection circuit according to claim 1 and 2, it is characterized in that: this electric-leakage detection circuit also includes a display circuit, this display circuit is made of resistance (R1), light emitting diode (LED) and diode (D5) series connection, and this display circuit is connected in parallel between attaching plug/socket power output end power live wire (HOT), the zero line (WHITE).

4, a kind of modified electric-leakage detection circuit according to claim 3, it is characterized in that: this electric-leakage detection circuit also includes a simulation test switch (TEST), one end of this simulation test switch (TEST) links to each other with live wire (HOT) in attaching plug/socket power output end power line, and the other end links to each other with the screen layer (L) of attaching plug/socket power output end power line.

5, a kind of modified electric-leakage detection circuit is characterized in that: it by controlled (SCR), be built-in with the coil (SOL) of iron core, (D1～D4), resistance (R4) constitute for switch (S1), rectifier bridge with the interlock of attaching plug/socket reset button RESET;

The control utmost point of controllable silicon (SCR) links to each other with the screen layer (L) of attaching plug/socket power output end power line by resistance (R4), and (D1～D4) positive pole, the negative pole of dc power output end link to each other with rectifier bridge with coil (SOL) series connection back for the anode of controllable silicon (SCR), negative electrode; (ac power input end of D1～D4) links to each other with the live wire (HOT) or the zero line (WHITE) of attaching plug/socket power input end (LINE) by described switch (S1) rectifier bridge.

6, a kind of modified electric-leakage detection circuit according to claim 5 is characterized in that: be parallel with resistance (R3) and an electric capacity (C2) between the control utmost point of described controllable silicon (SCR) and negative electrode;

7, according to claim 5 or 6 described a kind of modified electric-leakage detection circuits, it is characterized in that: this electric-leakage detection circuit also includes a display circuit, this display circuit is made of resistance (R1), light emitting diode (LED) and diode (D5) series connection, and this display circuit is connected in parallel between attaching plug/socket power output end power live wire (HOT), the zero line (WHITE).

8, a kind of modified electric-leakage detection circuit according to claim 7, it is characterized in that: this electric-leakage detection circuit also includes a simulation test switch (TEST), one end of this simulation test switch (TEST) links to each other with live wire (HOT) in attaching plug/socket power output end power line, and the other end links to each other with the screen layer (L) of attaching plug/socket power output end power line.