CN2852454Y

CN2852454Y - End-to-life display circuit of earth leakage protective socket

Info

Publication number: CN2852454Y
Application number: CN 200520127817
Authority: CN
Inventors: 黄华道
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-11-02
Filing date: 2005-11-02
Publication date: 2006-12-27
Anticipated expiration: 2015-11-02

Abstract

The utility model discloses an end-to-life display circuit of a leakage protection socket, which is composed of a red luminescent diode, two thyristors and resistors, wherein the red luminescent diode is connected with a fire wire and a zero line at the power input end of the leakage protection socket after connected in series to the thyristors and the resistors, and trigger electrodes of the thyristors are connected with a fire wire at the power output end of the leakage protection socket after connected in series to the resistors and a simulation test button of the leakage protection socket. When a built-in component of the leakage protection socket is under the condition of malfunction which means the leakage protection socket is disabled, a user presses the simulation test button, and the red luminescent diode in the end-to-life display circuit can continuously emit light to notify the user that the leakage protection socket does not have the function of leakage protection already and advise the user to cut off the socket power input and change a new leakage protection socket in time. The utility model has the advantages of simple structure, clear indication, favorable performance and high safety, and more importantly, the utility model can effectively reduce the accidental occurrence of death by electric shock.

Description

The current leakage jack life termination display circuit

Technical field

The utility model relates to a kind of indicator light display circuit, in especially a kind of retaining socket (GFCI) that is applied to leak electricity, be used to show the indicator light display circuit that current leakage jack life termination can't operate as normal.

Background technology

Along with popularizing of household electrical appliance, when household electrical appliance offered convenience to people, its fail safe is paid more and more attention also.Therefore; various earth leakage protective sockets are born thereupon; yet meanwhile; fault or end-of-life have occurred if the problem of another worth people's deep thinking is exactly an earth leakage protective socket itself, can't play a protective role, and the user has not known fully; in this case; earth leakage protective socket not only can not play a protective role, and, also can cause damage to user's person and property.Therefore; safe condition for earth leakage protective socket itself also should be informed the user with a kind of mode; when earth leakage protective socket itself breaks down or end-of-life when losing protective effect; in time inform the user; cause user's attention; the earth leakage protective socket that replacing has in time been broken down prevents the dead accident of electric shock that causes owing to the earth leakage protective socket inefficacy and the thing of burning electrical equipment taken place.

Yet at present, the earth leakage protective socket of selling on the market does not have the end-of-life display circuit.When the element in the earth leakage protective socket breaks down or after its end-of-life loses protective effect; the user does not know; still push its reset button, it is resetted and energized, in this case; in case occur leak current fault in the circuit; this earth leakage protective socket does not only have protective effect, can't trip, the output of cutting off the electricity supply; and, also very easily cause the generation of user's electric shock accidents and thing that power consumption equipment is burnt to take place.

Summary of the invention

In view of the foregoing, the purpose of this utility model provides a kind of indicator light display circuit in the earth leakage protective socket, expression jack life termination state that is applied to.This indicator light display circuit can inform clearly whether this earth leakage protective socket work of user is normal; promptly when element fault or jack life termination in this earth leakage protective socket can't operate as normal; this display circuit can be told the user clearly, reminds the user in time to change this socket.

For achieving the above object, the utility model by the following technical solutions: a kind of current leakage jack life termination display circuit is characterized in that: it is made up of red light emitting diodes, controllable silicon, resistance; Red light emitting diodes links to each other with earth leakage protective socket power input live wire, zero line with controllable silicon, resistance series connection back, and the silicon controlled trigger electrode links to each other with the live wire of earth leakage protective socket power output end with the analogue test button series connection back of resistance, earth leakage protective socket.

Between described silicon controlled trigger electrode and negative electrode, be parallel with diode, voltage stabilizing didoe, electric capacity and resistance.

Because the utility model adopts above design; when the earth leakage protective socket inner member break down be the earth leakage protective socket disabler after; the user presses the analogue test button; light-emitting diode in the end-of-life display circuit can continue luminous; inform that this earth leakage protective socket of user has lost creepage protection function, should cut off the earth leakage protective socket that the socket power input in time more renews.The utility model is simple in structure, indicates clearly, and performance is good, and is safe and reliable, the more important thing is, the utility model can reduce the generation of the dead accident of getting an electric shock effectively.

Description of drawings

Fig. 1 is existing earth leakage protective socket internal control circuit physical circuit figure

Fig. 2 is the annexation figure of the utility model end-of-life display circuit and internal control circuit

Embodiment

Fig. 1 is existing earth leakage protective socket (GFCI) internal control circuit figure.As shown in the figure, it mainly with 200: 1 magnetic test coil, the coil SOL that be built-in with iron core, controllable silicon SCR 1, the chip IC that be used to trigger controllable silicon SCR 1 conducting (model RV4145), reset button RESET, analogue test button TEST and some resistance, electric capacity, the diode that with magnetic test coil link to each other forms by being used to detect two of leakage current at 1000: 1.

After earth leakage protective socket correctly inserts power supply, press reset button RESET, the three-phase socket of socket output LOAD and receptacle face is charged, and electric power output is arranged.Because power firestreak HOT and zero line WHITE passed magnetic test coil 1000: 1 and 200: 1 simultaneously, when the current phasor in two circuits that pass magnetic test coil with when non-vanishing, be when having leakage current in the circuit, magnetic test coil can induce a voltage signal, voltage signal is input to signal input part 1 pin and 7 pin of IC, 5 pin of IC output control signals to the trigger electrode of controllable silicon SCR 1, make controllable silicon SCR 1 conducting, thereby make coil SOL get electric generation magnetic field, its inner iron core action, drive the element action of socket inside, make reset button RESET escape, cut off the power supply output of socket.When whether just often detecting the earth leakage protective socket function; can press test switch TEST, produce a simulation leakage current, after magnetic test coil detects this phenomenon; make chip IC output one control voltage signal; make controllable silicon SCR 1 conducting, coil SOL gets electric generation magnetic field, its inner iron core action; drive the element action of socket inside; make reset button RESET escape, cut off the power supply output of socket, illustrate that this earth leakage protective socket function is intact.

When the work of earth leakage protective socket inner member all just often, intact earth leakage protective socket can be realized protective effect, guarantees the safety of electrical equipment.But; when the earth leakage protective socket inner member breaks down or because component ageing end-of-life can't operate as normal the time; when occurring short circuit, leak current fault again in the circuit; control circuit in the above-mentioned earth leakage protective socket can't make reset button RESET escape; cut off the power supply output of socket; and the user does not know this situation, continue to use, and that will certainly give user's personal safety and electric equipment safe in utilizationly has harm.

In order to reflect intuitively whether earth leakage protective socket work is normal; promptly break down and can't can remind the user to change socket in time during operate as normal when current leakage jack life termination or inner member, the utility model have increased a current leakage jack life termination indicator light display circuit in control circuit.As shown in Figure 2, this display circuit is made up of red light emitting diodes RED-LED, controllable silicon SCR 2, resistance R 8～R12, diode D5～D8, capacitor C 8.Red light emitting diodes RED-LED links to each other with earth leakage protective socket power input live wire HOT, zero line WHITE with controllable silicon SCR 2, resistance R 11, R12 series connection back, and the trigger electrode of controllable silicon SCR 2 links to each other with the live wire of earth leakage protective socket power output end with the analogue test button TEST series connection back of resistance R 8, R10, diode D5, earth leakage protective socket.Between the trigger electrode of controllable silicon SCR 2 and negative electrode, be parallel with diode D6, D8, capacitor C 8, resistance R 9.

When whether just often detecting earth leakage protective socket work, can press simulation test button TEST earlier, make socket output live wire HOT and input zero line WHITE short circuit produce a simulation leakage current by force, trigger controllable silicon SCR 2 conductings, make red light emitting diodes RED-LED luminous; Output one voltage signal was given input 1 pin and 7 pin of chip IC after magnetic test coil detected leakage current; the control signal output ends 5 pin output one control voltage of chip IC; trigger controllable silicon SCR 1 conducting; make reset button RESET tripping operation by the element in the socket; the output of cut-out socket power; the trigger voltage of controllable silicon SCR 2 is zero; when the input power supply is negative half period; controllable silicon SCR 2 is turn-offed; when input voltage is positive half cycle; because the trigger voltage of SCR2 is zero, SCR2 is conducting more not, and red light emitting diodes RED-LED extinguishes; so; if red light emitting diodes RED-LED extinguishes, illustrate that this earth leakage protective socket function is intact, the user can relievedly use.If the earth leakage protective socket inner member has broken down or current leakage jack life termination can't operate as normal the time; assembly in the earth leakage protective socket can't make reset button RESET escape; cut off the power supply output of socket; then the trigger electrode of controllable silicon SCR 2 can have trigger voltage to exist all the time; controllable silicon SCR 2 conducting all the time; red light emitting diodes RED-LED continues luminous; so; if red light emitting diodes RED-LED does not extinguish lasting luminous; illustrate that this earth leakage protective socket inner member breaks down; can't operate as normal; can't make reset button RESET escape; cut off the power supply output of socket, the user should in time change socket, in order to avoid cause the dead accident of unexpected electric shock.

The utility model is simple in structure, indicates clearly, and performance is good, and is safe and reliable, the more important thing is, the utility model can reduce the generation of the dead accident of getting an electric shock effectively.

The above only is a specific embodiment of the utility model, and protection range of the present utility model is not limited thereto, and anyly all belongs within the utility model protection range based on the equivalent transformation on the utility model circuit.

Claims

1, a kind of current leakage jack life termination display circuit, it is characterized in that: it is made up of red light emitting diodes, controllable silicon, resistance; Red light emitting diodes links to each other with earth leakage protective socket power input live wire, zero line with controllable silicon, resistance series connection back, and the silicon controlled trigger electrode links to each other with the live wire of earth leakage protective socket power output end with the analogue test button series connection back of resistance, earth leakage protective socket.

2, current leakage jack life termination display circuit according to claim 1 is characterized in that: be parallel with diode, voltage stabilizing didoe, electric capacity and resistance between described silicon controlled trigger electrode and negative electrode.