CN2559122Y

CN2559122Y - Surge-proof power socket

Info

Publication number: CN2559122Y
Application number: CN 02271987
Authority: CN
Inventors: 冯焜泉
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-07-18
Filing date: 2002-07-18
Publication date: 2003-07-02
Anticipated expiration: 2012-07-18

Abstract

The utility model relates to an anti-surge power jack, which comprises rabbets arranged on a casing and matched with a plug, a live wire electrode, a null line electrode, and an earth wire electrode arranged in the casing and corresponding to each rabbet, and also a surge protection circuit. The utility model is characterized in that the surge protection circuit comprises a series circuit formed by connecting two piezoresistors in series, the two ends of the piezoresistor series circuit are connected between the live wire electrode and the null line electrode in parallel, and the series connection point of the two piezoresistors are connected to the earth wire electrode. When appearing between any two electrodes, surge current can be absorbed through the piezoresistors, and can also be discharged to the ground through a power earth wire, and thereby the utility model has better protection effect than the prior anti-surge power jack.

Description

Anti-surge supply socket

Technical field

The utility model relates to the electric outlet structure with surge current function, comprises fixed and portable supply socket.

Background technology

Present known supply socket, comprise that fixed supply socket is as dress supply socket on the wall, and portable supply socket such as wiring board etc., its structure all comprises an insulation shell, housing has the jack with the plug coupling, the position corresponding with each jack is respectively equipped with firewire electrode, zero wire electrode and ground line electrode, each homonymy electrode parallel connection in the housing.Live wire, zero line, the ground wire of extraneous power supply are connected to firewire electrode, zero wire electrode and the ground line electrode of socket respectively during use, and the plug of electrical appliance inserts the housing jack and contacts with respective electrode, thereby obtains electric energy.In use, the surge current that produces because of reasons such as the defeated change of thunderbolt, lightning induction, switch motion, electric power, static discharge, ground connection are wrong also can enter electrical appliance by the electrode of socket, and electrical appliance is damaged.For this reason; people improve supply socket; piezo-resistance in parallel between firewire electrode and zero wire electrode; though can effectively absorb the surge current between power firestreak and the zero line like this; but between live wire and the ground wire and the surge current between zero line and the ground wire powerless, the protection effect still bad.

Summary of the invention

The purpose of this utility model provides a kind of anti-surge supply socket of protecting better effects if.

The technical solution of the utility model is: anti-surge supply socket comprises an insulation shell; housing has the jack with the plug coupling; the position corresponding with each jack is respectively equipped with firewire electrode, zero wire electrode and ground line electrode in the housing; each homonymy electrode parallel connection; comprise a surge protection circuit in addition; especially; this surge protection circuit comprises the series circuit that is in series by two piezo-resistances; the two ends of this piezo-resistance series circuit are connected in parallel between firewire electrode and the zero wire electrode, and the serial connection of two piezo-resistances point is connected to the ground line electrode.That is make between firewire electrode and the ground line electrode, and be parallel with piezo-resistance respectively between zero wire electrode and the ground line electrode.When surge current occurring between any two electrodes, all can surge current be sponged, and can discharge surge current over the ground, thereby play the better protection effect by power ground by piezo-resistance.Supply socket described in the utility model not only comprises fixed socket, also comprises mobile jack.

The utility model has the advantages that than existing anti-surge supply socket to have the better protection effect, can protect electrical appliance better, reduce the loss.

Description of drawings

Fig. 1 is a circuit structure schematic diagram of the present utility model;

Fig. 2 is improved protective circuit structure principle chart;

Fig. 3 is again further improved protective circuit structure principle chart;

Fig. 4 is overall structure embodiment of the present utility model.

Embodiment

Referring to Fig. 1, the circuit theory diagrams of the existing supply socket of the outer expression of frame of broken lines wherein have firewire electrode L, zero wire electrode N and ground line electrode E, and each homonymy electrode parallel connection comprises existing supply socket K switch, circuit breaker MCB commonly used in addition.It in the frame of broken lines the distinctive surge protection circuit of the utility model; this circuit comprises the series circuit that is in series by two piezo-resistance MOV1, MOV2; the two ends of this piezo-resistance series circuit are connected in parallel between firewire electrode L and the zero wire electrode N, and the serial connection point of two piezo-resistances is connected to ground line electrode E.Piezo-resistance MOV1, MOV2 can adopt Z181 type metal piezo-resistance.When surge current occurring between firewire electrode L and the zero wire electrode N, piezo-resistance MOV1 and MOV2 sponge surge current, and can discharge surge current over the ground by power ground; When surge current occurring between firewire electrode L and the ground line electrode E, piezo-resistance MOV1 sponges surge current; When surge current occurring between zero wire electrode N and the ground line electrode E, piezo-resistance MOV2 sponges surge current.

For improving fail safe of the present utility model, embodiment shown in Figure 2 is in series with discharge tube GDT between the serial connection point of two piezo-resistance MOV1, MOV2 and ground line electrode E.Discharge tube GDT is open-circuit condition for supply voltage, avoided ground line electrode E former thereby danger that connect with live wire or zero line because of piezo-resistance damage, resistance reduction etc.; And for surge voltage, discharge tube GDT is low resistive state, and surge current can pass through discharge tube GDT smoothly, and is unaffected fully.

As further improvement, can increase piezo-resistance defencive function and operating state deixis.As shown in Figure 3, protective tube F1 can connect between firewire electrode L and connected piezo-resistance MOV1, protective tube F2 also connects between zero wire electrode N and connected piezo-resistance MOV2, but also be provided with a bridge circuit, first brachium pontis of bridge circuit is made of the protective tube F1 that is connected with firewire electrode and resistance R 6 series connection, second brachium pontis on the other side is made of the protective tube F2 that is connected with zero wire electrode and resistance R 1 series connection, the 3rd brachium pontis is connected with firewire electrode, constitute by connecting with a resistance R 5 again after a light-emitting diode GLED and resistance R 4 parallel connection, the 4th brachium pontis on the other side is made of a resistance R 2 that is connected to zero wire electrode, diagonal a at electric bridge, at least be connected with a sounding or light-emitting component between the b to make the usefulness of warning, present embodiment is connected with buzzer Y and light-emitting diode RLED simultaneously, and light-emitting diode RLED also is in series with current-limiting resistance R3.Bridge circuit to the product of arm resistance about equally, make the voltage at described electric bridge diagonal a, b two ends be lower than the operating voltage that is connected the element on this diagonal.The operation principle of present embodiment is such: 1. under the normal condition, because electric bridge to the product of arm resistance about equally, that is when live wire for just, zero line is when negative, R6 * R1 ≈ (R5+R4) * R2, when live wire is timing for negative, zero line, R6 * R1 ≈ R5 * R2, therefore the voltage difference of 2 of a, b is very little, buzzer Y and light-emitting diode RLED all do not work, but have half-wave current to flow through light-emitting diode GLED this moment, and the luminous indication circuit of light-emitting diode GLED is in normal operating conditions; 2. when surge current occurred, surge current flow through piezo-resistance MOV1, MOV2 smoothly by protective tube F1, F2, and this moment, the other parts of circuit were unaffected; 3. very big and when exceeding the energy range that piezo-resistance MOV1, MOV2 bear when surge current; protective tube F1 and F2 while or one of them are blown prior to piezo-resistance; play the effect of protection piezo-resistance; on the other hand; as long as protective tube F1 and F2 are blown any one; electric bridge just destroyed to arm resistance product relation about equally, the voltage difference at a, b two ends raise also is enough to drive buzzer Y and light-emitting diode RLED work, thereby carries out sound, light is reported to the police.

For the voltage difference that prevents electric bridge diagonal two ends is higher than the sounding that is connected on this diagonal, the voltage that light-emitting component can bear, also can between the electric bridge diagonal, connect the pressure limiting element.As shown in Figure 3, be connected with a two-way admittance diode D as the pressure limiting element at electric bridge diagonal a, b two ends, two voltage stabilizing didoes that also can adopt reverse parallel connection in addition are as the pressure limiting element.When the voltage difference at electric bridge diagonal a, b two ends is higher than the breakover voltage of two-way admittance diode D; two-way admittance diode D conducting; with the voltage clamp at electric bridge diagonal a, b two ends near its breakover voltage, thereby play the effect of protection buzzer Y and light-emitting diode RLED.

Because what insert between firewire electrode and the zero wire electrode is alternating current, therefore in above-mentioned each circuit diagram, surge protection circuit is connected to the tie point of firewire electrode and zero wire electrode and can exchanges, that is the line of c point connecting to neutral line, d point can being started to exchange fire.The polar orientation of this UV light-emitting diode GLED and RLED also can be turned.

Overall structure as the best; can as shown in Figure 4 whole surge protection circuit be placed on one independently in the box body 1; be fixed with conductive base pin 2 on the box body; on the housing 3 of supply socket, be provided with cavity 3a with box body 1 coupling; have the conduction corresponding in the cavity and interrupt 4 with the box body pin; box body 1 embeds in the housing cavity 3a; and conductive base pin 2 inserts conduction and interrupts 4, surge protection circuit by box body conductive base pin 2 and the conduction in the cavity interrupt 4 with housing 3 in firewire electrode, zero wire electrode and line electrode be communicated with.For ease of carrying out sound, light warning, also can on box body 1, offer entrant sound and loophole.The advantage of this structure is that maintenance, replacing surge protection circuit are very convenient; as long as extracting box body 1 in the cavity 3a of power shell just can pull down whole surge protection circuit; and supply socket still can be used as not the common power socket of anti-surge electric current and uses the only need of can meet an urgent need fully.

Claims

1. anti-surge supply socket; comprise an insulation shell; housing has the jack with the plug coupling; the position corresponding with each jack is respectively equipped with firewire electrode, zero wire electrode and ground line electrode in the housing; each homonymy electrode parallel connection; comprise a surge protection circuit in addition; it is characterized in that: described surge protection circuit comprises the series circuit that is in series by two piezo-resistances; the two ends of this piezo-resistance series circuit are connected in parallel between firewire electrode and the zero wire electrode, and the serial connection of two piezo-resistances point is connected to the ground line electrode.

2. supply socket as claimed in claim 1 is characterized in that being in series with discharge tube between the serial connection point of two piezo-resistances and ground line electrode.

3. supply socket as claimed in claim 1 or 2, it is characterized in that: between firewire electrode and connected piezo-resistance, be in series with protective tube, between zero wire electrode and connected piezo-resistance, also be in series with protective tube, be provided with a bridge circuit in addition, first brachium pontis of bridge circuit is made of the protective tube that is connected with firewire electrode and a resistance series connection, second brachium pontis on the other side is made of the protective tube that is connected with zero wire electrode and a resistance series connection, the 3rd brachium pontis is connected with firewire electrode, constitute by connecting with a resistance again after a light-emitting diode and the resistance parallel connection, the 4th brachium pontis on the other side is made of a resistance that is connected to zero wire electrode, between a diagonal of electric bridge, be connected with a sounding or light-emitting component at least, bridge circuit to the product of arm resistance about equally.

4. supply socket as claimed in claim 3 is characterized in that also being connected with the pressure limiting element between the described electric bridge diagonal.

5. supply socket as claimed in claim 3; it is characterized in that: whole surge protection circuit is placed on one independently in the box body; be fixed with conductive base pin on the box body; on the housing of supply socket, be provided with cavity with the box body coupling; having the conduction corresponding with the box body pin in the cavity interrupts; box body embeds in the housing cavity; and conductive base pin inserts conduction and interrupts, and conductive base pin and conduction cavity in of surge protection circuit by box body interrupted and be communicated with firewire electrode, zero wire electrode and ground line electrode in the housing.