CN1384575A - Comprehensive leakage protection socket combination - Google Patents

Abstract

The comprehensive leakage protecting socket combination is used to prevent electric shock and fire caused by missing earthing line, leakage, etc. effectively. By means of microelectronic technology, various functions are integrated into one small compact structure and the protection socket combination has electromagnetic switch. The present invention has compact structure, small volume, low cost and very low power consumption. The protection socket combination as one "soft wire conversion" type protector is suitable for used in movable electric appliances.

Description

Comprehensive leakage protection socket combination

The present invention relates to a kind of supply socket row who controlled electrical device is owed comprehensive electricity evil defencive functions such as wiring and electric leakage, overcurrent, short circuit, overtemperature who adopts microelectronic circuit control.

The present invention breaks through the earth leakage protective device of world's prior art to fail to make controlled electrical equipment to make the effectively technological deficiency of protection when owing to connect wires.

But supply socket volitional check of the present invention is owed to be connected to the electrical equipment energising of imitating ground wire and is enabled, and has comprehensive electricity evil defencive function such as electric leakage concurrently, thereby reaches electric noxa elements such as fundamentally eliminating person electric shock, electrical fire, and this is a technological revolution to safety utilization of electric power.

The present invention owes earth connection integrated protection plugs and sockets series (1. comprehensive leakage protection plug-socket; 2. comprehensive leakage protection socket combination; 3. comprehensive leakage protection plug; 4. comprehensive leakage protection socket is 5. owed the making sheet of earth leakage integrated protection) in second.

The present invention series and the inventor " the startup switch with electric damage protection before " of invention not long ago (Chinese patent patent application number: 00117423.1) and with " the comprehensive leakage protection switch " of the present invention's patent application simultaneously be to have the earth connection of owing defencive function equally; the present invention's series is with the former two's difference: last " startup switch with electric damage protection before " is to adopt full automatic electromagnetic switch control; and there is more comprehensive electricity to do harm to defencive function; but its cost is slightly high; and in use need certain self power consumption, its is fit to device higher; use in the bigger electrical equipment of power.One of back, the electricity evil defencive function of " owe earth connection leak electricity comprehensive electric protective circuit breaker " is few slightly, but it is to adopt the control of electromagnetic trip switch, and its cost is lower, and self power consumption is very little in use, is fit to widespread device and uses in general electrical equipment.The common ground of above binomial invention all must be installed configuration by electric appliances plant when making electrical equipment; Like this, they being promoted the use of all sidedly just need one section long process.This just is difficult to use in compatible existing a large amount of electrical equipment.

Series of the present invention; be that the electric leakage integrated protection function of will owing to connect wires is loaded in attaching plug, the socket; this just can simple and direct flexibly method; be configured in voluntarily in those electrical equipment that do not assemble the comprehensive leakage protection function by the user and use, to obtain same safe and reliable can fundamentally eliminating the person gets an electric shock and electricity evil protection effects such as electrical fire.

Electrical equipment (particularly metal shell) is owed to be connected to and is imitated ground wire and use, and is easy to cause personal electric shock injures and deaths, electrical fire.Therefore say that making the electrical appliance earth connection is the indispensable primary measure of safety utilization of electric power.

In order to prevent that the person from getting an electric shock and electrical fire, begins the electric leakage protection technology (earth leakage protective device, earth leakage circuit-breaker) that developed country just endeavours to study electrical equipment as far back as last century two, the '30s.But the global up to now various earth leakage protective devices that generally adopt are all being deposited the technological deficiency that can not prevent personal electric shock injures and deaths when controlled electrical equipment owes to be connected to the effect ground wire.

Just can be when it takes place to puncture electric leakage trigger earth leakage protective device and produce power-off protection because the existing various earth leakage protective devices that generally adopt in the whole world all utilize controlled electric appliance casing to connect effective ground wire by the ground wire leakage current of releasing.If controlled electrical equipment is owed earth connection (or virtual connection, loose disconnected), when taking place to puncture outer casing electrification, earth leakage protective device is can not produce power-off protection.This moment is if leakage current is released by human body and caused the person to get an electric shock when human body touches charged shell.Human electric shock's electric current has been felt to be difficult to stand at 1-2mA, and the outage operating current of general earth leakage protective device is all at 15mA-30mA (the jumbo 300mA that reaches), after if the person gets an electric shock in time the oneself break away from, and need to lean on human electric shock's diffluence trigger protection device power-off protection; Like this, human body just can be subjected to bigger electric shock, even dead (this class accident case all happens occasionally all over the world).

Internal authority tissue, personage are decided to be 30mA/S with " safety define " of human electric shock's electric current ", this all is owing to make the technology of existing earth leakage protective device and limit and determine that this is to preventing that personal electric shock from being very unfavorable data.Thus, though the electrical equipment of use is mixed earth leakage protective device, its shell also must connect effective ground wire, just can reach to prevent personal electric shock casualty accident.Whether the electrical equipment that uses connects effective ground wire, and common people even professional electrician are difficult to determine with directly perceived, and particularly those virtual connection occurs, the easier illiteracy of ground wire that gets loose victimizes.

Be impossible all whether effective by instrumentation detection ground wire before making electrical appliance in actual life by professional electrician at every turn.This has only and adopts high-tech approach innovation in electricity evil protective device series to owe the earth connection protective device, owes to be connected to the electrical equipment energising of imitating ground wire and enables this and can eliminate fundamentally just that the person gets an electric shock, electrical fire to reach volitional check.

Main purpose of the present invention is to provide the control of a kind of employing microelectronic circuit, controlled electrical device is owed supply sockets comprehensive electricity evil defencive function, that can fundamentally eliminate electric noxa elements such as the person electrics shock, electrical fire such as earth connection protection and electric leakage, overcurrent, short circuit, overtemperature and arranges.

The technological deficiency that another purpose of the present invention is to provide a kind of earth leakage protective device of filling up world's prior art all to fail effectively to prevent electric noxa elements such as the person electrics shock, electrical fire, supply socket arrange.

Still a further object of the present invention is to provide a kind of compact conformation, volume is little, cost is low, need not be installed in the electrical equipment supply socket row with integrated protections such as owing earth connection and electric leakage of highly versatile.

The present invention mainly is made up of microelectronics control, protective circuit (A), electromagnetic trip switch (BL) and socket cavity (G), plug (C) etc.; Wherein: microelectronics control, protective circuit comprise: owe earth connection protection testing circuit (1), earth leakage protective testing circuit (2), overcurrent digital delay protection testing circuit (3), short-circuit protection testing circuit (4), overtemperature prote testing circuit (5), IC control circuit (6), back driving circuit (7), overcurrent acousto-optic warning circuit (8), step-down rectifier voltage stabilizing circuit compositions such as (9).

Electromagnetic trip switch (BL) mainly by open, reset button (S1), tripping coil (bL), dropout pull bar (Y), fixed contact (Z1), moving contact (Z2) and leak test eletric button S2 etc. form.

Socket cavity (G) is provided with a plurality of output plugholes such as phase line Nb, Nbx among phase line Lb, the Lbx, ground wire Ea1, Ea1x, ground wire detection line Eb1.

Operation principle of the present invention is as follows: press electromagnetic trip switch BL in use, if load circuit is not owed electric faults such as earth connection and electric leakage at this moment, BL is promptly being detained, and main circuit Lb, Nb are to controlled electric power supply.When certain appears in controlled electrical equipment; as owe to connect wires, during fault such as electric leakage, overcurrent, short circuit, overtemperature; its corresponding protection testing circuit is promptly to IC control circuit input fault signal; trigger thyristor SCR conducting again after the amplification of process IC inside, the shaping; make electromagnetic trip switch BL produce magnetic force and promote to thread off outage reaching the purposes of various electricity evil protection, and the action principle of its each circuit describes in detail in following embodiment.

Fig. 1 a is socket cavity side sectional view of the present invention

Fig. 1 b is socket cavity front plan view of the present invention

Fig. 1 c is the plug bottom surface upward view of socket of the present invention

Fig. 2 a is the supporting plug side sectional view of the present invention

Fig. 2 b is the supporting plug of the present invention bottom surface upward view

Fig. 3 is electric theory diagram of the present invention

Fig. 3 a is the block diagram of Figure of abstract of the present invention

Fig. 4 is the inner structure block diagram of IC control circuit of the present invention (6)

Fig. 5 is the embodiments of the invention circuit diagram

Embodiment: present embodiment is a comprehensive leakage protection socket combination, and its electric principle as shown in Figure 5.Step-down rectifier voltage stabilizing circuit (9) is made up of resistance R 1, capacitor C 1, C2, diode D1, D2, voltage-stabiliser tube DZ etc.; R1 one end connects the power supply phase line and goes out to hold Lb, the negative anodal power supply neutral line that connects of R1 other end polyphone C1, D2 goes out to hold Nb, anodal C1, the D2 interface of connecting of D1, the negative anodal Nb that connects of D1 negative pole polyphone DZ, the C2 both positive and negative polarity also connects the negative positive pole of DZ, and DZ positive and negative electrode two ends output DC voltage-stabilizing detects control circuit and makes power supply for each.

Behind the neon tube H series resistor RH and meet Lb, Nb and become the output voltage indicator light.

Fu is the input protective tube.

Owe earth connection protection testing circuit (1), by capacitor C 3, C4, C5, C6, miniature isolating transformer B, owe ground wire detect normally closed, often open compositions such as contact switches (K1, K2, K3) and rectifier bridge DR; C3 one end connects the power supply phase line and goes out to hold Lb, and the C3 other end polyphone C4 B primary coil of contacting again connects the power supply neutral line and goes out to hold Nb, and C3, C4 interface Eb are for owing the earth connection test side.Eb connects K1, K1 contacts K2, K2 connects this plug Ea, Ea contact electrical network ground wire (this is the state that controlled electrical equipment uses ordinary plug), or Eb connects K1, K1 contacts K3, and K3 connects Eb1, and Eb1 contacts Eb2, Eb2 connects controlled electric appliance casing Eb3, Eb3 connects controlled electric appliance casing other end Ea3, and Ea3 connects Ea2, and Ea2 contacts Ea1, Ea1 connects this plug Ea, Ea contacts electrical network ground wire (this is the state that controlled electrical equipment uses supporting plug), and C5 one end connects Lb, and the C5 other end connects the interface of C4 and B primary coil, the B secondary coil also connects the DR ac input end, the DR output plus terminal connects the input I1 of IC control circuit, and DR output negative terminal connects power supply negative terminal, and C6 is according to polarity and connect the DR positive and negative terminal.

This circuit working principle: under normal situation; Eb passes through K1; K2 and Ea short circuit; or Eb passes through K1; K3; Eb1; Eb2; Eb3; Ea3; Ea2; Ea1 and Ea short circuit; and Ea is a contact electrical network ground wire; the resistance value of electrical network ground wire and neutral line N is very little; therefore connect Nb; miniature isolation transformation B in the Ea loop is elementary just not to be had voltage or has only the very low voltage that is not enough to the trigger protection circuit; so electromagnetic trip switch BL is the work of energy normal power-up just; C5 provides initial current for B; make it improve sensitivity; it also makes C3 that the leakage current of place Ea is reduced to pettiness, and can never constitute influence to the earth leakage protective device of way circuit.When earth connection (or virtual connection, loose disconnected) occurring owing when controlled electrical equipment energising back or in using; miniature isolating transformer B is elementary promptly to produce voltage drop; the secondary induced voltage that also produces; process DR rectification, C6 filtering are to the input I1 of IC control circuit input fault signal; this fault-signal amplifies the output P1 output of back from IC by the amplifying circuit of IC inside; trigger the SCR control utmost point and make the SCR conducting; the SCR conducting also makes dropout switch BL produce magnetic force and promotes the dropout power-off protection, thereby reaches the purpose of owing the earth connection protection.

This product can versatility or the compatibility of matching use, versatility is exactly that controlled electrical equipment adopts common attaching plug to insert in this product to use; Like this, owe the earth connection defencive function and can only protect the owe earth fault of this socket, just can not protect and owe earth connection to the metal-back of controlled electrical equipment to that section of electrical network ground wire circuit; This shortcoming just needs to be remedied by the creepage protection function of this product, because the creepage protection function of this product has higher sensitivity and reliability, its leakage operating current can be below 5-10mA, and also has integrated protection functions such as overcurrent, short circuit, overtemperature; Therefore, it significantly alleviates the harmfulness to person electric shock and electrical fire; This is suitable for the controlled electrical equipment of insulation crust or the controlled electrical equipment of metal shell that the shell ground wire is connected firmly uses.

Matching is exactly the supporting plug (its structure such as Fig. 2 a, 2b, the F2L of its circuit such as Fig. 5) that controlled electrical equipment must adopt this product.Supporting plug is except that three inserting columns (phase line, the neutral line, ground wire) that have with ordinary plug; Also set up one and detect the little inserting column (Eb2) that controlled electric appliance metal shell is owed earth connection on ground wire inserting column side, when supporting plug inserts this socket, Eb2 just contacts Eb1, Eb2 also promotes K1 dialysis K2 simultaneously, transfer contact K3 to, this just can make and detect ground terminal Eb is connected to controlled electrical equipment by the little inserting column of often opening contact, supporting plug of this socket metal-back.So, no matter controlled electrical equipment gold shell joint ground wire point Eb3 or another earth connection point Ea3 that owe to connect (or loose breaking) ground wire, this product can both be made power-off protection; This anti-personal electrical shock protection mode is very safe and reliable, also is world's initiative, and its special hand-held movable electrical appliances that is fit to that those use or metal-back in wet environment uses.

Earth leakage protective testing circuit (2) is made up of zero sequence current mutual inductor CTO, overvoltage protection diode D3, D4, capacitor C 7, C8 and divider resistance R2, R3 etc.; CTO is run through by power supply output line Lb, Nb balance, CTO one end connects power supply negative terminal, and CTO other end polyphone R3 connects IC control circuit input I2, and the forward and reverse polarity of D3, D4 also connects CTO two ends, C7, R2 respectively and connect CTO two ends, C8 two ends also connect the IC control circuit and go into to hold I2 and power supply negative terminal.

This circuit working principle: when controlled electrical equipment electric leakage occurs after energising or in using; CTO promptly produces the input I2 of induced voltage input IC control circuit; when leakage current reaches rated value when (generally being about below the 5-10mA); can trigger SCR conducting, the electromagnetic trip switch BL outage of threading off through the inner amplification of IC, time-delay, shaping, to reach earth leakage protective purpose.

Overcurrent digital delay protection testing circuit (3) is by current transformer CT1 diode D5, capacitor C 9, compositions such as adjustable resistance RP1; CT1 is run through by power supply output line Lb, CT1 one end connects power supply negative terminal, and CT1 other end polyphone D5 both positive and negative polarity, C9 both positive and negative polarity connect power supply negative terminal, and RP1 one end connects the interface of C9 and D5, the RP1 other end connects power supply negative terminal, and the RP1 adjustable point connects IC control circuit input I3.

This circuit working principle: the load current of controlled electrical equipment makes CT1 produce induced voltage; regulate by norm by D5 rectification, C9 filtering, RP1; adjustable point input IC control circuit input I3 from RP1; when the load current overrate; promptly trigger the inner trigger counting of IC; when reaching the scheduled time, to reach the purpose of overcurrent digital delay protection promptly from output output overcurrent signal triggering SCR conducting, the BL outage of threading off.

Short-circuit protection testing circuit (4) is made up of current transformer CT1, diode D6, capacitor C 10, adjustable resistance RP2 etc.; CT1 one end connects power supply negative terminal, and CT1 other end polyphone D6 both positive and negative polarity, C10 both positive and negative polarity connect power supply negative terminal, and RP2 one end connects D6, RP2 interface, and the RP2 other end connects power supply negative terminal, and the RP2 adjustable point connects IC circuit input end I4.

This circuit working principle: when controlled electrical equipment short circuit occurs after energising or in using; run through the very big electric current of CT1 circuit generation this moment and also make CT1 induction high voltage; pass through D6 rectification, C10 filtering, import the quick input I4 of IC circuit from the RP2 adjustable point; make the P1 output signal trigger the SCR conducting fast; the BL outage of threading off is to reach the short circuit purpose of protection fast.

Overtemperature prote testing circuit (5) is made up of temperature-sensing element Rt, capacitor C 11, adjustable resistance RP3 etc.; Rt one end connects power positive end, and Rt other end polyphone C11 both positive and negative polarity connects power supply negative terminal, and RP3 one end connects Rt, C11 interface, and the RP3 other end connects power supply negative terminal, and the RP3 adjustable point connects IC control circuit input I5.

This circuit working principle: Rt can be embedded in the heating position of this cavity or external controlled electrical equipment; when they surpass rated temperature; the RP3 adjustable point is to IC control circuit input I5 input overtemperature signal; through the inner amplification of IC control circuit; trigger the SCR conducting, electromagnetic trip switch BL threads off outage to reach the purpose of overtemperature prote.

Internal structure block diagram such as Fig. 4 of IC control circuit (6), it comprises that differential amplifier circuit (a), delay circuit (b), Schmidt circuit (c), front wheel driving circuit (d), voltage amplifier circuit (e), overcurrent counting delay circuit (f), the quick power amplifier of short circuit (g), voltage amplifier circuit (h), cadence signal produce circuit logical combinations such as (j); It is provided with three outputs such as five inputs such as I1, I2, I3, I4, I5 and P1, P2, P3, I1, I5 are the voltage amplification input, I2 is differential amplification input, I3 is counting time-delay input, I4 is quick power amplifier input, P1 is the front wheel driving output, and P2, P3 are the cadence signal output.

Back driving circuit (7) is made up of thyristor SCR, electromagnetic trip switch BL, diode D7, D8, capacitor C 12, C13, resistance R 5, piezo-resistance Rv etc.; The SCR control utmost point connects IC control circuit output P1, the SCR negative electrode connects power supply negative terminal, the negative anodal power supply that connects of SCR anode series BL, D8 goes out to hold phase line Lb, C12 is according to polarity and connect the SCR control utmost point, negative electrode, the anodal SCR anode that connects of D7, the D7 negative pole connects the D8 negative pole, and C13 one end connects the SCR anode, C13 other end polyphone R5 connects power supply negative terminal, and Rv also connects AC power and goes out rapid Lb, Nb.

The control utmost point of this circuit working principle: SCR is triggered by IC control circuit output P1 output fault-signal, makes the SCR conducting drive electromagnetic trip switch BL dropout outage; C12 is the filter interference capacitors, and C13, R5 form overvoltage absorption circuit, D7 is that continued flow tube, D8 are the unidirectional protection pipe, and Rv is the surge peak pressure that piezo-resistance absorbs alternating current circuit.

Push-button switch S2, resistance R S form leak test electricity circuit, and S2 one end connects the power supply neutral line and goes into to hold Na, and S2 other end polyphone RS connects the power supply phase line and goes out to hold Lb; Press S2 and can make electromagnetic switch BL dropout outage as analog leakance test.

Overcurrent acousto-optic warning circuit (8) is made up of resistance R 4, luminous tube LED, buzzer BZ etc.; The anodal polyphone of LED R4 connects IC control circuit output P3, and the LED negative pole connects power supply negative terminal, the anodal IC control circuit output P2 that connects of BZ, and the BZ negative pole connects power supply negative terminal; The IC control circuit begins to do the overcurrent timing when controlled electrical equipment occurs exceeding rated current, and the IC control circuit also by output P2, P3 output cadence signal, makes LED and BZ send the acousto-optic warning of beat at the same time.

Claims (10)

1. comprehensive leakage protection socket combination; comprise by microelectronics control, protective circuit, electromagnetism disengagement pass etc. and forming, it is characterized in that microelectronics control, protective circuit comprise that owing earth connection protects testing circuit (1), earth leakage protective testing circuit (2), overcurrent digital delay protection testing circuit (3), short-circuit protection testing circuit (4), overtemperature prote testing circuit (5), IC control circuit (6), back driving circuit (7), acousto-optic warning circuit (8), step-down rectifier voltage stabilizing circuit (9) and socket cavity (G) thereof, plug compositions such as (C).

2. the earth connection protection testing circuit (1) of owing according to claim 1; it is owed earth connection detection capacitor C 3 one ends connection power supply phase line and goes out to hold Lb; the C3 other end polyphone capacitor C 4 elementary connection power supply of the isolating transformer B neutral line of contacting again goes out to hold Nb; capacitor C 3; capacitor C 4 interface Eb connect normally closed; often open contact K1; when controlled electrical equipment uses ordinary plug; contact K1 contact contact K2; K2 connects this plug ground wire inserting column Ea; Ea contact electrical network ground wire; when controlled electrical equipment uses supporting plug of the present invention (F2L); contact K1 is pushed away by the little inserting column Eb2 that supporting plug (F2L) detects ground wire; contact K1 and contact K2 are opened circuit; contact K1 contacts contact K3 automatically simultaneously; contact K3 connects the little jack Eb1 of detection ground wire of this socket (G); little jack Eb1 contacts little inserting column Eb2; little inserting column Eb2 connects an end Eb3 of controlled electric appliance metal shell joint ground wire; the other end Ea3 of controlled electric appliance metal shell joint ground wire connects the ground wire inserting column Ea2 of supporting plug (F2L); Ea2 contacts the ground wire jack Ea1 of this socket cavity (G); Ea1 connects this plug ground wire inserting column Ea; Ea contact electrical network ground wire; capacitor C 5 one ends connect the power supply phase line and go out to hold Lb; capacitor C 5 other ends connect capacitor C 4 and the elementary interface of isolating transformer B; isolating transformer B time level also meets rectifier bridge DR and exchanges into end; rectifier bridge DR direct current is just going out end and is connecting IC control circuit input I1; rectifier bridge DR direct current is born out end and is connected power supply negative terminal, and capacitor C 6 is according to polarity and connect that rectifier bridge DR is positive and negative to go out end.

3. according to claim 2 owe earth connection protection testing circuit (1) owe that earth connection detects capacitor C 3, C4, C5 can implement with resistive method; isolating transformer B available light electric coupling method is implemented, and rectifier bridge DR can implement with the interchange input method of halfwave rectifier or not rectification.

4. supporting plug according to claim 2 (F2L), it does not have three main inserting columns such as phase line (Lb1), the neutral line (Nb1), ground wire (Ea2) and also is provided with one to detect the little inserting column of ground wire (Eb2), (Lb1), (Nb1) connect the load circuit of controlled electrical equipment respectively with lead, (Ea2), (Eb2) connect two differences of controlled electric appliance metal shell respectively with lead.

5. socket cavity according to claim 1 (G), be provided with phase line output plughole (Lb), (Lbx) neutral line output plughole (Nb), (Nbx), ground wire output plughole (Ea1), (Ea1x), detect ground wire output plughole (Eb1) and electromagnetic trip switch (BL), open, reset button (S1), leak test eletric button (S2).

6. IC control circuit according to claim 1 (6); its inside is by differential amplifier circuit (a); delay circuit (b); Schmidt circuit (c); front wheel driving circuit (d); voltage amplifier circuit (e); digital delay circuit (f); quick power amplifier (g); voltage amplifier circuit (h); cadence signal generation circuit logical combinations such as (j); I1 wherein is an input of owing earth connection protection detection signal; I2 is the input of earth leakage protective detection signal; I3 is the input of overcurrent digital delay protection detection signal; I4 is the input of short-circuit protection detection signal; I5 is the input of overtemperature prote detection signal; P1 is the output of front wheel driving signal; P2 is the output of sound caution cadence signal; P3 is the output of light caution cadence signal, the differential amplifier circuit (a) of above-mentioned IC control circuit (6); delay circuit (b); Schmidt circuit (c); front wheel driving circuit (d); voltage amplifier circuit (e); digital delay circuit (f); quick power amplifier (g); voltage amplifier circuit (h); the logical combination of beat generation signal circuit circuit such as (j) can be implemented by separated electronic combination of circuits method.

7. back driving circuit according to claim 1 (7), the control utmost point of its thyristor SCR connects the output P1 of IC control circuit, thyristor SCR negative electrode connects power supply negative terminal, the thyristor SCR anode series electromagnetic trip switch BL negative anodal power supply phase line that connects of diode D8 of contacting again goes out to hold Lb, the anodal thyristor anode that connects of diode D7, diode D7 negative pole connects diode D8 negative pole, capacitor C 13 1 ends connect the thyristor anode, capacitor C 13 other end serial resistance R5 connect the thyristor cathode terminal, the thyristor SCR of above-mentioned back driving circuit can implement with bidirectional thyristor or solid switch method, and electromagnetic trip switch BL can implement with fully automatic electric magnetic switch or A.C. contactor method.

8. earth leakage protective testing circuit according to claim 1 (2); its zero sequence current mutual inductor CTO is run through by power supply output phase line Lb and neutral line Nb balance; the end of zero sequence current mutual inductor CTO connects power supply negative terminal; zero sequence current mutual inductor CTO other end serial resistance R3 connects the input I2 of IC control circuit; diode D3; the positive antipole of D4 to and connecting to neutral preface current transformer CTO two ends; capacitor C 7; resistance R 2 and connecting to neutral preface current transformer CTO two ends; capacitor C 8 one ends connect IC control circuit input I2; capacitor C 8 other ends connect power supply negative terminal; leak test eletric button S2 one end connects power supply input neutral line Na, and leak test eletric button S2 other end serial resistance RS connects power supply output phase line Lb.

9. overcurrent digital delay protection testing circuit (3) according to claim 1; its current transformer CT1 is run through by power supply output phase line Lb; CT1 one end connects power supply negative terminal; current transformer CT1 other end polyphone diode D5 both positive and negative polarity, capacitor C 9 both positive and negative polarities connect power supply negative terminal; adjustable resistance RP1 one end connects diode D5, capacitor C 9 interfaces; the adjustable resistance RP1 other end connects power supply negative terminal, and adjustable resistance RP1 adjustable point connects IC control circuit input I3.

10. short-circuit protection testing circuit according to claim 1 (4); its current transformer CT1 one end connects power supply negative terminal; current transformer CT1 other end polyphone diode D6 both positive and negative polarity, capacitor C 10 both positive and negative polarities connect power supply negative terminal; adjustable resistance RP2 one end connects diode D6, capacitor C 10 interfaces; the adjustable resistance RP2 other end connects power supply negative terminal, and adjustable resistance RP2 adjustable point connects IC control circuit input I4.

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