CN1384578A

CN1384578A - Comprehensive leakage protection plug

Info

Publication number: CN1384578A
Application number: CN 01114663
Authority: CN
Inventors: 钟汝祥
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-04-27
Filing date: 2001-04-27
Publication date: 2002-12-11

Abstract

The comprehensive leakage protection plug 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 has electromagnetic switch. The present invention has compact structure, small volume, low cost and very low power consumption. The protection socket as one "direct connection" type protector is suitable for use in electric drill and other electric tools with metal casing.

Description

Comprehensive leakage protection plug

The present invention relates to a kind of attaching plug that controlled electrical device is owed comprehensive electricity evil defencive functions such as wiring and electric leakage, overcurrent, short circuit, overtemperature that 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 attaching plug 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 the 3rd.

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 the attaching plug cavity; 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.Leakage current was promptly released by human body and was caused the person to get an electric shock if human body touches charged shell this moment.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 to reach volitional check, and this just can fundamentally eliminate, and the person gets an electric shock, the electric noxa element of electrical fire.

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

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 the attaching plug of the technological deficiency of electric noxa elements such as person electric shock, electrical fire.

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 attaching plug 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 plug body (C) etc.; Wherein: microelectronics control, protective circuit (A) comprising: 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.

Shell (C) comprises input plug (F1), and it is provided with La, Na, three inserting columns of Ea, output wiring terminal row (G), and it is provided with Lb, Nb, four binding posts of Ea1, 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 side sectional view of the present invention

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

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

Fig. 2 is electric theory diagram of the present invention

Fig. 2 a is the block diagram of Figure of abstract of the present invention

Fig. 3 is the inner structure block diagram of IC control circuit of the present invention (6)

Fig. 4 is embodiments of the invention 1 circuit diagram

Fig. 5 is present embodiment 2 circuit diagrams

Embodiment 1: present embodiment is a comprehensive leakage protection plug, and its electric principle as shown in Figure 4.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 reaches compositions such as 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 output wiring terminal Eb1,1 Eb2 of the external controlled electrical equipment of Eb1 (D) metal-back, the ground wire inserting column Ea of plug (F1) connects output earth terminal Ea1, outer another Ea2 of acceptor (D) metal-back of Ea1, 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 is by polyphone Eb1, Eb2, Ea2, Ea1 and Ea short circuit; and the current potential of Ea is approximately equal to the Nb current potential; therefore connect that miniature isolation transformation B in Nb, the Ea loop is elementary just not to be had voltage or have 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 occurring owing after the controlled electrical equipment energising or in using; pine is disconnected) time; the elementary end of miniature isolating transformer B promptly passes through C3; the Nb that the Lb that C4 and C5 connect and the other end connect produces voltage drop; the secondary induced voltage that also produces; through the DR rectification; C6 filtering is 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.

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 also connects the IC circuit and goes 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 be can be embedded in this plug cavity or the heating position of external controlled electrical equipment in; 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.

Embodiment 2: the characteristics of present embodiment are outstanding earth connection protection and the earth leakage protective of owing;, and make indirect overcurrent protection with overtemperature prote, protective tube is made short-circuit protection; help further reduced volume like this and reduce cost, be more suitable for the controlled electrical equipment of general small-power and use.

The electricity 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.

Fu is the input protective tube.

Owe earth connection protection testing circuit (1); by capacitor C 3, C4, C5, C6; miniature isolating transformer B; and compositions C3 one end such as rectifier bridge DR connection power supply phase line goes out to hold Lb; 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 output wiring terminal Eb1,1 Eb2 of the external controlled electrical equipment of Eb1 (D) metal-back, the ground wire inserting column Ea of plug (F1) connects output earth terminal Ea1, outer another Ea2 of acceptor (D) metal-back of Ea1, 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.

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

Overtemperature prote testing circuit (5) is made up of temperature-sensing element Rt, capacitor C 9, adjustable resistance RP etc.; Rt one end connects power positive end, and Rt other end polyphone C9 both positive and negative polarity connects power supply negative terminal, and RP one end connects Rt, C9 interface, and the RP other end connects power supply negative terminal, and the RP adjustable point connects IC control circuit input I3.

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 inputs such as I1, I2, I3 and P1 output, and I1, I3 are the voltage amplification input, and I2 is differential amplification input, and P1 is the front wheel driving output.

Back driving circuit (7) is made up of thyristor SCR, electromagnetic trip switch BL, diode D4, D5, capacitor C 10, C11, 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, D5 goes out to hold phase line Lb, C11 is according to polarity and connect the SCR control utmost point, negative electrode, the anodal SCR anode that connects of D4, the D4 negative pole connects the D5 negative pole, and C10 one end connects the SCR anode, C10 other end polyphone R5 connects power supply negative terminal, and Rv also connects AC power and goes out rapid Lb, Nb.

Present embodiment 2 circuit working principles explain that at embodiment 1 this does not heavily chat.

Claims

1. comprehensive leakage protection plug; comprise by microelectronics control, protective circuit (A), electromagnetism disengagement pass (BL) etc. and forming, it is characterized in that microelectronics control, protective circuit (A) 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 plug body compositions such as (C) thereof.

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 ground wire detection line output wiring terminal Eb1; the external controlled electrical equipment of binding post Eb1 (D) metal-back Eb2 point; this plug ground wire inserting column Ea connects ground wire output wiring terminal Ea1; another Ea2 of the external controlled electrical equipment of ground wire output wiring terminal Ea1 (D) metal-back; 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 (6) 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. plug body according to claim 1 (C), in be provided with phase line input inserting column (La,) neutral line input inserting column (Na), ground wire input inserting column (Ea) and phase line output lead (Lb), neutral line output lead (Nb), ground wire output lead (Ea1), detect ground wire output lead (Eb1) and electromagnetic trip switch (BL), open, reset button (S1), leak test eletric button (S2).

5. 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; 13 inputs for 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 thyristor SCR 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 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.