CN1053538C

CN1053538C - Self-generating power AC two-conductor switch using mutual inductor

Info

Publication number: CN1053538C
Application number: CN94114032A
Authority: CN
Inventors: 翁天禄
Original assignee: Individual
Current assignee: SHANGHAI CHENGJIA ELECTRONIC TECHNOLOGY Co Ltd
Priority date: 1994-12-15
Filing date: 1994-12-15
Publication date: 2000-06-14
Anticipated expiration: 2014-12-15
Also published as: CN1124887A

Abstract

The present invention provides seventeen technical schemes for establishing AC two-wire type switch circuits of self generation power supplies by transformers. Noncontact on-off modes are adopted in main loops of ten technical schemes, and contact on-off modes are adopted in main loops of seven technical schemes. The technical schemes of the present invention are the supplementation and the derivative of an isonym invention with an application number of 94112284.0, so the types of basic structures of the whole invention are widened. Parts of background art and characteristics associated with the present invention are shown in the isonym invention.

Description

Authigenic power supply uses the AC two-conductor switch of instrument transformer

The present invention relates to 17 kinds of AC two-conductor switch circuit arrangements, this switching circuit has only two splicing ears, and it with in the series connection form incoming transport circuit, is applicable to the break-make of control load.

The present invention is replenishing of application number 94112284.0 application for a patent for invention cases of the same name and derivation, thereby has widened the kind of the basic structure of this AC two-conductor switch.

In 17 kinds of circuit arrangements of the present invention, the major loop of ten kinds of schemes uses contactless break-make form, and promptly the break-make of loaded work piece electric current is to rely on mainly the conducting of the two-way main circuit current assembly of being made up of transistor or thyristor of appellation and end and realize; The major loop of seven kinds of schemes uses contact break-make form, and promptly the break-make of loaded work piece electric current is to rely on the closure and the disjunction of the normal opened contact of mechanical relay to realize.

Among the present invention, major loop uses the circuit arrangement background technology of contactless break-make form, and is identical with the related content of above-mentioned application for a patent for invention case of the same name, no longer repeats; Use the circuit arrangement that contact break-make form is arranged for major loop, just known to the applicant, there is not the circuit of two wires form in prior art.

Except the simplest form, as the AC two-conductor switch that control switch uses, its inside is provided with control circuit, and control circuit carries out break-make control to major loop, by the device of the appellation authigenic power supply power supply as control circuit.Under the form of two wires, authigenic power supply can not directly obtain through conversion from AC power, but obtains the increment of this on-state voltage drop and off state current, additional on-state voltage drop of appellation and additional off state current from the on-state voltage drop that increases switch and off state current.

The objective of the invention is to start new direction of development of AC two-conductor switch, fundamentally change the method that prior art is set up authigenic power supply, realize the thing that prior art can't be finished, and AC two-conductor switch can be reached:

The first, use the circuit arrangement of contactless break-make form for major loop, compared with prior art, reduce additional on-state voltage drop and additional off state current exponentially, especially under the large current load condition, effect is more remarkable; Use the circuit arrangement that contact break-make form is arranged for major loop, the present invention finishes the form of two linearizes with the additional on-state voltage drop of minimum.

The second, subsidiary overload signal can provide overload protection and short-circuit protection easily.

The 3rd, can be under various non-sinusoidal waveform Power Supplies Condition operate as normal.

The 4th, can set up multiple authigenic power supply, make switch inside be easy to adapt to various control circuits and control mode.

The 5th, in having several schemes of current stabilization assembly, compared with prior art, the scope of application of expand cooperative exchanges supply voltage exponentially.

Describe the present invention below with reference to each drawings and Examples, wherein:

Fig. 1 to Figure 11 illustrates 11 kinds of circuit diagrams of the two-way main circuit current assembly of the present invention.

Figure 12 to Figure 28 is respectively the circuit diagram of 17 kinds of schemes of first kind of scheme to the of the present invention.

Figure 29 is another circuit diagram of first kind of scheme of the present invention.

Figure 30 to Figure 48 illustrates the detailed circuit diagram of nineteen embodiment of the present invention respectively.

Symbol description among Figure 12 to Figure 29 is as follows:

The 1--AC power; The 2--load; 3 and 3 '--two splicing ears of AC two-conductor switch; The two-way main circuit current assembly of 4--; The two-way current stabilization assembly of 5--; The 6--regulator rectifier circuit; 6 '--second regulator rectifier circuit; The 7--control circuit; 7 '--second control circuit; The 8--rectification circuit; The 9--voltage stabilizing circuit; The unidirectional current stabilization assembly of 10--; The coil of 11--mechanical relay; The normal opened contact of 12--mechanical relay; H1--has the instrument transformer of L1, L2 and three coils of L3 or has the instrument transformer of L1, L2, L3 and four coils of L3 '; H2--has the instrument transformer of L4 and two coils of L5; R--resistance; The Z--impedance; The D--diode; D1--first diode; D2--second diode.

Among Fig. 1, two-way main circuit current assembly is a bidirectional thyristor, has two main electrode terminal T1 and T2 and a control gate terminal G1, and control signal is imported between G1 and T1.Among Fig. 2, this assembly is made up of two bidirectional thyristors and a resistance, has two main electrode terminal T1 and T 2 and a control gate terminal G1, and control signal is imported between G1 and T1.Among Fig. 3, this assembly is become with a two-way photoelectricity thyristor groups by a light-emitting diode, has two main electrode terminal T1 and T2 and two control gate terminal G1 and G2, and control signal is imported between G1 and G2.Among Fig. 4, this assembly is made up of two V-type groove metal oxide isolated-gate field effect transistor (IGFET)s (VMOS).Among Fig. 5, this assembly is made up of two bipolar transistors.Among Fig. 6, this assembly is made up of two insulated gate bipolar transistors (IGBT).Among Fig. 4 to Fig. 6, all have two main electrode terminal T1 and T2 and two control gate terminal G1 and G2, control signal is imported between G1 and G2.Among Fig. 7, this assembly is made up of a unidirectional thyristor and four diodes.Among Fig. 8, this assembly is made up of a V-type groove metal oxide isolated-gate field effect transistor (IGFET) and four diodes.Among Fig. 9, this assembly is made up of a bipolar transistor and four diodes.Among Figure 10, this assembly is made up of an insulated gate bipolar transistor and four diodes.Among Fig. 7 to Figure 10, all have two main electrode terminal T1 and T2, two controls utmost point pipe G1 and G2 and start terminal S, control signal is imported between G1 and G2.Among Figure 11, this assembly is made up of two unidirectional thyristors, has two main electrode terminal T1 and T2 and two control gate terminal G1 and G2, and this assembly need have two synchronous control signals to import between G1 and T1 and G2 and T2 respectively.

In 17 kinds of scheme circuit diagrams of the present invention (Figure 12 to Figure 28), terminal 3 and 3 ' is two splicing ears of AC two-conductor switch, inserts in the alternating current circuit of being made up of AC power 1 and load 2.

For first kind of scheme (Figure 12), the 11 kind of scheme (Figure 22) and the 12 kind of scheme (Figure 23), authigenic power supply is made up of impedance Z or two-way current stabilization assembly 5, instrument transformer H1 and regulator rectifier circuit 6, wherein H1 has three coil L1, L2 and L3, coil L1 is connected to terminal 3 and 3 ' by two-way current stabilization assembly 5 or impedance Z, coil L2 is connected to terminal 3 and 3 ' by two the main electrode T1 of two-way main circuit current assembly 4 and the normal opened contact 12 of T2 or mechanical relay, and coil L3 is connected to the input of regulator rectifier circuit 6.The output voltage of regulator rectifier circuit 6 is exactly an authigenic power supply voltage, and as the power supply of control circuit 7, therefore, the output of regulator rectifier circuit 6 is connected to the power end of control circuit 7.The output of control circuit 7 is connected to the control gate terminal G1 of two-way main circuit current assembly 4 and the coil 11 of G2 or mechanical relay, the control signal of control circuit 7 output by G1 and G2 control two-way main circuit current assembly 4 conducting and by or closure and the disjunction by the coil 11 control normal opened contacts 12 of mechanical relay of the control voltage of control circuit 7 outputs.

The two-way main circuit current assembly 4 of first kind of scheme can use any among Fig. 1 to Figure 11, owing to do not have the G2 terminal among Fig. 1 and Fig. 2, should insert the T1 terminal to the lead-in wire that is connected to the G2 terminal during use.If use the two-way main circuit current assembly of Figure 11, should be as shown in figure 29, set up coil L3 ', second regulator rectifier circuit 6 ' and the second control circuit 7 ', the output of two control circuits is connected to G1, T1 and G2, T2 respectively, uses two synchronous control signals to control the conducting of two-way main circuit current assembly 4 and end.

For second kind of ten kinds of scheme of scheme to the (Figure 13 to Figure 21) and the 13 kind of 17 kinds of schemes of scheme to the (Figure 24 to Figure 28), their circuit structure identical point is as follows: authigenic power supply all comprises instrument transformer H2, rectification circuit 8 and voltage stabilizing circuit 9, wherein instrument transformer H2 has two coil L4 and L5, coil L4 is connected to terminal 3 and 3 ' by two the main electrode T1 of two-way main circuit current assembly 4 and the normal opened contact 12 of T2 or mechanical relay, wherein T1 is connected with 3 ', and coil L5 is connected to the input of rectification circuit 8.The output of rectification circuit 8 is connected to the input of voltage stabilizing circuit 9, and the output voltage of voltage stabilizing circuit 9 is exactly an authigenic power supply voltage, and as the power supply of control circuit 7, therefore, the output of voltage stabilizing circuit 9 is connected to the power end of control circuit 7.The output of control circuit 7 is connected to the coil 11 of the control gate terminal G1 of two-way main circuit current assembly 4 and G2 or control gate terminal G1 and main electrode terminal T1 or mechanical relay, the control signal of control circuit 7 outputs by G1 and G2 or G1 and T1 control two-way main circuit current assembly 4 conducting and by or closure and the disjunction by the coil 11 control normal opened contacts 12 of mechanical relay of the control voltage of control circuit 7 outputs.

For ten kinds of schemes of second kind of scheme to the, their circuit structure difference is, the lead-out terminal of the rectification circuit 8 of the 4th kind of scheme (Figure 15) and the 9th kind of scheme (Figure 20) and the common junction of voltage stabilizing circuit 9, the common junction of control circuit 7 and main electrode terminal T1 connect, and second kind of scheme (Figure 13), the third scheme (Figure 14), the lead-out terminal of the rectification circuit 8 of the 5th kind of eight kinds of scheme of scheme to the (Figure 16 to Figure 19) and the tenth kind of scheme (Figure 21) and the common junction of voltage stabilizing circuit 9, the common junction of control circuit 7 and control gate terminal G2 connect; Rectification circuit 8 another lead-out terminals, second kind of scheme (Figure 13) are to be connected to terminal 3 by a resistance R; The third scheme (Figure 14) is the start terminal S that is connected to two-way main circuit current assembly 4 by a resistance R; The 4th kind of scheme (Figure 15) and the 5th kind of scheme (Figure 16) are to be connected to terminal 3 by a unidirectional current stabilization assembly 10; The 6th kind of scheme (Figure 17) is to be connected to start terminal S by a unidirectional current stabilization assembly 10; The 7th kind of scheme (Figure 18) is a lead-out terminal that is connected to a bridge rectifier, and another lead-out terminal of this bridge rectifier is connected to terminal G2, and two input terminals of this bridge rectifier are connected to terminal 3 and 3 ' by an impedance Z; The 8th kind of scheme (Figure 19) is a lead-out terminal that is connected to a bridge rectifier by a unidirectional current stabilization assembly 10, another lead-out terminal of this bridge rectifier is connected to terminal G2, and two input terminals of this bridge rectifier are connected to terminal 3 and 3 ' respectively; The 9th kind of scheme (Figure 20) and the tenth kind of scheme (Figure 21) are the negative poles that is connected to the first diode D1, the positive pole of the first second tube sheet D1 is connected with the negative pole of the second diode D2 and an end of impedance Z, the positive pole that the other end of impedance Z is connected to terminal 3, the second diode D2 is connected to terminal 3 '.

For 17 kinds of schemes of the 13 kind of scheme to the, two lead-out terminals of rectification circuit 8 are except that the input that is connected to voltage stabilizing circuit, also be connected to different elements or assembly, be two lead-out terminals of rectification circuit 8, the 13 kind of scheme (Figure 24) is to be connected to terminal 3 and 3 ' by resistance R and diode D; The 14 kind of scheme (Figure 25) is to be connected to terminal 3 and 3 ' by a unidirectional current stabilization assembly 10; The 15 kind of scheme (Figure 26) is that one of them terminal is connected with the negative pole of the first diode D1, another terminal is connected with terminal 3 ' with the positive pole of the second diode D2, the positive pole of the first diode D1 is connected with the negative pole of the second diode D2 and an end of impedance Z, and the other end of impedance Z is connected to terminal 3; The 16 kind of scheme (Figure 27) is two lead-out terminals that are connected to a bridge rectifier respectively, and two input terminals of this bridge rectifier are connected to terminal 3 and 3 ' by impedance Z; The 17 kind of scheme (Figure 28) is two lead-out terminals that are connected to a bridge rectifier by a unidirectional current stabilization assembly 10, and two input terminals of this bridge rectifier are connected to terminal 3 and 3 ' respectively.

For second kind of ten kinds of scheme of scheme to the (Figure 13 to Figure 21) and the 13 kind of 17 kinds of schemes of scheme to the (Figure 24 to Figure 28), above-mentioned element relevant with the output of rectification circuit 8 or assembly or bridge rectifier have constituted the part of each scheme authigenic power supply.

The two-way main circuit current assembly 4 of second kind of scheme (Figure 13), the 5th kind of scheme (Figure 16) and the tenth kind of scheme (Figure 21) can use any among Fig. 4 to Figure 10.The two-way main circuit current assembly 4 of the third scheme (Figure 14) and the 6th kind of scheme (Figure 17) can use any among Fig. 7 to Figure 10.The two-way main circuit current assembly 4 of the 4th kind of scheme (Figure 15) and the 9th kind of scheme (Figure 20) can use any among Fig. 1 to Fig. 3, but, when using Fig. 3 assembly, needs be connected to T1 to G2.The two-way main circuit current assembly 4 of the 7th kind of scheme (Figure 18) and the 8th kind of scheme (Figure 19) can use any among Fig. 3 to Figure 10.

In 17 kinds of schemes of the present invention, when two-way main circuit current assembly conducting or the normal opened contact of mechanical relay when closed, the production method of authigenic power supply is identical.At this moment, among the coil L2 or flow through the operating current of load among the coil L4, then on the coil L3 or the induced potential on the coil L5 through behind the regulator rectifier circuit as authigenic power supply.Two-way main circuit current assembly by the time or during the normal opened contact disjunction of mechanical relay, the production method difference of authigenic power supply.For first kind of scheme (Fig. 1), the 11 kind of scheme (Figure 22) and the 12 kind of scheme (Figure 23), at this moment, coil L1 among the instrument transformer H1 is by impedance Z or two-way current stabilization assembly 5 and load and AC power formation loop, in the more coil L1 of the number of turn, there is certain electric current to flow through, the existing input current of this electric current as instrument transformer H1, then the induced potential on the secondary coil L3 through behind the regulator rectifier circuit as authigenic power supply; For all the other schemes, at this moment, be earlier on two outputs of rectification circuit 8, to form direct voltage, generation authigenic power supply through voltage stabilizing circuit 9 after again.This direct voltage on two outputs of rectification circuit 8, second kind of scheme (Figure 13) and the 5th kind of scheme (Figure 16) are that what to be formed by the unilateal conduction path between load, resistance R or unidirectional current stabilization assembly 10, G2 and the T1 by AC power (in the two-way main circuit current assembly of Fig. 7 to Figure 10, is a unilateal conduction diode between G2 and the T1; In the two-way main circuit current assembly of Fig. 4 to Fig. 6, at this moment, between G2 and the T1 emitter and collector that the source electrode of the grid VMOS pipe that do not have positive bias-voltage and drain electrode or base stage do not have the bipolar transistor of injection current, have the unilateal conduction path equally); The third scheme (Figure 14) and the 6th kind of scheme (Figure 17) are to be formed by bridge rectifier, resistance R or unidirectional current stabilization assembly 10 in load, the two-way main circuit current assembly 4 by AC power; The 4th kind of scheme (Figure 15), the 13 kind of scheme (Figure 24) and the 14 kind of scheme (Figure 25) are formed by load, unidirectional current stabilization assembly 10 or diode D and resistance R by AC power; The 7th kind of scheme (Figure 18), the 8th kind of scheme (Figure 19), the 16 kind of scheme (Figure 27) and the 17 kind of scheme (Figure 28) are formed by load, bridge rectifier, impedance Z or unidirectional current stabilization assembly 10 by AC power; The 9th kind of scheme (Figure 20) and the 15 kind of scheme (Figure 26) are formed by load, impedance Z, the first diode D1 by AC power, and the effect of the second diode D2 herein is to provide alternating current path for capacitive reactances; The tenth kind of scheme (Figure 21) is to be formed by the unilateal conduction path between load, impedance Z, the first diode D1, G2 and the T1 by AC power, and the effect of the second diode D2 is same as described above herein.

In 17 kinds of schemes of the present invention, authigenic power supply has solved the power supply of two-conductor switch internal control circuit and has supplied with, and so just can carry out break-make control to load according to the control mode of control circuit.

The parameter of instrument transformer H1 and H2 decides according to the method for designing of protective current transformer.For instrument transformer H1, coil L1 and coil L2 are two windings, and coil L3 is a secondary winding.The operating current that the input current of coil L2 is load, the input current of coil L1 can change by the character of change impedance Z and the current stabilization numerical value of size or two-way current stabilization assembly 5.If two wiretaps under the break-make two states, to authigenic power supply require identically, then the number of ampere turns of coil L1 should be identical with the number of ampere turns of coil L2.Determine the size of the secondary output voltage on the coil L3, should decide according to the form of authigenic power supply voltage and capacity requirement and regulator rectifier circuit.For instrument transformer H2, coil L4 is a winding, and coil L5 is a secondary winding.The operating current that the input current of coil L4 is load.Definite method of the secondary output voltage size on the coil L5, identical with above-mentioned coil L3, no longer repeat.

For 17 kinds of scheme circuit diagrams of the present invention of Figure 12 to Figure 28, when two-way main circuit current assembly 4 conductings or the additional on-state voltage drop of the normal opened contact 12 of mechanical relay when closed be interchange pressure drop on the coil L2 or on the coil L4.Two-way main circuit current assembly 4 by the time or additional off state current during normal opened contact 12 disjunctions of mechanical relay, for Figure 12, Figure 22 and Figure 23, be the alternating current that flows through among the coil L1; For Figure 13, Figure 15, Figure 16, Figure 24 and Figure 25, be the half-wave current that flows through in resistance R or the unidirectional current stabilization assembly 10; For Figure 18, Figure 20, Figure 21, Figure 26 and Figure 27, be the alternating current that flows through in the impedance Z; For Figure 19 and Figure 28, be the alternating current that flows into the bridge rectifier input; For Figure 14 and Figure 17, be because the recruitment of the alternating current of the two-way main circuit current assembly 4 interior bridge rectifier inputs of the inflow that the electric current in resistance R or the unidirectional current stabilization assembly 10 causes.

Shown in Figure 30 is an embodiment detailed circuit diagram of first kind of scheme of the present invention.This circuit is a TW two wire temperature detect switch (TDS), and P1 and P1 ' are two splicing ears of switch.Load is a heater, and load current is 1 ampere.Because used two-way current stabilization assembly in the circuit, the scope of application of AC supply voltage is 25 volts to 220 volts, frequency is 50 hertz.Instrument transformer H11 is equivalent to the H1 of Figure 12, and two-way current stabilization assembly is made up of BG11, BG12, D15, D16, WG11, WC12, DZ11, DZ12, R16, R17.Two-way main circuit current assembly uses the form of Fig. 3.Regulator rectifier circuit is made up of four diodes of D11 to D13 and integrated circuit (IC) 11 and peripheral cell thereof.Control circuit is made up of IC12 and peripheral cell thereof, and wherein R13 is the slow change type negative tempperature coefficient thermistor.When R13 was cooled to 30K Ω, IC12 the 3rd pin output high level made two-way photoelectricity thyristor conducting in the TR11, the heater energising.When the resistance of the R13 that is heated drops to 7.5K Ω, IC12 the 3rd pin output low level, thus two-way photoelectricity thyristor is ended, the heater outage.This circuit is that the additional on-state voltage drop of 1 ampere-hour is 0.4 volt at load current, and additional off state current is 5 milliamperes.

Except that R13, other element is described as follows in the circuit:

L11 5500 circles, 0.03 millimeter in line footpath

L12 30 circles, 0.50 millimeter in line footpath

L13 1000 circles, the 0.13 millimeter IC11=CW7663 C11=0.047 μ F in line footpath

IC12＝LM555 C12＝22μF

TR11＝SP1110 C13＝0.01μF

D11 to D14=1N4001 R11=300K Ω

D15＝D16＝1N4007 R12＝100KΩ

BG11＝BG12＝3DA87H R14＝15KΩ

WC11＝WC12＝3DH114 R15＝300Ω

Shown in DZ11=DZ12=2CW53 R16=R17=120K Ω Figure 31 is an enforcement detailed circuit diagram of second kind of scheme of the present invention.This circuit is a TW two wire short circuit overcurrent protection switch with auto-reset function, and Q1 and Q1 ' are two splicing ears of switch.Instrument transformer H21 is equivalent to the H2 of Figure 13, and R18 is equivalent to the R of Figure 13.Rectification circuit is made up of four diodes of D17 to D20.Voltage stabilizing circuit is made up of R19, C14, DZ13.Control circuit is made up of R20, R21, R22, R23 and SCR11.The scope of application of AC supply voltage is 100 volts to 220 volts, and frequency is 50 hertz.Instrument transformer H21 has two kinds of specifications, and the area of core section of first kind of specification is bigger, and the scope that the permission load current changes greatly can be from 50 milliamperes to 2.5 amperes, and the additional on-state voltage drop of 2 ampere-hours is 0.7 volt; The area of core section of second kind of specification is little, and the scope that allows load current to change is 1 ampere to 2.5 amperes, and the additional on-state voltage drop of 2 ampere-hours is less than 0.1 volt.Two-way main circuit current assembly uses the form of Fig. 4.During this switch operate as normal, SCR11 ends, and authigenic power supply makes VM11 and VM12 take turns forward conduction and reverse-conducting, finishes the alternating current path of major loop.When load is surpassed 2.5 ampere-hours by short circuit or load current, Output Voltage in Rectified Circuits increases, and causes the SCR11 conducting, and VM11 and VM12 forward end, and defencive function is finished in the switch disjunction.After this, in the Q1 current potential is higher than the half period of Q1 ' current potential, be under the short-circuit conditions, switch has the of short duration conducting of several microseconds; Be under the overload situations, switch has extremely several milliseconds the of short duration conducting of several microseconds.So this circuit can reset rapidly after short circuit or the removal of overload reason, resetting time is less than 20 milliseconds.

Element in Figure 31 circuit is described as follows:

H21 (first kind of specification)

L21 40 circles, 0.63 millimeter in line footpath

L22 2500 circles, 0.07 millimeter in line footpath

H21 (second kind of specification)

MX-2000 ferrite toroidal magnetic core 10 * 6 * 5

L21 3 circles, 0.80 millimeter in line footpath

L22 500 circles, 0.13 millimeter in line footpath

VM11＝VM12＝IRF740 R18＝R20＝130KΩ

SCR11＝CR02AM-1 R19＝R22＝390Ω

D17 to D20=1N4001 R21=4.7K Ω

DZ13＝2CW62 R23＝100KΩ

C14＝0.33μF

Shown in Figure 32 is an embodiment detailed circuit diagram of the third scheme of the present invention.This circuit is a TW two wire short circuit overcurrent protection switch with auto-reset function, and wherein, two-way main circuit current assembly uses the form of Fig. 8, and R24 is equivalent to the R of Figure 14, and labeled elements is not identical with the circuit of Figure 31 for remaining.Except rise the protection back alternating current in each half period switch have of short duration conducting and resetting time less than 10 milliseconds, the defencive function of this circuit is identical with the circuit of Figure 31.

Labeled elements is described as follows in Figure 32 circuit:

VM13＝IRF740 R24＝130KΩ

D2 to D24=1N5404

Shown in Figure 33 is an embodiment detailed circuit diagram of the 4th kind of scheme of the present invention.This circuit is the TW two wire protection switch that a dependence button is controlled break-make, not additional off state current when being characterized in the load outage.Because use the current stabilization assembly, so the scope of application of AC supply voltage is 25 volts to 220 volts, frequency is 50 hertz.The scope of application of load current is 1 ampere to 3 amperes.Among the figure, Q2 and Q2 ' are two splicing ears of switch.H31 is the H2 that is equivalent to Figure 15.Unidirectional current stabilization assembly is made up of D29, WC13, BG13, BG14, DZ15, R30, R31.Rectification circuit is made up of four diodes of D25 to D28.Voltage stabilizing circuit is made up of R28, DZ14, C16.Control circuit is made up of button switch K 11 and K12, R26, R27, R29, SCR12.Two-way main circuit current assembly uses the form of Fig. 1.The concrete course of work is as follows: after pressing K11, the authigenic power supply that AC power is set up by load and single-phase current stabilization assembly triggers thyristor BCR11 through R29, makes the BCR11 conducting, the load energising.After this, authigenic power supply relies on the load current among the L31 to keep, and button switch K 11 just need not be connected.After, as the need section breaker, only need click K12, authigenic power supply is promptly by short circuit, and BCR11 ends, the load outage.In the load galvanization, surpass 3 amperes as load current, the output voltage of rectification circuit increases, and after R26, R27 dividing potential drop, makes the SCR12 conducting, thereby BCR11 is ended, and finishes the overload protection process.

Element in Figure 33 circuit is described as follows:

L31 40 circles, 0.63 millimeter in line footpath

L32 800 circles, 0.13 millimeter in line footpath

BCR11＝TLC386A C15＝0.1μF

SCR12＝CR02AM-1 C16＝22μF

BG13＝D1571 R25＝100Ω

BG14＝3DA87H R26＝91KΩ

D25 to D28=1N4001 R27=4.7K Ω

D29＝1N4007 R28＝30Ω

DZ14＝2CW54 R29＝150Ω

DZ15＝2CW60 R30＝390Ω

WC13＝3DH010 R31＝100KΩ

Shown in Figure 34 is an embodiment detailed circuit diagram of the 5th kind of scheme of the present invention.This circuit is a TW two wire short circuit overcurrent protection switch with auto-reset function.Unidirectional current stabilization assembly is made up of BG15, WC14, D30, DZ16, R32.This switch is on circuit structure, and except replace the R18 in Figure 31 circuit with unidirectional current stabilization assembly, remaining composition is identical with the circuit of Figure 31.Because use unidirectional current stabilization assembly, the scope of application of the AC supply voltage of this switch is expanded as 25 volts to 220 volts, other function is identical with the circuit of Figure 31 with characteristic.

Labeled elements is described as follows in Figure 34 circuit:

BG15＝3DA87H DZ16＝2CW53

WC14＝3DH110 R32＝100KΩ

D30＝1N4007

Shown in Figure 35 is an embodiment detailed circuit diagram of the 6th kind of scheme of the present invention.This circuit is a TW two wire short circuit overcurrent protection switch with auto-reset function, and unidirectional current stabilization assembly is made up of BG16, WC15, D31, DZ16 and R33.This switch is on circuit structure, and except replace the R24 in Figure 32 circuit with unidirectional current stabilization assembly, remaining composition is identical with the circuit of Figure 32.Because use unidirectional current stabilization assembly, the scope of application of the AC supply voltage of this switch is expanded as 25 volts to 220 volts, other function is identical with the circuit of Figure 32 with characteristic.

Labeled elements is described as follows in Figure 35 circuit:

BG16＝3DA87H DZ16＝2CW53

WC15＝3DH110 R32＝100KΩ

D31＝1N4007

Shown in Figure 36 is an embodiment detailed circuit diagram of the 7th kind of scheme of the present invention.This circuit is a TW two wire temperature detect switch (TDS), and Q3 and Q3 ' are two splicing ears of switch.Load is a heater, and load current is 1 ampere.The scope of application of AC supply voltage is 150 volts to 220 volts, and frequency is 50 hertz.Instrument transformer H41 is equivalent to the H2 of Figure 18, and C17 is equivalent to the impedance Z of Figure 18, and the bridge rectifier among Figure 18 is made up of four diodes of D32 to D35.Two-way main circuit current assembly uses the form of Fig. 5.Except increasing the voltage-stabiliser tube DZ18 at rectification circuit output end, the regulator rectifier circuit of this circuit is identical with the circuit of Figure 30 with control circuit, thus the temperature control characteristic also the circuit with Figure 30 is identical.

Labeled elements is described as follows in Figure 36 circuit:

L41 40 circles, 0.50 millimeter in line footpath

L42 1000 circles, 0.130 millimeter in line footpath

BG17＝BG19＝D1571 DZ18＝2CW60

BG18＝BG20＝SDK1300 C17＝0.5μF

D32 to D35=1N4007

Shown in Figure 37 is an embodiment detailed circuit diagram of the 8th kind of scheme of the present invention.This circuit is a TW two wire temperature detect switch (TDS).Among the figure, the composition of four diodes of D40 to D43 is equivalent to the bridge rectifier among Figure 19, and unidirectional current stabilization assembly is made up of BG23, BG24, WC16, D44, DZ19, R34 and R35.Two-way main circuit current assembly uses the form of Fig. 9.Regulator rectifier circuit is identical with the circuit of Figure 36 with control circuit, thereby the temperature control characteristic of this circuit is identical with the circuit of Figure 36.Because use the current stabilization assembly, the alternating voltage scope of application of this circuit is 25 volts to 220 volts.

The labeled elements that Figure 37 circuit is is described as follows:

BG21=D1571 D40 to D44=1N4007

BG22＝SDK1300 WC16＝3DH010

BG23＝3DA87H DZ19＝2CW60

BG24＝D1571 R34＝47KΩ

D36 to D39=1N5404 R35=200 Ω

Shown in Figure 38 is an embodiment detailed circuit diagram of the 9th kind of scheme of the present invention.This circuit is a TW two wire temperature detect switch (TDS).C18 is equivalent to the impedance Z among Figure 20, and D45 and D46 are equivalent to D1 and the D2 among Figure 20.Two-way main circuit current assembly uses the form of Fig. 3.The regulator rectifier circuit of this circuit is identical with the circuit of Figure 36 with control circuit, and service condition is identical with the temperature control characteristic also circuit with Figure 36.

Labeled elements in Figure 38 circuit is described as follows:

TR12＝SP1110 C18＝1μF

D45＝D46＝1N4007

Shown in Figure 39 is an example detailed circuit diagram of the tenth kind of scheme of the present invention.This circuit is a TW two wire temperature detect switch (TDS).C19 is equivalent to the impedance Z among Figure 21, and D51 and D52 are equivalent to D1 and the D2 among Figure 21.Two-way main circuit current assembly uses the form of Fig. 7.The regulator rectifier circuit of this circuit is identical with the circuit of Figure 36 with control circuit, and service condition is identical with the temperature control characteristic also circuit with Figure 36.

The labeled elements that Figure 39 circuit is is described as follows:

SCR13＝CR3CM-12 D51＝D52＝1N4007

D47 to D50=1N5404 C19=1 μ F

Shown in Figure 40 is an embodiment detailed circuit diagram of the 11 kind of scheme of the present invention.This circuit is that a TW two wire has the contact temperature detect switch (TDS), and P2 and P2 ' are two splicing ears of switch.Load is a heater, and the scope of application of load current is 1 ampere to 3 amperes.The scope of application of AC supply voltage is 150 volts to 250 volts, and frequency is 50 hertz.Among the figure, instrument transformer H51 is equivalent to the H1 among Figure 22, and C20 is equivalent to the impedance Z among Figure 22.Regulator rectifier circuit is made up of four diodes of D53 to D56 and integrated circuit (IC) 13 and peripheral cell thereof.Control circuit is made up of IC14 and peripheral cell thereof, and wherein R38 is the slow change type negative tempperature coefficient thermistor.When R38 was cooled to 30K Ω, IC14 the 3rd pin was exported high level, made the normal opened contact closure of mechanical relay JZ11, the heater energising.When the resistance of the R38 that is heated drops to 7.5K Ω, IC14 the 3rd pin output low level, thus make the normal opened contact disjunction of JZ11, the heater outage.This switch is that the additional on-state voltage drop of 1 ampere-hour is 0.8 volt at load current.

Except that R38, other element in the circuit is described as follows:

L51 5000 circles, 0.03 millimeter in line footpath

L52 80 circles, 0.63 millimeter in line footpath

L53 1600 circles, 0.13 millimeter in line footpath

IC13＝CW7663 C22＝22μF

IC14＝LM555 C23＝0.01μF

JZ11＝NT73C-510(12VDC) R36＝820KΩ

D53 to D56=1N4001 R37=100K Ω

C20＝0.33μF R39＝15KΩ

C21＝0.047μF

Shown in Figure 41 is an embodiment detailed circuit diagram of the 12 kind of scheme of the present invention.This circuit is that a TW two wire has the contact temperature detect switch (TDS).Among the figure, form unidirectional current stabilization assembly by labeled elements.On circuit structure, except replacing the C20 with unidirectional current stabilization assembly, remaining composition is identical with the circuit of Figure 40.Owing to use the current stabilization assembly, make the scope of application of AC supply voltage expand as 25 volts to 250 volts, other service condition of this circuit is identical with the circuit of Figure 40 with the temperature control characteristic.

Labeled elements in Figure 41 circuit is described as follows:

BG25＝BG27＝3DA87H D57＝D58＝1N4007

BG26＝BG28＝D1571 R40＝R41＝100KΩ

WC17＝WC18＝3DH010 R42＝R43＝360Ω

DZ20＝DZ21＝2CW60

Shown in Figure 42 is an embodiment detailed circuit diagram of the 13 kind of scheme of the present invention.This circuit is that the TW two wire that a dependence button is controlled break-make has the contact protection switch.The scope of application of AC supply voltage is 150 volts to 250 volts, and frequency is 50 hertz.The scope of application of load current is 1 ampere to 3 amperes.Among the figure, Q4 and Q4 ' are two splicing ears of switch, and H61 is equivalent to the H2 among Figure 24, and D63 and R47 are equivalent to D and the R among Figure 24.Rectification circuit is made up of four diodes of D59 to D62.Voltage stabilizing circuit is made up of R44, DZ22, C24.Control circuit is made up of K13 and K14, R45, R46 and SCR13.The concrete course of work is as follows: after pressing K13, the authigenic power supply that AC power is set up by load and D63, R47 makes the coil electricity of mechanical relay JZ12, its normal opened contact closure, load energising.After this, authigenic power supply relies on the load current among the L61 to keep, and K13 just need not connect.After, only need click K14, load can be cut off the power supply.In the load galvanization, load current can make the SCR13 conducting if surpass 3 amperes, the coil blackout of JZ12, and the overload protection action is finished in the normal opened contact disjunction.This circuit is that the additional on-state voltage drop of 1 ampere-hour is 0.7 volt at load current.

Element in Figure 42 circuit is described as follows:

L61 80 circles, 0.71 millimeter in line footpath

L62 1600 circles, 0.13 millimeter in line footpath

JZ12＝NT73C-510(12VDC) C24＝22μF

SCR13＝CR02AM-1 R44＝51Ω

D59 to D62=1N4001 R45=120K Ω

D63＝1N4007 R46＝4.7KΩ

DZ22＝2CW60 R47＝3.6KΩ

Shown in Figure 43 is an embodiment detailed circuit diagram of the 14 kind of scheme of the present invention.This circuit is that the TW two wire that a dependence button is controlled break-make has the contact protection switch.Among the figure, labelled element is formed unidirectional current stabilization assembly.On circuit structure, except replacing D63 and the R47 with unidirectional current stabilization assembly, remaining composition is identical with the circuit of Figure 42.Owing to use the current stabilization assembly, make the scope of application of AC supply voltage expand as 25 volts to 250 volts, other service condition of this circuit is identical with the circuit of Figure 42 with protective feature.

Labeled elements in Figure 43 circuit is described as follows:

BG29＝3DA87H DZ23＝2CW60

BG30＝D1571 R48＝47KΩ

WC19＝3DH030 R49＝130Ω

D64＝1N4007

Shown in Figure 44 is an embodiment detailed circuit diagram of the 15 kind of scheme of the present invention.This circuit is that the TW two wire that a dependence button is controlled break-make has the contact protection switch.Among the figure, C25 is equivalent to the impedance Z among Figure 26, and D65 and D66 are equivalent to D1 and the D2 among Figure 26.On circuit structure, except replacing D63 and the R47 with C25, D65, D66, remaining composition is identical with the circuit of Figure 42, thereby the service condition of this circuit is identical with the protective feature also circuit with Figure 42.

Labeled elements in Figure 44 circuit is described as follows:

C25＝1μF D65＝D66＝1N4007

Shown in Figure 45 is an embodiment detailed circuit diagram of the 16 kind of scheme of the present invention.This circuit is that a TW two wire has the contact temperature detect switch (TDS).Among the figure, the parameter of instrument transformer is identical with H61, and C26 is equivalent to the impedance Z among Figure 27, and the composition of four diodes of D67 to D70 is equivalent to the bridge rectifier among Figure 27.On circuit structure, except that setting up at rectification circuit output end the voltage-stabiliser tube DZ24, the regulator rectifier circuit of this circuit, control circuit and mechanical breaker are identical with the circuit of Figure 40, thereby service condition is identical with the temperature control also circuit with Figure 40.

Labeled elements in Figure 45 circuit is described as follows:

D67 to D70=1N4007 C26=1 μ F

DZ24＝2CW62

Shown in Figure 46 is an embodiment detailed circuit diagram of the present invention's the 17 scheme.This circuit is that a TW two wire touches temperature detect switch (TDS).Among the figure, the composition of four diodes of D72 to D75 is equivalent to the bridge rectifier among Figure 28, and unidirectional current stabilization assembly is made up of BG31, BG32, WC20, D71, DZ25, R50, R51, and remaining composition is identical with the counterpart of Figure 45 circuit.Except the AC supply voltage scope of application be 25 volts to 250 volts, other service condition of this circuit is identical with the circuit of Figure 45 with the temperature control characteristic.

Labeled elements in Figure 46 circuit is described as follows:

BG31＝3DA87H DZ25＝2CW60

BG32＝D1571 R50＝47KΩ

WC20＝3DH030 R51＝150Ω

D71 to D75=1N4007

Shown in Figure 47 is another embodiment detailed circuit diagram of first kind of scheme of the present invention.This circuit is the TW two wire protection switch that a dependence button is controlled break-make, and P3 and P3 ' are two splicing ears of switch.Two-way main circuit current assembly uses the form of Figure 11, thereby the composition of this circuit belongs to the structure of Figure 29 circuit signal.The scope of application of AC supply voltage is 25 volts to 220 volts, and frequency is 50 hertz, and the scope of application of load current is 0.5 ampere to 2 amperes.The concrete course of work is as follows: after pressing K15, the two-way authigenic power supply of Jian Liing makes SCR14 and SCR15 conducting respectively simultaneously, the load energising.After this, the two-way authigenic power supply relies on the load current among the L72 to keep, and K15 just need not connect.Click K16 or load current and surpass 2 ampere-hours, the phototriode conducting among SCR13 and the LEC11, SCR14 and SCR15 end, the load outage.

Element in Figure 47 circuit is described as follows:

L71 2500 circles, 0.03 millimeter in line footpath

L72 30 circles, 0.50 millimeter in line footpath

L73 500 circles, 0.13 millimeter in line footpath

L74 500 circles, 0.13 millimeter in line footpath

SCR13＝CR02AM-1 C27＝C28＝1μF

SCR14＝SCR15＝CR3CM-12 C29＝0.1μF

BG33＝BG34＝3DA87H R52＝R53＝100KΩ

LEC11＝GD-10 R54＝R59＝510Ω

WC21＝WC22＝3DH115 R55＝120KΩ

D76＝D77＝1N4007 R56＝R57＝6.2KΩ

D78 to D85=1N4001 K58=R60=20K Ω

DZ26 to DZ29=2CW55 R61=100 Ω

Shown in Figure 48 is another embodiment detailed circuit diagram of second kind of scheme of the present invention.This circuit is a TW two wire of using in the superaudio scope protective switch of the short circuit that automatically resets, and Q5 and Q5 ' are two splicing ears of switch.AC power is 50 kilo hertzs of bi-directional square waves, and amplitude is 100 volts.The amplitude of load current is about 1 ampere.Except replacing the SCR11 with BG35 and BG36, the composition of this circuit is similar to the circuit of Figure 31, thereby short-circuit protection is also similar with the circuit of Figure 31 with the process that automatically resets, but the response time is different with resetting time.

Element in Figure 48 circuit is described as follows:

H81 MX-2000 ferrite toroidal magnetic core 10 * 6 * 5

L81 2 circles, 0.63 millimeter in line footpath

L82 60 circles, line is 0.13 millimeter (L82 adds metal screen layer) directly

VM14＝VM15＝IRF740 R62＝100KΩ

BG35＝3CG111 R63＝120KΩ

BG36＝9018 R64＝5.6KΩ

D86 to D89=1N4148 R65=R66=390 Ω

DZ30＝2CW62 R67＝100KΩ

C30＝220PF

More than the nineteen most preferred embodiment of the present invention of Jie Shaoing only is to be the basic implementation method of explanation the present invention.In fact, can pack into the control circuit of various lower power consumptions of the present invention comprises that various sensor control circuits, timing control circuit, remote control circuit are until the programme control circut of being made up of programmable controller or single-chip microcomputer.Therefore, the various variation schemes by basic structure of the present invention is drawn should be included within the claim scope.

Claims

1. an AC two-conductor switch comprises:

Be connected to two external connection terminals of the external communication active circuit that contains load; Two external connection terminals and this load are connected in series;

Two-way main circuit current assembly with two main electrodes and at least one control utmost point; The above-mentioned control utmost point is used as the conducting that drives this assembly;

Instrument transformer with first coil and second coil; Described second coil is connected on two external connection terminals by two main electrodes of two-way main circuit current assembly, so, when two-way main circuit current assembly conducting, described external communication active circuit forms operating current in load, this loaded work piece electric current flows through first coil simultaneously, like this, the loaded work piece electric current in first coil forms the alternating voltage of suitable level by the two ends that act on second coil of instrument transformer;

The rectification circuit that contains bridge rectifier; The input of this rectification circuit is connected with second coil, and the alternating voltage at the second coil two ends forms direct voltage through rectified action on the output of rectification circuit;

The voltage stabilizing circuit that contains three end direct current stabilizers and energy-storage travelling wave tube; The input of this voltage stabilizing circuit is connected with the output of above-mentioned rectification circuit, and the direct voltage on the rectification circuit output end forms metastable direct voltage through pressure stabilization function on the output of voltage stabilizing circuit;

Off-state power supply circuits; When these off-state power supply circuits end at two-way main circuit current assembly, described external communication active circuit at first makes this off-state power supply circuits energising by load, then at least by forming metastable direct voltage on the output that acts on voltage stabilizing circuit of these off-state power supply circuits itself and voltage stabilizing circuit;

The control circuit of control signal is provided; The output of this control circuit is connected with the control utmost point of described two-way main circuit current assembly, and the control signal that control circuit provides can drive this assembly conducting; And, this control circuit power end is connected with the output of described voltage stabilizing circuit, because no matter described main circuit current assembly is in conducting still end, can on the output of voltage stabilizing circuit, form metastable direct voltage, so this direct voltage is used as the power supply of control circuit.

2. an AC two-conductor switch comprises:

Mechanical relay with a normal opened contact and a drive coil; After this drive coil energising, can make described normal opened contact closure;

Instrument transformer with first coil and second coil; Described second coil is connected on two external connection terminals by the normal opened contact of mechanical relay, so, when normal opened contact is closed, described external communication active circuit forms operating current in load, this loaded work piece electric current flows through first coil simultaneously, like this, the loaded work piece electric current in first coil forms the alternating voltage of suitable level by the two ends that act on second coil of instrument transformer;

Off-state power supply circuits; These off-state power supply circuits are when the normal opened contact disjunction of mechanical relay, described external communication active circuit at first makes this off-state power supply circuits energising by load, then at least by forming metastable direct voltage on the output that acts on voltage stabilizing circuit of these off-state power supply circuits itself and voltage stabilizing circuit;

The control circuit of control voltage is provided; The output of this control circuit is connected with the drive coil of described mechanical relay, and the control voltage that control circuit provides can make the normal opened contact closure by drive coil; And, this control circuit power end is connected with the output of described voltage stabilizing circuit, because no matter to be in disjunction still closed for the normal opened contact of described mechanical relay, metastable direct voltage can be formed, so this direct voltage is used as the power supply of control circuit on the output of voltage stabilizing circuit.

3. AC two-conductor switch as claimed in claim 1 is characterized in that described two-way main circuit current assembly is a bidirectional thyristor.

4. AC two-conductor switch as claimed in claim 1, it is characterized in that described two-way main circuit current assembly is made up of a two-way photoelectricity thyristor and a luminous second tube sheet, wherein, the two ends of two-way photoelectricity thyristor are two main electrodes, one end of light-emitting diode is the control utmost point, and the other end is connected with an end of photoelectricity thyristor.

5. AC two-conductor switch as claimed in claim 1, it is characterized in that described two-way main circuit current assembly is made up of a bridge rectifier and a transistor (or thyristor), wherein, the collector electrode of transistor (or thyristor) (or drain electrode or anode) is connected with two outputs of bridge rectifier respectively with emitter (or source electrode or negative electrode), the base stage of this transistor (or thyristor) (or grid or gate pole) is the control utmost point, and two inputs of bridge rectifier are two main electrodes.

6. AC two-conductor switch as claimed in claim 1 is characterized in that described two-way main circuit current assembly also comprises the second control utmost point that is connected with another terminal of described control circuit.

7. AC two-conductor switch as claimed in claim 6, it is characterized in that described two-way main circuit current assembly is made up of a two-way photoelectricity thyristor and a light-emitting diode, wherein, the two ends of two-way photoelectricity thyristor are two main electrodes, and the two ends of light-emitting diode are respectively the control utmost point and the second control utmost point.

8. AC two-conductor switch as claimed in claim 6, it is characterized in that described two-way main circuit current assembly is made up of a bridge rectifier and a transistor (or thyristor), wherein, the collector electrode of transistor (or thyristor) (or drain electrode or anode) is connected with two outputs of bridge rectifier respectively with emitter (or source electrode or negative electrode), the base stage of this transistor (or thyristor) (or grid or gate pole) is the control utmost point, the link node of emitter (or source electrode or negative electrode) is the second control utmost point, two inputs of bridge rectifier are two main electrodes, in addition, the link node appellation start terminal of collector electrode (or drain electrode or anode).

9. AC two-conductor switch as claimed in claim 6, it is characterized in that described two-way main circuit current assembly comprises two transistors, their base stage (or grid) is connected to each other, its link node is the control utmost point, their emitter (or source electrode) is connected to each other, its link node is second control board, and their collector electrode (or drain electrode) is respectively two main electrodes.

10. as claim 1 and 2 described AC two-conductor switch, it is characterized in that described instrument transformer also comprises a tertiary coil; Described off-state power supply circuits comprise this tertiary coil and a two-way current stabilization assembly; Be connected on two external connection terminals after tertiary coil and the described two-way current stabilization assembly series connection; After tertiary coil and the energising of two-way current stabilization assembly, form the alternating voltage of suitable level by the two ends that act on second coil of instrument transformer, this alternating voltage forms metastable direct voltage by the rectified action of rectification circuit and the pressure stabilization function of voltage stabilizing circuit again on the output of voltage stabilizing circuit.

11., it is characterized in that described off-state power supply circuits comprise an impedance and first diode and second diode as claim 1,2 and 6 described AC two-conductor switch; Be connected on two external connection terminals after described impedance and the series connection of second diode, described first diode is connected between the link node of output of rectification circuit and the described impedance and second diode; After this power on circuitry, form the direct voltage of suitable level on rectification circuit output end, this direct voltage forms metastable direct voltage through the pressure stabilization function of voltage stabilizing circuit on the output of voltage stabilizing circuit.

12., it is characterized in that described off-state power supply circuits comprise a unidirectional current stabilization assembly that is connected between one of two external connection terminals and output of rectification circuit as claim 1,2 and 6 described AC two-conductor switch; After this unidirectional current stabilization assembly energising, form the direct voltage of suitable level on rectification circuit output end, this direct voltage forms metastable direct voltage through the pressure stabilization function of voltage stabilizing circuit on the output of voltage stabilizing circuit.

13. AC two-conductor switch as claimed in claim 2 is characterized in that described instrument transformer also comprises a tertiary coil; Described off-state power supply circuits comprise this tertiary coil and an impedance; Be connected on two external connection terminals after tertiary coil and the described impedance series connection; After tertiary coil and the described impedance energising, form the alternating voltage of suitable level by the two ends that act on second coil of instrument transformer, this alternating voltage forms metastable direct voltage by the rectified action of rectification circuit and the pressure stabilization function of voltage stabilizing circuit again on the output of voltage stabilizing circuit.

14. AC two-conductor switch as claimed in claim 2 is characterized in that described off-state power supply circuits comprise a resistance and diode of being connected in series that is connected between one of two external connection terminals and output of rectification circuit; After this series circuit energising, form the direct voltage of suitable level on rectification circuit output end, this direct voltage forms metastable direct voltage through the pressure stabilization function of voltage stabilizing circuit on the output of voltage stabilizing circuit.

15., it is characterized in that described off-state power supply circuits comprise a bridge rectifier and an impedance as claim 2 and 6 described AC two-conductor switch; The input of this bridge rectifier is connected on two external connection terminals by described impedance, and its output is connected to the output of rectification circuit; After this power on circuitry, form the direct voltage of suitable level on rectification circuit output end, this direct voltage forms metastable direct voltage through the pressure stabilization function of voltage stabilizing circuit on the output of voltage stabilizing circuit.

16., it is characterized in that described off-state power supply circuits comprise a bridge rectifier and a unidirectional current stabilization assembly as claim 2 and 6 described AC two-conductor switch; The input of this bridge rectifier is connected respectively on two external connection terminals, and its output is connected to the output of rectification circuit by described unidirectional current stabilization assembly; After this power on circuitry, form the direct voltage of suitable level on rectification circuit output end, this direct voltage forms metastable direct voltage through the pressure stabilization function of voltage stabilizing circuit on the output of voltage stabilizing circuit.

17. AC two-conductor switch as claimed in claim 6 is characterized in that described off-state power supply circuits comprise a resistance that is connected between one of two external connection terminals and output of rectification circuit; After this resistance energising, form the direct voltage of suitable level on rectification circuit output end, this direct voltage forms metastable direct voltage through the pressure stabilization function of voltage stabilizing circuit on the output of voltage stabilizing circuit.

18. AC two-conductor switch as claimed in claim 8 is characterized in that described off-state power supply circuits comprise a resistance that is connected between described start terminal and output of rectification circuit; After this resistance energising, form the direct voltage of suitable level on rectification circuit output end, this direct voltage forms metastable direct voltage through the pressure stabilization function of voltage stabilizing circuit on the output of voltage stabilizing circuit.

19. AC two-conductor switch as claimed in claim 8 is characterized in that described off-state power supply circuits comprise a unidirectional current stabilization assembly that is connected between described start terminal and output of rectification circuit; After this unidirectional current stabilization assembly energising, form the direct voltage of suitable level on rectification circuit output end, this direct voltage forms metastable direct voltage through the pressure stabilization function of voltage stabilizing circuit on the output of voltage stabilizing circuit.