CN2457771Y

CN2457771Y - Multifunction self control protector

Info

Publication number: CN2457771Y
Application number: CN 00225948
Authority: CN
Inventors: 赵庚
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-11-14
Filing date: 2000-11-14
Publication date: 2001-10-31
Anticipated expiration: 2010-11-14

Abstract

The utility model relates to a multifunction automatic control protector which is formed by the connection of a contactor wire wrap power supply circuit 1, a three-phase rectification power supply 2, a three-phase power supply open-phase supervisory circuit 3, a photoelectric coupling circuit 4, a three-phase load open-phase overload supervisory circuit 5, a three-phase load open-phase overload protection control circuit 6, an alarm control circuit 7 and a contactor wire wrap power supply control circuit 8. The utility model is connected with an AC contactor, a control transformer, a loudspeaker, an underwater control probe, a travel switch, etc., through an external connection end head, and the utility model can be used for the automatic control protection of pump control water level and the travel length of a hoist and can be used as a power supply main switch, etc. In addition, the utility model can carry out reliable alarming, which is especially suitable of small industrial mines and small factories with large voltage fluctuation.

Description

The multifunctional self-regulating protector

The utility model relates to a kind of automatic disconnection emergency protective circuit device that the harmful variation that departs from the normal electrical working condition is directly reacted, and specifically is meant a kind of multifunctional self-regulating protector that is specially adapted to little industrial and mineral and little workshop.

Have the emergency protective device of making class integrated protections such as phase shortage and current overload that on three-phase circuit and electromechanical equipment, uses now, though phase shortage and current overload are had protective effect really, but they can not be used as the three phase mains master switch and use, because when no-load current on the way circuit or load current are too small, it in addition also can be mistakened as and make phase shortage and produce mistake protection action so that influence the normal electricity consumption of other electric equipment on the way circuit; In addition, this type emergency protective device all is to adopt Alternating Current Power Supply to the power supply of A.C. contactor, and the mode of Alternating Current Power Supply may not used greater than ± 25% the little industrial and mineral of only paying attention to acts and efforts for expediency and territory, unskilled labourer place in starting fluctuation of pressure drop scope, because this can cause A.C. contactor to cross low normally adhesive because of supply power voltage, but be in a kind of dither state of seemingly inhaling non-suction, must have influence on motor like this can not work on normal reliable ground, make voltage ripple of power network bigger if will add the influence of external factor again, just further aggravated the appearance of this phenomenon, this just makes A.C. contactor can not be widely used in the basic reason under the big occasion of change in voltage; Also have, now a lot of phase shortage overload protective devices are the alarm free device all, even and installed warning device, also be alarm by single-phase control transformer power supply, also have only the warning reliability of 1/3rd probability when therefore open-phase fault occurring.

In view of this; in order to improve the above-mentioned bad working condition that often may occur; the purpose of this utility model; be provide a kind of can be matched to be used as the three phase mains master switch and to be particularly suitable for little industrial and mineral and the multifunctional self-regulating protector that uses the unskilled labourer field with A.C. contactor, control transformer etc., accomplish simultaneously to lack any one mutually or can both make reliable shutdown and warning during overload at three phase mains.

Referring to Fig. 1 the utility model electricity functional-block diagram, solution of the present utility model is as follows.Its circuit part is by contactor line bag power supply circuits 1; three-phase rectifier power supply 2; three phase mains phase shortage observation circuit 3; photoelectricity coupling circuit 4; threephase load phase shortage overload observation circuit 5; threephase load phase shortage overload protection control circuit 6; alarm control circuit 7 and contactor line bag power-supplying circuit 8 connect to form; wherein the power output end of three-phase rectifier power supply 2 respectively with photoelectricity coupling circuit 4; threephase load phase shortage overload observation circuit 5; threephase load phase shortage overload protection control circuit 6; the working power end of alarm control circuit 7 and contactor line bag power-supplying circuit 8 joins so that dc supply to be provided; the output of three phase mains phase shortage observation circuit 3 links to each other with the input control end of photoelectricity coupling circuit 4; the input of the output of photoelectricity coupling circuit 4 and alarm control circuit 7 joins; the output of threephase load phase shortage overload observation circuit 5 links to each other with the input of threephase load phase shortage overload protection control circuit 6; the output control terminal of threephase load phase shortage overload protection control circuit 6 and the input of alarm control circuit 7 join; another output control terminal of threephase load phase shortage overload protection control circuit 6 joins together to link to each other with the power input of contact wire bag power-supplying circuit 8 with the output control terminal of alarm control circuit 7, and the controlled end of input of the output control terminal of contactor line bag power-supplying circuit 8 and contactor line bag power supply circuits 1 joins.

The utility model with foregoing circuit structure; when dispatching from the factory, production can be assemblied in the less box body of a volume; and in box body, draw some external terminations; so that the user is matched with three-phase ac contactor, control transformer, the alarm speaker provided for oneself, the probe under water of doing water level control or the travel switch of hoist engine etc. when it is installed and used, with the usefulness of the auto-control protective of making multiple function.The external termination and the external relation of being drawn are respectively: from the

external termination

9,13,14,15 that four power inputs of contactor line bag power supply circuits 1 are drawn, they are connected with two-phase among three-phase alternating-current supply A, B, the C with the secondary of control transformer respectively; From the

external termination

16,17 that two power output ends of contactor line bag power supply circuits 1 are drawn, they join with the two ends of the line bag of A.C. contactor respectively; From the

external termination

18,19,20 that three power inputs of three-phase rectifier power supply 2 are drawn, they are connected with A, B, the C three-phase of three-phase alternating-current supply respectively; From the

external termination

10,11,12 that three power inputs of three phase mains phase shortage observation circuit 3 are drawn, they are connected with A, B, the C three-phase of three-phase alternating-current supply respectively; From the

external termination

25,26 that the output of alarm control circuit 7 is drawn, they are connected with the two ends of alarm speaker respectively; From the external termination 21 that the output earth terminal of three phase mains phase shortage observation circuit 3 is drawn, it with under water the probe in the ground connection water-level probe be connected; From the external termination 22 that the power output end of three-phase rectifier power supply 2 is drawn, from the external termination 23 that the controlled end of input of contactor line bag power-supplying circuit 8 is drawn, and from the external termination 24 that the controlled end of the input of alarm control circuit 7 is drawn, probe or travel switch are connected respectively with under water for they.Simultaneously in the lower end of three main contacts of A.C. contactor, then can insert three-phase respectively with electric loading (as motor etc.) and single-phase usefulness electric loading (as illuminating lamp etc.) by switch.

So as long as close a floodgate power supply, the power output end of three-phase rectifier power supply 2 is just supplied with foregoing circuit 4 to 8 respectively with direct-current working volts (owing to be three-phase rectifier power supply, even power supply lacks any phase, also can supply sufficient direct-current working volts).When circuit is used the electric loading access failure, three phase mains phase shortage overload protection control circuit 6 and alarm control circuit 7 all do not have phase shortage or (with) overload control signal export to contactor line bag power-supplying circuit 8, therefore this circuit 8 under the effect of the control signal of introducing from external termination 23, export to the control signal of contactor line bag power supply circuits 1 be make the power input of this circuit 1 be switched on supply voltage and electric work, so this circuit 1 output supply power voltage is given the line bag of three-phase ac contactor, make A.C. contactor get electric adhesive, thereby give the electricity consumption electric that is connected A.C. contactor 1 main contact lower end; When connecting when circuit with electric loading, as long as the generation of no phase shortage or overload fault, it is constant that above-mentioned each circuit is still kept its normal operating conditions, and three-phase ac contactor is also still kept it, and to get electric "on" position constant.

As three-phase general supply A, B, phase shortage takes place and when causing with the electric loading phase shortage in C, threephase load phase shortage overload observation circuit 5 can output phase shortage overload control signal be given threephase load phase shortage overload protection control circuit 6, make circuit 6 output control signals give contactor line bag power-supplying circuit 8, make circuit 8 output control signals give the power input of contactor line bag power supply circuits 1 again, the input supply voltage of open circuit 1, make the line bag dead electricity of three-phase ac contactor discharge, so the tripping operation of the three-phase main contact of A.C. contactor disconnects, thereby protection does not damage because of phase shortage with electric loading; Meanwhile, circuit 6 is also exported control signal and is given alarm control circuit 7, makes circuit 7 output control signals allow the alarm speaker sounding alarm, and administrative staff hasten to handle with prompting.After though the three-phase ac contactor tripping operation disconnects; the control signal that can make threephase load phase shortage overload protection control circuit 6 give contactor line bag power-supplying circuit 8 is ended; but give photoelectricity coupling circuit 4 owing to also have three phase mains phase shortage observation circuit 3 output phase shortage pilot signals this moment; this circuit 4 can send the sort signal coupling to alarm control circuit 7; not only can keep the warning of alarm speaker; also can make circuit 7 output phase shortage control signals to contact wire bag power-supplying circuit 8; so still can make three-phase ac contactor keep its tripped condition, guarantee safety with electric loading.

If three-phase general supply phase shortage is for the moment because loose contact causes, and automatic again at once contact is good and recover normal, perhaps fix a breakdown very soon, obviously, three phase mains phase shortage observation circuit 3 can stop to export the phase shortage pilot signal and give photoelectricity coupling circuit 4, make alarm control circuit 7 also can stop to export the phase shortage control signal and give contactor line bag power-supplying circuit 8 and alarm speaker, thereby contactor line bag power supply circuits 1 recover to give the power supply of three-phase ac contactor line bag again, so three-phase ac contactor recovers the power supply of closing a floodgate, loud speaker also stops to report to the police.

If open-phase fault is to occur in the later circuit in the main contact lower end of three-phase ac contactor and cause the A.C. contactor tripping operation, obviously, because the three-phase general supply of main contact upper end is phase shortage not, then three phase mains phase shortage observation circuit 3 does not have the phase shortage pilot signal and gives photoelectricity coupling circuit 4 at this moment, so alarm control circuit 7 does not just have the phase shortage control signal to give contactor line bag power-supplying circuit 8 and loud speaker yet.But because the threephase load phase shortage causes when tripping; threephase load phase shortage overload protection control circuit 6 output control signals are given contactor line bag power supply circuits 8 and alarm speaker; loud speaker is reported to the police; and this moment, the output state of circuit 6 can not automatically reset; and the power knife switch of must leaving behind; after waiting to fix a breakdown, the knife switch that could close again starts A.C. contactor work.When mechanical breakdown causes that current overload is when (surpassing set point); threephase load phase shortage overload observation circuit 5 output overloading pilot signals are given threephase load phase shortage overload protection control circuit 6; give contactor line bag power-supplying circuit 8 and loud speaker by circuit output control signal; thereby make the A.C. contactor tripping operation, make the loud speaker sounding alarm simultaneously.With probe and the matched use of travel switch under water the time, the utility model also can carry out the water level superelevation and report to the police and the stroke overload alarm.

The utlity model has following advantage and benefit: 1. it can be contained in and do the master switch use on the three phase mains, no-load current or little load current in the circuit, and it can both normally move power supply, can misoperation.2. because it gives the power supply of three-phase ac contactor line bag is to adopt the direct current supply mode; therefore it is specially adapted to use greater than ± 25% the little industrial and mineral of only paying attention to acts and efforts for expediency and territory, unskilled labourer place in starting fluctuation of pressure drop scope; in general; three-phase power line voltage is 260～500V before combined floodgate; be 80～500V behind the combined floodgate, phase shortage and overload protection are safe and reliable in the same old way.3. adopted the warning circuit of three phase rectifier power supply, so three-phase scarce any can both be reported to the police reliably mutually.4. adopted the photoelectricity coupling circuit to isolate in the three phase mains open-phase protection circuit, the control precision height does not have misoperation.

Below in conjunction with drawings and Examples the utility model is further described.

Fig. 1 is the utility model electricity functional-block diagram;

Fig. 2 is a kind of physical circuit schematic diagram of Fig. 1 block diagram;

Fig. 3 is for being fitted to the draw water electrical schematic diagram of automatic controller of a kind of mine that is used to guarantee mine safety mutually with Fig. 2 the utility model;

Referring to Fig. 1 and Fig. 2.Contactor line bag power supply circuits 1 are connected to form by diode D18 to D25 and capacitor C 9; Three-phase rectifier power supply 2 is by diode D1 to D6, and integrated voltage stabilizer IC1 and IC2, capacitor C 1 connect to form with C2 and resistance R 1; Three phase mains phase shortage observation circuit 3 is connected to form by resistance R 2 to R4, diode D7 to D10 and capacitor C 3; Photoelectricity coupling circuit 4 is connected to form with R6, voltage-stabiliser tube DW, photoelectrical coupler GD and indicator light DX1 by resistance R 5; Threephase load phase shortage overload observation circuit 5 is connected to form by triode T4 to T6, diode D11 to D16, resistance R 8 to R10, capacitor C 4 to C7 and inductance coil L1 to L6; Threephase load phase shortage overload protection control circuit 6 is connected to form with R12, potentiometer W and capacitor C 8 by triode T2, direct current relay J2, diode D17, resistance R 11; Alarm control circuit 7 is connected to form by triode T1, direct current relay J1 and resistance R 7; Contactor line bag power-supplying circuit 8 is connected to form by triode T3, direct current relay J3 and resistance R 13.

Each circuit connecting relation is achieved like this in Fig. 2 embodiment in Fig. 1 the utility model technical solution: the cathode output end of C2 joins with the moving contact of the normally closed interlock J1-1 of the line Bao Yiduan of the collector electrode of the phototriode of GD, J1 and J1 respectively, the fixed contact of J1-1 links to each other with the line Bao Yiduan of J2, and the cathode output end of C2 links to each other with the emitter-base bandgap grading of T1 to T4 respectively, like this so that dc supply to be provided; The end of the cathode output end of C3 and R5 joins, and the cathode output end of C3 links to each other with the public connecting end of GD with R6; The emitter-base bandgap grading and the R7 of the phototriode of GD join; The negative pole public connecting end of D14 to D16 links to each other with the medial head of W, and the end of the collector electrode of T6 and W joins; The negative pole of D17 links to each other with the fixed contact of the normally open contact J1-2 of J1; The fixed contact of the normally closed interlock J1-1 of J1 links to each other with the moving contact of the normally closed interlock J2-1 of J2, and the fixed contact of the normally closed interlock J2-1 of J2 and the line Bao Yiduan of J3 join; The end of the normally open contact J3-1 of J3 and the end of R3 join, and the other end of J3-1 links to each other with the anodal public connecting end with the D23 negative pole of D19.

Corresponding with Fig. 1, the external termination of drawing among Fig. 2 embodiment is respectively: from the anodal external termination 9 of drawing with the tie point of D22 negative pole of D18, from the anodal external termination 13 of drawing of D19 with the tie point of 23 negative poles, from the anodal external termination 14 of drawing of D21, from the anodal external termination 15 of drawing of D20 with the tie point of D24 negative pole with the tie point of D25 negative pole; From the anodal external termination 16 of drawing of D22 to D25, from the external termination 17 that the points of common connection of D18 to the D21 negative pole and the C9 other end is drawn with the points of common connection of C9 one end; From the anodal external termination 18 of drawing of D1, from the anodal external termination 19 of drawing of D2, from the anodal external termination 20 of drawing of D3 with the tie point of D6 negative pole with the tie point of D5 negative pole with the tie point of D4 negative pole; From the

external termination

10,11,12 that resistance R 2, R3, R4 one end are drawn respectively; From the external termination 25 that the C2 cathode output end is drawn, from the external termination 26 that the tie point of the fixed contact of D17 negative pole and normally open contact J1-2 is drawn; From the anodal external termination 21 of drawing of D8 with the ground connection tie point of D10 negative pole; From the

external termination

22,23,24 that resistance R 1, R13, R7 one end are drawn respectively.

In Fig. 2 embodiment, the model of IC1 and IC2 adopts 7818 and 7812 respectively.

In Application Example shown in Figure 3, the utility model by its external termination 9～26 respectively with A.C. contactor CJ1, control transformer BK1 with BK2, loud speaker YD, pop one's head in and 27～30 etc. be connected under water.Behind close knife switch K1 and K2, three phase mains A, B, C connect, BK2 gets electric work, make D1 to D6 get electric rectification, after filtering and voltage stabilizing, the C2 two ends just provide line bag and the T1 to T3 of direct-current working volts to GD, J1 to J3, end because of T1, T2 this moment, so J1, J2 are in release condition, J1-1 and J2-1 are closed, and J3-1 disconnects.When water level rise to reach water level control probe 27 bottoms after, the T3 base potential rises, the e of T3, the conducting of c interpolar, J3 gets electric adhesive, the J3-1 closure, make A, B phase power supply is given D18, D19, D22 and D23 commutation supply voltage, the output winding of BK1 is given D20 simultaneously, D21, D24, the power supply of D25 rectification circuit, so output commutating voltage in C9 two ends is given the line bag of CJ1, make the CJ1 adhesive, its main contact CJ1-1, CJ1-2, the closed conducting of CJ1-3, in the moment of CJ1 adhesive, its normally closed interlock CJ1-4 disconnects, and makes D18, D19, the power supply of D22 and D23 rectification circuit is cut off, so main straightening stream proceed-to-send, only by D20, D21, D24 and the power supply of D25 rectification circuit, keep the sticking of CJ1, thus A, B, the C three phase mains passes through CJ1-1, CJ1-2, CJ1-3 and K2 water supply pump motor M power supply are drawn water pump working.Therefore in the CJ1 adhesive, normally open contact CJ1-5 closure even water pump draws water when making water level drop to leave water level control probe 27 bottoms, also can provide high potential for the base stage of T3 by ground connection water-level probe 28, with the conducting of maintenance T3 and the adhesive of J3.Water level constantly descends along with drawing water of water pump, when water level is brought down below down water level control probe 29 lower ends, the T3 base potential descends, its e, c interpolar end, and the J3 dead electricity discharges, and J3-1 disconnects, the CJ1 dead electricity discharges, CJ1-1, CJ1-2, CJ1-3 disconnect, and stop water supply pump motor M power supply, and water pump stops pumping.When the CJ1 dead electricity discharges, CJ1-5 disconnects, therefore even water level rises naturally and touches down water level and control and pop one's head in 29, can not high potential be provided for the base stage of T3 by water-level probe 28, therefore water pump stops pumping always, wait until water level rise naturally arrive to go up water-level probe 27 bottoms after, just can restart water pump and draw water.Like this, along with the rising and the decline of water level, the water pump just work of rotating again and again draws water and stops pumping.When causing the uppermost alarm water level of water level rising arrival to pop one's head in 30 bottoms in the presence of working line, water pump, motor etc. break down, the T1 base stage gets, make e, the conducting of c interpolar of T1, J1 gets electric adhesive, the J1-1 closure, DC power supply offers alarm speaker YD sounding alarm through

external termination

25 and 26, in time handles with notice well face staff.

As A, B, when phase shortage does not take place the C three phase mains, be contained in voltage that L1～L6 produced on the threephase load line and the electric current major part after rectification e, the c utmost point by the T4～T6 that connecting and flow back to the dc power cathode end, and have only fraction to enter the T2 base stage by W, but when electric current does not surpass set point (set point is set up by W), J2 is failure to actuate, the W of this moment as big capacity charging, has time-lag action as current limliting and C8, closes a floodgate to guarantee normal starting and to continue.But when causing the motor M phase-deficient operation when three phase mains generation phase shortage, L4～L6 one dead electricity, cause T4～T6 its-can not conducting between e, c, the voltage commutation electric current that L1～L3 forms all enters the T2 base stage and surpasses set point (DX2 is bright) by W, makes the T2 base potential raise and conducting between e, c, so J2 gets electric adhesive, J2-1 disconnects and the J2-2 closure, and the J3 dead electricity is discharged, and J3-1 disconnects, thereby force the CJ1 tripping operation, M is not burnt out with the water conservation pump motor.Meanwhile, DC power supply is connected loud speaker YD warning.Though CJ1 tripping operation back can make L1～L3 electric current that all loses induction, J2 again can dead electricity discharges and makes the J2-1 closure, but since this moment D7～D10 also electric work (DX1 is bright), after the GD coupling, make the T1 conducting and J1 gets electric adhesive, J1-1 disconnects and the J1-2 closure remains the direct current supply of having cut off J3 line bag and T3 and the tripping operation of keeping CJ1, and keeps YD and continue to report to the police.

When phase shortage is that loose contact causes, neglect again contact automatically and well or fix a breakdown, D7～D10 dead electricity then, J1 recovers the dead electricity release condition, T2 recover again by and T3 recovers conducting, J3 recover electric attracting state, the CJ1 adhesive, motor M is reset work.When mechanical breakdown causes that current overload is when (surpassing set point); L1～L3 exports big electric current and give the T2 base stage after rectification; make c, the conducting of e interpolar of T2; J2 gets electric adhesive; J2-1 disconnects and the J2-2 closure, so the J3 dead electricity is discharged, causes the CJ1 tripping operation; with the protection motor M, the closure owing to J2-2 is reported to the police loud speaker YD simultaneously.Because of J1 does not move, the J2 action can not reset, and must leave behind knife switch K1 and K2 close a switch after fixing a breakdown again again.When phase shortage occurs in the later circuit in main contact CJ1-1, CJ1-2, the CJ1-3 lower end of contactor CJ1, it is the same to catch up with the CJ1 tripping operation of stating the mechanical breakdown initiation, and because of the action of J1 end, J2 moves and can not reset, must leave behind knife switch K1 and K2 close a switch after fixing a breakdown again.

When Fig. 2 the utility model was used as the battery main switch use, only

external termination

22 and 23 need be joined got final product.As Fig. 3 Application Example, Fig. 2 the utility model also can be matched with A.C. contactor, control transformer, alarm speaker, travel switch etc. by its external termination 9～26, as the auto-control protective of hoist engine stroke safety.

Claims

1; a kind of multifunctional self-regulating protector; it is characterized in that; its circuit part is by contactor line bag power supply circuits (1); three-phase rectifier power supply (2); three phase mains phase shortage observation circuit (3); photoelectricity coupling circuit (4); threephase load phase shortage overload observation circuit (5); threephase load phase shortage overload protection control circuit (6); alarm control circuit (7) and contactor line bag power-supplying circuit (8) connect to form; wherein the source output terminal of three-phase rectifier power supply (2) respectively with photoelectricity coupling circuit (4); threephase load phase shortage overload observation circuit (5); threephase load phase shortage overload protection control circuit (6); the working power end of alarm control circuit (7) and contactor line bag power-supplying circuit (8) joins so that dc supply to be provided; the output of three phase mains phase shortage observation circuit (3) links to each other with the input control end of photoelectricity coupling circuit (4); the input of the output of photoelectricity coupling circuit (4) and alarm control circuit (7) joins; the output of threephase load phase shortage overload observation circuit (5) links to each other with the input of threephase load phase shortage overload protection control circuit (6); the input of the output control terminal of threephase load phase shortage overload protection control circuit (6) and alarm control circuit (7) joins; another output control terminal of threephase load phase shortage overload protection control circuit (6) joins together to link to each other with the power input of contact wire bag power-supplying circuit (8) with the output control terminal of alarm control circuit (7), and the controlled end of input of the output control terminal of contactor line bag power-supplying circuit (8) and contactor line bag power supply circuits (1) joins.

2, multifunctional self-regulating protector according to claim 1 is characterized in that, contactor line bag power supply circuits (1) are connected to form by diode D18 to D25 and capacitor C 9; Three-phase rectifier power supply (2) is by diode D1 to D6, and integrated voltage stabilizer IC1 and IC2, capacitor C 1 connect to form with C2 and resistance R 1; Three phase mains phase shortage observation circuit (3) is connected to form by resistance R 2 to R4, diode D7 to D10 and capacitor C 3; Photoelectricity coupling circuit (4) is connected to form with R6, voltage-stabiliser tube DW, photoelectrical coupler GD and indicator light DX1 by resistance R 5; Threephase load phase shortage overload observation circuit (5) is connected to form by triode T4 to T6, diode D11 to D16, resistance R 8 to R10, capacitor C 4 to C7 and inductance coil L1 to L6; Threephase load phase shortage overload protection control circuit (6) is connected to form with R12, potentiometer W and capacitor C 8 by triode T2, direct current relay J2, diode D17, resistance R 11; Alarm control circuit (7) is connected to form by triode T1, direct current relay J1 and resistance R 7; Contactor line bag power-supplying circuit (8) is connected to form by triode T3, direct current relay J3 and resistance R 13; The cathode output end of C2 joins with the moving contact of the normally closed interlock J1-1 of the line Bao Yiduan of the collector electrode of the phototriode of GD, J1 and J1 respectively, the fixed contact of J1-1 links to each other with the line Bao Yiduan of J2, and the cathode output end of C2 links to each other with the emitter-base bandgap grading of T1 to T4 respectively, like this so that dc supply to be provided; The end of the cathode output end of C3 and R5 joins, and the cathode output end of C3 links to each other with the public connecting end of GD with R6; The emitter-base bandgap grading and the R7 of the phototriode of GD join; The negative pole public connecting end of D14 to D16 links to each other with the medial head of W, and the end of the collector electrode of T6 and W joins; The negative pole of D17 links to each other with the fixed contact of the normally open contact J1-2 of J1; The fixed contact of the normally closed interlock J1-1 of J1 links to each other with the moving contact of the normally closed interlock J2-1 of J2, and the fixed contact of the normally closed interlock J2-1 of J2 and the line Bao Yiduan of J3 join; The end of the normally open contact J3-1 of J3 and the end of R3 join, and the other end of J3-1 links to each other with the anodal public connecting end with the D23 negative pole of D19.