CN101645370A

CN101645370A - Passive switch drive controller for hybrid AC contactor based on opto-coupler

Info

Publication number: CN101645370A
Application number: CN200910306608A
Authority: CN
Inventors: 刘向军; 吴功祥; 江和; 鲍光海; 张培铭
Original assignee: Fuzhou University
Current assignee: Fuzhou University
Priority date: 2009-09-04
Filing date: 2009-09-04
Publication date: 2010-02-10
Anticipated expiration: 2029-09-04
Also published as: CN101645370B

Abstract

The invention relates to a passive switch drive controller for a hybrid AC contactor based on an opto-coupler, comprising a resistor (R1), a capacitor (C1), a resistor (R2), a rectifier bridge (Z), avoltage regulator tube (W), a capacitor (C2), a resistor (R3), an opto-coupler (G3), a resistor (R4), a resistor (R5), a resistor (R6), a bidirectional thyristor (J1), a bidirectional thyristor (J2) and a bidirectional thyristor (J3). The characteristics of the thyristors are sufficiently utilized; a control circuit adopts the opto-coupler to realize separation of an excitation power supply of thecontactor and electricity of a three-phase main circuit and unifiedly provides a switch signal controlled by the opto-coupler for a three-phase bidirectional thyristor; and a power supply and a current transformer are not required for configuration specially, so that the hybrid AC contactor based on opto-coupling separation and direct drive of switch control is realized. The passive switch drivecontroller not only realizes non-arc starting and disjunction, but also has the characteristics of simple control circuit, small volume, low cost, high performance index, strong universality, safety,reliability and the like.

Description

Hybrid AC contactor passive switch driving governor based on optocoupler

Technical field

The present invention relates to a kind of hybrid AC contactor passive switch driving governor, belong to the A.C. contactor technical field based on optocoupler.

Background technology

Hybrid AC contactor has been realized no arc connection and disjunction, thereby guarantee that A.C. contactor has very high electric life, increase substantially operational reliability and performance index, the paper " novel intelligent hybrid AC contactor " that Zhang Peiming etc. delivered in the 1st phase of " low-voltage electrical apparatus " calendar year 2001, the paper that Zheng Xin etc. delivered in " low-voltage electrical apparatus " 2005 the 9th phases " research of Intelligent Hybrid formula Arcless AC Contactor ", institutes such as Zhang Peiming obtain patent " intelligent hybrid AC contactor " (patent No. ZL00242121.6) and have all introduced and adopt Single Chip Microcomputer (SCM) system that the hybrid AC contactor that adopts two or three thyristors is carried out the disconnected control of non-arc breaking, these are good schemes, but because these schemes realize Based Intelligent Control, the control system more complicated, necessary special configuration such as independent current sources such as transformer or Switching Power Supply, the excitation power supply and the main circuit of contactor are carried out the isolation of electricity, and provide control circuit required power supply, must detect main circuit current by the configuration current transformer, and the control signal of Single Chip Microcomputer (SCM) system output is connection and connecing on the control utmost point and negative electrode that puts on the thyristor in parallel with main contact routinely, make thyristor be in the wait conducting state by enough big signal volume, and Single Chip Microcomputer (SCM) system is to be respectively three-phase thyristor control signal is provided. because hybrid AC contactor control is had relatively high expectations, cause control circuit complexity and cost height, these schemes are well suited for the application scenario of having relatively high expectations, by carrying out A.C. contactor for a long time, particularly the market demand for the A.C. contactor that has a large capacity and a wide range is recognized in the research of hybrid AC contactor, not only need high level, the Intelligent Hybrid formula A.C. contactor that function is strong, more need to be suitable for the performance index such as electric life of users' needs far above common A.C. contactor, but the simple universal hybrid AC contactor of circuit, therefore the application scenario for a large amount of general A.C. contactors requires to propose the new universal controlling schemes of hybrid AC contactor, the requirement circuit is simple, cost is low, it is extremely easy to produce, volume is little, can realize that equally no arc connection and disjunction reach the control circuit of high performance index.

Summary of the invention

The purpose of this invention is to provide a kind of hybrid AC contactor passive switch driving governor based on optocoupler.

The object of the present invention is achieved like this, a kind of hybrid AC contactor passive switch driving governor based on optocoupler, comprise resistance R 1, capacitor C 1, resistance R 2, rectifier bridge Z, voltage-stabiliser tube W, capacitor C 2, resistance R 3, optocoupler G1, optocoupler G2, optocoupler G3, resistance R 4, resistance R 5, resistance R 6, bidirectional thyristor J1, bidirectional thyristor J2, bidirectional thyristor J3, it is characterized in that: the end of contactor coil excitation power supply Y meets ac contactor coil X respectively, resistance R 1 and capacitor C 1, after joining, receives the other end of the other end of resistance R 1 and capacitor C 1 end of resistance R 2 again, the other end of resistance R 2 is received the AC side of rectifier bridge Z, the other end of contactor coil excitation power supply Y and the other end of ac contactor coil X, another AC side of rectifier bridge Z is joined, the anode of rectifier bridge Z respectively with the positive pole of voltage-stabiliser tube W, the positive pole of capacitor C 2, resistance R 3 is joined, the other end of resistance R 3 is received the former limit of optocoupler G1 positive pole, optocoupler G1 former limit negative pole and the former limit of optocoupler G2 positive pole join, optocoupler G2 former limit negative pole and the former limit of optocoupler G3 positive pole join, the negative terminal of rectifier bridge Z respectively with the negative pole of voltage-stabiliser tube W, the negative pole of capacitor C 2, the former limit of optocoupler G3 negative pole joins, optocoupler G1 pay limit one end respectively with the anode of bidirectional thyristor J1, the end of the A phase main contact AX1 of A.C. contactor joins, optocoupler G1 pays the limit other end and resistance R 4 is joined, the control utmost point of the other end of resistance R 4 and bidirectional thyristor J1 joins, the negative electrode of bidirectional thyristor J1 and the A other end of main contact AX1 mutually join, two of A phase main contact AX1 terminates to A phase main circuit AX, optocoupler G2 pay limit one end respectively with the anode of bidirectional thyristor J2, the end of the B phase main contact BX1 of A.C. contactor joins, optocoupler G2 pays the limit other end and resistance R 5 is joined, the control utmost point of the other end of resistance R 5 and bidirectional thyristor J2 joins, the negative electrode of bidirectional thyristor J2 and the B other end of main contact BX1 mutually join, two of B phase main contact BX1 terminates to B phase main circuit BX, optocoupler G3 pay limit one end respectively with the anode of bidirectional thyristor J3, the end of the C phase main contact CX1 of A.C. contactor joins, optocoupler G3 pays the limit other end and resistance R 6 is joined, the control utmost point of the other end of resistance R 6 and bidirectional thyristor J3 joins, the negative electrode of bidirectional thyristor J3 and the C other end of main contact CX1 mutually join, and two of C phase main contact CX1 terminates to C phase main circuit CX.

The present invention makes full use of the characteristics of thyristor, adopt capacitance decompression, capacitance energy storage, light-coupled isolation, optocoupler is paid the control polar circuit that the limit is series at the main circuit bidirectional thyristor, control circuit only relies on optocoupler to realize the excitation power supply of contactor and the isolation of three-phase main circuit electricity, the control circuit unification provides the switching signal of optocoupler control for the three-phase bidirectional thyristor, realized the direct driving of hybrid AC contactor based on light-coupled isolation and switch control, pay the on-off action on limit and the characteristics control three-phase bidirectional thyristor of bidirectional thyristor by optocoupler, rather than with control signal connection and connecing on the control utmost point and negative electrode that puts on the bidirectional thyristor in parallel routinely with main contact, need not make bidirectional thyristor be in the wait conducting state by enough jumbo signals, wait for conducting state or off state but guarantee with the switching value signal that optocoupler is paid the limit that bidirectional thyristor is in, control circuit institute energy requirement is directly provided by excitation power supply, need not special configuration such as independent current sources such as transformer or Switching Power Supply, need not dispose current transformer and detect main circuit current, need not carry out the detection of controlled circuit phase sequence, make full use of the characteristics of thyristor, when satisfying turn-on condition, optocoupler is paid the limit and is in conducting state. and pay the limit by main circuit through optocoupler and directly drive bidirectional thyristor, automatically transfer on the main contact from bidirectional thyristor at the closed after-current of main contact, utilize the characteristics of the closed energising back pressure drop of main contact far below the bidirectional thyristor conducting voltage, automatically shut down bidirectional thyristor, the characteristics that make full use of thyristor are finished main circuit connection process, rather than rely on the shutoff control signal to turn-off bidirectional thyristor, when satisfying turn-off criterion, utilize the filter capacitor discharge to keep bidirectional thyristor and be in the wait conducting state, at the main contact opening procedure, when the bidirectional thyristor both end voltage is higher than conducting voltage, the bidirectional thyristor conducting. make electric current from main contact, transfer to bidirectional thyristor automatically, when the filter capacitor discharge electricity amount does not meet the demands, it is disconnected that optocoupler is paid the frontier juncture, bidirectional thyristor automatically shuts down, finish the main circuit interrupting process, realized that not only no arc is connected and disjunction reaches high performance index, and simplified control circuit significantly, it is simple to have circuit, cost is low, characteristics such as it is extremely easy to produce, and volume is little.

Description of drawings

Fig. 1 is the schematic block diagram of the embodiment of the invention one.

Fig. 2 is the measured waveform of the main circuit course of work current transfer of the embodiment of the invention one control.

Embodiment

Below in conjunction with drawings and Examples the present invention is described further.

As shown in Figure 1, a kind of hybrid AC contactor passive switch driving governor based on optocoupler, comprise resistance R 1, capacitor C 1, resistance R 2, rectifier bridge Z, voltage-stabiliser tube W, capacitor C 2, resistance R 3, optocoupler G1, optocoupler G2, optocoupler G3, resistance R 4, resistance R 5, resistance R 6, bidirectional thyristor J1, bidirectional thyristor J2, bidirectional thyristor J3, it is characterized in that: the end of contactor coil excitation power supply Y meets ac contactor coil X respectively, resistance R 1 and capacitor C 1, after joining, receives the other end of the other end of resistance R 1 and capacitor C 1 end of resistance R 2 again, the other end of resistance R 2 is received the AC side of rectifier bridge Z, the other end of contactor coil excitation power supply Y and the other end of ac contactor coil X, another AC side of rectifier bridge Z is joined, the anode of rectifier bridge Z respectively with the positive pole of voltage-stabiliser tube W, the positive pole of capacitor C 2, resistance R 3 is joined, the other end of resistance R 3 is received the former limit of optocoupler G1 positive pole, optocoupler G1 former limit negative pole and the former limit of optocoupler G2 positive pole join, optocoupler G2 former limit negative pole and the former limit of optocoupler G3 positive pole join, the negative terminal of rectifier bridge Z respectively with the negative pole of voltage-stabiliser tube W, the negative pole of capacitor C 2, the former limit of optocoupler G3 negative pole joins, optocoupler G1 pay limit one end respectively with the anode of bidirectional thyristor J1, the end of the A phase main contact AX1 of A.C. contactor joins, optocoupler G1 pays the limit other end and resistance R 4 is joined, the control utmost point of the other end of resistance R 4 and bidirectional thyristor J1 joins, the negative electrode of bidirectional thyristor J1 and the A other end of main contact AX1 mutually join, two of A phase main contact AX1 terminates to A phase main circuit AX, optocoupler G2 pay limit one end respectively with the anode of bidirectional thyristor J2, the end of the B phase main contact BX1 of A.C. contactor joins, optocoupler G2 pays the limit other end and resistance R 5 is joined, the control utmost point of the other end of resistance R 5 and bidirectional thyristor J2 joins, the negative electrode of bidirectional thyristor J2 and the B other end of main contact BX1 mutually join, two of B phase main contact BX1 terminates to B phase main circuit BX, optocoupler G3 pay limit one end respectively with the anode of bidirectional thyristor J3, the end of the C phase main contact CX1 of A.C. contactor joins, optocoupler G3 pays the limit other end and resistance R 6 is joined, the control utmost point of the other end of resistance R 6 and bidirectional thyristor J3 joins, the negative electrode of bidirectional thyristor J3 and the C other end of main contact CX1 mutually join, and two of C phase main contact CX1 terminates to C phase main circuit CX.

When contactor coil excitation power supply Y powers on, ac contactor coil X energising, excitation power supply is through resistance R 1 simultaneously, through rectifier bridge Z excitation power supply is become low-voltage dc voltage again after capacitor C 1 and resistance R 2 step-downs and the current limliting, this voltage is by voltage-stabiliser tube W voltage stabilizing, put on the former limit of three optocouplers after capacitor C 2 filtering again through resistance R 3 current limlitings, three optocouplers play a part to isolate and the control signal transmission, the former limit of optocoupler G1, connect with the former limit of optocoupler G3 in the former limit of optocoupler G2, three optocoupler former limit conductings, optocoupler G1 pays the limit and is in conducting state, because A phase main contact AX1 is in off-state, A phase main circuit AX voltage puts on optocoupler G1 and pays the limit, current-limiting resistance R4, the control utmost point of bidirectional thyristor J1 and the circuit of negative electrode, make bidirectional thyristor J1 conducting, A phase main circuit AX connects, because contactor coil energising back lags behind a period of time, main contact is just closed, at A phase main circuit AX after bidirectional thyristor J1 connects, A phase main contact AX1 closure, electric current is transferred on the A phase main contact AX1 from bidirectional thyristor J1, the closed energising back voltage drop of A phase main contact AX1 is very low, be not enough to keep bidirectional thyristor J1 operation, bidirectional thyristor J1 turn-offs, finish the connection process of A phase main circuit AX, B phase main circuit BX is mutually identical with A with the connection process of C phase main circuit CX.

It is when contactor coil excitation power supply Y cuts off the power supply that contactor cut-offs circuitry processes, ac contactor coil X outage, capacitor C 2 is through the former edge discharge of resistance R 3 to three optocouplers simultaneously, three optocouplers play a part to isolate and the control signal transmission, the former limit of optocoupler G1, connect with the former limit of optocoupler G3 in the former limit of optocoupler G2, three former frontier junctures of optocoupler are disconnected, optocoupler G1 pays the limit and is in off state, because this moment, A phase main contact AX1 was in closure state, and the closed energising back voltage drop of A phase main contact AX1 is very low, be not enough to keep bidirectional thyristor J1 operation, bidirectional thyristor J1 still is in off state, after A phase main contact AX1 opens, bidirectional thyristor J1 satisfies turn-on condition, electric current is transferred on the bidirectional thyristor J1 from A phase main contact AX1, when capacitor C 2 through the former edge discharge of resistance R 3 to three optocouplers, after not satisfying the optocoupler turn-on condition, it is disconnected that optocoupler G1 pays the frontier juncture, bidirectional thyristor J1 is turn-offing when keeping electric current, thereby finish the interrupting process of A phase main circuit (AX), B phase main circuit BX is mutually identical with A with the interrupting process of C phase main circuit CX.

Owing to make full use of the characteristics of thyristor, adopt capacitance decompression, capacitance energy storage, light-coupled isolation, optocoupler is paid the control polar circuit that the limit is series at the main circuit bidirectional thyristor, control circuit only relies on optocoupler to realize the excitation power supply of contactor and the isolation of three-phase main circuit electricity, the control circuit unification provides the switching signal of optocoupler control for the three-phase bidirectional thyristor, realized the direct driving of hybrid AC contactor based on light-coupled isolation and switch control, pay the on-off action on limit and the characteristics control three-phase bidirectional thyristor of bidirectional thyristor by optocoupler, rather than with control signal connection and connecing on the control utmost point and negative electrode that puts on the bidirectional thyristor in parallel routinely with main contact, need not make bidirectional thyristor be in the wait conducting state by enough jumbo signals, wait for conducting state or off state but guarantee with the switching value signal that optocoupler is paid the limit that bidirectional thyristor is in, control circuit institute energy requirement is directly provided by excitation power supply, need not special configuration such as independent current sources such as transformer or Switching Power Supply, need not dispose current transformer and detect main circuit current, need not carry out the detection of controlled circuit phase sequence, make full use of the characteristics of thyristor, when satisfying turn-on condition, optocoupler is paid the limit and is in conducting state. and pay the limit by main circuit through optocoupler and directly drive bidirectional thyristor, automatically transfer on the main contact from bidirectional thyristor at the closed after-current of main contact, utilize the characteristics of the closed energising back pressure drop of main contact far below the bidirectional thyristor conducting voltage, automatically shut down bidirectional thyristor, the characteristics that make full use of thyristor are finished main circuit connection process, rather than rely on the shutoff control signal to turn-off bidirectional thyristor, when satisfying turn-off criterion, utilize the filter capacitor discharge to keep bidirectional thyristor and be in the wait conducting state, at the main contact opening procedure, when the bidirectional thyristor both end voltage is higher than conducting voltage, the bidirectional thyristor conducting. make electric current from main contact, transfer to bidirectional thyristor automatically, when the filter capacitor discharge electricity amount does not meet the demands, it is disconnected that optocoupler is paid the frontier juncture, bidirectional thyristor automatically shuts down, finish the main circuit interrupting process, realized that not only no arc is connected and disjunction reaches high performance index, and simplified control circuit significantly, it is simple to have circuit, cost is low, characteristics such as it is extremely easy to produce, and volume is little.

Fig. 2 is based on the hybrid AC contactor passive switch driving governor of the optocoupler circuit test complete through the laboratory, realized that overall process do not have arc and connect oscillogram with disjunction, oscillogram shows hybrid AC contactor circuitry phase work overall process, waveform is the current waveform of certain phase bidirectional thyristor above among the figure, following waveform is the current waveform of certain phase main contact, when the contactor coil excitation power supply powers on, the ac contactor coil energising, because certain phase main contact is in off-state, this phase bidirectional thyristor conducting, this phase main circuit is connected, because contactor coil energising back lags behind a period of time, this phase main contact is just closed, after this phase main contact closure, electric current is transferred on this phase main contact from bidirectional thyristor, the closed energising back voltage drop of this phase main contact is very low, be not enough to keep the bidirectional thyristor operation, bidirectional thyristor turn-offs, this phase main circuit current enters running status by main contact, finish the connection process of this phase main circuit, bounce at the process of connection main contact as seen from the figure, main circuit current shifts between main contact and bidirectional thyristor, bidirectional thyristor guarantees that still the electric current of main circuit is in conducting state, it is when the contactor coil excitation power supply cuts off the power supply that contactor cut-offs circuitry processes, the ac contactor coil outage, because the closed energising back voltage drop of certain phase main contact is very low, be not enough to keep the bidirectional thyristor operation, bidirectional thyristor still is in off state, main circuit current still passes through main contact, after this phase main contact is opened, bidirectional thyristor satisfies turn-on condition, electric current is transferred on the bidirectional thyristor from this phase main contact, when electric capacity through the former edge discharge of resistance to three optocouplers, after not satisfying the optocoupler turn-on condition, it is disconnected that optocoupler is paid the frontier juncture, bidirectional thyristor is turn-offing when keeping electric current, this phase main circuit current turn-offs, thereby finishes the interrupting process of this phase main circuit.

Claims

1. hybrid AC contactor passive switch driving governor based on optocoupler, comprise resistance (R1), electric capacity (C1), resistance (R2), rectifier bridge (Z), voltage-stabiliser tube (W), electric capacity (C2), resistance (R3), optocoupler (G1), optocoupler (G2), optocoupler (G3), resistance (R4), resistance (R5), resistance (R6), bidirectional thyristor (J1), bidirectional thyristor (J2), bidirectional thyristor (J3), it is characterized in that: an end of contactor coil excitation power supply (Y) connects ac contactor coil (X) respectively, resistance (R1) and electric capacity (C1), after joining, receives the other end of the other end of resistance (R1) and electric capacity (C1) end of resistance (R2) again, the other end of resistance (R2) is received the AC side of rectifier bridge (Z), the other end of the other end of contactor coil excitation power supply (Y) and ac contactor coil (X), another AC side of rectifier bridge (Z) is joined, the anode of rectifier bridge (Z) respectively with the positive pole of voltage-stabiliser tube (W), the positive pole of electric capacity (C2), resistance (R3) joins, the other end of resistance (R3) is received the former limit of optocoupler (G1) positive pole, optocoupler (G1) former limit negative pole and the former limit of optocoupler (G2) positive pole join, optocoupler (G2) former limit negative pole and the former limit of optocoupler (G3) positive pole join, the negative terminal of rectifier bridge (Z) respectively with the negative pole of voltage-stabiliser tube (W), the negative pole of electric capacity (C2), the former limit of optocoupler (G3) negative pole joins, optocoupler (G1) Fu Bianyi end respectively with the anode of bidirectional thyristor (J1), one end of the A phase main contact (AX1) of A.C. contactor joins, optocoupler (G1) is paid the limit other end and resistance (R4) joins, the control utmost point of the other end of resistance (R4) and bidirectional thyristor (J1) joins, the negative electrode of bidirectional thyristor (J1) and the A other end of main contact (AX1) mutually join, two of A phase main contact (AX1) terminates to A phase main circuit (AX), optocoupler (G2) Fu Bianyi end respectively with the anode of bidirectional thyristor (J2), one end of the B phase main contact (BX1) of A.C. contactor joins, optocoupler (G2) is paid the limit other end and resistance (R5) joins, the control utmost point of the other end of resistance (R5) and bidirectional thyristor (J2) joins, the negative electrode of bidirectional thyristor (J2) and the B other end of main contact (BX1) mutually join, two of B phase main contact (BX1) terminates to B phase main circuit (BX), optocoupler (G3) Fu Bianyi end respectively with the anode of bidirectional thyristor (J3), one end of the C phase main contact (CX1) of A.C. contactor joins, optocoupler (G3) is paid the limit other end and resistance (R6) joins, the control utmost point of the other end of resistance (R6) and bidirectional thyristor (J3) joins, the negative electrode of bidirectional thyristor (J3) and the C other end of main contact (CX1) mutually join, and two of C phase main contact (CX1) terminates to C phase main circuit (CX).