The control system that is used for the high speed thyristor tandem working
Technical field
The invention belongs to the semiconductor switch technical field in the solid state pulse power supply, be specifically related to a kind of control system that is used for the high speed thyristor tandem working.
Background technology
Along with the continuous progress of semiconductor switch in the field of power electronics manufacturing technology, the power type semiconductor switch, as thyristor class switch, IGBT etc., singly be not applied to electric power system, and be applied in the pulse power field gradually, the stability of semiconductor switch, easily the property controlled and long-life are its important prerequisites that gains a place in the pulse power field.At present, in the solid state pulse power source of uses such as some positive and negative particle colliders, High-Power Microwave generation device, industrial flaw detection, accelerator irradiation, impulse electric corona plasma flue gas processing device, all adopted semiconductor switch.For this reason, some semiconductor switch manufacturers, also developed the semiconductor switch (as the 5SPY series semiconductor switch that ABB AB produces, the T102 type static induction thyristor that NGK company produces) of high-power, the high voltage that is specifically designed to the pulse power field, big electric current as Sweden ABB, Japanese NGK etc.But be limited to the withstand voltage relatively low characteristics of semiconductor switch, adopt series connection or series-parallel mode during use mostly.
High speed thyristor (FST, Fast switching thyristor) is a kind of of semiconductor switch, and the production technology maturation of high speed thyristor, output are big, cost is lower, and the withstand voltage 3kV of reaching as high as of its single tube, on-state average current reach 2500A at present.
Because FST generally is applied to the frequency converter field, not doing series connection uses, the normal thyristor trigger module control FST work of using single-phase or three-phase of people, but this generic module or existing other FST control can't be applied to the work that many FST connect with triggering system, have limited the application of FST as pulse power discharge switch.
Summary of the invention
The purpose of this invention is to provide a kind of control system that is used for the high speed thyristor tandem working, make the high speed thyristor of series connection can be used as the discharge switch of solid state pulse power supply.
The present invention is used for the control system of high speed thyristor tandem working, comprises control section and protection part, and control section is connected with the high speed thyristor of tandem working respectively with the protection part.
The control section of control system of the present invention comprises control circuit and circuits for triggering, and control circuit is connected with circuits for triggering by optical fiber; Control circuit comprises the 12V direct current supply line, the repeated trigger control circuit, the single trigger control circuit, control signal converting circuit, trigger delay adjustment circuit, optically-controlled signal produces circuit, the 12V direct current supply line respectively with the repeated trigger control circuit, the single trigger control circuit, control signal converting circuit, optically-controlled signal produces circuit and is connected, separate repeated trigger control circuit, the single trigger control circuit then is connected with control signal converting circuit simultaneously, control signal converting circuit produces circuit with optically-controlled signal again and is connected, and optically-controlled signal produces circuit and by optical fiber signal passed to circuits for triggering; Circuits for triggering comprise isolating transformer, 6V, 12V direct current supply line, triggering signal output circuit, and isolating transformer is connected with 6V, 12V direct current supply line, and 6V, 12V direct current supply line are connected with the triggering signal output circuit again.
The protection of control system of the present invention partly comprises static state voltage equipoise circuit, RCD protective circuit, and the static state voltage equipoise circuit is connected with the RCD protective circuit.
The control section course of work of control system of the present invention is: after control circuit is connected the 220V electric main, the work of the output 12V of supply line DC driven control circuit, it is single work or repetition rate work that control circuit can realize regulating the high speed thyristor tandem working, respectively by single trigger control circuit or repeated trigger control circuit output control signal, control signal controlled signal change-over circuit is converted to level signal as the input signal that triggers delay adjustment circuit, open the parameter of time-delay according to each high speed thyristor, the output time that triggers delay adjustment circuit adjusting optically-controlled signal is poor, produces circuit by optically-controlled signal again and by optical fiber control signal is passed to circuits for triggering; The quantity of circuits for triggering is identical with the quantity of high speed thyristor, after circuits for triggering are connected the 220V electric main, the output 6V of supply line, the work of 12V DC driven circuits for triggering, after circuits for triggering optical fiber receiving terminal receives the optically-controlled signal of control circuit output, the triggering signal output circuit produces triggering signal, and deliver to the high speed thyristor gate pole, it is open-minded to trigger each high speed thyristor.
The quantity of RCD protective circuit is identical with the quantity of high speed thyristor in the protection part of control system of the present invention, and the static state voltage equipoise circuit adopts grading resistor, reaches static state voltage equipoise when making the high speed thyristor tandem working; The RCD protective circuit comprises diode, protection electric capacity, absorption resistance, consumes the energy of the pulse spike that occurs in the high speed thyristor tandem working process, the amplitude of restriction peak voltage.
The 220V electric main is adopted in the power supply of control system of the present invention.
Adopt control system of the present invention, can realize the tandem working of many high speed thyristors; Can export the adjustable triggering signal of time-delay according to the time difference that each pipe in the series connection high speed thyristor is opened, realize the consistent open-minded of series connection high speed thyristor; Can realize the single operation and repetition rate operation of high speed thyristor tandem working; Static state and the dynamic voltage balancing, prevention high speed thyristor of high speed thyristor before and after opening of can realizing connecting flows into reverse current and effectively eliminates or peak voltage that restriction high speed thyristor two ends occur in opening process, guarantees safety, the steady operation of each high speed thyristor.
Description of drawings
Fig. 1 is the structural representation that the present invention is used for the control system of high speed thyristor tandem working.
Fig. 2 is the structural representation of the control section of control system of the present invention.
Fig. 3 is the structural representation of control circuit in the control section of control system of the present invention.
Fig. 4 is the structural representation of circuits for triggering in the control section of control system of the present invention.
Fig. 5 is the structural representation of the protection part of control system of the present invention.
Fig. 6 is the circuit theory diagrams of solid state pulse power supply that adopt the embodiment of control system of the present invention.
Fig. 7 is the circuit theory diagrams of repeated trigger control circuit in the control circuit of control section of control system of the present invention.
Fig. 8 is the circuit theory diagrams of single trigger control circuit in the control circuit of control section of control system of the present invention.
Fig. 9 is the circuit theory diagrams of control signal converting circuit in the control circuit of control section of control system of the present invention.
Figure 10 is the circuit theory diagrams that trigger delay adjustment circuit in the control circuit of control section of control system of the present invention.
Figure 11 is the circuit theory diagrams that optically-controlled signal produces circuit in the control circuit of control section of control system of the present invention.
Figure 12 is the circuit theory diagrams of triggering signal output circuit in the circuits for triggering of control section of control system of the present invention.
Figure 13 all presses in the protection part of control system of the present invention and the circuit theory diagrams of RCD protective circuit.
Figure 14 is the structural representation of the embodiment of control system of the present invention.
Figure 15 is the anode voltage waveform figure that adopts each high speed thyristor of connecting in the solid state pulse power supply of embodiment of control system of the present invention.
Figure 16 is the turning-on voltage oscillogram that adopts the high speed thyristor of connecting in the solid state pulse power supply of embodiment of control system of the present invention.
In Fig. 1~5, control section 1, the high speed thyristor 2 of series connection, protection part 3; control circuit 4, circuits for triggering 5, optical fiber 6; 12V supply line 7, repeated trigger control circuit 8, single trigger control circuit 9; control signal converting circuit 10 triggers delay adjustment circuit 11, and optically-controlled signal produces circuit 12; isolating transformer 13,6V, 12V direct current supply line 14, triggering signal output circuit 15; protection part 3, equalizer circuit 16, RCD protective circuit 17.
Among Fig. 6, DC power supply 18, filtering energy storage capacitor 19, high voltage induction 20, high voltage silicon stack 21, high voltage induction 22, energy storage capacitor 23, saturable pulse transformer 24, pulse capacitor 26, pulse capacitor 25, magnetic switch 27, load 28, high voltage silicon stack 29, magnetic switch reset power 30.
In Fig. 7~13, metalfilmresistor (R1~R6, R8~R16, R21~R31), wire resistor (R32, R34), cement resistor R33, adjustable potentiometer (R7, R17~R20), ceramic disc capacitor (C1~C10), high pressure CBB electric capacity (C11, C12), 555 timer (T1, T3), LM339N chip T2, LM393 chip T4, the binding post (JP1 of two-way output, JP2, JP3), optic fibre input end LD1, optical fiber receiving terminal LRD1, triode (Q1, Q2, Q3), fast recovery diode (D1, D2), high-frequency diode D3, push-button switch U1, the two switch U2, output interface (Port1 of putting of hilted broadsword, Port2, Port5, Port7~10, Port12~15), input interface (Port3, Port4, Port6, Port11).
Among Figure 14, trigger delay adjustment circuit (11-1,11-2), and optically-controlled signal generation circuit (12-1~12-8), the triggering signal output circuit (15-1~15-8), the RCD protective circuit (17-1~17-8), the high speed thyristor of series connection (FST-1~FST-8); Solid arrow is represented the signal of telecommunication, and empty arrow is represented light signal.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the structural representation that the present invention is used for the control system of high speed thyristor tandem working, and control system of the present invention comprises control section 1 and protection part 3; Control section 1 is connected with the high speed thyristor 2 of series connection respectively with protection part 3, and arrow is represented the signal input.
Fig. 2 is the structural representation of the control section of control system of the present invention, and control section 1 comprises control circuit 4 and circuits for triggering 5, and control circuit 4 is connected with circuits for triggering 5 by optical fiber 6.
Fig. 3 is the structural representation of control circuit in the control section of control system of the present invention, and control circuit 4 comprises 12V direct current supply line 7, repeated trigger control circuit 8, single trigger control circuit 9, control signal converting circuit 10, triggers delay adjustment circuit 11, optically-controlled signal produces circuit 12; 12V direct current supply line 7 in the control circuit 4 produces circuit 12 with repeated trigger control circuit 8, single trigger control circuit 9, control signal converting circuit 10, optically-controlled signal respectively and is connected, separate repeated trigger control circuit 8,9 whiles of single trigger control circuit are connected with control signal converting circuit 10, control signal converting circuit 10 produces circuit 12 with optically-controlled signal again and is connected, and optically-controlled signal produces circuit 12 and is connected with triggering signal output circuit 15 in the circuits for triggering 5 by optical fiber 6.
Fig. 4 is the structural representation of circuits for triggering in the control section of control system of the present invention, and circuits for triggering 5 comprise isolating transformer 13,6V, 12V direct current supply line 14, triggering signal output circuit 15; Isolating transformer 13 in the circuits for triggering 5 is connected with 6V, 12V direct current supply line 14, and 6V, 12V direct current supply line 14 are connected with triggering signal output circuit 15 again.
Fig. 5 is the structural representation of the protection part of control system of the present invention, and protection part 3 comprises static state voltage equipoise circuit 16, RCD protective circuit 17, and static state voltage equipoise circuit 16 is connected with RCD protective circuit 17.
Fig. 6 is the solid state pulse power supply that adopts control system of the present invention, and the solid state pulse power supply adopts eight high speed thyristor series connection as discharge switch.DC power supply 18 is by energy storage filtering capacitor 19, high voltage induction 20,21 pairs of energy storage capacitor 23 resonant chargings of high voltage silicon stack; After charging finished, the high speed thyristor 2 of eight series connection was open-minded, energy storage capacitor 23 discharges, 25,26 chargings of paired pulses capacitor; When energy storage capacitor 23 discharges finished, the iron core of saturable pulse transformer 24 entered saturation condition, magnetizing inductance rapid drawdown, and pulse capacitor 26 begins to swing to discharge in saturable pulse transformer 24 secondary loops, and magnetic switch 27 both end voltage raise rapidly; Pulse capacitor 26 voltages are swung to when finishing, and magnetic switch 27 reaches capacity, and pulse capacitor 25,26 series connection form high-voltage pulse to load 28 discharges.
Figure 14 is the structural representation of the embodiment of control system of the present invention.The embodiment of control system of the present invention comprises repeated trigger control circuit 8, single trigger control circuit 9, control signal converting circuit 10, triggers delay adjustment circuit (11-1,11-2), optically-controlled signal generation circuit (12-1~12-8), triggering signal output circuit (15-1~15-8), equalizer circuit 16 and RCD protective circuit (17-1~17~8).
Fig. 7~12 are the circuit theory diagrams of each unit of control system of the present invention.
Structural representation in conjunction with embodiment among Figure 14, the connected mode of the circuit interface of each element circuit is: output interface (Port1, Port2) connect input interface (Port3 respectively, Port4), output interface Port5 output two paths of signals connects two groups of input interface Port6, two groups of output interface (Port7, Port8, Port9, Port10) connect eight groups of input interface Port11 respectively, eight groups of output interface Port12 connect the gate pole of eight high speed thyristors, eight groups of output interface Port13 connect the negative electrode of eight high speed thyristors, eight groups of output interface Port14 connect the anode of eight high speed thyristors, and eight groups of output interface Port15 connect the negative electrode of eight high speed thyristors.
The circuit working principle of the control section of the embodiment of control system of the present invention is: the binding post JP1 of two-way output connects adjustable potentiometer in the repetition rate trigger control circuit 9, be used to regulate 555 timer T1 and trigger the charging interval that input (No. 2 pins) is located capacitor C 1, change the discharge time of C1 by the discharge end (No. 7 pins) of T1, and then the cycle of change T1 input pulse, regulate the output frequency of trigger impulse, the reset terminal of T1 (No. 4 pins) and power input (No. 8 pins) connect the 12V DC power supply, capacitor C 2, C3 is with No. 2 of T1, No. 5 and No. 6 pins are isolated with ground, the binding post JP2 of two-way output connects frequency and shows, the output connecting resistance R4 of T1, capacitor C 5, resistance R 8 and adjustable potentiometer R7, C5, R8, R7 forms differential circuit, when T1 output positive pulse, electric current by capacitor C 5 is bigger, form fast pulse voltage at R8 and R7 two ends, the input interface Port3 of output signal switch U2 in the control signal converting circuit 10, R7 is used for adjusting pulse duration and steepness, and capacitor C 4 is an output filter capacitor; When switch U1 did not open in the single trigger control circuit 9, capacitor C 6 was by power source charges, and after U1 opened, C6 was by resistance R 10 discharges, the input interface Port4 of output signal switch U2 in the control signal converting circuit 10; Switch U2 selects one road signal to input to triode Q1 base stage, and it is open-minded to trigger Q1, and the Q1 collector voltage descends, and triode Q2 ends, and the 12V DC power supply is by 7 chargings of 15 pairs of capacitor C of resistance R; The C7 voltage signal inputs to two groups of input interface Port6, every group of input interface Port6 connects four negative input ends (No. 4, No. 6, No. 8 with No. 10 pins) of a comparator LM339N, and the current potential of four positive input terminals of LM339N (No. 5, No. 7, No. 9 with No. 11 pins) is controlled by adjustable potentiometer (R17, R18, R19, R20); Eight road input signals output signal to the input interface Port11 of eight group of 555 timer T2 after relatively respectively through LM339N, when input signal is low level, T2 output high level signal is to optic fibre input end LD1, optical fiber begins to transmit the light pulse control signal, when the T2 input signal was high level, optical fiber is transmission signals not; After eight groups of optical fiber receiving terminal LRD1 receive light pulse signal, the pulse of LM393 comparator output low level, trigger triode Q3 conducting, to the high speed thyristor gate pole, high speed thyristor is open-minded by differential circuit output trigger impulse for the 6V DC power supply; The C7 charging arrives the time that the time of comparing potential point has determined the T2 input low level, thereby can realize that eight high speed thyristor unanimities are open-minded according to the comparison current potential that each group input among the LM339N is regulated in time-delay of opening of each high speed thyristor.
Figure 13 all presses in the protection part of control system of the present invention and the circuit theory diagrams of RCD protective circuit.
In conjunction with the structural representation of embodiment among Figure 14, the annexation of the circuit interface of protective circuit is: eight groups of output interfaces (port14, port15) connect anode, the negative electrode of eight high speed thyristors respectively.
The protection partial circuit operation principle of the embodiment of control system of the present invention is: when high speed thyristor was in off state, grading resistor R34 was used for the off-state of high speed thyristor and all presses; Electric capacity (C11, C12) is charged to the voltage identical with the high speed thyristor of being protected; When high speed thyristor is opened, electric capacity (C11, C12) is by resistance R 32 and high speed thyristor discharge, when high speed thyristor turn-offs, electric capacity (C11, C12) when voltage is opened to high speed thyristor pressure drop similar, then power supply need charge by diode D2,33 pairs of electric capacity of resistance R (C11, C12), thereby the voltage when having limited high speed thyristor and turn-offing rises rapidly, utilize characteristic that electric capacity (C11, C12) voltage can not suddenly change high speed thyristor open and turn off process in play pressure stabilization function; R33, C11, C12 also are used for filtering the low frequency of high speed thyristor two ends appearance, the peak voltage of the higher-order of oscillation; Backward diode D3 plays the function of afterflow, prevents to flow through when high speed thyristor from not turn-offing reverse current.
As seen from Figure 15, adopt control system of the present invention to control, the high speed thyristor of eight series connection is when withstand voltage 10kV, in opening process, realized that off-state all presses, and anode voltage decline is more consistent in the opening process, and curve is comparatively level and smooth, has realized that the high speed thyristor unanimity of eight series connection is open-minded.
As seen from Figure 16, adopt control system of the present invention to control, after the high speed thyristor of eight series connection is opened, not having obvious peaking voltage occurs, illustrate that then control system of the present invention has guaranteed that eight high speed thyristors are consistent open-minded under withstand voltage 10kV, and guaranteed the stable of high speed thyristor series voltage in the opening process, make the work of series connection high speed thyristor safety and stability.
Adopt the solid state pulse power supply of the embodiment of control system of the present invention to export the pulse voltage of peak value 37.5kV, forward position 480ns, pulsewidth 1.05 μ s under repetition rate 100Hz, power output 3kW is used for that VOCs handles and the desulphurization denitration test of little exhaust gas volumn.
The present invention also is applicable to the situation greater or less than eight high speed thyristor tandem workings, according to the quantity of high speed thyristor, adopts triggering delay adjustment circuit, optically-controlled signal generation circuit, triggering signal output circuit, the RCD protective circuit of respective numbers.