CN102545660B - Phase sequence self-adaption trigger circuit of three-phase fully-controlled rectifier induction heating power supply - Google Patents

Abstract

The invention belongs to the field of electrical technology and discloses a phase sequence self-adaption trigger circuit of a three-phase fully-controlled rectifier induction heating power supply. The phase sequence self-adaption trigger circuit is connected in series between a three-phase alternate current and a three-phase full-bridge thyristor drive axle and mainly comprises a phase sequence judging circuit, a three-phase synchronous signal additional phase shifting and phase sequence gating circuit, a thyristor three-phase trigger pulse phase shifting circuit and a three-phase trigger phase gating and output circuit. After a three-phase switching-in phase sequence of the induction heating power supply is judged by the phase sequence judging circuit, a suitable three-phase rectifier trigger pulse is generated by the three-phase synchronous signal additional phase shifting and phase sequence gating circuit and is sent into the thyristor three-phase trigger pulse phase shifting circuit to generate phase shifting; and the three-phase rectifier trigger pulse which is subjected to phase shifting is sent to the three-phase trigger phase gating and output circuit to drive a thyristor of the three-phase full-bridge thyristor drive axle. According to the invention, the random switching-in of a line sequence of three phases of the induction heating power supply is implemented and the phase sequence self-adaption trigger circuit has the characteristics of simple structure and low cost.

Description

The phase sequence self-adaption circuits for triggering of three-phase fully-controlled rectification induction heating power

Technical field

The invention belongs to technical field of electricity, relate to a kind of start-up technique of induction heating power, be specifically related to a kind of phase sequence self-adaption circuits for triggering of three-phase fully-controlled rectification induction heating power.

Background technology

At present, the advantage such as induction heating is high with its efficiency of heating surface, quick heating, controllability are good, is widely used in the fields such as melting, diathermanous, quenching, and induction heating power is one of its key equipment.In induction heating power, major loop adopts 380V three-phase alternating current to deliver to thyristor SCR, then carries out three phase full bridge controlled rectification output 0 ~ 500V direct voltage.And the trigger impulse of thyristor SCR need to carry out introducing after △-Y conversion from three-phase synchronous transformer.The line order of power requirement three-phase inlet wire must be correct so, otherwise system is by cisco unity malfunction.If judgement three-phase phase-sequence also will manually detect by instruments such as oscilloscopes.

Retrieving existing patent finds, close patented technology has, Chinese Patent Application No.: 200510024181.2 and 200510027934.5, patent name is respectively: three phase full bridge controllable silicon welding power source main loop digital triggering method, silicon weld power supply phase sequence from three phase total bridge self-adaptation digital triggering method.First patent provides three phase full bridge controllable silicon welding power source main loop digital triggering method, this patent major loop has adopted Y-delta connection, synchrotrans have adopted Y-Y connection, and the numeral that has finally realized thyristor supply triggers and controls, but still will guarantee to access the correctness of power phase.Second patent provides silicon weld power supply phase sequence from three phase total bridge self-adaptation digital triggering method, this patent has also adopted Y-delta connection in major loop, synchrotrans have adopted Y-Y connection, the numeral that has realized thyristor supply triggers and controls, and utilizes dsp chip to realize automatic detection and the switching of three-phase access phase sequence.But this patent has been used DSP technology, complex interfaces, and need level conversion, also can make technical costs and material cost increase to some extent.

Summary of the invention

The object of the invention is the problem that can not arbitrarily access for traditional induction heating power three-phase phase-sequence, a kind of phase sequence self-adaption circuits for triggering of three-phase fully-controlled rectification induction heating power are proposed, can realize any access of induction heating power triple line order, and there is feature simple in structure, with low cost.

The present invention adopts following technical scheme for completing foregoing invention object:

A kind of phase sequence self-adaption circuits for triggering of three-phase fully-controlled rectification induction heating power, the phase sequence self-adaption circuits for triggering of induction heating power are serially connected between three-phase alternating current and three phase full bridge thyristor driver bridge, mainly comprise sequence judging circuit, three-phase synchronous signal additional phase shift and phase sequence gating circuit, Thyristor Three-phase trigger impulse phase-shift circuit and three-phase trigger pulse gating and output circuit; Three-phase alternating current A, B, C connect △ shape after being converted to Y shape and connecting and provide synchronizing signal for the phase sequence self-adaption circuits for triggering of induction heating power through synchrotrans; Three-phase access phase sequence by sequence judging circuit judgement induction heating power, and according to the result judging, by three-phase synchronous signal additional phase shift and phase sequence gating circuit, produce suitable three phase rectifier trigger impulse, and three phase rectifier trigger impulse is sent in Thyristor Three-phase trigger impulse phase-shift circuit and produced phase shift, in order to regulate the pulse-triggered angle of rectified three-phase circuit, realize the adjustment of rectifier output voltage; Three phase rectifier trigger impulse after phase shift is delivered to three-phase trigger pulse gating and output circuit, drives the thyristor of three phase full bridge thyristor driver bridge, realizes the self adaptation of phase sequence and the adjusting of three phase rectifier output voltage.

Described sequence judging circuit, when powering on, system judges three-phase access phase sequence, the result of judgement is delivered to three-phase synchronous signal additional phase shift and phase sequence gating circuit and three-phase trigger pulse gating and output circuit, and sequence judging circuit consists of voltage comparator and d type flip flop; PHASE A, PHASE B, PHASE C enter into respectively corresponding voltage comparator U7A, U7B, the in-phase input end of U7C through resistance R 1, R62, R63; Simultaneously R65, R64 right+15V carries out dividing potential drop, the inverting input of partial pressure value access voltage comparator U7A, U7B, U7C, is compared with partial pressure value respectively the magnitude of voltage of PHASE A, PHASE B, PHASE C by voltage comparator U7A, U7B, U7C; On the one hand, the result of three voltage comparator U7A, U7B, U7C output through or door U15D, a U15B deliver to " OPEN PHASE " end; On the other hand, the clock CLK end of d type flip flop U10A is delivered in the output of voltage comparator U7A, and the input D end of d type flip flop U10A is delivered in the output of voltage comparator U7B; The Q output of d type flip flop U10A by or the door U15A DL2 that is connected with light-emitting diode,

output is passed through or a door U15C is connected with light-emitting diode DL1; The Q output signal PHASEZF of d type flip flop U10B,

output signal PHASEZP, and signal PHASEZF, PHASEZP are sent in the analog switch of three-phase synchronous signal additional phase shift and phase sequence gating circuit, signal PHASEZF is sent in the multiway analog switch of three-phase trigger pulse gating and output circuit simultaneously; If three-phase alternating current A, B, C lack one mutually or two phase times, so corresponding voltage comparator will be exported a low-voltage (about 0.7V); In the one-period of three-phase electricity, always have a time period, the output of three voltage comparators is all low level; " OPEN PHASE " output low level now, whole induction heating power can send " phase shortage " and report to the police, by whole system dump, in order to avoid phase shortage is brought damage to equipment; Until open-phase fault is removed;

The positive and negative method of described sequence judging circuit judgement phase sequence has PHASEB hysteresis PHASEA, or two kinds of situations of PHASEA hysteresis PHASEB.When PHASEB hysteresis PHASEA, B lags behind A phase time mutually, and voltage comparator U7B is defeated low-voltage first, after voltage comparator U7A, provides high voltage, and the CLK of d type flip flop U10A is that rising edge is effective, Q output 0,

output 1, light-emitting diode DL1 is bright, and light-emitting diode DL2 does not work; Light-emitting diode DL1 is bright, judges PHASEZF=0, PHASEZP=1; When PHASEA hysteresis PHASEB, light-emitting diode DL2 is bright, judges PHASEZF=1, PHASEZP=0; When PHASEA hysteresis PHASEB, A lags behind B phase time mutually, and the first output HIGH voltage of voltage comparator U7B, provides high voltage after U7A, and the CLK of d type flip flop U10A is that rising edge is effective; Q output 1,

output 0, light-emitting diode DL2 is bright, and light-emitting diode DL1 does not work, and the D end of d type flip flop U10B is delivered in 1 of Q output simultaneously, at the CLK of the moment d type flip flop U10B powering on, can obtain a rising edge, the Q output 1 of d type flip flop U10B,

output 0, i.e. PHASEZF=1, PHASEZP=0.

Described three-phase synchronous signal additional phase shift and phase sequence gating circuit, the three-phase alternating current that synchrotrans are produced produces an added phase shift, and the result PHASEZF being exported by sequence judging circuit, PHASEZP adjust three-phase alternating current triggering phase sequence by analog switch; Three-phase ac signal after phase sequence adjustment is delivered to Thyristor Three-phase trigger impulse phase-shift circuit; Described three-phase synchronous signal additional phase shift and phase sequence gating circuit are mainly comprised of RC added phase shift network and analog switch; Three input SB5, SB6, the SB7 of three-phase synchronous signal additional phase shift and phase sequence gating circuit delivered in synchrotrans output, the RC added phase shift network that input SB5 forms through RP7, C44, PHASE A, the additional phase shift that produces 0 ~ 90 ° is coupled to VA by C46; The RC added phase shift network that input SB6 forms through RP8, C45, PHASE B, the additional phase shift that produces 0 ~ 90 ° is connected by C47 analog switch U17A, the U17B in parallel with two, the output of described analog switch U17A is coupled to VB, and the output of analog switch U17B is coupled to VC; The RC added phase shift network that input SB7 forms through RP15, C68, PHASE C, the additional phase shift that produces 0 ~ 90 ° is connected by C48 analog switch U17C, the U17D in parallel with two, the output of described analog switch U17C is coupled to VC, and the output of analog switch U17D is coupled to VB; Wherein said PHASE A, PHASE B, PHASE C are respectively the sliding end of RC phase-shift network resistance R P7, RP8, RP15; PHASEZF access analog switch U17B, U17D; PHASEZP access analog switch U17A, U17C.

When PHASEZP=1, the sinusoidal voltage after SB5 phase shift is coupled to VA through C46; Sinusoidal voltage after SB6 phase shift is coupled to analog switch U17A, U17B through C47, U17A gating now, and sinusoidal voltage is delivered to VB; Sinusoidal voltage after SB7 phase shift is coupled to analog switch U17C, U17D through C48, U17C gating now, and sinusoidal voltage is delivered to VC.

When PHASEZF=1, the sinusoidal voltage after SB5 phase shift is coupled to VA through C46; Sinusoidal voltage after SB6 phase shift is coupled to analog switch U17A, U17B through C47, U17B gating now, and sinusoidal voltage is delivered to VC; Sinusoidal voltage after SB7 phase shift is coupled to analog switch U17C, U17D through C48, U17D gating now, and sinusoidal voltage is delivered to VB.

Described Thyristor Three-phase trigger impulse phase-shift circuit receives three-phase ac signal VA, VB, the VC of three-phase synchronous signal additional phase shift and phase sequence gating circuit, and producing three-phase phase shifting trigger impulse according to the three-phase ac signal of phase shift controlling voltage and input, three-phase phase shifting trigger impulse is finally delivered to three-phase trigger pulse gating and output circuit; Described Thyristor Three-phase trigger impulse phase-shift circuit mainly consists of three-phase phase shifting chip U20, and the three-phase alternating current that three-phase synchronous signal additional phase shift and phase sequence gating circuit produce is delivered to three phase sine input VA, VB, the VC of three-phase phase shifting chip U20; Regulate the phase shift angle of the magnitude of voltage change three-phase pulse of three-phase phase shifting chip U20Vr, the magnitude of voltage of Vr is higher, the phase shift that three-phase pulse produces is just larger, and the output voltage of three phase full bridge controlled rectification is just less simultaneously, finally makes output voltage change between 0 ~ 500V; Three-phase phase shifting pulse is exported by A+, A-, BB+, BB-, CC+, CC-, wherein A+, A-, be same mutually opposite polarity trigger impulse, BB+, BB-are that same mutually opposite polarity trigger impulse, CC+, CC-are same mutually opposite polarity trigger impulses.

Described three-phase trigger pulse gating and output circuit receive the three-phase phase shifting trigger impulse that Thyristor Three-phase trigger impulse phase-shift circuit produces, and the result PHASEZF exporting according to sequence judging circuit, three-phase phase shifting trigger impulse is carried out to gating and output, and the thyristor driver bridge of three phase full bridge controlled rectification is delivered in the pulse of output the most at last; Described three-phase trigger pulse gating and output circuit mainly consist of multiway analog switch U23, U24 and current drives chip ULN2004; The result PHASEZF that sequence judging circuit is exported enters A, the B end of multiway analog switch U23, U24, the C end ground connection of multiway analog switch U23, U24; Three-phase phase shifting trigger impulse A+, the A-that Thyristor Three-phase trigger impulse phase-shift circuit produces exports in order to drive the signal of thyristor through current drives chip U21A, U21C, and signal is delivered to thyristor driver bridge, drives thyristor; Three-phase phase shifting trigger impulse BB+, the BB that Thyristor Three-phase trigger impulse phase-shift circuit produces-, CC+, CC-access respectively input X0, Y0, X1, the Y1 of multiway analog switch U23, U24, and after multiway analog switch U23, U24 process, its output B+, B-, C+, C-respectively by current drives chip U21E, U21F, U22B, U22A, U22C, U22D, U22E, U22F in order to drive the signal of thyristor, and signal is delivered to thyristor driver bridge, drive thyristor.

When PHASEZF=0, the CBA of U23, U24 is " 000 ", the X=X0 of U23, U24, Y=Y0, i.e. B+=, B-=BB-, C+=CC+, C-=CC-; Then B+, B-, C+, C-deliver to thyristor driving circuit by current drives chip U21E, U21F, U22B, U22A, U22C, U22D, U22E, U22F respectively, drive thyristor;

When PHASEZF=1, the CBA of U23, U24 is " 011 ", the X=X1 of U23, U24, Y=Y1, i.e. B+=CC+, B-=CC-, C+=BB+, C-=BB-; Then B+, B-, C+, C-deliver to thyristor driving circuit by current drives chip U21E, U21F, U22B, U22A, U22C, U22D, U22E, U22F respectively, drive thyristor.

The phase sequence self-adaption circuits for triggering of a kind of three-phase fully-controlled rectification induction heating power that the present invention proposes, the problem that can not arbitrarily access for traditional induction heating power three-phase phase-sequence, adopt voltage comparator, relatively synchrotrans institute's output voltage and a fixed voltage value, judge triple line order; Judged result removes to control three path analoging switch, realizes the self adaptation of phase sequence.Finally by three-phase phase shifting circuit, realize the magnitude of voltage of three phase rectifier output voltage; Realize any access of induction heating power triple line order, and there is feature simple in structure, with low cost.

Accompanying drawing explanation

Fig. 1 is the main circuit diagram of three-phase full-controlled rectifier bridge in the present invention.

Fig. 2 is the circuit diagram of sequence judging circuit in the present invention.

Fig. 3 is the circuit diagram of three-phase alternating current positive phase sequence in the present invention.

Fig. 4 is the circuit diagram of three-phase alternating current negative-phase sequence in the present invention.

Fig. 5 is three-phase synchronous signal additional phase shift and phase sequence gating circuit in the present invention.

Fig. 6 is Thyristor Three-phase trigger impulse phase-shift circuit in the present invention.

Fig. 7 is three-phase trigger pulse gating and output circuit in the present invention.

Embodiment

With specific embodiment, the present invention is illustrated by reference to the accompanying drawings:

As shown in Figure 1, a kind of phase sequence self-adaption circuits for triggering of three-phase fully-controlled rectification induction heating power, the phase sequence self-adaption circuits for triggering of induction heating power are serially connected between three-phase alternating current and three phase full bridge thyristor driver bridge, mainly comprise sequence judging circuit, three-phase synchronous signal additional phase shift and phase sequence gating circuit, Thyristor Three-phase trigger impulse phase-shift circuit and three-phase trigger pulse gating and output circuit, three-phase alternating current A, B, C connects △ shape after being converted to Y shape and connecting and provides synchronizing signal for the phase sequence self-adaption circuits for triggering of induction heating power through synchrotrans, by sequence judging circuit, judged the order of the three-phase access of induction heating power, and according to the result judging, by three-phase synchronous signal additional phase shift and phase sequence gating circuit, produce suitable three phase rectifier trigger impulse, and three phase rectifier trigger impulse is sent in Thyristor Three-phase trigger impulse phase-shift circuit and produced phase shift, in order to regulate the pulse-triggered angle of rectified three-phase circuit, realize the adjustment of rectifier output voltage, three phase rectifier trigger impulse after phase shift is delivered to three-phase trigger pulse gating and output circuit, drives the thyristor of three phase full bridge thyristor driver bridge, realizes the self adaptation of phase sequence and the adjusting of three phase rectifier output voltage.

As shown in Figure 2, described sequence judging circuit, when system powers on, judge three-phase access phase sequence, the result of judgement is delivered to three-phase synchronous signal additional phase shift and phase sequence gating circuit and three-phase trigger pulse gating and output circuit, and sequence judging circuit consists of voltage comparator and d type flip flop; PHASE A, PHASE B, PHASE C enter into respectively corresponding voltage comparator U7A, U7B, the in-phase input end of U7C through resistance R 1, R62, R63; Simultaneously R65, R64 right+15V carries out dividing potential drop, the inverting input of partial pressure value access voltage comparator U7A, U7B, U7C, is compared with partial pressure value respectively the magnitude of voltage of PHASE A, PHASE B, PHASE C by voltage comparator U7A, U7B, U7C; On the one hand, the result of three voltage comparator U7A, U7B, U7C output through or door U15D, a U15B deliver to " OPEN PHASE " end; On the other hand, the clock CLK end of d type flip flop U10A is delivered in the output of voltage comparator U7A, and the input D end of d type flip flop U10A is delivered in the output of U7B; The Q output of d type flip flop U10A by or the door U15A DL2 that is connected with light-emitting diode,

output is passed through or a door U15C is connected with light-emitting diode DL1;

The Q output signal PHASEZF of d type flip flop U10B,

output signal PHASEZP, and signal PHASEZF, PHASEZP are sent in the analog switch of three-phase synchronous signal additional phase shift and phase sequence gating circuit, signal PHASEZF is sent in the multiway analog switch of three-phase trigger pulse gating and output circuit simultaneously; If three-phase alternating current A, B, C lack one mutually or two phase times, so corresponding voltage comparator will be exported a low-voltage (about 0.7V); In the one-period of three-phase electricity, always have a time period, the output of three voltage comparators is all low level; " OPEN PHASE " output low level now, whole induction heating power can send " phase shortage " and report to the police, by whole system dump, in order to avoid phase shortage is brought damage to equipment; Until open-phase fault is removed;

The positive and negative method of described sequence judging circuit judgement phase sequence has PHASEB hysteresis PHASEA, or two kinds of situations of PHASEA hysteresis PHASEB; When PHASEB hysteresis PHASEA, B lags behind A phase time mutually, and voltage comparator U7B is defeated low-voltage first, after voltage comparator U7A, provides high voltage, and the CLK of d type flip flop U10A is that rising edge is effective, Q output 0,

output 1, Q output by or the door U15A DL2 that is connected with light-emitting diode,

exported or door a U15C be connected with light-emitting diode DL1,

Light-emitting diode DL1 is bright, and light-emitting diode DL2 does not work; Light-emitting diode DL1 is bright, judges PHASEZF=0, PHASEZP=1; When PHASEA hysteresis PHASEB, light-emitting diode DL2 is bright, judges PHASEZF=1, PHASEZP=0; When PHASEA hysteresis PHASEB, A lags behind B phase time mutually, and the first output HIGH voltage of voltage comparator U7B, provides high voltage after voltage comparator U7A, and the CLK of d type flip flop U10A is that rising edge is effective; Q output 1, output 0, light-emitting diode DL2 is bright, and light-emitting diode DL1 does not work, and the D end of d type flip flop U10B is delivered in 1 of Q output simultaneously, at the CLK of the moment d type flip flop U10B powering on, can obtain a rising edge, the Q output 1 of d type flip flop U10B,

output 0, i.e. PHASEZF=1, PHASEZP=0.

As shown in Figure 5, described three-phase synchronous signal additional phase shift and phase sequence gating circuit, the three-phase alternating current that synchrotrans are produced produces an added phase shift, and the result PHASEZF being exported by sequence judging circuit, PHASEZP adjust three-phase alternating current triggering phase sequence by analog switch; Three-phase ac signal after phase sequence adjustment is delivered to Thyristor Three-phase trigger impulse phase-shift circuit; Described three-phase synchronous signal additional phase shift and phase sequence gating circuit are mainly comprised of RC added phase shift network and analog switch; Three input SB5, SB6, the SB7 of three-phase synchronous signal additional phase shift and phase sequence gating circuit delivered in synchrotrans output, the RC added phase shift network that input SB5 forms through RP7, C44, PHASE A, the additional phase shift that produces 0 ~ 90 ° is coupled to VA by C46; The RC added phase shift network that input SB6 forms through RP8, C45, PHASE B, the additional phase shift that produces 0 ~ 90 ° is connected by C47 analog switch U17A, the U17B in parallel with two, the output of described analog switch U17A is coupled to VB, and the output of analog switch U17B is coupled to VC; The RC added phase shift network that input SB7 forms through RP15, C68, PHASE C, the additional phase shift that produces 0 ~ 90 ° is connected by C48 analog switch U17C, the U17D in parallel with two, the output of described analog switch U17C is coupled to VC, and the output of analog switch U17D is coupled to VB; Wherein said PHASE A, PHASE B, PHASE C are respectively the sliding end of RC phase-shift network resistance R P7, RP8, RP15; PHASEZF access analog switch U17B, U17D; PHASEZP access analog switch U17A, U17C.

When PHASEZP=1, the sinusoidal voltage after SB5 phase shift is coupled to VA through C46; Sinusoidal voltage after SB6 phase shift is coupled to analog switch U17A, U17B through C47, U17A gating now, and sinusoidal voltage is delivered to VB; Sinusoidal voltage after SB7 phase shift is coupled to analog switch U17C, U17D through C48, U17C gating now, and sinusoidal voltage is delivered to VC;

When PHASEZF=1, the sinusoidal voltage after SB5 phase shift is coupled to VA through C46; Sinusoidal voltage after SB6 phase shift is coupled to analog switch U17A, U17B through C47, U17B gating now, and sinusoidal voltage is delivered to VC; Sinusoidal voltage after SB7 phase shift is coupled to analog switch U17C, U17D through C48, U17D gating now, and sinusoidal voltage is delivered to VB.

As shown in Figure 6, described Thyristor Three-phase trigger impulse phase-shift circuit receives three-phase ac signal VA, VB, the VC of three-phase synchronous signal additional phase shift and phase sequence gating circuit, and producing three-phase phase shifting trigger impulse according to the three-phase ac signal of phase shift controlling voltage and input, three-phase phase shifting trigger impulse is finally delivered to three-phase trigger pulse gating and output circuit; Described Thyristor Three-phase trigger impulse phase-shift circuit mainly consists of three-phase phase shifting chip U20, and the three-phase alternating current that three-phase synchronous signal additional phase shift and phase sequence gating circuit produce is delivered to three phase sine input VA, VB, the VC of three-phase phase shifting chip U20; Regulate the phase shift angle of the magnitude of voltage change three-phase pulse of three-phase phase shifting chip U20Vr, the magnitude of voltage of Vr is higher, the phase shift that three-phase pulse produces is just larger, and the output voltage of three phase full bridge controlled rectification is just less simultaneously, finally makes output voltage change between 0 ~ 500V; Three-phase phase shifting pulse is exported by A+, A-, BB+, BB-, CC+, CC-, wherein A+, A-, be same mutually opposite polarity trigger impulse, BB+, BB-are that same mutually opposite polarity trigger impulse, CC+, CC-are same mutually opposite polarity trigger impulses; Wherein SCR_CON is the output of power adjustments potentiometer, after U5D amplification is anti-phase, sends into three-phase trigger pulse phase shift chip U20, in order to control three-phase trigger pulse phase shifting angle, realizes the control of three-phase whole school rectifier output voltage; RP10, R114 are used for the setting power upper limit, and R81, RP9 are used for setting power lower limit; When the sliding end magnitude of voltage of SCR_CON > RP10, amplifier U5B output LOW voltage (15V), D15 conducting, be clamped at-14.3V of J12 current potential left and right.When the sliding end magnitude of voltage of SCR_CON < RP9, amplifier U5C output HIGH voltage (+15V), D16 conducting, J12 current potential is clamped at 14.3V left and right.When RP10 > SCR_CON > RP9, amplifier U5B output HIGH voltage (+15V), amplifier U5C(TL084) output LOW voltage (15V), D15, D16 all end.Now power bound circuit is inoperative to the voltage of J12.RP23, R85 are additional DC level, guarantee that amplifier U5D is output as positive voltage.

As shown in Figure 7, described three-phase trigger pulse gating and output circuit receive the three-phase phase shifting trigger impulse that Thyristor Three-phase trigger impulse phase-shift circuit produces, and the result PHASEZF exporting according to sequence judging circuit, three-phase phase shifting trigger impulse is carried out to gating and output, and the thyristor driver bridge of three phase full bridge controlled rectification is delivered in the pulse of output the most at last; Described three-phase trigger pulse gating and output circuit mainly consist of multiway analog switch U23, U24 and current drives chip ULN2004; The result PHASEZF that sequence judging circuit is exported enters A, the B end of multiway analog switch U23, U24, the C end ground connection of multiway analog switch U23, U24; Three-phase phase shifting trigger impulse A+, A-that Thyristor Three-phase trigger impulse phase-shift circuit produces export in order to drive signal SA26, the SA27 of thyristor and signal SA26, SA27 are delivered to thyristor driver bridge through current drives chip U21A, U21B, U21C, U21D, drive thyristor, wherein said driving chip U21A, U21B are in parallel, driving chip U21C, U21D are in parallel; Three-phase phase shifting trigger impulse BB+, the BB that Thyristor Three-phase trigger impulse phase-shift circuit produces-, CC+, CC-access respectively input X0, Y0, X1, the Y1 of multiway analog switch U23, U24, and after multiway analog switch U23, U24 process, its output B+, B-, C+, C-export in order to drive signal SA28, SA29, SA30, the SA31 of thyristor and signal SA26, SA27 are delivered to thyristor driver bridge by current drives chip U21E, U21F, U22B, U22A, U22C, U22D, U22E, U22F respectively, drive thyristor; Output signal SA28 after wherein said current drives chip U21E, U21F parallel connection, output signal SA29 after described current drives chip U22B, U22A parallel connection, output signal SA30 after described current drives chip U22C, U22D parallel connection, output signal SA31 after described current drives chip U22E, U22F parallel connection.

When PHASEZF=0, the CBA of U23, U24 is " 000 ", the X=X0 of U23, U24, Y=Y0, i.e. B+=, B-=BB-, C+=CC+, C-=CC-; Then B+, B-, C+, C-deliver to thyristor driving circuit by current drives chip U21E, U21F, U22B, U22A, U22C, U22D, U22E, U22F respectively, drive thyristor;

When PHASEZF=1, the CBA of U23, U24 is " 011 ", the X=X1 of U23, U24, Y=Y1, i.e. B+=CC+, B-=CC-, C+=BB+, C-=BB-; Then B+, B-, C+, C-deliver to thyristor driving circuit by current drives chip U21E, U21F, U22B, U22A, U22C, U22D, U22E, U22F respectively, drive thyristor;

The three-phase alternating current of input connects in any case, and final phase sequence has two kinds of connections: connection is as shown in Figure 3 positive phase sequence for " ABCABC ... ", and it is negative-phase sequence that connection is as shown in Figure 4 " CBACBA ... ".

In this embodiment, described voltage comparator U7A, U7B, U7C all adopt existing module TL084 in prior art.

Described d type flip flop U10A, U10B all adopts existing module 4013 in prior art.

Described or door U15A, U15B, U15C, U15D all adopt existing module 4071 in prior art.

Described analog switch U17A, U17B, U17C, U17D all adopt existing module 4066 in prior art.

Described three-phase phase shifting chip U20 adopts existing module TC787 in prior art.

Described multiway analog switch U23, U24 all adopts existing module 4053 in prior art.

Described current drives chip U21A, U21B, U21C, U21D, U21E, U21F, U22B, U22A, U22C, U22D, U22E, U22F all adopt ULN2004 module of the prior art.

Described amplifier U5B, U5C, U5D all adopt TL084 module of the prior art.

Claims (1)

1. the phase sequence self-adaption circuits for triggering of a three-phase fully-controlled rectification induction heating power, it is characterized in that: the phase sequence self-adaption circuits for triggering of induction heating power are serially connected between three-phase alternating current and three phase full bridge thyristor driver bridge, mainly comprise sequence judging circuit, three-phase synchronous signal additional phase shift and phase sequence gating circuit, Thyristor Three-phase trigger impulse phase-shift circuit and three-phase trigger pulse gating and output circuit, three-phase alternating current A, B, C connects △ shape after being converted to Y shape and connecting and provides synchronizing signal for the phase sequence self-adaption circuits for triggering of induction heating power through synchrotrans, three-phase access phase sequence by sequence judging circuit judgement induction heating power, and according to the result judging, by three-phase synchronous signal additional phase shift and phase sequence gating circuit, produce suitable three phase rectifier trigger impulse, and three phase rectifier trigger impulse is sent in Thyristor Three-phase trigger impulse phase-shift circuit and produced phase shift, in order to regulate the pulse-triggered angle of rectified three-phase circuit, realize the adjustment of rectifier output voltage, three phase rectifier trigger impulse after phase shift is delivered to three-phase trigger pulse gating and output circuit, drives the thyristor of three phase full bridge thyristor driver bridge, realizes the self adaptation of phase sequence and the adjusting of three phase rectifier output voltage,

Described sequence judging circuit, when powering on, system judges three-phase access phase sequence, the result of judgement is delivered to three-phase synchronous signal additional phase shift and phase sequence gating circuit and three-phase trigger pulse gating and output circuit, and sequence judging circuit consists of voltage comparator and d type flip flop; PHASE A, PHASE B, PHASE C enter into respectively corresponding voltage comparator U7A, U7B, the in-phase input end of U7C through resistance R 1, R62, R63; Simultaneously R65, R64 right+15V carries out dividing potential drop, the inverting input of partial pressure value access voltage comparator U7A, U7B, U7C, is compared with partial pressure value respectively the magnitude of voltage of PHASE A, PHASE B, PHASE C by voltage comparator U7A, U7B, U7C; On the one hand, the result of three voltage comparator U7A, U7B, U7C output through or door U15D, a U15B deliver to " OPEN PHASE " end; On the other hand, the clock CLK end of d type flip flop U10A is delivered in the output of voltage comparator U7A, and the input D end of d type flip flop U10A is delivered in the output of voltage comparator U7B; The Q output of d type flip flop U10A is passed through or a door U15A is connected with light-emitting diode DL2,

output is passed through or a door U15C is connected with light-emitting diode DL1; The Q output signal PHASEZF of d type flip flop U10B,

output signal PHASEZP, and signal PHASEZF, PHASEZP are sent in the analog switch of three-phase synchronous signal additional phase shift and phase sequence gating circuit, signal PHASEZF is sent in the multiway analog switch of three-phase trigger pulse gating and output circuit simultaneously; If three-phase alternating current A, B, C lack one mutually or two phase times, so corresponding voltage comparator will be exported the low-voltage of a 0.7V; In the one-period of three-phase electricity, always have a time period, the output of three voltage comparators is all low level; " OPEN PHASE " output low level now, whole induction heating power can send " phase shortage " and report to the police, by whole system dump, in order to avoid phase shortage is brought damage to equipment; Until open-phase fault is removed;

The positive and negative method of described sequence judging circuit judgement phase sequence has PHASEB hysteresis PHASEA, or two kinds of situations of PHASEA hysteresis PHASEB; When PHASEB hysteresis PHASEA, B lags behind A phase time mutually, and the first output LOW voltage of voltage comparator U7B, provides high voltage after voltage comparator U7A, and the CLK of d type flip flop U10A is that rising edge is effective, Q output 0, output 1, light-emitting diode DL1 is bright, and light-emitting diode DL2 does not work; Light-emitting diode DL1 is bright, judges PHASEZF=0, PHASEZP=1; When PHASEA hysteresis PHASEB, light-emitting diode DL2 is bright, judges PHASEZF=1, PHASEZP=0; When PHASEA hysteresis PHASEB, A lags behind B phase time mutually, and the first output HIGH voltage of voltage comparator U7B, provides high voltage after U7A, and the CLK of d type flip flop U10A is that rising edge is effective; Q output 1,

output 0, light-emitting diode DL2 is bright, and light-emitting diode DL1 does not work, and the D end of d type flip flop U10B is delivered in 1 of Q output simultaneously, at the CLK of the moment d type flip flop U10B powering on, can obtain a rising edge, the Q output 1 of d type flip flop U10B,

output 0, i.e. PHASEZF=1, PHASEZP=0;

Described three-phase synchronous signal additional phase shift and phase sequence gating circuit, the three-phase alternating current that synchrotrans are produced produces an added phase shift, and the result PHASEZF being exported by sequence judging circuit, PHASEZP adjust three-phase alternating current triggering phase sequence by analog switch; Three-phase ac signal after phase sequence adjustment is delivered to Thyristor Three-phase trigger impulse phase-shift circuit; Described three-phase synchronous signal additional phase shift and phase sequence gating circuit are mainly comprised of RC added phase shift network and analog switch; Three input SB5, SB6, the SB7 of three-phase synchronous signal additional phase shift and phase sequence gating circuit delivered in synchrotrans output, the RC added phase shift network that input SB5 forms through RP7, C44, PHASE A, the additional phase shift that produces 0 ~ 90 ° is coupled to VA by C46; The RC added phase shift network that input SB6 forms through RP8, C45, PHASE B, the additional phase shift that produces 0 ~ 90 ° is connected by C47 analog switch U17A, the U17B in parallel with two, the output of described analog switch U17A is coupled to VB, and the output of analog switch U17B is coupled to VC; The RC added phase shift network that input SB7 forms through RP15, C68, PHASE C, the additional phase shift that produces 0 ~ 90 ° is connected by C48 analog switch U17C, the U17D in parallel with two, the output of described analog switch U17C is coupled to VC, and the output of analog switch U17D is coupled to VB; Wherein said PHASE A, PHASE B, PHASE C are respectively the sliding end of RC phase-shift network resistance R P7, RP8, RP15; PHASEZF access analog switch U17B, U17D; PHASEZP access analog switch U17A, U17C;

When PHASEZP=1, the sinusoidal voltage after SB5 phase shift is coupled to VA through C46; Sinusoidal voltage after SB6 phase shift is coupled to analog switch U17A, U17B through C47, U17A gating now, and sinusoidal voltage is delivered to VB; Sinusoidal voltage after SB7 phase shift is coupled to analog switch U17C, U17D through C48, U17C gating now, and sinusoidal voltage is delivered to VC;

When PHASEZF=1, the sinusoidal voltage after SB5 phase shift is coupled to VA through C46; Sinusoidal voltage after SB6 phase shift is coupled to analog switch U17A, U17B through C47, U17B gating now, and sinusoidal voltage is delivered to VC; Sinusoidal voltage after SB7 phase shift is coupled to analog switch U17C, U17D through C48, U17D gating now, and sinusoidal voltage is delivered to VB;

Described Thyristor Three-phase trigger impulse phase-shift circuit receives three-phase ac signal VA, VB, the VC of three-phase synchronous signal additional phase shift and phase sequence gating circuit, and producing three-phase phase shifting trigger impulse according to the three-phase ac signal of phase shift controlling voltage and input, three-phase phase shifting trigger impulse is finally delivered to three-phase trigger pulse gating and output circuit; Described Thyristor Three-phase trigger impulse phase-shift circuit mainly consists of three-phase phase shifting chip U20, and the three-phase alternating current that three-phase synchronous signal additional phase shift and phase sequence gating circuit produce is delivered to three phase sine input VA, VB, the VC of three-phase phase shifting chip U20; Regulate the phase shift angle of the magnitude of voltage change three-phase pulse of three-phase phase shifting chip U20Vr, the magnitude of voltage of Vr is higher, the phase shift that three-phase pulse produces is just larger, and the output voltage of three phase full bridge controlled rectification is just less simultaneously, finally makes output voltage change between 0 ~ 500V; Three-phase phase shifting pulse is exported by A+, A-, BB+, BB-, CC+, CC-, wherein A+, A-, be same mutually opposite polarity trigger impulse, BB+, BB-are that same mutually opposite polarity trigger impulse, CC+, CC-are same mutually opposite polarity trigger impulses;

Described three-phase trigger pulse gating and output circuit receive the three-phase phase shifting trigger impulse that Thyristor Three-phase trigger impulse phase-shift circuit produces, and the result PHASEZF exporting according to sequence judging circuit, three-phase phase shifting trigger impulse is carried out to gating and output, and the thyristor driver bridge of three phase full bridge controlled rectification is delivered in the pulse of output the most at last; Described three-phase trigger pulse gating and output circuit mainly consist of multiway analog switch U23, U24 and current drives chip ULN2004; The result PHASEZF that sequence judging circuit is exported enters A, the B end of multiway analog switch U23, U24, the C end ground connection of multiway analog switch U23, U24; Three-phase phase shifting trigger impulse A+, the A-that Thyristor Three-phase trigger impulse phase-shift circuit produces exports in order to drive the signal of thyristor through current drives chip U21A, U21C, and signal is delivered to thyristor driver bridge, drives thyristor; Three-phase phase shifting trigger impulse BB+, the BB that Thyristor Three-phase trigger impulse phase-shift circuit produces-, CC+, CC-access respectively input X0, Y0, X1, the Y1 of multiway analog switch U23, U24, and after multiway analog switch U23, U24 process, its output B+, B-, C+, C-respectively by current drives chip U21E, U21F, U22B, U22A, U22C, U22D, U22E, U22F in order to drive the signal of thyristor, and signal is delivered to thyristor driver bridge, drive thyristor;

When PHASEZF=0, the CBA of U23, U24 is " 000 ", the X=X0 of U23, U24, Y=Y0, i.e. B+=, B-=BB-, C+=CC+, C-=CC-; Then B+, B-, C+, C-deliver to thyristor driving circuit by current drives chip U21E, U21F, U22B, U22A, U22C, U22D, U22E, U22F respectively, drive thyristor;

When PHASEZF=1, the CBA of U23, U24 is " 011 ", the X=X1 of U23, U24, Y=Y1, i.e. B+=CC+, B-=CC-, C+=BB+, C-=BB-; Then B+, B-, C+, C-deliver to thyristor driving circuit by current drives chip U21E, U21F, U22B, U22A, U22C, U22D, U22E, U22F respectively, drive thyristor.

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