CN202696490U - Phase-sequence self-adaptive trigger circuit of three-phase fully-controlled rectifier induction heating power supply - Google Patents

Abstract

The utility model belongs to the field of the electrical technology and discloses a phase-sequence self-adaptive trigger circuit of a three-phase fully-controlled rectifier induction heating power supply. The phase-sequence self-adaptive trigger circuit is connected in series between three-phase alternating current and a three-phase full-bridge thyristor drive axle. The phase-sequence self-adaptive trigger circuit mainly comprises a phase sequence determining 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 pulse gating and output circuit. The phase sequence determining circuit is communicated with the thyristor three-phase trigger pulse phase shifting circuit via the three-phase synchronous signal additional phase shifting and phase sequence gating circuit, so as to adjust the pulse triggering angle of a three-phase rectifier circuit and realize the adjustment of a rectifier output voltage. The thyristor three-phase trigger pulse phase shifting circuit is communicated with the three-phase trigger pulse gating and output circuit, and is connected with a thyristor of the three-phase full-bridge thyristor drive axle via the three-phase trigger pulse gating and output circuit. The phase-sequence self-adaptive trigger circuit of the utility model realizes random access to the three-phase line sequence of the induction heating power supply and 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 utility model belongs to technical field of electricity, relates to a kind of start-up technique of induction heating power, is 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 the 380V three-phase alternating current to deliver to thyristor SCR, carries out three phase full bridge controlled rectification output 0 ~ 500V direct voltage again.And the trigger impulse of thyristor SCR need to carry out △-later on introducing of Y conversion from the three-phase synchronous transformer.The line order of power requirement three-phase inlet wire must be correct so, otherwise system is with cisco unity malfunction.If the 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 number: 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 the three phase full bridge controllable silicon welding power source main loop digital triggering method, this patent major loop has adopted the Y-delta connection, synchrotrans have adopted the Y-Y connection, have realized that finally the numeral of thyristor supply triggers control, but still will guarantee to access the correctness of power phase.Second patent provides the silicon weld power supply phase sequence from three phase total bridge self-adaptation digital triggering method, this patent has also adopted the Y-delta connection in major loop, synchrotrans have adopted the Y-Y connection, the numeral that has realized thyristor supply triggers control, and utilizes dsp chip to realize automatic detection and the switching of three-phase access phase sequence.But this patent has been used the DSP technology, complex interfaces, and need level conversion, technical costs and material cost are risen to some extent.

The utility model content

The purpose of this utility model 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 have characteristics simple in structure, with low cost.

The utility model adopts following technical scheme for finishing above-mentioned utility model purpose:

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 the 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; Described phase sequence self-adaption circuits for triggering are connected with three-phase alternating current A, B, C; Be connected with Thyristor Three-phase trigger impulse phase-shift circuit by three-phase synchronous signal additional phase shift and phase sequence gating circuit in order to the sequence judging circuit of judging induction heating power three-phase access phase sequence; Be connected with three-phase trigger pulse gating and output circuit, and link to each other with the thyristor of three phase full bridge thyristor driver bridge by three-phase trigger pulse gating and output circuit in order to the pulse-triggered angle of regulating rectified three-phase circuit, the Thyristor Three-phase trigger impulse phase-shift circuit of realizing the rectifier output voltage adjustment.

Described sequence judging circuit, when powering on, system judges three-phase access phase sequence, the result who judges delivers 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 is made 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 of d type flip flop U10A output by or the door U15A DL2 that links to each other with light-emitting diode,

Output is passed through or a door U15C links to each other 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, simultaneously signal PHASEZF is sent in the multiway analog switch of three-phase trigger pulse gating and output circuit; 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 (approximately 0.7V); Always have a time period in the one-period of three-phase electricity, the output of three voltage comparators all is low level; " OPEN PHASE " output low level at this moment, whole induction heating power can be sent " phase shortage " and report to the police, with the whole system dump, in order to avoid phase shortage is brought damage to equipment; Until open-phase fault is removed;

Described sequence judging circuit judges that the positive and negative method of phase sequence has PHASEB hysteresis PHASEA, perhaps two kinds of situations of PHASEA hysteresis PHASEB.When PHASEB hysteresis PHASEA, namely B lags behind the A phase time mutually, and voltage comparator U7B is defeated low-voltage first, provides high voltage behind the 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, namely A lags behind the B phase time mutually, and voltage comparator U7B elder generation output HIGH voltage provides high voltage behind the 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 simultaneously Q output, can obtain a rising edge at the CLK of the moment d type flip flop U10B that powers on, 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 adjusts three-phase alternating current triggering phase sequence by as a result PHASEZF, the PHASEZP of sequence judging circuit output by analog switch; Three-phase ac signal after the 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 mainly are 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 with analog switch U17A, the U17B of two parallel connections by C47, 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 with analog switch U17C, the U17D of two parallel connections by C48, 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 the SB5 phase shift is coupled to VA through C46; Sinusoidal voltage after the SB6 phase shift is coupled to analog switch U17A, U17B through C47, this moment the U17A gating, sinusoidal voltage is delivered to VB; Sinusoidal voltage after the SB7 phase shift is coupled to analog switch U17C, U17D through C48, this moment the U17C gating, sinusoidal voltage is delivered to VC.

When PHASEZF=1, the sinusoidal voltage after the SB5 phase shift is coupled to VA through C46; Sinusoidal voltage after the SB6 phase shift is coupled to analog switch U17A, U17B through C47, this moment the U17B gating, sinusoidal voltage is delivered to VC; Sinusoidal voltage after the SB7 phase shift is coupled to analog switch U17C, U17D through C48, this moment the U17D gating, 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 the three-phase phase shifting trigger impulse according to the three-phase ac signal of phase shift controlling voltage and input, the three-phase phase shifting trigger impulse is delivered to three-phase trigger pulse gating and output circuit at last; Described Thyristor Three-phase trigger impulse phase-shift circuit mainly is made 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; The magnitude of voltage of regulating three-phase phase shifting chip U20Vr changes the phase shift angle of three-phase pulse, 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, and output voltage is changed between 0 ~ 500V; The three-phase phase shifting pulse is by A+, A-, BB+, BB-, CC+, CC-output, 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 as a result PHASEZF that exports according to sequence judging circuit, the three-phase phase shifting trigger impulse is carried out 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 are made of multiway analog switch U23, U24 and current drives chip ULN2004; The as a 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 in order to driving the signal of thyristor, and delivers to the thyristor driver bridge with signal through current drives chip U21A, U21C output, 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 delivered to the thyristor driver bridge, drive thyristor.

When PHASEZF=0, the CBA of U23, U24 is " 000 ", the X=X0 of U23, U24 then, 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 then, 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 utility model 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 are judged the triple line order; Judged result removes to control three path analoging switch, realizes the self adaptation of phase sequence.The final magnitude of voltage of realizing the three phase rectifier output voltage by the three-phase phase shifting circuit; Realize any access of induction heating power triple line order, and had characteristics simple in structure, with low cost.

Description of drawings

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

Fig. 2 is the circuit diagram of sequence judging circuit in the utility model.

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

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

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

Fig. 6 is Thyristor Three-phase trigger impulse phase-shift circuit in the utility model.

Fig. 7 is three-phase trigger pulse gating and output circuit in the utility model.

Embodiment

With specific embodiment the utility model 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 the 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 through synchrotrans provides synchronizing signal for the phase sequence self-adaption circuits for triggering of induction heating power after being converted to Y shape and connecting, judged the order of the three-phase access of induction heating power by sequence judging circuit, and according to the result who judges, produce suitable three phase rectifier trigger impulse by three-phase synchronous signal additional phase shift and phase sequence gating circuit, and the three phase rectifier trigger impulse sent in the Thyristor Three-phase trigger impulse phase-shift circuit produce 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, judge three-phase access phase sequence when system powers on, the result of judgement delivers 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 is made 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 of d type flip flop U10A output by or the door U15A DL2 that links to each other with light-emitting diode, Output is passed through or a door U15C links to each other 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, simultaneously signal PHASEZF is sent in the multiway analog switch of three-phase trigger pulse gating and output circuit; 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 (approximately 0.7V); Always have a time period in the one-period of three-phase electricity, the output of three voltage comparators all is low level; " OPEN PHASE " output low level at this moment, whole induction heating power can be sent " phase shortage " and report to the police, with the whole system dump, in order to avoid phase shortage is brought damage to equipment; Until open-phase fault is removed;

Described sequence judging circuit judges that the positive and negative method of phase sequence has PHASEB hysteresis PHASEA, perhaps two kinds of situations of PHASEA hysteresis PHASEB; When PHASEB hysteresis PHASEA, namely B lags behind the A phase time mutually, and voltage comparator U7B is defeated low-voltage first, provides high voltage behind the voltage comparator U7A, 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 links to each other with light-emitting diode,

Exported or the door U15C link to each other 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, namely A lags behind the B phase time mutually, and voltage comparator U7B elder generation output HIGH voltage provides high voltage behind the 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 simultaneously Q output, can obtain a rising edge at the CLK of the moment d type flip flop U10B that powers on, 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 adjusts three-phase alternating current triggering phase sequence by as a result PHASEZF, the PHASEZP of sequence judging circuit output by analog switch; Three-phase ac signal after the 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 mainly are 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 with analog switch U17A, the U17B of two parallel connections by C47, 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 with analog switch U17C, the U17D of two parallel connections by C48, 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 the SB5 phase shift is coupled to VA through C46; Sinusoidal voltage after the SB6 phase shift is coupled to analog switch U17A, U17B through C47, this moment the U17A gating, sinusoidal voltage is delivered to VB; Sinusoidal voltage after the SB7 phase shift is coupled to analog switch U17C, U17D through C48, this moment the U17C gating, sinusoidal voltage is delivered to VC;

When PHASEZF=1, the sinusoidal voltage after the SB5 phase shift is coupled to VA through C46; Sinusoidal voltage after the SB6 phase shift is coupled to analog switch U17A, U17B through C47, this moment the U17B gating, sinusoidal voltage is delivered to VC; Sinusoidal voltage after the SB7 phase shift is coupled to analog switch U17C, U17D through C48, this moment the U17D gating, 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 the three-phase phase shifting trigger impulse according to the three-phase ac signal of phase shift controlling voltage and input, the three-phase phase shifting trigger impulse is delivered to three-phase trigger pulse gating and output circuit at last; Described Thyristor Three-phase trigger impulse phase-shift circuit mainly is made 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; The magnitude of voltage of regulating three-phase phase shifting chip U20Vr changes the phase shift angle of three-phase pulse, 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, and output voltage is changed between 0 ~ 500V; The three-phase phase shifting pulse is by A+, A-, BB+, BB-, CC+, CC-output, 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, sends into three-phase trigger pulse phase shift chip U20 after the U5D amplification is anti-phase, in order to control the 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 the setting power lower limit; When the sliding end magnitude of voltage of SCR_CON＞RP10, amplifier U5B output LOW voltage (15V), the D15 conducting, the J12 current potential is clamped at-14.3V about.When the sliding end magnitude of voltage of SCR_CON＜RP9, amplifier U5C output HIGH voltage (+15V), and the D16 conducting, the J12 current potential is clamped at about 14.3V.When RP10＞SCR_CON＞RP9, amplifier U5B output HIGH voltage (+15V), and amplifier U5C(TL084) (15V), D15, D16 all end output LOW voltage.This moment, power bound circuit was 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 as a result PHASEZF that exports according to sequence judging circuit, the three-phase phase shifting trigger impulse is carried out 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 are made of multiway analog switch U23, U24 and current drives chip ULN2004; The as a 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 signal SA26, the SA27 that drives thyristor and with signal SA26, SA27 through current drives chip U21A, U21B, U21C, U21D and delivers to the thyristor driver bridge, 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-deliver to the thyristor driver bridge by current drives chip U21E, U21F, U22B, U22A, U22C, U22D, U22E, U22F output in order to the signal SA28, the SA29 that drive thyristor, SA30, SA31 and with signal SA26, SA27 respectively, drive thyristor; Output signal SA28 after wherein said current drives chip U21E, the U21F parallel connection, output signal SA29 after described current drives chip U22B, the U22A parallel connection, output signal SA30 after described current drives chip U22C, the U22D parallel connection, output signal SA31 after described current drives chip U22E, the U22F parallel connection.

When PHASEZF=0, the CBA of U23, U24 is " 000 ", the X=X0 of U23, U24 then, 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 then, 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 as shown in Figure 3 is positive phase sequence for " ABCABC ... ", and it is negative-phase sequence that connection as shown in Figure 4 is " CBACBA ... ".

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

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

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

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

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

Described multiway analog switch U23, U24 all adopt existing module 4053 in the 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 (5)

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 the 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; Described phase sequence self-adaption circuits for triggering are connected with three-phase alternating current A, B, C; Be connected with Thyristor Three-phase trigger impulse phase-shift circuit by three-phase synchronous signal additional phase shift and phase sequence gating circuit in order to the sequence judging circuit of judging induction heating power three-phase access phase sequence; Be connected with three-phase trigger pulse gating and output circuit, and link to each other with the thyristor of three phase full bridge thyristor driver bridge by three-phase trigger pulse gating and output circuit in order to the pulse-triggered angle of regulating rectified three-phase circuit, the Thyristor Three-phase trigger impulse phase-shift circuit of realizing the rectifier output voltage adjustment.

2. the phase sequence self-adaption circuits for triggering of three-phase fully-controlled rectification induction heating power according to claim 1, it is characterized in that: described sequence judging circuit, when powering on, system judges three-phase access phase sequence, the result who judges delivers 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 is made 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 of d type flip flop U10A output by or the door U15A DL2 that links to each other with light-emitting diode,

Output is passed through or a door U15C links to each other 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, simultaneously signal PHASEZF is sent in the multiway analog switch of three-phase trigger pulse gating and output circuit; 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; Always have a time period in the one-period of three-phase electricity, the output of three voltage comparators all is low level; " OPEN PHASE " output low level at this moment, whole induction heating power can be sent " phase shortage " and report to the police, with the whole system dump, in order to avoid phase shortage is brought damage to equipment; Until open-phase fault is removed;

Described sequence judging circuit judges that the positive and negative method of phase sequence has PHASEB hysteresis PHASEA, perhaps two kinds of situations of PHASEA hysteresis PHASEB; When PHASEB hysteresis PHASEA, namely B lags behind the A phase time mutually, and voltage comparator U7B is defeated low-voltage first, provides high voltage behind the 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, namely A lags behind the B phase time mutually, and voltage comparator U7B elder generation output HIGH voltage provides high voltage behind the 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 simultaneously Q output, can obtain a rising edge at the CLK of the moment d type flip flop U10B that powers on, the Q output 1 of d type flip flop U10B,

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

3. the phase sequence self-adaption circuits for triggering of three-phase fully-controlled rectification induction heating power according to claim 1, it is characterized in that: 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 adjusts three-phase alternating current triggering phase sequence by as a result PHASEZF, the PHASEZP of sequence judging circuit output by analog switch; Three-phase ac signal after the 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 mainly are 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 with analog switch U17A, the U17B of two parallel connections by C47, 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 with analog switch U17C, the U17D of two parallel connections by C48, 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 the SB5 phase shift is coupled to VA through C46; Sinusoidal voltage after the SB6 phase shift is coupled to analog switch U17A, U17B through C47, this moment the U17A gating, sinusoidal voltage is delivered to VB; Sinusoidal voltage after the SB7 phase shift is coupled to analog switch U17C, U17D through C48, this moment the U17C gating, sinusoidal voltage is delivered to VC;

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

4. the phase sequence self-adaption circuits for triggering of three-phase fully-controlled rectification induction heating power according to claim 1, it is characterized in that: 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 the three-phase phase shifting trigger impulse according to the three-phase ac signal of phase shift controlling voltage and input, the three-phase phase shifting trigger impulse is delivered to three-phase trigger pulse gating and output circuit at last; Described Thyristor Three-phase trigger impulse phase-shift circuit mainly is made 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; The magnitude of voltage of regulating three-phase phase shifting chip U20Vr changes the phase shift angle of three-phase pulse, 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, and output voltage is changed between 0 ~ 500V; The three-phase phase shifting pulse is by A+, A-, BB+, BB-, CC+, CC-output, 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.

5. the phase sequence self-adaption circuits for triggering of three-phase fully-controlled rectification induction heating power according to claim 1, it is characterized in that: 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 as a result PHASEZF that exports according to sequence judging circuit, the three-phase phase shifting trigger impulse is carried out 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 are made of multiway analog switch U23, U24 and current drives chip ULN2004; The as a 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 in order to driving the signal of thyristor, and delivers to the thyristor driver bridge with signal through current drives chip U21A, U21C output, 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 delivered to the thyristor driver bridge, drive thyristor;

When PHASEZF=0, the CBA of U23, U24 is " 000 ", the X=X0 of U23, U24 then, 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 then, 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.

Images