CN104836423A - Three-phase bridge rectifier circuit silicon controlled rectifier triggering method and three-phase bridge rectifier circuit silicon controlled rectifier triggering device - Google Patents
Three-phase bridge rectifier circuit silicon controlled rectifier triggering method and three-phase bridge rectifier circuit silicon controlled rectifier triggering device Download PDFInfo
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- CN104836423A CN104836423A CN201510260524.9A CN201510260524A CN104836423A CN 104836423 A CN104836423 A CN 104836423A CN 201510260524 A CN201510260524 A CN 201510260524A CN 104836423 A CN104836423 A CN 104836423A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/2173—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a biphase or polyphase circuit arrangement
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
- H02M1/092—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the control signals being transmitted optically
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Abstract
The invention discloses a three-phase bridge rectifier circuit silicon controller rectifier triggering method and a three-phase bridge rectifier circuit silicon controlled rectifier triggering device, and relates to the technical field of three-phase rectification. The invention aims to solve the technical problems of directly connecting a photoelectric coupler to a three-phase circuit so as to detect a natural phase change point, adopting a current deviation judgment circuit to replace current sampling and analog-to-digital conversion required by a general controller and adopting a simple deviation control algorithm to replace complicated calculation in a general control algorithm. A scheme adopted to solve the technical problems is that the three-phase bridge rectifier circuit silicon controlled rectifier triggering device is characterized by comprising a three-phase electric detection circuit, a current deviation judgment circuit, a main control circuit and six groups of triggering circuits. The three-phase bridge rectifier circuit silicon controlled rectifier triggering device is enabled to be simple in structure, convenient to install, easy to maintain and good in system stability through combination and optimization of the unit circuits.
Description
Technical field
The present invention relates to three phase rectifier technical field, specifically, is a kind of three-phase bridge rectifier circuit control machines method and device.
Background technology
Three-phase controllable silicon rectification circuit is industrial conventional rectified three-phase circuit.At present, there are three problems in rectified three-phase circuit: the first, in natural commutation point testing circuit, the normal synchrotrans that adopt complete level conversion.There are problems in synchrotrans, as large in volume, price is high, energy consumption is many, have certain electromagnetic pollution.The second, output current controlling unit calculation of complex, efficiency are low.The output current controlling unit of conventional rectified three-phase circuit adopts A/D converter to gather electric current usually, and controller adopts comparatively complicated control algolithm to control electric current, the cycle of operation is long, and real-time is poor, and needs price intelligent chip costly.Three, the synchronism of triggering signal is poor, thus causes circuit to there is potential safety hazard.At home, on three-phase controllable silicon rectification circuit direction, pertinent literature or patent is not also had to solve the problem.
Summary of the invention
One of technical problem to be solved by this invention is: provide a kind of phase bridge rectifier controlled silicon triggering device, by combination and the optimization of element circuit, its structure simply, is conveniently installed, is easy to the good stability of maintenance, system, and not by phase order constrained, no matter be positive phase sequence or negative-phase sequence, circuit all can normally work.
Two of technical problem to be solved by this invention is: provide a kind of phase bridge rectifier control machines method, be directly connected with three-phase circuit by photoelectrical coupler, detects natural commutation point, saves the shortcoming that synchrotrans bring; Adopt current deviation decision circuitry to replace current sample and the analog-to-digital conversion part of Common Controller, and adopt dual comparator circuit to carry out judgment bias; Adopting a kind of simple Deviation Control algorithm, eliminate the complicated calculations process in the conventional Control Method such as PID, fuzzy control, strengthening real-time by shortening control cycle; Adopt three intelligent control chips to control the SCR trigger pulse of each phase in three phase mains respectively, make whole device to the not requirement of three phase mains access phase sequence.
One of scheme that technical solution problem adopts is: a kind of three-phase bridge rectifier circuit controlled silicon triggering device, it is characterized in that: it comprises: three-phase synchronous testing circuit, current deviation decision circuitry, governor circuit and six groups of thyristor gating circuits, described three-phase synchronous testing circuit adopts six optocoupler circuits to be connected with three-phase circuit by current-limiting resistance, detect the natural commutation point of three-phase voltage, often connect two optocoupler circuits respectively mutually, one end, input port of each optocoupler circuit connects the phase in three phase mains, the other end is connected to other two-phase by two other optocoupler circuit, the output of each optocoupler circuit is connected with governor circuit, described current deviation decision circuitry first detects the DC current flow after rectification by current detection circuit, this direct current is converted to direct voltage by accurate sample resistance, direct voltage gives the positive input terminal of comparator one and the negative input end of comparator two, specified rate gives the negative input end of comparator one and the positive input terminal of comparator two, when direct voltage is greater than specified rate, comparator one and comparator two export high level signal and low level signal respectively, when direct voltage is less than specified rate, comparator one and comparator two output low level and high level respectively, when direct voltage equals specified rate, two comparators output low level simultaneously, comparative result gives the input port of the master chip of governor circuit after optocoupler circuit isolation, described governor circuit is made up of three intelligent chips, each intelligent chip is connected with two optocoupler circuit outputs of every phase, each intelligent chip is also connected with two thyristor gating circuits on this phase brachium pontis, silicon controlled break-make is controlled by circuits for triggering, the chip be connected with current deviation decision circuitry in three intelligent chips is master chip, other two is from chip, serial communication and master chip is adopted to carry out data communication, all control algolithms all complete in master chip, the output variable that control algolithm produces, send the timer of master chip to, and send the timer from chip to by serial communication, described six circuits for triggering each be connected with two chips, according to the output Pulse Width Control silicon controlled conducting of chip, each intelligent chip only gathers the signal of two photoelectrical couplers be connected with this chip, and only control four thyristor gating circuits be connected with this chip, thus form three independently control loops, the order of three control loops has nothing to do with the phase sequence of power supply, therefore do not need during main circuit connection to consider phase sequence.
Two of the scheme that technical solution problem adopts is: a kind of three-phase bridge rectifier circuit control machines method, and it is characterized in that, it comprises following content:
A. in six photoelectrical couplers, one end of each optocoupler circuit input port connects the phase in three phase mains, the other end is connected to other two-phase by two other optocoupler circuit, the moment that each photoelectrical coupler starts conducting is the natural commutation point between two-phase, be connected to two photoelectrical couplers often gone up mutually, the moment that one of them photoelectrical coupler starts conducting is this natural commutation point on positive half cycle, and the moment that another photoelectrical coupler starts conducting is this natural commutation point on negative half period;
B. specified rate is set by slide rheostat, the direct voltage of feedback compares in hardware comparator with specified rate, comparative result is switching value, send in the control algolithm of the master chip of governor circuit, control algolithm draws current phase shifting angle according to the phase shifting angle of comparative result and initial setting, and convert phase shifting angle to corresponding delay time, send into the timer of each intelligent chip in governor circuit, after natural commutation point being detected, start timer trigger, time delay terminates rear master controller and sends pulse signal triggering controlled silicon conducting;
C. in governor circuit, the output variable of control algolithm sends to from chip by wire communication mode or wireless communication mode by master chip, controls the controlled silicon conducting of corresponding circuits for triggering from chip according to the output variable that the natural commutation point detected and master chip send.
Three-phase bridge rectifier circuit controlled silicon triggering device of the present invention eliminates the links such as synchrotrans, photoelectrical coupler is directly utilized to detect three-phase alternating current natural commutation point signal, add stability and the accuracy of regulating circuit, reduce system energy consumption, avoid the interference that synchrotrans produce electrical network; In addition, the positive negative signal of deviation that effective hardware circuit comes required for detection control algorithm is utilized in device, the positive negative signal of deviation sends into master controller with the form of switching value, eliminate the change-over time of analog to digital converter, adopt two comparator judgment bias simultaneously, the positive and negative signal that not only can deviate, and the zero-signal of deviation can be obtained; Have employed three intelligent control chips in device, control each phase trigger impulse respectively, realize data real-time exchange by high-speed intelligent chip serial communication, ensure that the consistency of each phase phase shifting angle; What control algolithm adopted is phase-shifting trigger, connects the size variation that and zero-signal positive and negative according to deviation decides Trigger Angle; The thyristor gating circuit of device can produce strong start pulse signal, and governor circuit not only sends pulse signal, also sends corresponding COMPLEMENT pulse signals, ensures the reliable and stable triggering of silicon controlled; Three independently control loops are defined, no matter power supply is the normal work that positive phase sequence or negative-phase sequence do not affect circuit based on three intelligent control chips.
The combination of the signal that three-phase bridge rectifier circuit control machines method of the present invention feeds back according to photoelectrical coupler judges natural commutation point, greatly reduce hardware spending, also reduce time overhead, not only enhance the real-time of control circuit, accuracy and stability, also reduce the cost of control circuit, although the electric current exported fluctuates in the certain limit of set point, fluctuating range is very little, can meet the requirement of most user.
Accompanying drawing explanation
Fig. 1 is the structure chart of three-phase bridge rectifier circuit controlled silicon triggering device of the present invention;
Fig. 2 is the circuit theory diagrams of three-phase bridge rectifier circuit controlled silicon triggering device of the present invention;
Fig. 3 is the controllable silicon main circuit diagram of three-phase bridge rectifier circuit controlled silicon triggering device of the present invention;
Fig. 4 is the three-phase electricity oscillogram that three-phase bridge rectifier circuit controlled silicon triggering device of the present invention detects;
Fig. 5 is the master chip program flow diagram of three-phase bridge rectifier circuit control machines method of the present invention;
Fig. 6 be three-phase bridge rectifier circuit control machines method of the present invention from chip program flow chart.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
With reference to Fig. 1-Fig. 4, a kind of three-phase bridge rectifier circuit controlled silicon triggering device of the present invention, comprising: three-phase electricity testing circuit 10, current deviation decision circuitry 20, governor circuit 30 and six groups of circuits for triggering 40.
Described three-phase electricity testing circuit 10 is directly connected on three phase mains.By the three phase mains oscillogram shown in Fig. 4, work as Uac>0, Uab>0, during Ucb>0, AB phase starts conducting, and corresponding current flow paths is: A phase flows out, and lights the light-emitting diode in photoelectrical coupler U1 through resistance R1, light the light-emitting diode of photoelectrical coupler U4 again, then get back to B phase through resistance R4.The output 4 pin ground connection of photoelectrical coupler U1, output 3 pin access pull-up resistor R7 meets 5V again, during photoelectrical coupler U1 conducting, 3 leg signal are 0V, when photoelectrical coupler U1 ends, 3 leg signal are 5V, simultaneously, the signal that 3 pins export enters U7 through 1 pin of driving chip U7, is entered the P3.2 of single-chip microcomputer U11 after driving by 2 pins of driving chip U7.When the light-emitting diode of photoelectrical coupler U1 is lighted, photoelectrical coupler U1 conducting, the P3.2 of single-chip microcomputer U11 obtains 0V voltage, i.e. a trailing edge signal, this signal represents a natural commutation point.After U11 detects natural commutation point, then to send to GD1 on conduction pulses and P1.6 at P1.7 after self timer time delay and send supplements punching to GD6.
Work as Uab>0, Ubc>0, during Uac>0, AC phase starts conducting, corresponding current flow paths is: A phase flows out, light the light-emitting diode in photoelectrical coupler U1 through resistance R1, then light the light-emitting diode of photoelectrical coupler U6, then get back to C phase through resistance R6.The output 4 pin ground connection of photoelectrical coupler U6, output 3 pin access pull-up resistor R12 meets 5V again, during photoelectrical coupler U6 conducting, 3 leg signal are 0V, when photoelectrical coupler U6 ends, 3 leg signal are 5V, simultaneously, the signal that 3 pins export enters U7 through 13 pin of driving chip U7, is entered the P3.3 of single-chip microcomputer U13 after driving by 12 pins of driving chip U7.When the light-emitting diode of photoelectrical coupler U6 is lighted, photoelectrical coupler U6 conducting, the P3.3 of single-chip microcomputer U13 obtains 0V voltage, i.e. a trailing edge signal, this signal represents a natural commutation point.After U13 detects natural commutation point, then to send to GD2 on conduction pulses and P1.4 at P1.5 after self timer time delay and send supplements punching to GD1.
Work as Uba>0, Ubc>0, during Uac>0, BC phase starts conducting, corresponding current flow paths is: B phase flows out, light the light-emitting diode in photoelectrical coupler U3 through resistance R3, then light the light-emitting diode of photoelectrical coupler U6, then get back to C phase through resistance R6.The output 4 pin ground connection of photoelectrical coupler U3, output 3 pin access pull-up resistor R9 meets 5V again, during photoelectrical coupler U3 conducting, 3 leg signal are 0V, when photoelectrical coupler U3 ends, 3 leg signal are 5V, simultaneously, the signal that 3 pins export enters U7 through 5 pin of driving chip U7, is entered the P3.2 of single-chip microcomputer U12 after driving by 6 pins of driving chip U7.When the light-emitting diode of photoelectrical coupler U3 is lighted, photoelectrical coupler U3 conducting, the P3.2 of single-chip microcomputer U12 obtains 0V voltage, i.e. a trailing edge signal, this signal represents a natural commutation point.After U12 detects natural commutation point, then to send to GD3 on conduction pulses and P1.6 at P1.7 after self timer time delay and send supplements punching to GD2.
Work as Uba>0, Ubc>0, during Uca>0, BA phase starts conducting, corresponding current flow paths is: B phase flows out, light the light-emitting diode in photoelectrical coupler U3 through resistance R3, then light the light-emitting diode of photoelectrical coupler U2, then get back to A phase through resistance R2.The output 4 pin ground connection of photoelectrical coupler U2, output 3 pin access pull-up resistor R8 meets 5V again, during photoelectrical coupler U2 conducting, 3 leg signal are 0V, when photoelectrical coupler U2 ends, 3 leg signal are 5V, simultaneously, the signal that 3 pins export enters U7 through 3 pin of driving chip U7, is entered the P3.3 of single-chip microcomputer U11 after driving by 4 pins of driving chip U7.When the light-emitting diode of photoelectrical coupler U2 is lighted, photoelectrical coupler U2 conducting, the P3.3 of single-chip microcomputer U11 obtains 0V voltage, i.e. a trailing edge signal, this signal represents a natural commutation point.After U11 detects natural commutation point, then to send to GD4 on conduction pulses and P1.4 at P1.5 after self timer time delay and send supplements punching to GD3.
Work as Uba>0, Ucb>0, during Uca>0, CA phase starts conducting, corresponding current flow paths is: C phase flows out, light the light-emitting diode in photoelectrical coupler U5 through resistance R5, then light the light-emitting diode of photoelectrical coupler U2, then get back to A phase through resistance R2.The output 4 pin ground connection of photoelectrical coupler U5, output 3 pin access pull-up resistor R11 meets 5V again, during photoelectrical coupler U5 conducting, 3 leg signal are 0V, when photoelectrical coupler U5 ends, 3 leg signal are 5V, simultaneously, the signal that 3 pins export enters U7 through 11 pin of driving chip U7, is entered the P3.2 of single-chip microcomputer U13 after driving by 10 pins of driving chip U7.When the light-emitting diode of photoelectrical coupler U5 is lighted, photoelectrical coupler U5 conducting, the P3.2 of single-chip microcomputer U13 obtains 0V voltage, i.e. a trailing edge signal, this signal represents a natural commutation point.After U13 detects natural commutation point, then to send to GD5 on conduction pulses and P1.6 at P1.7 after self timer time delay and send supplements punching to GD4.
Work as Uab>0, Ucb>0, during Uca>0, CB phase starts conducting, corresponding current flow paths is: C phase flows out, light the light-emitting diode in photoelectrical coupler U5 through resistance R5, then light the light-emitting diode of photoelectrical coupler U4, then get back to B phase through resistance R4.The output 4 pin ground connection of photoelectrical coupler U4, output 3 pin access pull-up resistor R10 meets 5V again, during photoelectrical coupler U4 conducting, 3 leg signal are 0V, when photoelectrical coupler U4 ends, 3 leg signal are 5V, simultaneously, the signal that 3 pins export enters U7 through 9 pin of driving chip U7, is entered the P3.3 of single-chip microcomputer U12 after driving by 8 pins of driving chip U7.When the light-emitting diode of photoelectrical coupler U4 is lighted, photoelectrical coupler U4 conducting, the P3.3 of single-chip microcomputer U12 obtains 0V voltage, i.e. a trailing edge signal, this signal represents a natural commutation point.After U12 detects natural commutation point, then to send to GD6 on conduction pulses and P1.4 at P1.5 after self timer time delay and send supplements punching to GD5.
Described six groups of circuits for triggering 40 are conducting for triggering six controllable silicons GD1, GD2, GD3, GD4, GD5, GD6 on controllable silicon main circuit and shutoff.
The conduction pulses that the P1.7 of single-chip microcomputer U11 sends to GD1, the COMPLEMENT pulse signals that the P1.4 of single-chip microcomputer U13 sends to GD1.Two signals converge at 1 pin of driving chip U9.Because two signals are asynchronous, therefore can not mutually disturb.The amplifying circuit of field effect transistor VF1, resistance R13 and resistance R14 composition, 2 pins of the drive singal after converging via driving chip U9 and the drain electrode of field effect transistor VF1, then the primary coil entering pulse transformer T1 through the shaping of voltage stabilizing didoe VS1.Wherein diode VD1 for the protection of, resistance R15 and light-emitting diode D1 is used to indicate.The secondary coil of pulse transformer T1, by the filtering of the drive singal after isolation through resistance R16, R17 and electric capacity C6, is added to controllable silicon two ends, thus controls silicon controlled break-make.Wherein diode VD7 prevents electric current reverse, and diode VD8 is fly-wheel diode.G1 and K1 is connected to G1 and the K1 two ends of controllable silicon GD1.
The conduction pulses that the P1.5 of single-chip microcomputer U11 sends to GD4, the COMPLEMENT pulse signals that the P1.6 of single-chip microcomputer U13 sends to GD4.Two signals converge at 3 pins of driving chip U9.Because two signals are asynchronous, therefore can not mutually disturb.The amplifying circuit of field effect transistor VF2, resistance R18 and resistance R19 composition, 4 pins of the drive singal after converging via driving chip U9 and the drain electrode of field effect transistor VF2, then the primary coil entering pulse transformer T2 through the shaping of voltage stabilizing didoe VS2.Wherein diode VD2 for the protection of, resistance R20 and light-emitting diode D2 is used to indicate.The secondary coil of pulse transformer T2, by the filtering of the drive singal after isolation through resistance R21, R22 and electric capacity C7, is added to controllable silicon two ends, thus controls silicon controlled break-make.Wherein diode VD9 prevents electric current reverse, and diode VD10 is fly-wheel diode.G4 and K4 is connected to G4 and the K4 two ends of controllable silicon GD4.
The conduction pulses that the P1.7 of single-chip microcomputer U12 sends to GD3, the COMPLEMENT pulse signals that the P1.4 of single-chip microcomputer U11 sends to GD3.Two signals converge at 5 pins of driving chip U9.Because two signals are asynchronous, therefore can not mutually disturb.The amplifying circuit of field effect transistor VF3, resistance R23 and resistance R24 composition, 6 pins of the drive singal after converging via driving chip U9 and the drain electrode of field effect transistor VF3, then the primary coil entering pulse transformer T3 through the shaping of voltage stabilizing didoe VS3.Wherein diode VD3 for the protection of, resistance R25 and light-emitting diode D3 is used to indicate.The secondary coil of pulse transformer T3, by the filtering of the drive singal after isolation through resistance R26, R27 and electric capacity C8, is added to controllable silicon two ends, thus controls silicon controlled break-make.Wherein diode VD11 prevents electric current reverse, and diode VD12 is fly-wheel diode.G3 and K3 is connected to G3 and the K3 two ends of controllable silicon GD3.
The conduction pulses that the P1.5 of single-chip microcomputer U12 sends to GD6, the COMPLEMENT pulse signals that the P1.6 of single-chip microcomputer U11 sends to GD6.Two signals converge at 9 pins of driving chip U9.Because two signals are asynchronous, therefore can not mutually disturb.The amplifying circuit of field effect transistor VF4, resistance R28 and resistance R29 composition, 8 pins of the drive singal after converging via driving chip U9 and the drain electrode of field effect transistor VF4, then the primary coil entering pulse transformer T4 through the shaping of voltage stabilizing didoe VS4.Wherein diode VD4 for the protection of, resistance R30 and light-emitting diode D4 is used to indicate.The secondary coil of pulse transformer T4, by the filtering of the drive singal after isolation through resistance R31, R32 and electric capacity C9, is added to controllable silicon two ends, thus controls silicon controlled break-make.Wherein diode VD13 prevents electric current reverse, and diode VD14 is fly-wheel diode.G6 and K6 is connected to G6 and the K6 two ends of controllable silicon GD6.
The conduction pulses that the P1.7 of single-chip microcomputer U13 sends to GD5, the COMPLEMENT pulse signals that the P1.4 of single-chip microcomputer U12 sends to GD5.Two signals converge at 11 pins of driving chip U9.Because two signals are asynchronous, therefore can not mutually disturb.The amplifying circuit of field effect transistor VF5, resistance R33 and resistance R34 composition, 10 pins of the drive singal after converging via driving chip U9 and the drain electrode of field effect transistor VF5, then the primary coil entering pulse transformer T5 through the shaping of voltage stabilizing didoe VS5.Wherein diode VD5 for the protection of, resistance R35 and light-emitting diode D5 is used to indicate.The secondary coil of pulse transformer T5, by the filtering of the drive singal after isolation through resistance R36, R37 and electric capacity C10, is added to controllable silicon two ends, thus controls silicon controlled break-make.Wherein diode VD15 prevents electric current reverse, and diode VD16 is fly-wheel diode.G5 and K5 is connected to G5 and the K5 two ends of controllable silicon GD5.
The conduction pulses that the P1.5 of single-chip microcomputer U13 sends to GD2, the COMPLEMENT pulse signals that the P1.6 of single-chip microcomputer U12 sends to GD2.Two signals converge at 13 pins of driving chip U9.Because two signals are asynchronous, therefore can not mutually disturb.The amplifying circuit of field effect transistor VF6, resistance R38 and resistance R39 composition, 12 pins of the drive singal after converging via driving chip U9 and the drain electrode of field effect transistor VF6, then the primary coil entering pulse transformer T6 through the shaping of voltage stabilizing didoe VS6.Wherein diode VD6 for the protection of, resistance R40 and light-emitting diode D6 is used to indicate.The secondary coil of pulse transformer T6, by the filtering of the drive singal after isolation through resistance R41, R42 and electric capacity C11, is added to controllable silicon two ends, thus controls silicon controlled break-make.Wherein diode VD17 prevents electric current reverse, and diode VD18 is fly-wheel diode.G2 and K2 is connected to G2 and the K2 two ends of controllable silicon GD2.
Described current deviation decision circuitry 20 detects electric current at SCR rectification circuit DC output end access current transformer U16, the current output of Current Transformer Secondary side is linked into " feedback " end of current deviation decision circuitry 20, direct voltage is converted to again through electric capacity C1 filtering through resistance R48, resistance R43 and slide rheostat RP1 series connection dividing potential drop, ensure that output signal range is at 0 ~ 5V by 3 pins of adjustment slide rheostat RP1, through electric capacity C2 filtering, finally deliver to 2 pins of amplifier U8 and 3 pins of amplifier U14.1 pin of the rheostat RP2 of current deviation decision circuitry 20 meets VCC, rheostat RP2 2 GND, user is set to determining voltage signal by adjusting 3 pins of RP2, and signal is sent into 3 pins of amplifier U8 and 2 pins of amplifier U14.Amplifier U8 and amplifier U14 connects into comparator, when feedback signal is equal with Setting signal, then 1 pin of amplifier U8 and amplifier U14 is low level, the lumination of light emitting diode of photoelectrical coupler U10 and photoelectrical coupler U15, 3 pins of photoelectrical coupler U10 and photoelectrical coupler U15 and 4 pin conductings, 4 pins of photoelectrical coupler U10 and photoelectrical coupler U15 are now Gao Ping, 4 pins of photoelectrical coupler U10 have received the P3.4 of single-chip microcomputer U13, simultaneously through pull down resistor R45 ground connection, 4 pins of photoelectrical coupler U15 have received the P3.5 of single-chip microcomputer U13, simultaneously through pull down resistor R47 ground connection, therefore, now P3.4 and P3.5 of single-chip microcomputer U13 obtains high level simultaneously, when feedback signal is greater than Setting signal, then 1 pin of amplifier U8 is high level, 1 pin of photoelectrical coupler U15 is low level, as the 4 pin output low levels of above-mentioned photoelectrical coupler U10,4 pins of photoelectrical coupler U15 export high level, therefore the P3.4 of single-chip microcomputer U13 obtains low level, and P3.5 obtains high level, when feedback signal is less than Setting signal, then 1 pin of amplifier U8 is low level, 1 pin of photoelectrical coupler U15 is high level, 4 pins as above-mentioned photoelectrical coupler U10 export high level, the 4 pin output low levels of photoelectric coupling U15, therefore the P3.4 of single-chip microcomputer U13 obtains high level, and P3.5 obtains low level.So current deviation decision circuitry 20 can judge that detecting electric current is be greater than, be less than or equal to set-point rapidly, and namely current deviation is just, negative or zero, and result is sent into single-chip microcomputer.Single-chip microcomputer is tried to achieve output variable according to Deviation Control algorithm thus is controlled the phase shift of SCR trigger pulse.Described Deviation Control algorithm is: when electric current is greater than set-point and current deviation is timing, control algolithm output variable increases a value, thus timer delay time is increased, and moves after trigger impulse phase shifting angle, and rectification circuit output current reduces.Otherwise when electric current is less than set-point and current deviation is negative, control algolithm output variable reduces a value, thus makes timer delay time reduce, and trigger impulse phase shifting angle moves forward, and rectification circuit output current increases.When electric current is equal with set-point, control algolithm output variable is constant, and timer delay time is constant, and trigger impulse phase shifting angle is constant, and rectified output current is constant.Thus formation closed-loop control, utilize the phase shift of the positive and negative decision trigger impulse of current deviation, form closed-loop control, thus control output voltage and current stabilization are at set-point.
Described governor circuit 30 is made up of three single-chip microcomputers U11, U12 and U13.Three one-chip machine common power supplys; Share the reset circuit that resistance R5 and electric capacity C5 forms; Share the crystal oscillating circuit of electric capacity C3, electric capacity C4 and crystal oscillator X1 composition.The RXD pin of single-chip microcomputer U11 with U12 is connected with the TXD pin of single-chip microcomputer U13, transmits detection data for single-chip microcomputer U11 and U12 to single-chip microcomputer U13; Single-chip microcomputer U11 is connected with the RXD pin of single-chip microcomputer U13 with the TXD pin of single-chip microcomputer U12, sends the output variable that obtains of control algolithm to the timer of U11 and U12 for single-chip microcomputer U13 to single-chip microcomputer U11 and U12.Thus three single-chip microcomputers are with master-slave mode communication, wherein single-chip microcomputer U13 is host scm, and single-chip microcomputer U11 and single-chip microcomputer U12 is from single-chip microcomputer.
Each single-chip microcomputer only gathers the signal of two photoelectrical couplers be connected with this chip, and only controls four thyristor gating circuits being connected with this chip, thus forms three independently control loops, and the order of three control loops has nothing to do with the phase sequence of power supply.
Described photoelectrical coupler U1 to U6 and U10 and U15 is that chip MOC3083 is now sold in market.
Described U7 and U9 is that chip 7407 is now sold in market.
Described U11, U12 and U13 are 89C2051 single-chip microcomputers, and wherein U13 is host scm, and other two single-chip microcomputers are from single-chip microcomputer.
Described U8 and U14 is that chip operational amplifier 741 is now sold in market.
Described U16 is that industrial HK-D4I current transformer is controlled in China.
A kind of three-phase bridge rectifier circuit control machines method of the present invention is:
A. in six photoelectrical couplers, one end of each optocoupler circuit input port connects the phase in three phase mains, the other end is connected to other two-phase by two other optocoupler circuit, the moment that each photoelectrical coupler starts conducting is the natural commutation point between two-phase, be connected to two photoelectrical couplers often gone up mutually, the moment that one of them photoelectrical coupler starts conducting is this natural commutation point on positive half cycle, and the moment that another photoelectrical coupler starts conducting is this natural commutation point on negative half period:
B. specified rate is set by slide rheostat, the direct voltage of feedback compares in hardware comparator with specified rate, comparative result is switching value, send in the control algolithm of the master chip of governor circuit, control algolithm draws current phase shifting angle according to the phase shifting angle of comparative result and initial setting, and convert phase shifting angle to corresponding delay time, send into the timer of each intelligent chip in governor circuit, after natural commutation point being detected, start timer trigger, time delay terminates rear master controller and sends pulse signal triggering controlled silicon conducting:
C. in governor circuit, the output variable of control algolithm sends to from chip by wire communication mode or wireless communication mode by master chip, controls the controlled silicon conducting of corresponding circuits for triggering from chip according to the output variable that the natural commutation point detected and master chip send.
With reference to Fig. 5 and Fig. 6, as host scm with from single-chip microcomputer, the technology that the software program used is relevant technical staff in the field is familiar with, can according to power electronic technology, and automatic control technology, the correlation techniques such as computer technology are worked out.
Although by above embodiment to invention has been announcement, protection scope of the present invention is not limited thereto, under the condition not departing from the present invention's design, all will fall in right of the present invention the distortion, replacement etc. that above each component does.
Claims (2)
1. a three-phase bridge rectifier circuit controlled silicon triggering device, it is characterized in that: it comprises: three-phase synchronous testing circuit, current deviation decision circuitry, governor circuit and six groups of thyristor gating circuits, described three-phase synchronous testing circuit adopts six optocoupler circuits to be connected with three-phase circuit by current-limiting resistance, detect the natural commutation point of three-phase voltage, often connect two optocoupler circuits respectively mutually, one end, input port of each optocoupler circuit connects the phase in three phase mains, the other end is connected to other two-phase by two other optocoupler circuit, the output of each optocoupler circuit is connected with governor circuit, described current deviation decision circuitry first detects the DC current flow after rectification by current detection circuit, this direct current is converted to direct voltage by accurate sample resistance, direct voltage gives the positive input terminal of comparator one and the negative input end of comparator two, specified rate gives the negative input end of comparator one and the positive input terminal of comparator two, when direct voltage is greater than specified rate, comparator one and comparator two export high level signal and low level signal respectively, when direct voltage is less than specified rate, comparator one and comparator two output low level signal and high level signal respectively, when direct voltage equals specified rate, two comparators output low level signal simultaneously, comparative result gives the input port of the master chip of governor circuit after optocoupler circuit isolation, described governor circuit is made up of three intelligent chips, each intelligent chip is connected with two optocoupler circuit outputs of every phase, each intelligent chip is also connected with two thyristor gating circuits on this phase brachium pontis, silicon controlled break-make is controlled by circuits for triggering, the chip be connected with current deviation decision circuitry in three intelligent chips is master chip, other two is from chip, serial communication and master chip is adopted to carry out data communication from chip, all control algolithms all complete in master chip, the output variable that control algolithm produces, send the timer of master chip to, and send the timer from chip to by serial communication, described six circuits for triggering each be connected with two intelligent chips, according to the output Pulse Width Control silicon controlled conducting of chip, each intelligent chip only gathers the signal of two photoelectrical couplers be connected with this chip, and only control four thyristor gating circuits be connected with this chip, thus form three independently control loops, the order of three control loops has nothing to do with the phase sequence of power supply.
2. a three-phase bridge rectifier circuit control machines method, is characterized in that, it comprises following content:
A. in six photoelectrical couplers, one end of each optocoupler circuit input port connects the phase in three phase mains, the other end is connected to other two-phase by two other optocoupler circuit, the moment that each photoelectrical coupler starts conducting is the natural commutation point between two-phase, be connected to two photoelectrical couplers often gone up mutually, the moment that one of them photoelectrical coupler starts conducting is this natural commutation point on positive half cycle, and the moment that another photoelectrical coupler starts conducting is this natural commutation point on negative half period;
B. specified rate is set by slide rheostat, the direct voltage of feedback compares in hardware comparator with specified rate, comparative result is switching value, send in the control algolithm of the master chip of governor circuit, control algolithm draws current phase shifting angle according to the phase shifting angle of comparative result and initial setting, and convert phase shifting angle to corresponding delay time, send into the timer of each intelligent chip in governor circuit, after natural commutation point being detected, start timer trigger, time delay terminates rear master controller and sends pulse signal triggering controlled silicon conducting;
C. in governor circuit, the output variable of control algolithm sends to from chip by wire communication mode or wireless communication mode by master chip, controls the controlled silicon conducting of corresponding circuits for triggering from chip according to the output variable that the natural commutation point detected and master chip send.
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| CN109633482A (en) * | 2018-12-28 | 2019-04-16 | 北华大学 | A kind of control machines breakover detecting device |
| CN112968619A (en) * | 2021-02-23 | 2021-06-15 | 北华大学 | Trigger device and method for silicon controlled rectifier in single-phase alternating current circuit |
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| CN104836423B (en) | 2017-12-12 |
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