CN102832833B - Alternating current to direct current conversion device of intermediate frequency converter - Google Patents
Alternating current to direct current conversion device of intermediate frequency converter Download PDFInfo
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- CN102832833B CN102832833B CN201210357486.5A CN201210357486A CN102832833B CN 102832833 B CN102832833 B CN 102832833B CN 201210357486 A CN201210357486 A CN 201210357486A CN 102832833 B CN102832833 B CN 102832833B
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Abstract
The invention discloses an alternating current to direct current conversion device of an intermediate frequency converter. The alternating current to direct current conversion device comprises a main switch, an isolation transformer, a charging resistor, a short circuit contactor, a space vector pulse width modulation (SVPWM) rectifier, a control board and a driving switching board, wherein a three-phase alternating current power grid is connected with the primary side of the isolation transformer; the secondary side of the isolation transformer is connected with the charging resistor and the control board; the charging resistor is connected in parallel with the short circuit contactor; the other end of the charging resistor is connected with the input end of the SVPWM rectifier; the output end of the SVPWM rectifier is fed to the control board; and the control board sends out six paths of PWM pulses and drives the switching board to drive a power switching tube in the SVPWM rectifier. The alternating current to direct current conversion device is stable in output direct current voltage, high in power factor, low in current distortion and low in pollution to the power grid, and energy can flow in two directions.
Description
Technical field
The invention belongs to a kind of ac-dc conversion device, be specifically related to a kind of ac-dc conversion device being applied to medium frequency converter.
Background technology
At present, medium frequency converter front end ac-dc conversion (AC/DC) device in commercial Application, the rectifier major part of AC/DC device adopts diode rectification or silicon controlled rectifier mode, rectifier power factor is low, current distortion degree is large, relatively more serious to electric network pollution, and energy can not two-way flow.The problem that rectifier power factor is low in order to solve, current distortion degree is large, mainly contains several settling mode, such as multiplex, install power factor compensation device etc. additional, but multiplex mode complicated structure, install power factor compensation device cost compare additional high.PWM (pulse width modulation) rectifier can realize unity power factor control, and current distortion degree is little.PWM rectifier is higher due to switching frequency, in the operational environment that electromagnetic interference is very serious, is easily disturbed.
Summary of the invention
The present invention proposes in order to the shortcoming overcoming prior art, its objective is and provides a kind of ac-dc conversion device being applicable to medium frequency converter.
Technical scheme of the present invention is: a kind of ac-dc conversion device of medium frequency converter, comprises main switch, isolating transformer, charging resistor, short circuit contactor, SVPWM(space vector pulse width modulation) rectifier, control board and driving keyset.Three-phase alternating current Netcom crosses main switch and is connected with the primary side of isolating transformer, and the secondary side joint charging resistor of isolating transformer and control board, charging resistor is in parallel with short circuit contactor.The input of another termination SVPWM rectifier of charging resistor, the output of SVPWM rectifier feeds back to control board, and control board sends six road pwm pulses, by driving the Intelligent Power Module in keyset driving SVPWM rectifier.
Described SVPWM rectifier is included in isolating transformer secondary side A, B phase and seals in current sensor respectively, isolating transformer secondary side linked reactor, and the other end of reactor receives the mid point of Intelligent Power Module respectively.The top of three groups of Intelligent Power Module is parallel to the anode connecing DC electrolysis electric capacity together, the bottom of three groups of Intelligent Power Module is also to the negative terminal connecing DC electrolysis electric capacity together, three groups of each cluster film Absorption Capacitances in parallel of intelligent object, isolating transformer secondary side A phase is connected A phase voltage transducer with in the middle of center line N.Three-phase alternating current filter capacitor connects the secondary side of isolating transformer respectively, and the other end connects the star-like connection of composition, and ac filter electric capacity and reactor and prime isolating transformer form a T-shaped filter, form a line filter.
Described control board comprises power module, digital signal processor, direct voltage Acquisition Circuit, hardware phase lock high precision loop circuit, voltage zero-crossing detection circuit, I/O interface circuit, precharge control circuit, PWM drive change-over circuit, failure detector circuit and current conversion circuit, wherein power module provides power supply to control board, and remaining circuit is communicated with digital signal processor respectively.
Beneficial effect of the present invention:
Output dc voltage is stable, power factor is high, current distortion degree is little, little to electric network pollution, and energy capable of bidirectional flowing.The HF switch amount of rear class inverter and PWM rectifier effectively can be suppressed whole electrical network grounding interference, strengthen system reliability.Effective avoiding device initially powers on, and line voltage instantaneous mutation destroys the temporary impact of power device, and the both end voltage of power device is slowly increased.
Accompanying drawing explanation
Fig. 1 is the ac-dc conversion device block diagram of medium frequency converter of the present invention;
Fig. 2 is SVPWM rectifier main circuit of the present invention;
Fig. 3 is control board pie graph of the present invention;
Fig. 4 is current conversion circuit figure;
Fig. 5 is that voltage zero-cross detects and hardware phase-locked-loop circuit diagram;
Fig. 6 is that PWM drives built-up circuit figure;
Fig. 7 is direct voltage Acquisition Circuit figure;
Fig. 8 is failure detector circuit figure;
Fig. 9 is I/O interface circuit figure;
Figure 10 is pre-charge circuit figure.
Wherein:
1 main switch 2 isolating transformer
3 charging resistor 4 short circuit contactor
5 SVPWM rectifier 6 control boards
7 drive keyset 8 ac filter electric capacity
9 reactor 10 Intelligent Power Module
11 DC electrolysis electric capacity 12 current sensors
13 voltage sensor 14 film absorption electric capacity
15 power module 16 digital signal processors
17 DC voltage conversion circuit 18 phase-locked loop circuits
19 voltage zero-crossing detection circuit 20 I/O interface circuit
21 precharge control circuit 22 PWM drive change-over circuit
23 failure detector circuit 24 current conversion circuits
25,27,34,39,43 No. one ~ No. five terminals
26,28 No. one, No. two operational amplifiers No. 29 comparators
30 inverter 31 phase-locked loops
No. 32 inverters (OC door) 33 No. two inverters (COMS)
35 small-signal isolated amplifier 36 voltage-stabiliser tubes
37 No. two comparators 38 and door
40 photoelectrical coupler 41 large driven current density devices
42 triodes
Embodiment
Below, in conjunction with the accompanying drawings and embodiments the ac-dc conversion device of medium frequency converter of the present invention is described in detail:
As shown in Figure 1, a kind of ac-dc conversion device of medium frequency converter, comprises main switch 1, isolating transformer 2, charging resistor 3, short circuit contactor 4, SVPWM rectifier 5, control board 6 and drives keyset 7.Three-phase alternating current Netcom crosses main switch 1 and is connected with the primary side of isolating transformer 2, the secondary side joint charging resistor 3 of isolating transformer 2 and control board 6, charging resistor 3 is in parallel with short circuit contactor 4, the input of another termination SVPWM rectifier 5 of charging resistor 3, the output of SVPWM rectifier 5 feeds back to control board 6, control board 6 is by detection of grid A, B phase current and direct voltage, carry out corresponding control algolithm, sending six road pwm pulses, driving power switch pipe in SVPWM rectifier 5 by driving keyset 7.
Wherein, isolating transformer 2 is for isolating PWM rectifier and rear class inverter high frequency open pipe signal to the interference of electrical network ground wire, and SVPWM rectifier 5 mainly realizes AC/DC power conversion.
As shown in Figure 2, described SVPWM rectifier 5 comprises ac filter electric capacity 8, reactor 9, Intelligent Power Module 10, DC electrolysis electric capacity 11, current sensor 12, voltage sensor 13 and film absorption electric capacity 14.Connect as follows between each device: in isolating transformer 2 secondary side A, B phase, seal in current sensor 12 respectively, isolating transformer 2 secondary side linked reactor 9, the other end of reactor 9 receives the mid point of Intelligent Power Module 10 respectively, the top of three groups of Intelligent Power Module 10 is parallel to the anode connecing DC electrolysis electric capacity 11 together, the bottom of three groups of Intelligent Power Module 10 to the negative terminal connecing DC electrolysis electric capacity 11 together, three groups of each cluster film Absorption Capacitances 14 in parallel of intelligent object 10.Isolating transformer 2 secondary side A phase is connected A phase voltage transducer 13 with in the middle of center line N, three-phase alternating current filter capacitor 8 connects the secondary side of isolating transformer 2 respectively, the other end connects the star-like connection of composition, ac filter electric capacity 8 forms a T-shaped filter with reactor 9 and prime isolating transformer 2, forms a line filter.
As shown in Figure 3, described control board 6 comprises power module 15, digital signal processor 16, direct voltage Acquisition Circuit 17, hardware phase lock high precision loop circuit 18, voltage zero-crossing detection circuit 19, I/O interface circuit 20, precharge control circuit 21, PWM drive change-over circuit 22, failure detector circuit 23 and current conversion circuit 24, wherein power module 15 provides power supply to control board 6, and remaining circuit is communicated with digital signal processor 16 respectively.
Power module 15 selects MORNSUN power module, comprise 15V/ ± 15V, 5V/5V2, 15/VCC, wherein ± 15V is that all analog chips are powered, 5V2 is that DC conversion modules high accuracy isolated amplifier is powered, VCC is that in digital signal processor 16 and control board, digit chip is powered, + 15V powers for driving keyset, digital signal processor 16 inside completes 5V/3.3V conversion, digital signal processor 16 is control cores, realize all peripheral signal to connect, digital signal processor 16 realizes the feedback of analog signal by the collection of direct voltage and input side electric current, hardware phase lock high precision loop circuit and Zero-cross comparator circuit realiration rectifier Phase synchronization, PWM drives change-over circuit to realize the conversion of IGBT drive singal, pre-charge circuit realizes the control of rectifier charging circuit, I/O interface circuit 20 realizes the communication of all digital quantity signals of rectifier.TI company's T MS320LF2407 selected by digital signal processor 16.
As shown in Figure 4, the annexation of described current conversion circuit 24 is as follows: R1 connects 2 pin of a wiring terminal 25, the other end is connected with R2, C1, the C1 other end is connected with 1 pin of AGND and No. one terminal 25,2 pin, R4, C2 of the R2 other end and an operational amplifier 26 are connected, and 1 pin, the R5 of the R4 other end, the C2 other end and an operational amplifier 26 are connected.The R5 other end is connected with R6,6 pin of an operational amplifier 26, R8, another termination 3.3VA of R6, the other end of R8 is connected with 7 pin of an operational amplifier 26, R9, the other end of R9 is connected with R10,13 pin of an operational amplifier 26, R10, the other end of R10 is connected with 14 pin of an operational amplifier 26, R12, and the R12 other end connects 10 pin of an operational amplifier 26.9 pin, 8 pin of an operational amplifier 26 are connected with R13, the R13 other end is connected with R14, C3, D2 negative electrode, D1 anode, the R14 other end, the C3 other end, D2 anode are connected with AGND, D1 negative electrode is connected with 3.3VA, and R3 one end is connected with 3 pin of an operational amplifier 26, another termination AGND, R7 is connected with 5 pin of an operational amplifier 26, R7 another termination AGND, R11 are connected with 12 pin of an operational amplifier 26, another termination AGND.
As shown in Figure 5, voltage zero-crossing detection circuit 19 and hardware phase lock high precision loop circuit 18 comprise low-pass filtering, high-pass filtering, sluggish zero-crossing comparator and hardware phase lock high precision loop circuit, its annexation is as follows: R15 is connected with 2 pin of No. two terminals 27, the other end is connected with R16, C5, the R16 other end is connected with 3 pin of C4, No. two operational amplifiers 28,1 pin, C26, R18 of another termination AGND, C5 other end of C4 and No. two operational amplifiers 28 are connected.2 pin of the R18 other end and No. two operational amplifiers 28, R17 connects, another termination AGND of R17, the C6 other end and C7, R19 connects, the C7 other end and R21, 5 pin of No. two operational amplifiers 28 connect, another termination AGND of R21, 7 pin of the R19 other end and No. two operational amplifiers 28, R22, R23 connects, 6 pin of the R22 other end and No. two operational amplifiers 28, R20 connects, another termination AGND of R20, 3 pin of the R23 other end and a comparator 29, R25 connects, another terminating diode of R25 D3 negative electrode, D3 anode connects 1 pin of comparator 29, R26, C8, D4 negative electrode, R27, another termination VCC of R26, D4 anode and another termination GND of C8, 1 pin of another termination inverter 30 of R27, 2 pin of inverter 30, C9, R28 connects, the R28 other end and R29, 14 pin of phase-locked loop 31 connect, another short circuit of the C9 other end and R29 is connected and meets GND, C10 is connected in parallel on 6 pin of phase-locked loop 31, 7 pin.11 pin of R30 mono-termination phase-locked loop 31, another termination GND, 8 pin of phase-locked loop 31 meet GND, 13 pin of R31 mono-termination phase-locked loop 31,9 pin of another termination R32, phase-locked loop 31, the R32 other end is connected with C11, another termination GND of C11,4 pin of phase-locked loop 31 connect CAP1 mouth and the IOPB7 mouth of DSP, and 3 pin of phase-locked loop 31 connect the IOPB4 mouth of DSP, and 16 pin of phase-locked loop 31 meet 3.3V.
As shown in Figure 6, described PWM drives change-over circuit 22, other 5 road PWM drives change-over circuit just the same, its inner annexation is as follows: the PWMU mouth of DSP is connected with R34, R33, and another termination GND, R33 other end of R34 is connected with 1 pin of C12, an inverter 32, another termination GND of C12,2 pin of an inverter (OC door) 32 are connected with 3 pin of R35, No. two inverters (COMS) 33, and 2 pin of No. two inverters 33 are connected with C13, R36, another termination GND of C13.
As shown in Figure 7, described direct voltage Acquisition Circuit 17, mainly select small-signal isolated amplifier to carry out direct voltage isolation to gather, its inner annexation is as follows: 2 pin of No. three terminals 34 meet R39, the R39 other end and R40, D6 negative electrode, D5 anode, 23 pin of small-signal isolated amplifier 35 connect, D5 negative electrode connects 21 pin of small-signal isolated amplifier 35, D6 anode, 1 pin of small-signal isolated amplifier 35, D6 anode, the R40 other end is connected with 1 pin of No. three terminals 34, 13 pin of small-signal isolated amplifier 35 are connected with R37, the R37 other end and R38, C14, D8 negative electrode connects, D8 anode, the C14 other end, the R38 other end is connected with 16 pin of small-signal isolated amplifier 35.9 pin of small-signal isolated amplifier 35 are connected to after potentiometer W1 centre cap and W1 shorted on one end, the potentiometer W1 other end is connected with 10 pin of small-signal isolated amplifier 35, the centre cap of potentiometer W2 is connected to 11 pin of small-signal isolated amplifier 35, other two terminals of W2 are each to be connected with 12 pin of small-signal isolated amplifier 35,16 pin respectively, 6 pin of small-signal isolated amplifier 35 meet VDD2,7 pin meet GND2, and D7 negative electrode is connected with 3.3VA.
As shown in Figure 8, described failure detector circuit 23, its inner annexation is as follows: R41 ~ R43, voltage-stabiliser tube 36, C15 form a voltage stabilizing circuit, export as overvoltage crowbar reference voltage level.R41 mono-termination VDD1, another termination R42, 1 pin of voltage-stabiliser tube 36, C15, 6 pin and the R43 of the C15 other end and voltage-stabiliser tube 36 are connected to AGND, the R43 other end and the R42 other end, 2 pin of voltage-stabiliser tube 36 connect, 1 pin of voltage-stabiliser tube 36 exports as reference voltage VREF, R44 meets VREF, 3 pin of another termination No. 2 comparators 37, C16, R45 mono-termination direct voltage VBUS1, another termination C17, the other end of C16, 2 pin of comparator 37, another termination AGND of C17, 1 pin of comparator 37, R46, D9 negative electrode, R47 connects, the R47 other end is connected with C18 and exports as overvoltage protection signal DCOV, DCOV is connected to 1 pin with door 38, 2 pin, ERR and R50, R51 connects, the other end of R51 connects 8 pin with door 38, C19 connects, be connected with 9 pin R48 of door 38, R49, C20 connects and composes capacitance-resistance filter and is connected the XINT1 pin exporting DSP to the other end of R48, the other end of R49, the C19 other end, the C20 other end is connected to GND.
As shown in Figure 9, described I/O interface circuit 20, its inner annexation is as follows: 2 pin of L1 mono-termination No. four terminals 39, the other end is connected with R52, the R52 other end and C21, D10 negative electrode, 1 pin of photoelectrical coupler 40 connects, 2 pin of photoelectrical coupler 40 and D10 anode, the C21 other end, 1 pin of No. four terminals 39 is connected to GND1, 3 pin of photoelectrical coupler 40 meet GND, 4 pin of photoelectrical coupler 40 meet R53, R54, the R54 other end and R55, D12 negative electrode, D11 anode, C22 is connected to the QT mouth of DSP, the other end of R55, D12 anode, another termination GND of C22, D11 negative electrode meets 3.3V.
As shown in Figure 10, described precharge control circuit 21, its inner annexation is as follows: 1 pin of large driven current density device 41, 2 pin connect the RLYDRV mouth of DSP, 3 pin of large driven current density device 41 and the anode of D13 are connected to 3 pin of No. five terminals 43, D13 negative electrode and VCC are connected to 1 pin of No. five terminals 43, 2 pin of No. five terminals 43 and R58, R56 connects, the R58 other end and voltage-stabiliser tube ZD1 negative electrode, C23, R57 connects, the R57 other end and R59, the base stage of triode 42 connects, the other end of R59 and the C23 other end, the R56 other end, ZD1 anode, triode emission level is connected to GND, transistor collector and R60, R61 connects, the R60 other end and D15 negative electrode, D14 anode is connected to the RLYFBK mouth of DSP, D15 anode meets GND, D14 negative electrode meets 3.3V, another termination 3.3V of R61.
The present invention has the following advantages:
I () adopts SVPWM rectifier, DC voltage stability, power factor are high, current distortion degree is little, little to electric network pollution, and energy capable of bidirectional flowing.
(II) AC/DC device front end installs isolating transformer additional, can effectively suppress the HF switch amount of rear class inverter and PWM rectifier to whole electrical network grounding interference, strengthens system reliability.
The setting of charging resistor in (III) device, can effectively initially power on by avoiding device, electrical network instantaneous mutation destroys the temporary impact of power device, and the both end voltage of power device is slowly increased.
Claims (1)
1. the ac-dc conversion device of a medium frequency converter, comprise main switch (1), isolating transformer (2), charging resistor (3), short circuit contactor (4), SVPWM rectifier (5), control board (6) and driving keyset (7), it is characterized in that: three-phase alternating current Netcom crosses main switch (1) and is connected with the primary side of isolating transformer (2), the secondary side joint charging resistor (3) of isolating transformer (2) and control board (6), charging resistor (3) is in parallel with short circuit contactor (4), the input of another termination SVPWM rectifier (5) of charging resistor (3), the output of SVPWM rectifier (5) feeds back to control board (6), control board (6) sends six road pwm pulses, by driving the Intelligent Power Module (10) in keyset (7) driving SVPWM rectifier (5),
Described SVPWM rectifier (5) is included in isolating transformer (2) secondary side A, B phase seals in respectively current sensor (12), isolating transformer (2) secondary side linked reactor (9), the other end of reactor (9) receives the mid point of three groups of Intelligent Power Module (10) respectively, the top of three groups of Intelligent Power Module (10) is parallel to the anode connecing DC electrolysis electric capacity (11) together, the bottom of three groups of Intelligent Power Module (10) is also to the negative terminal connecing DC electrolysis electric capacity (11) together, three groups of each cluster film Absorption Capacitances (14) in parallel of Intelligent Power Module (10), isolating transformer (2) secondary side A phase is connected A phase voltage transducer (13) with in the middle of center line N, three-phase alternating current filter capacitor (8) connects the secondary side of isolating transformer (2) respectively, the other end connects the star-like connection of composition, ac filter electric capacity (8) forms a T-shaped filter with reactor (9) and prime isolating transformer (2), form a line filter,
Described control board (6) comprises power module (15), digital signal processor (16), direct voltage Acquisition Circuit (17), hardware phase lock high precision loop circuit (18), voltage zero-crossing detection circuit (19), I/O interface circuit (20), precharge control circuit (21), PWM driving change-over circuit (22), failure detector circuit (23) and current conversion circuit (24), wherein power module (15) provides power supply to control board (6), and remaining circuit is communicated with digital signal processor (16) respectively.
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| CN201210357486.5A CN102832833B (en) | 2012-09-24 | 2012-09-24 | Alternating current to direct current conversion device of intermediate frequency converter |
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| CN201210357486.5A CN102832833B (en) | 2012-09-24 | 2012-09-24 | Alternating current to direct current conversion device of intermediate frequency converter |
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| CN102832833B true CN102832833B (en) | 2015-07-15 |
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Families Citing this family (4)
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| WO2014186933A1 (en) * | 2013-05-20 | 2014-11-27 | Ge Energy Power Conversion Technology Ltd. | Input filter pre-charge fed by a medium-voltage grid supply |
| CN105529972A (en) * | 2016-02-24 | 2016-04-27 | 核工业理化工程研究院 | Detection circuit for intermediate-frequency low current |
| CN105553346A (en) * | 2016-02-24 | 2016-05-04 | 核工业理化工程研究院 | Buck-type DC conversion device |
| CN108512437A (en) * | 2018-03-29 | 2018-09-07 | 核工业理化工程研究院 | A kind of frequency quick adjustable frequency converter and control method |
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