CN102843058B - All-digital three-phase medium frequency inverter based on DSP (Digital Signal Processor) - Google Patents
All-digital three-phase medium frequency inverter based on DSP (Digital Signal Processor) Download PDFInfo
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- CN102843058B CN102843058B CN201210357194.1A CN201210357194A CN102843058B CN 102843058 B CN102843058 B CN 102843058B CN 201210357194 A CN201210357194 A CN 201210357194A CN 102843058 B CN102843058 B CN 102843058B
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Abstract
The invention discloses an all-digital three-phase medium frequency inverter based on DSP (Digital Signal Processor) comprising IGBT (Insulated Gate Bipolar Translator) intelligent power modules, an LC (Launch Control) wave filter, a feedback transformer and a control panel, wherein three groups of IGBT intelligent power modules are connected in parallel and are connected to a DC (Direct Current) voltage, the midpoints of the three groups of IGBT intelligent power modules are respectively connected with a filter inductor of the LC wave filter, the other end of the filter inductor is connected with a filter capacitor, the other end of the filter capacitor is connected in parallel, the output end of the wave filter is connected with a load, the output end of the LC wave filter is connected on the primary side of the feedback transformer, and the feedback input port of the control panel is connected with the secondary side of the feedback transformer. The all-digital three-phase medium frequency inverter based on DSP disclosed by the invention has high control precision, good anti-interference capability, high calculation speed, simple control algorithm, stable output voltage, good dynamic adjustment property of the inverter and simple making technique, so that the all-digital three-phase medium frequency inverter is especially suitable for high-power medium frequency inverter.
Description
Technical field
The invention belongs to a kind of three-phase mid-frequency inverter, be specifically related to a kind of totally digitilized three-phase mid-frequency inverter based on digital signal processor (DSP), be specially adapted to powerful if inverter.
Background technology
Using Sinusoidal Pulse Width Modulation (SPWM) technology is the core technology that modern power electronic conversion controls, and is a kind of method the most common in commercial Application.The method that tradition produces SPWM signal mainly adopts application-specific integrated circuit (ASIC) to realize SPWM(as HEF4752, SA4828 etc.), master control system adopts chip microcontroller, although circuit system structure is fairly simple, but SCM anti-interference is poor, processing accuracy is low, especially for high-power medium-frequency inverting device, due to the problem of single-chip microcomputer precision, be easy to cause inverter output voltage waveform unstable.
Along with the extensive use of DSP, because DSP precision is high, computational speed is fast, anti-interference is good, adopt DSP to calculate in real time and generate SPWM pulse signal, simultaneously complete AD(analog digital in DSP inside) conversion, digital PI(proportional integral) control, whole inverter system only by take DSP as the control board of core and insulated gate bipolar transistor (IGBT) assembly, LC filter forms, system configuration is simple, and control precision is high.On the other hand, in inverter control method, for ensureing inverter dynamic conditioning performance and output stability, a lot of system adopts double-loop control, and inner ring is that current instantaneous value controls, and outer shroud is that voltage effective value controls.But for high-power medium-frequency inverting device, be subject to the restriction of the maximum switching frequency of high-power switch device IGBT, cause the carrier wave ratio N of SPWM inevitable very low, still adopt double-loop control that inverter output voltage certainly will be caused to fluctuate large, control stability poor.
Summary of the invention
The present invention proposes in order to the shortcoming overcoming prior art, its objective is and provides one to be applicable to the powerful totally digitilized three-phase mid-frequency inverter based on digital signal processor (DSP).
Technical scheme of the present invention is: a kind of totally digitilized three-phase mid-frequency inverter based on DSP, comprise IGBT Intelligent Power Module, LC filter, feedback transformer and control board. three groups of IGBT Intelligent Power Module are connected in parallel, connect direct voltage, the mid point of three groups of IGBT intelligent objects connects the filter inductance of LC filter respectively, the other end of filter inductance is connected with filter capacitor, the filter capacitor other end is connected in parallel, filter output connects load, feedback transformer primary side connects LC filter output, feedback transformer secondary side is connected to control board feed back input port.
Described control board comprises pulse width modulation (PWM) driving pulse change-over circuit, Voltage Feedback Acquisition Circuit, I/O interface circuit, fault secure circuit, digital signal processor (DSP) and power module.Wherein, power module provides power supply, and remaining circuit is all communicated with digital signal processor.
Described pwm pulse change-over circuit 7 comprises R1 and C1,1 pin of an inverter (OC door) is connected, the C1 other end is connected with GND, 2 pin of an inverter are connected with 3 pin of No. two inverters (CMOS door), R2, R2 other end connection+15V, 2 pin of No. two inverters are connected with C2, R3, another termination GND of C2.
Control precision of the present invention is high, anti-interference good, fast operation, and control algolithm is simple, and output voltage stabilization, inverter dynamic conditioning performance is good, and manufacture craft is simple, cost is low.
Accompanying drawing explanation
Fig. 1 is the totally digitilized three-phase mid-frequency inverter circuit diagram that the present invention is based on DSP;
Fig. 2 is control board circuit diagram of the present invention;
Fig. 3 is PWM driving pulse change-over circuit figure of the present invention;
Fig. 4 is Voltage Feedback Acquisition Circuit figure of the present invention;
Fig. 5 is I/O interface circuit of the present invention;
Fig. 6 is fault secure circuit figure of the present invention.
Wherein:
1 IGBT Intelligent Power Module 2 LC filter
3 feedback transformer 4 control boards
5 filter inductance 6 filter capacitors
7 PWM driving pulse change-over circuit 8 Voltage Feedback Acquisition Circuit
9 I/O interface circuit 10 fault secure circuits
No. 11 inverters 12 No. two inverters
13 operational amplifier 14 feedback voltage terminals
15 photoelectrical coupler 16 level translation doors
17 with door 18 NOR gate
19 digital signal processor 20 power modules.
Embodiment
Below, in conjunction with the accompanying drawings and embodiments the totally digitilized three-phase mid-frequency inverter that the present invention is based on DSP is described in detail:
As shown in Figure 1, a kind of totally digitilized three-phase mid-frequency inverter based on DSP, comprises IGBT Intelligent Power Module 1, LC filter 2, feedback transformer 3 and control board 4.Wherein, three groups of IGBT Intelligent Power Module 1 are connected in parallel, connect direct voltage (such as 600V), the mid point of three groups of IGBT intelligent objects 1 connects the filter inductance 5 of LC filter 2 respectively, the other end of filter inductance 5 is connected with filter capacitor 6, filter capacitor 6 other end is connected in parallel, and filter 2 output connects load.Feedback transformer 3 primary side connects LC filter 2 output, feedback transformer 3 secondary side is connected to control board 4 feed back input port, control board 4 is by detecting output voltage, utilize AD acquisition channel on DSP sheet, directly carry out direct voltage collection, and carry out corresponding s operation control, utilize dedicated PWM mouth on DSP sheet, produce six road pwm pulses, drive IGBT module.
As shown in Figure 2, described control board 4 comprises PWM driving pulse change-over circuit 7, Voltage Feedback Acquisition Circuit 8, I/O interface circuit 9, fault secure circuit 10, digital signal processor (DSP) 19 and power module 20.Wherein, power module 20 provides power supply, and remaining circuit is all communicated with digital signal processor 19.
DSP19 selects TI company's T MS320LF2407; Power module 20 selects MORNSUN power module, comprise+15V/VDD1 and+15VSS1 and+15V/VCC, wherein VDD1, VSS1 are that all analog chips are powered, VCC is that in DSP and control board, digit chip is powered, + 15V powers for driving keyset, dsp board inside completes 5V/3.3V conversion, and dsp board is control core, realizes all peripheral signal and connects.Voltage Feedback Acquisition Circuit completes the collection of inverter amplitude, and pwm pulse translation circuit realizes the conversion of IGBT drive singal, and I/O interface circuit realizes the communication of all digital signals, and fault secure circuit mainly realizes fault of converter and detects.
As shown in Figure 3, described pwm pulse change-over circuit 7 comprises R1 and C1,1 pin of an inverter (OC door) 11 is connected, the C1 other end is connected with GND, 2 pin of an inverter 11 are connected with 3 pin of No. two inverters (CMOS door) 12, R2, R2 other end connection+15V, 2 pin of No. two inverters 12 are connected with C2, R3, another termination GND of C2.This circuit is a road pwm pulse translation circuit, and other five roads circuit are identical.
As shown in Figure 4, described Voltage Feedback Acquisition Circuit 8, the annexation of its circuit is as follows: the three-phase output voltage of feedback transformer 3 secondary side is by 1 of terminal 14, 2, 3 pin are connected to D1 anode respectively, D2 anode, D3 anode, D1 negative electrode, D2 negative electrode, D3 negative electrode, C3, R4, R5 connects, D4 anode, D5 anode, D6 anode and the C3 other end, the R4 other end, R8 connects, D4 negative electrode is connected with D1 anode, D5 negative electrode is connected with D2 anode, D6 negative electrode is connected with D3 anode, the R5 other end and R6, R7, the R8 other end is connected in series, R6 and R7 common point is connected with R9, the R9 other end and D7 anode, D8 negative electrode, 12 pin of operational amplifier 13 connect, 13 pin of operational amplifier 13, 14 pin are connected with R10, the R10 other end and R11, C4, R12 connects, the R12 other end and D9 anode, D10 negative electrode connects, the R11 other end C4 other end and D10 anode are connected to AGND, D9 negative electrode is connected to 3.3VA.
As shown in Figure 5, described I/O interface circuit 9, its circuit connecting relation is as follows: exterior I O signal is connected by L1 and R13, the R13 other end is connected with C5, D11 negative electrode, 1 pin of photoelectrical coupler 15 connects, 2 pin of the C5 other end and D11 anode, photoelectrical coupler 15 are connected to GNDPLC, and 3 pin of photoelectrical coupler 15 are connected with R14, R15, and the R14 other end is connected to 3.3V, the R15 other end and C6 are connected to the I/O port of DSP, and 4 pin of the C6 other end and photoelectrical coupler 15 are connected to GND.The I/O signal circuit on other five tunnels is identical with Fig. 5.
As shown in Figure 6; described fault secure circuit 10; its circuit connecting relation is as follows: alarm signal ERR1, ERR2, ERR3 are connected to 1 pin, 2 pin, 8 pin of NOR gate 18 respectively by R19, R20, R21; C7, R16 are connected in series; 8 pin of its common point AND OR NOT gate 18 and 3 pin of level translation door 16 connect; C8, R17 are connected in series; 2 pin of its common point NOR gate 18 and 5 pin of level translation door 16 connect; C9, R18 are connected in series, and 1 pin of its common point AND OR NOT gate 18 and 7 pin of level translation door 16 connect.
Alarm signal ERR4, ERR5, ERR6 are connected to 5 pin, 4 pin, 3 pin of NOR gate 18 respectively by R25, R26, R27, R22 and C10 is connected in series, its common point is connected to 5 pin of NOR gate 18, R23 and C11 is connected in series, 4 pin of its common point AND OR NOT gate 18 connect, and R24 and C12 is connected in series, and 3 pin of its common point AND OR NOT gate 18 connect, 6 pin of NOR gate 18 are connected with 3 pin of door 17,9 pin of NOR gate 18 and being connected with 4 pin of door 17,5 pin.Be connected with 9 pin of R30, level translation door 16 with 6 pin of door 17, the R30 other end is connected with C14, R31, the R31 other end and being connected with 8 pin of door 17, be connected with STOP, PROTECTION signal respectively with 1 pin of door 17,2 pin, be connected with R28 through exporting with 9 pin of door 17, the R28 other end and R29, C13 are connected to the XINT2 mouth of DSP.
The C14 other end and the R29 other end, the C13 other end, the C10 other end, the C11 other end, the C12 other end, the C7 other end, the C8 other end, the C9 other end are connected to GND.The R16 other end, the R17 other end, the R18 other end, the R22 other end, the R23 other end, the R24 other end are connected to+15V, and 2 pin of level translation door 16,4 pin, 6 pin, 10 pin are connected to P1CO, P2CO, P3CO, the OT terminal of DSP respectively.
Maximum 300kW(cos φ=0.9 of power output of the present invention), capacity is about 330kVA, and output current is about 500A.
Control precision of the present invention is high, anti-interference good, fast operation, and control algolithm is simple, and output voltage stabilization, inverter dynamic conditioning performance is good, and manufacture craft is simple, cost is low.
Claims (1)
1. the totally digitilized three-phase mid-frequency inverter based on DSP, comprise IGBT Intelligent Power Module (1), LC filter (2), feedback transformer (3) and control board (4), it is characterized in that: three groups of IGBT Intelligent Power Module (1) are connected in parallel, connect direct voltage, the mid point of three groups of IGBT Intelligent Power Module (1) connects the filter inductance (5) of LC filter (2) respectively, the other end of filter inductance (5) is connected with filter capacitor (6), filter capacitor (6) other end is connected in parallel, filter (2) output connects load, feedback transformer (3) primary side connects LC filter (2) output, feedback transformer (3) secondary side is connected to control board (4) feed back input port,
Described control board (4) comprises PWM driving pulse change-over circuit (7), Voltage Feedback Acquisition Circuit (8), I/O interface circuit (9), fault secure circuit (10), digital signal processor (19) and power module (20), wherein power module (20) provides power supply, and remaining circuit is all communicated with digital signal processor (19);
Described PWM driving pulse change-over circuit (7) comprises R1 and C1,1 pin of an inverter (11) is connected, the C1 other end is connected with GND, 2 pin of an inverter (11) are connected with 3 pin of No. two inverters (12), R2, R2 other end connection+15V, 2 pin of No. two inverters (12) are connected with C2, R3, another termination GND of C2.
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| CN201210357194.1A CN102843058B (en) | 2012-09-24 | 2012-09-24 | All-digital three-phase medium frequency inverter based on DSP (Digital Signal Processor) |
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| CN201210357194.1A CN102843058B (en) | 2012-09-24 | 2012-09-24 | All-digital three-phase medium frequency inverter based on DSP (Digital Signal Processor) |
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| CN102843058B true CN102843058B (en) | 2015-07-15 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101075783A (en) * | 2007-06-01 | 2007-11-21 | 武汉大学 | Three-phase medium-frequency DC high-voltage power supply for ESP |
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| US20080186004A1 (en) * | 2005-11-29 | 2008-08-07 | Advanced Analogic Technologies, Inc. | High-Frequency Power MESFET Boost Switching Power Supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101075783A (en) * | 2007-06-01 | 2007-11-21 | 武汉大学 | Three-phase medium-frequency DC high-voltage power supply for ESP |
Non-Patent Citations (1)
| Title |
|---|
| 基于TMS320F2812中频开关电源的软件设计;王亭岭等;《微计算机信息》;20081231;第24卷(第34期);第190-192页 * |
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