CN203747685U - DSP based three-level space vector modulating system - Google Patents
DSP based three-level space vector modulating system Download PDFInfo
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- CN203747685U CN203747685U CN201420034134.0U CN201420034134U CN203747685U CN 203747685 U CN203747685 U CN 203747685U CN 201420034134 U CN201420034134 U CN 201420034134U CN 203747685 U CN203747685 U CN 203747685U
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Abstract
The utility model relates to a DSP based three-level space vector modulating system, which comprises a three-phase AC power supply, a voltage regulator, a transformer, a main circuit and a control circuit, wherein the main circuit comprises a diode rectifier bridge, a three-level inverter bridge and a driving circuit, two sides of the diode rectifier bridge are connected with the three-level inverter bridge and the voltage regulator respectively, the three-level inverter bridge is connected with the control circuit, and the control circuit is connected with the driving circuit. The DSP based three-level space vector modulating system can realize modulation for a three-level space vector, solves a problem of sudden changes in output vector because of the output vector of a previous two-level circuit cannot switch smoothly, greatly improves the utilization ratio of DC voltage, reduces the production and design cost of an APF, and improves the high reliability and the industrial applicability of the APF.
Description
Technical field
The utility model relates to three-level inverter, relates in particular to the 3 level space vector modulating system based on DSP in three-level inverter.
Background technology
Three-level VSI shows obvious advantage with respect to traditional two level PWM voltage source inverters in high-power application, the advantage of the output performance of voltage source inverter depends primarily on modulation algorithm, space voltage vector modulation technique (SVPWM) maturation, voltage utilization advantages of higher, is widely used.Voltage vector in space vector modulating method sends in sequence, starting voltage vector all adopts positive small vector, therefore can in sector switch, ensure taking over seamlessly of output vector, prevent the sudden change of output vector, also avoid the low problem of direct voltage utilance simultaneously.
Utility model content
The purpose of this utility model is in order to solve the problems of the technologies described above, and a kind of 3 level space vector modulating system based on DSP is provided.
The purpose of this utility model is achieved through the following technical solutions:
A kind of 3 level space vector modulating system based on DSP, wherein, comprise three-phase alternating-current supply, voltage regulator, transformer, main circuit and control circuit, described main circuit comprises diode rectifier bridge, three-level inverters and drive circuit, diode rectifier bridge both sides are connected with three-level inverters, voltage regulator respectively, three-level inverters is connected with control circuit, and control circuit is connected with drive circuit.
The above-mentioned 3 level space vector modulating system based on DSP; wherein; described control circuit is core board based on DSP inverter and the circuit of conditioning plate, is mainly used in that electric circuit inspection, control algolithm calculating, DSP inverter function setting, PWM drive that signal generates, the realization of defencive function etc.
The above-mentioned 3 level space vector modulating system based on DSP, wherein, described dsp controller is TMS320F28335 type digital signal processor.
The above-mentioned 3 level space vector modulating system based on DSP, wherein, described DSP inverter comprises A/D ALT-CH alternate channel and two event manager module EVA, EVB, threephase load electric current and voltage signal are sent into the A/D ALT-CH alternate channel of dsp controller after diode rectifier bridge, three-level inverters conversion, by inner integrated two the event manager module EVA of dsp controller and EVB, the PWM that produces 12 main switch IGBT of three-level inverter drives signal.
The above-mentioned 3 level space vector modulating system based on DSP, wherein, the clamp circuit that described three-level inverters is made up of multiple IGBT.
The above-mentioned 3 level space vector modulating system based on DSP, wherein, also comprises large electrochemical capacitor and damping resistance, and large electrochemical capacitor and damping resistance are all in parallel with diode rectifier bridge respectively.
The above-mentioned 3 level space vector modulating system based on DSP, wherein, adopts M57962 to drive chip as the optocoupler of drive circuit.
The utility model can be realized the modulation of 3 level space vector, before having solved, two level circuit output vectors can not take over seamlessly the problem of the output vector sudden change causing, greatly improve direct voltage utilance, reduce the cost of APF Production design, improved high reliability and the industrial applicibility of APF.
Brief description of the drawings
Fig. 1 is the schematic diagram of the 3 level space vector modulating system of the utility model based on DSP.
Fig. 2 is the circuit diagram of the 3 level space vector modulating system of the utility model based on DSP.
Fig. 3 is the circuit diagram of the three-level inverters of the 3 level space vector modulating system of the utility model based on DSP.
Fig. 4 is the circuit diagram of the drive circuit of the 3 level space vector modulating system of the utility model based on DSP.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.
Refer to Fig. 1, Fig. 2, Fig. 3, a kind of 3 level space vector modulating system based on DSP, comprise three-phase alternating-current supply, voltage regulator, transformer, main circuit and control circuit, described main circuit comprises diode rectifier bridge, three-level inverters and drive circuit, diode rectifier bridge both sides are connected with three-level inverters, voltage regulator respectively, three-level inverters is connected with control circuit by data wire, and control circuit is connected with drive circuit.
Control circuit is core board based on DSP inverter and the circuit of conditioning plate, is mainly used in electric circuit inspection, control algolithm calculating, DSP inverter function setting, PWM and drives the realization of signal generation, defencive function etc.,
The clamp circuit that three-level inverters is made up of multiple IGBT, dsp controller is TMS320F28335 type digital signal processor.
The reverse voltage that clamp diode bears is the half of DC bus-bar voltage, in the occasion of high-power, reverse shutoff voltage and operating current that the power switch pipe of three-level inverter bears are generally larger, but operating frequency is generally not high, conventionally only having several KHz, is proper so choose IGBT as the switching tube of three-level inverter.
In order to reduce the ripple undulate quantity of direct voltage after rectification and to prevent voltage current impact, in circuit, also comprise large electrochemical capacitor and large resistance, large electrochemical capacitor and large resistance are all in parallel with diode rectifier bridge respectively.
Threephase load electric current and voltage signal are sent into the A/D ALT-CH alternate channel of dsp controller after diode rectifier bridge, three-level inverters conversion, by inner integrated two the event manager module EVA of dsp controller and EVB, the PWM that produces 12 main switch IGBT of three-level inverter drives signal.First sampling, then, according to institute's sampled value control DC voltage soft start, then judges that whether voltage signal is synchronous.Realize neutral point balance by algorithm, calculate and need offset current, offset current as required carrys out modulation (PWM), then realizes by drive circuit.
The basic function of drive circuit is to improve the driving force that core board provides PWM to drive signal, reaches the requirement that drives IGBT, and realizes the isolation of control circuit and main circuit, and whole drive circuit as shown in Figure 4.
AC current-voltage, direct current voltage are all realized by control circuit, realize AC current-voltage, direct current voltage sample and variation by control circuit.Whole driving process is the output signal that original pwm signal that high/low level is respectively to ten 5V and 0V changes be respectively+15V of high/low level and a 9V into, directly drives IGBT.The utility model adopts M57962 to drive chip as optocoupler, and M57962 possesses voltage failure measuring ability, if detecting that power tube both end voltage is undesired can send fault-signal automatically, so that protect.
The utility model can be realized the modulation of 3 level space vector, before having solved, two level circuit output vectors can not take over seamlessly the problem of the output vector sudden change causing, greatly improve direct voltage utilance, reduce the cost of APF Production design, improved high reliability and the industrial applicibility of APF.
Claims (7)
1. the 3 level space vector modulating system based on DSP, it is characterized in that, comprise three-phase alternating-current supply, voltage regulator, transformer, main circuit and control circuit, described main circuit comprises diode rectifier bridge, three-level inverters and drive circuit, diode rectifier bridge both sides are connected with three-level inverters, voltage regulator respectively, three-level inverters is connected with control circuit, and control circuit is connected with drive circuit.
2. the 3 level space vector modulating system based on DSP according to claim 1, is characterized in that, described control circuit is core board based on DSP inverter and the circuit of conditioning plate.
3. the 3 level space vector modulating system based on DSP according to claim 2, is characterized in that, described dsp controller is TMS320F28335 type digital signal processor.
4. the 3 level space vector modulating system based on DSP according to claim 2, is characterized in that, described DSP inverter comprises A/D ALT-CH alternate channel and two event manager module EVA, EVB.
5. the 3 level space vector modulating system based on DSP according to claim 1, is characterized in that the clamp circuit that described three-level inverters is made up of multiple IGBT.
6. the 3 level space vector modulating system based on DSP according to claim 1, is characterized in that, also comprises large electrochemical capacitor and damping resistance, and large electrochemical capacitor and damping resistance are all in parallel with diode rectifier bridge respectively.
7. the 3 level space vector modulating system based on DSP according to claim 1, is characterized in that, adopts M57962 to drive chip as the optocoupler of drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420034134.0U CN203747685U (en) | 2014-01-21 | 2014-01-21 | DSP based three-level space vector modulating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420034134.0U CN203747685U (en) | 2014-01-21 | 2014-01-21 | DSP based three-level space vector modulating system |
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| Publication Number | Publication Date |
|---|---|
| CN203747685U true CN203747685U (en) | 2014-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420034134.0U Expired - Fee Related CN203747685U (en) | 2014-01-21 | 2014-01-21 | DSP based three-level space vector modulating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201922A (en) * | 2014-09-12 | 2014-12-10 | 东南大学 | Clamping-type three-phase voltage-source type inverter and control method thereof |
-
2014
- 2014-01-21 CN CN201420034134.0U patent/CN203747685U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201922A (en) * | 2014-09-12 | 2014-12-10 | 东南大学 | Clamping-type three-phase voltage-source type inverter and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140730 Termination date: 20170121 |