CN104201925A - Three-phase inverter power supply based on digital signal processor (DSP) control - Google Patents
Three-phase inverter power supply based on digital signal processor (DSP) control Download PDFInfo
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- CN104201925A CN104201925A CN201410403972.5A CN201410403972A CN104201925A CN 104201925 A CN104201925 A CN 104201925A CN 201410403972 A CN201410403972 A CN 201410403972A CN 104201925 A CN104201925 A CN 104201925A
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Abstract
The invention discloses a three-phase inverter power supply based on digital signal processor (DSP) control. The power supply comprises three independent single-phase inverter modules and a DSP control module and a power frequency boosting transformer which are connected with the three single-phase inverter module, wherein the DSP control module comprises a DSP control chip, a direct current voltage detection circuit, an insulated gate bipolar translator (IGBT) alternating current detection circuit, an alternating current voltage detection circuit, an isolation driving and protection circuit, a sound and light alarm circuit and a recommended standard (RS) 485 communication circuit. Direct current input voltage is input into an IGBT full bridge inversion circuit of the single-phase inverter module, SPWM signals output by the DSP control chip is utilized to drive full bridge inversion and invert direct current into alternating current, and the alternating current is converted into power frequency alternating current through a power frequency boosting transformer to be output. The three-phase inverter power supply adopting the structure has the advantages of being high in efficiency, good in stability and high in expandability and the like.
Description
Technical field
The present invention relates to a kind of three-phase from net inverter power supply, particularly relate to a kind of three-phase inverter power supply of controlling based on DSP, belong to grid-connected power generation system control technology field.
Background technology
Solar energy power generating is the important content that comprises the long-term energy strategy of the multinational government support of China, and has been widely used, and inverter is the important component part in whole solar photovoltaic generation system.Inverter is pressed the classification of the output number of phases, can be divided into single-phase inverter and three-phase inverter.Single-phase inverter can be divided into half-bridge inverter and full-bridge inverter again by structure.Three-phase inverter can be divided into three-phase three-wire system inverter and three-phase four-wire system inverter again.During practical application, according to different occasions, select single-phase inverter or three-phase inverter.
Conventional three phase inverter, when threephase load balance, can obtain reasonable output characteristic.Yet under unbalanced load condition, due to power supply on circuit and magnetic circuit, all exist between phase and phase stronger coupled relation, and inverter output impedance and filtering impedance can not be zero.This just has influence on the symmetry of three phase mains output, and the degree of unbalance of load more has a strong impact on just larger.When different single, threephase load are powered by same three phase mains, this problem is just more outstanding.The asymmetric of phase place also causes the asymmetric of line voltage thereupon, thereby may cause adverse consequences to load, to cause some more sensitive equipment cisco unity malfunctions.
In view of this, the inventor studies this, develops specially a kind of three-phase inverter power supply of controlling based on DSP, and this case produces thus.
Summary of the invention
The object of this invention is to provide a kind of three-phase inverter power supply of controlling based on DSP, have perfect overvoltage/undervoltage, overload, short circuit, overheat protector and warning function, whole power-efficient is high, good stability, and extensibility is strong.
To achieve these goals, solution of the present invention is:
A kind of three-phase inverter power supply of controlling based on DSP, comprise 3 separate single-phase inverter modules, and the DSP control module and the duplex frequency boostering transformer that are connected with 3 single-phase inverter modules respectively, wherein, described DSP control module comprises DSP control chip, the direct voltage testing circuit being connected with DSP control chip input, IGBT alternating current testing circuit, ac voltage detection circuit, the isolation drive and the protective circuit that are connected with DSP control chip output, sound light alarming circuit, described DSP control module further comprises a RS485 telecommunication circuit, for DSP control chip, communicate by letter with host computer, DC input voitage is input to the IGBT full bridge inverter of single-phase inverter module, the SPWM signal driver full-bridge inverting of being exported by DSP control chip, inverse of the DC into AC, alternating current is transformed into industrial frequency AC output through duplex frequency boostering transformer again.
As preferably, above-mentioned DSP control chip adopts the dsp chip that model is DSPIC33.
As preferably; above-mentioned direct voltage testing circuit comprises the sampling resistor of several mutual series connection; and the operational amplifier being connected with sampling resistor, direct voltage testing circuit is mainly for detection of DC input voitage, in DC input voitage overvoltage or starting protection action when under-voltage.
As preferably, above-mentioned IGBT alternating current testing circuit comprises connected successively Hall current sensor, sampling resistor and operational amplifier, IGBT alternating current testing circuit, mainly for detection of the alternating current after single-phase inverter module I GBT full bridge inverter, carries out current loop control according to the current value detecting.
As preferably, above-mentioned ac voltage detection circuit comprises AC voltage transformer, and the operational amplifier being connected with AC voltage transformer, ac voltage detection circuit, mainly for detection of the voltage after duplex frequency boostering transformer boosts, carries out Voltage loop control according to the magnitude of voltage detecting.
As preferably; isolation drive and protective circuit comprise 4 parallel circuits that drive respectively the IGBT of each IGBT full bridge inverter of protection; each parallel circuit includes optocoupler; and the triode being connected with optocoupler and diode; the SPWM signal of DSP control chip output drives through light-coupled isolation; the totem forming through two triodes again and two clamping protective circuit that diode forms, the SPWM signal of output, through isolating and increasing after driving force, is input to the grid level of IGBT.
As preferably, RS485 telecommunication circuit comprises RS485 communication chip, and the light-emitting diode being connected with RS485 communication chip, the UART Universal Asynchronous Receiver Transmitter of DSP control chip is connected with the sending and receiving port of RS485 communication chip, according to certain baud rate and communication protocol, DSP control module just can communicate with host computer.
As preferably, above-mentioned sound light alarming circuit comprises buzzer and light-emitting diode, by both combinations, realizes sound and light of alarm.
The operation principle of the above-mentioned three-phase inverter power supply of controlling based on DSP: each single-phase inverter module of the present invention is all independently-powered, independent control, can operate separately in a single-phase inverter power supply, also can three modules be operated in together in three-phase inverter power supply.DSP control module is by single-phase inverter module for power supply, and each single-phase inverter module can be to the power supply of DSP control module, and the DSP while ensureing as single-phase inverter power supply of usining can normally work.DSP control chip is exported 12 road SPWM and is driven signal, through light-coupled isolation, drive the full-bridge inverting part of each single-phase inverter module, three single-phase inverter module alternating currents after IGBT full-bridge inverting, again through transformer coupled boosting of three-phase main-frequency, obtain final three-phase main-frequency output voltage.The SPWM waveform of DSP control chip output adopts bipolarity, and ambipolar SPWM ripple makes output harmonic wave number of times high, is convenient to like this design of LC filtering parameter, has reduced the capacity of L simultaneously.DSP control chip is by direct voltage testing circuit, IGBT alternating current testing circuit, ac voltage detection circuit simultaneously, A/D port by collection of simulant signal such as the voltage of needs monitoring, electric current, temperature to DSP control chip, through DSP control chip inter-process, convert, if monitored value is abnormal, adjust SPWM output signal, trigger buzzer warning and/or diode displaying simultaneously.
The above-mentioned three-phase inverter power supply architecture of controlling based on DSP is simple, easy to use and flexible, can select three-phase or single-phase application, with low cost, DSP control module system adopts voltage, double current loop modulation, quick by current inner loop, performance of noiseproof improves output waveform timely, utilize the transformation of current inner loop to controlled device simultaneously, can greatly simplify the design of outer voltage, output voltage adopts repetitive control to carry out the impact of the periodic vibrations such as deadband eliminating effect and nonlinear load, improve the waveform quality of output voltage, there is perfect overvoltage/undervoltage, overload, short circuit, overheat protector and warning function, whole power-efficient is high, good stability, extensibility is strong.
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the three-phase inverter power supply architecture schematic diagram of the present embodiment;
Fig. 2 is the DSP control module block diagram of the present embodiment;
Fig. 3 is the DSP control chip circuit theory diagrams of the present embodiment;
Fig. 4 is the direct voltage testing circuit schematic diagram of the present embodiment;
Fig. 5 is the IGBT alternating current testing circuit schematic diagram of the present embodiment;
Fig. 6 is the ac voltage detection circuit schematic diagram of the present embodiment;
Fig. 7 is isolation drive and the protective circuit schematic diagram of the present embodiment;
Fig. 8 is the sound light alarming circuit schematic diagram of the present embodiment;
Fig. 9 is the RS485 telecommunication circuit schematic diagram of the present embodiment.
Embodiment
As shown in Figure 1-2, a kind of three-phase inverter power supply of controlling based on DSP, comprise 3 separate single-phase inverter modules 1, and the DSP control module 2 being connected with 3 single-phase inverter modules 1 respectively and duplex frequency boostering transformer 3, wherein, described DSP control module 2 comprises DSP control chip 21, the direct voltage testing circuit 22 being connected with DSP control chip 21 inputs, IGBT alternating current testing circuit 23, ac voltage detection circuit 24, the isolation drive and the protective circuit 25 that are connected with DSP control chip 21 outputs, sound light alarming circuit 26, described DSP control module 2 further comprises a RS485 telecommunication circuit 27, for DSP control chip 21, communicate by letter with host computer, DC input voitage is input to the IGBT full bridge inverter of single-phase inverter module 1, SPWM signal driver full-bridge inverting by 21 outputs of DSP control chip, inverse of the DC into AC, alternating current is transformed into industrial frequency AC output through duplex frequency boostering transformer 3 again.The above-mentioned three-phase inverter power supply architecture of controlling based on DSP is simple, easy to use and flexible, can select three-phase or single-phase application, with low cost, DSP control module 2 adopts voltage, double current loop modulation, quick by current inner loop, performance of noiseproof improves output waveform timely, utilize the transformation of current inner loop to controlled device simultaneously, can greatly simplify the design of outer voltage, output voltage adopts repetitive control to carry out the impact of the periodic vibrations such as deadband eliminating effect and nonlinear load, improve the waveform quality of output voltage, there is perfect overvoltage/undervoltage, overload, short circuit, overheat protector and warning function, whole power-efficient is high, good stability, extensibility is strong.
As shown in Figure 3, in the present embodiment, described DSP control chip adopts the dsp chip that model is DSPIC33.
As shown in Figure 4; described direct voltage testing circuit 22 comprises the sampling resistor R60 ~ R64 of several mutual series connection; and the operational amplifier U7A being connected with employing resistance; direct voltage testing circuit 22 is mainly for detection of DC input voitage, in DC input voitage overvoltage or starting protection action when under-voltage.
As shown in Figure 5, above-mentioned IGBT alternating current testing circuit 23 comprises successively connected Hall current sensor CS1, sampling resistor R69 and operational amplifier A 3A, A3B etc., IGBT alternating current testing circuit 23, mainly for detection of the alternating current after single-phase inverter module 1IGBT full bridge inverter, carries out current loop control according to the current value detecting.
As shown in Figure 6, above-mentioned ac voltage detection circuit 24 comprises AC voltage transformer TV1, and the operational amplifier A 1A being connected with AC voltage transformer TV1, ac voltage detection circuit 24, mainly for detection of the voltage after duplex frequency boostering transformer 3 boosts, carries out Voltage loop control according to the magnitude of voltage detecting.
As shown in Figure 7, above-mentioned isolation drive and protective circuit 25 comprise 4 parallel circuits that drive respectively the IGBT of each IGBT full bridge inverter of protection, each parallel circuit includes TLP250 optocoupler, and the triode being connected with optocoupler and diode, with one of them parallel circuit, be specifically described, the SPWM signal of DSP control chip 21 outputs is through optocoupler U2 isolation drive, again through two triode Q1, totem and two diode D9 that Q5 forms, the clamping protective circuit that D11 forms, now the SPWM signal of output is through isolating and having strengthened driving force, finally be input to the grid level of IGBT.
As shown in Figure 8, described sound light alarming circuit 26 comprises buzzer B1 and LED 3, LED4, by both combinations, realizes sound and light of alarm.
As shown in Figure 9, RS485 telecommunication circuit 27 comprises that model is the RS485 communication chip U1 of MAX3485, and the LED 1 being connected with RS485 communication chip U1, the UART Universal Asynchronous Receiver Transmitter of DSP control chip 21 (UART) is connected with the sending and receiving port of RS485 communication chip U1, according to certain baud rate and communication protocol, DSP control module 21 just can communicate with host computer.
The operation principle of the above-mentioned three-phase inverter power supply of controlling based on DSP: each the single-phase inverter module 1 described in the present embodiment is all independently-powered, independent control, can operate separately in a single-phase inverter power supply, also can three modules be operated in together in three-phase inverter power supply.DSP control module 21 is by 1 power supply of single-phase inverter module, and each single-phase inverter module 1 can be to the power supply of DSP control module, and the DSP while ensureing as single-phase inverter power supply of usining can normally work.DSP control chip 21 output 12 road SPWM drive signal, through light-coupled isolation, drive the full-bridge inverting part of each single-phase inverter module 1, three single-phase inverter module 1 alternating currents after IGBT full-bridge inverting are coupled and boost through a three-phase main-frequency transformer 3 again, obtain final three-phase main-frequency output voltage.The SPWM waveform of DSP control chip 21 outputs adopts bipolarity, and ambipolar SPWM ripple makes output harmonic wave number of times high, is convenient to like this design of LC filtering parameter, has reduced the capacity of L simultaneously.DSP control chip 21 is by direct voltage testing circuit, IGBT alternating current testing circuit, ac voltage detection circuit simultaneously, A/D port by collection of simulant signal such as the voltage of needs monitoring, electric current, temperature to DSP control chip 21, through DSP control chip 21 inter-process, convert, if monitored value is abnormal, adjust SPWM output signal, trigger buzzer warning and/or diode displaying simultaneously.
Above-described embodiment and graphic and non-limiting product form of the present invention and style, suitable variation or modification that any person of an ordinary skill in the technical field does it, all should be considered as not departing from patent category of the present invention.
Claims (8)
1. a three-phase inverter power supply of controlling based on DSP, it is characterized in that: comprise 3 separate single-phase inverter modules, and the DSP control module and the duplex frequency boostering transformer that are connected with 3 single-phase inverter modules respectively, wherein, described DSP control module comprises DSP control chip, the direct voltage testing circuit being connected with DSP control chip input, IGBT alternating current testing circuit, ac voltage detection circuit, the isolation drive and the protective circuit that are connected with DSP control chip output, sound light alarming circuit, described DSP control module further comprises a RS485 telecommunication circuit, for DSP control chip, communicate by letter with host computer, DC input voitage is input to the IGBT full bridge inverter of single-phase inverter module, the SPWM signal driver full-bridge inverting of being exported by DSP control chip, inverse of the DC into AC, alternating current is transformed into industrial frequency AC output through duplex frequency boostering transformer again.
2. a kind of three-phase inverter power supply of controlling based on DSP as claimed in claim 1, is characterized in that: described DSP control chip adopts the dsp chip that model is DSPIC33.
3. a kind of three-phase inverter power supply of controlling based on DSP as claimed in claim 1, is characterized in that: described direct voltage testing circuit comprises the sampling resistor of several mutual series connection, and the operational amplifier being connected with sampling resistor.
4. a kind of three-phase inverter power supply of controlling based on DSP as claimed in claim 1, is characterized in that: described IGBT alternating current testing circuit comprises connected successively Hall current sensor, sampling resistor and operational amplifier.
5. a kind of three-phase inverter power supply of controlling based on DSP as claimed in claim 1, is characterized in that: described ac voltage detection circuit comprises AC voltage transformer, and the operational amplifier being connected with AC voltage transformer.
6. a kind of three-phase inverter power supply of controlling based on DSP as claimed in claim 1, it is characterized in that: described isolation drive and protective circuit comprise 4 parallel circuits that drive respectively the IGBT of each IGBT full bridge inverter of protection, each parallel circuit includes optocoupler, and the triode being connected with optocoupler and diode, the SPWM signal of DSP control chip output drives through light-coupled isolation, the totem forming through two triodes again and two clamping protective circuit that diode forms, the SPWM signal of output is through isolating and increasing after driving force, be input to the grid level of IGBT.
7. a kind of three-phase inverter power supply of controlling based on DSP as claimed in claim 1, it is characterized in that: described RS485 telecommunication circuit comprises RS485 communication chip, and the light-emitting diode being connected with RS485 communication chip, the UART Universal Asynchronous Receiver Transmitter of DSP control chip is connected with the sending and receiving port of RS485 communication chip.
8. a kind of three-phase inverter power supply of controlling based on DSP as claimed in claim 1, is characterized in that: described sound light alarming circuit comprises buzzer and light-emitting diode.
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| CN201410403972.5A CN104201925A (en) | 2014-08-15 | 2014-08-15 | Three-phase inverter power supply based on digital signal processor (DSP) control |
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| CN107017784A (en) * | 2017-05-05 | 2017-08-04 | 艾普斯电源（苏州）有限公司 | A kind of electric source modes control method, control device and three phase frequency changing power |
| CN107591859A (en) * | 2017-09-22 | 2018-01-16 | 中惠创智无线供电技术有限公司 | A kind of wireless charging receives controller guard method and device |
| CN107769376A (en) * | 2016-08-18 | 2018-03-06 | 上海睿飓智能科技有限公司 | Voltage transformer system |
| CN117929929A (en) * | 2024-03-22 | 2024-04-26 | 江苏大烨智慧能源有限公司 | Three-phase high-voltage hybrid inverter with fault self-diagnosis function |
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