Inverter driving device based on digital signal processor (DSP) and complex programmable logic device (CPLD)

Abstract

The invention relates to an inverter driving device based on a digital signal processor (DSP) and a complex programmable logic device (CPLD). The inverter driving device comprises the DSP and CPLD driving circuit of an embedded type microprocessor, a one-path A-phase voltage zero passage detecting circuit, a one-path controller area network (CAN) communication circuit, a three-path Hall voltage sensor circuit, a three-path Hall current sensor circuit, a three-path D / A switching circuit, a three-path compensating current adjusting circuit, a three-path current tracing circuit and a three-path vector voltage adjusting circuit, wherein the DSP circuit sends three digital command current signals converted into three simulated command current signals with the difference of 120 degree and the same compensating current frequency through the three-path D / A switching circuit; the three-path compensating current adjusting circuit adjusts three-phase compensating current detected by three-path Hall current sensor circuit into appropriate compensating current signals; the three-path current tracing circuit compares the three simulated command current signals and the current generated by the three-path compensating current adjusting circuit to obtain three current tracing and comparing signals; and the three-path vector voltage adjusting circuit adjusts the phase voltage detected by the three-path Hall voltage sensor circuit into signals of a region in which the vector voltage is positioned.

Description

technical field [0001] The present invention relates to a multi-level inverter driving device, in particular to an embedded microprocessor DSP as a control circuit, and a complex programmable logic device CPLD (Complex Programmable Logic Device) as a driving circuit, that is, based on CPLD technology, using current The spatial distribution of the deviation vector (current deviation change rate vector) is used to give the best voltage vector switching, so that the current deviation is controlled within the hysteresis width to realize the drive signal of the inverter circuit. The device can be used in reactive power compensation, active filtering, switching power supply, motor speed control, inverter, ultrasonic generator, charger and other fields. Background technique [0002] In recent years, the frequency conversion technology with the inverter circuit as the core has been continuously improved, and the application of frequency conversion technology has increased, which has...

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Problems solved by technology

However, most of them use a single DSP to complete the entire control algorithm, which makes the DSP program complicated and confusing. At the same time, because the three-level inverter needs 12 PWM signals, the two event managers of the DSP cannot be completely synchronized, resulting in the same phase. The power devices cannot be triggered completely synchronously, which seriously affects the performance of the inverter, and is limited by the number of PWM signals of the DSP, and cannot be extended to more levels of inverter control

[0005] Although the voltage space vector pulse width modulation (SVPWM) function of the microprocessor (DSP) can realize the output of the drive signal of the inverter circuit, the software complexity of the microprocessor is relatively large, and the rapidity of the system response is low, which usually affects to the output inverter circuit drive signal, and the control accuracy and real-time performance cannot be guaranteed

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