| 摘要 |
A pulse-inverter, especially a transistor inverter, is required to generate a system of polyphase output voltages as symmetrical as possible, having, for instance, trapezoidal waveforms. For this purpose, several reference voltages having different waveforms are generated wherein each section of an output voltage coincides with a section of a reference voltage. These reference voltages are pulse-width-modulated with a high-frequency sampling frequency and an inverted sampling frequency to form pulse width modulated reference voltages and pulse width modulated inverted reference voltages, respectively. The pulse-width-modulated reference voltages and pulse width modulated inverted reference voltages are coupled to the control lines of the inverter switches so as to generate, section by section, the output voltages having the reference waveform. All reference voltages and components used for generating the driving signal for one inverter output are also used for generating the driving signals of the other outputs so that a symmetrical system of driving voltages is produced without costly adjustments.
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