Driver having dead-time compensation function

摘要

Proposed is a driver having dead-time compensation function. The driver having dead-time compensation function generates an output voltage according to a voltage command and a frequency command. The driver includes an inverter, an output current detector and a control unit. The inverter receives a DC voltage and operates with a pulse width modulation mode so that the driver outputs the output voltage and an output current. The output current detector detects the current value of the output current to generate a output current detecting signal. The control unit outputs a switching control signal to inverter according to the voltage command and the frequency command. The control unit corrects a reference command according to dead-time and the output current detecting signal related to the output current so that amplitude and waveform smoothness of the output voltage and the output current are compensated.

主权项

1. A driver having a dead-time compensation function for outputting an output voltage according to a voltage command and a frequency command to drive a load, comprising:
an inverter operating with a pulse-width modulation mode for receiving a DC voltage to output the output voltage and an output current to the load; an output current detector connected to a current loop of the output current for detecting the output current and outputting an output current detecting signal accordingly; and a control unit connected to the inverter and the output current detector for outputting a switching control signal with a dead time to the inverter according to the voltage command and the frequency command, thereby driving the inverter to operate with the pulse-width modulation mode; wherein the control unit is configured to correct a reference command which is varied along with the voltage command and the frequency command according to the output current detecting signal and the dead time, thereby compensating an amplitude of the output current, and a smoothness of a waveform of the output current; wherein the control unit includes a plurality of control blocks, comprising: a reference command generation block for generating the reference command according to a voltage value indicated by the voltage command and a frequency value indicated by the frequency command; a smoothness correction block for analyzing the smoothness of the waveform of the output current based on the frequency value indicated by the frequency command and generating a waveform correction signal accordingly; an amplitude correction block for generating an amplitude correction signal having an amplitude being varied along with the duration of the dead time and having a frequency being identical to the frequency value indicated by the frequency command; a summation block for adding the waveform correction signal and the amplitude correction signal into the reference command to generate a secondary reference command; and a pulse-width modulation block for generating the switching control signal according to the secondary reference command to compensate the output voltage, the amplitude of the output current, and the smoothness of the waveform of the output current.