The present invention relates to a constant voltage apparatus for an electric compressor inverter. A constant voltage apparatus for an electric compressor inverter according to the present invention comprises a switch unit for transferring a DC voltage supplied from a high voltage battery through a switching operation; a transformer for converting the switched voltage input to a first winding of a primary side to output the converted voltage to a first secondary side winding and a second secondary side winding; a first rectifying unit for rectifying and smoothing a voltage output from the first secondary side winding to supply a first voltage to a first load; a second rectifying unit for rectifying and smoothing a voltage output from the second secondary side winding to supply a second voltage lower than the first voltage to a second load; a voltage detecting unit for detecting voltage values of the first and second voltages; and a control unit for transferring a pulse width modulation (PWM) control signal to the switch unit to supply a constant voltage to the first and second loads, wherein the PWM control signal is calculated by comparing the detected first voltage with a preset reference voltage. According to the constant voltage apparatus for an electric compressor inverter of the present invention, low and high voltage powers are simultaneously generated based on the voltage provided from the high voltage battery regardless of a wide input voltage range. In addition, the present invention can reduce costs by using a high and low voltage module in common.
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