Power converter designed to enhance stability in operation

摘要

A power converter equipped with a plurality of semiconductor modules, a cooling device, a control circuit board, a smoothing capacitor, and a discharging resistor. The discharging resistor mounted on the control circuit board in parallel connection to the smoothing capacitor. The control circuit board has fabricated thereon a timing controller working to control timings of on/off operations of the semiconductor modules, a driver coupled to control terminals of the semiconductor modules to control voltage applied to the control terminals, and a power supply circuit working to transform a voltage input to the control circuit board into operating voltages for the timing controller and the driver. The driver is disposed between at least one of the timing controller and the power supply circuit and the discharging resistor, thereby protecting the timing controller and/or the power supply circuit mounted on the control circuit board from thermal energy radiating from the discharging resistor.