Power supply device with a controller that controls a first switching element and a second switching element

A power supply device comprising:

• an insulated transformer that transforms a voltage of alternating-current power;
• a rectifying circuit that rectifies the alternating-current power transformed by the transformer to direct-current power;
• a smoothing inductor that smoothes the direct-current power rectified by the rectifying circuit;
• a first output terminal that outputs the direct-current power smoothed by the smoothing inductor;
• a second output terminal that is a terminal different from the first output terminal and outputs the direct-current power smoothed by the smoothing inductor;
• a first switching element that is provided between the smoothing inductor and the first output terminal and adjusts a current output from the smoothing inductor to the first output terminal;
• a second switching element that is provided between the smoothing inductor and the second output terminal and adjusts a current output from the smoothing inductor to the second output terminal;
• and
• a controller that controls the first switching element and the second switching element, wherein
• the controller controls the first switching element by using a rectangular first pulse signal generated based on a second feedback-control amount corresponding to a difference between an output value output from any one of the first output terminal and the second output terminal and a target value to be targeted, and controls the second switching element by using a second pulse signal obtained by reversing the first pulse signal.

A power supply device comprising:

• an insulated transformer that transforms a voltage of alternating-current power;
• a rectifying circuit that rectifies the alternating-current power transformed by the transformer to direct-current power;
• a smoothing inductor that smoothes the direct-current power rectified by the rectifying circuit;
• a first output terminal that outputs the direct-current power smoothed by the smoothing inductor;
• a second output terminal that is a terminal different from the first output terminal and outputs the direct-current power smoothed by the smoothing inductor;
• a first switching element that is provided between the smoothing inductor and the first output terminal and adjusts a current output from the smoothing inductor to the first output terminal;
• a second switching element that is provided between the smoothing inductor and the second output terminal and adjusts a current output from the smoothing inductor to the second output terminal;
• a controller that controls the first switching element and the second switching element;
• a snubber circuit that includes a storage element storing surge power due to reverse recovery time of the rectifying circuit, a third switching element discharging the surge power stored in the storage element, and a snubber inductor provided between the third switching element and the second output terminal;
• and
• a fourth switching element that is provided between the first output terminal and the third switching element and energizes or de-energizes a current flowing between the first output terminal and the third switching element, wherein
• the snubber inductor, the third switching element, and the fourth switching element configures a step-down chopper circuit that steps down a voltage of power supplied from the first output terminal to output the stepped-down voltage to the second output terminal, and a step-up chopper circuit that steps up a voltage of power supplied from the second output terminal to output the stepped-up voltage to the first output terminal.