Power conversion apparatus

摘要

A power conversion apparatus according to one aspect of the present disclosure comprises a bridge circuit including a first switch and a second switch, a first auxiliary switch, a first auxiliary inductor, a control device, a transformer, a secondary-side inductor, a rectifier circuit, a smoothing circuit, and an output detection circuit. The control device performs an on/off operation on the first auxiliary switch if a value detected by the output detection circuit is smaller than or equal to a setting value, and maintains the first auxiliary switch in an off state if the detected value exceeds the setting value.

主权项

1. A power conversion apparatus comprising:
a bridge circuit that converts an input direct-current voltage into a first alternating-current voltage, the bridge circuit including a first switch, a second switch connected in series with the first switch, a first capacitor connected in parallel with the first switch, and a second capacitor connected in parallel with the second switch; a first auxiliary switch including a first end connected to a first node between the first switch and the second switch; a first auxiliary inductor connected to a second end of the first auxiliary switch; a control device that controls on and off of the first switch, the second switch, and the first auxiliary switch; a transformer that converts the first alternating-current voltage into a second alternating-current voltage, the transformer including a primary winding connected to the bridge circuit and a secondary winding electromagnetically coupled with the primary winding; a secondary-side inductor including a first end connected to the secondary winding; a rectifier circuit that rectifies the second alternating-current voltage to generate a rectified voltage, the rectifier circuit connected to a second end of the secondary-side inductor; a smoothing circuit that smooths the rectified voltage to generate an output voltage and an output current, the smoothing circuit being connected to the rectifier circuit; and an output detection circuit that detects a value according to at least one of the output voltage and the output current, wherein, if the detected value is smaller than or equal to a predetermined setting value, the control device
puts the first auxiliary switch into an on state in a first period from when the first switch is turned off until the second switch is turned on, andputs the first auxiliary switch into an off state in a second period in which the first switch or the second switch is put into an on state; and if the detected value exceeds the setting value, the control device maintains the first auxiliary switch in the off state.