Power supply with DC breaker switch and reduced regulated DC link voltage

摘要

Generally, this disclosure provides circuits and methods to reduce and regulate DC link voltage in a power supply through the use of a DC breaker circuit. The breaker circuit may include a breaker switch configured to couple an input stage circuit of a power supply to an output stage circuit of the power supply and to provide a regulated DC link voltage to the output stage circuit, the level of the DC link voltage based on switching states of the breaker switch. The breaker circuit may further include a control circuit configured to generate a gate control signal to control the switching states of the breaker switch, the gate control signal based on a comparison of the DC link voltage to a high voltage threshold and a low voltage threshold, such that the magnitude of the DC link voltage is regulated to a set point and a peak-to-peak ripple.

主权项

1. A direct current (DC) breaker circuit comprising:
a breaker switch configured to couple an input stage circuit of a power supply to an output stage circuit of said power supply and to provide a regulated DC link voltage to said output stage circuit, the level of said DC link voltage based on switching states of said breaker switch; a control circuit configured to generate a gate control signal to control said switching states of said breaker switch, said gate control signal based on a comparison of said DC link voltage to a high voltage threshold and a low voltage threshold, such that the magnitude of said DC link voltage is regulated to a set point and a peak-to-peak ripple; and said control circuit further configured to generate said gate control signal such that said breaker switch state changes are synchronized with a frequency of a voltage provided by said input stage circuit to provide a zero voltage switching (ZVS) condition of said breaker switch.