| 摘要 |
This invention relates to a multiple stage switch circuit for power electronics. The switch circuit is intended to supply electric power to any type of load. The invention provides a power supply circuit for providing power to a load, comprising: power supply stages each comprising a pair of switchable members in a bridge circuit and an LC filter connected between the center of the bridge circuit and the load, and a control stage for controlling turning on and off of the switchable members. According to the invention at least two power supply stages are connected in parallel with a common output to the load, and said power supply stages are synchronized by a common master control unit. The power supply circuit further comprises a unit for enabling a number of power supply stages while the rest of the power supply stages may be disabled in response to required output power characteristics. Preferably, the number of enabled power supply stages is dependent of the output power (voltage and current), so that the switch frequency range of the power supply circuit is kept within limits. |
