Very High Frequency Fm-Regulated Power Supply With Enhanced Output Power Capability
Original Publication Date: 1985-Feb-01
Included in the Prior Art Database: 2005-Feb-18
Disclosed is a frequency modulated switching power supply operating with an output power of 250 W and a switching frequency in the vicinity of 500 KHz. The supply offers enhanced output power capability by placing capacitors across the switching devices of the supply, thereby greatly reducing the device power dissipation during the turn-off transient of the switching cycle. Referring to the figure, a high DC voltage, which can be derived from a sinusoidal utility source using rectifiers (not shown), is applied across series bulk capacitors C1 and C2. This DC voltage is typically in the range of 200 to 400 VDC. Switching devices Q1 and Q2 operate alternately with a 50% duty cycle to form a balanced square-wave voltage between terminal A and terminal B.