Phase controlled bridge
OwnerAllan A. Nostwickinventor
Life of this patent
Estimating the term…
Abstract
A phase controlled 50 percent duty cycle variable output bridge power converter in which the 50% duty cycle is maintained constant while power output is controlled by changing the phase relationships between two 50 percent duty cycle square waves. When the 50 percent duty cycle square waves are 180 degrees out of phase, the output power is maximum, whereas when the waves are in phase, the output power is essentially zero. The circuits are conditioned to operate in a current mode, snubbing circuits are provided to improve load line characteristics and power consumption of the switching elements, and both soft start-up and controlled shut-down circuits are included to further enhance circuit performance.
Claims45
A phase controlled constant duty cycle bridge comprising:
- (a) pairs of switching elements severally conducting during alternate half waves to produce two essentially fifty percent duty cycle substantially square wave signals, said switching elements normally having first load-line voltage-current load characteristics;
- (b) means including phase shifting circuits interconnected with said switching elements for controlling phase relationships between said two substantially square wave signals;
- and
- (c) circuit conditioning means including snubbing circuits interconnected with said switching elements for modifying said first load-line characteristics at moments of switch-on of said switching elements to reduce voltage and current through said switching elements.
A phase controlled constant duty cycle bridge comprising:
- (a) pairs of switching elements severally conducting during alternate half waves to produce two essentially fifty percent duty cycle substantially square wave signals, said switching elements normally having first load-line voltage-current load characteristics;
- (b) means including phase shifting circuits interconnected with said switching elements for controlling phase relationships between said two substantially square wave signals;
- and
- (c) circuit conditioning means including snubbing circuits interconnected with said switching elements for modifying said first load-line characteristics at moments of switch-off of said switching elements to reduce voltage and current through said switching elements.
Dependencies are inferred from the claim text.