Abstract: A resonant switching converter including a first series resonant circuit including a first inductor and a first capacitor connected in series with a voltage source, a second series resonant circuit including a second inductor and the first capacitor, a switch connected in series with said second inductor and responsive to the current in the first inductor for enabling a discharge path through the load for the charge stored by the first capacitor. A first control circuit responsive to the voltage on the first capacitor may also be provided for operating the switch at a controlled voltage to facilitate line and load regulation. A second control circuit responsive to the output voltage may be included to provide line and load regulation. The switch is only closed after the resonant capacitor has charged to its peak value or beyond.

Abstract: A precision regulated power supply for charging an energy storage capacitor wherein regulation is achieved using a triac to interrupt a connection between a primary winding of a transformer and a DC power source. The circuit is useful in a power supply for a photocopier flash lamp where precision regulation of light intensity is required. A control winding is wound on the transformer closely coupled to the power secondary winding. A triac is connected across the control winding such that the winding can be short circuited when it is desired to cease charging of the storage capacitor. Short-circuiting of the control winding collapses the voltage on the transformer secondary winding thereby inhibiting the flow of current in the secondary winding. Regulating circuitry senses the voltage on the capacitor and gates the control winding triac into conduction when that voltage reaches a desired magnitude.

Abstract: A trapezoidal reference voltage waveform is provided to a PWM inverter for synthesizing an inverter output voltage waveform having substantially the same shape as the reference for effecting limiting of peak capacitive current at the output of a high-leakage reactance transformer fed by the inverter.