Abstract: A current mode controller for a series resonant power converter having a primary current, a conduction time and a pulse width modulator controller is disclosed. The current mode controller having a current ramp generator in electrical communication with the primary current and being operative to generate a current ramp having a voltage proportional to the primary current. A voltage ramp generator is in electrical communication with the power converter and operative to generate a voltage ramp. The current mode controller further includes a multiplier in electrical communication with the current ramp generator and the voltage ramp generator. The multiplier being operative to generate a time-dependent current ramp having an amplitude proportional to the conduction period of the power converter. A limited voltage ramp generator operative to generate a limited voltage ramp is in electrical communication with the voltage ramp generator.

Abstract: A high efficiency power converter for generating a high voltage from a low voltage supply. The power converter includes a resonant circuit in electrical communication with the low voltage supply via a switch. The power converter further includes a control circuit in electrical communication with the switch and a resonant inductor of the resonant circuit. The control circuit is operative to open and close the switch in response to the current flowing through the resonant inductor. A transformer is connected parallel to the resonant inductor and is operative to generate the high output voltage from the voltage of the resonant inductor. In the preferred embodiment, the switch is closed at the point in time when the current in the resonant inductor passes zero. At this time, switching conditions within the switch are ideal such that any losses experienced by the switch are conduction losses thereby resulting in improved efficiency of the power converter.

Abstract: A transformer that prevents breakage of the wire leads thereof. The transformer comprising a generally cylindrical bobbin having a plurality of windings wrapped therearound. Each of the windings has a respective first and second end. Attached to an end of the bobbin is a bobbin endplate having a plurality of first and second end lead breakouts disposed thereon. Accordingly, respective ones of the first ends are attached to respective first end lead breakouts and respective ones of the second ends are attached to respective second end lead breakouts in order to prevent breakage of the windings.

Abstract: An apparatus and method are disclosed for regulating a high voltage DC supply derived from a plurality of unstable high voltage signals. The invention functions to derive a high voltage DC signal from a received unstable high voltage signals. A derived signal is modulated and communicated to a series resonant regulation circuit by varying the operating frequency of the modulation device, while maintaining a fixed pulsed width full duty cycle operation, the output signal is translated in relation to the resonant frequency of the series resonant circuit, causing corresponding variations in the output voltage level.

Abstract: A dual-multivibrator circuit using a pair of mutually triggering multivibrator sections is connected to operate in a free-running mode when no external synchronization signal is applied to the circuit input, and in synchronism with a master pulse train of substantially the same pulse repetition rate when such a master pulse train is applied to the circuit input.