Patent ID: 7009851
Filing Date: 2006-03-07
Classification: H02M

Abstract:
1. A power unit with a self-oscillating series resonance converter for feeding of a load, wherein the series resonance converter comprises: two transistors coupled together, which are arranged to individually be affected by a control transformer, a series connection of an inductor and a capacitor, wherein each transistor together with the series coupled discharging capacitor or additional transistor belonging thereto is connected in parallel with said inductor, capacitor and control transformer, and wherein the load is connected over the capacitor, and means to change the oscillating frequency of the transistors and thereby the output voltage of the power unit, said means to change the oscillating frequency of the transistors comprises a control oscillator that in an alternating manner sends pulses that turns off the transistor that conducts current and thereby the oscillating frequency of the transistors is controlled by the pulse frequency of the control oscillator.