Patent ID: 7269034

Claim:
A dc-dc converter system comprising: isolation/semi-regulation circuitry comprising: a primary transformer winding circuit having at least one primary winding; a secondary transformer winding circuit having at least one secondary winding coupled to at least one primary winding and having plural controlled rectifiers, each having a parallel uncontrolled rectifier; and a control circuit that senses a voltage in the primary transformer winding circuit to provide a feedback control signal without bridging an isolation barrier between the primary and secondary transformer winding circuits, the feedback control signal controlling semi-regulation by control of duty cycle of a transistor in the primary transformer winding circuit; and an output of the isolation/semi-regulation circuitry whose voltage value drops due to impedance of an output path; and a plurality of non-isolating switching regulators, each receiving the output of the isolation/semi-regulation circuitry whose voltage value drops.