HIGH EFFICIENCY POWER CONVERTER

• US 20100091526A1
• Filed: 06/05/2009
• Published: 04/15/2010
• Est. Priority Date: 01/24/1997
• Status: Active Grant

• Current Assignee: SynQor Incorporated
• Original Assignee: SynQor Incorporated
• Inventors: Schlecht, Martin F.
• Granted Patent: US 8,023,290 B2
• Time in Patent Office: Days
• US Class Current: 363/25
• CPC Class Codes: H02M 1/007 Plural converter units in cascade push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826
• CPC Class Codes: H02M 3/335 using semiconductor devices only
• CPC Class Codes: H02M 3/33546 with automatic control of the output voltage or current H02M3/33561 takes precedence
• CPC Class Codes: H02M 3/33553 with galvanic isolation between input and output of both the power stage and the feedback loop
• CPC Class Codes: H02M 3/33592 having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
• CPC Class Codes: H02M 3/3372 of the parallel type
• CPC Class Codes: H02M 3/3374 with preregulator, e.g. current injected push-pull
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in series with first and second primary windings, respectively, are turned on for a fixed duty cycle, each for approximately one half of the switching cycle. Switched transition times are short relative to the on-state and off-state times of the controlled rectifiers. The control inputs to the controlled rectifiers are cross-coupled from opposite secondary transformer windings.

Claims

1. 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.

2-28. -28. (canceled)