High efficiency power converter

  • US 7,564,702 B2
  • Filed: 09/14/2007
  • Issued: 07/21/2009
  • Est. Priority Date: 01/24/1997
  • Status: Expired due to Fees
First Claim
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1. A DC-DC power converter system providing plural regulated DC outputs, each having a regulated voltage, comprising:

  • a) a DC input providing an input voltage that varies over a range that is more than plus or minus a few percent;

    b) a non-regulating isolating step-down converter through which power from the DC input flows first before flowing through any regulation stage, the non-regulating isolating step-down converter providing a non-regulated, isolated DC output having a non-regulated voltage and comprising;

    i) at least one transformer that is not driven into saturation, the at least one transformer having plural windings including at least one primary winding and at least one secondary winding;

    ii) plural power MOSFET switches in circuit with the at least one primary winding, the plural power MOSFET switches causing power to flow into the at least one primary winding;

    iii) control circuitry coupled to the plural MOSFET switches, the control circuitry determining when the power MOSFET switches are turned on and off in a switching cycle at a switching frequency; and

    iv) plural controlled rectifiers in circuit with the at least one secondary winding, each having a parallel uncontrolled rectifier, each controlled rectifier being turned on for an on-state time and off for an off-state time in synchronization with a voltage waveform of the at least one primary winding to provide the non-regulated, isolated DC output, the voltage waveform of the at least one primary winding having a fixed duty cycle and transition times which are short relative to the on-state and the off-state times of the controlled rectifiers; and

    c) plural non-isolating down-converter switching regulators, each receiving power from the non-regulated, isolated DC output and each providing one of the regulated DC outputs having a regulated voltage.

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