High efficiency power converter
First Claim
Patent Images
1. A power converter, comprising:
- a primary transformer winding circuit having at least one primary winding;
a secondary transformer winding circuit comprising;
at least one secondary winding coupled to the at least one primary winding;
a controlled rectifier transistor, each primary winding having a voltage waveform with transition times which are short relative to the on-state and off-state times of the controlled rectifier; and
a capacitive divider circuit, a signal controlling the controlled rectifier transistor being derived from the capacitive divider circuit.
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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.
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Citations
26 Claims
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1. A power converter, comprising:
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a primary transformer winding circuit having at least one primary winding;
a secondary transformer winding circuit comprising;
at least one secondary winding coupled to the at least one primary winding;
a controlled rectifier transistor, each primary winding having a voltage waveform with transition times which are short relative to the on-state and off-state times of the controlled rectifier; and
a capacitive divider circuit, a signal controlling the controlled rectifier transistor being derived from the capacitive divider circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for providing rectification in a power converter, comprising:
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controlling a voltage waveform across a primary transformer winding;
rectifying an AC waveform by a controlled rectifier transistor in a secondary transformer winding circuit, each primary winding having a voltage waveform with transition times which are short relative to the on-state and off-state times of the controlled rectifier; and
capacitively dividing the AC waveform to derive a control signal used to control the controlled rectifier transistor. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A power converter comprising:
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a primary transformer winding circuit having at least one primary winding;
a secondary transformer winding circuit comprising;
at least one secondary winding coupled to the at least one primary winding;
means for rectifying an AC waveform by a controlled rectifier transistor, each primary winding having a voltage waveform with transition times which are short relative to the on-state and off-state times of the controlled rectifier; and
means for capacitively dividing the AC waveform to derive a control signal used to control the controlled rectifier transistor.
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Specification