High-frequency DC-DC power converter with zero-voltage switching of single primary-side power device
First Claim
1. A power supply for providing a DC output potential of selected amplitude responsive to a DC input potential, comprising:
- single-ended means for switching a node between respective high and low current-conduction conditions, with respect to a circuit common potential, responsive to a periodic control signal;
said means having a parasitic reactance between said node and said common potential;
a multi-resonant circuit having at least one reactive element in series with said parasitic reactance during at least a portion of the control signal cycle;
a transformer having a primary winding, coupled in parallel across a portion of the multi-resonant circuit and receiving an AC potential formed by action of the single-ended means and said milti-resonant circuit, and a secondary winding across which is formed another AC potential related to said AC potential at said primary winding;
means for rectifying the another AC potential to provide said DC out-put potential; and
means for providing the periodic control signal to said single-ended means with a varying frequency to maintain a selected amplitude of the DC output potential, and comprising;
means for generating an error signal related to the difference between the actual amplitude of the DC output potential and a reference amplitude;
means for generating a ramp signal commencing responsive to a gating signal;
means for generating a switching signal to cause said single-ended means to switch conduction conditions and said ramp means to receive said gating signal, whenever the ramp and error signal amplitudes are substantially equal; and
means for generating the gating signal only if the switching signal is present when the node is in the high-conduction condition to common potential.
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Accused Products
Abstract
A high-frequency DC-DC Converter uses a single, primary-side power switching transistor and all of the circuit parasitic elements to achieve high efficiency and small size while operating from no-load to full-load with a relatively narrow operating frequency variation of only about 1.35:1 maximum, and with a reasonably low peak switching device voltage which is only about 3 times the input voltage. The energy stored in the switching device output capacitance is not lost during each high-frequency cycle, but is resonated back to the supply or load circuit. A single-ended-parallel, multi-resonant-converter (SEP-MRC) utilizes a control circuit for controlling the conduction, or "on", time of the single primary-side device, to adjust and regulate the load voltage.
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Citations
12 Claims
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1. A power supply for providing a DC output potential of selected amplitude responsive to a DC input potential, comprising:
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single-ended means for switching a node between respective high and low current-conduction conditions, with respect to a circuit common potential, responsive to a periodic control signal;
said means having a parasitic reactance between said node and said common potential;a multi-resonant circuit having at least one reactive element in series with said parasitic reactance during at least a portion of the control signal cycle; a transformer having a primary winding, coupled in parallel across a portion of the multi-resonant circuit and receiving an AC potential formed by action of the single-ended means and said milti-resonant circuit, and a secondary winding across which is formed another AC potential related to said AC potential at said primary winding; means for rectifying the another AC potential to provide said DC out-put potential; and means for providing the periodic control signal to said single-ended means with a varying frequency to maintain a selected amplitude of the DC output potential, and comprising;
means for generating an error signal related to the difference between the actual amplitude of the DC output potential and a reference amplitude;
means for generating a ramp signal commencing responsive to a gating signal;
means for generating a switching signal to cause said single-ended means to switch conduction conditions and said ramp means to receive said gating signal, whenever the ramp and error signal amplitudes are substantially equal; and
means for generating the gating signal only if the switching signal is present when the node is in the high-conduction condition to common potential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification