Primary only constant voltage/constant current (CVCC) control in quasi resonant convertor
First Claim
1. A power-supply apparatus comprising:
- a converter circuit comprising a primary switching element and an auxiliary switching element, the auxiliary switching element for transferring a reflected voltage signal;
a transformer comprising a primary and a secondary, the primary coupled with the converter circuit, the primary comprising a single winding and the secondary comprising a single winding;
an output rectifier circuit coupled with the secondary of the transformer;
a resonant circuit included in the converter circuit, the resonant circuit being coupled with the primary, the resonant circuit comprising one or more resonance capacitors, the one or more resonance capacitors configured for providing a transformer resonance, the transformer resonance comprising the reflected voltage signal, the capacitance of the one or more resonance capacitors and a parasitic capacitance of the transformer, the reflected voltage signal received at the resonant circuit via the auxiliary switching element, the reflected voltage signal being reflected from the secondary to the primary; and
a current feedback circuit coupled with the primary, the current feedback circuit comprising an electrical lead coupled between a terminal of the primary and an input of a controller of the converter circuit.
3 Assignments
0 Petitions
Accused Products
Abstract
A power supply apparatus and method of regulating is provided. A converter circuit includes a primary switching element and an auxiliary switching element. The auxiliary switching element is for transferring a reflected voltage signal. A transformer includes a primary and a secondary, the primary is coupled with the converter circuit. The primary and the secondary each comprise a single winding. An output rectifier circuit is coupled with the secondary of the transformer. A resonant circuit is included in the converter circuit and is coupled with the primary. The resonant circuit includes one or more resonance capacitors that are configured for providing a transformer resonance. The transformer resonance comprises the reflected voltage signal, the capacitance of the one or more resonance capacitors and a parasitic capacitance of the transformer. The reflected voltage signal is reflected from the secondary to the primary. A current feedback circuit is coupled between the primary and a controller. A virtual output current feedback loop is provided for regulating an output current using the reflected voltage signal.
62 Citations
39 Claims
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1. A power-supply apparatus comprising:
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a converter circuit comprising a primary switching element and an auxiliary switching element, the auxiliary switching element for transferring a reflected voltage signal; a transformer comprising a primary and a secondary, the primary coupled with the converter circuit, the primary comprising a single winding and the secondary comprising a single winding; an output rectifier circuit coupled with the secondary of the transformer; a resonant circuit included in the converter circuit, the resonant circuit being coupled with the primary, the resonant circuit comprising one or more resonance capacitors, the one or more resonance capacitors configured for providing a transformer resonance, the transformer resonance comprising the reflected voltage signal, the capacitance of the one or more resonance capacitors and a parasitic capacitance of the transformer, the reflected voltage signal received at the resonant circuit via the auxiliary switching element, the reflected voltage signal being reflected from the secondary to the primary; and a current feedback circuit coupled with the primary, the current feedback circuit comprising an electrical lead coupled between a terminal of the primary and an input of a controller of the converter circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of regulating a power supply apparatus comprising:
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generating a reflected voltage signal in a transformer comprising a primary and a secondary, the reflected voltage signal being reflected from the secondary to the primary, the primary being coupled with a converter circuit, the primary comprising a single winding and the secondary comprising a single winding; transferring the reflected voltage signal from the primary to the converter circuit, the converter circuit comprising a primary switching element and an auxiliary switching element, the auxiliary switching element for transferring the reflected voltage signal; generating a transformer resonance with a resonant circuit included in the converter circuit, the resonant circuit being coupled with the primary, the resonant circuit comprising one or more resonance capacitors, the one or more resonance capacitors configured for providing the transformer resonance, the one or more resonance capacitors and an inductance of the transformer forming a resonant tank; and modifying a duty cycle of the primary-switch based on an output current using a current feedback circuit coupled with the primary, the current feedback circuit comprising an electrical lead coupled between a terminal of the primary and an input of a controller of the converter circuit. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A power supply apparatus comprising:
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an input capacitor coupled across an input node; a converter circuit comprising a primary switching element and an auxiliary switching element, the auxiliary switching element for transferring a reflected voltage signal; a transformer comprising a primary and a secondary, the primary coupled with the converter circuit, the primary comprising a single winding and the secondary comprising a single winding; an output rectifier circuit coupled with the secondary of the transformer; a resonant circuit included in the converter circuit, the resonant circuit being coupled with the primary, the resonant circuit comprising one or more resonance capacitors, the one or more resonance capacitors configured for providing a transformer resonance, the transformer resonance comprising the reflected voltage signal, the capacitance of the one or more resonance capacitors and a parasitic capacitance of the transformer, the reflected voltage signal received at the resonant circuit via the auxiliary switching element, the reflected voltage signal being reflected from the secondary to the primary; and a current feedback circuit coupled with the primary, the current feedback circuit comprising an electrical lead coupled between a terminal of the primary and an input of a controller of the converter circuit. - View Dependent Claims (38, 39)
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Specification