Patent ID: 8605467

Claim:
A converter circuit comprising: a transformer comprising a first side and a second side; a switch coupled to the first side of the transformer; a rectifying diode coupled to the second side of the transformer and to a first output terminal of the converter circuit; and a clamping diode coupled to the second side of the transformer, to the rectifying diode, and to a second output terminal of the converter circuit, wherein the converter circuit comprises a boost section and a flyback section and wherein the boost section comprises: the switch; and a boost diode coupled to the switch and to the first side of the transformer; and the flyback section comprises: the rectifying diode; the clamping diode; and first and second capacitors coupled to the rectifying diode, to the boost diode, and to the second side of the transformer; and wherein the second capacitor is coupled to the first capacitor, to the boost diode, and to the second side of the transformer; the converter circuit is configured to operate in seven different operation modes during a switching period; the switch is closed in a first of the operational modes; the rectifying diode is turned off and a first resonance occurs in a second of the operational modes; the clamping diode is turned on in a third of the operational modes; the switch is opened and the boost diode is turned on in a fourth of the operational modes; the clamping diode is turned off and a second resonance occurs in a fifth of the operational modes; the rectifying diode is turned on in a sixth of the operational modes; and the boost diode is turned off in a seventh of the operational modes.