Abstract: Embodiments of the present disclosure provide a half-bridge flyback converter, a control method, and a control circuit. The control method includes: controlling a second primary switching transistor to be ON for a first duration in a first switching period in a case where the half-bridge flyback converter operates in a free resonant state, and in response to detecting, based on sampled voltage information of a secondary power circuit, that the second primary switching transistor is turned on, controlling a secondary switching transistor to be ON for a second duration, such that the half-bridge flyback converter is reverse-magnetized to generate a negative magnetizing current, and thus a voltage across the first primary switching transistor is reduced to zero. By controlling the first primary switching transistor to turn on, zero-voltage switching of the first primary switching transistor is achieved. With the method, noise of the half-bridge flyback converter is reduced.

Abstract: A half-bridge control circuit, an Asymmetric Half Bridge Converter (AHB), a device, and a method are provided. The half-bridge control circuit includes a primary controller unit, an isolated communication unit, and a secondary controller unit, wherein the primary controller unit is configured to drive a first switching tube and a second switching tube to conduct in different time periods, and the secondary controller unit is configured to drive a synchronous rectifier tube to conduct or turn off; in one switching cycle, the secondary controller unit is configured to determine a turn-off time of the second switching tube, and send a first turn-off signal to the primary controller unit through the isolated communication unit at the turn-off time; and the primary controller unit is configured to control the second switching tube to turn off in response to the first turn-off signal.

Abstract: A DC-DC converter includes an inductor, a rectifier module, a first bridge arm topology and a second bridge arm topology and a third bridge arm topology in parallel as well as a capacitor, wherein the first bridge arm topology includes a first switching tube and a fourth switching tube in series, the second bridge arm topology includes a second switching tube and a fifth switching tube in series, and the third bridge arm topology includes a third switching tube and a sixth switching tube in series; the inductor has one end connected to a coupling point formed by connecting the first switching tube and the fourth switching tube in series, and the other end connected to a coupling point formed by connecting the second switching tube and the fifth switching tube in series.

Abstract: The present invention discloses a DC-DC converter, comprising: an inductor, a rectifier module, a first bridge arm topology and a second bridge arm topology and a third bridge arm topology in parallel as well as a capacitor, wherein the first bridge arm topology includes a first switching tube and a fourth switching tube in series, the second bridge arm topology includes a second switching tube and a fifth switching tube in series, and the third bridge arm topology includes a third switching tube and a sixth switching tube in series; the inductor has one end connected to a coupling point formed by connecting the first switching tube and the fourth switching tube in series, and the other end connected to a coupling point formed by connecting the second switching tube and the fifth switching tube in series; the first bridge arm topology and the inductor constitute a Buck converter, the second bridge arm topology and the inductor constitute a Boost converter, and the second bridge arm topology, the third bridge