Flyback power converter circuit with active clamping and conversion control circuit and control method thereof

    公开(公告)号:US10177670B1

    公开(公告)日:2019-01-08

    申请号:US15965915

    申请日:2018-04-28

    Abstract: A flyback power converter circuit includes: a transformer including a primary winding coupled to an input power and a secondary winding coupled to an output node, a primary side switch controlling the primary side winding to convert the input power to an output power on the output node through the secondary side winding, a clamping circuit including an auxiliary switch and an auxiliary capacitor connected in series to form an auxiliary branch which is connected with the primary side winding in parallel, and a conversion control circuit for adjusting an auxiliary ON time of the auxiliary switch during an OFF time of the primary side switch according to an estimated parasitic diode conduction time of a parasitic diode of the auxiliary switch; the auxiliary ON time is controlled to be substantially equal to and coincides with the estimated parasitic diode conduction time.

    Charger circuit and capacitive power conversion circuit and reverse blocking switch circuit thereof

    公开(公告)号:US10177576B2

    公开(公告)日:2019-01-08

    申请号:US15633694

    申请日:2017-06-26

    Abstract: A charger circuit for providing a charging current and voltage to a battery includes a power delivery unit, a capacitive power conversion circuit and a reverse blocking switch circuit. The power delivery unit converts an input power to a DC voltage and current. The capacitive power conversion circuit includes a conversion switch circuit including plural conversion switches coupled with one or more conversion capacitors, and a conversion control circuit. The DC current is regulated to a predetermined DC current level, and the conversion control circuit controls the connections of the plural conversion capacitors such that the charging current is scaled-up of the predetermined DC current level substantially by a current scale-up factor. The reverse blocking switch circuit is coupled in series with the capacitive power conversion circuit. The body diode of the reverse blocking switch is reversely coupled to the body diode of the conversion switch.

    WIRELESS POWER TRANSMITTER CIRCUIT AND CONTROL CIRCUIT AND CONTROL METHOD THEREOF

    公开(公告)号:US20180375380A1

    公开(公告)日:2018-12-27

    申请号:US15984291

    申请日:2018-05-18

    CPC classification number: H02J50/12 H02M1/088 H02M7/5387 H02M2001/0048

    Abstract: A wireless power transmitter circuit includes a power converter circuit, a power inverter circuit, an LC circuit, a resonant transmitter circuit, and a control circuit. The LC circuit includes an inductor and a capacitor, wherein an reactance of the LC circuit is substantially zero. The LC circuit is for converting the AC output current to a coil current. The resonant transmitter circuit includes at least one transmitter coil and a variable capacitor circuit, wherein the coil current flows through the at least one transmitter coil to generate a resonant wireless power. The control circuit generates a capacitance adjustment signal for adjusting an impedance of the variable capacitor circuit, such that the resonant transmitter circuit substantially operates in an impedance matched condition.

    FOREIGN OBJECT DETECTION METHO AND POWER SYSTEM CAPABLE OF DETECTING FOREIGN OBJECT

    公开(公告)号:US20180373216A1

    公开(公告)日:2018-12-27

    申请号:US15996516

    申请日:2018-06-03

    Abstract: A power system capable of detecting a foreign object, includes a power supplier side, a power receiver side, and a cable. The power supplier side includes a power converter, a foreign object detection and control circuit, and a pull-up circuit. The power converter supplies a supply voltage to the power receiver side according to a power supply control signal. The foreign object detection and control circuit generates the power supply control signal for controlling the power converter, and generates a foreign object detection and control signal according to a voltage at a supplier transmission node of the power supplier side, for determining whether a foreign object exists in the power receiver side. The pull-up circuit adjusts a level of a supply current which is supplied from the supplier transmission node to the power receiver side.

    HIGH VOLTAGE DEPLETION MODE MOS DEVICE WITH ADJUSTABLE THRESHOLD VOLTAGE AND MANUFACTURING METHOD THEREOF

    公开(公告)号:US20180315851A1

    公开(公告)日:2018-11-01

    申请号:US15909277

    申请日:2018-03-01

    Abstract: A high voltage depletion mode MOS device with adjustable threshold voltage includes: a first conductive type well region; a second conductive type channel region, wherein when the channel region is not depleted, the MOS device is conductive, and when the channel region is depleted, the MOS device is non-conductive; a second conductive type connection region which contacts the channel region; a first conductive type gate, for controlling the conductive condition of the MOS device; a second conductive type lightly doped diffusion region formed under a spacer layer of the gate and contacting the channel region; a second type source region; and a second type drain region contacting the connection region but not contacting the gate; wherein the gate has a first conductive type doping or both a first and a second conductive type doping, and wherein a net doping concentration of the gate is determined by a threshold voltage target.

    FLYBACK POWER CONVERTER CIRCUIT AND SECONDARY SIDE CONTROLLER CIRCUIT THEREOF

    公开(公告)号:US20180212528A1

    公开(公告)日:2018-07-26

    申请号:US15865212

    申请日:2018-01-08

    CPC classification number: H02M3/33592 H02M1/08 H02M1/32 H02M1/36 Y02B70/1475

    Abstract: A flyback power converter circuit converting an input voltage to an output voltage includes a transformer, a power switch, a synchronous rectifier (SR) switch, and a secondary side control circuit. The secondary side control circuit controls the SR switch to be ON when the power switch is OFF. The secondary side control circuit includes a driving switch for controlling the SR switch, a synchronous control circuit powered by a voltage related to the output voltage, which controls the driving switch to operate the SR switch, and a clamping circuit including a clamping switch and a clamping switch control circuit. The clamping switch control circuit controls the clamping switch according to a current inflow terminal voltage of the clamping switch and/or the voltage related to the output voltage, such that, during a secondary side power-on period, an equivalent impedance of the current inflow terminal of the clamping switch is smaller than a predetermined clamping impedance.

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