A power unit for producing both alternating current and direct current includes a switcher connected to a direct current source, wherein the switcher includes circuitry configured to produce both alternating current having first characteristics and direct current having second characteristics, wherein the circuitry comprises a plurality of insulated gate bipolar transistor circuits and drive circuits connected to the insulated gate bipolar transistor circuits. The switcher may receive variable voltage and frequency or constant voltage and frequency. In either case, the switcher circuitry is able to provide power of the desired characteristics. The power unit may be used to power aircraft when the aircraft is on the ground.

A power unit for producing both alternating current and direct current includes a switcher connected to a direct current source, wherein the switcher includes circuitry configured to produce both alternating current having first characteristics and direct current having second characteristics, wherein the circuitry comprises a plurality of insulated gate bipolar transistor circuits and drive circuits connected to the insulated gate bipolar transistor circuits. The switcher may receive variable voltage and frequency or constant voltage and frequency. In either case, the switcher circuitry is able to provide power of the desired characteristics. The power unit may be used to power aircraft when the aircraft is on the ground.

A primary-side controlled high power factor, low total harmonic distortion, quasi resonant converter converts an AC mains power line input to a DC output for powering a load, such as a string of LEDs. The AC mains power line input is supplied to a transformer that is controlled by a power switch. A device for controlling a power transistor of a power stage includes a shaper circuit including a first current generator configured to output a first current responsive to a bias voltage signal and to generate a reference voltage signal based on the first current. A bias circuit includes a second current generator configured to output a second current responsive to a compensation voltage signal and to generate the bias voltage based on the second current. An error detection circuit includes a third current generator configured to output a third current responsive to the reference voltage signal and to generate the compensation voltage signal based on the third current. A driver circuit has a first input configured to receive the reference voltage signal and having an output configured to drive the power transistor.

A switching power converter is provided with an overvoltage protection circuit that monitors the differential data signal voltages in a data interface such as a USB data interface powering a load device to detect soft short conditions.

A switching circuit includes a power switch, an active clamping circuit, and an active clamping control unit. When the power switch is modulated between an ON state and an OFF with a predetermined frequency, the active clamping control unit is configured to activate the function of the active clamping circuit for absorbing the energy of voltage surges. When the power switch is operating in the ON state or the OFF state, the active clamping control unit is configured to deactivate the function of the active clamping circuit for preventing the counter EMF from damaging the power switch.

Methods, apparatuses, computer program products, and computer readable media are disclosed herein. In one aspect, an apparatus includes a first capacitor, a first inductor in resonance with the first capacitor, a first electronic switch and a second electronic switch. The first electronic switch may be configured to cause, when the first electronic switch is closed, the first capacitor to store a first energy, and to cause a second energy to be stored in magnetic fields of the inductor. The second energy may be transferred to a load during a resonant portion of an energy transfer cycle. The apparatus may further include a second electronic switch configured to cause the stored first energy in the first capacitor to be transferred at least in part to the magnetic fields of the inductor, and then transferred to the load during a buck portion of the energy transfer cycle.

Methods, apparatuses, computer program products, and computer readable media are disclosed herein. In one aspect, an apparatus includes a first capacitor, a first inductor in resonance with the first capacitor, a first electronic switch and a second electronic switch. The first electronic switch may be configured to cause, when the first electronic switch is closed, the first capacitor to store a first energy, and to cause a second energy to be stored in magnetic fields of the inductor. The second energy may be transferred to a load during a resonant portion of an energy transfer cycle. The apparatus may further include a second electronic switch configured to cause the stored first energy in the first capacitor to be transferred at least in part to the magnetic fields of the inductor, and then transferred to the load during a buck portion of the energy transfer cycle.

A switched power converter (102) is arranged for supplying lighting means (108) as a load, having at least one (M40, M41) switch controlled by a control unit (106), wherein the control unit (106) comprises: a feedback controller, such as an ASIC or microcontroller, generating a switch control signal based on a feedback signal (Imeas), such as e.g. the load current (ILED), and
a separate sweep block, supplied with a signal representing a characteristic of the load (LED), such as e.g. the load voltage (VLED), and modulating the switch control signal (tout-ctrl) by a cyclic sweep, wherein the modulated switch control signal (tout-sweep) is provided directly or indirectly to the at least one switch (M40, M41).

Various embodiments are directed to a switch circuit comprising: two terminal nodes, comprising an upper node and a lower node; a plurality of switch modules, connected in series between the upper node and the lower node, wherein each of the switch modules comprises a switch, a rectifier, and a capacitor; a connecting circuit, coupled to the switch modules; and a power converter, coupled to the connecting circuit and to a power sink. The switch circuit is configured to limit a voltage or a component of a voltage in the switch circuit, and to recover power from the limiting of the voltage, wherein recovering the power comprises diverting power from the switch modules via the connecting circuit to the power converter, and the power converter outputting the power to the power sink.

The present disclosure relates to an adapter. The adapter includes an input port, a first output port and a second output port, and the adapter further includes: a rectifier circuit having an input terminal being connected to the input port of the adapter; a bus capacitor connected to an output terminal of the rectifier circuit in parallel; a first flyback converter having an input terminal connected to the bus capacitor and an output terminal coupled to the first output port; and a second flyback converter having an input terminal connected to the bus capacitor and an output terminal coupled to the second output port.