A flying capacitor converter includes an inductor, a first switch and a second switch, a first diode and a second diode, a first capacitor and a second capacitor, a flying capacitor, a third diode and a third capacitor, a fourth diode, and a fifth diode. The inductor is coupled to a first node. The first switch and the second switch are commonly connected to a second node. The first diode and the second diode are commonly connected to a third node. The first capacitor and the second capacitor are commonly connected to a fourth node. The flying capacitor is coupled to the second node and the third node. The third diode and the third capacitor are commonly connected to a fifth node. The fifth diode is coupled to the third node and the fourth node.

An electronic circuit includes a diode configured to carry a surge current generated by switching of a first transistor, a capacitor connected between a cathode of the diode and a control electrode of the first transistor, and a first variable impedance circuit configured to vary an impedance between the control electrode of the first transistor and a first reference voltage node according to the surge current flowing to the diode.

A voltage clamp circuit comprises an input portion arranged to receive an input voltage at an input terminal. The input portion comprises a clamp diode having an anode connected to the input terminal. A first terminal of a switching element is connected to a cathode of the clamp diode and a control terminal of the switching element is connected to a reference node (Vref). A resonant tank portion comprises an inductor and a capacitor connected in series at a resonance node (Vres). The resonance node is connected to a second terminal of the switching element. The capacitor is connected between the resonance node and the first terminal of the switching element. The inductor is connected between the resonance node and an output terminal of the voltage clamp. When a voltage at the first terminal of the switching element is greater than a threshold value the switching element is turned on.

A power conversion system includes a power conversion circuit and a start-up circuit. The power conversion circuit includes an output capacitor, a first switching unit, a second switching unit, a flying capacitor and a magnetic element. The second switching unit includes two switch groups. The flying capacitor is connected between a first terminal and a second terminal of the power conversion circuit. The magnetic element includes two first windings that are electromagnetically coupled with each other. A first one of the two first windings is electrically connected between one switch group and the second terminal of the power conversion circuit. A second one of the two first windings is electrically connected between the other switch group and the second terminal of the power conversion circuit. The start-up circuit includes a third winding and an inductor. The third winding is electromagnetically coupled with the first windings.

A snubber circuit connected to a switching circuit, wherein the switching circuit including a higher side switch element connected between a high potential node and a switch node, a lower side switch element connected between the switch node and a reference potential node, and a bypass capacitor connected between the high potential node and the reference potential node, the snubber circuit comprising: a snubber capacitor; a diode; and a coil, wherein a negative electrode of the snubber capacitor is connected to the reference potential node, an anode of the diode is connected to the switch node and a cathode of the diode is connected to a positive electrode of the snubber capacitor, and one end of the coil is connected to the positive electrode of the snubber capacitor and the other end of the coil is connected to the high potential node.

A charge pump includes a first-stage switch, intermediate-stage switches, and a final-stage switch sequentially connected in series to a power line from an input terminal side. A snubber circuit is connected to the intermediate-stage switch. The snubber circuit includes a capacitor and first and second diodes. The capacitor is connected in series to the first diode and the series circuit of the capacitor and the first diode is connected in parallel to the intermediate-stage switch. The cathode of the second diode is connected to a node between the capacitor and the first diode and the anode of the second diode is connected to output terminal.

A snubber circuit configured to be coupled to a switching circuit, comprises a snubber capacitor; a diode; and a coil, wherein the switching circuit includes an upper switch element coupled between a high potential node and a switch node, a lower switch element coupled between the switch node and a reference potential node, and a bypass capacitor coupled between the high potential node and the reference potential node, a positive electrode of the snubber capacitor is configured to be coupled to the high potential node, an anode of the diode is coupled to a negative electrode of the snubber capacitor, and a cathode of the diode is coupled to the switch node, and one end of the coil is coupled to the negative electrode of the snubber capacitor, and another end of the coil is coupled to the reference potential node.

An apparatus according to an emvodiment includes upper arm circuits, lower arm circuits and a flying capacitor. Each of the upper arm circuits is configured in such a manner that one or more first switch circuits each including a first switching element are connected in series. Each of the lower arm circuits is configured in such a manner that one or more second switch circuits each including a second switching element are connected in series. The apparatus includes a first circuit configured to cause a capacitor to be connected in parallel with the power storage via the first switching element; and a second circuit configured to cause a capacitor to be connected in parallel with the power storage via the second switching element.

This DC pulse power supply device comprises a voltage clamper including a capacitor that is connected in parallel to a DC reactor in a chopper circuit provided in a pulsing unit in order to suppress increases in the surge voltage resulting from the leakage inductance of the DC reactor. During the start-up of pulsing operation, which is the initial stage of the pulse mode, the frequency of the pulsing operation of the chopper circuit is controlled over the period until the capacitor voltage is charged to a sufficient voltage to reset the magnetic saturation of the DC reactor.

A power supply unit for an electrical control device having a transformer with a primary coil that can be actuated by means of a switchable primary switch and at least one secondary coil. The primary coil and the at least one secondary coil are arranged on a common magnetic core. The secondary coil provides at least two outputs with controllable output voltages, and the secondary coil is assigned a switchable secondary switch for each of the at least two outputs. The power supply unit comprises a signal processing and calculation unit that is set up to actuate the primary switch and the secondary switches by means of pulse generators. The outputs may be switched sequentially to provide at least two controllable output voltages.