A multi-phase boost converting apparatus includes a multi-phase boost converter and a passive lossless snubber, wherein the passive lossless snubber includes a first resonant capacitor, a second resonant capacitor, an output-end first unidirectional conduction component, an output-end second unidirectional conduction component, an input-end first unidirectional conduction component, an input-end second unidirectional conduction component and a resonant inductor.

A switching power supply comprises a power converter having a transformer, a low side switch configured to draw current from a supply voltage through a primary winding of the transformer and a high side switch configured to couple the primary winding of the transformer to a snubber capacitor. A controller is configured to synchronously control the opening and closing of the low side switch to form a regulated output voltage. A first voltage is generated at a node between the low side switch and the high side switch. The controller is further configured to open the high side switch during each switching cycle when the first voltage reaches a determined level. The determined level is higher than the supply voltage by an amount that is adjusted dependent on a monitored level of the supply voltage.

A spike suppression circuit includes a wide bandgap transistor, a first transistor, a clamping circuit, and a capacitor. The wide bandgap transistor is depletion-type. The first transistor is coupled in series with the wide bandgap transistor. The clamping circuit provides a voltage difference, and is coupled to a common node between the wide bandgap transistor and the first transistor. The capacitor provides a supply voltage for the clamping circuit. When the first transistor is turned off, the capacitor can recycle spike energy at the common node.

This disclosure describes systems, methods, and apparatus for reducing ripple in a pulsed waveform power generation system, often for use providing power to a plasma processing chamber. A snubber can be provided between a DC power supply and a switching circuit. A buck converter can also be provided between the snubber and the switching circuit, where the buck converter takes its input from within the snubber and in particular from between a rectifying and capacitive component of the snubber. In this way, the buck converter can be isolated from the DC power supply via an input inductor on a high-input line from the DC power supply.

A control circuit controls a switching element including a gate and a source corresponding to the gate. The control circuit includes an inductor, a circuit element, and a resistor. The inductor is connected between the gate and the source of the switching element. The circuit element is connected in series to the inductor between the gate and the source. The circuit element allows an electric current to flow therethrough in response to generation of electromotive force in the inductor. The resistor is connected in parallel to the inductor and the circuit element between the gate and the source.

An inductive power receiver 3 comprising: a power pick up stage 9; and a power rectification and regulation stage 10 including a rectifier having a plurality of control devices, wherein at least one of the control devices is a controllable AC switch, wherein the receiver is configured to switch the at least one AC switch according to an open circuit control strategy.

A circuit and method for converting an input AC voltage of a source to an output AC voltage of a destination is disclosed. The circuit may include a main switch cell coupled to the source, a freewheeling switch cell coupled to the main switch cell, a first inductor coupled to the main switch cell, the freewheeling switch and the destination, and a second inductor coupled to the first inductor, the main switch cell, the freewheeling switch and the destination. The circuit may also include a plurality of current paths when at least one of the main switch cell and/or the freewheeling switch cell is on. In some implementations, the main switch cell and the freewheeling switch cell are controlled using a switching method.

A power converter apparatus employs an energy recovery auxiliary circuit to suppress overvoltage oscillations and achieve high efficiency in a resonant LLC power converter system having high power density. The power converter apparatus includes an inverter configured to receive a DC input power and produce an AC voltage, a resonant tank including a resonant inductor and a resonant capacitor coupled between the AC voltage and a primary winding of a transformer, a rectifier configured to produce a DC output power coupled to a secondary winding of the transformer. The power converter suppresses overvoltage oscillations on rectifier switches by employing an energy recovery auxiliary circuit to transfer, during a transition period, current from the secondary side to a clamping capacitor conductively coupled to the primary side of the converter. The energy is then recovered during a subsequent power transfer cycle, thereby improving overall efficiency of the power converter.

A switching power supply comprises a power converter having a transformer, a low side switch configured to draw current from a supply voltage through a primary winding of the transformer and a high side switch configured to couple the primary winding of the transformer to a snubber capacitor. A controller is configured to synchronously control the opening and closing of the low side switch and the high side switch so as to form a regulated output voltage. A first voltage is generated at a node between the low side switch and the high side switch. The controller is further configured to open the high side switch during each switching cycle when the first voltage reaches a determined level. The determined level is higher than the supply voltage by an amount that is adjusted dependent on a monitored level of the supply voltage.

The electrical energy conversion system comprises: a converter including E first switching assembly or assemblies, each associated with an input voltage and including two first switches; N second switching assembly or assemblies, each associated with an output voltage and including two second switches; and at least one piezoelectric assembly connected to a switch; E>1, N>1; a control device configured for controlling, during a resonance cycle, a switching of the switches so as to alternate phases at constant voltage and phases at constant load across said piezoelectric assembly or assemblies.

The converter comprising an electrical transformer having a primary winding connected to a first switching assembly and a secondary winding connected to a second switching assembly, and each piezoelectric assembly being connected between a switch and a winding.