A resonant converter and a manufacturing method of a transformer thereof are provided. The resonant converter includes a full bridge circuit, an element, a first branch circuit, a second branch circuit and a secondary winding. The full bridge circuit includes a first node and a second node. The element includes an inductor or a capacitor. The first branch circuit includes a first primary winding. The second branch circuit includes a second primary winding, and the first and second primary windings have the same turn number. The transformer is constructed by the first and second primary windings and the secondary winding. The first branch circuit, the element and the second branch circuit are sequentially coupled in series between the first and second nodes. The first branch circuit and the second branch circuit are symmetrically located with respect to the element. The first and second branch circuits have the same impedance.

A resonant converter and a manufacturing method of a transformer thereof are provided. The resonant converter includes a full bridge circuit, an element, a first branch circuit, a second branch circuit and a secondary winding. The full bridge circuit includes a first node and a second node. The element includes an inductor or a capacitor. The first branch circuit includes a first primary winding. The second branch circuit includes a second primary winding, and the first and second primary windings have the same turn number. The transformer is constructed by the first and second primary windings and the secondary winding. The first branch circuit, the element and the second branch circuit are sequentially coupled in series between the first and second nodes. The first branch circuit and the second branch circuit are symmetrically located with respect to the element. The first and second branch circuits have the same impedance.

Power isolators for providing electrical isolation between an input port and an output port that exhibit low electromagnetic interference (EMI) are described. The low EMI may be achieved by, for example, canceling out a common mode current across a transformer in the power isolator that may be converted into EMI. The power isolator may include at least one oscillator circuit that is configured to apply a first signal to a first transformer and a second, different signal to a second transformer. The first and second signals may be configured such that the common mode current generated in each of the first and second transformers has an opposite direction. Thus, the common mode currents in the first and second transformers may at least partially cancel out. As a result, the EMI exhibited by the power isolator may be reduced.

The present disclosure provides a circuits for harvesting energy from an energy source. The energy source may have a first and a second potential of an input voltage. The circuits may further comprise one or more of a charging capacitor, transformers, transistors, or diodes. The circuits may be used for harvesting energy from thermoelectric generators.

A power source system includes a plurality of output circuits electrically connected to a plurality of second coils on a second side of a transformer unit, and a selection circuit to which power is supplied from the plurality of output circuits. Each of the plurality of output circuits is electrically connected to each of the plurality of second coils on the second side, and outputs DC power to the selection circuit based on AC power of the second coil on the second side. The selection circuit selects a supply destination of the power from a first conductive path and a second conductive path.

A welding current source for providing a welding current and a welding voltage at an output in order to carry out an arc welding process includes an input-side rectifier, an inverter, which is operated with a switching frequency, a transformer having a primary winding and at least two secondary windings, at least two rectifiers arranged between the secondary windings and the output, and at least one capacitor and one load resistor at the output. At least one current-limiting reactor is arranged on the second secondary winding and the load resistor for discharging the capacitor, which can be charged by the current-limiting reactor, the current-limiting reactor, and the capacitor are dimensioned in such a way that the maximum value of the no-load voltage at the output is greater than the voltage corresponding to the transmission ratio of the primary winding to the secondary winding of the transformer.

An interleaved LLC converter arrangement includes two or more LLC converters for transferring power from an input side to an output side, wherein the two or more LLC converters include a first LLC converter and a second LLC converter connected in parallel on the input side and on the output side and wherein each LLC converter includes a bridge inverter at the input side. For balancing the power transfer among the LLC converters if for example the second LLC converter transfers more power from the input side to the output side than the first LLC converter, each leg of the bridge of the bridge inverter of the first LLC converter is operated with a duty cycle of 0.5 and at least one leg of the bridge of the bridge inverter of the second LLC converter is operated with a duty cycle different from 0.5.

The disclosure relates to an electrical power system for providing a stabilised DC voltage to a power bus. Example embodiments include an electrical power system comprising: a DC power bus having first and second DC power bus terminals; an electrical storage unit having first and second terminals, the second terminal connected to the second DC power bus terminal; a DC:DC converter having first and second DC:AC converters and a transformer connected between the first and second DC:AC converters, the first DC:AC converter connected between the first terminal of the electrical storage unit and the first DC power bus terminal; and a controller connected to control a switching operation of one or both of the first and second DC:AC converters.

The disclosure relates to an electrical power system for providing a stabilised DC voltage to a power bus. Example embodiments include an electrical power system comprising: a DC power bus having first and second DC power bus terminals; an electrical storage unit having first and second terminals, the second terminal connected to the second DC power bus terminal; a DC:DC converter having first and second DC:AC converters and a transformer connected between the first and second DC:AC converters, the first DC:AC converter connected between the first terminal of the electrical storage unit and the first DC power bus terminal; and a controller connected to control a switching operation of one or both of the first and second DC:AC converters.

A drive circuit for a dimming glass, a dimming glass device, and a drive method are disclosed. The drive circuit for the dimming glass includes: a controller, an input terminal of the controller receiving a control instruction, and configured to output a voltage control signal at an output terminal of the controller according to the control instruction; and a voltage adjustment circuit, a control input terminal of the voltage adjustment circuit being connected to the output terminal of the controller, a power input terminal of the voltage adjustment circuit being connected to a first power supply, and a voltage output terminal of the voltage adjustment circuit being connected to a voltage input terminal of the dimming glass, and configured to generate an output voltage signal at the voltage output terminal of the voltage adjustment circuit according to the voltage control signal.