A power conversion module includes a high-voltage side, a low-voltage side, a magnetic element, a high-voltage side circuit, and a low-voltage side circuit. The first end includes a high-voltage positive terminal and a high-voltage negative terminal. The second end includes a low-voltage positive terminal and a low-voltage negative terminal. The magnetic element includes two first windings. The high-voltage side circuit is electrically connected with the high-voltage positive terminal and the high-voltage negative terminal. The low-voltage side circuit is electrically connected with the low-voltage positive terminal and the low-voltage negative terminal. At least one AC loop includes at least one of the first windings, at least one part of the high-voltage side circuit and the low-voltage side circuit. The high-voltage side circuit and the low-voltage side circuit are located at a same side with respect to the magnetic element.

A power conversion module includes a high-voltage side, a low-voltage side, a magnetic element, a high-voltage side circuit, and a low-voltage side circuit. The first end includes a high-voltage positive terminal and a high-voltage negative terminal. The second end includes a low-voltage positive terminal and a low-voltage negative terminal. The magnetic element includes two first windings. The high-voltage side circuit is electrically connected with the high-voltage positive terminal and the high-voltage negative terminal. The low-voltage side circuit is electrically connected with the low-voltage positive terminal and the low-voltage negative terminal. At least one AC loop includes at least one of the first windings, at least one part of the high-voltage side circuit and the low-voltage side circuit. The high-voltage side circuit and the low-voltage side circuit are located at a same side with respect to the magnetic element.

An power converter includes an unfolder connected to a three-phase source and has an output connection with a positive terminal, a negative terminal and a neutral terminal. The unfolder creates two unipolar piece-wise sinusoidal DC voltage waveforms offset by a half of a period. A three-input converter connected to the unfolder produces a quasi-sinusoidal output voltage across output terminals. Switches of the converter selectively connect the positive, negative and neutral inputs across the output terminals. A PWM controller controls a first duty ratio and a second duty ratio for the converter based on a phase angle of the source and a modulation index generated from an error signal related to a control variable. The duty ratios are time varying with a fundamental frequency of the source. The modulation index relates to output voltage of the converter, peak voltage or current of the source and/or peak current at the output terminals.

A charger for a battery power system can include first and second switching bridges with inputs couplable to an AC source, at least one transformer having two or more primary windings (connected in series and coupled to the switching bridges) and at least two secondary windings, and second rectifier/chargers, each coupled to at least one of the secondary windings and couplable to at least one battery. The switching bridges may be respectively operable during positive and negative half cycles of the AC source to deliver an AC voltage to the transformer. The rectifier/chargers may be operable in a first mode to receive an AC voltage from the transformer and deliver a DC voltage for charging the respective battery. In some multi-battery embodiments, the rectifier/chargers may also be operable in a second mode to deliver an AC voltage from a respective battery to the transformer to balance charge between the batteries.

Provided are electrical circuits and methods for power factor correction. An example method includes receiving, by converter, an input voltage at a fundamental frequency and generating an output voltage; generating, based on the output voltage, a first measurement signal; subtracting a first reference signal from the first measurement signal to obtain a first error signal; generating an adaptive current sense signal, generating a reference voltage based on the input voltage, subtracting the reference voltage from the current sense signal thus generating a second measurement signal to control the current measurement; subtracting the second measurement signal from the input voltage to obtain a difference signal, wherein the difference signal is largely minimized by removing overtones of the fundamental frequency; generating, based on the difference signal, a second error signal; using a sum of the second error signal as a first order correction to the first error signal to regulate the converter.

Provided are electrical circuits and methods for power factor correction. An example method includes receiving, by converter, an input voltage at a fundamental frequency and generating an output voltage; generating, based on the output voltage, a first measurement signal; subtracting a first reference signal from the first measurement signal to obtain a first error signal; generating an adaptive current sense signal, generating a reference voltage based on the input voltage, subtracting the reference voltage from the current sense signal thus generating a second measurement signal to control the current measurement; subtracting the second measurement signal from the input voltage to obtain a difference signal, wherein the difference signal is largely minimized by removing overtones of the fundamental frequency; generating, based on the difference signal, a second error signal; using a sum of the second error signal as a first order correction to the first error signal to regulate the converter.

A substrate and a first circuit board each have an upper side and a lower side. The substrate lower side is connected to a cooling body. On the upper side of the substrate, first electronic switching elements connect an alternating current potential at a phase terminal to a high direct current potential at a first potential terminal and to a low direct current potential at a second potential terminal. Second electronic switching elements connect the alternating current potential to a middle direct current potential at a third potential terminal. The substrate is spaced from the first circuit board under the first circuit board lower side. The upper side of the substrate faces toward the first circuit board. The second switching elements are at least on the upper side of the first circuit board, possibly additionally also on the lower side of the first circuit board.

A multilevel stage of a bidirectional AC power converter, comprising: a set of switches in series, a set of capacitors in series, the set of capacitors being in parallel with the set of switches; a number of sets of diodes in series; a center tap along the set of switches in series; and a pair of taps, respectively after the first and before the last switch of the set of switches in series; wherein each node between respective capacitors is connected to a node between respective diodes. A converter first stage for a 3-level converter has 6 switches, two capacitors, and two diodes, with the junction between diodes connected to the junction between capacitors, and the diode legs between switches 2-3 and 4-5. The center tap is between switches 3-4, and the pair of taps between switches 1-2 and 5-6.

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 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.