An LLC converter includes a switch module, a transformer, an output circuit, a resonant circuit and a safety capacitor. The switch module is connected between an input voltage and a ground. The transformer has a primary side winding and at least one secondary side winding. The output circuit is connected between the at least one secondary side winding and a load. The resonant circuit is coupled between the primary side winding and the switch module and includes at least one leakage inductor. The safety capacitor is connected between the at least one leakage inductor and the switch module.

This system for converting the electrical energy delivered by a supply network comprises of: a converter and at least one zero-sequence current limiting stage flowing in the converter. The or each limiting stage comprises an active compensation circuit comprising a magnetic component and a voltage source connected to the magnetic component, the voltage source and the magnetic component being adapted to serially inject with the converter an active compensation voltage of the zero-sequence voltages generated by the converter.

A vehicle includes an inverter having first and second half bridges configured to provide multiphase voltage to an electric machine. The vehicle further includes a controller configured to activate a switch of the first half bridge and pulse width modulate a switch of the second half bridge to conduct resonant output on a rail of the inverter to the electric machine such that the multiphase voltage is created for at least a sixth of a cycle of the electric machine. The activation is responsive to a torque command.

The present disclosure relates to current source inverters (CSIs), and in particular to soft-switching current source inverters (SSCSIs). An exemplary CSI comprises a first CSI bridge, a second CSI bridge, a DC-link inductor, and a resonant tank. The first CSI bridge can be operatively connected to a first power bank. The second CSI bridge can be operatively connected to a second power bank. The DC-link inductor can be connected in series between the first and second CSI bridges. The resonant tank can be connected in parallel with the DC-link inductor.

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.

In order to provide a power conversion device capable of estimating a load voltage with high accuracy without directly detecting the load voltage to be applied to a load, a control circuit is provided, which includes a means for estimating the load voltage to be applied to the load based on an electric current of a resonant circuit, an AC frequency of an inverter and an electrostatic capacitance of the load, or a means for estimating the load voltage based on the electric current of the resonant circuit, the AC frequency of the inverter, an inductance of a resonant coil and a correction coefficient previously set from a relationship between a voltage of the resonant coil and the load voltage, and which controls an output to a target load voltage based on the estimated load voltage.

A converter is configured for connecting between a solar cell and an inverter configured to convert direct-current power output from the solar cell into alternating current power, and the converter is configured to increase the potential-to-ground at the negative terminal of the solar cell to greater than the potential-to-ground at the negative terminal of the inverter when outputting the direct-current power generated by the solar cell to the inverter side.

The disclosure relates to variable power modular electronic systems for generating unipolar and bipolar electrical pulses and associated uses thereof. In an embodiment, such a system includes one or more pulse generators for generating electrical pulses that can be connected in series; a charging circuit for charging the pulse generators; and a controller communicatively coupled to the pulse generators and the charging circuit. Advantageously, each pulse generator may include an AC/DC rectifier and a DC/AC inverter connected to said AC/DC rectifier in a bridge configuration to generate bipolar output electrical pulses or pulse trains. In addition, the charging circuit may include a DC/DC step-up converter connected to an indirect DC/AC inverter. The system provided in various embodiments of the disclosure also provides a great versatility for adaptation to various applications and high output voltage and current values.

A device for protecting an inverter include a first power switch configured to be turned on when a first voltage signal from a first switch of a safety relay is applied thereto; a second power switch connected in series with the first power switch, wherein the second power switch is configured to be turned on when a second voltage signal from a second switch of a safety relay is applied thereto; and a power line for connecting the first power switch and the second power switch to each other in series and for connecting the series of the first power switch and the second power switch to a buffer of the inverter, wherein a third voltage signal is applied via the power line to the buffer.

A resonant inverter apparatus supplies a high AC voltage to a discharge load. In this apparatus, an inverter circuit converts a DC voltage to an AC voltage using a plurality of switching elements. A transformer steps up the AC voltage and generates a high AC voltage. A DC voltage detecting unit detects a value of a DC voltage supplied to the inverter circuit. A control unit generates a driving pulse for performing on/off switching of the switching elements. The switching elements include first and second switching elements. The control unit performs phase angle control of the driving pulse. In response to the detected value of the DC voltage being greater than a reference value, the control unit sets a switching phase angle of the second switching element relative to the first switching element serving as reference, based on the magnitude of the valued of the DC voltage.