A method, an apparatus and a computer device for detecting an open circuit fault are provided. The sample data of the electrical signal at the primary side of the transformer in the CLLLC resonant bidirectional DC/DC converter is performed with spectrum analysis to obtain a first frequency, and whether an open circuit fault occurs in the CLLLC resonant bidirectional DC/DC converter can be determined according to the first frequency and an actual switching frequency.

A power conversion module is disclosed. The power conversion module includes a circuit board, an adapter board, a first component and a second component. The second surface of the circuit board includes a concave region. The circuit board has four sidewalls. The first surface of the adapter board is attached to the second surface of the circuit board. The first surface of the adapter board includes a component disposing region, and the component disposing region is corresponding to the concave region. The first component is disposed in the concave region. A height of the first component is less than or equal to a depth of the concave region. The second component is disposed in the component disposing region and accommodated in the corresponding one of the concave region. A height of the second component is less than or equal to the depth of the concave region.

A neck pillow includes: a cushion portion worn on a user's neck and an electro-liquid driving unit mounted into the cushion portion, being bent in a shape of an arc, and including ferroelectric particles, each having an electrorheological property, and nonconductive liquid. The electro-liquid driving unit generates vibration by contraction and expansion that are repeated when an arrangement of the ferroelectric particles and the nonconductive liquid is changed according to whether drive current is applied. A low voltage power supply unit supplies low voltage electricity necessary to drive the electro-liquid driving unit and a high voltage control circuit unit converts low voltage direct current into high voltage direct current and supplies the drive current to the electro-liquid driving unit and adjusting micro-current to generate target vibration in the electro-liquid driving unit.

A power conversion system is provided. The power conversion system includes N power conversion circuits. Each power conversion circuit includes an input, an output, two switching power conversion units and at least one resonant capacitor. The input and output are configured to receive an input voltage and output an output voltage respectively. Each switching power conversion unit includes a plurality of switches and a winding. The plurality of switches operates periodically according to a switching period. A dotted terminal of one winding is electrically coupled to an undotted terminal of the other winding. The two windings are magnetically coupled to each other to form a transformer. In one switching period, the resonant capacitor stores an energy or outputs the stored energy as the corresponding switch is turned on or off. A resonance is generated between the resonant capacitor and inductor with a resonant frequency and a resonant period.

A switching converter has a first converter output for connection to a user load and a second converter output for connection to the user load. A first direct current rail power negative terminal has a first positive output and a first negative output connected to the second converter output. A second direct current rail power negative terminal has a second negative output and a second positive output connected to the first positive output. A first switch has a first positive terminal connected to the first positive output, a first negative terminal and a first control terminal. A second switch has a second positive terminal connected to the first negative terminal, a second negative terminal connected to the second negative output, and a second control terminal. A pulse width modulator has a first modulator output connected to the first control terminal, and a second modulator output connected to the second control terminal. An inductance is connected between the first converter output and the first negative terminal. A comparator controls the first pulse width modulator based on a voltage difference between a current measurement voltage that varies based on current through the inductance and a first set point voltage.

Circuit board, defining a plurality of switching arms connected in parallel so as to convert a first voltage into a second voltage, at least one of which is DC voltage. The board includes a plurality of controllable electronic switches mounted pairwise in series on either side of a midpoint, so as to produce the switching arms connected in parallel. A plurality of decoupling capacitors are connected in parallel to one another, and in parallel to the DC voltage. Two electrically conductive layers are arranged parallel to one other, one of which is at the highest potential of the DC voltage and the other of which is at the lowest potential of the DC voltage. Each of the decoupling capacitors having one terminal connected to one of these electrically conductive layers and its other terminal connected to the other of these electrically conductive layers.

A circuit arrangement for a resonant converter, wherein the resonant converter includes a galvanic isolation, where on the primary side the resonant converter includes a resonant inductor, a resonant capacitor and switching elements, which each have a switching frequency, where a resonant current flows through the resonant inductor and the resonant capacitor by switching the switching elements, where a bidirectional switching element is arranged in a current path of the resonant current flowing through the resonant inductor and the resonant capacitor, where a series circuit of a diode pair has a center connected to a terminal of the resonant inductor or resonant capacitor and each respective ends thereof to a switching element of the primary-side switching elements.

A switching bridge for the DC-DC stage of a power converter, the switching bridge having one or more sets of upper and lower series-connected switches (S1, S2) connected across a DC bus and arranged to be switched to provide an output AC voltage, the switching bridge further comprising a voltage divider (C1) arranged to vary the output AC voltage level according to the switching state of the switches.

In this power conversion device, a DC-DC converter substrate on which a DC-DC converter element is mounted is attached to a base portion along the front surface or back surface of the flat plate-shaped base portion.

This power conversion device includes an inverter, a DC-DC converter, and a flat plate-shaped base where the inverter and the DC-DC converter are disposed on the front side and the back side. The base includes a cooling flow path having a front side flow path disposed on the front side and a back side flow path connected to the front side flow path and disposed on the back side.