A power transfer system that transfers electric power from a power transmission device to a power reception device through electrical coupling. The power transmission device and the power reception device structurally designed such that the power transfer system is able to stabilize reference potentials of the power transmission device and the power reception device when the power reception device is placed on the power transmission device.

The present disclosure proposes a circuit for reducing power consumption and a liquid crystal. The circuit includes a transformer, a first output loop, and a second output loop. The transformer includes a secondary driving winding with a first output terminal, a ground terminal, and a second output terminal arranged between the first output terminal and the ground terminal. When a voltage output by the second output terminal is less than a predetermined voltage, the first output loop is conducted and the second output loop is terminated. When a voltage output by the second output terminal is greater than the predetermined voltage, the first output loop is terminated and the second output loop is conducted.

A resonant converter (100) includes at least two transistor switches (S1-S8), out of which at least two are connected in parallel, and out of which a number of available transistor switches (S1-S8) is available for performing a current switching of the resonant converter (100). A controlling module (101) is configured to determine whether an output power of the resonant converter (100) is below an output power threshold value. A switching module (102) is configured to employ a reduced number of transistor switches out of the number of available transistor switches (S1-S8), if the output power of the resonant converter (100) is below the output power threshold value. The reduced number is at least declined by one compared to the number of available transistor switches (S1-S8). The switching module (102) is configured to permute the employed reduced number of transistor switches over the available transistor switches (S1-S8).

A frequency generator for generating a working frequency for a transmission signal of a rail contact of an axle counter includes a series resonant circuit having a transmitter coil unit of the rail contact and a capacitor. The frequency generator has an inverter, the output of which is connected to the capacitor. The inverter is configured to generate an oscillating voltage and to feed the generated oscillating voltage to the transmitter coil unit of the rail contact via the capacitor. A current transformer synchronizes the output voltage of the inverter to the current in the series resonant circuit. A start-up circuit electrically connected to the inverter is configured to trigger the inverter and to be electrically connected to an input power supply. The frequency generator is a robust and effective circuit for generation of magnetic fields where manufacturing effort and expensive components can be reduced.

A frequency generator for generating a working frequency for a transmission signal of a rail contact of an axle counter includes a series resonant circuit having a transmitter coil unit of the rail contact and a capacitor. The frequency generator has an inverter, the output of which is connected to the capacitor. The inverter is configured to generate an oscillating voltage and to feed the generated oscillating voltage to the transmitter coil unit of the rail contact via the capacitor. A current transformer synchronizes the output voltage of the inverter to the current in the series resonant circuit. A start-up circuit electrically connected to the inverter is configured to trigger the inverter and to be electrically connected to an input power supply. The frequency generator is a robust and effective circuit for generation of magnetic fields where manufacturing effort and expensive components can be reduced.

The present invention relates to a resonant DC-DC power converter assembly comprising a first resonant DC-DC power converter and a second resonant DC-DC power converter having identical circuit topologies. A first inductor of the first resonant DC-DC power converter and a second inductor of the second resonant DC-DC power converter are configured for magnetically coupling the first and second resonant DC-DC power converters to each other to forcing substantially 180 degrees phase shift, or forcing substantially 0 degree phase shift, between corresponding resonant voltage waveforms of the first and second resonant DC-DC power converters. The first and second inductors are corresponding components of the first and second resonant DC-DC power converters.

The present invention relates to a resonant DC-DC power converter assembly comprising a first resonant DC-DC power converter and a second resonant DC-DC power converter having identical circuit topologies. A first inductor of the first resonant DC-DC power converter and a second inductor of the second resonant DC-DC power converter are configured for magnetically coupling the first and second resonant DC-DC power converters to each other to forcing substantially 180 degrees phase shift, or forcing substantially 0 degree phase shift, between corresponding resonant voltage waveforms of the first and second resonant DC-DC power converters. The first and second inductors are corresponding components of the first and second resonant DC-DC power converters.

The present invention relates in a first aspect to a galvanically isolated power converter assembly comprising a first set of electrically interconnected resonant power inverters configured for generating respective output voltages and output currents. The galvanically isolated power converter assembly further a first positive summing node and a first negative summing node configured to combining the output voltages and output currents of the first set of resonant power inverters and a first common load circuit comprising a positive load input and a negative load input. A galvanic isolation barrier comprises first and second common isolation capacitors electrically insulating the common load circuit. Each of the first and second common isolation capacitors possesses an official safety rating.

A bidirectional power converter circuit is controlled via a hysteresis loop such that the bidirectional power converter circuit can compensate in near real time for variations and even changes in transmit and receive coil locations without damaging components of the system. Because the bidirectional power converter is capable of both transmitting and receiving power (at different times), one circuit and board may be used as the main component in multiple wireless power converter designs.

A bidirectional power converter circuit is controlled via a hysteresis loop such that the bidirectional power converter circuit can compensate in near real time for variations and even changes in transmit and receive coil locations without damaging components of the system. Because the bidirectional power converter is capable of both transmitting and receiving power (at different times), one circuit and board may be used as the main component in multiple wireless power converter designs.