3 results about "Inductive coupling" patented technology

A transponder and a method for wireless data transmission is provided. The transponder comprises an input circuit with input terminals for connecting an antenna coil for data transmission to a base station by means of inductive coupling, a first controllable switching means, at least one resistor, which is looped in series with the first controllable switching means between the input terminals of the input circuit, and a controller which is designed in such a way that it connects through the first switching means as soon as a voltage applied at the input terminals falls below a first settable threshold value, and again interrupts it as soon as the voltage applied at the input terminals for a settable duration is above the first settable threshold value and/or above a second settable threshold value.

The invention relates to a low-input current ripple high-gain soft switching direct current converter, which comprises an input port, a load port, a first switch tube, a second switch tube, a first diode, a second diode, a third diode, an input inductor, a coupling inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a load. According to the invention, through complementary control of the two switch tubes, zero-voltage conduction of the two switch tubes and zero-current turn-off of the three diodes can be realized; and the low-input current ripple high-gain soft switching direct current converter has the advantages of high voltage gain, small input current ripple, high conversion efficiency, small switching tube voltage stress and the like, and is very suitable for a non-isolated renewable energy power generation system.

A downhole charging system comprising a primary side and a secondary side is provided. The primary side comprises a power transmit coil arranged to receive power from a power source with a source frequency and the secondary side 5 comprises a power receive coil arranged to deliver power to a load. The power transmit coil and the power receive coil are further arranged such that they are inductively coupled. The primary side and/or the secondary side comprises at least one tunable element connected to the coil on the same side as the tunable element. The system further comprises at least one controller configured to control the 10 impedance of the tunable element such that the impedance of the tunable element and the coil on the same side as the tunable element is optimised in view of powertransfer.