Abstract:
For wireless power transfer, an energy field is formed by a power transmitter in a space near a transmission coil to provide a transmission power in the space of the energy field. A transferred power is receiver by a power receiver through a reception coil in the space of the energy field. An amount of the transferred power is reduced by the power receiver by performing a regulating operation using a switching frequency when the transferred power is excessive. The power transmitter detects a switching frequency signal having the switching frequency that is induced in the transmission coil when the power receiver performs the regulating operation. The power transmitter controls adjustment of the transmission power in response to the detection of the switching frequency signal. The transmission power is adjusted without a data communication for adjustment of the transmission power between the power transmitter and the power receiver.
Abstract:
A phase locked loop includes a signal receiver configured to generate a mixed signal based on the received signal and an oscillator signal, and a frequency control circuit configured to compare the mixed signal to a reference signal, and adjust the oscillator signal based on a result of the comparing.
Abstract:
Provided is an image sensing device that includes a detector configured to detect a terahertz wave signal received by a receiving antenna, a voltage-controlled oscillator configured to output an oscillation frequency according to an output voltage of the detector, and a frequency digital converter configured to convert the oscillation frequency output from the voltage-controlled oscillator to a digital signal.