Richtek Technology Corporation

Mediatek Corporation

Fu-Chi Lin

Hung-Chi Huang

Wei-Jen Huang

Tsung-Nan Wu

Ming-Chiang Ting

Chih-Hua Hou

Wei-Shuo Wu

Mei-Shu Wang

A wireless power transmitter circuit includes: an inverter circuit including plural switches coupled to a resonant transmitter circuit; and a transmitter controller circuit for generating a PWM control signal, to control the plural switches, thus generating a wireless transmission power via the resonant transmitter circuit in a power supply procedure, so that a wireless power supply is accordingly provided to a wireless power receiver circuit. In a groping procedure, transmitter controller circuit controls the plural switches to generate a wireless test power via the resonant transmitter circuit based on an operation frequency. The groping procedure includes: measuring a peak of a transmission signal corresponding to the wireless test power; determining, according to the peak of the transmission signal, whether a foreign object exists and/or whether the wireless power receiver circuit is present. When it is determined that the wireless power receiver circuit is present, the power supply procedure is performed.

Wireless power transmitter circuit and method capable of detecting wireless power receiver and foreign object

A wireless power transmitter circuit generates a wireless transmitting power during a power supply procedure, and determines whether there is a corresponding wireless power receiver circuit near by the wireless power transmitter circuit during a groping procedure. The groping procedure includes: step S, generating a first analog groping transmitting signal; step S, determining whether there is an electromagnetic inductive object near by the wireless power transmitter circuit according to an electrical characteristic related to the first analog groping transmitting signal, and when yes, proceeding to step S, otherwise proceeding back to the step Safter a first predetermined period; step S: generating a digital groping transmitting signal; and step S, determining whether there is a corresponding wireless power receiver circuit near by the wireless power transmitter circuit according to a reflect signal.

Wireless power transmitter circuit having low power pinging and control circuit and method thereof

A wireless power transmitter circuit includes: a power stage circuit including plural switches coupled to a resonant transmitter circuit, wherein the resonant transmitter circuit includes a transmission coil and a resonant capacitor which are coupled to each other; and a transmission control circuit controlling the power stage circuit to convert an input power to a driving power according to a pulse width modulation (PWM) control signal when a corresponding wireless power receiver circuit is near by the resonant transmitter circuit. The driving power drives the resonant transmitter circuit to generate a wireless transmitting power, which is supplied to the corresponding wireless power receiver circuit. When a variation rate of a driving current of the driving power with respect to time exceeds a variation rate threshold, an operation parameter of the power stage circuit is adjusted to reduce a power level of the wireless transmitting power.

Wireless power transmitter circuit having OVP control for receiver circuit and control circuit and method thereof

A communication signal demodulation apparatus demodulates a communication signal to generate an output signal. The communication signal demodulation apparatus includes: plural sensor circuits which sense different electrical characteristics of one same communication signal and generate corresponding sensing modulation signals respectively; plural processing filters which filter the corresponding sensing modulation signals respectively and generate corresponding filtered modulation signals respectively; plural demodulators which demodulate the plural filtered modulation signals and generate corresponding demodulation signals respectively, wherein each of the filtered modulation signals corresponds to at least one of the demodulators; and a determination circuit which receive the plural demodulation signals, determine whether each unit signal of each of the demodulation signals is correct or not according to a determination mechanism, and combine one or more correct unit signals to generate the output signal.

Communication signal demodulation apparatus and communication signal demodulation method

A charging apparatus includes a DC switch circuit, a wireless power unit, a capacitive power conversion unit, and a switching power conversion unit. The charging apparatus operates in at least one of the following modes: in a constant current mode, the capacitive power conversion unit converts a bus current provided by the DC switch circuit or the wireless power unit to generate a predetermined constant charging current on a charging node to charge a battery; in a constant voltage mode, the switching power conversion unit converts a bus voltage provided by the DC switch circuit or the wireless power unit to generate a predetermined charging voltage on the charging node to charge the battery; in a first power output mode, the switching power conversion unit converts the battery voltage to generate an output voltage on a transmission interface pin.

Charging apparatus with multiple power paths

A power transfer circuit for transferring electrical power from a power source to a charger is provided. The power transfer circuit includes a voltage regulation circuit and a control circuit. The voltage regulation circuit is arranged for providing an output voltage for the charger, and adjusting the output voltage according to a control signal, wherein the charger draws an output current from the voltage regulation circuit according to the output voltage. The control circuit is coupled to the voltage regulation circuit, and is arranged for detecting the output current to generate a detection result, and generating the control signal at least according to the detection result.

Growing community of inventors

Hsinchu, Taiwan

Fu-Chi Lin