Nxp B.v.

Tinghua Yun

Jian Qing

Fuchun Zhan

XinDong Duan

Mingliang Wan

Chao Chen

Fang Liu

Peter Christiaans

Feng Cong

Hongyun Zhang

Shuiwen Huang

Xuechu Li

Jinxi Yan

A synchronous rectifier converts an AC input into a DC output. The synchronous rectifier has four switches controlled by four switch control modules. Each switch is connected between a different AC component and either the DC output or ground. Each switch control module has digitally assisted 'switch on' circuitry that detects 'on' bounces in the corresponding AC component to control when to turn on the corresponding switch and digitally assisted &#x201c;switch off&#x201d; circuitry that detects &#x201c;off&#x201d; bounces in the AC component to control when to turn off the corresponding switch. The &#x201c;switch on&#x201d; circuitry has a digitally assisted comparator to detect threshold crossings in the AC component, and the &#x201c;switch off&#x201d; circuitry has a digitally assisted programmable delay cell to turn off the switch for a predetermined duration following each detected threshold crossing.

Synchronous rectifier for wireless charging system

In a wireless charging system having a power transmitter (TX) and a power receiver (RX), the RX has a rectifier that rectifies an AC power signal received wirelessly from the TX into a rectified DC power signal. The RX also has regulation modules that monitor the DC power signal at various different voltage regions having one or more different high-voltage regions and one or more different low-voltage regions. Each regulation module affects operations of the wireless charging system in a different way. The regulation modules protect the RX from both over-voltage and under-voltage conditions.

Dynamic regulation of wireless charging system

An integrated circuit (IC) includes a switch transistor, a gate driver circuit, a current sensor circuit, a voltage drop regulation circuit, and a charge-release circuit. The switch transistor is connected between input and output ports of the IC, and receives an input signal from a power source and provides the input signal as an output signal to the output port. The current sensor circuit detects the current through the switch transistor. The gate driver circuit drives the switch transistor using a control signal. The voltage drop regulation circuit is activated when the current flowing through the switch transistor is low. The voltage drop regulation circuit controls the control signal to increase the voltage across the switch transistor. When the power source is disconnected, the charge-release circuit transfers residual charge from the input port of the IC to ground.

Integrated circuit with reverse current protection and power source disconnection detection

Methods for bidirectional communication and bidirectional communication buffers are described. In one embodiment, a method for bidirectional communication using first and second communication buses, which have opposite directions of data transmission, is described. The method for bidirectional communication involves detecting a signal from a first communication bus and buffering the detected signal and transmitting the buffered signal through a second communication bus while blocking data transmission from the second communication bus. Other embodiments are also described.

Method and system for bidirectional communication

A load switch includes a switch element and first and second control circuits. The switch element has an input terminal for receiving an input voltage, an output terminal for providing an output voltage, and a control terminal for receiving a switch signal, which turns the switch element on and off. The first control circuit is connected to the control terminal of the switch element and turns off the switch element in response to a first control signal. The second control circuit also is connected to the control terminal of the switch element and keeps the switch element turned off, after the first control circuit has turned off the switch element.

Load switch and method of switching same

A current clamp circuit includes a current-source circuit, a current-sense circuit, and a feedback circuit. The current-sense circuit includes a transistor, a resistive network, and a multiplexer. The transistor outputs a sensed current signal having a current that is equal to a current of an output signal provided by the current-source circuit. The feedback circuit limits the current of the sensed current signal and the output signal below a threshold current. The multiplexer modifies a resistance of the resistive network based on a first control signal. The multiplexer circuit and the feedback circuit are programmed using the first control signal and a second control signal when the transistor operates in a linear region and in a saturation region, respectively, to accurately output the sensed current signal.

Current clamp circuit

Embodiments of a method and system are disclosed. One embodiment of a method for address decoding in a data communications system using a serial data transfer bus is disclosed. The method involves, detecting a start command from a master device of the data communications system at the serial data transfer bus, and disabling an address decoder of a slave device of the data communications system in response to the detecting the start command.

Growing community of inventors

Shanghai, China

Tinghua Yun