Nxp B.v.

Nxp Usa, Inc.

Jian Qing

Tinghua Yun

XinDong Duan

Fuchun Zhan

Feng Cong

Mingliang Wan

Hongyun Zhang

Xuechu Li

Chao Chen

Fang Liu

Yan Jiang

Junmou Zhang

Peter Christiaans

Suming Lai

Dongyong Zhu

Bo Cai

Kenneth Chung Yin Kwok

Zhongmeng Chen

Shenglan Tang

The disclosure relates to a switched capacitor converter (SCC) with gate driving circuits for limiting currents provided by switching field effect transistors. Embodiments disclosed include an SCC with gate driver curcuits providing gate voltage signals to power FETs, each gate driver circuit comprising first and second gate driver modules and configured to operate in: a first mode in which the first gate driver module provides a gate voltage signal to a power FET that switches between first and second voltage rails by operation of first and second switches connected between the pair of voltage rails; and a second mode in which, in reponse to enabling of a current limit switching signal, the first gate driver module disables switching of one of the first and second switches and the second gate driver module operates to limit a current provided to the power FET.

Switched capacitor converter

A wireless battery charging system includes a trickle power device (e.g., FET) that generates a trickle charging current for charging a battery and a trickle charging regulator that controls the trickle power device. A fast charging device generates a fast charging current for charging the battery, where the fast charging current is greater than the trickle charging current. A fast charging regulator controls the fast charging device. A digital control module generates a trickle charging codeword to control the trickle charging regulator and a fast charging codeword to control the fast charging regulator. Each charging regulator has a programmable current mirror that generates a mirrored current signal based on a codeword from the digital control module. The digital control module instructs the charging regulators to control the power devices to operate in a trickle charging mode, a fast charging mode, and transitions between those modes.

Dual-loop battery charging system

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

Aspects of the present disclosure are directed to circuitry to control a gate voltage. As may be implemented in accordance with one or more embodiments, a voltage level is controlled for a field effect transistor (FET) having a floating gate and a target operating voltage above which the FET would be overcharged and around which the FET has a nominal operating range. Pulse circuitry is configured to apply energy to the floating gate in pulses, in operation the applied energy being pulsed low relative to the gate's target operating voltage, and then being changed by adjusting successive pulses until the gate reaches the target operating voltage. A feedback circuit samples a voltage level of, and enables the pulse circuitry to apply pulsed energy to, the floating gate for directing operation of the FET based on the target operating voltage in the nominal operating range.

Gate voltage control

A surge protection circuit includes a DC trigger circuit that generates a trigger signal when a surge pulse occurs, and a surge protection device, coupled to the DC trigger circuit, that generates a clamp voltage as an output voltage of the surge protection circuit and conducts surge currents to ground in response to the trigger signal. A feedback circuit is provided between the surge protection device and the DC trigger circuit. The feedback circuit lowers the clamp voltage so that it does not exceed a failure voltage of the surge protection device.

Surge protection circuit with feedback control

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

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

There is disclosed a single-wire Interface bus transceiver system comprising: an I2C master, a master transceiver, a signal wire, a slave transceiver and an I2C slave, wherein the master transceiver is adapted to encode master data SDA and master clock SCL received from I2C master using Manchester code, generate master single wire signal and transfer it to the slave transceiver through the signal wire, the master transceiver is also adapted to decode Manchester-encoded slave signal received from the signal wire and transfer the decoded slave data to I2C master; the slave transceiver is adapted to encode slave data received from I2C slave using Manchester code, generate slave single wire signal and transfer it to the master transceiver through the signal wire, the slave transceiver is also adapted to decode Manchester-encoded master signal received from the signal wire, generate the recovered master clock and transfer the decoded master data and recovered master clock to I2C slave.

Single-wire interface bus transceiver system based on I2C-bus, and associated method for communication of single-wire interface bus

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.

Method and system for address decoding in a data communications system using a serial data transfer bus

A low drop-out voltage regulator (LDO) includes an LDO unit, a switch circuit, a charge pump, and an initiation circuit. The switch circuit is coupled to a voltage input terminal and outputs a selected input voltage. The LDO unit receives the selected input voltage from the switch circuit and generates a regulated output voltage. The charge pump is coupled to the LDO unit to receive the regulated output voltage, and generate a control signal that is provided to the switch circuit. The initiation circuit receives the input voltage and generates an initiation voltage that greater than the regulated output voltage. The initiation voltage is provided to the charge pump circuit, along with the regulated output voltage. The initiation voltage drives the charge pump circuit when the regulated output voltage is not large enough to drive the charge pump circuit.

Low drop-out voltage regulator and method of starting same

Embodiments of a power-on and brown-out detector are described. In an embodiment, a power-on and brown-out detector for a power supply includes a power-on detection module, a brown-out detection module, and a logic module. The power-on detection module is connected to the power supply and is configured to generate a power-on signal in response to a voltage increase of the power supply. The brown-out detection module is connected to the power supply and is configured to generate a brown-out signal in response to a voltage charge by the power supply and a subsequent voltage decrease of the power supply. The logic module is configured to generate a control signal in response to the power-on signal and the brown-out signal. The power-on detection module is further configured to be activated or deactivated by the control signal. Other embodiments are also described.

Growing community of inventors

Shanghai, China

Jian Qing