Nxp B.v.

Xuechu Li

Fuchun Zhan

Jian Qing

Yan Jiang

Suming Lai

Tinghua Yun

Kenneth Chung Yin Kwok

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

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

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.

Growing community of inventors

Shanghai, China

Xuechu Li