Texas Instruments Corporation

Dingkun Du

Gianpaolo Lisi

Jingwei Xu

Erhan Ozalevli

Mustapha El Markhi

Tuli Luthuli Dake

Sombuddha Chakraborty

Gerard G Socci

Nachiket Venkappayya Desai

Patrick Michael Teterud

Rajaram Subramonian

Theodore Ernest Yu

Sakshi Arora

Ali Motamedi

Keith Thomas Sanders, Jr

Patrick Teterud

A wireless power transfer system using a resonant rectifier circuit with capacitor sensing. A wireless power transfer system includes a power receiver resonant circuit and a synchronous rectifier. The power receiver resonant circuit includes an inductor and a capacitor connected in series with the inductor. The synchronous rectifier is configured to identify zero crossings of alternating current flowing through the inductor based on voltage across the capacitor, and control synchronous rectification of the alternating current based on timing of the zero crossings.

Resonant rectifier circuit with capacitor sensing

A wireless power transfer system includes a wireless power receiver having a rectifier. The rectifier includes switches. The wireless power receiver is operable to control the switches for ensuring a complex impedance at the input of the rectifier.

Adaptive rectifier and method of operation

In described examples, a switching mode power supply includes an output filter, a driver, a pulse width modulator, and pulse adaptation circuitry. The output filter is configured to provide output of the switching mode power supply. The driver is coupled to the output filter and is configured to switch current to the output filter. The pulse width modulator is configured to generate pulses that control switching of current by the driver. The pulse width modulator includes spread spectrum logic configured to randomize timing of the pulses generated by the pulse width modulator. The pulse adaptation circuitry is configured to identify an instantaneous excursion of the output of the switching mode power supply beyond a predetermined threshold, and to modify the randomized timing of the pulses produced by the pulse width modulator based on the identified instantaneous excursion.

Switching mode power supply with adaptively randomized spread spectrum

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Dingkun Du