Apple Inc.

Di Zhao

Xingqun Li

Jahan C Minoo

Daniel C Wagman

Ching Yu John Tam

Robert D Zupke

Derek J DiCarlo

Tony Chi Wang Ng

Weiyun Chen

Chi Kin Ho

Carlos Ribas

Evan J Thompson

Nagendra Bage Jayaraj

Roderick D Bacon

Surya Musunuri

Stephen Christopher Terry

Jay B Fletcher

Sanjay Pant

Talbott Mead Houk

Stephen J Hrinya

Yongxuan Hu

Siarhei Meliukh

Nikola Jovanovic

Nathan F Hanagami

Wenxun Huang

Floyd L Dankert

Alessandro Molari

Bin Gu

Ludmil N Nikolov

Hartmut Sturm

Sivasankari Krishnanji

Ruchi Jagdish Parikh

Seyedeh Maryam Mortazavi Zanjani

Tristan R Hudson

Chad L Olson

Baifeng Chen

John J Sullivan

Nicola Florio

Chao Ma

Jonathan A Dutra

Michael D Black

Khaleel Shaik

The present disclosure describes a system with a power management device, a wakeup circuit, a battery management device, and a connector. During a powered down mode of operation, the battery management device can provide, via the connector, a bias voltage to the wakeup circuit. In response to a wakeup switch being activated, the battery management device can provide a power supply (e.g., from a battery) to the power management device. Benefits of the wakeup circuit include (1) a reduction of battery consumption—and thus improving battery lifetime—when the electronic system is in a powered down mode of operation because the wakeup circuit has lower number of active components compared to other designs and (2) a non-complex wakeup circuit design because one or more existing connector interconnects between the power management device and the battery management device can be re-used during electronic system's powered down mode of operation.

Wakeup circuit

A battery powered electronic device can include a wireless power system configured to receive power from a wireless power transmitter, a converter coupled to the wireless power system that converts a voltage from the wireless power system to a battery charging voltage, a battery comprising at least two cells, a power management unit that delivers power from one or more of the at least two cells to one or more subsystems of the electronic device, and a plurality of switching devices connecting the at least two cells, the converter, and the power management unit. The plurality of switching devices can be arranged so that a first switching configuration connects the cells in series for charging from the converter and a second switching configuration connects the cells in parallel for delivering power to the power management unit.

Power system configurations for wireless charging

A multi-cell battery powered device can include at least one power input, a first power converter coupled between the power input and a battery bus, a second power converter coupled between the battery bus and a system load of the electronic device, a plurality of cells, and a plurality of primary battery protection switches. The primary battery protection switches can be selectively operable to couple the plurality of cells in: (1) a parallel configuration in which the cells are coupled to the battery bus so as to charge or discharge in parallel, (2) a series configuration in which the cells are coupled to the battery bus so as to charge or discharge in series, and (3) an isolated configuration in which at least one of the plurality of cells is coupled to the battery bus and at least one of the plurality of cells is disconnected from the battery bus.

Battery charging protection and health management system

A switching power converter circuit may include output voltage overshoot mitigation circuitry that can modify operation of the converter responsive to an overvoltage condition by switching from a pulse width modulation (PWM) mode to a pulse frequency modulation (PFM) mode. A clamp may be provided to clamp a control voltage or a compensating capacitor voltage of the main output voltage control loop (e.g., a PWM control loop) to a control voltage of the PFM loop. An output pull down circuit may be provided to temporarily apply a load to the converter output.

Peak voltage overshoot control for switch mode power converters

An electronic device may receive or provide power using bidirectional wired and wireless power converters. A bypass path may be included to bypass the battery charger and to allow direct power transfers from a connector of the electronic device to the wireless power converter or from the wireless power converter to the connector of the electronic device. Current limiting and regulation circuitry may also be included.

Multimode battery charging

A voltage of a first pin that is one of several pins of an external connector of a system is measured, while the first pin is un-driven except for being pulled to ground through a first resistance, and a second pin of the external connector is being used as a power supply rail of the system. The measured voltage is compared to a short circuit threshold and in response to that threshold being exceeded, the power supply voltage on the second pin is reduced. In such an embodiment, no test stimulus needs to be applied to any of the pins of the external connector. Other embodiments are also described and claimed.

Corrosion mitigation for an external connector of an electronic device

A power converter may be adapted to provide an output voltage from one of two input voltages. The power converter may include two or more buck converters that share a plurality of power converter components and each converts an individual input voltage to the output voltage. The power converter may include any of a variety of charge equalizing components that may be coupled between input terminals and optional input capacitors, which are coupled between the input terminals and ground. The charge equalizing component(s) provide(s) a fast conduction path for the equalization of input voltages and charge/voltage of the optional input capacitors. The charge equalizing component(s) can mitigate large currents created by differential voltages between the input terminals, which currents would otherwise flow through and potentially damage or destroy the power converter's switching devices.

Fast charge sharing between capacitors of a dual input path DC/DC converter

Growing community of inventors

Santa Clara, CA, United States of America

Di Zhao