O2 Micro, Incorporated

O2micro International Limited

Southwest Jiaotong University

02 Micro International Limited

Huawei Technologies Co., Limited

Jianping Xu

Chun Lu

Stefan Maireanu

Tiesheng Yan

Luyang Luo

Lin Tang

Ching-Chuan Kuo

Xinhe Su

Feng Lin

Rong He

Yongqiang Yu

Alex Hartular

Jianlong Gao

Xiaodong Wang

Xiaohua Lei

Zhitong Lei

Mingzhi He

Zhengge Chen

Songrong Wu

The disclosure provides a portable charging device with kinetic energy recovery comprising a machine body, a kinetic energy recovery component, an AC-DC electric energy conversion component, and an energy storage component. The kinetic energy recovery component is embedded in the machine body by a locking assembly, and comprises a ring body, two springs, a conductor coil, a permanent magnet sphere, a guide rod, two sealing covers, and two bumps. The two sealing covers are symmetrically and fixedly attached to both sides of the ring body, and the middle part of the ring body and the two sealing covers form a vacuum cavity. The energy storage component is arranged at the right side of the machine body. The AC-DC electric energy conversion component is arranged at the bottom side of the machine body, and two first conductive blocks are electrically connected to the AC-DC electric energy conversion component.

Portable charging device with kinetic energy recovery

A circuit for driving a light-emitting diode (LED) light source includes a converter, a saw-tooth signal generator, and a controller. The converter includes a switch which is controlled by a driving signal. The converter provides a sense signal indicating the current through said LED light source. The saw-tooth signal generator generates a saw-tooth signal based on the driving signal. The controller generates the driving signal based on signals including the saw-tooth signal and the first sense signal to adjust the current through the LED light source to a target level and to correct a power factor of the driving circuit by controlling an average current of the input current to be substantially in phase with said input voltage.

Circuits and methods for driving light sources

An AC-to-DC converter for converting an AC voltage to a DC voltage includes a first converter, a second converter, a sense circuit, a controller, and an enabling circuit. The first converter converts an AC voltage to a first DC voltage. The second converter converts the first DC voltage to a second DC voltage. The sense circuit coupled to the first and second converters provides a first sense signal indicative of the first DC voltage and a second sense signal indicative of the AC voltage. The controller coupled to the first and second converters controls the first and second DC voltages. The enabling circuit coupled to the sense circuit generates a control signal to the controller to disable both the first converter and the second converter by comparing the first sense signal to a first threshold voltage and comparing the second sense signal to a second threshold voltage.

Circuits and methods for alternating current-to-direct current conversion

A power supply system can include a primary power supply coupled to an output, and a secondary power supply coupled to the output. The primary power supply provides power to the output when a voltage level of the secondary power supply is less than a first predetermined level. The secondary power supply provides power to the output when the voltage level of the secondary power supply is greater than the first predetermined level. The secondary power supply not only provides power to the output, but also charges the primary power supply when the voltage level of the secondary power supply is greater than a second predetermined level that is greater than the first predetermined level.

Power supply topology

In one embodiment, a battery management system includes a charger controller for controlling a charging current of a battery according to a status of a load which is powered by the battery, and a counter coupled to the charger controller for determining a charging time according to such status. Advantageously, a first charging current is selected when the load is off. A second charging current that is less than the first charging current is selected when the load is on. Furthermore, a frequency of the counter is set to a first frequency when the load is off. The frequency is set to a second frequency that is less than the first frequency when the load is on.

Topology and method for dynamic charging current allocation

A power system for managing charging, discharging and protection of rechargeable batteries is disclosed. The power system mainly includes a power system. The power system includes a switching circuit coupled to the rechargeable batteries to charge and discharge the rechargeable batteries. The power system includes a power management unit to control the switching circuit. The power system includes a temperature sensing circuit to monitor a temperature of the batteries, voltage detectors to monitor voltages of the batteries, and current detectors to monitor a current of the batteries. If an abnormal condition is sensed by the power management unit when the power system is in an operating mode, the power management unit will terminate the operating mode by switching off the switching circuit to protect the batteries and the power system.

Power management circuit for battery pack

A power management device for enabling multiply power sources to supply power to a load. The power management device includes a plurality of switches and a control logic. The plurality of switches are coupled to a plurality of power sources respectively and each switch coupled to each power source. The control logic is capable of selecting a set of switches among the plurality of switches to cooperate in a time-divided fashion to allow the power sources to provide power to the load. The set of switches is selected based on an electrical requirement of the load and an electrical condition of each switch.

Power management system with multiple power sources

Growing community of inventors

Chengdu, China

Jianping Xu