The present invention relates to a switching power-supply circuit comprising: rectifying and smoothing means for generating a rectified and smoothed voltage and outputting the rectified and smoothed voltage as a direct-current input voltage; an insulating converter transformer for transferring a primary-side output to a secondary side; switching means for intermittently passing on the direct-current input voltage to a primary winding of the insulating converter transformer; a primary-side resonance circuit for actuating the switching means in a voltage resonance mode; power-factor improvement means for improving a power factor by generating intermittently a rectified current based on the fed-back switching output voltage; a secondary-side resonance circuit on a secondary side of the insulating converter transformer; direct-current output voltage generation means carrying out a rectification operation in order to generate a secondary-side direct-current output voltage; and constant-voltage control means for executing constant-voltage control on the secondary-side direct-current output voltage.

Switching power supply circuit

An intelligent rechargeable battery pack having a battery management system for monitoring and controlling the charging and discharging of the battery pack is described. The battery management system includes primary and secondary protection circuits for monitoring the charging and discharging of the battery. Individual battery cells forming the battery pack are connected by a main bus to a connector for connection to a battery charger or a device to be powered, and the main bus may be interrupted by a switch controlled by the battery management system to prevent damage to the battery during charging or discharging of the battery.

Battery management system for control of lithium power cells

An intelligent rechargeable battery pack having a battery management system for monitoring and controlling the charging and discharging of the battery pack is described. The battery management system includes a memory for storing data related to the operation of the battery, and the battery management system is also configured to communicate the data related to the operation of the battery to other processors for analysis.

System and method for tracking and archiving battery performance data

A carrier, such as a battery, that queries a memory of a charger or charging circuit, or the memory of equipment or discharging circuit powered by the battery, to determine the relative date or version of data, operating parameters and/or software on both the battery and the equipment, and either provides updated data, operating parameters and/or software to the equipment, or retrieves later dated data, operating parameters and/or software from the equipment to update the memory of the battery and/or further distribute the updated data, operating parameters and/or software to other batteries or equipment.

Viral distribution of battery management parameters

A power generation circuit using an electromagnetic wave which does not require any additional energy is provided. Power generation is performed by utilizing the electromagnetic wave existing in a space for living.

Power generation circuit using electromagnetic wave

This invention provides an AC-to-DC power converter that improves the overall conversion efficiency especially that at the minimum input ac voltage for universal input operation design by adopting a new combination of control strategies and topologies for the PFC pre-regulator and DC-to-DC converter. The PFC pre-regulator was arranged to provide a regulated bus voltage of which the amplitude is varied in accordance with input ac voltage by a follower boost controller to achieve best efficiency in minimum input ac voltage operation. A synchronous rectifier dual boost PFC pre-regulator was present for further reduction of the power loss in the converter. Symmetrical half-bridge or symmetrical full bridge switch devices were arranged for the primary side of DC-to-DC converter and synchronous rectification circuit with two synchronous rectifier were arranged for the secondary side of the DC-to-DC converter as combination of the AC-to-DC converter. The two synchronous rectifiers were controlled to turn on and turn off complementary to that to the primary half-bridge switch devices to insure a minimized power loss of that converter stage for the extended bus voltage operation design.

High efficiency power converter with synchronous rectification

A cost effective circuit improves the cross regulation of multiple outputs converter, especially for that output chokes are coupled and a synchronous rectifier is applied to one of the outputs. A DC/DC converter includes a transformer having a primary winding and two secondary windings. The first secondary winding is coupled to a synchronous rectifier and a first output choke. The second secondary winding is coupled to a diode rectifier and a second output choke. The first output choke and the second output choke are coupled. A low power MOSFET switch is added to the diode rectifier for avoiding the diode rectifier operating in DCM when light loaded.

Multiple output converter with improved cross regulation

A cost effective circuit improves the cross regulation of multiple outputs converter, especially for that output chokes are coupled and a synchronous rectifier is applied to one of the outputs. A DC/DC converter includes a transformer having a primary winding and two secondary windings. The first secondary winding is coupled to a synchronous rectifier and a first output choke. The second secondarywinding is coupled to a diode rectifier and a second output choke. The first output choke and the second output choke are coupled. A low power MOSFET switch is added to the diode rectifier for avoiding the diode rectifier operating in DCM when light loaded.

Sen Dou

Papers

High efficiency power converter with synchronous rectification

Multiple output converter with improved cross regulation

Multiple output converter with improved cross regulation and its method