Inventor

YU QINGHONG

US23 patents

⚠️ This page may combine multiple inventors who share the name “YU QINGHONG”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

YU QINGHONG

SCHNEIDER ELECTRIC IT CORP

Stack DC power supply battery charger

Power management unit for intelligent traffic system applications

Systems and methods for inverter and DC/DC converter operation

DC-DC power converter with four way power conversion

Systems and methods for quick power delivery mode changes

Systems and methods for controlling power devices

Flying battery with AC switch PFC front end for ups

Gain adjustment stage for controlling modular ups systems

Instantaneous line swell protection for UPS

OSRAM SYLVANIA INC

Ballast with frequency-diagnostic lamp fault protection circuit

Ballast with arc protection circuit

Ballast with ignition voltage control

Ballast with arc protection circuit

Ballast with filament heating and ignition control

Power supply for halogen lamp having an inverter and output circuit

Ballast with socket-to-fixture voltage limiting

Program start ballast

UNIVERSAL LIGHTING TECH INC

Electronic ballast with adaptive lamp preheat and ignition

Power supply circuits and methods for supplying stable power to control circuitry in an electronic ballast

Electronic ballast with open circuit voltage control and cable compensation

Electronic ballast with lossless snubber capacitor circuit

High efficiency 4-lamp instant start ballast

Lossless circuit for sampling of lamp voltage