Singapore Institute of Standards and Industrial Research

Singapore Productivity and Standards Board

Che Lock Chia

Kia Tong Tan

Xiaming Zeng

Xiaoming Zeng

An electronic ballast circuit for igniting, supplying and dimming a gas discharge lamp which comprises an oscillation control circuit, an IR2155 self-oscillating half-bridge driver, a dimming control circuit, a load circuit including at least one gas discharge lamp and an over-current protection circuit, wherein the oscillation control circuit controls a current through the lamp by pulse width modulation of a drive signal during a pre-heating stage and the normal operation to control the dimming of the gas discharge lamp.

Electronic ballast circuit for igniting, supplying and dimming a gas

A DC-AC converter for igniting and supplying a gas discharge lamp comprises a converter control circuit including a starter circuit containing first, second and third switching elements; a load circuit including at least one gas discharge lamp; and an igniting circuit including a fourth switching element, wherein the converter control circuit controls a current through the lamp via a current sensor resistor during a pre-heating stage; the igniting circuit disenables the third switching element and thereby isolates the converter control circuit during an igniting stage; and the converter control circuit controls the current through the lamp via the current sensor resistor during normal operation.

Growing community of inventors

Singapore, Singapore

Che Lock Chia