Industrial Technology Research Institute

Che-Min Kung

Ching-Ran Lee

Jung-Min Hwang

Wen-Tien Tsai

Chi-Chun Huang

Yu-Jen Chen

Shi-Wei Huang

Tse-Hsu Wu

Wei-Ming Chen

Shun-Yi Yang

A linear driving module includes: a control circuit, a dimming module, and a low-dropout regulator. The control circuit generates switch signals in response to a change in a pulsed DC voltage. The dimming module receives the pulsed DC voltage. The dimming module includes dimming units. Light-emitting diode units in the dimming units are in a light-on state or a light-off state. The low-dropout regulator receives an input voltage from the dimming unit, and converts the input voltage into a regulated voltage. The input voltage varies with the number of light-emitting diode units in the light-on state. The input voltage is lower than the pulsed DC voltage, and the regulated voltage is lower than the input voltage.

Linear driving module

In driving a segmented LED loading, an alternating current (AC) voltage is rectified into a direct current (DC) voltage; the DC voltage is regulated into an input voltage and the input voltage is maintained higher than a lowest voltage used for lighting at least one LED segment of the segmented LED loading; the input voltage and a current flowing through the segmented LED loading is detected to generate a switch control signal and a current control signal; respective operation states of each of a plurality of switches of a LED segment switch module are controlled by the switch control signal to control each LED segment of the segmented LED loading as power-supply state or no-power-supply state; and the current of the segmented LED loading is regulated based on the current control signal.

LED driving circuit and method

A dimming control method and circuit thereof are provided. After receiving a TRIAC signal with at least one positive/negative half cycle waveforms, the turning points of the positive/negative half cycles are detected to obtain the conduction angles of the positive/negative half cycle waveforms. Then, a pulse width modulated signal with the symmetrical positive and negative half cycle waveforms is rebuilt to control a lamp. Therefore, the disclosure can solve the flickering issue of the lamp.

Dimming control method and circuit thereof

The present disclosure relates to a switch circuit. The switch circuit comprises: a plurality of storing elements and a plurality of switch elements. The plurality of switch elements coupled the plurality of storing elements for generating a step-down mode. Moreover, the switch elements, controllers and parts of resistors in the present disclosure are integrated in an integrated circuit so as to effectively reduce size and weight of the driving circuit, advance the circuit suitability, and decrease the development cost of the circuit.

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Hsinchu, Taiwan

Che-Min Kung