Htc Corporation

Richtek Technology Corporation

Nan Ya Pcb Corp.

Yu-Min Chen

Leng-Nien Hsiu

Chen-Kuang Liu

Isaac Y Chen

Pei-Yuan Chen

Cheng-Te Chen

Sung-Feng Yeh

Yu-Lun Lin

Chih-Ming Lin

AN LED driving apparatus includes a power stage circuit and a dimming control circuit. The power stage circuit drives an LED circuit. The dimming control circuit includes a duty ratio conversion circuit, a digital-to analog conversion (DAC) circuit, an error amplifier (EA) circuit and a modulation control circuit. The duty ratio conversion circuit converts a PWM dimming signal to a digital duty ratio signal. The DAC circuit converts the digital duty ratio signal to an analog reference signal. The EA circuit generates an error amplified signal according to a difference between the analog reference signal and an output current related signal. The modulation control circuit generates a PWM control signal according to the error amplified signal, to control the power switch, such that the output current relates to a dimming duty ratio, whereby the dimming control circuit dims the LED circuit according to the PWM dimming signal.

Light emitting device driving apparatus and dimming control circuit and dimming control method thereof

The present invention discloses a control circuit and a control method of a light emitting device circuit. When the light emitting device circuit is normally connected in normal operation, an output current is regulated to a predetermined current. When the light emitting device circuit is removed, an output voltage is regulated to a predetermined voltage. When the light emitting device circuit is reconnected, the output current is regulated to the predetermined current. The output voltage is at or above a level when the light emitting device circuit is normally connected in normal operation, and the predetermined voltage is lower than this level.

Control circuit and control method of light emitting device circuit

A moving module and an electronic device are provided. The electronic device includes a first body, a second body, and the moving module disposed between the first and second bodies. The moving module includes a rail, a moving element, and an elastic element. The moving element is in contact with the rail. The elastic element is connected between the moving element and the first body. When the moving element moves from a first end of the rail to a curved portion of the rail, a force exerted on the elastic element by the moving element is gradually increased. When the moving element passes the curved portion, an elastic restoration force of the elastic element drives the moving element to move toward a second end of the rail. When the moving element reaches the first end or the second end, the first body and the second body interfere with each other.

Moving module and electronic device

A locking mechanism and an electronic device are provided. The electronic device includes a first body, a second body, a moving module, and a locking mechanism. The moving module is disposed between the first body and the second body, so that the second body is rotatable and tiltable relative to the first body. The locking mechanism includes a first connecting member and a plug. When the plug is coupled with the first connecting member by a magnetic force, the second body is slidable relative to the first body. When the second body is tilted up to decouple the plug from the first connecting member, the plug interferes the moving module, so that the second body is not slidable relative to the first body.

Locking mechanism and electronic device

A cutting mold for removing two opposite superfluous rigid circuit boards from a rigid-flexible circuit board. A first cutter is connected to a first moldboard. A first barricade is connected to the first moldboard. The maximum vertical distance from the first barricade to the first moldboard exceeds that from the first cutter to the first moldboard. A second moldboard is opposite the first moldboard. The first and second moldboards move with respect to each other. A second cutter is connected to the second moldboard and corresponds to the first cutter. A second barricade is connected to the second moldboard and detachably abuts the first barricade. The maximum vertical distance from the second barricade to the second moldboard exceeds that from the second cutter to the second moldboard. The first and second cutters cut the superfluous rigid circuit boards when the first and second moldboards move toward each other.

Growing community of inventors

Taoyuan, Taiwan

Yu-Min Chen