Delta Electronics, Inc.

Novatek Microelectronics Corp.

Kuan-Ting Lee

Yu-Liang Lin

Ming-Yen Lin

Cheng-Chia Hsiao

Chen-Chieh Kao

Shu-Fang Wang

Wen-Chih Wang

Wan-Ting Huang

Chia-Wen Kuo

A voltage stabilizer is provided for stabilizing a gate-source voltage of a switching element, wherein a source of the switching element receives a first driving voltage. The voltage stabilizer includes a transistor and a first resistor. A base of the transistor receives a second driving voltage, a collector of the bipolar junction transistor is electrically connected to a gate of the switching element, a first terminal of the first resistor is electrically connected to the collector and the gate, a second terminal of the first resistor is electrically connected to the source of the switching element and receives the first driving voltage.

Voltage stabilizer and power conversion device using same

An optical fingerprint recognition device includes a light-emitting diode (LED) array and a fingerprint sensing device. The LED array includes a central LED area and an edge LED area, and configured to display a light source pattern in response to a fingerprint sensing request. The light source pattern includes a central portion and a surrounding portion. During displaying the light source pattern, a plurality of red display subpixels of the central LED area are not illuminating and a plurality of red display subpixels of the edge LED area are illuminating. The fingerprint sensing device generates a first fingerprint image according to a plurality of first sensing signals obtained from a plurality of first sensing pixel area, and the first fingerprint image is adapted to be used for examining whether a finger which triggers the fingerprint sensing request is real or fake.

Optical fingerprint recognition device and fingerprint sensing device thereof

A voltage stabilizer is provided for stabilizing a gate-source voltage of a switching element, wherein a source of the switching element receives a first driving voltage. The voltage stabilizer includes a bipolar junction transistor, a first resistor and a second resistor. A base of the bipolar junction transistor receives a second driving voltage, a collector of the bipolar junction transistor is electrically connected to a gate of the switching element, a first terminal of the first resistor is electrically connected to the collector and the gate, a second terminal of the first resistor is electrically connected to the source of the switching element and receives the first driving voltage, a first terminal of the second resistor is electrically connected to an emitter of the bipolar junction transistor, and a second terminal of the second resistor receives a third driving voltage The bipolar junction transistor is operated in an active region.

A motor control system includes a voltage regulating module, an auxiliary activating module, and a drive module. The voltage regulating module is operable to receive a voltage and generate an electrical level regulated voltage by regulating the voltage. The auxiliary activating module is operable to generate a constant duty cycle signal and output the constant duty cycle signal for a period. The drive module is operable to receive the electrical level regulated voltage and the constant duty cycle signal, and control a motor based on the electrical level regulated voltage and the constant duty signal. Also, the present invention also discloses a fan which is applied to the above-mentioned motor control system.

Motor control system and fan apply thereto

A motor control device is electrically connected with a motor. The motor control device includes a controller and a driving circuit. The controller has a default value of time and generates a first driving signal and a second driving signal. The driving circuit includes a first switching element and a second switching element, the first switching element and the second switching element receive the first driving signal and the second driving signal respectively, and the first switching element and the second switching element are switched on or switched off alternately according to the first driving signal and the second driving signal respectively, so as to drive the motor to operate. The controller switches off the first switching element by the first driving signal the default value of time before the controller switches on the second switching element by the second driving signal, and the controller switches off the second switching element by the second driving signal the default value of time before the controller switches on the first switching element by the first driving signal.

Growing community of inventors

Taoyuan Hsien, Taiwan

Kuan-Ting Lee