Richtek Technology Corporation

Princeton Technology Corporation

I-Chi Lin

Chang-Yi Lin

Ta-Yung Yang

Ming-Chung Li

Ming-Cheng Chen

Yi-Fan Shih

A method for predicting failure of a cooling fan includes driving a motor of the cooling fan based on a control speed, generating a first speed according to an average speed of the motor, generating a first current according to an average current of the motor, retrieving a system coefficient from a memory, generating a current threshold according to the first speed and the system coefficient, and triggering an alarm signal if the first current exceeds the current threshold by a threshold amount.

Method and system for failure predication of cooling fan

A BLDC motor driver circuit includes: a driving power stage circuit configured to provide a start-up test signal in a start-up mode to excite a BLDC motor, to drive a rotor of the BLDC motor to rotate for a test; a current unidirectional circuit coupled to the BLDC motor at a reverse end for detecting a BEMF, to generate a detection signal at a forward end of the current unidirectional circuit, wherein when a voltage at the reverse end exceeds a voltage at the forward end, the current unidirectional circuit limits the voltage at the forward end not to be higher than a clamp voltage; a biasing circuit for biasing the current unidirectional circuit in a forward operation state and for providing the clamp voltage; and a sensor circuit for generating a sensing signal according to the detection signal to indicate a test rotation state of the BLDC motor.

Brushless DC electric (BLDC) motor driver circuit and start-up control method thereof

A gain controlling system, a sound playback system, and a gain controlling method thereof are disclosed. The gain controlling system includes a main gain control unit, a sub gain control unit, and a logic control unit. The main gain control unit has a first step-by-step adjusting magnitude; the sub gain control unit has a second step-by-step adjusting magnitude; wherein the second step-by-step adjusting magnitude is smaller than the first step-by-step adjusting magnitude. The logic control unit is used for controlling the main and the sub gain control unit to transform an analog signal into a converted signal according to an adjustment command signal and further determining whether an adjusting magnitude required by the adjustment command signal is larger than a maximum gain range of the sub gain control unit. If yes, the logic control unit controls the main control unit and the sub gain control unit repeatedly.

Growing community of inventors

Taipei, Taiwan

I-Chi Lin