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| Application No. | Application Title | Issue Date |
| 20120007526 | Rotation Speed Control Circuit, Rotation Speed Control Method and Fan System A rotation speed control circuit for controlling a rotation speed of a fan includes: a rotation speed detector, for generating a rotation speed voltage according to a rotation speed signal corresponding to the rotation speed; a sample and hold element, coupled to the ro... | 01/12/2012 |
| 20110062910 | Method of Driving DC Motor and Related Circuit for Avoiding Reverse Current A motor driving method for driving a direct-current (DC) motor, designed for avoiding a reverse current induced by the Back Electromotive Force (BEMF), includes providing a driver circuit for driving the DC motor; comparing a signal level of a terminal of the DC motor a... | 03/17/2011 |
| 20100253259 | Driving Method and Related Driving Device for a Motor A driving method for a motor includes sensing variation of magnetic pole of a rotator of the motor, to generate a magnetic pole sensing signal, determining dead zone of the motor according to the magnetic pole sensing signal, to generate a determination result, and adju... | 10/07/2010 |
| 20100244757 | Current Limit Control Method of DC Motor and Related Device and Circuit A control method of a current limit of a DC motor includes generating a reference voltage according to a preset current limit value of a DC motor; comparing the reference voltage with the voltage drop of a power control switch which drives the DC motor to generate a com... | 09/30/2010 |
| 20100176851 | Pulse Width Modulation Circuit Capable of Linearly Adjusting Duty Cycle with Voltage and Related Method A pulse width modulation circuit capable of linearly adjusting duty cycle with voltage, which comprises an input voltage source for generating an input voltage, a regulator for generating a regulated voltage, a first voltage-dividing unit for providing a first divided v... | 07/15/2010 |
| 20100090631 | Sensorless Method and Related Device for Starting a Three-phase Brushless Direct-current Motor A sensorless method for starting a three-phase brushless direct-current motor includes generating a start-up control signal, a start mode selection signal, and a control signal commutation period; switching to a start mode according to the start mode selection signal; i... | 04/15/2010 |
| 20100054964 | Rotating Speed Adjustment Circuit and Related Control System for a Heat Dissipation Fan A rotating speed adjustment circuit for a heat dissipation fan includes a first node, a second node, a reception end for receiving a first control signal, a first resistor coupled to a voltage source and the first node, a second resistor coupled to the first node and th... | 03/04/2010 |
| 20100052591 | MOTOR DRIVING CIRCUIT FOR ADJUSTING SPEED OF A MOTOR BY CHANGING AN OUTPUT VOLTAGE A motor driving circuit for adjusting speed of the motor by changing output voltage is disclosed. One end of the motor is coupled to a variable voltage source. The motor driving circuit includes a motor-driving unit, a control unit and a determining unit. The motor-driv... | 03/04/2010 |
| 20100045357 | Clamp Circuit for Clamping Inrush Voltage Induced by Hot Plugging and Related Chip An inrush voltage clamping circuit for an electronic device for clamping an inrush voltage induced by hot plugging is disclosed. The clamp circuit includes a buffer unit and a clamp unit. The buffer unit is coupled to an input power end for receiving an inrush current o... | 02/25/2010 |
| 20080252245 | Motor Driving Circuit Having Low Current Consumption under a Standby Mode A power cutter, an oscillator, a counter, a S-R latch, and a Hall bias are further disposed inside a DC motor driving circuit so that current consumption of the DC motor driving circuit is reduced significantly under a standby mode. When the counter detects that a recei... | 10/16/2008 |
| 20070297205 | Driving Circuit for Switching DC Power A driving circuit for switching DC power includes a DC power generator, a bridge circuit, a control signal generator, and a clamping module. The bridge circuit includes a plurality of legs each including an up-bridge switch and a down-bridge switch. The clamping circuit... | 12/27/2007 |
| 20070285038 | Full Bridge Circuit and DC Motor Capable of Fixing Output Voltage and Avoiding Reverse Current A full bridge circuit includes a first switch, a second switch, a third switch, a fourth switch, a first controller, a second controller, a first operational amplifier, a first multiplexer, a second operational amplifier, and a second multiplexer. The first controller i... | 12/13/2007 |
| 20070221997 | Driving Circuit to Avoid Reverse Current for Soft Switching DC Motor A driving circuit includes a power supply, an input capacitor, a Hall sensor, a first amplifier, a second amplifier, a full-bridge driver circuit, and a first operational amplifier. The input capacitor is coupled to the power supply. The input end of the first amplifier... | 09/27/2007 |
