Abstract: A motor controller having a pulse width modulation generating mechanism is provided. A triangular wave signal generator circuit generates a triangular wave signal. A comparator compares the triangular wave signal with an input control signal to determine a pulse width modulation signal. A signal detector circuit detects a duty cycle of each of a plurality of pulse waves of the pulse width modulation signal. A control converter circuit converts the duty cycle of each of the plurality of pulse waves of the pulse width modulation signal as an arithmetic value into a control value, according to a preset ratio. A driver circuit drives a motor to rotate according to the control value from the control converter circuit.

Abstract: A motor driver having a motor abnormality detection mechanism is provided. A motor position detecting circuit detects a change in a state of a rotor of the motor switching between a plurality of magnetic pole positions to output a commutation signal. An abnormality determining circuit, according the commutation signal, determines a plurality of time intervals during which the rotor of the motor is switched to the plurality of magnetic pole positions respectively to output an abnormality detected signal. A rotational protection controller circuit outputs a rotation protecting signal to a motor driving circuit according to the abnormality detected signal. A motor driving circuit drives the motor according to the rotation protecting signal. When the abnormality detected signal received by the rotational protection controller circuit indicates that the motor abnormally rotates, the rotational protection controller circuit adjusts the rotation protecting signal outputted to the motor driving circuit.

Abstract: A power converter having a multi-stage high-side driving mechanism is provided. A control circuit outputs a first high-side control signal. A high-side driving circuit, according to the first high-side control signal and a first input voltage signal, outputs a first stage high-side driving signal to a control terminal of a high-side switch. As a result, a voltage of the control terminal of the high-side switch is pulled up to a first stage voltage from zero. Then, the control circuit outputs a second high-side control signal. A charge pump outputs a charging signal. The high-side driving circuit, according to the second high-side control signal and the charging signal, outputs a second stage high-side driving signal to the control terminal of the high-side switch. As a result, the voltage of the control terminal of the high-side switch is pulled up from the first stage voltage to a target voltage.

Abstract: A power converter having a multi-slope compensation mechanism is provided. A multi-slope compensation circuit of the power converter includes a plurality of first capacitors, a comparator and a plurality of first resistors. A first terminal of each of the plurality of first capacitors and a node between a second terminal of a high-side switch and a first terminal of a low-side switch are connected to an inductor. A plurality of first input terminals of a comparator are respectively connected to second terminals of the plurality of first capacitors, and are respectively connected to first terminals of the plurality of first resistors. Second terminals of the plurality of first resistors are coupled to a second reference voltage. A second input terminal of the comparator is coupled to a first reference voltage. An output terminal of the comparator is connected to an input terminal of a driver circuit.

Abstract: A motor driver using a motor magnetic pole reference controlling mechanism is provided. A motor position detecting circuit detects a rotor of a motor to determine a plurality of magnetic pole positions to which the rotor of the motor is switched respectively during a plurality of time intervals. A reference magnetic pole switching circuit selects one of the plurality of time intervals according to a change in rotational speed of the motor over time. The reference magnetic pole switching circuit uses the magnetic pole position to which the rotor of the motor is switched during the one of the plurality of time intervals as magnetic pole reference data. A motor driving circuit drives the motor according to the magnetic pole reference data from the reference magnetic pole switching circuit.

Abstract: A piezoelectric valve driver device is provided. A first driver is connected to a first side of a valve. A second driver is connected to a second side of the valve. A power charging circuit is coupled between an external power source and a second voltage. A charging and discharging current controller is connected to the first driver, the second driver and the power charging circuit, and is configured to control currents of the first driver, the second driver and the power charging circuit. When a driver circuit switches the valve from a closed state to an open state, the first driver provides a first voltage to the first side of the valve, and the second voltage that is outputted to the second side of the valve by the second driver is discharged to output a discharging current to the external power source through the power charging circuit.

Abstract: A motor forward and reverse rotation detector and a motor driver having the motor forward and reverse rotation detector are provided. A rotor position detecting circuit detects a position of a rotor of a motor to output a commutation signal. A forward and reverse rotation detecting circuit detects a back electromotive force of the motor to output a back electromotive force detected signal. The forward and reverse rotation detecting circuit, according to a phase relationship and a phase difference between the back electromotive force detected signal and the commutation signal, determines which one of a forward direction and a reverse direction is a rotational direction of the motor to output a rotational direction detected signal. A motor driving circuit drives the motor according to the rotational direction detected signal.

Abstract: A motor driver, a control method of the motor driver, and a motor driving system are provided. The motor driver includes a rotation information pin, an analog detecting circuit and a mode switching circuit. The rotation information pin is configured to receive a reference signal. The analog detecting circuit and the mode switching circuit are respectively and electrically connected to the rotation information pin and the analog detecting circuit. The analog detecting circuit determines whether the reference signal is an analog signal, and the motor driver is maintained in a master mode when the reference signal does not belong to the analog signal. The mode switching circuit determines whether the reference signal is a noise when the reference signal is the analog signal. The mode switching circuit switches the motor driver from the master mode to a slave mode when the reference signal is not the noise.

Abstract: An optical sensor having a common light sensing circuit for synchronously sensing a plurality of color light signals is provided. A plurality of photoelectric components respectively convert the plurality of color light signals into a plurality of photocurrents. A plurality of gain amplifiers respectively multiply the plurality of photocurrents by a plurality of gains to output a plurality of amplified photocurrents. An arithmetic circuit adds up the plurality of amplified photocurrents to output a total amplified photocurrent signal. A common analog-to-digital converter converts the total amplified photocurrent signal into a digital signal. A counter circuit counts bit values of the digital signal to output a counting signal.

Abstract: A power converter device is provided. A feedback circuit outputs a comparison output signal. A phase-locked loop circuit provides a phase-locked signal according to a reference clock signal and an inductor voltage in a power converter circuit. An on-time circuit provides an on-time comparing signal according to the phase-locked signal, an input voltage, the inductor voltage and an output voltage of the power converter circuit. A first input terminal of an SR flip-flop receives the on-time comparing signal from the on-time circuit. A second input terminal of the SR flip-flop receives the comparison output signal from the feedback circuit. A frequency control circuit, according to changes in the input voltage and the output voltage of the power converter circuit, instantaneously adjusts the on-time of the on-time signal such that an output terminal of the SR flip-flop outputs the adjusted on-time signal to the power converter circuit.

Abstract: A motor driver having a high success rate starting mechanism is provided. A multi-segment slope pattern circuit connects a plurality of values of waveforms of a starting waveform signal to form a curve. The multi-segment slope pattern circuit determines a plurality of slopes respectively of a plurality of curve segments included in the curve according to a plurality of parameters related to a motor. The multi-segment slope pattern circuit outputs a multi-segment slope pattern signal according to the plurality of slopes of the plurality of curve segments. A startup signal generating circuit outputs a first startup waveform signal according to the multi-segment slope pattern signal. A motor controller circuit controls a motor driving circuit to start up the motor according to the first startup waveform signal.

Abstract: A motor driver using a correcting mechanism on a sensed motor position is provided. A rotor position detector circuit senses a position of a rotor of a motor to output a commutation signal. A back electromotive force detector circuit detects a back electromotive force signal of the motor. An actual phase difference calculator circuit calculates a phase difference between the back electromotive force signal and the commutation signal as an actual phase difference. An error phase angle calculator circuit calculates a difference between the actual phase difference and a reference phase difference as an error phase angle. A motor driving circuit corrects the commutation signal according to the error phase angle. The motor driving circuit determines the position of the rotor of the motor to drive the motor according to the corrected commutation signal.

Abstract: A method of stabilizing data of digital signals is provided. The method includes steps of: setting a boundary coefficient; reading a piece of digital data; defining a value of the piece of digital data as a center value; outputting the value of the piece of digital data; reading a next piece of digital data; subtracting a value of the next piece of digital data from the previously outputted value to obtain a positive difference or a negative difference; and determining whether or not an absolute value of the positive or negative difference is larger than the boundary coefficient, if not, outputting the center value, if yes, updating the center value such that the updated center value is equal to the value of the next piece of digital data, and outputting the updated center value.

Abstract: A foreign object detecting system and a method are provided. A control circuit controls a light transmitter and a light receiver. The light transmitter is disposed adjacent to a detected object and emits a light signal toward the detected object. The light receiver is disposed adjacent to the detected object in a path along which the light signal reflected by the detected object travels. The light receiver receives the light signal reflected to the light receiver. In a pre-operation, the control circuit defines the light signal received by the light receiver when the foreign object is not on the detected object as a first reflected light signal. In a detection operation, the control circuit determines that a difference exists between the light signal currently received by the light receiver and the first reflected light signal, the control circuit determines that the foreign object is on the detected object.

Abstract: A motor driver having a startup adjusting mechanism is provided. A steady-state detector circuit detects data for driving a motor to stably rotate to output a steady-state detected signal. A startup waveform pattern circuit selects one of a plurality of startup waveform patterns to output a startup waveform pattern signal according to the steady-state detected signal. A startup waveform generator circuit outputs a startup waveform signal according to the startup waveform pattern signal. A motor controlling circuit controls a motor driving circuit to start up the motor according to the startup waveform signal.

Abstract: A micro electro-mechanical film speaker device is provided. A signal input terminal of a signal amplifier circuit is connected to an external input circuit. A second output terminal of the signal amplifier circuit is connected to a negative terminal of a micro electro-mechanical film speaker. A first terminal of a first high-pass filter is connected to a first output terminal of the signal amplifier circuit. A second terminal of the first high-pass filter is connected to a positive terminal of the micro electro-mechanical film speaker. A first terminal of a second high-pass filter is connected to a feedback terminal of the signal amplifier circuit. A second terminal of the second high-pass filter is connected to the positive terminal of the micro electro-mechanical film speaker.

Abstract: A light sensor having a voltage reversing mechanism is provided. A photoelectric component converts a first light signal into a first photocurrent. A capacitor is charged to a first voltage by the first photocurrent. A counter counts a first coarse count value according to the first voltage. The photoelectric component converts a second light signal into a second photocurrent. The capacitor is charged from a reversed first voltage to a second voltage by the second photocurrent. The counter counts a second coarse count value according to the second voltage. The counter counts a fine count value according to the second coarse count value. One of the first light signal and the second light signal is emitted by both of an ambient light source and a light-emitting component and then reflected by a tested object, and the other one of them is emitted by only the ambient light source.

Abstract: A motor controlling circuit is provided. A first terminal of a first high-side transistor and a first terminal of a second high-side transistor are coupled to a common voltage. A first terminal of a first low-side transistor is connected to a second terminal of the first high-side transistor. A first node between the first terminal of the first low-side transistor and the second terminal of the first high-side transistor is connected to a first terminal of a motor. A first terminal of a second low-side transistor is connected to a second terminal of the second high-side transistor. A second node between the first terminal of the second low-side transistor and the second terminal of the second high-side transistor is connected to a second terminal of the motor. The driver circuit regulates at least one of the transistors such that no current flows to the common voltage.

Abstract: A power converter having a smooth transition control mechanism is provided. An oscillator circuit outputs a clock signal. A control circuit receives the clock signal from the oscillator circuit and outputs a control signal based on the clock signal. A driver circuit outputs a high-side conduction signal and a low-side conduction signal according to the control signal. A high-side switch is turned on or off according to the high-side conduction signal from the driver circuit. A low-side switch is turned on or off according to the low-side conduction signal from the driver circuit. The oscillator circuit receives the high-side conduction signal from the driver circuit. The oscillator circuit, according to the high-side conduction signal, determines whether or not the clock signal outputted to the control circuit needs to be adjusted.

Abstract: An automatic control system for a phase angle of a motor is provided. A current detector circuit detects a current signal of the motor to output a current detected signal. A control circuit outputs a control signal according to the current detected signal indicating a time point at which the current signal reaches a zero value. A driver circuit outputs a driving signal according to the control signal. An output circuit operates to output a motor rotation adjusting signal to the motor to adjust a rotational state of the motor according to the driving signal.