Anpec Electronics Corporation

Kun-Min Chen

Ching-Sheng Li

Ming-Jung Tsai

Ching-Shan Lu

Chia-Tai Yang

Shen-Min Lo

Yi-Cheng Liu

I-Lin Chiu

Ching-Feng Lai

Shiue-Shr Jiang

Che-Ming Hsu

Shih-Hai Chien

Chien-Lun Chu

Ke-Tsung Chen

Sung-Ming Lai

Tzu-Cheng Teng

Chien-Sheng Wang

Li-Wei Chen

Jyun-Ping Jiang

Yin-Kai Chen

Ke-Min Chen

Chen-Yu Yuan

Chung-Hsien Fu

Huan-Chieh Chou

Chien-Cheng Chen

Ying-Chen Lin

A power converter having a charge pump frequency switching control mechanism is provided. In the power converter, frequencies of a plurality of pulse waves of a clock signal are determined, according to a level of a high-side control signal outputted to a control terminal of a high-side switch from a control circuit or a voltage of the control terminal (and a voltage of a second terminal) of the high-side switch. In the power converter, a charge pump supplies power to a high-side driver circuit at the frequencies of the clock signal, and the high-side driver circuit uses the power from the charge pump to drive the high-side switch and to pull up the voltage of the control terminal of the high-side switch.

Power converter having charge pump frequency switching control mechanism

A motor driver circuit having a reverse current detection mechanism is provided. The motor driver circuit includes a reverse current detector circuit, a control circuit, a driver circuit and an output stage circuit. The reverse current detector circuit detects a current flowing through a motor within a preset time interval to output a current detected signal. The control circuit determines whether or not the detected current is a reverse current to output a control signal according to the current detected signal. The driver circuit outputs a driving signal according to the control signal. The output stage circuit operates to output an output-stage signal to the motor according to the driving signal. The motor rotates according to the output-stage signal.

Motor driver circuit having reverse current detection mechanism

A motor driver having a temperature sensing mechanism is provided. A control circuit determines a time for outputting a controlling signal according to a pulse-width modulation signal received from an external pulse-width modulation circuit. A driving circuit outputs a driving signal according to the controlling signal. An output stage circuit operates according to the driving signal to output an output stage signal to a motor to drive the motor to rotate. In a temperature sensing mode, a thermal sensor circuit senses a temperature inside the motor driver to output a temperature sensing signal. An external system circuit determines whether or not the motor driver causes overheating to the motor when being adapted to the motor according to the temperature sensing signal, and evaluates whether or not the motor driver is applicable to the motor.

Motor driver having temperature sensing mechanism

A motor driver of setting pulse width modulation at commutation time points of a motor is provided. A commutation control circuit outputs a phase control signal and a commutation starting signal according to a preset phase angle and a commutation signal of the motor. A pulse width modulation calculating circuit determines a starting time point of each of a plurality of cycles of a pulse width modulation signal according to the commutation starting signal. The pulse width modulation calculating circuit determines time of each of the plurality of cycles of the pulse width modulation signal according to the phase control signal. The pulse width modulation calculating circuit determines widths of a plurality of pulse waves of the pulse width modulation signal according to a target rotational speed of the motor. A motor driver circuit drives the motor according to the pulse width modulation signal.

Motor driver capable of setting pulse width modulation at commutation time points of motor

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.

Converter having multi-stage high-side driving mechanism

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.

Motor forward and reverse rotation detector and motor driver having motor forward and reverse rotation detector

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.

Motor driver and control method thereof and motor driving system

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.

Motor driver using correcting mechanism on sensed motor position

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.

Motor controlling circuit

A motor current protecting circuit is provided. A voltage calculating circuit determines whether or not each of low-side switches is fully turned on and then determines whether or not a voltage difference between a first terminal and a second terminal of each of the low-side switches being fully turned on is larger than or equal to a zero value. The voltage calculating circuit adds up the voltage differences each of which is larger than or equal to the zero value to output a voltage signal. A control circuit controls a driver circuit to switch the low-side switches and high-side switches according to the voltage signal.

Motor current protecting circuit

A rotation locking system of a motor of a fan is provided. A closed-loop control circuit outputs an initial duty cycle signal according to a current rotational speed and a target rotational speed. A driver circuit outputs a driving signal to the motor to drive the motor to rotate according to the initial duty cycle signal. A lookup table arithmetic circuit looks up, from a lookup table, two reference duty cycles correspond to two reference rotational speeds that are respectively equal to the current rotational speed and the target rotational speed. The lookup table arithmetic circuit calculates a difference between the two reference duty cycles. A speed feedback control circuit compensates the initial duty cycle signal according to the difference to output a final duty cycle signal to the driver circuit. The driver circuit drives the motor to rotate according to the final duty cycle signal.

Rotation locking system of motor of fan

A motor current controlling circuit having a voltage detection mechanism is provided. A first terminal of a first low-side transistor is connected to a second terminal of a first high-side transistor. A 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 a second high-side transistor. A zero current detector circuit detects a voltage of the node and determines whether or not a current flowing through the motor is equal to a zero value to output a zero current detected signal according to the detected voltage. A controller circuit controls a driver circuit to turn on or off the high-side transistors and the low-side transistors according to the zero current detected signal.

Motor current controlling circuit having voltage detection mechanism

A motor protecting circuit is provided. A first terminal of each of high-side transistors is coupled to a power supply voltage. A second terminal of each of low-side transistors is grounded. Second terminals of the high-side transistors are respectively connected to first terminals of the low-side transistors. An overvoltage detector circuit is coupled to the power supply voltage of an output circuit. When the overvoltage detector circuit determines that the power supply voltage of the output circuit is higher than a voltage threshold, the overvoltage detector circuit outputs an overvoltage detected signal to a controller circuit. According to the overvoltage detected signal, the controller circuit controls a driver circuit to turn on at least one of the high-side transistors and at least one of the low-side transistors at the same time.

Motor protecting circuit

A three-phase motor driving circuit and a three-phase motor driving method are provided. The three-phase motor driving circuit includes an inverter circuit, a control circuit, a turn-off module, a turn-off confirmation module, and a turn-on logic unit. The inverter circuit includes a plurality of phase circuits, each including an upper bridge switch and a lower bridge switch. The control circuit operates in a feedback mode to output a feedback start signal. The turn-off module includes a feedback detection unit, a voltage adjusting unit, and a turn-off logic unit. The feedback detection unit detects an output current of a designated phase circuit, and if the output current flows out, a voltage regulation signal is output until the output current is 0, and a lower bridge turn-off signal is output. The voltage adjusting unit adjusts the voltage of the output node to be close to a predetermined voltage.

Three-phase motor driving circuit and three-phase motor driving method

A motor driving circuit and a motor driving method are provided. The motor driving circuit is used to drive the motor and includes an inverter circuit, a control circuit, a current-limiting circuit, a start circuit and a transient circuit. The control circuit controls the inverter circuit to drive the motor with a motor control current according to a set current limit value indicated by a current-limiting signal, and outputs a steady state ready signal in response to the motor reaching a steady state. The current-limiting circuit generates the current-limiting signal according to a start state signal, or generates the current-limiting signal according to a transient signal. The start circuit outputs the start state signal when the motor starts. The transient circuit detects whether the motor is in a transient state, and outputs the transient signal in response to the motor being in a transient state.

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Hsinchu, Taiwan

Kun-Min Chen