Abstract: A synchronous power converter system is provided. The system includes a processor circuit and a plurality of power converters. The processor circuit outputs a plurality of clock signals having the same frequency. The power converters respectively receive the clock signals. Each of the power converters includes an oscillator circuit, a frequency detector circuit, a compensator circuit, a controller circuit, and a switch circuit. The oscillator circuit outputs an oscillation signal. The frequency detector circuit receives the clock signal and the oscillation signal and detects a clock frequency of the clock signal and an oscillation frequency of the oscillation signal to output a frequency detected signal. The compensator circuit outputs a compensating signal according to the frequency detected signal. The controller circuit controls the switch circuit according to the compensating signal.

Abstract: A light sensor with high linearity is provided. A photoelectric component converts light energy into a photocurrent to a first capacitor. An error amplifier has a first amplification input terminal and a second amplification input terminal, which are respectively connected to a reference voltage source and a first terminal of a first transistor. A first terminal of a second transistor is connected to the second amplification input terminal. A second terminal of the first transistor is connected to the first capacitor. An output terminal of the error amplifier is connected to a second terminal of the second transistor. A first comparator compares a voltage of the first capacitor with a lowest one of a modulated voltage and a reference voltage to generate a first comparing signal. A counter circuit performs counting according to the first comparing signal.

Abstract: A motor driving device having a lock protection mode includes a rotation speed detecting unit, an operating unit, a driving unit, a floating point selecting unit, a BEMF detecting unit, a control unit, and a lock protection unit. The operating unit enters an operating mode after a motor is stably operated, and generates an operating signal having phases according to a commutation sequence, and the driving unit drives the motor. The BEMF detecting unit detects a BEMF of a first floating phase to generate a detection result. The control unit outputs a commutation signal to cause the driving unit to drive the motor. When the rotation speed detecting unit determines that a rotation speed of the motor exceeds a predetermined rotation speed, the rotation speed detecting unit outputs a switching signal to the lock protection unit to enter the lock protection mode.

Abstract: A motor driving device includes a first hysteresis comparator, a second hysteresis comparator, a logic circuit, a control unit, and an inverter circuit. The logic circuit receives a start signal or a start completion signal to output the first output signal as a commutation signal according to the start signal, or to output the second output signal as the commutation signal according to the start completion signal, clamps the second output signal by the first output signal, stops outputting the commutation signal after the potential state of the commutation signal is changed, and unclamps the second output signal with the first output signal and outputs the commutation signal in response to a difference voltage between the first input signal and the second input signal being greater than a positive value of the first hysteresis voltage or less than a negative value of the first hysteresis voltage.

Abstract: A charger having a fast transient response and a control method thereof are provided, which decide how to quickly respond to a requirement of a load by determining whether an input current reference signal indicating an input current is larger than or equal to a maximum safe current of a transformer. Therefore, the charger and the control method realize the fast transient response without having to control switching between a boost circuit and a buck circuit. Meanwhile, the charger and the control method thereof can be prevented from being damaged by an excessive input current and can stabilize an output voltage of the load more quickly.

Abstract: A rapid sensing value estimation circuit and a method thereof are provided. The rapid sensing value estimation circuit includes a first sensing unit, an integration sensing circuit and a rapid estimation circuit. The rapid estimation circuit includes a clock generator, a second counter, a first digital comparator, and an arithmetic module. The clock generator generates a clock signal. The second counter counts the clock signal to generate a second count value. The first digital comparator determines whether the second count value exceeds a first predetermined count value when the first count value increases. The arithmetic module estimates the first count value at an end of an integration time according to a ratio of the second maximum count value to the second count value and the first count value when the second count value exceeding the first predetermined count value, to generate an estimated count value result.

Abstract: A dynamical time gain controlling light sensing device generates a detection time configuration signal according to a light intensity indication signal, and generates a set of adjustment switch signals to respectively control the plurality of gain selection switches to be turned on or off according to a ratio of a real gain time and a simulation gain time within a detection time, such that an overall gain of a resolution adjustment circuit can correspond to an substitute gain lower than a set gain within the simulation gain time and correspond to the set gain within the real gain time, thereby generating an adjusted count result signal.

Abstract: A system and a method for driving a motor with a frequency conversion mechanism are provided. The system includes a look-up table module, an oscillator circuit, a multi-frequency signal generator circuit, and a motor driver circuit. The look-up table module stores a preset driving signal. The oscillator circuit generates oscillating signals having different frequencies. The multi-frequency signal generator circuit outputs a multi-frequency signal according to the oscillating signals. One waveform segment of the multi-frequency signal in a modulation region has a first oscillating frequency. Another waveform segment of the multi-frequency signal outside the modulation region has a second oscillating frequency lower than the first oscillating frequency. When a back electromotive force or a phase current of the motor reaches zero within a time interval of the modulation region, the motor driver circuit drives the motor according to the preset driving signal and the multi-frequency signal.

Abstract: A motor driving circuit includes a rotation speed request generator, a motor driving signal generating unit, an inverter circuit, a position detecting circuit, a current detecting module, a rotation speed signal lookup module, an automatic leading angle controller, and a modulation signal generating circuit. When the rotation speed request signal indicates that a rotation speed of a motor is adjusted to a current rotation speed, the rotation speed signal lookup module queries a lookup table and generates a leading angle indication signal for indicating a current leading angle as a adjusting angle, and the automatic leading angle controller generates a phase adjusting signal, and the modulation signal generation circuit roughly adjusts a modulation waveform with the adjusting phase. The modulation signal generating circuit performs a fine adjustment on the modulation waveforms according to a phase difference, thereby making the current zero-crossing point near the BEMF zero point.

Abstract: A proximity sensor with a sliced integration time sensing mechanism and a sensing method thereof are provided. A light transmitter emits a sensing light toward a detected object during a first phase time. A light receiver receives a first light signal formed by the sensing light reflected by the detected object and an ambient light during the first phase time, and receives a second light signal of the ambient light during a second phase time. A first brightness of the first light signal is integrated over the first phase time to form a first integrated brightness value. A second brightness of the second light signal is integrated over the second phase time to form a second integrated brightness value. The light receiver subtracts the second integrated brightness value from the first integrated brightness value to obtain a first integrated brightness correction value by phase cancellation.

Abstract: A motor driving circuit includes a plurality of pins, a Hall sensor, a Hall signal processing portion and a driving processing circuit. The test-starting pin for receiving the test-starting signal and the test signal output pin for outputting the test signal are shared with at least one pin of the plurality of pins. The Hall sensor senses the change in the magnetic field of the motor to generate a Hall signal. The Hall signal processing unit amplifies the generated Hall signal, and the driving processing circuit drives the motor based on an output signal of the Hall signal processing unit and a control signal input from one of the plurality of pins. In a test mode, the output signal is output from the test signal output pin as a test signal. In a normal mode, at least one pin is used for normal operation.

Abstract: An optical proximity sensor with a digital calibration circuit and a digital calibration method are provided. In a test mode, a test light emitted by a light transmitter is reflected by a cover of an electronic device to form a first reflected analog signal to a light receiver. A digital calibration circuit counts the first number of pulse waves of a first reflected digital signal. In a calibration mode, a light is emitted to a detected object through the cover and then is reflected by the detected object to form a second reflected analog signal to the light receiver. When the digital calibration circuit counts the number of pulse waves of a second reflected digital signal up to the first number, the digital calibration circuit clears the first number and then recounts the number of pulse waves of the second reflected digital signal to obtain the second number.

Abstract: A lighting driver for driving a light-emitting component at a high speed is provided. A control terminal of a second transistor is connected to a control terminal and a first terminal of a first transistor. Input terminals of an operational amplifier are connected to the first terminal of the first transistor and first terminals of first and second switches. Control terminals of third and fourth transistors are connected to an output terminal of the operational amplifier. Second terminals of the first switch and the fourth transistor are connected to a first terminal of the second transistor. A second terminal of the second switch and a current source are connected to a second terminal of the third transistor. A first terminal of the fourth transistor is connected to the light-emitting component. A control circuit is connected to the current source, and control terminals of the first and second switches.

Abstract: A system and a method for driving a motor to rotate at a high speed are provided. The system includes a lookup table, a command detector, a pattern selector and a motor driver. The lookup table module is configured to store a reference waveform pattern and a modulated waveform pattern. An amplitude of the modulated waveform pattern is larger than an amplitude of the reference waveform pattern. The command detector is configured to receive a rotating speed command. The pattern selector is configured to receive the reference waveform pattern and the modulated waveform pattern, and select the reference waveform pattern or the modulated waveform pattern according to the rotating speed command. The motor driver is configured to output a driving signal to drive the motor according to the selected reference waveform pattern or modulated waveform pattern.

Abstract: A system and a method of driving a motor are provided. A zero crossing reference module defines a zero-crossing region based on a current zero-crossing point of a coil of the motor, and a mode switching setting module sets a reference parameter of a back electromotive force when the motor rotates at a preset rotating speed. When the current zero-crossing point fails to fall in the zero-crossing region, a driving mode selector module selects a voltage detection mode. When a parameter of the back electromotive force is equal to the reference parameter, the driving mode selector module selects to switch back to a current detection mode. A motor driving controller module calculates a position of a rotor of the motor based on the current in the current detection mode and determines the position based on the back electromotive force in the voltage detection mode to drive the motor.

Abstract: A power converter having fast transient response is provided. The power converter includes a voltage detector circuit and a compensator circuit. The voltage detector circuit includes a plurality of resistors, a plurality of comparators, and a detection control circuit. The resistors are connected in series with each other and grounded. First and second terminals of one of the resistors are respectively connected to a reference voltage and a first terminal of the adjacent resistor. First and second terminals of another of the resistors are respectively connected to a second terminal of the adjacent resistor and grounded. First input terminals of the comparators are respectively connected to second terminals of the resistors. The detection control circuit outputs control signals according to comparison signals. The compensator circuit outputs a compensating signal according to the control signals. A main control circuit controls switch circuits according to the compensating signal.

Abstract: A motor starting device includes a starting unit, a driving unit, a floating point selecting unit, a back electromotive force (BEMF) detecting unit and a control unit. In a starting mode, the starting unit generates an initial starting signal having a plurality of phases according to a commutation sequence, the driving unit drives the motor with a first phase in the initial starting signal, the floating point selecting unit selects a floating phase of the motor that is not turned on according to the driving condition of the driving unit, the BEMF detecting unit detects whether the BEMF of the floating phase has a first voltage level or a second voltage level to generate a detection result, and the control unit outputs a phase changing signal to the driving unit according to the detection result.

Abstract: A motor driving circuit for driving a motor is provided. The motor driving circuit includes a plurality of inverter circuits, a driving signal look-up table module, a driving signal generating unit, a duty cycle command detector, and a protection control circuit. The driving signal look-up table module performs a table lookup on an input driving signal to generate a driving waveform pattern signal while outputting a positive period indication signal. The duty cycle command detector generates a first protection start signal when a duty cycle corresponding to the input driving signal changes by more than a predetermined amount of change. The protection control circuit outputs a forced disable signal in a positive period interval in response to receiving the first protection start signal to control the lower bridge switch of one phase of the inverter circuits to be turned off.

Abstract: A motor driving device includes a PWM signal generating unit, a control unit, a driving unit, a floating point selecting unit and a BEMF detecting unit. The PWM signal generating unit generates an input PWM signal having a duty cycle according to a rotation speed command. The control unit generates a driving signal having multiple phases and an output PWM signal. The floating point selection unit selects a floating phase of the motor that is not turned off, and the BEMF detecting unit receives detects the BEMF of the floating phase during ON times or OFF times of the output PWM signal, so as to output a commutation signal in response to zero crossing events occurring in the BEMF. The control unit controls the BEMF detecting unit to detect the BEMF of the floating phase under the ON times or the OFF times of the output PWM signal.

Abstract: A system and a method of demodulating a frequency shift keying signal are provided. The method includes steps of: inputting the frequency shift keying signal; accumulating cycles of the frequency shift keying signal to a reference cycle number from a time point; finding an initial point of each of pulse waves of the frequency shift keying signal; accumulating the cycles to the reference cycle number multiple times from the initial point and extracting data of each accumulation; determining whether or not the number of times of extracting the data reaches a preset value, if not, returning to the previous step, if yes, performing the next step; determining whether or not a difference between the data is larger than a threshold, if not, outputting a first bit value, if yes, outputting a second bit value; and packing the first and second bit values into a demodulated signal.