Abstract: The present disclosure provides a dimming controller and a backlight module having the same, capable of distributing lighting times of each LED channel to a period of time. The dimming controller can decrease the duration of the LED string of each LED channel while maintaining under the duty cycle, thereby reducing the damage to the transistors. Besides, the dimming controller can turn on the transistors of the LED channels at different time points to avoid the higher current fluctuations at the output end, thereby reducing the flicker of the LED strings.

Abstract: The present disclosure provides a control circuit operating in a pulse skip mode (PSM) and a voltage converter having the same, which adaptively adjust the related values in PSM through a pulse skip circuit. More specifically, the pulse skip circuit adaptively adjusts a second comparator signal indicating a second signal (related to a feedback signal with a lower gain) and/or indirectly adjusts a first comparator signal indicating a first signal (related to a feedback signal with a higher gain) to adaptively adjust the on-time of a high-side switch and the on-time of a low-side switch during PSM, thereby reducing the output current ripple.

Abstract: The present disclosure illustrates a charge pump circuit. The charge pump circuit includes an input voltage module and a switching transistor module. The input voltage module is configured for providing an input voltage. The switching transistor module is configured for receiving a supply voltage and the input voltage. There is a voltage difference between the supply voltage and the input voltage. During a first charging period, the switching transistor module charges a first capacitor, and a voltage across the first capacitor is the voltage difference. During a second charging period, the switching transistor module charges a second capacitor, and a voltage across the second capacitor is a sum of the supply voltage and the voltage difference. A frequency which the switching transistor module charges the second capacitor is higher than a frequency which the second capacitor provides voltage to a bridge circuit.

Abstract: Disclosed are a control apparatus for dynamically adjusting a phase switching of a DC motor and a method thereof. A rotor in the DC motor is divided into 2 M pole areas, wherein M is a positive integer not less than 1. The control apparatus comprises a phase detector, a current detector, a control circuit and a driving circuit. The phase detector detects the phase switching state of the pole areas to generate a standard phase signal. The current detector detects a current flowing through the DC motor in one of switching points of the standard phase signal to generate a current detection value. The control circuit periodically outputs 2 M drive signals, and determines to perform dynamically adjusting operation on the timing sequence of the drive signals according to the current detection value. The driving circuit receives the drive signals to perform the phase switching for driving the DC motor.

Abstract: An adaptive backlight device includes a transistor, a voltage detector and an adaptive controller. The transistor is configured to control the current flowing through a light string. The transistor provides a first voltage signal and a second voltage signal. The voltage detector generates a voltage difference signal according to the first voltage signal and the second voltage signal. The adaptive controller receives the voltage difference signal from the voltage detector. The adaptive controller includes a counter. When the adaptive controller determines that the voltage difference signal is larger than or equal to a predetermined value, the adaptive controller increases the current flowing through the light string at least once via the control end of the transistor to increase the cross voltage of the light string and decrease the cross voltage of the transistor.

Abstract: A fan control system includes a control module, a first fan module and a second fan module. The control module provides a first control signal to the first fan module to adjust the rotation state of the first fan module. The first fan module provides a second control signal to the second fan module based on the first control signal to adjust the second fan module. The first fan module includes a first terminal and a second terminal. The second fan module includes a first terminal and a second terminal. The first terminal of the first fan module is electrically connected to the control module to receive the first control signal. The second terminal of the first fan module is electrically connected to the first terminal of the second fan module. The second terminal of the second fan module is electrically connected to a reference voltage.

Abstract: Disclosed are an operational amplifier and a method for reducing an offset voltage of the operational amplifier, which control an auxiliary circuit to generate a first auxiliary current and a second auxiliary current by adjusting the resistance of a resistance regulator, thereby adjusting a first current and a second current outputted from an input-stage circuit and further adjusting the offset voltage of the operational amplifier. Therefore, the operational amplifier and the method for reducing the offset voltage of the operational amplifier use the resistors to adjust the offset voltage so as to reduce the Least Significant Bit (LSB) distribution, thereby enhancing the accuracy of the offset voltage.

Abstract: The present disclosure provides a constant on-time converter having fast transient response, which adaptively adjusts an on-time and an off-time by a first compensation circuit and a second compensation circuit, to accordingly adjust an inductive current. When a load converts a light loading into a heavy loading, the constant on-time converter adaptively adjusts the on-time of the clock signal. When the load converts a heavy loading into a light loading, the constant on-time converter adaptively adjusts the off-time of the clock signal. Therefore, the output voltage can be adjusted rapidly in response to different load changes to enhance the transient response of the output voltage.

Abstract: A dual voltage output device includes a charging circuit and a control circuit. The charging circuit includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, an inductor, a first capacitor and a second capacitor. The control circuit controls the first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch so that a DC voltage source charges the inductor and the inductor charges the first capacitor and the second capacitor individually or together. Therefore, the capacitor provides a first voltage, and the second capacitor provides a second voltage.

Abstract: A current mode voltage converter having fast transient response is provided. The current mode voltage converter is used for converting an input voltage into an output voltage to drive a load. The current mode voltage converter adaptively adjusts the frequency of a clock signal by a first compensation circuit and a second compensation circuit to accordingly adjust an inductive current. Therefore, the output voltage can be adjusted rapidly in response to different load changes to enhance the transient response of the output voltage.

Abstract: An energy storage device capable of receiving energy using an energy input interface or charging an electronic device using an energy output interface. The energy storage device includes an adapter, an energy storage unit and a charger module. The adapter provides the charger module with an input current, and the charger module provides the energy storage unit with a first current. Otherwise, the charger module provides the electronic device with the input current. When the input current provided by the adapter is higher than a maximum safe current of the adapter, the energy storage unit provides the charger module with a second current. The charger module outputs energy to the electronic device according to the second current to assist the adapter to charge the electronic device. The second current is opposite to the first current.

Abstract: A heat dissipation system at lease has a first fan module including a first fan and a first fan driving circuit. The first fan driving circuit generates a fan driving signal to drive the first fan. When a control module transmits a stopping signal to the first fan module, the first fan driving circuit decreases a duty cycle of the fan driving signal driving the first fan according to the stopping signal. When the duty cycle of the fan driving signal driving the first fan is less than or equal to a first predetermined duty cycle, within a first working time, the first fan driving circuit decreases the duty cycle of the fan driving signal driving the first fan to zero by subtracting one predetermined duty interval from the duty cycle of the fan driving signal driving the first fan every predetermined working time interval.

Abstract: The present disclosure illustrates a bidirectional wireless charging device. The bidirectional wireless charging device comprises a transceiver chip which is configured to receive a switch signal. The transceiver chip comprises a power stage circuit and a control module. The power stage circuit is coupled to a coil, and the control module is coupled to the power stage circuit. The power stage circuit is configured to output a voltage to the coil, or to receive an induced voltage from the coil. The control module is configured to control the transceiver chip to enter a power mode or a charging mode based upon the switch signal. When the transceiver chip enters the power mode, the transceiver chip provides the voltage to the coil. When the transceiver chip enters the charging mode, the transceiver chip receives the induced voltage from the coil and charges a power storage unit.

Abstract: A motor speed control circuit including a voltage-dividing module, a first analog-to-digital converter, a second analog-to-digital converter and an operation module. The voltage-dividing module includes a first resistor unit and a second resistor unit. The first analog-to-digital converter receives a supply voltage and converts the supply voltage into a digital supply voltage. The second analog-to-digital converter receives a divided voltage generated by the voltage-dividing module, and converts the divided voltage into a digital divided voltage. The divided voltage is associated with a resistance ratio between the first resistor unit and the second resistor unit. The operation module receives the digital divided voltage and determines a motor speed curve according to the resistance ratio. The operation module generates a first pulse width modulation signal according to the motor speed curve and the digital supply voltage to drive a motor.

Abstract: A pop-free headset detection circuit includes a socket unit, a first operational amplifier, a second operational amplifier and a detection and control circuit. An inverting input end of the first operational amplifier is connected to a left-channel audio source. A non-inverting input end of the first operational amplifier receives a first reference voltage. An inverting input end of the second operational amplifier is connected to a right-channel audio source. A non-inverting input end of the second operational amplifier receives a second reference voltage. When there is a headset plug of a headset plugged into the socket unit, the detection and control circuit controls the first operational amplifier and the second operational amplifier to be in a Hi-Z state, disconnects the first operational amplifier and the second operational amplifier and their feedback resistors, and then determines the type of the headset.

Abstract: Provided herein are a single-inductor dual-output (SIDO) power converter operable in a discontinuous conduction mode and a control method thereof. The SIDO power converter is operable to switch between a boost mode and a buck-boost mode. The SIDO power converter dynamically adjusts output timings of clock signals with respect to the loads according to a load difference therebetween to lower the power consumption with a light load when the inductor current is zero to achieve optimal power distribution.

Abstract: The present disclosure illustrates a compensation circuit of an energy storage device. The compensation circuit includes a first error amplifier, a switching unit, a first RC network, a voltage recording module and a logic control module. The switching unit selectively connects an output end, a first input end of the first error amplifier or the voltage output end. A resistance value or a capacitance value of the first RC network changes with different sensing loops of the energy storage device. When the energy storage device switches the sensing loop, a detection circuit outputs a detecting signal. The logic control module controls the switching unit to connect the first input end to the output end, and controls the voltage recording module to output a preset output voltage to the voltage output end for stabilizing a first capacitor of the first RC network.

Abstract: A motor driving apparatus is disclosed, which stops driving a motor in a normal operation state and a start state. The motor driving apparatus adjusts a corresponding switch according to a pulse width modulation (PWM) table, to gradually increase a duty cycle of turning-on the corresponding switch. The PWM table indicates a relationship between a parameter and the duty cycle. The duty cycle increases with the monotone variation of the parameter. Accordingly, the motor driving apparatus can rapidly stop the operation of the motor, to avoid that the motor driving apparatus breaking down or the motor generating noise.

Abstract: Provided herein is a phase controller for a multi-phase voltage converter. The phase controller includes a plurality of logic control circuits, a phase selection circuit and a plurality of signal generators. The logic control circuits receive a plurality of phase-change signals and output a plurality of logic signals, respectively. The signal generators provide a plurality of bridge circuits with a plurality of phase selection signals to drive the bridge circuits. The phase selection circuit controls the signal generators according to the logic signals and a voltage determination signal. When the voltage determination signal stays at a high logic level for a pre-determined time period, the phase selection circuit controls the signal generators to output a plurality of phase selection signals at a high logic level to the bridge circuits such that the corresponding bridge circuits provide power at the same time.

Abstract: A switching driver capable of reducing EMI effect and power ripple is disclosed. When the switching driver wants to increase the voltage of an output end, a non-overlapping signal generator controls a low-side driver to quickly turn off a low-side switch, and detects an ascending slope of the voltage of the output end to control a cut-off velocity of a low-side auxiliary switch. When the switching driver wants to decrease the voltage of the output end, the non-overlapping signal generator controls a high-side driver to quickly turn off a high-side switch, and detects a descending slope of the voltage of the output end to control a cut-off velocity of a high-side auxiliary switch. As the descending slope becomes higher, the cut-off velocity of the high-side auxiliary switch becomes slower. Accordingly, the switching driver can reduce EMI effect and power ripple operating in a dead-time.