Abstract: An overshoot reduction circuit for a buck converter includes an operational amplifier, a first sampler circuit, a pulse generator circuit, a pulse calculator circuit, a second sampler circuit and a comparator. The operational amplifier outputs an operation amplified signal according to a buck converted signal of the buck converter and a voltage feedback signal of the operational amplifier. The first sampler circuit samples a first capacitor voltage signal according to a lower bridge conducted signal of the buck converter. The pulse generator circuit outputs a pulse signal. The pulse calculator circuit outputs a first sample compared signal according to the first capacitor voltage signal and the pulse signal. The second sampler circuit samples a second capacitor voltage signal according to the lower bridge conducted signal. The comparator compares the second capacitor voltage signal with the first sample compared signal to output a comparing signal to the buck converter.

Abstract: A charging device and a control method thereof are provided. The charging device includes an adapter, an energy storage unit and a charging module. The adapter provides an adapter current. The charging module receives the adapter current and provides a first charging current to charge the energy storage unit, or an output current to charge an electronic device. When the input current is larger than a first preset current and the first charging current is equal to or less than a third preset current, the charging module operates in a boost mode, such that the energy storage unit provides a second charging current to the charging module. When the second charging current is larger than the third preset current, the charging module enters a buck mode such that the energy storage unit is charged by the first charging current.

Abstract: Disclosed are a non-narrow voltage direct current (NON-NVDC) charger and a control method thereof. In the present disclosure, a proper target voltage, related to a turn-on voltage of a switch circuit, is determined according to an output voltage of a load, a storage voltage of an energy storage device and a turn-on resistance value of the switch circuit. Then, according to the determined target voltage, the NON-NVDC charger can enter a supplement mode at an appropriate time. The NON-NVDC charger can be operated stably and has excellent operation efficiency even when a current flowing through a transformer close to a maximum safe current.

Abstract: A driver circuit and a driving method with low inrush current are provided. The driving method includes steps of: supplying a charging current smaller than a high inrush current; outputting a pulse signal from a pulse generating circuit; enabling a light driving circuit to receive the charging current by the pulse signal and allowing the charging current to flow to an storage capacitor; turning on a switch component and a light-emitting assembly by the pulse signal; supplying an auxiliary current smaller than the high inrush current; enabling the light driving circuit to receive the auxiliary current and allowing auxiliary current to flow sequentially to the switch component and the light-emitting assembly; and emitting light by the light-emitting assembly with the discharging current of the storage capacitor and the auxiliary current of input power source.

Abstract: Disclosed are a non-narrow voltage direct current (NON-NVDC) charger and a control method thereof. In the present disclosure, a proper target voltage, related to a turn-on voltage of a switch circuit, is determined according to an output voltage of a load, a storage voltage of an energy storage device and a turn-on resistance value of the switch circuit. Then, according to the determined target voltage, the NON-NVDC charger can enter a supplement mode at an appropriate time. The NON-NVDC charger can be operated stably and has excellent operation efficiency even when a current flowing through a transformer close to a maximum safe current.

Abstract: An ambient light sensor is provided, which includes a photoelectric component, a variable capacitor, an operational amplifier, a comparator, a pulse generator circuit and a pulse accumulator circuit. The photoelectric component converts light energy into a photocurrent. The variable capacitor is connected between a first input terminal and an output terminal of the operational amplifier. A capacitance of the variable capacitor is adjusted according to the photocurrent. The operational amplifier outputs an amplified error signal based on a difference between an input voltage at its first input terminal and a reference voltage at its second input terminal. The comparator compares the amplified error signal with the reference voltage to output a comparison signal. The pulse generator circuit outputs a pulse signal based on the comparison signal. The accumulator circuit accumulates the number of counts that the input voltage is increased to a voltage larger than the reference voltage.

Abstract: An undervoltage protection circuit and an overvoltage protection circuit include a first comparator and a second comparator. The first comparator has a first input terminal, a second input terminal, and a first output terminal. The second comparator has a third input terminal, a fourth input terminal, and a second output terminal. The third input terminal receives a reference voltage and the fourth input terminal receives a first feedback voltage. The first and the second output terminals are coupled with a logic device. The first feedback voltage is converted to a second feedback voltage by the delay circuit and the voltage level shifter. The first comparator outputs a detection enabling voltage for undervoltage/overvoltage detection when the first feedback voltage crosses the second feedback voltage. The logic device outputs a protection voltage level undervoltage/overvoltage protection when the first feedback voltage crosses the reference voltage.

Abstract: A charging device and a control method thereof are provided. The charging device includes an adapter, an energy storage unit and a charging module. The adapter provides an adapter current. The charging module receives the adapter current and provides a first charging current to charge the energy storage unit, or an output current to charge an electronic device. When the input current is larger than a first preset current and the first charging current is equal to or less than a third preset current, the charging module operates in a boost mode, such that the energy storage unit provides a second charging current to the charging module. When the second charging current is larger than the third preset current, the charging module enters a buck mode such that the energy storage unit is charged by the first charging current.

Abstract: An undervoltage protection circuit and an overvoltage protection circuit include a first comparator and a second comparator. The first comparator has a first input terminal, a second input terminal, and a first output terminal. The second comparator has a third input terminal, a fourth input terminal, and a second output terminal. The third input terminal receives a reference voltage and the fourth input terminal receives a first feedback voltage. The first and the second output terminals are coupled with a logic device. The first feedback voltage is converted to a second feedback voltage by the delay circuit and the voltage level shifter. The first comparator outputs a detection enabling voltage for undervoltage/overvoltage detection when the first feedback voltage crosses the second feedback voltage. The logic device outputs a protection voltage level undervoltage/overvoltage protection when the first feedback voltage crosses the reference voltage.

Abstract: Disclosed are a charging device and a control method thereof. The charging device comprises an adapter, an energy storage unit and a charging module. The adapter provides an input current. The charging module receives the input current and provides a first charging current to charge the energy storage unit, or an output current to charge an electronic device. When the input current is higher than or equal to a preset current, the charging module works in a boost mode, such that the energy storage unit provides a second charging current to the charging module. The second charging current varies with the load of the electronic device. When the second charging current decreases to 0, the charging module turns to work in a buck mode, such that the energy storage unit is charged according to the input current.

Abstract: A charging current setting method for a charging module includes detecting at least two voltage values associated with two input current values of an input voltage signal at an input terminal of the charging module to calculate an input resistance; setting a lower limit voltage value of the input voltage signal according to the input resistance; controlling an input current to increase its magnitude, so that voltage level of the input voltage signal decreases in accordance with increasing level of the input current; controlling the input voltage signal to remain on the lower limit voltage value when the input voltage signal is decreasing and reaches the lower limit voltage value, and recording a magnitude of the input current as an upper limit current value when the input voltage signal is on the lower limit voltage value and the input current becomes stable; and determining a charging current value of the charging module according to the upper limit current value.

Abstract: A charging current setting method for a charging module includes detecting at least one voltage value of an input voltage signal in an input terminal of the charging module to calculate an input resistance; setting a lower limit voltage value according to the input resistance; controlling an input current to increase, so that the input voltage signal decreases in accordance with the increasing input current; controlling the input voltage signal to remain on the lower limit voltage value when the input voltage signal decreases to the lower limit voltage value, and recording a magnitude of the input current as an upper limit current value after the input current becomes stable; and determining a charging current value of the charging module according to the upper limit current value.

Abstract: The present invention discloses a current balance circuit for a multiphase DC-DC converter. The current balance circuit comprises a current error calculation circuit, for generating a plurality of current balance signals indicating imbalance levels of a plurality of inductor currents of a plurality of channels of the multiphase DC-DC converter according to a plurality of current sensing signals of the plurality of channels, a time shift circuit, for adjusting pulse widths of a plurality of clock signals according to the plurality of current balance signals, and a ramp generator, for deciding shift levels of a plurality of ramp signals according to the plurality of clock signals.

Abstract: The present invention discloses a dynamic voltage adjustment device for dynamically adjusting an output voltage of a power transmission system which generates the output voltage according to a feedback signal and a reference signal and transmits the output voltage to a remote load via a transmission line to generate a load current. The dynamic voltage adjustment device comprises a first signal terminal, for receiving a first signal corresponding to a forward transmission voltage drop of the transmission line; a second signal terminal, for receiving a second signal corresponding to a reverse transmission voltage drop of the transmission line; a third signal terminal for receiving a reference voltage; a feedback circuit, for generating a feedback signal according to the first signal; and a adder circuit, for generating the reference signal according to the second signal and the reference voltage.

Abstract: A control device for controlling a power management system to enter an operating mode includes a power converting device, for providing input power for the control device; an operating mode control signal, for controlling the power management system to enter the operating mode, wherein the operating mode control signal is a first signal of the power management system; and an operating result displaying signal, for displaying at least one operating result in the operating mode, wherein the operating result displaying signal is a second signal of the power management system.

Abstract: The present invention discloses a current balance circuit for a multiphase DC-DC converter. The current balance circuit comprises a current error calculation circuit, for generating a plurality of current balance signals indicating imbalance levels of a plurality of inductor currents of a plurality of channels of the multiphase DC-DC converter according to a plurality of current sensing signals of the plurality of channels, a time shift circuit, for adjusting pulse widths of a plurality of clock signals according to the plurality of current balance signals, and a ramp generator, for deciding shift levels of a plurality of ramp signals according to the plurality of clock signals.

Abstract: A soft switch driving circuit is disclosed for a DC converter, to transform an input voltage into an output voltage. The soft switch driving circuit includes a regulating module for outputting a reference voltage, a first bootstrap circuit for generating a first voltage value according to a DC voltage, a second bootstrap circuit for generating a second voltage value according to the reference voltage, a control module for generating a plurality of control signals according to a control voltage, a switch module having one end coupled to the first bootstrap circuit and another end coupled to the second bootstrap circuit for outputting a voltage signal, and an output circuit connected to the control module and the switch module for transforming the input voltage into the output voltage according to the voltage signal and one of the plurality of controlling signals.

Abstract: The present invention discloses a dynamic voltage adjustment device for dynamically adjusting an output voltage of a power transmission system which generates the output voltage according to a feedback signal and a reference signal and transmits the output voltage to a remote load via a transmission line to generate a load current. The dynamic voltage adjustment device comprises a first signal terminal, for receiving a first signal corresponding to a forward transmission voltage drop of the transmission line; a second signal terminal, for receiving a second signal corresponding to a reverse transmission voltage drop of the transmission line; a third signal terminal for receiving a reference voltage; a feedback circuit, for generating a feedback signal according to the first signal; and a adder circuit, for generating the reference signal according to the second signal and the reference voltage.

Abstract: A method capable of sensing a heavy load and a short circuit of a low dropout regulator includes providing a ramp pulse signal to the low dropout regulator, providing a square waveform, comparing a feedback signal of the low dropout regulator with the square waveform, and determining the low dropout regulator is a heavy load or a short circuit if a duration that the feedback signal is greater than a low voltage level of the square waveform and lower than a high voltage level of the square waveform is not greater than a pulse width of the square waveform. The method includes determining the low dropout regulator is a light load if the duration that the feedback signal is greater than the low voltage level of the square waveform and lower than the high voltage level of the square waveform is greater than the pulse width of the square waveform.

Abstract: A method capable of sensing a heavy load and a short circuit of a low dropout regulator includes providing a ramp pulse signal to the low dropout regulator, providing a square waveform, comparing a feedback signal of the low dropout regulator with the square waveform, and determining the low dropout regulator is a heavy load or a short circuit if a duration that the feedback signal is greater than a low voltage level of the square waveform and lower than a high voltage level of the square waveform is not greater than a pulse width of the square waveform. The method includes determining the low dropout regulator is a light load if the duration that the feedback signal is greater than the low voltage level of the square waveform and lower than the high voltage level of the square waveform is greater than the pulse width of the square waveform.