A duty timing detector includes: a control logic, the control logic being configured to: receive an input toggle signal and an output toggle signal that corresponds to the input toggle signal, and generate a difference signal using a difference between a duty of the input toggle signal and a duty of the output toggle signal; a first low-pass filter configured to output a DC input voltage based on a pulse width of the input toggle signal; a second low-pass filter configured to output a DC difference voltage based on a pulse width of the difference signal; a compensation circuit configured to compensate the duty of the output toggle signal using the DC input voltage and the DC difference voltage; and an oscillator configured to generate a duty-compensated output toggle signal, and to provide the duty-compensated output toggle signal to the control logic.

A duty cycle correction circuit includes a sawtooth wave generating unit, a voltage regulating unit, a differential comparator, a differential amplifier and low-pass filters. The sawtooth wave generating unit converts a narrow pulse signal into a sawtooth wave signal with a duty cycle of 50% which is input into the differential comparator. The voltage regulating unit regulates an input voltage value of a non-inverting input terminal of the differential comparator. The differential comparator compares a voltage difference between input signals of input terminals and outputs an output clock signal. The low-pass filters input DC components to the differential amplifier which amplifies the DC signals and output to the voltage regulating unit. The duty cycle correction circuit has a small chip occupying area to realize high integration of the chip, and the duty cycle of the output clock is accurately corrected to ensure the stability of the output clock frequency.

A high-order converter generates a first high-order voltage V.sub.U_P and a second high-order voltage V.sub.U_N that monotonously change with mutually opposite polarities with respect to high-order m bits (1≤m<n) of the digital signal. A low-order converter generates a first low-order voltage and a second low-order voltage that monotonously change with mutually opposite polarities with respect to low-order (n−m) bits of the digital signal. A first amplifier receives one of the first and the second high-order voltages and one of the first and the second low-order voltages to output one differential analog signal. Having a configuration in common with the first amplifier, a second amplifier receives another of the first and the second high-order voltages and another of the first and the second low-order voltages to output another differential analog signal.

Circuitry for measuring a characteristic of an electrochemical cell, the circuitry comprising: a comparator having a first comparator input, a second comparator input and a comparator output; a feedback path between the comparator output and the second comparator input configured to provide a feedback signal to the second comparator input; and a loop filter configured to apply filtering to the feedback path to generate the feedback signal, wherein the loop filter comprises the electrochemical cell.

A power monitor includes a detecting circuit, a processing circuit, and a warning circuit. The detecting circuit detects a first abnormal condition of a primary side circuit and a second abnormal condition of a secondary side circuit. The processing circuit calculates a first class and a first occurring number of the first abnormal condition, and calculates a second class and a second occurring number of the second abnormal condition. The processing circuit determines whether the first occurring number is larger than a first predetermined number corresponding to the first class; if it is, the processing circuit outputs a first abnormal signal. The processing circuit determines whether the second occurring number is larger than a second predetermined number corresponding to the second class; if it is, the processing circuit outputs a second abnormal signal. The warning circuit outputs a warning signal according to the first or the second abnormal signal.

A switching amplifier system with a power supply, a pulse modulator configured to modulate an input signal into a pulse width modulation signal, a switching stage configured to generate an amplified output signal, and an error feedback signal configured to correct errors in the amplified output signal, where the input signal is comprised of at least one of an analog signal and a digital signal. A method of signal amplification comprising generating, by a pulse width modulator, a pulse width modulation signal, combining, by a switching stage, the input signal and the pulse width modulation signal to form an amplified output signal, and generating, by the switching stage, an error feedback signal, where the error feedback signal is configured to correct errors in the amplified output signal, and where the input signal is comprised of at least one of an analog signal and a digital signal.

A switching amplifier system with a power supply, a pulse modulator configured to modulate an input signal into a pulse width modulation signal, a switching stage configured to generate an amplified output signal, and an error feedback signal configured to correct errors in the amplified output signal, where the input signal is comprised of at least one of an analog signal and a digital signal. A method of signal amplification comprising generating, by a pulse width modulator, a pulse width modulation signal, combining, by a switching stage, the input signal and the pulse width modulation signal to form an amplified output signal, and generating, by the switching stage, an error feedback signal, where the error feedback signal is configured to correct errors in the amplified output signal, and where the input signal is comprised of at least one of an analog signal and a digital signal.

A power-control device comprises an energy-import portion and an energy-export portion. The power-control device may additionally include a general processing and power supply circuit providing linear control of the power-control device's production of power to the load. The energy-import portion is coupled between a V.sub.LINE terminal and a load terminal, and is capable of importing energy to the load terminal during a first portion and a third portion of an alternating voltage V.sub.AC waveform. The energy-export portion is coupled between the load terminal and a NEU terminal, and is capable of exporting energy from the load terminal during a second portion and a fourth portion of the alternating voltage V.sub.AC waveform. The first, second, third and fourth portions of the alternating voltage V.sub.AC waveform are equal to a period of the alternating voltage V.sub.AC waveform and respectively are consecutive during the period of the alternating voltage V.sub.AC waveform. The power-control device provides variable power control to the load terminal in response to a variable on/off time of a PWM control signal.

A power-control device comprises an energy-import portion and an energy-export portion. The power-control device may additionally include a general processing and power supply circuit providing linear control of the power-control device's production of power to the load. The energy-import portion is coupled between a V.sub.LINE terminal and a load terminal, and is capable of importing energy to the load terminal during a first portion and a third portion of an alternating voltage V.sub.AC waveform. The energy-export portion is coupled between the load terminal and a NEU terminal, and is capable of exporting energy from the load terminal during a second portion and a fourth portion of the alternating voltage V.sub.AC waveform. The first, second, third and fourth portions of the alternating voltage V.sub.AC waveform are equal to a period of the alternating voltage V.sub.AC waveform and respectively are consecutive during the period of the alternating voltage V.sub.AC waveform. The power-control device provides variable power control to the load terminal in response to a variable on/off time of a PWM control signal.

A power controller with a cable connected remote controlling device configured to transmit a pulsed instruction signal according to a predetermined signal pattern to the power controller. The power controller determines if the instruction signal corresponds with a predetermined signal pattern. If the instruction signal corresponds with a predetermined signal pattern, the controller passes the instruction signal to switches that control power supply of an electric device.