A powerline load monitor has a voltage sense input, a current sense input, a clock input and a data output. It includes first and second ADCs coupled with the voltage sense and current sense input, and coupled with a serial interface. A power manager is coupled with the clock input, the ADCs, and the serial interface. When the power manager receives a first clock, it puts the powerline load monitor in active mode and starts a first timer with a first timeout time. The first and second ADC convert a sensed voltage and a sensed current to digital values for the serial interface. When the serial interface receives a trailing edge of a clock pulse, it outputs a data bit of the digital values. When the first timer times out, the power manager puts the powerline load monitor in a standby mode to save power.

A powerline load monitor has a voltage sense input, a current sense input, a clock input and a data output. It includes first and second ADCs coupled with the voltage sense and current sense input, and coupled with a serial interface. A power manager is coupled with the clock input, the ADCs, and the serial interface. When the power manager receives a first clock, it puts the powerline load monitor in active mode and starts a first timer with a first timeout time. The first and second ADC convert a sensed voltage and a sensed current to digital values for the serial interface. When the serial interface receives a trailing edge of a clock pulse, it outputs a data bit of the digital values. When the first timer times out, the power manager puts the powerline load monitor in a standby mode to save power.

A detection circuit for a switching converter, whereby: the detection circuit is coupled in parallel with an output capacitor of the switching converter, and is configured to provide a detection branch coupled in parallel with the output capacitor during a first period of a switching cycle, in order to detect an output voltage of the switching converter; and an output voltage detection signal is generated according to the detected output voltage during a second period of the switching cycle. A switching converter can include the detection circuit and an integrated circuit.

A detection circuit for a switching converter, whereby: the detection circuit is coupled in parallel with an output capacitor of the switching converter, and is configured to provide a detection branch coupled in parallel with the output capacitor during a first period of a switching cycle, in order to detect an output voltage of the switching converter; and an output voltage detection signal is generated according to the detected output voltage during a second period of the switching cycle. A switching converter can include the detection circuit and an integrated circuit.

A method of controlling a multi-phase power converter having a plurality of power stage circuits coupled in parallel, can include: obtaining a load current of the multi-phase power converter; enabling corresponding power stage circuits to operate in accordance with the load current, such that a switching frequency is maintained within a predetermined range when the load current changes; and controlling the power stage circuits to operate under different modes in accordance with the load current, such that the switching frequency is maintained within the predetermined range when the load current changes.

A method of controlling a multi-phase power converter having a plurality of power stage circuits coupled in parallel, can include: obtaining a load current of the multi-phase power converter; enabling corresponding power stage circuits to operate in accordance with the load current, such that a switching frequency is maintained within a predetermined range when the load current changes; and controlling the power stage circuits to operate under different modes in accordance with the load current, such that the switching frequency is maintained within the predetermined range when the load current changes.

A method and a system for extracting a characteristic signal from a power frequency signal, and a file management method therefor are provided. The method includes steps of: S1, detecting a voltage half-wave zero-crossing area in a single voltage cycle in the power frequency signal by a signal triggering device; superimposing a voltage modulation signal on the voltage half-wave zero-crossing area, and superimposing an instantaneous pulse on a current cycle in the power frequency signal corresponding to the voltage half-wave zero-crossing area to form a current modulation signal; generating the characteristic signal with multiple continuous current cycles and multiple voltage cycles; S2, demodulating in real time whether there is the voltage modulation signal in the power frequency signal by a signal identification device, if so, executing step S3; if not, performing no operation; and S3, demodulating the characteristic signal by the signal identification device to obtain the current modulation signal and the voltage modulation signal respectively; and determining whether data corresponding to the current modulation signal and date corresponding to the voltage modulation signal are predetermined data, wherein if so, the characteristic signal exists; if not, no characteristic signal exists. The method has strong anti-interference ability and high signal demodulation accuracy, which is suitable for industrial distribution networks with large interference.

A method and a system for extracting a characteristic signal from a power frequency signal, and a file management method therefor are provided. The method includes steps of: S1, detecting a voltage half-wave zero-crossing area in a single voltage cycle in the power frequency signal by a signal triggering device; superimposing a voltage modulation signal on the voltage half-wave zero-crossing area, and superimposing an instantaneous pulse on a current cycle in the power frequency signal corresponding to the voltage half-wave zero-crossing area to form a current modulation signal; generating the characteristic signal with multiple continuous current cycles and multiple voltage cycles; S2, demodulating in real time whether there is the voltage modulation signal in the power frequency signal by a signal identification device, if so, executing step S3; if not, performing no operation; and S3, demodulating the characteristic signal by the signal identification device to obtain the current modulation signal and the voltage modulation signal respectively; and determining whether data corresponding to the current modulation signal and date corresponding to the voltage modulation signal are predetermined data, wherein if so, the characteristic signal exists; if not, no characteristic signal exists. The method has strong anti-interference ability and high signal demodulation accuracy, which is suitable for industrial distribution networks with large interference.

Method and system for evaluating an input voltage of a power supply or a switched-mode power supply, wherein the input voltage has a constant polarity, where a digitized input voltage is supplied as the input signal to a filter which is filtered such that an output signal from the filter lags the input signal of the filter at the input of the filter, where the input signal and the output signal of the filter are compared, where comparison results are evaluated during an evaluation period until, following a first change in state of a comparison result, a further change in state of the comparison result is identified, and where a respective evaluation period is then terminated and subsequently, a period duration and/or a frequency of an AC voltage component of the input voltage are determined using the present count value of a counter.

A zero-crossing detector to be installed in a ceiling fan includes: a first terminal; a second terminal; and a rectifier, an adjustor and a feedback generator that cooperatively generate a current signal based on an AC voltage between the first and second terminals. The current signal has a non-zero magnitude when the AC voltage causes a potential at the first terminal to be greater than a potential at the second terminal, and has a zero magnitude when otherwise. An average of the non-zero magnitude of the current signal is greater when the adjustor is in a working state than when the adjustor is in a power saving state. The feedback generator generates a feedback signal based on the current signal.