The present disclosure discloses a zero-crossing detection circuit, including: a zero-crossing judgment module, having a first end and a second end, wherein the first end is connected to a power supply and the second end is grounded; a photoelectric coupler, connected to the zero-crossing judgment module; an optocoupler driving module, connected to the photoelectric coupler; and an energy storage capacitor, wherein the energy storage capacitor is configured to provide excitation power for the photoelectric coupler and the optocoupler driving module.

The present disclosure discloses a zero-crossing detection circuit, including: a zero-crossing judgment module, having a first end and a second end, wherein the first end is connected to a power supply and the second end is grounded; a photoelectric coupler, connected to the zero-crossing judgment module; an optocoupler driving module, connected to the photoelectric coupler; and an energy storage capacitor, wherein the energy storage capacitor is configured to provide excitation power for the photoelectric coupler and the optocoupler driving module.

A circuit breaker includes an electromechanical switch, a current sensor, a voltage sensor, and a processor. The electromechanical switch is serially connected between a line input terminal and a load output terminal of the circuit breaker, and configured to be placed in a switched-closed state or a switched-open state. The current sensor is configured to sense a magnitude of current flowing in a path between the line input and load output terminals and generate a current sense signal. The voltage sensor is configured to sense a magnitude of voltage at a point on the path between the line input and load output terminals and generate a voltage sense signal. The processor is configured to receive and process the current sense signal and the voltage sense signal to determine operational status information of the circuit breaker and determine power usage information of a load connected to the load output terminal.

A circuit breaker includes an electromechanical switch, a current sensor, a voltage sensor, and a processor. The electromechanical switch is serially connected between a line input terminal and a load output terminal of the circuit breaker, and configured to be placed in a switched-closed state or a switched-open state. The current sensor is configured to sense a magnitude of current flowing in a path between the line input and load output terminals and generate a current sense signal. The voltage sensor is configured to sense a magnitude of voltage at a point on the path between the line input and load output terminals and generate a voltage sense signal. The processor is configured to receive and process the current sense signal and the voltage sense signal to determine operational status information of the circuit breaker and determine power usage information of a load connected to the load output terminal.

A system and method for detecting deteriorated junctions within an electrical circuit includes a voltage channel circuit, a load circuit, and a microcontroller. The voltage channel circuit is connectable to the electrical circuit and includes a multiplier circuit, a peak detector circuit, and a filter circuit. The multiplier circuit is configured to square a line voltage of the electrical circuit. The peak detector circuit is configured to detect peak voltages of the line voltage based on an output of the multiplier circuit. A DC output voltage is provided from the filter circuit based on the output of the multiplier circuit. The load circuit is connectable to the electrical circuit and includes a plurality of resistors and a plurality of switches controlled by the microcontroller to enable current flow through the plurality of resistors to control the line voltage. The microcontroller is configured to detect deteriorated junctions based upon comparison of an output of the peak detector circuit and the DC output voltage.

A resonant core power supply includes a core with excitation, resonant, and load windings where the resonant winding is coupled to a tank circuit and a controller manipulates the phase, amplitude and waveform of an excitation signal applied to the excitation winding.

A resonant core power supply includes a core with excitation, resonant, and load windings where the resonant winding is coupled to a tank circuit and a controller manipulates the phase, amplitude and waveform of an excitation signal applied to the excitation winding.

The present disclosure discloses a zero-crossing detection circuit, including: a zero-crossing judgment circuit, configured to detect a zero-crossing signal; and an energy storage capacitor, connected to the zero-crossing judgment circuit in parallel, wherein the energy storage capacitor is configured to provide excitation current for the zero-crossing judgment circuit.

The present disclosure discloses a zero-crossing detection circuit, including: a zero-crossing judgment circuit, configured to detect a zero-crossing signal; and an energy storage capacitor, connected to the zero-crossing judgment circuit in parallel, wherein the energy storage capacitor is configured to provide excitation current for the zero-crossing judgment circuit.

A voltage converter includes a converting circuit having an inductor connected to a switching node, a first switch element connected between the switching node and a ground voltage, and a second switch element connected between the switching node and an output node; and a switching control circuit configured to adjust a feedback voltage divided from an output voltage of the output node based on a current state of the inductor, and configured to generate switching control signals for charging the inductor with an input voltage and discharging a voltage charged in the inductor, based on a sensing signal based on a current of the inductor and the adjusted feedback voltage.