The disclosure discloses a method and device for detecting insulation state in a conversion system, wherein the conversion system includes an excitation source, a converter having an input end coupled to the excitation source, a connection element coupled between an output end of the converter and a reference point, and a coupling impedance having a first end coupled to the excitation source and a second end coupled to the reference point, the method for detecting insulation state including steps of: S1, controlling at least one main power switch of the converter not to switch; S2, detecting a pulse current signal of the connection element; and S3, processing the pulse current signal and outputting a partial discharge information, the partial discharge information indicating an insulation state of an isolating transformer in the converter. The disclosure can overcome electromagnetic interference of high frequency steep waves on a partial discharge signal.

A fuel dispenser includes a power distribution system having an alternating current (AC) power supply and an AC to direct current (DC) power converter configured to convert a portion of the AC power to DC power for one or more DC peripheral components associated with the fuel dispenser. The power distribution system also includes processing circuitry configured to power down at least one of the DC peripheral components in response to an actuator, cause an indicator to be activated indicating that the DC peripheral components are de-energized and the AC power supply is active, power up the at least one direct current peripheral component in response to the actuator when the direct current peripherals are de-energized, and cause the indicator to be activated to indicate that both the DC peripheral components and the AC power supply are active.

A fuel dispenser includes a power distribution system having an alternating current (AC) power supply and an AC to direct current (DC) power converter configured to convert a portion of the AC power to DC power for one or more DC peripheral components associated with the fuel dispenser. The power distribution system also includes processing circuitry configured to power down at least one of the DC peripheral components in response to an actuator, cause an indicator to be activated indicating that the DC peripheral components are de-energized and the AC power supply is active, power up the at least one direct current peripheral component in response to the actuator when the direct current peripherals are de-energized, and cause the indicator to be activated to indicate that both the DC peripheral components and the AC power supply are active.

A power supply unit for an aerosol inhaler includes: a case; a power supply that discharges power to a load for generating an aerosol from an aerosol generation source; a discharging terminal that connects the load to the power supply; a charging terminal that connects the power supply to an external power supply and is separated from the discharging terminal; a temperature measuring unit that measures temperature of the power supply; and a control device that controls an effective value of a first charging current to a value smaller than an effective value of a second charging current. The first charging current is supplied to the power supply when a measurement value of the temperature measuring unit is equal to or higher than a first threshold and the second charging current is supplied to the power supply when the measurement value is lower than the first threshold.

This application provides a power rectification method and apparatus, to supply power to a load by using a power supply capacity gap formed by a communications power that is at an existing network site, thereby achieving a capacity increase. The method includes: obtaining a total input current of each of three phase lines; and when it is determined that a total input current of at least one of the three phase lines is greater than a total input current threshold corresponding to the at least one phase line, adjusting a rectifier connected to the at least one phase line to reduce a total input power of the at least one phase line, so that the total input current of the at least one phase line is less than or equal to the total input current threshold corresponding to the at least one phase line.

A control chip applied in a switching power supply, where the switching power supply includes a rectifier circuit for receiving an AC input voltage and generating a rectified voltage, the control chip including: a high-voltage pin; a detection circuit coupled to the high-voltage pin to determine whether the high-voltage pin is coupled to the AC input voltage or the rectified voltage according to a sampling voltage representing a voltage received by the high-voltage pin; and a discharge circuit, where when the high-voltage pin is determined to be coupled to the AC input voltage, the control chip can enable the discharge circuit to discharge a safety capacitor coupled to an input port of the switching power supply after the switching power supply is powered off, and when the high-voltage pin is determined to be coupled to the rectified voltage, the control chip can disable the discharge circuit.

An AC/DC Switching Mode Power Supply (SMPS) comprises a PFC stage, an isolated LLC DC/DC converter stage, and a control circuit that provides feedback/control signals to PFC and LLC controllers, to enable a plurality of operating modes, dependent on a sensed peak AC input voltage and required output voltage Vo. The PFC provides a first DC bus voltage Vdc (e.g. 200V) for low line AC input and a second DC bus voltage (e.g. 400V) for high line or universal AC input. A multi-mode LLC converter is operable in a half-bridge mode or a full-bridge mode. For low line AC input, output voltage Vo, and PFC output Vdc, the LLC operates in full-bridge mode; for high line input, output voltage Vo and PFC output 2×Vdc, the LLC operates in half-bridge mode; for universal AC input, output voltage 2×Vo, and PFC output 2×Vdc, the LLC operates in full-bridge mode.

An AC/DC Switching Mode Power Supply (SMPS) comprises a PFC stage, an isolated LLC DC/DC converter stage, and a control circuit that provides feedback/control signals to PFC and LLC controllers, to enable a plurality of operating modes, dependent on a sensed peak AC input voltage and required output voltage Vo. The PFC provides a first DC bus voltage Vdc (e.g. 200V) for low line AC input and a second DC bus voltage (e.g. 400V) for high line or universal AC input. A multi-mode LLC converter is operable in a half-bridge mode or a full-bridge mode. For low line AC input, output voltage Vo, and PFC output Vdc, the LLC operates in full-bridge mode; for high line input, output voltage Vo and PFC output 2×Vdc, the LLC operates in half-bridge mode; for universal AC input, output voltage 2×Vo, and PFC output 2×Vdc, the LLC operates in full-bridge mode.

A power supply unit includes: a power supply configured to discharge power to a load for generating an aerosol from an aerosol generation source; a charger configured to convert inputted power into charging power; a temperature measuring unit configured to measure a temperature of the power supply; and a charging controller configured to perform a first control for stopping the charger from supplying the charging power to the power supply and a second control for causing the charger to supply the charging power to the power supply, the charging controller setting a duty ratio to a value greater than 0 and smaller than 100 in a case where the temperature of the power supply is within a predetermined range, and the duty ratio being obtained by dividing a time during which the charging controller performs the first control by a unit time.

A voltage-mode integrate-and-dump photonic ADC front-end circuit includes a current integrator for immediately integrating current pulses onto a capacitor voltage, the current pulses converted by photodetectors from optical data pulses corresponding to a received analog input signal. The circuit may include dampeners for reducing voltage ringing and resulting intersymbol interference (ISI) to preserve SNR at high data rates. The integrating capacitor may be discharged by a reset switch based on clock signals generated by a master clock; the reset switch may include a pulse width controller enabling the integrating capacitor to track and hold the integrated voltage, rather than downstream sample-and-hold amplifiers. Quantizers and other signal processors generate digital signal output by sampling and digitizing the integrated voltage output of the current integrator.