A two-wire load control device (such as, a dimmer switch) for controlling the amount of power delivered from an AC power source to an electrical load (such as, a high-efficiency lighting load) includes a thyristor coupled between the source and the load, a gate coupling circuit coupled between a first main load terminal and the gate of the thyristor, and a control circuit coupled to a control input of the gate coupling circuit. The control circuit generates a drive voltage for causing the gate coupling circuit to conduct a gate current to thus render the thyristor conductive at a firing time during a half cycle of the AC power source, and to allow the gate coupling circuit to conduct the gate current at any time from the firing time through approximately the remainder of the half cycle, where the gate coupling circuit conducts approximately no net average current to render and maintain the thyristor conductive.

A frequency converter adapted to be connected to another frequency converter via a direct current bus is provided. The frequency converter comprises: a positive bus interface adapted to be interconnected with a positive bus interface of the other frequency converter; an external bleeder resistor interface adapted to be interconnected with an external bleeder resistor interface of the other frequency converter; and a first control logic which controls a parallel connection, between the frequency converter and the other frequency converter and realized by a direct current bus, to be turned on or off. A corresponding frequency converter assembly, a control method, and a computer readable storage medium are also provided.

A power supply circuit includes at least two input terminals that receive an input voltage, a transformer including a primary side electrically connected to the input voltage, a rectifier electrically connected to a secondary side of the transformer, and a boost switch electrically connected in parallel with the rectifier and a pair of output voltage terminals that include a first output voltage terminal and a second output voltage terminal. The input voltage is electrically connected to an AC source, and each of the at least two input terminals receives a different phase of the AC source.

A method of controlling a switch-mode converter can include: obtaining an overcurrent reference threshold according to an output voltage sampling signal indicative of an output voltage of the switch-mode converter; and generating an over current protection triggering signal in response to an output current sampling signal indicative of an output current of the switch-mode converter and the overcurrent reference threshold meet a predetermined criterion, thereby triggering the switch-mode converter to enter a protection state.

A method of controlling a switch-mode converter can include: obtaining an overcurrent reference threshold according to an output voltage sampling signal indicative of an output voltage of the switch-mode converter; and generating an over current protection triggering signal in response to an output current sampling signal indicative of an output current of the switch-mode converter and the overcurrent reference threshold meet a predetermined criterion, thereby triggering the switch-mode converter to enter a protection state.

A high-voltage permanent magnet frequency conversion all-in-one machine according to an embodiment of the present disclosure includes a frequency converter configured to perform frequency conversion on a high-voltage alternating current, and output at least three alternating currents, a permanent magnet motor configured to receive the alternating currents subjected to the frequency conversion and output from the frequency converter, to drive the motor to operate, and a controller configured to control the frequency converter to perform the frequency conversion on the high-voltage alternating current, and control an operation state of the permanent magnet motor.

Provided is a system for an insulated-gate bipolar transistor (IGBT) rectifier for charging ultra-capacitors. The system may include a power converter, which may receive power from a power source. A direct current (DC) bus may be connected to the power converter and may receive power from the power converter. At least one IGBT may be connected to the DC bus and may receive power from the DC bus. An array of ultra-capacitors may be connected to the at least one IGBT. At least one controller may control the at least one IGBT to charge the array of ultra-capacitors. A method and computer program product are also disclosed.

Provided is a system for an insulated-gate bipolar transistor (IGBT) rectifier for charging ultra-capacitors. The system may include a power converter, which may receive power from a power source. A direct current (DC) bus may be connected to the power converter and may receive power from the power converter. At least one IGBT may be connected to the DC bus and may receive power from the DC bus. An array of ultra-capacitors may be connected to the at least one IGBT. At least one controller may control the at least one IGBT to charge the array of ultra-capacitors. A method and computer program product are also disclosed.

The present disclosure provides a light-emitting diode lamp designed to replace an incandescent filament bulb for illumination purposes in a transportation vehicle and a light-emitting diode circuit associated therewith.

Disclosed herein is a charger for charging electric vehicles. In one embodiment, the charger includes M AC/DC converters, a DC bus, N DC/DC converters, and D energy exchange ports. The M AC/DC converters are configured to be coupled to a power source at an input side of the M AC/DC converters. The DC bus is connected to an output side of each of the M AC/DC converters. The N DC/DC converters are coupled to the DC bus at an input side of the N DC/DC converters. The D energy exchange ports are coupled to an output side of one or more of the N DC/DC converters at an input side of the D energy exchange ports, and each of the D energy exchange ports is configured to be coupled to an electric vehicle, where N>M, and where an energy storage is coupled to the DC bus.