A method of controlling a display device is a method for controlling a display device including a light modulation sheet switchable between a transparent state and an opaque state. When an operation to turn on the display device is obtained, a PWM waveform for generating an alternating voltage based on a direct voltage is output, the alternating voltage having a duty cycle of 50% at a phase of 0 degrees or 180 degrees, the alternating voltage is generated from the direct voltage, based on the PWM waveform output, and the alternating voltage generated is output to the light modulation sheet.

To allow reliable current measurement of the output current of the switching stage of an inverter, especially at switching frequencies of the semiconductor switches in the 100 kHz range, a voltage at the choke is measured and integrated over time to be representative for the leg current in the choke. The time integral is processed in a processing unit, whereas the processed time integral is used in an inverter controller for controlling the inverter. The voltage at the choke is analogously integrated over time by two serially connected integrator capacitors, whereas across each of the integrator capacitors a reset switch is provided, for alternately resetting the corresponding integrator capacitor.

Embodiments of this application provide a power system. An output terminal of a power supply or a DC-to-DC unit is cascaded. In addition, according to the power system provided in embodiments of this application, a quantity of cables from the power supply or the DC-to-DC unit to the DC-to-AC unit may be further reduced by cascading an output terminal of the power supply or the DC-to-DC unit and cascading an input of the DC-to-AC unit.

An AC generation circuit is attached to a secondary battery, and includes a circuit configured to generate an alternating current at both ends of the secondary battery, a current limiting element connected between a positive electrode side of the circuit and a positive element of the secondary battery and/or between a negative electrode side of the circuit and a negative electrode of the secondary battery, and a capacitor connected in parallel to the current limiting element.

A control method and device of a voltage converter and a voltage control system are provided. In some embodiments, the control device includes a first control module configured to obtain a current reference value according to an output voltage of a voltage converter and a given voltage value; a current modulation module configured to reduce the current reference value when an output current of a voltage converter is greater than a first current threshold; and a second control module configured to control the output current of a voltage converter according to the reduced current reference value and an output current.

Disclosed is a control apparatus for an electric power generation system. The electric power generation system is configured to generate electric power and thereby charge a secondary battery that is an electric power source of a motor included in an electric drive system. The electric drive system further includes an inverter circuit for driving the motor and a power transmission unit for transmitting electric power from the secondary battery to the inverter circuit. The control apparatus includes a temperature acquisition unit and a power generation control unit. The temperature acquisition unit is configured to acquire a temperature of the power transmission unit. The power generation control unit is configured to control the electric power generation system to generate electric power and thereby charge the secondary battery when the temperature of the power transmission unit acquired by the temperature acquisition unit is higher than or equal to a predetermined threshold temperature.

This uninterruptible power supply apparatus includes an uninterruptible power supply module, an input module, and a control module that is disposed in a left-right direction of the input module. The control module is configured such that at least arrangement positions of the thyristor unit and the control unit that controls power conversion of the uninterruptible power supply module are interchangeable in a left-right direction, in the housing.

Provided are an electronic drive device and an electronic steering device, in each of which: a mounting substrate has one surface as a first surface on which a first heat generating component is mounted and the other surface as a second surface on which a second heat generating component is mounted; a first heat dissipation member is arranged in contact with the second surface at a position corresponding to a mounted position of the first heat generating component such that heat generated by the first heat generating component is dissipated to a motor housing; and a second heat dissipation member is arranged in contact with the first surface at a position corresponding to a mounted position of the second heat generating component such that heat generated by the second heat generating component is dissipated to a cover.

An electronic appliance such as a low harmonic drive, an active rectifier, a grid converter or any active front end or grid converter with an LCL filter. The converter is a two-level, a three-level or a multilevel inverter. The electronic appliance includes an LCL filter on a grid side of the electronic appliance and an active front end rectifier provided on a load side of the electronic appliance. The LCL filter includes grid side inductors and an active front end rectifier is connected to the LCL filter. A method for damping a corresponding electronic appliance is also disclosed.

An electrical energy storage device for use in an electrical distribution grid where storage may be located across various voltage transitions throughout the network, enabling energy to bypass stepdown transformers, monitoring on both sides of a transformer, and power conditioning to optimize transformer and grid performance.