Abstract: An inverter includes: a high electric potential input terminal, a low electric potential input terminal, an output terminal that outputs AC power, a transistor pair, a driver that performs complementary switching control of the transistor pair. The driver includes a current adjustment element that adjusts the channel current and a voltage adjustment element that adjusts the channel voltage of the transistor pair, and adjusts, in the switching control of the transistor pair, the time change rate of the channel current to be larger than the time change rate of the channel voltage.

Abstract: A motor drive system includes: a first inverter connected to one end of an open-end winding of a three-phase motor, an input voltage from a single-phase AC power source being rectified into a rectified voltage and input to the first inverter; a second inverter connected to another end of the open-end winding and including a DC link capacitor; and a control unit that controls the first inverter so that a first inverter output voltage supplied from the first inverter to the three-phase motor is in phase with a motor current flowing in the three-phase motor, controls the second inverter to supply reactive power to the three-phase motor by making a second inverter output voltage supplied from the second inverter to the three-phase motor orthogonal to the motor current in order to make an instantaneous power supplied from the DC link capacitor to the three-phase motor zero, and also controls the second inverter so that a q-axis component of the second inverter output voltage orthogonal to a d-axis component, which

Abstract: The disclosure relates to a handrail treatment device which comprises a housing and a cylindrical base body which is arranged in the housing so as to be rotatable about an axis of rotation. A cleaning facing is arranged on a cylinder outer surface of the base body, over which a circulating handrail of a passenger transport system can be guided for the purpose of removing dirt and germs. At least one radiation source is arranged inside the housing, which radiation source can emit germicidal electromagnetic radiation, wherein the radiation source is aligned with the base body in such a way that the cleaning facing moving continuously past the radiation source is exposed to the germicidal electromagnetic radiation of this radiation source when the base body rotates.

Abstract: A motor drive apparatus includes: a rectifier circuit that converts a power supply voltage from a single-phase or three-phase AC power supply into a DC voltage; an inverter circuit that converts the DC voltage output from the rectifier circuit into a motor drive voltage and outputs the motor drive voltage to a motor; a control unit that controls the rectifier circuit and the inverter circuit; and a detection unit that detects a decrease in the power supply voltage based on a voltage value or phase of the power supply voltage. The control unit controls the rectifier circuit and the inverter circuit to output a motor power calculated from a target speed of the motor to the motor, when a decrease in the power supply voltage is not detected. The control unit controls the inverter circuit to maintain a voltage of a DC link connecting the rectifier circuit and the inverter circuit by using regenerative power obtained from the motor, when a decrease in the power supply voltage is detected.

Abstract: A motor drive system includes: a first inverter connected to one end of an open-end winding of a three-phase motor, an input voltage from a single-phase AC power source being rectified into a rectified voltage and input to the first inverter; a second inverter connected to another end of the open-end winding and including a DC link capacitor; and a control unit that controls the first inverter so that a first inverter output voltage supplied from the first inverter to the three-phase motor is in phase with a motor current flowing in the three-phase motor, controls the second inverter to supply reactive power to the three-phase motor by making a second inverter output voltage supplied from the second inverter to the three-phase motor orthogonal to the motor current in order to make an instantaneous power supplied from the DC link capacitor to the three-phase motor zero, and also controls the second inverter so that a q-axis component of the second inverter output voltage orthogonal to a d-axis component, which

Abstract: An inverter includes: a high electric potential input terminal, a low electric potential input terminal, an output terminal that outputs AC power, a transistor pair, a driver that performs complementary switching control of the transistor pair. The driver includes a current adjustment element that adjusts the channel current and a voltage adjustment element that adjusts the channel voltage of the transistor pair, and adjusts, in the switching control of the transistor pair, the time change rate of the channel current to be larger than the time change rate of the channel voltage.

Abstract: The disclosure relates to a handrail treatment device which comprises a housing and a cylindrical base body which is arranged in the housing so as to be rotatable about an axis of rotation. A cleaning facing is arranged on a cylinder outer surface of the base body, over which a circulating handrail of a passenger transport system can be guided for the purpose of removing dirt and germs. At least one radiation source is arranged inside the housing, which radiation source can emit germicidal electromagnetic radiation, wherein the radiation source is aligned with the base body in such a way that the cleaning facing moving continuously past the radiation source is exposed to the germicidal electromagnetic radiation of this radiation source when the base body rotates.

Abstract: An AC-AC converter circuit converts an AC voltage into a further AC voltage. A rectifier circuit rectifies the AC voltage. An inverter circuit generates the further AC voltage. AZ source circuit is provided between the rectifier circuit and the inverter circuit.

Abstract: An AC-AC power convertor converts a first AC voltage to a second AC voltage. A PFC rectifier circuit rectifies an AC voltage (vG) so as to generate a rectified voltage. An inverter generates the second AC voltage from the rectified voltage. A controller controls the PFC rectifier circuit and the inverter such that power generated by the first AC voltage and the pulsations of power generated by the rectified voltage are output to an external device.

Abstract: An AC-AC converter circuit converts an AC voltage into a further AC voltage. A rectifier circuit rectifies the AC voltage. An inverter circuit generates the further AC voltage. AZ source circuit is provided between the rectifier circuit and the inverter circuit.

Abstract: An AC-AC power convertor converts a first AC voltage to a second AC voltage. A PFC rectifier circuit rectifies an AC voltage (vG) so as to generate a rectified voltage. An inverter generates the second AC voltage from the rectified voltage. A controller controls the PFC rectifier circuit and the inverter such that power generated by the first AC voltage and the pulsations of power generated by the rectified voltage are output to an external device.