Provided is a power conversion device that achieves both downsizing and improvement in cooling efficiency to have improved reliability. The power conversion device includes a power conversion circuit unit which converts DC power into AC power, a flow path including body for letting a refrigerant for cooling the power conversion circuit unit flow, a filter circuit unit which suppresses electric noise from a wire for transmitting the DC power, and a filter case portion which houses the filter circuit unit, where the filter case portion is formed integrally with the flow path including body, and a gap between the filter case portion and the filter circuit unit is filled with a first resin.

Provided is a power conversion device that achieves both downsizing and improvement in cooling efficiency to have improved reliability. The power conversion device includes a power conversion circuit unit which converts DC power into AC power, a flow path including body for letting a refrigerant for cooling the power conversion circuit unit flow, a filter circuit unit which suppresses electric noise from a wire for transmitting the DC power, and a filter case portion which houses the filter circuit unit, where the filter case portion is formed integrally with the flow path including body, and a gap between the filter case portion and the filter circuit unit is filled with a first resin.

An energy combiner apparatus is used to convert output of a power supply, and has three output terminals, so that output ports are increased. In the three output terminals of the energy combiner apparatus, a voltage of 1500 V is output between a first output terminal and a second output terminal, a voltage of 1500 V is also output between the second output terminal and a third output terminal, and a total of 3 kV is output. Therefore, an overall output voltage is increased in a case of equal output power. Because the overall output voltage is increased, a current transmitted on a cable may be reduced. Therefore, a thinner cable may be used, so that costs of the cable are reduced. In addition, four cables conventionally required for connecting to the output terminals of the energy combiner apparatus are reduced to three, so that quantity and costs are reduced.

Power converting devices (100) for power tools. One embodiment provides a power converter device (100) including a power source (200), a power converter (210) coupled to the power source (200), and an electronic processor (220) coupled to the power converter (210) to control the operation of the power converter (210). The power converter (210) is configured to receive an input power in one form or at a first voltage from the power source and convert the input power to an output power in another form or at a second voltage. The power converter (210) includes at least one wide bandgap field effect transistor controlled by the electronic processor (220) to convert the input power to output power.

An electronic control device for power conversion having an integrated safety function and improved reliability includes: a power module for converting DC power into AC power and supply the AC power to a motor; a gate driver for controlling the power module; a microcontroller for controlling the gate driver: a power supply IC for supplying power to at least one of the gate driver and the microcontroller: a discharge circuit for discharging a high voltage supplied to the power module; and a sensor. The power supply IC includes a microcomputer abnormality detection circuit for detecting an abnormality of the microcontroller and a safety processing circuit for determining necessity of safety processing based on an output of at least one of the microcomputer abnormality detection circuit and the sensor and performs the safety processing. The safety processing circuit stops the motor or discharges a high voltage using the discharge circuit.

An electronic control device for power conversion having an integrated safety function and improved reliability includes: a power module for converting DC power into AC power and supply the AC power to a motor; a gate driver for controlling the power module; a microcontroller for controlling the gate driver: a power supply IC for supplying power to at least one of the gate driver and the microcontroller: a discharge circuit for discharging a high voltage supplied to the power module; and a sensor. The power supply IC includes a microcomputer abnormality detection circuit for detecting an abnormality of the microcontroller and a safety processing circuit for determining necessity of safety processing based on an output of at least one of the microcomputer abnormality detection circuit and the sensor and performs the safety processing. The safety processing circuit stops the motor or discharges a high voltage using the discharge circuit.

A method for energizing a motor with a rotor by turning on a different portion of all arms, for each energization pattern, among the arms of an inverter, is provided. The method includes generating a PWM signal, for each phase, with a duty cycle of a same value, the PWM signal having a first period length that is defined by a first period during which a portion of the arms is turned on with a first energization pattern, during an idle time of the rotor; a second period during which a portion of the arms is turned on with a second energization pattern, during the idle time; and a third period during which all upper arms or all lower arms, among the arms, are turned on with a third energization pattern, during the idle time. The method includes subtracting, from a first current magnitude or a second current magnitude, a magnitude that is half of a sum of the first current magnitude for a first phase flowing through a current detection unit, which is coupled to a DC side of the inverter, during the first period, and the second current magnitude for the first phase flowing through the current detection unit during the second period, thereby calculating an offset current magnitude for the first phase during the idle time.

An inverter converts power outputted from a distributed power supply into AC power, and outputs to an AC system. An inverter control circuit generates an AC voltage target value at a time of controlling the inverter, and generates a command value for control of the inverter as a voltage source. When the inverter is introduced into the AC system, the inverter control circuit sets a frequency of the AC voltage target value to a frequency of an AC voltage detected by an AC frequency detection circuit, and controls a phase of the AC voltage target value to be at least a leading phase with respect to the AC voltage of the AC system when a target value of the AC power is in a running direction.

An inverter converts power outputted from a distributed power supply into AC power, and outputs to an AC system. An inverter control circuit generates an AC voltage target value at a time of controlling the inverter, and generates a command value for control of the inverter as a voltage source. When the inverter is introduced into the AC system, the inverter control circuit sets a frequency of the AC voltage target value to a frequency of an AC voltage detected by an AC frequency detection circuit, and controls a phase of the AC voltage target value to be at least a leading phase with respect to the AC voltage of the AC system when a target value of the AC power is in a running direction.

A power control apparatus includes a case, a cover attached on the case and a gasket which is attached on a wall of the case below the cover. The gasket includes an intermediate pipe and a seal member which seals between the intermediate pipe and the case. The cover includes a water guide portion extending along the wall of the case. The case includes at least two shielding ribs protruding from the case. The shielding ribs are located below the water guide portion. The shielding ribs include portions located above the seal member to overlap the seal member with respect to a vertical direction. The shielding ribs are located between the water guide portion and the seal member with respect to the vertical direction. Each of the shielding ribs includes an inclined portion in which a one-side portion is located lower than the other-side portion.