3results about How to "Reduce surge voltage" patented technology

The invention provides an electric compressor capable of uniformizing loss and heat generation of a switching element and coping with a wide range without enlarging the size. An electric compressor (1) is provided with an inverter (16) that has a plurality of switching elements (18A-18F) and supplies power to a motor (8). An electric compressor (1) is provided with: a housing (2) that constitutes a motor chamber (4) in which a motor is incorporated, and an inverter housing section (6) in which an inverter is mounted; a partition wall (3) between the motor chamber and the inverter housing part; and a plurality of connection terminals (10A, 10B), one end of which is electrically connected to the motor, the connection terminals being provided so as to protrude from the motor in the direction of the partition wall, the connection terminals being provided so as to be dispersed and pass through the partition wall, and the other end of which is electrically connected to the inverter. The switching elements are arranged on the partition walls in a dispersed manner so as to correspond to the respective connection terminals.

The present disclosure provides a semiconductor module that reduces a surge voltage at the time of turning off a switching element. Having: a first frame that is connected to a lower surface electrode of the first semiconductor chip, has a first terminal that protrudes from the semiconductor module; a second frame that is connected to an upper surface electrode of the second semiconductor chip, has a second terminal that protrudes from the semiconductor module; a third frame that is connected to an upper surface electrode of the first semiconductor chip and a lower surface electrode of the second semiconductor chip, has a third terminal that protrudes from the semiconductor module; a fourth terminal and a fifth terminal that are connected to gate electrodes of the first semiconductor chip and the second semiconductor chip and protrude from the semiconductor module, the semiconductor module having at least one of a first relative portion of the second frame and the third frame that is arranged in parallel with respect to a flow direction of a current, and a second relative portion of the first frame on one of the adjacent semiconductor chip groups and the second frame on the other semiconductor chip group that is arranged in parallel with respect to the flow direction of the current.

The application discloses a power board, a motor driver and a brushless direct current motor driving system, and relates to the technical field of motor drivers, and aims at solving the problem that the motor driver is large in size and weight and cannot meet the requirements of the fields of aviation and spaceflight. The power board comprises a negative electrode connecting terminal, a three-phase inverter assembly and a current sensor assembly which are uniformly surrounded by the negative electrode connecting terminal. The motor driver comprises the power board provided in the technical scheme. The power board, the motor driver and the brushless direct current motor driving system are used for driving a brushless direct current motor.