A converter is configured for connecting between a solar cell and an inverter configured to convert direct-current power output from the solar cell into alternating current power, and the converter is configured to increase the potential-to-ground at the negative terminal of the solar cell to greater than the potential-to-ground at the negative terminal of the inverter when outputting the direct-current power generated by the solar cell to the inverter side.

One example is an inverter assembly for converting direct current (DC) to alternating current (AC). A DC connector on the inverter assembly is connected to an upper DC bus. A silicon carbide (SiC) heat sink is mounted above the upper DC bus and at least one capacitor is mounted above the SiC heat sink. A lower DC bus is connected to the upper DC bus and a liquid cooled cold-plate cooling unit is positioned between the upper and lower DC busses. SiC half-bridge units are located between the upper DC bus and the cold-plate and between the lower DC bus and the cold-plate. A gate driver unit is located on the upper DC bus above one converter heatsink and another driver located on the lower DC bus below the other converter heatsink. An AC output connector connects the converters to the AC output connecter.

A power conversion circuit board is a board on which a power conversion circuit which converts direct current to alternating current is mounted. A low voltage circuit to which a low voltage is applied and a high voltage circuit to which a high voltage is applied are separately disposed in different areas on the same board surface. Further, in the high voltage circuit, a part of a wiring is formed on the board surface, and another wiring includes a bus bar which is provided with a predetermined distance from the board surface.

A motor driving device includes: brushless DC motor (5) that drives a load that fluctuates during one rotation; and driver (9) that applies a voltage to brushless DC motor (5) and drives brushless DC motor (5). The motor driving device further includes speed accelerator (8) that determines the voltage to be applied by driver (9) so as to accelerate brushless DC motor (5) such that a speed change rate of a speed within one rotation from start of brushless DC motor (5) with respect to a speed at next one rotation remains within a predetermined value or less.

A network feedback unit feeds electrical energy from a voltage intermediate circuit into a three-phase network. The network feedback unit has: a buck converter unit having first and second buck converters, the first buck and second buck converters being connected in parallel with the input side of each electrically coupled to the voltage intermediate circuit; an inverter, with the input side electrically coupled to an output of the buck converter unit and the output side electrically coupled to the three-phase network; at least one filter capacitor arranged at the output of the buck converter unit or at the output of the inverter; and a controller unit to drive the first and second buck converter depending on a filter capacitor current such that the first and second buck converter contribute in equal parts to an output current of the buck converter unit.

In a capacitor device for transferring power between a power source and a target component including an electronic and/or electric component, at least one capacitor is housed in a capacitor case. A busbar is drawn out from the capacitor case. The busbar electrically connects the at least one capacitor to the target component. The capacitor case includes at least first, second, and third fixture members for fixation of the capacitor case. The third fixture member is located to be separated from a virtual line connecting between a first reference point of the first fixture member and a second reference point of the second fixture member, and located to be closer to the target component than the first and second fixture members are. The busbar is located to be closer to the third fixture member than to the virtual line.

In a capacitor device for transferring power between a power source and a target component including an electronic and/or electric component, at least one capacitor is housed in a capacitor case. A busbar is drawn out from the capacitor case. The busbar electrically connects the at least one capacitor to the target component. The capacitor case includes at least first, second, and third fixture members for fixation of the capacitor case. The third fixture member is located to be separated from a virtual line connecting between a first reference point of the first fixture member and a second reference point of the second fixture member, and located to be closer to the target component than the first and second fixture members are. The busbar is located to be closer to the third fixture member than to the virtual line.

Certain aspects of the present disclosure generally relate to methods and apparatus for switching between modes of a multi-mode power supply circuit. One example power supply circuit generally includes a switched-mode power supply (SMPS) circuit, a voltage regulator circuit having an input coupled to an output of the SMPS circuit, the voltage regulator circuit being configured to be selectively enabled, a first voltage divider selectively coupled to the output of the SMPS circuit and selectively coupled to an output of the voltage regulator circuit, and a second voltage divider coupled to the output of the voltage regulator circuit.

Certain aspects of the present disclosure generally relate to methods and apparatus for switching between modes of a multi-mode power supply circuit. One example power supply circuit generally includes a switched-mode power supply (SMPS) circuit, a voltage regulator circuit having an input coupled to an output of the SMPS circuit, the voltage regulator circuit being configured to be selectively enabled, a first voltage divider selectively coupled to the output of the SMPS circuit and selectively coupled to an output of the voltage regulator circuit, and a second voltage divider coupled to the output of the voltage regulator circuit.

A negative-side bus bar 41 includes a capacitor connection portion and first and second negative terminal portions 271 exposed from a resin portion 44 and connected to a DC negative-side terminals 103 of first and second power semiconductor modules 30. A partition portion 252b of a case 252 is provided with a protruding portion 281 that protrudes toward a mold bus bar 40 further than an upper surface 257 of the first and second power semiconductor modules 30 and is thermally coupled to the mold bus bar 40. The projecting portion 281 is disposed between a root portion 275 of an exposed portion where the first negative electrode terminal portion 271 is exposed from the resin portion 44 and a second root portion 275 of an exposed portion where the second negative electrode terminal portion 271 is exposed from the resin portion 44. In this manner, a spatial distance and a creepage distance between the exposed portion from the resin portion of the mold bus bar and the power semiconductor module are made large and the temperature rise of a capacitor is suppressed.