A power control unit installed on a vehicle including a first power source and a second power source which have respective different voltages, an inverter connected to a rotary device and connected to at least one of the first and second power sources. A converter is connected to the first and secon
A power control unit installed on a vehicle including a first power source and a second power source which have respective different voltages, an inverter connected to a rotary device and connected to at least one of the first and second power sources. A converter is connected to the first and second power sources. A casing is formed of an electrically conductive material and has a grounding terminal formed thereon, wherein the inverter and the converter are accommodated within the casing, and are connected to the grounding terminal through said casing.
대표청구항▼
What is claimed is: 1. A power control unit that is installed on a vehicle including (a) a first power source and (b) a second power source which have respective different voltages, (c) an inverter to be connected to a rotary device and at least one of said first and second power sources, and (d) a
What is claimed is: 1. A power control unit that is installed on a vehicle including (a) a first power source and (b) a second power source which have respective different voltages, (c) an inverter to be connected to a rotary device and at least one of said first and second power sources, and (d) a converter to be connected to said first and second power sources, said power control unit comprising: a casing formed of an electrically conductive material and having a grounding terminal formed thereon, wherein said inverter and said converter are accommodated within said casing, and connected to said grounding terminal through said casing. 2. A power control unit according to claim 1, wherein said grounding terminal is formed integrally with said casing. 3. A power control unit according to claim 1, wherein said converter is located below said inverter within said casing. 4. A power control unit according to claim 1, further comprising a cooling device provided between said inverter and said converter. 5. A power control unit according to claim 1, wherein said grounding terminal is formed on an upper surface of said casing. 6. A power control unit according to claim 1, wherein said casing comprises: a first casing member having said grounding terminal; and a second casing member, wherein: at least one of said inverter and said converter is connected to said second casing member; and said first and second casings members are fixed and electrically connected to each other. 7. A power control unit according to claim 6, wherein said inverter is connected to said first casing member, and said converter is connected to said second casing member. 8. A power control unit according to claim 6, wherein said first and second casing members are electrically connected to each other through a bus bar fixed to outer surfaces of said first and second casing members. 9. A power control unit according to claim 6, wherein each of said first and second casing members has a sealing portion and a metallic contactor portion at a junction between the first and second casing members. 10. A power control unit according to claim 1, wherein windings of said rotary device and said inverter are connected to each other through power wires, and terminal portions to which said power wires are connected are disposed on an upper surface of said casing. 11. A power control unit according to claim 10, wherein said terminal portions project from said upper surface of said casing, and then extend laterally of said casing. 12. A power control unit according to claim 11, wherein said casing includes of a main body portion and an upper casing portion which is removably fixed to said main body portion in a direction perpendicular to said upper surface, and said upper casing portion includes an upper wall having an opening which permits said terminal portions to pass therethrough when said upper casing portion is fixed and removed to and from said main body portion. 13. A power control unit according to claim 12, further comprising a terminal support plate which is disposed on the upper surface of said upper casing portion such that said terminal support plate normally supports said terminal portions and extends across said opening, said terminal support plate being slidably movable on the upper surface of said upper casing portion laterally of said upper casing portion. 14. A power control unit according to claim 13, wherein said terminal support plate is dimensioned to close said opening. 15. A power control unit according to claim 10, wherein said rotary device is a three-phase AC motor/generator, and said terminal portions comprise terminal portions corresponding to respective coil windings of three phases of said motor/generator. 16. A power control unit according to claim 10, further comprising a cover member fixed to said casing, said cover member including a portion which extends over and covers said terminal portions, said cover member having a projection and a recess for positioning said cover member relative to said casing. 17. A power control unit according to claim 1, wherein said casing is installed within an engine compartment of the vehicle. 18. A power control unit according to claim 17, wherein said casing is dimensioned such that said casing can be disposed on a battery tray located in said engine compartment. 19. A power control unit according to claim 18, wherein said first power source is a DC power source having a nominal voltage of 12V, and said second power source is a DC power source having a nominal voltage higher than 12V, and said casing has a positive terminal of said first power source fixed thereto. 20. A power control unit according to claim 17, wherein said casing is disposed in a portion of the engine compartment of the vehicle, which is near a passenger compartment of the vehicle. 21. A power control unit according to claim 1, further comprising a one-piece casing fixed to said casing, and connectors to be respectively connected to a plurality of components installed on the vehicle, and wherein said connectors are accommodated within said one-piece casing. 22. A power control unit according to claim 21, wherein said one-piece casing is removably fixed to said casing. 23. A power control unit according to claim 21, wherein the operating voltages of said plurality of components are different and said connectors to be connected to said components having the same operating voltage are accommodated within said one-piece casing. 24. A power control unit for a vehicle, which is electrically connected to a first power source having a nominal voltage of 12V and a second power source having a nominal voltage of 36V, comprising: a casing; an inverter accommodated within said casing; a converter accommodated within said casing; a first electric wire connecting at least one of said inverter and said converter to said first power source having a nominal voltage of 12V; and a second electric wire connecting at least one of said inverter and said converter to said second power source having a nominal voltage of 36V, wherein said first and second electric wires have respective outer coatings having respective different colors, the outer coating of said second electric wire is a yellow color. 25. A power control unit according to claim 24, wherein the outer coating of the second electric wire is a bright yellow color.
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