Power supply apparatus and electric vehicle using the same
First Claim
1. A power supply apparatus for a vehicle, comprising:
- a first battery unit;
a second battery unit for a lower voltage than said first battery unit;
an inverter circuit which inputs a voltage from said first battery unit through switches;
a smoothing condenser provided between said first battery unit and said inverter circuit in parallel;
a DC-DC converter provided between said smoothing condenser and said second battery unit to voltage-convert electric energy stored in said first battery unit or said smoothing condenser to supply to said second battery unit, and to voltage-convert electric energy stored in said second battery unit to supply to said smoothing condenser;
an electronic control unit which controls said DC-DC converter before starting power supply to said inverter circuit, such that said switches are closed after said smoothing condenser is charged to a voltage within a predetermined permission voltage range from the voltage of said first battery unit;
wherein said DC-DC converter comprises;
a voltage decreasing switching circuit connected with said smoothing condenser;
a voltage increasing switching circuit connected with said second battery unit; and
a transformer provided between said voltage decreasing switching circuit and said voltage increasing switching circuit, and said voltage increasing switching circuit is driven by said electronic control unit to carry out a switching operation such that the voltage from said second battery unit is boosted and supplied to said smoothing condenser, and said voltage decreasing switching circuit is driven by said electronic control unit to carry out a switching operation such that the voltage supplied through said switches from said first battery unit is decreased and supplied to said second battery unit;
wherein said electronic control unit stops the switching operation of said voltage increasing switching circuit, when the voltage applied to said smoothing condenser is higher than an output voltage of said first battery unit, and operates said voltage decreasing switching circuit.
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Accused Products
Abstract
In a power supply apparatus for a vehicle, an inverter circuit inputs a voltage from a first battery unit through switches. A smoothing condenser is provided between the first battery unit and the inverter circuit in parallel. A DC-DC converter is provided between the smoothing condenser and a second battery unit to voltage-convert electric energy stored in the first battery unit or the smoothing condenser to supply to the second battery unit, and to voltage-convert electric energy stored in the second battery unit to supply to the smoothing condenser. An electronic control unit controls the DC-DC converter before starting power supply to the inverter circuit, such that the switches are closed after the smoothing condenser is charged to a voltage within a predetermined permission voltage range from the voltage of the first battery unit.
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Citations
21 Claims
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1. A power supply apparatus for a vehicle, comprising:
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a first battery unit;
a second battery unit for a lower voltage than said first battery unit;
an inverter circuit which inputs a voltage from said first battery unit through switches;
a smoothing condenser provided between said first battery unit and said inverter circuit in parallel;
a DC-DC converter provided between said smoothing condenser and said second battery unit to voltage-convert electric energy stored in said first battery unit or said smoothing condenser to supply to said second battery unit, and to voltage-convert electric energy stored in said second battery unit to supply to said smoothing condenser;
an electronic control unit which controls said DC-DC converter before starting power supply to said inverter circuit, such that said switches are closed after said smoothing condenser is charged to a voltage within a predetermined permission voltage range from the voltage of said first battery unit;
wherein said DC-DC converter comprises;
a voltage decreasing switching circuit connected with said smoothing condenser;
a voltage increasing switching circuit connected with said second battery unit; and
a transformer provided between said voltage decreasing switching circuit and said voltage increasing switching circuit, and said voltage increasing switching circuit is driven by said electronic control unit to carry out a switching operation such that the voltage from said second battery unit is boosted and supplied to said smoothing condenser, and said voltage decreasing switching circuit is driven by said electronic control unit to carry out a switching operation such that the voltage supplied through said switches from said first battery unit is decreased and supplied to said second battery unit;
wherein said electronic control unit stops the switching operation of said voltage increasing switching circuit, when the voltage applied to said smoothing condenser is higher than an output voltage of said first battery unit, and operates said voltage decreasing switching circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An automobile, comprising:
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a first battery unit for a higher DC voltage power;
a second battery unit for a lower DC voltage power;
a smoothing condenser selectively connected with said first battery unit, and provided to supply power obtained from the high DC voltage power of said first battery unit to a motor in a steady state in which said automobile is driven with the power; and
a DC-DC converter connected with said smoothing condenser and said second battery unit, and provided to charge said smoothing condenser using the lower DC voltage power of said second battery unit in an initial precharging state prior to the steady states wherein said DC-DC converter comprises;
a transformer provided;
a voltage decreasing switching circuit provided between said smoothing condenser and said transformer, to rectify first input power from said transformer in case of no control signal and to carry out a first switching operation to second input power from said smoothing condenser in response to a voltage decreasing control signal to decrease an output voltage; and
a voltage increasing switching circuit provided between said second battery unit and said transformer, to rectify third input power from said transformer in case of no control signal and to carry out a second switching operation to fourth input power from said second battery unit in response to a voltage increasing control signal to increase an output voltage;
wherein said automobile further comprises an electronic control unit which issues said voltage increasing control signal to said voltage increasing switching circuit in the initial charging operation, when the charged voltage of said smoothing condenser is equal to or lower than a first threshold voltage. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification