Power converting method and apparatus
First Claim
1. A method of supplying power using a main DC power supply for generating a predetermined voltage to supply a first output voltage substantially equal to the predetermined voltage and a second output voltage lower than the predetermined voltage, comprising the steps of:
- connecting a first DC power supply for generating the same voltage as the second output voltage in series to a second DC power supply for generating a differential voltage between the first output voltage and the voltage from the first DC power supply, thereby forming the main DC power supply, connecting a DC-DC converter to the second DC power supply; and
stepping down the voltage output from the second DC power supply to produce the second output voltage by using the DC-DC converter.
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Accused Products
Abstract
A power converter that can be used in a vehicle equipped with an electrical motor provides power to both the electrical motor and other, auxiliary loads, such as a headlamp, that require a different voltage. The power converter includes a first DC power supply that generates a first voltage equivalent to the voltage required by the auxiliary loads and a second DC power supply, connected in series with the first DC power supply, that generates a differential voltage, where the sum of the differential voltage and the first voltage is the voltage required to drive the electrical motor. A DC-DC converter is connected to the second power supply and converts the differential voltage to the voltage required to drive the auxiliary loads.
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Citations
13 Claims
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1. A method of supplying power using a main DC power supply for generating a predetermined voltage to supply a first output voltage substantially equal to the predetermined voltage and a second output voltage lower than the predetermined voltage, comprising the steps of:
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connecting a first DC power supply for generating the same voltage as the second output voltage in series to a second DC power supply for generating a differential voltage between the first output voltage and the voltage from the first DC power supply, thereby forming the main DC power supply, connecting a DC-DC converter to the second DC power supply; and
stepping down the voltage output from the second DC power supply to produce the second output voltage by using the DC-DC converter.
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2. A power converting apparatus for generating a first output voltage and a second output voltage lower than the first output voltage, comprising:
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a first DC power supply for generating the same voltage as the second output voltage;
a second DC power supply, connected in series to the first DC power supply, for generating a voltage corresponding to a difference between the first output voltage and the voltage from the first DC power supply; and
a DC-DC converter, connected to the second DC power supply, for converting the voltage from the second DC power supply to the second output voltage. - View Dependent Claims (3, 4)
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5. A power converting method of supplying a first output voltage substantially equal to a voltage of a main battery and a second output voltage lower than the voltage of the main battery, comprising the steps of:
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forming the main battery by connecting a first battery for generating the same voltage as the second output voltage in series to a second battery for generating a voltage corresponding to a difference between the first output voltage and the voltage of the first battery;
producing the first output voltage by adding the voltages of the first and second batteries;
connecting a charge power supply for generating a voltage lower than the voltage of the main battery to a step-up DC-DC converter;
stepping up the voltage of the charge power supply using the step-up DC-DC converter to produce a differential voltage between the voltage of the main battery and the voltage of the charge power supply; and
charging the main battery with a sum of the differential voltage and the voltage of the charge power supply.
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6. A power converting apparatus for generating a first DC voltage and a second DC voltage lower than the first DC voltage, comprising:
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a first battery for generating the same voltage as the second DC voltage;
a second battery, connected in series to the first battery, for generating a differential voltage between the first DC voltage and the voltage of the first battery; and
a polarity-inverting type DC-DC converter having an input connected to the second battery and an output connected to the first battery, the DC-DC converter including a first switching element and a first diode connected in parallel to each other, a second switching element connected between the output of the DC-DC converter and the first battery, and a second diode connected in parallel to the second switching element. - View Dependent Claims (7)
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8. A power converting apparatus for a motor driven vehicle, comprising:
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a main battery assembly, connected between a high-potential power supply and a low-potential power supply, for generating a main output voltage for driving the vehicle motor, the main battery assembly including a first battery cell for generating a first voltage lower than the main output voltage, and a second battery cell, connected in series to the first battery cell, for generating a second voltage corresponding to a difference between the main output voltage and the first voltage; and
a DC-DC converter, connected to the second battery cell, for converting the second voltage to a low voltage substantially equal to the first voltage. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification