Control apparatus for a power supply circuit including plural converter
First Claim
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1. A power supply circuit for a vehicle that supplies electric power to a load, comprising:
- a battery;
a first converter that changes a voltage of the battery and supplies main electric power to the load, a second converter that is connected with the first converter in parallel with regard to the load and changes the voltage of the battery and supplies auxiliary electric power to the load; and
a converter control portion that makes the first converter activate when a switch that operates the load is in the ON state and makes the first converter inactivate and makes the second converter activate when the switch is in the OFF state.
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Abstract
The invention provides a circuit for supplying electric power to a load using a high voltage battery, the circuit supplying a dark current when the load is not being operated. A high voltage load and a low voltage load are attached to a battery and electric power is supplied to the low voltage load through a main DC-DC converter and a sub DC-DC converter. When an ignition switch is OFF, only the sub converter supplies the dark current to the low voltage load and the main DC-DC converter is turned OFF. When the ignition switch is ON, the main DC-DC converter supplies required electric power. Since a low-capacity sub DC-DC converter supplies the dark current, the battery discharge can be prevented.
37 Citations
28 Claims
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1. A power supply circuit for a vehicle that supplies electric power to a load, comprising:
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a battery;
a first converter that changes a voltage of the battery and supplies main electric power to the load, a second converter that is connected with the first converter in parallel with regard to the load and changes the voltage of the battery and supplies auxiliary electric power to the load; and
a converter control portion that makes the first converter activate when a switch that operates the load is in the ON state and makes the first converter inactivate and makes the second converter activate when the switch is in the OFF state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
the converter control portion makes the first converter activate and the second converter inactivate when the switch is in ON state, and makes the first converter inactivate and the second converter activate when the switch is in OFF state.
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3. A power supply circuit according to claim 2, wherein:
the first converter has a larger capacity than the second converter.
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4. A power supply circuit according to claim 2, wherein:
the first converter is deactivated after a predetermined delay after the switch is turned OFF.
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5. A power supply circuit according to claim 1 wherein:
the converter control portion makes the first converter activate and the second converter always inactivate when the switch is in ON state.
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6. A power supply circuit according to claim 5, wherein:
the first converter has a large capacity than the second converter.
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7. A power supply circuit according to claim 5, wherein:
the first converter is deactivated after a predetermined delay after the switch is turned OFF.
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8. A power supply circuit according to claim 1, wherein:
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the load has a first load and a second load;
the first converter supplies the main electric power to the first load; and
the second converter supplies the auxiliary electric power to the second load.
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9. A power supply circuit according to claim 1, wherein:
the switch is an ignition switch of the vehicle.
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10. A power supply circuit according to claim 1, wherein:
the auxiliary electric power is electric power required when the load is not being operated.
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11. A power supply circuit for a vehicle that supplies electric power to a load, comprising:
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a battery;
a first converter that changes a voltage of the battery and supplies main electric power to the load, a second converter that is connected with the first converter in parallel with regard to the load and changes the voltage of the battery and supplies auxiliary electric power to the load, a detector that detects output currents to the load; and
a converter control portion that makes the first converter activate when the output voltage detected by the detector is greater than a predetermined value, and makes the first converter inactivate and the second converter activate when the output voltage detected by the detector is equal to or less than the predetermined value. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
the converter control portion makes the first converter activate and the second converter inactivate when the output voltage detected by the detector is greater than a predetermined value, and makes the first converter inactivate and the second converter activate when the output voltage detected by the detector is equal to or less than the predetermined value.
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13. A power supply circuit according to claim 12, wherein:
the first converter has a larger capacity than the second converter.
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14. A power supply circuit according to claim 12, wherein:
the first converter is deactivated after a predetermined delay after the output voltage detected by the detector is equal to or less than the predetermined value.
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15. A power supply circuit according to claim 11 wherein:
the converter control portion makes the first converter activate and the second converter always inactivate when the output voltage detected by the detector is greater than a predetermined value.
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16. A power supply circuit according to claim 15, wherein:
the first converter has a large capacity than the second converter.
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17. A power supply circuit according to claim 15, wherein:
the first converter is deactivated after a predetermined delay after the output voltage detected by the detector is equal to or less than the predetermined value.
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18. A power supply circuit according to claim 11, wherein:
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the load has a first load and a second load;
the first converter supplies the main electric power to the first load; and
the second converter supplies the auxiliary electric power to the second load.
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19. A power supply circuit according to claim 11, wherein:
the auxiliary electric power is electric power required when the load is not being operated.
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20. A power supply circuit for a vehicle that supplies electric power to a load, comprising:
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a battery;
a first converter that changes a voltage of the battery and supplies main electric power to the load; and
a second converter that is connected with the first converter in parallel with regard to the load and changes the voltage of the battery and supplies auxiliary electric power to the load a converter control portion that makes the first converter activate when the load is active, and makes the first converter inactivate and the second converter activate when the load is inactive. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
the converter control portion makes the first converter activate and the second converter inactivate when the load is active, and makes the first converter inactivate and the second converter activate when the load is inactive.
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22. A power supply circuit according to claim 21, wherein:
the first converter has a larger capacity than the second converter.
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23. A power supply circuit according to claim 21, wherein:
the first converter is deactivated after a predetermined delay after the load is made inactive.
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24. A power supply circuit according to claim 20 wherein:
the converter control portion makes the first converter activate and the second converter always inactivate when the load is active.
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25. A power supply circuit according to claim 24, wherein:
the first converter has a large capacity than the second converter.
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26. A power supply circuit according to claim 24, wherein:
the first converter is deactivated after a predetermined delay after the load is made inactive.
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27. A power supply circuit according to claim 20, wherein:
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the load has a first load and a second load;
the first converter supplies the main electric power to the first load; and
the second converter supplies the auxiliary electric power to the second load.
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28. A power supply circuit according to claim 20, wherein:
the auxiliary electric power is electric power required when the load is inactive.
Specification
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Current AssigneeToyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
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Original AssigneeToyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
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InventorsAbo, Shoji, Okabe, Nobuyuki, Yokoyama, Hidenori
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Primary Examiner(s)BERHANE, ADOLF D
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Application NumberUS09/758,240Publication NumberTime in Patent Office508 DaysField of Search363/65, 323/267, 323/268, 323/271US Class Current363/65CPC Class CodesH02J 2207/20 Charging or discharging cha...H02J 7/1415 with a generator driven by ...H02J 9/005 using a power saving mode f...Y02T 10/70 Energy storage systems for ...Y10T 156/1705 Lamina transferred to base ...Y10T 156/1712 Indefinite or running lengt...
