US5350994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric system for an electric vehicle
Assignee: Fuji Electric Co Ltd
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Filing: 1993-06-03
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Granted: 1994-09-27
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Expires: 2013-06-03
Abstract
Abstract An electric system for an electric vehicle includes a main battery used for driving the vehicle, an auxiliary battery used for accessories of the vehicle, an AC motor for driving one or more wheels, an inverter for converting DC power supplied from the main battery to AC power to be supplied to the AC motor, and an auxiliary battery charging circuit for charging the auxiliary battery by using the AC power from the inverter. When charging the auxiliary battery, the AC power is insulatedly transformed and then rectified. In another example, an input capacitor in the inverter is charged by a DC-DC converter connected with the auxiliary battery as its power supply when the inverter starts. The system enables the auxiliary battery charging circuit to be small, light and low cost. The system can also charge the auxiliary battery for accessories even when the vehicle is stopping.
Inventors
- 👤 Shigenori Kinoshita
- 👤 Takao Yanase
- 👤 Kouetsu Fujita
- 👤 Osamu Motoyoshi
- 👤 Yoshio Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:15
CPC Classifications
B; B60; B60L; B60L50/00; B60L50/50; B60L50/51; B60L53/00; B60L53/20; B60L58/00; B60L58/10; B60L58/18; B60L58/20; H; H02; H02J; H02J7/00; H02J7/02; B60L2210/00; B60L2210/10; H02J2207/00; H02J2207/20; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/70; Y02T10/7072; Y02T10/72; Y02T10/80; Y02T10/92; Y02T90/00; Y02T90/10; Y02T90/12; Y02T90/14
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
172 words
An electric system for an electric vehicle comprising: a main battery used for driving the vehicle, said main battery having a plurality of unit batteries and providing a first voltage; an auxiliary battery used for accessories of the vehicle, said auxiliary battery having the same kind of unit battery as said main battery and providing a second voltage, said first voltage being n times said voltage; an AC motor for driving one or more wheels of the vehicle; an inverter for converting DC power supplied from said main battery to AC power for supply to said AC motor; and charging means for charging said auxiliary battery by using the AC power from said inverter, said charging means for the auxiliary battery comprising a step-down insulating transformer for reducing the output voltage of said inverter to the charging voltage of said auxiliary battery, a rectifier and a smoothing circuit which are in turn connected to an AC output side of said inverter, wherein a turns ratio of said step-down insulating transformer is n.
Claim 2
Dependent Claim
172 words
An electric system for an electric vehicle comprising: a main battery used for driving the vehicle, said main battery having a plurality of unit batteries and providing a first voltage; an auxiliary battery used for accessories of the vehicle, said auxiliary battery having the same kind of unit battery as said main battery and providing a second voltage, said first voltage being n times said voltage; an AC motor for driving one or more wheels of the vehicle; an inverter for converting DC power supplied from said main battery to AC power for supply to said AC motor; and charging means for charging said auxiliary battery by using the AC power from said inverter, said charging means for the auxiliary battery comprising a step-down insulating transformer for reducing the output voltage of said inverter to the charging voltage of said auxiliary battery, a rectifier and a smoothing circuit which are in turn connected to an AC output side of said inverter, wherein a turns ratio of said step-down insulating transformer is n.
Claim 3
Dependent Claim
31 words
An electric system for an electric vehicle as claimed in claim 1, wherein a number of phases of said insulating transformer and said rectifier is equal to that of said inverter.
Claim 4
Dependent Claim
22 words
An electric system for an electric vehicle as claimed in claim 1, wherein said insulating transformer and said rectifier are of single-phase.
Claim 5
Dependent Claim
31 words
An electric system for an electric vehicle as claimed in claim 3, wherein said inverter is of three-phase and only two phases of three are operated to charge said auxiliary battery.
Claim 6
Dependent Claim
49 words
An electric system for an electric vehicle as claimed in claim 1, further comprising a DC-DC converter to which DC power is supplied from said auxiliary battery and an input capacitor in said inverter, said DC-DC converter initially charging said input capacitor in said inverter when said inverter starts.
Claim 7
Dependent Claim
31 words
An electric system for an electric vehicle as claimed in claim 5, wherein a number of phases of said insulating transformer and said rectifier is equal to that of said inverter.
Claim 8
Dependent Claim
22 words
An electric system for an electric vehicle as claimed in claim 6, wherein said insulating transformer and said rectifier are of single-phase.
Claim 9
Dependent Claim
32 words
An electric system for an electric vehicle as claimed in claim 6, wherein said inverter is of three-phase and only two phases of the three are operated to charge said auxiliary battery.
Claim 10
Dependent Claim
126 words
An electric system for an electric vehicle comprising: a main battery used for driving the vehicle; an auxiliary battery used for accessories of the vehicle; an AC motor for driving one or more wheels of the vehicle; an inverter for converting DC power supplied from said main battery to AC power for supply to said AC motor; and charging means for charging said auxiliary battery by using a phase voltage of the AC power from said inverter, the charging means comprising, an insulating transformer having a primary side connected to a terminal of the AC power side of said inverter and a middle terminal of said main battery; a rectifier connected with the secondary side of said transformer; and a smoothing circuit connected with said rectifier.
Claim 11
Dependent Claim
126 words
An electric system for an electric vehicle comprising: a main battery used for driving the vehicle; an auxiliary battery used for accessories of the vehicle; an AC motor for driving one or more wheels of the vehicle; an inverter for converting DC power supplied from said main battery to AC power for supply to said AC motor; and charging means for charging said auxiliary battery by using a phase voltage of the AC power from said inverter, the charging means comprising, an insulating transformer having a primary side connected to a terminal of the AC power side of said inverter and a middle terminal of said main battery; a rectifier connected with the secondary side of said transformer; and a smoothing circuit connected with said rectifier.
Claim 12
Dependent Claim
40 words
An electric system for an electric vehicle as claimed in claim 9, wherein one phase of said inverter having a terminal connected with said charging means is operated to charge said auxiliary battery when said AC motor does not operate.
Claim 13
Dependent Claim
53 words
An electric system for an electric vehicle as claimed in claim 9, wherein said main battery and said auxiliary battery have the same kind of unit battery, and a turns ratio of said insulating transformer is n/2 when the voltage of said main battery is n times the voltage of said auxiliary battery.
Claim 14
Dependent Claim
53 words
An electric system for an electric vehicle as claimed in claim 10, wherein said main battery and said auxiliary battery have the same kind of unit battery, and a turns ratio of said insulating transformer is n/2 when the voltage of said main battery is n times the voltage of said auxiliary battery.
Claim 15
Dependent Claim
107 words
An electric system for an electric vehicle, comprising: a main battery used for driving the vehicle; an auxiliary battery used for accessories of the vehicle; an AC motor for driving one or more wheels of the vehicle; an inverter for converting DC power supplied from said main battery to AC power for supply to the AC motor, the inverter having an input capacitor; charging means for charging the auxiliary battery by using the AC power from the inverter; and a DC-DC converter to which DC power is supplied from the auxiliary battery, said DC-DC converter initially charging the input capacitor in the inverter when the inverter starts.
Claim 16
Dependent Claim
107 words
An electric system for an electric vehicle, comprising: a main battery used for driving the vehicle; an auxiliary battery used for accessories of the vehicle; an AC motor for driving one or more wheels of the vehicle; an inverter for converting DC power supplied from said main battery to AC power for supply to the AC motor, the inverter having an input capacitor; charging means for charging the auxiliary battery by using the AC power from the inverter; and a DC-DC converter to which DC power is supplied from the auxiliary battery, said DC-DC converter initially charging the input capacitor in the inverter when the inverter starts.
Claim 17
Dependent Claim
30 words
An electric system for an electric vehicle according to claim 13, wherein a number of phases of the insulating transformer and the rectifier is equal to that of the inverter.
Claim 18
Dependent Claim
22 words
An electric system for an electric vehicle according to claim 14, wherein the insulating transformer and the rectifier are of single phase.
Claim 19
Dependent Claim
30 words
An electric system for an electric vehicle according to claim 14, wherein the inverter is of three-phase and only two phases of three are operated to charge the auxiliary battery.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-09-26 | 1998-03-28 | 1998-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-26 | 2002-03-28 | 2002-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-26 | 2006-03-28 | 2006-09-27 | $7700.00 | Window Closed / Lapsed |