# US 10,483,777 B2 · Auxiliary power supply device and power supply system

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- Number: US 10,483,777 B2
- Document ID: US10483777B2
- Status: Granted
- Kind: B2
- Application number: 15/867,857
- Filed: 2018-01-11
- Published: 2018-07-19
- Granted: 2019-11-19
- Earliest claimed: 2017-01-17
- Assignees: Jtekt Corporation; Toyota Jidosha Kabushiki Kaisha
- Applicants: Jtekt Corporation; Toyota Jidosha Kabushiki Kaisha
- Inventors: Fumihiko Satou; Toyoki Sugiyama; Masataka Okuda; Hidefumi Kamikawa
- Web page: https://patentgrep.com/patent/US10483777B2

## CPC

- H02J 7/00: Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- B60R 16/02: electric {constitutive elements}
- B62D 5/046: {Controlling the motor}
- B62D 5/06: fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- H02J 7/345: {using capacitors as storage or buffering devices}
- H02J 7/865: {Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence)}
- H02J 9/061: {for DC powered loads}
- H02J 9/068: {Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection}
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M)

## Abstract

An auxiliary power supply device includes: a plurality of channels of auxiliary power supplies; a charging circuit; and an auxiliary power supply switching circuit disposed between the charging circuit and positive electrode terminals of the plurality of channels of auxiliary power supplies and configured to switch one channel of auxiliary power supply connected to the charging circuit among the plurality of channels of auxiliary power supplies and to simultaneously switch one channel of auxiliary power supply connected to a power supply destination so as not to match the channel of auxiliary power supply connected to the charging circuit.

## Claims

### Claim 1

An auxiliary power supply device comprising:
a plurality of channels of auxiliary power supplies;
a charging circuit configured to charge the auxiliary power supplies, the charging circuit being connected to a main power supply; and
an auxiliary power supply switching circuit disposed between the charging circuit and positive electrode terminals of the plurality of channels of auxiliary power supplies and configured to switch one channel of auxiliary power supply connected to the charging circuit among the plurality of channels of auxiliary power supplies such that one auxiliary power supply that has been disconnected from the charging circuit is connected to the charging circuit and another auxiliary power supply that has been connected to the charging circuit is disconnected from the charging circuit, and to simultaneously switch one channel of auxiliary power supply connected to a power supply destination such that one auxiliary power supply that has been disconnected from the power supply destination is connected to the power supply destination, another auxiliary power supply that has been connected to the power supply destination is disconnected from the power supply destination, and the one channel of auxiliary power supply connected to the power supply destination does not match the one channel of auxiliary power supply connected to the charging circuit.

### Claim 2 (depends on 1)

The auxiliary power supply device according to claim 1, wherein:
the plurality of channels of auxiliary power supplies include a first auxiliary power supply and a second auxiliary power supply; and
the auxiliary power supply switching circuit is configured to switch a state of the first auxiliary power supply and the second auxiliary power supply between a first state and a second state;
in the first state, the first auxiliary power supply is connected to the charging circuit, the second auxiliary power supply is not connected to the charging circuit, the second auxiliary power supply is connected to the power supply destination, and the first auxiliary power supply is not connected to the power supply destination; and
in the second state, the first auxiliary power supply is connected to the power supply destination, the second auxiliary power supply is not connected to the power supply destination, the second auxiliary power supply is connected to the charging circuit, and the first auxiliary power supply is not connected to the charging circuit.

### Claim 3 (depends on 2)

A power supply system comprising:
the auxiliary power supply device according to claim 2;
a first voltage detector configured to detect a first voltage which is an inter-terminal voltage of the first auxiliary power supply;
a second voltage detector configured to detect a second voltage which is an inter-terminal voltage of the second auxiliary power supply; and
a control device configured to control the auxiliary power supply device,
wherein the control device is configured to switch the auxiliary power supply switching circuit to the second state when the auxiliary power supply switching circuit is in the first state and the second voltage detected by the second voltage detector decreases to a value less than a predetermined first threshold value, and to switch the auxiliary power supply switching circuit to the first state when the auxiliary power supply switching circuit is in the second state and the first voltage detected by the first voltage detector decreases to a value less than the predetermined first threshold value.

### Claim 4 (depends on 3)

The power supply system according to claim 3, wherein the control device controls the charging circuit such that the first auxiliary power supply is charged only when the auxiliary power supply switching circuit is in the first state and the first voltage detected by the first voltage detector is less than a predetermined second threshold value and controls the charging circuit such that the second auxiliary power supply is charged only when the auxiliary power supply switching circuit is in the second state and the second voltage detected by the second voltage detector is less than the second threshold value.