# US 12,191,704 B2 · Vehicle power management system and operation method thereof

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- Number: US 12,191,704 B2
- Document ID: US12191704B2
- Status: Granted
- Kind: B2
- Application number: 18/180,808
- Filed: 2023-03-08
- Published: 2024-05-02
- Granted: 2025-01-07
- Earliest claimed: 2022-10-28
- Assignees: Getac Technology Corporation
- Applicants: Getac Technology Corporation
- Inventors: Yung-Le Hung; Cheng-Liang Huang
- Web page: https://patentgrep.com/patent/US12191704B2

## CPC

- H02J 7/342: {The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging (with circuits for polarity protection H02J7/68)}
- B60L 3/0046: {relating to electric energy storage systems, e.g. batteries or capacitors}
- B60R 16/03: for supply of electrical power to vehicle subsystems {or for (circuit arrangements for charging batteries H02J7/00)}
- B60R 16/033: characterised by the use of electrical cells or batteries (for propulsion puposes B60K1/04; supplying batteries to, or removing batteries from, vehicles B60S5/06; testing of charge state G01R31/36)
- H02J 7/80: including monitoring or indicating arrangements
- H02J 7/933: {the cycle being controlled or terminated in response to electric parameters}
- H02J 9/061: {for DC powered loads}
- H02J 7/575: {Parallel/serial switching of connection of batteries to charge or load circuit}
- H02J 7/90: Regulation of charging or discharging current or voltage
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR

## Abstract

A vehicle power management system and an operating method thereof are provided. The vehicle power management system is adapted for a vehicle load device and a vehicle power supply, and includes a control circuit, a charge/discharge circuit and a backup battery. The control circuit is electrically connected to the vehicle power supply and the vehicle load device, and monitors an output voltage of the vehicle power supply and determines according to the output voltage whether a vehicle engine is started. The charge/discharge circuit is electrically connected to the control circuit and the backup battery. When the vehicle engine is started, the charge/discharge circuit supplies power of the vehicle power supply to the backup battery and the vehicle load device. When the vehicle engine is not started, the backup battery discharges the charge/discharge circuit and the charge/discharge circuit supplies power of the backup battery to the vehicle load device.

## Claims

### Claim 1

A vehicle power management system, adapted for a vehicle load device and a vehicle power supply, the vehicle power management system comprising:
a control circuit, electrically connected to the vehicle power supply and the vehicle load device, the control circuit monitoring an output voltage of the vehicle power supply and determining according to the output voltage whether a vehicle engine is started;
a charge/discharge circuit, electrically connected to the control circuit and the vehicle load device; and
a backup battery, electrically connected to the charge/discharge circuit;
wherein, when the vehicle engine is started, the charge/discharge circuit supplies power of the vehicle power supply to the backup battery and the vehicle load device;
wherein, when the vehicle engine is not started, the charge/discharge circuit supplies power of the backup battery to the vehicle load device;
wherein, when the vehicle engine is started and the control circuit monitors that a power loss of the vehicle load device is greater than or equal to a power threshold, the charge/discharge circuit supplies the power of the backup battery to the vehicle load device;
wherein, when the vehicle engine is started and the control circuit monitors that the power loss of the vehicle load device is smaller than the power threshold, the charge/discharge circuit supplies the power of the vehicle power supply to the backup battery and the vehicle load device.

### Claim 2 (depends on 1)

The vehicle power management system according to claim 1, further comprising:
a first switch circuit, electrically connected to the control circuit, the charge/discharge circuit and the vehicle power supply;
wherein, the control circuit causes the first switch circuit to be in an on state when the vehicle engine is started, and causes the first switch circuit to be in an off state when the vehicle engine is not started.

### Claim 3 (depends on 2)

The vehicle power management system according to claim 2, wherein the control circuit is set with an allowed input voltage range and a voltage threshold, and the voltage threshold is within the allowed input voltage range; when the output voltage of the vehicle power supply is within the allowed input voltage range and is greater than or equal to the voltage threshold, the control circuit causes the first switch circuit to be in the on state; when the output voltage of the vehicle power supply is not within the allowed input voltage range or is smaller than the voltage threshold, the control circuit causes the first switch circuit to be in the off state.

### Claim 4 (depends on 2)

The vehicle power management system according to claim 2, further comprising:
a second switch circuit, electrically connected to the charge/discharge circuit, the control circuit and the vehicle load device;
wherein, the control circuit is further set with an allowed output voltage range; the control circuit causes the second switch circuit to be in an on state when an output voltage of the charge/discharge circuit is within the allowed output voltage range, and causes the second switch circuit to be in an off state when the output voltage of the charge/discharge circuit is not within the allowed output voltage range.

### Claim 5

An operating method of a vehicle power management system, the operating method comprising:
monitoring an output voltage of a vehicle power supply by a control circuit;
determining according to the output voltage by the control circuit whether a vehicle engine is started;
supplying power of the vehicle power supply to a backup battery and a vehicle load device by a charge/discharge circuit when the vehicle engine is started;
supplying power of the backup battery to the vehicle load device by the charge/discharge circuit when the vehicle engine is not started;
supplying the power of the backup battery to the vehicle load device by the charge/discharge circuit when the vehicle engine is started and the control circuit monitors that a power loss of the vehicle load device is greater than or equal to a power threshold; and
supplying the power of the vehicle power supply to the backup battery and the vehicle load device by the charge/discharge circuit when the vehicle engine is started and the control circuit monitors that the power loss of the vehicle load device is smaller than the power threshold.

### Claim 6 (depends on 5)

The operating method of the vehicle power management system according to claim 5, further comprising:
before supplying the power of the vehicle power supply to the backup battery and the vehicle load device by the charge/discharge circuit, causing a first switch circuit connected between the vehicle power supply and the charge/discharge circuit to be in an on state by the control circuit.

### Claim 7 (depends on 5)

The operating method of the vehicle power management system according to claim 5, further comprising:
before supplying the power of the backup battery to the vehicle load device by the charge/discharge circuit, causing a first switch circuit connected between the vehicle power supply and the charge/discharge circuit to be in an off state by the control circuit.

### Claim 8 (depends on 5)

The operating method of the vehicle power management system according to claim 5, further comprising:
determining by the control circuit whether the output voltage of the vehicle power supply is within an allowed voltage range;
determining by the control circuit whether the output voltage of the vehicle power supply is greater than or equal to a voltage threshold when the output voltage of the vehicle power supply is within the allowed voltage range;
causing a first switch circuit connected between the vehicle power supply and the charge/discharge circuit to be in an on state by the control circuit when the output voltage of the vehicle power supply is greater than or equal to the voltage threshold; and
causing the first switch circuit to be in an off state by the control circuit when the output voltage of the vehicle power supply is not within the allowed voltage range or is smaller than the voltage threshold.

### Claim 9 (depends on 8)

The operating method of the vehicle power management system according to claim 8, further comprising:
determining by the control circuit whether an output voltage of the charge/discharge circuit is within an allowed output voltage range;
when the output voltage of the charge/discharge circuit is within the allowed output voltage range, causing a second switch circuit connected between the charge/discharge circuit and the vehicle load device to be in an on state by the control circuit; and
when the output voltage of the charge/discharge circuit is not within the allowed voltage range, causing the second switch circuit to be in an off state by the control circuit.