Power supply system
The power supply system addresses inefficiencies in charging multiple vehicle batteries by using a series-parallel switching circuit and control device to equalize charge ratios and supply power to auxiliary equipment, enhancing charging efficiency and power utilization.
JP2026055275APending Publication Date: 2026-03-31TOYOTA JIDOSHA KK
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2026-03-31
AI Technical Summary
Technical Problem
Existing power supply systems for vehicles face inefficiencies in charging multiple batteries due to differences in circuit losses and the need to balance power supply voltage and current, leading to decreased charging efficiency.
Method used
A power supply system with a series-parallel switching circuit and control device that alternates charging processes between batteries, equalizing charge ratios while minimizing losses by connecting batteries in series or parallel, and supplying power to auxiliary equipment during equalization.
Benefits of technology
The system enhances charging efficiency by equalizing charge ratios quickly and effectively utilizing power from generators or external sources, reducing overall charging time and improving power utilization.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure 2026055275000001_ABST
Abstract
This technology improves the efficiency of charging two batteries, which can be connected in series or parallel, using power from an onboard generator or an external power source. [Solution] The power supply system comprises a first battery, a second battery with the same configuration as the first battery, a voltage converter connected to an on-board power generator or external power source, and a series-parallel switching circuit that can switch between a series connection and a parallel connection of the first and second batteries by switching multiple relays on and off. The system performs charge equalization control by alternately performing a first battery charging process that charges only the first battery by switching multiple relays on and off, and a charge ratio equalization process that equalizes the charge ratio of the first battery and the charge ratio of the second battery. During the charge ratio equalization process, power from the power generator or external power source is supplied to the auxiliary equipment and auxiliary batteries.
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Citation Information
Patent Citations
Charging control device of series-parallel cell system
JP2013081316A