Battery Charge Controller Sum Current Calculation
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Solution Overview
Problem
Conventional battery charging systems for vehicles cannot drive electrical loads, such as air-conditioner compressors, during charging, leading to prolonged charging times and potential battery life reduction due to abnormal current flow.
Innovation Solution
A battery charging system that includes a battery pack, a vehicle-mounted electrical load, and a battery charge controller that calculates and requests a sum current from an external battery charger for both charging the battery pack and driving the electrical load, ensuring optimal charging even during load operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the inverter is shared between the air-conditioner compressor and the charging socket to reduce weight, then the weight of the power-supply apparatus is reduced, but electrical loads cannot be driven during battery charging
Solution Approach 1:
The power supply system is segmented into two independent power sources: the inverter for driving electrical loads and the external battery charger for charging the battery pack. This segmentation allows both functions to operate simultaneously without interfering with each other, resolving the contradiction between weight reduction and operational versatility.
Solution Approach 2:
The power-supply apparatus is designed to support multiple functions through separate power pathways: the inverter can drive electrical loads while the charging socket accepts external power for battery charging. This multi-functionality enables the system to adapt to different operational scenarios, including simultaneous charging and load operation.
2Adaptability or versatility
If the electrical load is driven during battery charging, then the vehicle can operate electrical equipment, but the charging time is prolonged due to battery power consumption
Solution Approach 1:
The system segments the power flow into two independent channels: external charging power flows directly to the battery pack through the charging socket, while load power is supplied by the inverter. This segmentation prevents load consumption from interfering with charging, eliminating the time loss contradiction.
3Adaptability or versatility
If the electrical load is driven during battery charging, then the vehicle can use electrical equipment, but abnormal current flow may reduce battery life
Solution Approach 1:
The power supply system is divided into separate independent pathways: the inverter supplies power to electrical loads while the external charger supplies power to the battery pack. This segmentation prevents abnormal current interactions between load and charging operations, protecting battery reliability while maintaining operational versatility.
Data Source
AI summary
A battery charging system for a vehicle, capable of charging a vehicle battery pack properly in a short time even during driving a vehicle-mounted electrical load. The battery charging system includes the battery pack mounted in the vehicle, the vehicle-mounted electrical load that can be driven by a current from the battery pack, and a battery charge controller that controls charging of the battery pack. When the battery pack is charged by using an external battery charger during operation of the load, the battery charge controller requires the external battery charger to supply a sum current that is a sum of a current for charging the battery pack and a current for driving the load to the vehicle.