Multi-Battery Switch Circuit for Series-Parallel Voltage Control
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Solution Overview
Problem
The existing power supply systems for vehicles with multiple batteries require separate controllers for each battery, leading to increased cost and installation space, and there is a need for efficient voltage application to both a traveling motor and auxiliary machines without causing these issues.
Innovation Solution
A power supply device with a switch circuit and control device that switches between parallel and series connections of multiple power supplies to optimize voltage application to electric loads, using a switch circuit with five switches and reactors to manage voltage distribution efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate controllers are used for each battery in a multi-battery power supply system, then appropriate voltage control for different loads is achieved, but cost and installation space increase
Solution Approach 1:
The patent combines multiple control functions into a single controller that manages both the first and second batteries. The controller includes a switch circuit with multiple switches that can connect either battery to different loads based on voltage requirements, eliminating the need for separate controllers for each battery system.
Solution Approach 2:
The single controller is designed with multi-functionality to handle both high-voltage and low-voltage power supply tasks. It can selectively connect the first battery (higher voltage) or the second battery (lower voltage) to different loads based on their specific voltage requirements, making one controller perform the work of multiple specialized controllers.
2Adaptability or versatility
If multiple batteries with different voltages are used to supply different loads, then appropriate voltage application is achieved, but system complexity increases
Solution Approach 1:
The system employs dynamic switching control where the controller continuously monitors battery voltages and load requirements, then adjusts the switch circuit configuration in real-time. The switches are dynamically opened or closed based on current operating conditions to optimize voltage matching between batteries and loads.
Solution Approach 2:
The switch circuit acts as an intermediary mechanism between the multi-voltage battery system and the loads. It mediates the voltage mismatch by selectively connecting appropriate batteries to appropriate loads through controlled switching, enabling voltage adaptation without modifying the batteries or loads themselves.
3Device complexity
If a single controller manages multiple batteries, then cost and installation space are reduced, but control complexity increases
Solution Approach 1:
The controller's switching control logic is segmented into distinct control paths for different scenarios. The control program separately handles high-voltage mode (connecting first battery to inverter), low-voltage mode (connecting second battery to auxiliary loads), and battery charging modes, making the complex control logic more manageable and implementable.
Solution Approach 2:
The controller automatically detects battery voltages and load requirements, then autonomously determines the optimal switching configuration without external intervention. The system self-manages the complexity by implementing built-in voltage detection and automatic decision-making logic that selects appropriate battery-load connections based on real-time conditions.
Data Source
AI summary
A power supply device includes: a switch circuit that includes a first power supply, a second power supply, and first to fifth switching elements; and a control device that switches between a parallel state in which the first power supply and the second power supply are connected in parallel to an inverter and the first power supply or the second power supply is connected to an auxiliary machine and a series state in which the first power supply and the second power supply are connected in series to the inverter and one of the first power supply and the second power supply is connected to the auxiliary machine by controlling the switch circuit.