Electric Vehicle Control Device Voltage Regulation
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Solution Overview
Problem
The existing electric vehicle control devices require complex and expensive configurations to manage communication between controllers for battery recharging, leading to increased complexity and cost.
Innovation Solution
An electric vehicle control device with a motor drive circuit, battery monitoring unit, main CPU, BMU power supply device, down-regulator, and contactor integrated on a single board, where the BMU power supply device lowers battery voltage for the battery monitoring unit and CPU power supply, and the contactor is controlled by the main CPU to supply power to the motor drive circuit, allowing independent operation of the battery monitoring unit and reducing the need for a dedicated charger circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both controllers must start up before battery recharging can begin, then communication reliability between controllers is ensured, but device complexity and cost increase due to additional communication protocols and error handling circuits
Solution Approach 1:
The patent extracts the battery recharging control function from the main controller and assigns it to the auxiliary controller. This allows the auxiliary controller to independently manage recharging operations without requiring continuous communication verification with the main controller, thereby reducing communication complexity while maintaining reliability.
Solution Approach 2:
The auxiliary controller is designed to autonomously detect battery charge status and control the recharging process without needing to constantly communicate with the main controller. This self-service capability eliminates the need for complex inter-controller communication protocols and error handling mechanisms.
2Reliability
If separate power supply devices are provided for each controller, then each controller has dedicated power management, but the overall system complexity and component count increase
Solution Approach 1:
The patent combines the power supply functions for both controllers into a single integrated power supply device. This unified power supply unit manages power distribution to both the main and auxiliary controllers, reducing the total component count while ensuring reliable power delivery to all system components.
Solution Approach 2:
The single power supply device is designed with multi-functional capabilities to serve both controllers simultaneously. It includes integrated voltage regulation and distribution circuits that can dynamically allocate power to different controllers based on their operational needs, eliminating the requirement for separate dedicated power supplies.
3Reliability
If a dedicated charger circuit is provided for battery recharging, then recharging control is precise and reliable, but circuit complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the recharging control function from the main controller and assigns it to the auxiliary controller. This allows the auxiliary controller to independently manage recharging operations using existing power supply circuits, eliminating the need for a dedicated complex charger circuit while maintaining reliable control.
Solution Approach 2:
The auxiliary controller uses simplified sensing and control circuits that replicate the essential recharging control functions without requiring the full complexity of a dedicated charger circuit. This approach achieves reliable recharging control through functional equivalence rather than identical implementation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration simplifies the battery and power supply circuit, enables independent battery monitoring and recharging, reduces the size of the charger circuit, and minimizes wire complexity, while providing superior insulation and protecting against voltage application to external parts.
Implementation Method 1
a BMU power supply device configured to lower an output voltage of the battery to a value suitable for a control voltage for the battery monitoring unit
Implementation Method 2
a down-regulator configured to lower the output voltage of the battery to a value suitable for an input to a CPU power supply device
Implementation Method 3
the down-regulator is a flyback or forward type regulator
Data Source
AI summary
Provided is an electric vehicle control device in which a power supply device has a simple structure. A BMU power supply device (110) lowers a battery voltage to be suitable for the control voltage of a BMU (109). A flyback down-regulator (80) lowers the battery voltage to be suitable for an input of a CPU power supply device (111) which forms a control voltage for a CPU (108). A contactor (90) is disposed on a plus-side line which connects a battery (40) to a motor drive circuit (100), and is opened and closed in response to an instruction from the CPU (108). Control power for the down-regulator (80) is formed by the BMU power supply device (110), and a main switch (113) is disposed to open and close a path through which the voltage of the control power is input to the down-regulator (80).