Power Switching Circuit for EV Charge-Drive Mode Transitions
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Solution Overview
Problem
Existing power adjusting systems for electric vehicles lack efficient methods to dynamically adjust power between charging and motor driving modes, leading to suboptimal performance and potential abnormalities in power distribution.
Innovation Solution
A power adjusting system comprising a switching circuit, a motor driver circuit, a detector circuit, and a controller circuit, which allows for seamless transitions between battery charging and motor driving modes by controlling the operations of high-side and low-side switches based on detected voltage and current signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a power adjusting system uses traditional switching circuits for battery charging and motor driving, then the basic power distribution function is achieved, but the system cannot efficiently dynamically adjust power between charging and driving modes, leading to suboptimal performance
Solution Approach 1:
The patent implements dynamic power adjustment by enabling the switching circuit to flexibly transition between battery charging mode and motor driving mode based on real-time system requirements. The controller dynamically controls the switching components (MOSFETs/IGBTs) to adjust power distribution, allowing the system to adapt to varying power demands and optimize performance while maintaining stability through controlled transitions.
Solution Approach 2:
The switching circuit is designed to perform multiple functions: it can operate in battery charging mode where power flows from the battery to the charging pile, and in motor driving mode where power flows from the battery to the motor. This multi-functional capability allows a single circuit to handle both charging and driving operations, improving overall system efficiency and reducing the need for separate dedicated circuits.
2Adaptability or versatility
If the system transitions between charging and motor driving modes, then operational flexibility is improved, but potential abnormalities in power distribution may occur
Solution Approach 1:
The detector circuit continuously monitors the power distribution state and provides feedback to the controller. This feedback mechanism enables the controller to detect potential abnormalities during mode transitions and adjust the switching control accordingly, ensuring stable power distribution while maintaining the ability to switch between charging and driving modes.
Solution Approach 2:
The patent incorporates protection circuits that anticipate potential abnormalities during mode transitions. The controller is designed to preemptively manage the switching process, implementing protective measures before abnormalities can occur. This includes controlled transition sequences and abnormality detection mechanisms that prevent unstable power distribution states.
3Manufacturing precision
If the switching circuit uses multiple high-side and low-side switches for motor control, then motor driving precision is improved, but the circuit complexity increases
Solution Approach 1:
The same switching circuit components (high-side and low-side switches) are used for both motor driving and battery charging operations. This multi-functional design allows the circuit to achieve precise motor control while avoiding the need for separate dedicated switching circuits, thereby reducing overall system complexity despite the sophisticated control capabilities required.
Data Source
AI summary
A power adjusting system and method are provided. The power adjusting method is applicable to the power adjusting system. The power adjusting method includes processes of: detecting an input voltage of the power adjusting system by a detector circuit of the power adjusting system; detecting voltages of first terminals of high-side switches of the power adjusting system by the detector circuit; detecting a voltage of a battery by the detector circuit; detecting currents flowing to the high-side switches by the detector circuit; detecting a current flowing through the battery; detecting a current flowing through a motor; determining whether or not abnormal conditions occur in the power adjusting system and the motor according to the detected voltages and currents, and accordingly controlling operations of the high-side switches and low-side switches and a switching circuit of the power adjusting system, by a controller circuit of the power adjusting system.