Relay Secondary Coil High Voltage Stability
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Solution Overview
Problem
The existing power battery relays in electric vehicles, driven by 12V low voltage systems, are unable to cope with voltage fluctuations, leading to unstable operation and potential safety issues due to the relay opening under extreme conditions.
Innovation Solution
A relay design that incorporates a secondary coil powered by a high voltage supply to provide additional electromagnetic force, ensuring the relay remains closed, while maintaining low voltage control for on/off operations, thereby isolating the low voltage and high voltage components and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relay driven by 12V low voltage system is used to control high voltage circuit, then the relay can be controlled by low voltage system, but the relay cannot cope with voltage fluctuations and may be forced open under extreme conditions
Solution Approach 1:
The relay control system is segmented into two independent parts: a low voltage control circuit for switching operations and a high voltage power supply circuit for maintaining the closed state. This segmentation allows each circuit to operate independently within its optimal voltage range, resolving the contradiction between low voltage controllability and high voltage stability.
Solution Approach 2:
A high voltage power supply circuit acts as an intermediary between the low voltage control signal and the high voltage relay coil. When the low voltage control circuit activates, it triggers the high voltage power supply to provide sustained power to the relay coil, ensuring the relay remains closed despite low voltage fluctuations. This intermediary mechanism resolves the vulnerability to voltage fluctuations while maintaining low voltage control capability.
2Reliability
If additional high voltage components are added to provide additional electromagnetic force, then the relay stability improves, but the device complexity increases
Solution Approach 1:
The high voltage power supply circuit is merged with the existing relay control system, sharing common components such as the relay switch and control logic. This merging approach allows the system to gain enhanced stability through additional high voltage power delivery while avoiding the complexity of completely separate control systems. The integrated design minimizes component count and simplifies the overall circuit architecture.
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
The solution effectively maintains the high voltage circuit closed despite voltage fluctuations, ensuring driving safety by providing sufficient electromagnetic force through the high voltage supply while still allowing low voltage control for opening the relay in unexpected situations.
Implementation Method 1
coil current of the main coil is powered by the low voltage supply, the first armature is located in the high voltage circuit, and is correspondingly in a position to open and close the high voltage circuit in response to power down and power up of the main coil
Implementation Method 2
the secondary coil is powered up to generate additional electromagnetic force that places the first armature in the close position when the driving circuit is closed
Data Source
AI summary
A relay for a high voltage circuit comprises a main coil and a first armature, wherein the first armature is located in the high voltage circuit and is correspondingly in a position to open and close the high voltage circuit in response to power down and power up of the main coil; a secondary coil that cooperates with the first armature and a driving circuit that supplies power to the secondary coil, wherein the driving circuit is powered by a high voltage supply of the high voltage circuit, the secondary coil is powered up to generate additional electromagnetic force that places the first armature in the closed position when the driving circuit is closed; and a second armature located in the driving circuit, and is correspondingly in a position to open or close the driving circuit in response to power down and power up of the main coil.