Flyback Relay Drive Voltage Isolation
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Solution Overview
Problem
Contemporary vacuum relays lack sufficient standoff voltage from contact to chassis or coil, leading to potential arcing and breakdown, while high voltage relays require excessive power and are susceptible to oxidation and environmental factors.
Innovation Solution
A flyback system with a tank circuit and switching device that pulses energy between primary and secondary sides, utilizing an isolation transformer for voltage isolation and efficient power delivery, eliminating the need for large isolation feedback techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If vacuum relays are used with small clearance distance, then device size is reduced, but voltage isolation and reliability deteriorate due to arcing and breakdown
Solution Approach 1:
An isolation transformer is introduced as an intermediary component between the low-voltage control circuit and the high-voltage power circuit. The transformer provides galvanic isolation through magnetic coupling, allowing voltage isolation without requiring large physical clearance distances in the relay structure.
Solution Approach 2:
The patent replaces the mechanical isolation approach (relying on physical clearance distances) with an electromagnetic isolation approach using an isolation transformer. This substitution allows reliable voltage isolation while maintaining compact relay dimensions.
2Reliability
If large open frame high voltage contactors are used, then voltage isolation is improved, but power consumption and device size increase
Solution Approach 1:
The isolation transformer acts as a mediator that provides voltage isolation without requiring large high-voltage contactors. By transferring power magnetically through the transformer, the system achieves isolation while using only the power necessary for the actual load, eliminating the excessive power consumption of large contactor-based isolation systems.
3Reliability
If isolation power supply is added to protect ELV circuits, then reliability is improved, but device complexity increases
Solution Approach 1:
The isolation transformer serves multiple functions simultaneously: it provides voltage isolation, electrical protection for ELV circuits, and power transmission. This multi-functionality eliminates the need for separate isolation power supply circuits, maintaining reliability while avoiding increased device complexity.
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 flyback system achieves high efficiency and minimizes excess power consumption while providing reliable voltage isolation, protecting against arcing and environmental influences.
Implementation Method 1
a tank circuit comprising a primary side and a secondary side... a switching device configured to pulse energy to the tank circuit. The energy is stored in a primary side of the tank circuit when the switching device is on. The energy is transferred from the primary side to the secondary side when the switching device is off
Data Source
AI summary
Disclosed herein is a flyback system. The flyback system includes a tank circuit comprising a primary side and a secondary side. The flyback system also includes a switching device configured to pulse energy to the tank circuit. The energy is stored in a first side of the tank circuit when the switching device is on. The energy is transferred from the primary side to the secondary side when the switching device is off.