Single-Source Drive Circuit for Relay and MOS Transistor
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Solution Overview
Problem
Existing power-on/off drive circuits are bulky due to the large volume of contactors and the need for separate drive circuits for relays and MOS transistors, leading to inefficiencies and increased costs.
Innovation Solution
A power-on/off drive circuit design that incorporates a single-source drive circuit to control both the switch circuit and the relay, eliminating the need for a contactor and reducing overall volume by using a single drive circuit for both components, with voltage stabilization features to prevent electric arcs and protect components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate drive circuits are used for relay and MOS transistor, then control reliability is improved, but device complexity and volume increase
Solution Approach 1:
The patent combines the relay drive circuit and MOS transistor drive circuit into a single integrated drive circuit. This single drive circuit controls both the relay coil and the MOS transistor gate, reducing the number of separate drive circuits from two to one, thereby simplifying the overall circuit structure while maintaining the ability to independently control both components.
Solution Approach 2:
The single drive circuit is designed to perform multiple functions: it can drive the relay coil to control the relay switch, and simultaneously drive the MOS transistor to control the load power. This multi-functional design eliminates the need for separate dedicated drive circuits for each component, reducing system complexity.
2Power
If contactor is used for load power control, then power switching capability is improved, but volume of drive circuit increases
Solution Approach 1:
The patent merges the functions of the contactor with those of the relay and MOS transistor into a unified power control system. The relay provides high-voltage isolation and switching, while the MOS transistor provides precise power control, eliminating the need for a separate contactor and its associated drive circuitry, thereby reducing overall volume.
Solution Approach 2:
The patent extracts and removes the contactor component from the traditional power control system. By using the relay and MOS transistor combination instead, the system achieves the same power switching capability without the bulky contactor, significantly reducing the drive circuit volume.
3Manufacturing precision
If multiple components are used for power control, then control precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple control functions into fewer components. The relay provides electrical isolation and switching control, while the MOS transistor provides precise power regulation. This combination achieves high control precision with fewer total components compared to traditional systems using contactors, relays, and separate MOS transistor drives, thereby reducing manufacturing complexity and cost.
Data Source
AI summary
The present invention discloses a power-on/off drive circuit and a method for controlling the power-on/off drive circuit, and belongs to the field of electronic technologies. The power-on/off drive circuit includes a load, a switch circuit, a relay, and a single-source drive circuit; one end of a coil in the relay and a first input end of the single-source drive circuit are separately connected to a positive electrode of a second external power supply, and the other end of the coil in the relay is connected to a second input end of the single-source drive circuit; and a first output end of the single-source drive circuit is connected to a second input end of the switch circuit, a second output end of the single-source drive circuit is connected to the output end of the switch circuit, and a third output end of the single-source drive circuit is connected to a negative electrode of the second external power supply. In the present invention, a volume of a power-on/off drive circuit is reduced.