Backup Power Control System Using MOSFET Switching
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Solution Overview
Problem
Conventional backup power architectures face issues with high power consumption due to diodes, leading to overheating and low efficiency, and lack isolation protection, making them costly and difficult to design for reduced size.
Innovation Solution
A backup power control system incorporating a main power supply unit, negative feedback circuit units, and a control unit that switches between main and standby power supplies using MOS transistors and photocouplers to manage current paths and provide isolation protection, reducing power consumption and preventing current backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional diode is used for switching and turning on the power backup, then the power backup can be switched on, but the power consumption of the diode is too high, resulting in overheating and low electricity conversion efficiency
Solution Approach 1:
The patent replaces the traditional diode switching mechanism with a MOSFET-based electronic switching system. The MOSFETs (Q1, Q2) are controlled by feedback circuits to switch between main power and standby power supplies, replacing the passive diode approach with an actively controlled electronic system that has lower power consumption and better efficiency.
Solution Approach 2:
The patent employs negative feedback circuits (formed by resistors R1-R4 and capacitors C1-C2) that monitor the power supply status and automatically control the MOSFET switching. The feedback mechanism detects voltage levels and current flow to determine when to switch from main to standby power, eliminating the need for high-power diodes while maintaining reliable power backup functionality.
2Reliability
If voltage-proof elements with enough insulation strength are used to meet safety requirements, then isolation protection is provided, but the design is difficult and the cost is high
Solution Approach 1:
The patent introduces an optocoupler (U1) as an intermediary isolation component that provides galvanic isolation between the control circuit and the power switching circuit. The optocoupler transfers control signals optically, maintaining electrical isolation while enabling coordinated switching of the MOSFETs, thus providing isolation protection without requiring complex high-voltage-proof elements throughout the entire circuit.
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 system effectively reduces power consumption, prevents overheating, and provides seamless switching between main and standby power supplies while ensuring isolation protection, thus enhancing efficiency and reliability.
Implementation Method 1
the isolation control unit includes a first photocoupler, a second photocoupler, and a third photocoupler
Data Source
AI summary
A backup power control system includes a main power supply unit, a first negative feedback circuit unit, a standby power supply unit, a second negative feedback circuit unit, and a control unit. The main power supply unit is suitable for outputting a main power. The standby power supply unit is suitable for outputting a standby power. The control unit switches the first negative feedback circuit unit and the second negative feedback circuit unit to be turned on or not to be turned on in response to whether a normal power supply signal of the main power is received. When the normal power supply signal is received, the control unit enables the first negative feedback circuit unit to be turned on and enables the second negative feedback circuit unit not to be turned on.