MOSFET Diode Module Load Control for Heat Reduction
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Solution Overview
Problem
Conventional AC/DC converter circuits, particularly boost circuits used for power factor correction, generate excessive heat and suffer from electromagnetic interference (EMI) due to high current loads, which can lead to overheating and poor operational environments.
Innovation Solution
A circuit incorporating a metal-oxide semiconductor field-effect transistor, a diode module with multiple diodes connected in parallel, and a load determination unit that controls switches based on load current to reduce heat generation and optimize EMI characteristics by adjusting the number and size of diodes active during heavy loads, utilizing a memory look-up table for optimal conduction combinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional boost circuit is used for power factor correction, then the power factor can be improved, but excessive heat is generated due to large current loads
Solution Approach 1:
The patent divides the single diode into multiple parallel diodes (first diode, second diode, third diode, fourth diode), each handling a portion of the total current. This segmentation reduces the current burden on each individual diode, thereby reducing heat generation while maintaining the overall power factor correction function.
2Temperature
If multiple diodes are connected in parallel to reduce current per diode, then heat generation is reduced, but the device complexity increases
Solution Approach 1:
The patent implements dynamic control of the parallel diodes through a control circuit that adjusts which diodes are activated based on real-time current conditions. This dynamic approach allows the system to adapt to varying load conditions, reducing heat generation when needed while managing complexity through intelligent control rather than static configuration.
3Temperature
If diodes are connected in parallel to reduce heat, then heat generation is reduced, but electromagnetic interference problems worsen
Solution Approach 1:
The patent incorporates a control circuit that monitors current conditions and provides feedback to dynamically adjust the activation state of individual diodes. This feedback mechanism allows the system to optimize EMI performance by selectively controlling which diodes conduct at any given moment, thereby reducing electromagnetic interference while maintaining effective heat management.
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 reduces heat generation and optimizes EMI in power factor correction circuits by dynamically managing diode conduction based on load currents, enhancing the efficiency and reliability of the power factor correction process.
Implementation Method 1
When the load is heavy, more than two diodes of the diode module are switched on, so that the current flowing through a single diode can be reduced
Implementation Method 2
because of the contact capacitance effect after the diodes are connected in parallel, it can further optimize the electromagnetic interference (EMI) characteristics
Data Source
AI summary
A circuit with a metal-oxide semiconductor field-effect transistor and a diode module is applied to a power factor correction circuit, which can effectively reduce the heat generated by the whole system under heavy load. The circuit includes a metal-oxide semiconductor field-effect transistor and a diode module and a load determination unit. The diode module includes a plurality of diodes with a switch. The load determination unit can control the connection/disconnection of each diode in the diode module based on the magnitude of the load current. It can effectively reduce the current generated by each diode due to the load, thereby reducing the heat generation of the overall system. Moreover, due to the contact capacitance effect after the diodes are connected in parallel, the electromagnetic interference (EMI) characteristics of the power factor correction circuit of the system can be further optimized.