Switching Power Supply Driver with Dynamic Capacity Control
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Solution Overview
Problem
Existing driving systems for switching power supplies face challenges in reducing both switching noise at the start of resonant operation and switching loss during resonant operation, as neither can be effectively minimized simultaneously due to trade-offs in p-channel transistor driving capacity.
Innovation Solution
A driving system with a driving capacity control circuit that adjusts the driving capacity of the main driver and sub-driver to enhance performance during resonant operation while minimizing noise and loss, utilizing configurations such as current mirror circuits, capacitors, and resistors to manage the switching device's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the driving capacity of the p-channel transistor is increased to reduce switching loss during resonant operation, then switching loss is reduced, but switching noise at the start of resonant operation increases
Solution Approach 1:
The patent applies dynamics by making the driving capacity of the driving circuit adjustable rather than fixed. The driving capacity control circuit dynamically changes the driving capacity based on the operational state - using lower capacity at the start of resonant operation to reduce noise, and higher capacity during resonant operation to reduce switching loss. This is achieved through switching between different circuit configurations (with or without the capacitor connected).
Solution Approach 2:
The patent changes the driving capacity parameter of the driving circuit based on the operational phase. By controlling the capacitor connection state, the driving capacity is varied - disconnected during start-up to limit noise, and connected during resonant operation to enhance switching performance and reduce loss. This parameter change allows optimization for different operational requirements.
2Object-generated harmful factors
If the driving capacity of the p-channel transistor is decreased to reduce switching noise at the start of resonant operation, then switching noise is reduced, but switching loss during resonant operation increases
Solution Approach 1:
The patent uses dynamics to switch between different driving capacity states. The driving capacity control circuit enables the system to adapt - using lower capacity (capacitor disconnected) when noise reduction is critical during start-up, and higher capacity (capacitor connected) when loss reduction is priority during resonant operation. This dynamic adaptation resolves the contradiction.
Solution Approach 2:
The patent changes the driving capacity parameter based on operational phase requirements. The capacitor connection state is switched - disconnected during start-up to reduce noise generation, and connected during resonant operation to improve switching efficiency and reduce loss. This parameter adjustment allows the system to optimize for different operational priorities.
3Device complexity
If a fixed driving capacity is used throughout operation, then the circuit configuration is simple, but both switching noise and switching loss cannot be effectively minimized simultaneously
Solution Approach 1:
The patent segments the driving operation into distinct phases (start of resonant operation and resonant operation) and applies different driving capacity configurations for each phase. The driving capacity control circuit divides the operation into segments where the capacitor is disconnected during start-up and connected during resonant operation, allowing optimized performance for each segment while managing overall complexity.
Solution Approach 2:
The patent introduces dynamics to the circuit configuration through the driving capacity control circuit, which automatically adjusts the capacitor connection state based on operational phase. This dynamic adjustment enables the system to achieve optimized noise and loss performance without requiring complex manual intervention or overly complicated circuit design.
Data Source
AI summary
A driving system for an electrical power conversion equipment includes a driving circuit for driving a switching device provided in the electrical power conversion equipment, and a driving capacity control circuit for controlling a driving capacity of the driving circuit. The driving capacity during a resonant operation of the electrical power conversion equipment becomes higher than that at a start of the resonant operation when the switching device is turned-on.