Dynamic Switch Control to Minimize Power Loss in Converters
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Summary
Problems
Power converters using chopper switches with free-wheel diodes experience significant power loss due to the charge recovery phenomenon, which is not efficiently addressed by existing technologies.
Innovation solutions
A method is introduced to dynamically control the switching speed of the chopper switch based on measurements of power efficiency, such as input and output power ratios or temperature, using a microcontroller and variable resistors to optimize the switching speed and minimize power loss.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If the switching frequency is increased to improve power conversion efficiency, then the power loss due to charge recovery phenomenon increases significantly
Why choose this principle:
The patent applies dynamics by making the switching speed variable rather than fixed. The control circuit dynamically adjusts the switching speed of the chopper switch based on operating conditions, allowing the system to optimize between conversion efficiency and power loss. This is achieved through variable switching speed control that adapts to different load and voltage conditions, resolving the contradiction between maintaining high switching frequency for efficiency and avoiding excessive charge recovery losses.
Principle concept:
If the switching frequency is increased to improve power conversion efficiency, then the power loss due to charge recovery phenomenon increases significantly
Why choose this principle:
The patent changes the parameter of switching speed from a constant value to a variable parameter that can be adjusted according to operating conditions. By modifying the switching speed parameter dynamically, the system can operate at optimal points that balance power conversion efficiency against charge recovery power loss, rather than being constrained to fixed high-frequency operation that always incurs high recovery losses.
Application Domain
Data Source
AI summary:
A method is introduced to dynamically control the switching speed of the chopper switch based on measurements of power efficiency, such as input and output power ratios or temperature, using a microcontroller and variable resistors to optimize the switching speed and minimize power loss.
Abstract
A method for controlling at least one switch in a power converter, wherein the switching speed of the switch dynamically varies according to a measurement of a quantity representative of the efficiency of the converter.