Power Converter Dynamic Mode Switching for Wide Input Voltage
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Solution Overview
Problem
Relays in electric power delivery systems face installation flexibility issues due to being designed for specific preset input voltages, limiting their ability to operate across different voltage ranges and locations.
Innovation Solution
A power converter with control circuitry that dynamically selects between fixed frequency PWM and quasi-resonant control modes based on input voltage, allowing efficient operation across a wide range of input voltages from 19.2V-60V to 60V-300V.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a power converter is designed for a specific preset input voltage, then it operates efficiently at that voltage, but it cannot operate across different voltage ranges and locations
Solution Approach 1:
The power converter dynamically switches between different control modes (PWM and quasi-resonant) based on the input voltage level. The control circuitry monitors the input voltage and automatically selects the appropriate control mode, enabling the converter to adapt to a wide input voltage range (19.2V-60V for PWM mode, 60V-300V for quasi-resonant mode) without requiring multiple fixed-design converters
Solution Approach 2:
The invention changes the control parameter (control mode) based on the input voltage parameter. By detecting the input voltage level and switching between PWM control mode for lower voltages and quasi-resonant control mode for higher voltages, the system optimizes performance across different voltage conditions while maintaining a single converter design
2Power
If a power converter operates at high input voltages, then it delivers higher power, but switching losses and peak current stress increase
Solution Approach 1:
The control circuitry detects the input voltage level and changes the control mode parameter accordingly. For high input voltages (60V-300V), it selects quasi-resonant control mode which reduces switching losses by operating at resonant frequencies, while for lower voltages (19.2V-60V), it uses PWM control mode. This dynamic parameter adjustment maintains high power delivery efficiency across different voltage levels
3Power
If a power converter operates at high input voltages, then it delivers higher power, but peak current stress increases
Solution Approach 1:
The system changes the control mode parameter based on input voltage detection. In quasi-resonant control mode (for 60V-300V input), the control circuitry adjusts the switching timing and duty cycle to reduce peak current stress while maintaining high power delivery. The resonant operation allows for softer current transitions compared to traditional PWM, reducing stress on switching components
Data Source
AI summary
The present disclosure relates to power converters that convert power in different control modes based on the input voltage. For example, a power converter may include power conversion circuitry that receives electrical energy from an input at an input voltage and provides the electrical energy at an output voltage. The power converter may include control circuitry that receives a signal indicating the input voltage. The control circuitry may select a control mode from a plurality of control modes based at least in part on the input voltage. The control circuitry may control operation of the switch of the power conversion circuitry based at least in part on the control mode selected.