DC-DC Converter Phase Shift Frequency Control
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Solution Overview
Problem
The full bridge circuit of the phase shift system experiences increased switching loss and decreased efficiency due to long charge-discharge times of parasitic capacitance at small power supply levels, and the operation principles differ from resonant circuits, making applicable technologies incompatible.
Innovation Solution
A DC-DC converter with a full bridge circuit composed of series-connected switching legs, parallel-connected switching elements, and a control system that switches between heavy and light load modes based on power supply levels, utilizing zero voltage switching and frequency control to optimize efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the full bridge circuit of the phase shift system is used to achieve zero voltage switching, then switching loss is reduced and efficiency is improved at large power supply levels, but time required for charge-discharge of parasitic capacitance becomes long at small power supply levels, causing hard switching and increased switching loss
Solution Approach 1:
The patent dynamically switches between two operating modes based on load conditions: phase shift control for heavy loads and frequency control for light loads. This dynamic adaptation allows the system to optimize charge-discharge time of parasitic capacitance according to power supply levels, preventing hard switching at light loads while maintaining zero voltage switching benefits at heavy loads
Solution Approach 2:
The patent changes the control parameter from phase shift to frequency based on load conditions. At light loads, frequency control is used to ensure sufficient charge-discharge time of parasitic capacitance, while at heavy loads, phase shift control is used to maintain zero voltage switching. This parameter change resolves the contradiction between switching loss reduction and charge-discharge time requirements
2Use of energy by moving object
If the full bridge circuit operates at small power supply levels, then power consumption is reduced, but switching loss increases due to insufficient charge-discharge of parasitic capacitance, decreasing efficiency
Solution Approach 1:
The system dynamically adjusts control strategy based on power supply levels. At small power levels, frequency control is implemented to ensure adequate charge-discharge time of parasitic capacitance, preventing hard switching and maintaining efficiency. At large power levels, phase shift control is used to achieve zero voltage switching. This dynamic adjustment ensures low power consumption without incurring excessive switching loss
3Loss of energy
If the phase shift system is used to achieve zero voltage switching, then efficiency is improved at large power levels, but the operation principle differs from resonant circuits, making technology from resonant circuits inapplicable
Solution Approach 1:
The patent creates a hybrid control system that can operate in two distinct modes: phase shift control for heavy loads and frequency control for light loads. This multi-functionality allows the system to benefit from zero voltage switching at heavy loads while incorporating frequency control principles from resonant circuits at light loads, thereby achieving both efficiency improvement and technological adaptability
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 provides a highly efficient DC-DC converter that maintains efficiency regardless of power supply levels, enabling efficient power supply to loads, including in vehicles, by minimizing switching losses and adapting to varying load conditions.
Implementation Method 1
a transformer for magnetically connecting a primary winding and a secondary winding
Data Source
AI summary
Provided is a vehicle which enables a highly-efficient DC-DC converter and a highly-efficient power supply to a load, regardless of a power supply amount of to the load. When the power supply amount to a load R1 is a predetermined value or more, a control means 5 implements a first mode for making the switching elements S1 to S4 driven, and when the power supply amount of to the load R1 is the predetermined value or less, the control means 5 implements a second mode, for making the switching elements S3 and S4 stopped in an OFF state, and making only the switching elements S1 and S2 driven.