Phase Shift Full Bridge Converter Light Load Efficiency
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Solution Overview
Problem
Phase shift full bridge DC/DC power converters consume significant power in standby mode due to continuous operation during light load conditions, leading to inefficiencies and increased CO2 emissions.
Innovation Solution
A phase shift full bridge power converting system with a control method that includes a load state detecting module, switching controller, and modulator module to adjust switching modes based on load states, optimizing power converter efficiency by changing the output of the modulator according to load conditions, reducing standby power consumption and increasing efficiency under light load states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the phase shift full bridge DC/DC power converter operates continuously in standby mode to supply stable DC voltage, then the output voltage stability is improved, but the standby power consumption increases
Solution Approach 1:
The patent applies dynamics by transitioning from a static continuous operation mode to a dynamic switching mode. The controller dynamically switches between phase shift full bridge mode and pulse width modulation mode based on load conditions. This dynamic adaptation allows the system to maintain output voltage stability while reducing standby power consumption by stopping switching operations during light load conditions.
Solution Approach 2:
The patent changes the operating parameters of the power converter based on load conditions. By detecting load state and adjusting the switching mode accordingly, the system changes parameters such as switching frequency and duty cycle. This parameter adjustment enables the system to optimize between voltage stability and power consumption by operating in different modes appropriate to each load condition.
2Stability of the object's composition
If the phase shift full bridge DC/DC power converter operates under light load conditions, then the output voltage is maintained, but the power converting efficiency decreases due to circulating current loss
Solution Approach 1:
The system dynamically switches between operating modes based on load detection. Under light load conditions, the controller transitions from phase shift full bridge mode to pulse width modulation mode, which eliminates circulating current loss while maintaining output voltage. This dynamic mode switching resolves the contradiction by adapting the operating characteristics to match the actual load requirements.
Solution Approach 2:
The patent changes the switching mode parameter based on load state detection. When light load is detected, the system changes from phase shift full bridge switching to pulse width modulation switching, fundamentally altering the operating parameters to eliminate circulating current and improve efficiency while maintaining voltage output.
3Object-generated harmful factors
If the multi-stage power supply operates with both stages active, then the power factor is improved, but the standby power consumption increases due to both stages operating
Solution Approach 1:
The patent applies dynamics by implementing conditional stage operation. During standby mode, the system dynamically deactivates the second stage while keeping the first stage active, maintaining power factor correction benefits while eliminating unnecessary power consumption. Under full load conditions, both stages operate together to maintain optimal power factor and voltage regulation.
Data Source
AI summary
A phase shift full bridge power converting system and a control method has the phase shift full bridge power converting system with a power converter, a controller, a load state detecting module, a switching controller, a switch module, a command generating module, a comparator, and a modulator module. The load state detecting module interfaces with the power converter and the switching controller. The load state detects module detects load parameter data of the power converter and switches a state at an output by using the switching controller. The controller obtains an error value between an output voltage of the comparator and a command voltage and calculates a duty cycle parameter by using the error value. According to the duty cycle parameter, a pulse control signal is generated to be outputted to a drive module for controlling the driving of the power converter.