Power Converter Control Device for Low-Load Efficiency
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Solution Overview
Problem
Existing voltage converters face significant power consumption losses during low-load states, as they are not efficiently managed by current control devices, leading to reduced reliability and increased energy wastage.
Innovation Solution
A control device for power converters that includes a set of first and second rectifiers connected in series, with a load determiner to differentiate between high-load and low-load states, and controllers to synchronize or reduce the on-duration of rectifiers accordingly, thereby optimizing power usage and maintaining reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage converter operates all rectifiers continuously to maintain reliability, then the reliability is improved, but the power consumption loss increases during low-load states
Solution Approach 1:
The control device dynamically adjusts the operation mode of rectifiers based on load conditions. During high-load states, all rectifiers operate normally to ensure reliability. During low-load states, the control device reduces the on-duration of rectifiers to minimize power consumption loss, while still maintaining adequate reliability through selective operation.
Solution Approach 2:
The control device changes the operational parameters (on-duration) of rectifiers according to load conditions. By adjusting the duty cycle and on-duration of rectifiers based on whether the system is in high-load or low-load state, the device optimizes the balance between reliability and power consumption loss.
2Loss of energy
If the voltage converter reduces rectifier on-duration to reduce power consumption loss, then the power consumption loss is reduced, but the reliability deteriorates
Solution Approach 1:
The system dynamically switches between different operation modes (high-load mode and low-load mode) based on real-time load conditions. This dynamic adjustment allows the system to reduce power consumption during low-load states while maintaining reliability during high-load states, resolving the contradiction between these two parameters.
Solution Approach 2:
The control device uses feedback from load condition detection to adjust rectifier operation. By continuously monitoring the load state and adjusting the on-duration of rectifiers accordingly, the system maintains optimal performance and reliability while minimizing power consumption loss during low-load periods.
3Power
If the voltage converter uses multiple power supply units in parallel to handle high-load states, then the power handling capability is improved, but the power consumption loss increases during low-load states
Solution Approach 1:
The power supply system is segmented into multiple independent power supply units, each capable of operating autonomously. During low-load states, only one power supply unit operates while others remain inactive, reducing power consumption loss. During high-load states, multiple units are activated to handle the increased power demand, thus resolving the contradiction between power handling capability and power consumption loss.
Solution Approach 2:
The control device periodically evaluates load conditions and adjusts the number of active power supply units accordingly. This periodic switching between single-unit and multi-unit operation modes allows the system to maintain adequate power handling capability while minimizing power consumption during low-load periods.
Data Source
AI summary
In a control device, a load determiner determines whether a power converter is in a high-load state or a low-load state. A high-load controller controls on-off operations of the first rectifiers such that on durations of the first rectifiers are respectively synchronized with each other when it is determined that the power converter is in the high-load state. A low-load controller controls on-off operations of the first rectifiers to reduce the on durations of the first rectifies synchronized with each other when it is determined that the power converter is in the low-load state.