Current Blocking Circuit for Resonant Converters
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Solution Overview
Problem
In resonant converters, the regeneration of resonance current can lead to reverse charging of direct-current power sources like fuel cells, causing performance deterioration.
Innovation Solution
A power supply system with a resonant converter that includes a current blocking circuit to prevent reverse charging, where the resonance current is blocked by a diode or reactor, and a bypass switch is used to control the current flow when the main current exceeds a predetermined value, and in multi-phase systems, the current blocking circuit is strategically placed to manage phase differences and driving periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a resonant converter is used to achieve soft switching, then power losses at switching are decreased, but resonance current may flow backward to the direct-current power source causing reverse charging and performance deterioration
Solution Approach 1:
A current blocking circuit is introduced as an intermediary component between the resonant converter and the direct-current power source. This circuit selectively blocks resonance current from flowing backward to the power source while allowing main current to pass through, thus preventing reverse charging without affecting the soft switching operation of the resonant converter.
Solution Approach 2:
The current path is segmented into forward current path and backward current path using the current blocking circuit. The blocking circuit is configured to allow main current to flow from the power source to the load while preventing resonance current from flowing backward to the power source, effectively separating the two current directions.
2Reliability
If a current blocking circuit is added to prevent reverse charging, then performance deterioration of the direct-current power source is prevented, but circuit complexity increases
Solution Approach 1:
A current blocking circuit is introduced as an intermediary component between the resonant converter and the direct-current power source. This circuit selectively blocks resonance current from flowing backward to the power source while allowing main current to pass through, thus preventing reverse charging without affecting the main current flow.
Solution Approach 2:
The current blocking circuit is designed to perform multiple functions: blocking resonance current in the backward direction while allowing main current in the forward direction. This multi-functionality reduces the need for additional separate components, thereby minimizing the increase in circuit complexity.
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
Prevents reverse charging of direct-current power sources, thereby preventing performance deterioration and reducing circuit losses by effectively managing resonance currents.
Implementation Method 1
a resonant converter which converts a direct-current voltage input from the direct-current power source into a predetermined output voltage by soft switching based on a current resonance phenomenon
Implementation Method 2
a current blocking circuit which blocks the resonance current toward the direct-current power source is provided... a diode in which an anode is connected to an electricity path on the side of the direct-current power source and a cathode is connected to the electricity path on the side of the connection point
Data Source
AI summary
Between a direct-current power source and a connection point where a resonance current flowing in an opposite direction from a main current joins the main current from the direct-current power source in a resonant converter, there is provided a current blocking circuit which blocks the resonance current toward the direct-current power source. In consequence, it is possible to prevent the reverse charging of the direct-current power source with the resonance current which realizes soft switching in the resonant converter.