Current-Fed Isolation Converter Snubber Circuit
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Solution Overview
Problem
Conventional current-fed isolation converters with RCD snubber circuits suffer from efficiency loss and increased heat generation, and the snubber circuits with resonance-based energy regeneration face challenges in setting constant values and stability due to variations in circuit elements.
Innovation Solution
A current-fed isolation converter with a regeneration-type snubber circuit that includes a rectifying element and a capacitive element, where the capacitive element is charged by a second electric current, and a step-down power supply circuit regenerates electric charge to maintain a predetermined voltage, controlling excess voltage and stabilizing the circuit operation regardless of variations in circuit elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional RCD snubber circuit is used, then the excess voltage is suppressed, but the efficiency decreases and heat generation increases
Solution Approach 1:
The patent converts the harmful excess voltage into useful energy by using a rectifying element to convert the voltage into charge, which is then stored in a capacitive element. This stored charge is subsequently reused by a step-down power supply circuit to suppress voltage rise at the switching element, thereby transforming the harmful voltage spike into a beneficial energy recovery mechanism that improves efficiency while maintaining voltage suppression.
2Loss of energy
If a resonance-based snubber circuit is used, then energy is regenerated, but it is hard to set constant values and design stably due to variations in circuit elements
Solution Approach 1:
The patent implements a feedback mechanism where a detection circuit monitors the charge level of the capacitive element and provides signals to a control circuit. The control circuit adjusts the operation of the step-down power supply circuit based on this feedback, ensuring stable and constant voltage suppression performance regardless of variations in circuit elements. This feedback control enables reliable energy regeneration without the stability issues of resonance-based circuits.
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 stable and efficient snubber circuit operation that effectively controls voltage applied to switching elements, prevents voltage rise, and maintains stable voltage potential levels during bidirectional power transmission, even with variations in circuit elements.
Implementation Method 1
a snubber circuit that includes a rectifying element and a capacitive element, the capacitive element being charged by a second electric current flowing in the rectifying device
Implementation Method 2
a snubber circuit that includes a rectifying element and a capacitive element, the capacitive element being charged by a second electric current flowing in the rectifying device
Implementation Method 3
a step-down power supply circuit that regenerates electric charge of the capacitive element to the power source
Implementation Method 4
The snubber circuit controls an excess voltage that is generated when the switching element is turned off. The power supply circuit maintains a charging voltage of the capacitive element as a predetermined voltage value
Data Source
AI summary
A current-fed isolation converter includes a coil that is connected to a primary side of a transformer, a power source that supplies electric power to the primary side of the transformer, a switching element that controls a first electric current flowing in the coil, a snubber circuit that includes a rectifying element and a capacitive element that is charged by a second electric current flowing in the rectifying element, and a step-down power supply circuit that regenerates electric charge of the capacitive element to the power source. The snubber circuit controls an excess voltage that is generated when the switching element is turned off. The power supply circuit maintains a charging voltage of the capacitive element at a predetermined voltage value.