Series Resonant Circuit Voltage Stabilization Without Dummy Load
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Solution Overview
Problem
Conventional series resonant circuits experience an unpleasant drifted output voltage when operating at a fixed frequency with no load, leading to high no-load loss due to the need for a dummy load to equalize power consumption across varying operation frequencies.
Innovation Solution
A series resonant circuit device with a resonant capacitor, magnetizing inductor, and transformer, where a current impulse circuit is synchronized with the input voltage to reduce the current difference between the resonant and magnetizing inductors, allowing the circuit to operate efficiently without a dummy load by providing current impulses to the equivalent capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a dummy load is coupled to the output terminal to avoid drifted output voltage, then output voltage stability is improved, but no-load loss increases
Solution Approach 1:
The patent extracts the harmful dummy load from the system by replacing it with a current impulse circuit that provides controlled current impulses to the resonant circuit, eliminating the need for continuous power consumption while maintaining output voltage stability
Solution Approach 2:
The patent applies periodic action by using a current impulse circuit that delivers periodic current impulses to the resonant circuit at specific frequencies, replacing the continuous power consumption of the dummy load with targeted periodic energy input that maintains voltage stability without continuous loss
2Adaptability or versatility
If a wide range of operation frequency is used to modulate output voltage, then output voltage modulation capability is improved, but operation efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the operation frequency adjustable and adaptive rather than fixed, allowing the resonant circuit to operate at optimal frequencies for different load conditions, thereby maintaining high efficiency across varying output voltage requirements
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 stabilizes the output voltage with no load, reducing power transfer from the primary to the secondary winding and narrowing the operation frequency variation range, thereby improving efficiency and minimizing no-load loss.
Implementation Method 1
A series resonant circuit is often applied to a power supply... an input voltage is generated by the input voltage generating circuit and then frequency-converted by the series resonant circuit
Implementation Method 2
a transformer Tl... The current difference between the current through the resonant inductor Lr and the current through the magnetizing inductor Lm will be transferred from the primary winding Np to the secondary winding Ns
Data Source
AI summary
A series resonant circuit device and a voltage stabilizing method thereof are provided. The series resonant circuit device includes a resonant circuit having at least a resonant capacitor and a resonant inductor, an equivalent capacitor electrically coupled to the resonant circuit, a magnetizing inductor electrically connected to the equivalent capacitor in parallel, a transformer having a primary winding electrically connected to the magnetizing inductor in parallel, and a current impulse circuit electrically coupled to the resonant circuit and synchronized with an input voltage of the series resonant circuit device. The voltage stabilizing method is to provide a current impulse to the equivalent capacitor so as to decrease a current difference between the resonant inductor and the magnetizing inductor when the input voltage varies.