Resonant Circuit Control Method for Wide Voltage Range
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Solution Overview
Problem
Existing resonant circuits in switching power supplies face challenges in achieving a wide output voltage range while maintaining a narrow operating frequency range, leading to excessive frequency adjustments and high costs due to high input voltage requirements.
Innovation Solution
A control method that operates switching transistors in two driving modes, adjusting the ratio of operating periods in these modes to control output voltage, thereby stabilizing the frequency and achieving a wide output voltage range without excessive frequency variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the resonant circuit uses a single frequency control method to adjust output voltage, then the control circuit is simple, but the operating frequency range becomes excessively wide leading to high costs
Solution Approach 1:
The patent divides the resonant circuit operation into two distinct driving modes: first driving mode where the resonant circuit operates in a conventional manner, and second driving mode where the resonant circuit operates with modified switching patterns. By segmenting the operation into multiple modes and selectively activating them based on output voltage requirements, the system achieves wide output voltage range without requiring excessively wide frequency adjustments, thus resolving the contradiction between control simplicity and adaptability.
2Adaptability or versatility
If the resonant circuit operates with wide frequency range to achieve wide output voltage range, then the output voltage range is sufficient, but the switching transistors experience high stress and costs increase
Solution Approach 1:
The patent changes the operating parameters of the resonant circuit by introducing a second driving mode with different switching characteristics. In this mode, the switching transistors operate under more favorable conditions with reduced voltage stress, while still achieving the required output voltage range through coordinated operation of multiple transistors. This parameter change resolves the contradiction by maintaining adaptability while improving reliability.
3Ease of operation
If the resonant circuit uses conventional frequency control to adjust output voltage, then the control method is simple, but the operating frequency must be adjusted excessively wide
Solution Approach 1:
The patent introduces dynamic operation by allowing the resonant circuit to switch between two different driving modes based on control signals. This dynamic approach enables the system to maintain a relatively narrow and stable operating frequency range while achieving wide output voltage adjustment through mode transitions rather than frequency sweeping, thus resolving the contradiction between operational simplicity and frequency stability.
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
This approach allows the resonant circuit to maintain a narrow operating frequency range while supporting a wide output voltage range, reducing the need for excessive frequency adjustments and lowering costs associated with high input voltage stress.
Implementation Method 1
The resonant circuit includes at least two switching transistors conducted complementarily, a resonant inductor, a resonant capacitor and a transformer
Implementation Method 2
The resonant circuit includes at least two switching transistors conducted complementarily, a resonant inductor, a resonant capacitor and a transformer
Data Source
AI summary
A control method includes the steps of: setting first control periods of a switching transistor group, the first control periods including operating periods in the first driving mode and operating periods in the second driving mode; setting an output voltage and a K value in a directly proportional relationship, wherein the K value is the ratio of the number of the operating periods in the second driving mode to the number of the operating periods in the first driving mode; receiving the output voltage, and determining a K value corresponding to the existing output voltage according to the set relationship between the output voltage and the K value; and outputting a driving signal group of the switching transistor group according to the number of the operating periods in the first driving mode and the number of the operating periods in the second driving mode.