Flyback-Chip LLC Resonant Control Circuit for Lower Cost and Size
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Solution Overview
Problem
Existing LLC resonant circuits are expensive and voluminous due to reliance on foreign semiconductor chips, limiting their widespread adoption and product competitiveness.
Innovation Solution
An LLC resonant topology control circuit based on a flyback chip, which includes a current mode flyback chip U1, drive circuits, a charge pump circuit, and a feedback circuit, to control the LLC resonant topology, reducing volume and cost while improving design flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If professional control chips from foreign semiconductor companies are used to make LLC resonant circuits, then the control performance is reliable, but the cost is high and the volume is large
Solution Approach 1:
The patent uses a flyback control chip to implement LLC resonant control functionality, effectively creating a simplified copy or alternative implementation of the traditional dedicated LLC control chip. This approach achieves the desired control performance while using a smaller, more cost-effective component platform
Solution Approach 2:
The flyback control chip U1 is designed to perform multiple functions including both flyback control and LLC resonant control. By making the chip multi-functional, the system can achieve reliable LLC control performance without requiring a separate dedicated LLC control chip, thereby reducing overall system volume and cost
2Reliability
If professional control chips from foreign semiconductor companies are used to make LLC resonant circuits, then the control performance is reliable, but the cost is high
Solution Approach 1:
The patent uses a flyback control chip to implement LLC resonant control functionality, effectively creating a simplified copy or alternative implementation of the traditional dedicated LLC control chip. This approach achieves the desired control performance while using a smaller, more cost-effective component platform
Solution Approach 2:
The patent replaces expensive foreign semiconductor LLC control chips with a more economical flyback control chip platform. This substitution uses a cheaper, more readily available chip type that can be easily sourced and manufactured, significantly reducing the overall system cost while maintaining functional performance
3Volume of stationary object
If a flyback chip is used to control LLC resonant topology, then the volume is reduced and cost is lowered, but the design complexity increases
Solution Approach 1:
The patent introduces a charge pump circuit as an intermediary component to bridge the flyback control chip and the LLC resonant circuit. This intermediary handles the additional complexity of voltage pumping and synchronization, allowing the main control chip to remain relatively simple while achieving the desired volume reduction and cost savings
Data Source
AI summary
The present disclosure relates to an LLC resonant topology control circuit base on a flyback chip, including an LLC resonant cavity, a current mode flyback chip U1, a first drive circuit, a second drive circuit, a charge pump circuit and a feedback circuit, wherein the LLC resonant cavity includes a switching transistor Q1, a switching transistor Q2, a resonant inductor L1, a resonant capacitor C1 and an output transformer T1; the switching transistor Q1 is connected in series with the switching transistor Q2; the resonant inductor L1, a primary coil of the output transformer T1 and the resonant capacitor C1 are connected in series and then are connected in parallel to the switching transistor Q2. The LLC resonant topology control circuit provided by the present disclosure has the characteristics of low cost and small volume.