Isolated Charger Control for Fast MOSFET Timing Feedback
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Solution Overview
Problem
Chargers face issues with slow driving speed and inaccurate dead time control due to limitations in communication between primary and secondary switch tubes, which affects the efficiency and flexibility of voltage and current regulation.
Innovation Solution
The integration of a microwave unit for transmitting control signals between control units, allowing for rapid and accurate control of primary and secondary switch tubes, enabling improved driving speed and dead time management while preventing circuit crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional control units are used to drive MOS tubes, then the charger can operate, but the driving speed is not fast enough and dead time cannot be accurately controlled
Solution Approach 1:
The patent divides the control function into separate control units for primary-side and secondary-side MOS tubes. Each control unit independently controls its respective side, enabling faster response times and more precise dead time control by eliminating the limitations of a single integrated control unit.
Solution Approach 2:
The patent introduces an isolation component (such as an optocoupler or transformer) as an intermediary between the primary-side control unit and secondary-side control unit. This intermediary enables fast signal transmission while providing electrical isolation, thus achieving both high driving speed and precise dead time control.
2Productivity
If traditional control architecture is used, then the structure is simple, but the communication between primary and secondary switch tubes is slow and inflexible
Solution Approach 1:
The control architecture is segmented into independent primary-side and secondary-side control units. This segmentation enables each unit to operate autonomously with faster local decision-making, improving overall communication speed while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent implements a feedback mechanism where the secondary-side control unit sends feedback signals about output voltage and current to the primary-side control unit. This feedback loop enables rapid adjustment and optimization of switching parameters, improving communication effectiveness and control precision.
3Productivity
If conventional control methods are used, then the implementation is straightforward, but the voltage and current regulation efficiency is reduced
Solution Approach 1:
The patent employs dual-sided feedback control where both primary-side and secondary-side parameters are monitored and fed back to their respective control units. This enables precise regulation of output voltage and current by dynamically adjusting switching duty cycles based on real-time conditions, significantly improving regulation efficiency.
Solution Approach 2:
The control system dynamically adjusts switching parameters based on real-time feedback from both primary and secondary sides. The control units can adaptively change duty cycles, frequency, and timing to optimize regulation efficiency under different operating conditions, transforming a static control system into a dynamic one.
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 solution enhances the speed and accuracy of control signals, allowing for efficient voltage and current regulation, and improves communication flexibility and security by isolating parasitic capacitance and enabling rapid two-way communication.
Implementation Method 1
a first microwave unit connected to the first control unit and the second control unit respectively and configured to transmit the feedback information to the first control unit
Data Source
AI summary
Provided are a charger and a control method. The charger includes: a transformer; at least one primary-side switch tube for carrying out chopping modulation on a voltage input into the transformer; a first control unit; a second control unit for generating feedback information on the basis of a voltage and/or current information output from an output end of the charger; and a first microwave unit respectively connected to the first control unit and the second control unit, and used for transmitting the feedback information to the first control unit. The first control unit is used for outputting a first control signal according to the feedback information, so as to control the turning on or the turning off of the at least one primary-side switch tube.