Primary Side Regulated Isolation Converter Ripple Control
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Solution Overview
Problem
Existing secondary side regulated isolation voltage converters require a large number of components, leading to high power consumption, low efficiency, and high costs, due to the need for an optical coupler for sampling secondary side current or voltage signals.
Innovation Solution
A primary side regulated isolation voltage converter design that uses a storage element with a tertiary winding to generate a voltage feedback signal, a controllable switch, a control module to determine light load states, a ripple control circuit to sense output voltage ripples, and a logic circuit to manage switching based on feedback signals, reducing the need for an optical coupler and minimizing components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If secondary side regulated isolation voltage converter uses optical coupler for sampling secondary side current or voltage signal, then precise control of voltage or current is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent extracts and removes the optical coupler from the feedback system, replacing it with a direct primary side voltage sampling approach. The tertiary winding directly provides feedback voltage to the control module without requiring optical isolation, thereby simplifying the structure while maintaining control precision through alternative measurement methods
Solution Approach 2:
The patent introduces a tertiary winding as an intermediary element that couples the secondary output voltage to the primary control circuit through magnetic induction. This mediator allows voltage feedback without direct electrical connection or optical coupling, achieving both isolation and simplified feedback path
2Measurement precision
If secondary side regulated isolation voltage converter uses optical coupler for signal sampling, then voltage control precision is improved, but power consumption increases
Solution Approach 1:
The optical coupler is removed from the system, eliminating its power consumption requirements. The primary side voltage sampling circuit draws minimal power from the input voltage source, significantly reducing overall power consumption while maintaining adequate control precision for the application
3Measurement precision
If secondary side regulated isolation voltage converter uses optical coupler for signal sampling, then voltage control precision is improved, but manufacturing cost increases
Solution Approach 1:
The expensive optical coupler is extracted and removed from the design. The replacement primary side sampling circuit uses standard electronic components that are much cheaper and easier to manufacture, thereby significantly reducing bill of materials cost and assembly complexity while achieving acceptable control precision
Solution Approach 2:
The patent replaces the expensive, complex optical coupler with a simple, inexpensive primary side voltage sampling circuit using basic electronic components. This substitution prioritizes cost-effectiveness over maximum precision, suitable for applications where moderate precision suffices
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 design improves efficiency and reduces costs by enabling precise voltage control without the need for an optical coupler, while maintaining stability and efficiency in high-security adapter and charger applications.
Implementation Method 1
a tertiary winding configured to induct an output voltage signal of the isolation voltage converter to generate a voltage feedback signal
Data Source
AI summary
A primary side regulated isolation voltage converter. The primary side regulated isolation voltage converter comprises a control module and a ripple control circuit. The control module receives the voltage feedback signal and determines whether the isolation voltage converter operates in a light load state. When the isolation voltage converter operates in a light load state, the ripple control circuit senses the ripple of an output voltage signal to generate a ripple signal, and compare the ripple signal with a ripple threshold. When the ripple signal is larger than the ripple threshold, the isolation voltage converter jumps out the light load state.