Integrated Switching Power Supply Control Circuit for Reliability
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Solution Overview
Problem
Conventional switching power supply systems are complex, costly, and have low reliability due to numerous components, making it difficult to achieve accurate output voltage control and primary current detection.
Innovation Solution
A highly integrated control circuit for a switching power supply system that includes a power switch transistor, primary current sampling module, voltage stabilization control module, and power supply startup module, which samples primary current, generates feedback signals, and controls the transformer's conduction and disconnection to maintain constant output voltage without external components like feedback resistors and diodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional switching power supply system with multiple external components is used, then system functionality is complete, but system complexity and component count increase
Solution Approach 1:
The patent integrates multiple previously external components (feedback resistors, startup resistors, current sampling resistors, protection diodes) directly into the control circuit chip. This merging eliminates the need for separate external components, reducing system complexity while maintaining complete functionality and improving reliability through fewer connection points and components.
Solution Approach 2:
The control circuit chip is designed to perform multiple functions simultaneously: voltage feedback detection, current sampling, startup power supply, and protection functions. This multi-functionality consolidates what previously required multiple separate components into a single integrated unit, addressing the contradiction between completeness and complexity.
2Measurement precision
If multiple external components are used for feedback and current sampling, then detection accuracy is achieved, but manufacturing cost increases
Solution Approach 1:
The patent integrates feedback resistors, startup resistors, and current sampling resistors within the control circuit chip structure. This eliminates the need for separate external resistor components and their associated mounting, wiring, and assembly processes, reducing manufacturing cost while maintaining detection accuracy through precise internal resistor implementation.
3Reliability
If conventional peripheral components are used, then system robustness is improved, but system cost increases
Solution Approach 1:
The patent consolidates multiple protective and functional components into the control circuit chip, including integrated feedback resistors, startup resistors, and protection diodes. This reduction in component count decreases the bill of materials cost and assembly complexity while maintaining system robustness through the integrated design.
Solution Approach 2:
The patent extracts and eliminates unnecessary external peripheral components by integrating their functions directly into the control circuit chip. This extraction removes components that add cost and complexity without providing additional functional value, as the integrated chip provides equivalent or superior performance.
4Measurement precision
If external feedback resistors and current sampling resistors are used, then voltage and current detection is accurate, but system assembly complexity increases
Solution Approach 1:
The patent integrates feedback resistors and current sampling resistors within the control circuit chip, eliminating the need for separate external resistor components. This integration simplifies assembly by reducing the number of components to be mounted and wired, while maintaining accurate voltage and current detection through precisely fabricated internal resistors.
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 simplifies the system, reduces component count, improves reliability, and achieves efficient constant voltage control by accurately detecting primary current and output voltage, while enabling faster startup and stable performance.
Implementation Method 1
a transformer, the transformer includes a primary winding, a secondary winding and an auxiliary winding
Data Source
AI summary
A highly integrated switching power supply and a control circuit are provided. The switching power supply includes a transformer, the transformer comprises a primary winding, a secondary winding and an auxiliary winding, and the control circuit includes: a power switch transistor, configured to control disconnection and conduction of the primary winding of the transformer; a primary current sampling module, configured to sample a current of the primary winding to generate a sampling voltage; and a voltage stabilization control module, configured to turn on or turn off the power switch transistor according to an input voltage, an output voltage of the switching power supply system, and the sampling voltage.