Switching Control Circuit for Non-Isolated and Isolated Power Supplies
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Solution Overview
Problem
Existing power supply circuits face challenges in using a common control circuit for both non-isolated and isolated types, as the methods for detecting output voltage differ significantly between these two types, making it difficult to develop a unified control solution.
Innovation Solution
A switching control circuit that includes error voltage output circuits and a drive circuit, capable of distinguishing between non-isolated and isolated power supply circuits based on feedback voltages and signals, allowing it to switch transistors accordingly to maintain output voltage levels in both types of circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different detection methods are used for non-isolated and isolated power supply circuits, then output voltage detection can be achieved for each type, but the control circuit cannot be used in common for both types
Solution Approach 1:
The control circuit is designed with dual functionality to work with both non-isolated and isolated power supply circuits. The circuit includes a first error voltage output circuit for non-isolated circuits and a second error voltage output circuit for isolated circuits, allowing a single control circuit to serve multiple purposes and eliminate the need for separate control circuits for each power supply type.
Solution Approach 2:
The control circuit dynamically changes its operating parameters based on the detected power supply type. When a non-isolated power supply is detected, the first error voltage output circuit is activated; when an isolated power supply is detected, the second error voltage output circuit is activated. This parameter switching enables the same hardware circuit to adapt to different detection requirements.
2Adaptability or versatility
If a single control circuit is designed to support both non-isolated and isolated power supply circuits, then circuit versatility is improved, but the circuit configuration becomes more complex
Solution Approach 1:
The error voltage output functionality is extracted into separate dedicated circuits - a first error voltage output circuit for non-isolated power supplies and a second error voltage output circuit for isolated power supplies. This extraction allows each circuit to be optimized for its specific function while being managed by a unified control structure that selects which circuit to activate based on the power supply type.
Data Source
AI summary
A switching control circuit for controlling a power supply circuit that includes an inductor to which an input voltage is applied and through which an inductor current flows, and a transistor configured to control the inductor current. The switching control circuit includes first and second error voltage output circuits that output first and second error voltages, based respectively on a feedback voltage corresponding to the output voltage and a reference voltage, and on an error signal corresponding to a difference between the level of the output voltage and a second level, when the power supply circuit is of a non-isolated type and an isolated type, respectively. The switching control circuit further includes a drive circuit that switches the transistor based on the inductor current, and on the first and second error voltage when the power supply circuit is of the non-isolated type and an isolated type, respectively.