DC/DC Converter Microcomputer Stop Circuit
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Solution Overview
Problem
Existing DC/DC converters face challenges in safely and quickly stopping operations due to short reduction times of the regulator output, leading to incomplete data saving and increased chip size for power supply functions, especially when using commercial AC transformers which are large and inefficient.
Innovation Solution
A power conversion device with a microcomputer-controlled output circuit that includes an internal power source and a microcomputer stop transition unit, allowing for controlled shutdown by stepping down the switching output voltage and optimizing voltage resistance to reduce chip size and enable quick and safe operation stops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the time taken for the output of the regulator to start to be reduced is increased to ensure complete data saving, then the reliability of stop processing is improved, but the speed of stopping the DC/DC converter operation deteriorates
Solution Approach 1:
The stop processing is divided into two independent stages: first the microcomputer stops operation and saves data, then the regulator output is stepped down. This segmentation allows each stage to be optimized independently, resolving the contradiction between ensuring data saving completion and achieving quick stop.
Solution Approach 2:
The microcomputer is caused to stop operation and perform data saving before the regulator output is stepped down. This preliminary action ensures that data saving is completed while the microcomputer still has power, eliminating the need to extend the regulator step-down time for reliability purposes.
2Loss of energy
If a commercial AC transformer is used to reduce regulator loss, then the efficiency is improved, but the chip size increases
Solution Approach 1:
The transformer function is extracted from the traditional external commercial AC transformer and integrated directly into the chip as an on-chip transformer. This eliminates the need for large external transformers while maintaining the efficiency benefits of voltage transformation before regulation.
Solution Approach 2:
Multiple functions (power conversion, voltage transformation, and regulation) are merged into a single integrated chip structure. The on-chip transformer combines the voltage transformation function with the regulator, eliminating separate external components and reducing overall chip size.
Data Source
AI summary
A power conversion device according to one or more embodiments may include: a microcomputer; and an output circuit controlled by the microcomputer, including an output unit that converts an input power into a predetermined power and outputs the predetermined power, an internal power source that supplies a power source to the microcomputer, a driver that drives the output unit by a signal from the microcomputer, and a microcomputer stop transition unit that, when an operation of the power conversion device is stopped, outputs a microcomputer stop signal to the microcomputer and causes an operation of the microcomputer to transition to a stop state. In one or more embodiments, after the microcomputer stop transition unit causes the operation of the microcomputer to transition to a stop state, the microcomputer or the output circuit may stop an output of the internal power source.