Level Shift Circuit Using DMOS and Comparator for Multi-Voltage Inputs
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Solution Overview
Problem
Conventional level shift devices require separate implementations for different voltage systems, such as 5V and 12V, limiting compatibility and increasing component costs and board area.
Innovation Solution
A level shift device incorporating a high breakdown voltage element, a comparator, and an internal power supply part that converts external input signals into a compatible intermediate signal, allowing operation across various voltage systems using a DMOS and comparator configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate level shift devices are used for different voltage systems (5V and 12V), then each voltage system can be handled appropriately, but the number of components increases and board area expands
Solution Approach 1:
The patent implements a universal level shift device that can handle multiple voltage systems (5V, 12V, and other voltages) through a single integrated circuit. The high breakdown voltage element and configurable power supply circuitry enable the device to adapt to different input voltage levels, eliminating the need for separate level shift devices for each voltage system and thereby reducing board area.
Solution Approach 2:
The patent combines multiple level shift functions for different voltage systems into a single integrated circuit device. By merging the functionality of what would traditionally require separate 5V-level and 12V-level level shift devices into one unit, the patent reduces the total component count and board area while maintaining compatibility with multiple voltage systems.
2Reliability
If separate level shift devices are used for different voltage systems, then each system is optimized, but component costs increase
Solution Approach 1:
The patent creates a universal level shift device that serves multiple voltage systems simultaneously, allowing manufacturers to produce a single type of component rather than multiple specialized devices. This universality reduces per-unit costs through economies of scale in manufacturing and simplifies inventory management, thereby reducing overall component costs while maintaining voltage system compatibility.
Solution Approach 2:
By merging multiple level shift functions into a single integrated circuit, the patent reduces the total bill of materials cost. The consolidated design allows for fewer components to be purchased, stored, and assembled, directly reducing component costs while maintaining the ability to handle different voltage systems.
3Adaptability or versatility
If a high breakdown voltage element is used to handle multiple voltage systems, then voltage system compatibility is achieved, but device complexity increases
Solution Approach 1:
The patent introduces an internal power supply circuit as an intermediary that mediates between the high breakdown voltage input signals and the low breakdown voltage internal circuitry. This intermediary power supply circuit converts or regulates the input voltage to appropriate levels for internal operation, allowing the device to handle multiple voltage systems while keeping the internal logic circuits simple and manageable.
Solution Approach 2:
The patent utilizes parameter changes in the power supply voltage to adapt the device's operating characteristics. By dynamically adjusting or selecting power supply voltage parameters based on the input voltage level, the device achieves versatility across different voltage systems while maintaining simple internal circuit design through parameter adaptation rather than structural complexity.
Data Source
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AI summary
A level shift device includes a high breakdown voltage element in which a voltage of an internal power supply part is applied to a gate, an external input signal is input from outside to one of a source and a drain, and the other one of the source and the drain outputs an intermediate output signal of the same phase as that of the external input signal, and a comparator comparing the intermediate output signal with a threshold value so as to perform conversion into a Hi/Lo signal defined by a voltage of the internal power supply part and outputting the signal to an internal processing circuit. The high breakdown voltage element, the comparator, the processing circuit, and the internal power supply part are enclosed in the device.