Level Shifter Circuit for Multi-Voltage Input Compatibility
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Solution Overview
Problem
Conventional level shift devices require separate units 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 to convert external input signals into a compatible Hi/Lo signal, using a DMOS and comparator to manage voltage differences and ensure compatibility with various power systems.
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 correctly, but the number of components increases and board area increases
Solution Approach 1:
The patent implements a single level shift device that can handle multiple voltage systems (5V and 12V) by using a high breakdown voltage element as the switching element. This universal device replaces multiple dedicated level shift devices, reducing component count while maintaining compatibility with different voltage systems through a unified architecture that includes voltage detection circuitry and appropriate switching element selection
2Reliability
If separate level shift devices are used for different voltage systems, then each device can be optimized for its specific voltage, but board area increases
Solution Approach 1:
The patent merges multiple dedicated level shift devices into a single integrated device that can handle both 5V and 12V systems. By combining the functionality of separate devices into one unit with a high breakdown voltage element and voltage detection circuitry, the board area required is reduced from the sum of multiple discrete devices to a single compact integrated circuit
3Reliability
If separate level shift devices are used for different voltage systems, then each device can be optimized for its specific voltage, but component cost increases
Solution Approach 1:
The patent creates a universal level shift device that can operate with multiple voltage systems (5V and 12V) through the use of a high breakdown voltage element and voltage detection circuitry. This single multi-functional device reduces component costs by eliminating the need to purchase and stock multiple different level shift devices for different voltage systems, thereby reducing overall component expenditure and simplifying supply chain management
Data Source
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.