Undervoltage Detection Circuit Using V-to-I Converter
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Solution Overview
Problem
Conventional undervoltage detection circuits have a large undefined region where they cannot properly provide an output, exhibiting significant dependence on process and temperature variations due to their reliance on bandgap circuits and comparators.
Innovation Solution
The proposed undervoltage detection circuit incorporates a voltage divider, a voltage-to-current (V-to-I) converter, and a current comparator, with designed V-to-I transfer functions and an undefined region limiter to generate a comparison signal indicating whether the supply voltage is sufficiently large, reducing dependence on process and temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional undervoltage detection circuit uses a bandgap circuit and comparator, then the circuit can detect undervoltage conditions, but the circuit exhibits large dependence on process and temperature variations and has a large undefined region
Solution Approach 1:
The patent changes the fundamental operating parameters of the detection circuit by using a V-to-I converter with specifically designed transfer functions instead of a bandgap circuit. The V-to-I converter transforms voltage comparisons into current comparisons, and by designing the transfer functions to have specific characteristics (such as operating in saturation region), the circuit achieves independence from process and temperature variations that plague conventional bandgap-based designs
Solution Approach 2:
The patent substitutes the conventional voltage-based comparison mechanism (bandgap circuit + voltage comparator) with a current-based comparison mechanism (V-to-I converter + current comparator). This substitution fundamentally changes how the undervoltage detection is performed, replacing the temperature-sensitive bandgap voltage reference with a current mirror-based system that is inherently more stable against process and temperature variations
2Reliability
If a conventional undervoltage detection circuit uses a bandgap circuit, then the circuit can provide undervoltage detection, but the undefined region is large
Solution Approach 1:
The patent changes the operational parameters by ensuring the V-to-I converter operates in its saturation region through proper biasing and transfer function design. This parameter change allows the converter to maintain a linear and predictable relationship between input voltage and output current over a wider range, thereby reducing the undefined region where the circuit cannot properly provide an output
Solution Approach 2:
The patent employs dynamic current mirroring mechanisms where the V-to-I converter actively adjusts its operating point based on the input voltage. The current mirror configuration dynamically scales the currents to maintain proper operation across a wider voltage range, reducing the undefined region compared to static bandgap-based designs
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
This design minimizes the undefined region and reduces dependence on process and temperature variations, ensuring reliable undervoltage detection across a wider range of supply voltages.
Implementation Method 1
The voltage divider is to receive a supply voltage, and divides the supply voltage to generate a divided voltage
Implementation Method 2
The V-to-I converter is coupled to the voltage divider to receive the divided voltage therefrom, and converts the divided voltage into a first current based on a first V-to-I transfer function
Data Source
AI summary
An undervoltage detection circuit includes a voltage divider, a voltage-to-current (V-to-I) converter and a current comparator. The voltage divider divides a supply voltage to generate a divided voltage. The V-to-I converter converts the divided voltage into a first current based on a first V-to-I transfer function, and converts the divided voltage into a second current based on a second V-to-I transfer function different from the first V-to-I transfer function. The current comparator compares the first and second currents to generate a comparison signal that indicates whether the supply voltage is sufficiently large.