Low Power Voltage Detection Circuit Using JFET Decoupling
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Solution Overview
Problem
Existing voltage detection circuits in the semiconductor industry face challenges in achieving low power dissipation while maintaining accurate detection of the lower threshold value of input voltage, with prior solutions either consuming high power or lacking precision.
Innovation Solution
A voltage detection circuit is designed with a threshold voltage detection mechanism that minimizes power consumption by decoupling power from the input voltage when it's below a certain threshold, using a combination of JFET transistors and a comparator with hysteresis, allowing for accurate detection only when the input voltage exceeds this threshold, thereby reducing power dissipation and enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If prior UVLO circuits are used to detect input voltage threshold, then voltage detection function is achieved, but power dissipation is high and approximately equal when input voltage is below or above the desired operating value
Solution Approach 1:
The circuit dynamically changes its operational state based on the input voltage level. When the input voltage exceeds the threshold, the circuit transitions to a low-power state by decoupling the power consumption of the detection circuitry, thereby reducing power dissipation while maintaining detection accuracy
Solution Approach 2:
The circuit changes the power consumption parameter based on the detected voltage condition. By using transistors to control the power supply to different circuit blocks, the power dissipation parameter is dynamically adjusted - high power is consumed only when needed for accurate detection, and low power is consumed when the voltage threshold is already satisfied
2Measurement precision
If voltage detection circuit operates continuously to maintain accurate detection, then detection accuracy is maintained, but power dissipation increases
Solution Approach 1:
Instead of continuous operation, the circuit employs periodic or conditional operation. The detection circuitry is activated only when the input voltage exceeds the threshold value, creating a periodic activation pattern that reduces overall power dissipation while maintaining detection accuracy during critical periods
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
The circuit achieves low power consumption of about one micro-ampere when the input voltage is below the threshold and one hundred micro-amps when above, providing accurate detection with reduced power dissipation and increased accuracy compared to prior solutions.
Implementation Method 1
a comparator with hysteresis
Data Source
AI summary
In one embodiment, a low power voltage detection circuit includes a first voltage detection device that receives power from an input voltage and a second voltage detection device receives power from an output of the low power voltage detection circuit.