Battery Voltage Detection Circuit With Adjustable Lower Range
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Solution Overview
Problem
Conventional voltage detectors have a large resolution in voltage detection due to a fixed lower limit of 0 V, leading to inaccuracies in detecting voltage fluctuations within a range of 5 V to 25 V, resulting in errors between analog and digital detection values.
Innovation Solution
A voltage detector with a first resistor and an output circuit that maintains a predetermined voltage at one end of the first resistor, allowing the detection value to be adjusted by adjusting the lower limit of the target voltage detection range to exceed 0 V, using a PNP bipolar transistor and a diode to ensure accurate current matching and minimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lower limit of the voltage detection range is fixed at 0 V, then the device structure is simple, but the voltage detection resolution becomes large leading to inaccuracies
Solution Approach 1:
The patent changes the parameter of the lower limit voltage from fixed 0 V to an adjustable value. By making the lower limit voltage a variable parameter that can be set according to the actual voltage range, the detection resolution is improved without significantly complicating the overall device structure.
Solution Approach 2:
The patent introduces dynamic adjustability to the detection range lower limit. Instead of a static 0 V reference, the system allows the lower limit to be dynamically changed based on the application requirements, enabling optimal resolution for different voltage ranges while maintaining circuit simplicity.
2Measurement precision
If voltage division is used to map target voltage to input range, then the circuit implementation is straightforward, but the detection resolution deteriorates
Solution Approach 1:
The patent modifies the detection range parameters to match the actual voltage fluctuation range. By adjusting the lower and upper limits of the detection range to correspond to the minimum and maximum target voltages, the system achieves high resolution without complex circuit modifications.
Solution Approach 2:
The system dynamically adapts the detection range to the actual voltage conditions. The lower limit voltage is adjusted based on the minimum target voltage, creating a dynamic detection range that optimizes resolution for the specific application while maintaining straightforward circuit implementation.
3Measurement precision
If the input range is set to cover the full fluctuation range, then the detection coverage is complete, but the resolution becomes coarse
Solution Approach 1:
The patent changes the detection range parameters to exactly match the actual voltage fluctuation range. By setting the lower limit to the minimum target voltage and the upper limit to the maximum target voltage, the system achieves fine resolution across the entire detection range while maintaining complete coverage of the voltage fluctuations.
Data Source
AI summary
A voltage detector detects a voltage of a positive electrode of a battery, and outputs a detection value indicating a detected voltage value. A target voltage to be detected is applied to one end of a resistor, via a first switch. A current is input to an output circuit from the other end of the resistor. The output circuit outputs a current whose current value substantively coincides with the current value of the current input from the resistor to one end of a resistor, while maintaining a voltage value of the other end of the resistor substantively at a predetermined voltage value. A voltage value of the one end of the resistor is output to a microcomputer as the detection value.