Bridge Sensor Signal Detection Circuit Using Capacitor Discharge Timing
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Solution Overview
Problem
The high cost of high precision analog to digital (A/D) converters required for bridge circuit sensors poses a significant challenge in effectively detecting signals produced by these sensors, as they are expensive and may not be feasible for all electronic devices.
Innovation Solution
A detection circuit comprising a processing unit, amplifier circuit, discharge switch, rechargeable unit, reference voltage providing circuit, and comparators is designed to amplify and process signals from bridge circuit sensors, utilizing a rechargeable unit and comparators to calculate the output voltage and obtain the signals produced by the bridge circuit sensor, thereby reducing the need for expensive A/D converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high precision analog to digital (A/D) converter is used to detect signals from bridge circuit sensor, then detection precision is improved, but device cost increases
Solution Approach 1:
The patent replaces expensive high precision A/D converters with a combination of ordinary A/D converter and rechargeable unit. The system uses a discharge switch to control charged capacitor voltage, allowing ordinary components to achieve precision measurements through clever circuit design rather than relying on expensive high-precision components.
Solution Approach 2:
The patent changes the voltage parameter of the charged capacitor dynamically during measurement. By controlling the discharge switch to adjust capacitor voltage, the system adapts the reference voltage level to match the signal range, enabling precise measurement with ordinary components through parameter adjustment rather than requiring expensive fixed high-precision components.
2Measurement precision
If an amplifier and high precision A/D converter are used for bridge circuit sensor, then signal detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent simplifies the circuit by replacing complex high precision A/D converter with ordinary A/D converter plus rechargeable unit. The discharge switch-controlled capacitor system provides the necessary precision function using simpler, more common components, reducing overall circuit complexity while maintaining measurement accuracy.
3Measurement precision
If high precision A/D converter is used, then signal detection capability is improved, but cost-effectiveness deteriorates
Solution Approach 1:
The patent achieves cost-effective signal detection by using ordinary A/D converter combined with rechargeable unit and discharge switch control. This approach replaces expensive high precision A/D converter with cheaper common components, maintaining detection capability while significantly improving cost-effectiveness for electronic devices.
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 solution allows for the efficient detection of signals from bridge circuit sensors without the necessity of high precision A/D converters, providing a cost-effective and functional alternative for electronic devices.
Implementation Method 1
a rechargeable unit 40, a reference voltage providing circuit 50, a first comparator 60, a second comparator 70
Implementation Method 2
an amplifier circuit 20, a discharge switch 30, a rechargeable unit 40
Implementation Method 3
a first comparator 60, a second comparator 70, a first resistor R1, and a second resistor R2
Data Source
AI summary
A detection circuit includes an amplifier circuit, a rechargeable unit, a first comparator, a second comparator, a reference voltage providing circuit, a first resistor R1, a second resistor R2, and a processing unit. The amplifier circuit is connected to a bridge circuit sensor and amplifies signals output by the bridge circuit sensor to an output voltage Vo. The reference voltage providing circuit provides a reference voltage Vref1. A charge current of the rechargeable unit is (Vref1−V0)/(R1+R2), and a discharge current is (Vref1−VCC)/R1. The processing unit controls the rechargeable unit to be charged for a time period T1 and to be discharged during a time period T2. The processing unit then calculates the output voltage Vo according to an equation: (Vref1−V0)×T1/(R1+R2)=(Vref1−VCC)×T2/R1, and obtains the signals according to the output voltage Vo.