A resistance measurement circuit
By using the 74HC04 chip in the resistance measurement circuit to provide 180° phase shift and varistor protection, the measurement error problem caused by the self-heating effect of platinum resistance thermometers is solved, thus achieving accuracy and stability in resistance measurement and extending the service life of the circuit.
CN224436451UActive Publication Date: 2026-06-30BEIJING QUNLING ENERGY TECH CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING QUNLING ENERGY TECH CO LTD
- Filing Date
- 2025-07-21
- Publication Date
- 2026-06-30
AI Technical Summary
Technical Problem
In temperature sensors, the resistance value of platinum resistance thermometers decreases in measurement accuracy due to the self-heating effect, a problem that is difficult to solve effectively with existing technologies.
Method used
A resistance measurement circuit is adopted, which uses a 74HC04 chip as an inverter to provide a 180° phase shift. The resistance value is measured by a square wave signal, and the inverter is protected by a varistor to reduce self-heating effect and damage under abnormal conditions.
Benefits of technology
It improves the accuracy and stability of resistance measurement, extends the service life of the measurement circuit, and reduces the risk of errors and damage.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN224436451U_ABST
Abstract
This utility model relates to a resistance measurement circuit, belonging to the field of resistance measurement technology. It includes an interface terminal, specifically a J2 terminal, a fourth capacitor, a fourteenth resistor, and an inverter. The inverter is a 74HC04 chip. Pin 1 of the inverter is electrically connected to one end of the fourteenth resistor. Pins 4 and 5 of the inverter are both electrically connected to one end of the fourth capacitor. The other end of the fourteenth resistor, the other end of the fourth capacitor, and pin 1 of the interface terminal are all used to connect to one end of the resistor under test. Pins 2 and 3 of the inverter and pin 2 of the interface terminal are all used to connect to the other end of the resistor under test. Pin 6 of the inverter is the output terminal, pin 7 of the inverter is grounded, and pin 14 of the inverter is connected to a 3.3V power supply. This application facilitates the measurement of resistance values.
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