Temperature Compensated NTC Thermistor MF11

Temperature compensated thermistor MF11 is an electronic component that uses the characteristic that the resistance value changes with temperature to offset the performance fluctuations of other components in the circuit caused by temperature changes. It is mainly implemented using ‌Negative Temperature Coefficient (المجلس الوطني الانتقالي) Thermistor‌. The following are its core principles, applications and characteristics:

NTC thermistor temperature measurement MF11-103M 104M1~200K

MF11 Negative temperature coefficient high power compensation type 1K 10K 50K 100K

Temperature Compensation Mf11 Ntc Thermal Resistor Thermistor

أنا. Compensation Principle
‌Negative Temperature Coefficient Characteristics‌
The resistance value of the NTC thermistor decreases significantly with the increase of temperature, and its resistance-temperature relationship conforms to the formula:
ص(ت)=R0⋅eB⋅(1T−1T0)ص(ت)=R0​⋅eB⋅(T1​−T0​1​) (R0R0​ is the resistance value at the reference temperature T0T0​, and BB is the material constant).
Using this characteristic, the performance drift of positive temperature coefficient components (such as transistors and crystal oscillators) caused by temperature increase can be offset.

‌Compensation circuit design‌
‌Combined current compensation‌: By combining an NTC thermistor with a constant current source, a temperature-dependent compensation current is generated and injected into sensitive circuit nodes (such as the charge pump of a phase-locked loop) to stabilize key parameters.
‌Bridge or voltage divider circuit‌: NTC is embedded in the sensor circuit to offset the zero-point drift caused by temperature by adjusting the voltage divider ratio.

Active Compensation:
Thermistors can be used in active compensation circuits, where they act as a sensor to detect temperature changes and trigger corrective actions. This can involve adjusting a circuit’s parameters or controlling the output of a device to maintain desired performance.

Passive Compensation:
Thermistors can also be used in passive compensation circuits, where their resistance change is used to offset or cancel out the effects of temperature variations in a circuit. This is often achieved by placing the thermistor in series or parallel with other circuit components.

II. Examples of Thermistor Applications in Temperature Compensation:

‌Electronic Circuit Stability Compensation‌
Compensate for temperature drift of components such as transistors and crystal oscillators to maintain circuit operating stability.

مثال: In a crystal oscillator circuit, the decrease in NTC resistance can balance the frequency offset of the crystal oscillator as the temperature increases.

‌Sensor Accuracy Improvement‌
Used for linear compensation of temperature sensors such as platinum resistance (PT100) to reduce measurement errors.
Adjust the zero potential in magnetic field sensors (such as AD22151) to suppress the effects of high temperature coefficients.

‌Precision Instrument Temperature Control‌
Integrate in constant temperature systems or high-precision instruments (such as medical equipment) to achieve dynamic temperature calibration.
Brightness Control of LCD Displays:
Thermistors can be used to adjust the brightness of LCD displays, compensating for temperature-related changes in display characteristics.

Compensation for Resistance Changes in Moving Coil Instruments:
In moving coil instruments, thermistors can be used to compensate for the resistance changes in the moving coil due to temperature variations.

Temperature Compensation of Crystal Oscillators:
NTC thermistors can be used to compensate for the frequency drift of quartz crystal oscillators due to temperature changes.

ثالثا. Key Features and Selection Points

رابعا. Typical Technical Solutions
‌Mixed Current Compensation‌: على سبيل المثال, the patent CN120090626A solution injects a constant current and a temperature-controlled current (PTAT) into the charge pump in proportion to achieve accurate temperature compensation of the phase-locked loop and avoid overcompensation.
‌Voltage Divider Compensation‌: The thermistor is connected in series with an adjustable potentiometer to the op amp circuit to flexibly adjust the compensation amount, which is suitable for sensitive components with large drift.

Tips: When selecting a model, you need to match the B value range and packaging form. على سبيل المثال, for precision instruments, high B value (>3000ك) chip NTC is preferred, and glass-sealed type is used for high-temperature environments.