A temperature compensation circuit based on time and ambient temperature

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By using a two-stage control circuit based on time and ambient temperature, and utilizing a heating power supply and control circuit, the problem of difficult startup of integrated circuits under low temperature conditions is solved, thereby improving the performance and expanding the temperature adaptability of electronic products in low-temperature environments.

CN224536403UActive Publication Date: 2026-07-21SHAANXI BAOCHENG AVIATION INSTR

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: SHAANXI BAOCHENG AVIATION INSTR
Filing Date: 2025-07-16
Publication Date: 2026-07-21

AI Technical Summary

Technical Problem

Some electronic components, especially integrated circuits, have difficulty starting up and their performance degrades under low-temperature conditions.

Method used

A two-stage control circuit based on time and ambient temperature is adopted. Temperature compensation is achieved through a combination of relays and transistors via a heating power supply, control circuit, and heater. The circuit includes an operational amplifier, a thermistor, a voltage divider circuit with resistors, and a negative feedback comparator for temperature control.

Benefits of technology

It improves the startup and operation performance of electronic circuits and integrated circuits under low-temperature conditions, expands the temperature adaptability range of products, and enables flexible temperature compensation adjustment.

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Abstract

The utility model provides a kind of temperature compensation circuit based on time and ambient temperature, comprising: heating power supply, control circuit and heater, the heating power supply is connected with the heater by relay K1 and K2;The control circuit includes first control unit and second control unit.The utility model provides a kind of temperature compensation circuit based on time and ambient temperature, realizes the temperature compensation of electronic circuit and integrated circuit by two-stage control based on time and ambient temperature, realizes the control of temperature by negative feedback comparison circuit, can better improve the low-temperature start and working performance of circuit and device, ensure the temperature application range of product, use hardware circuit to realize, simple and reliable, can flexibly adjust start working time and set low-temperature working temperature, wide in use.

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Description

Technical Field

[0001] This utility model relates to the field of electronic circuits, and in particular to a temperature compensation circuit based on time and ambient temperature. Background Technology

[0002] With the widespread application of electronic products, the scope of product use is expanding, and the environmental temperature requirements are becoming increasingly stringent, demanding that products be able to adapt to a wide operating temperature range.

[0003] However, some electronic components, especially integrated circuits, have poor low-temperature operating capabilities, making it difficult to start up under low-temperature conditions and resulting in performance degradation during operation.

[0004] Therefore, it is necessary to provide a temperature compensation circuit based on time and ambient temperature to solve the above-mentioned technical problems. Utility Model Content

[0005] This invention provides a temperature compensation circuit based on time and ambient temperature, which solves the problem of performance degradation of electronic products during low-temperature start-up and low-temperature operation.

[0006] To solve the above-mentioned technical problems, this utility model provides a temperature compensation circuit based on time and ambient temperature, comprising:

[0007] The system includes a heating power supply, a control circuit, and a heater. The heating power supply is connected to the heater via relays K1 and K2. The control circuit includes a first control unit and a second control unit.

[0008] Preferably, the first control unit includes an operational amplifier U1A, a transistor Q1, resistors R1, R2, R3, R4, and R5, a capacitor C1, and a diode V1. One end of resistor R1 is connected to the heating power supply, and the other end is connected to the relay K1. Pin 2 of the operational amplifier U1A is connected to one end of resistor R2 and capacitor C1, and the other end of capacitor C1 is grounded. Pin 3 of the operational amplifier U1A is connected to resistor R3 and resistor R4, and the other end of resistor R4 is grounded. Pin 1 of the operational amplifier U1A is connected to resistor R5 and then to the base of transistor Q1. The emitter of transistor Q1 is grounded. The negative terminal of diode V1 is connected to a -5V power supply, and the positive terminal is connected to pin 2 of the operational amplifier U1A.

[0009] Preferably, the second control unit includes an operational amplifier U1B, a transistor Q2, a thermistor RT1, resistors R6, R7, R8, and R9. One end of the thermistor RT1 is connected to a -5V power supply, and the other end is connected to pin 6 of the operational amplifier U1B. Pin 5 of the operational amplifier U1B is connected to resistors R7 and R8. The other end of resistor R8 is grounded. Pin 7 of the operational amplifier U1B is connected to resistor R9 and then to the base of transistor Q2. The emitter of transistor Q2 is grounded.

[0010] Preferably, the relay K2 is used to control the on / off state of the grounding circuit of the heater.

[0011] Preferably, both transistor Q1 and transistor Q2 are BTS555I type transistors.

[0012] Preferably, the thermistor MF51-3000-1k has a corresponding resistance value at a specific temperature for temperature detection.

[0013] Preferably, the relay K1 is used to control the connection between the heating power supply and the heater.

[0014] Compared with related technologies, the temperature compensation circuit based on time and ambient temperature provided by this utility model has the following beneficial effects:

[0015] This invention provides a temperature compensation circuit based on time and ambient temperature. Through two-level control based on time and ambient temperature, it realizes temperature compensation for electronic circuits and integrated circuits. Temperature control is achieved through a negative feedback comparison circuit. It can effectively improve the low-temperature start-up and working performance of circuits and devices, and ensure the temperature application range of the product. It is implemented using hardware circuit, which is simple and reliable. It can flexibly adjust the start-up working time and set the low-temperature working temperature, and has a wide range of applications. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a preferred embodiment of a temperature compensation circuit based on time and ambient temperature provided by this utility model. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] First Embodiment

[0019] Please refer to the following: Figure 1 ,in, Figure 1A schematic diagram of a preferred embodiment of a time- and ambient temperature-based temperature compensation circuit provided by this utility model. The time- and ambient temperature-based temperature compensation circuit includes:

[0020] The system includes a heating power supply, a control circuit, and a heater. The heating power supply is connected to the heater via relays K1 and K2. The control circuit includes a first control unit and a second control unit.

[0021] The first control unit includes an operational amplifier U1A, a transistor Q1, resistors R1, R2, R3, R4, and R5, a capacitor C1, and a diode V1. One end of resistor R1 is connected to the heating power supply, and the other end is connected to the relay K1. Pin 2 of the operational amplifier U1A is connected to one end of resistor R2 and capacitor C1, and the other end of capacitor C1 is grounded. Pin 3 of the operational amplifier U1A is connected to resistor R3 and resistor R4, and the other end of resistor R4 is grounded. Pin 1 of the operational amplifier U1A is connected to resistor R5 and then to the base of transistor Q1. The emitter of transistor Q1 is grounded. The negative terminal of diode V1 is connected to a -5V power supply, and the positive terminal is connected to pin 2 of the operational amplifier U1A.

[0022] The second control unit includes an operational amplifier U1B, a transistor Q2, a thermistor RT1, resistors R6, R7, R8, and R9. One end of the thermistor RT1 is connected to a -5V power supply, and the other end is connected to pin 6 of the operational amplifier U1B. Pin 5 of the operational amplifier U1B is connected to resistors R7 and R8. The other end of resistor R8 is grounded. Pin 7 of the operational amplifier U1B is connected to resistor R9 and then to the base of transistor Q2. The emitter of transistor Q2 is grounded.

[0023] The relay K2 is used to control the on / off state of the grounding circuit of the heater.

[0024] Both transistor Q1 and transistor Q2 are BTS555I type transistors.

[0025] The thermistor MF51-3000-1k has a corresponding resistance value at a specific temperature for temperature detection.

[0026] The relay K1 is used to control the connection between the heating power supply and the heater.

[0027] Please refer to the following: Figure 1It is understood that the voltage divider circuit composed of resistors R3 and R4 has a comparison voltage of 5*R4 / (R3+R4) at the positive input terminal of the comparator. The power-on integrating circuit composed of resistor R2, capacitor C1, and diode V1 charges capacitor C1 through resistor R2 after the circuit is powered on, with a charging time constant τ=R2*C1. Before the voltage on capacitor C1 reaches the comparison voltage, the comparator U1 outputs a high level to drive the current amplification transistor Q1 to conduct because the voltage at the reverse input terminal is less than the voltage at the positive input terminal. This causes the power-on heating control relay K1 to engage, and the entire heating power supply voltage is applied to the heater for full-speed heating.

[0028] The ambient temperature monitoring is composed of comparator U1B and peripheral circuits. The voltage divider circuit composed of thermistor RT1 and R6 forms the monitoring voltage, and the voltage divider circuit composed of R7 and R8 forms the comparison voltage. Due to the negative temperature characteristic of thermistor, the resistance value decreases as the ambient temperature rises. Therefore, when the ambient temperature is lower than a certain value, the positive input voltage of the comparator is greater than the negative input voltage, the comparator outputs a high level to drive the current amplification transistor Q2 to conduct, the ambient temperature control relay K2 is energized, and the heating power supply is applied to the heater for heating.

[0029] Adjusting the voltage division ratio of resistors R3 and R4 can adjust the power-on heating time, while adjusting the voltage division ratio of resistors R7 and R8 can adjust the ambient temperature monitoring value. The corresponding time and temperature values can be flexibly set according to different requirements.

[0030] Product startup compensation in low-temperature environments: Since the product temperature is the same as the ambient temperature in low-temperature environments, it can reach -50℃ to -60℃ under extreme conditions. Some integrated circuits have difficulty starting under these conditions, so they need to be heated quickly. However, the heating time should not be too long to avoid overheating of the circuit after startup.

[0031] After the product is started up, the circuit itself does not require high temperature compensation after it is working normally. When the temperature rise generated during normal operation is insufficient to offset the temperature difference of the ambient temperature, the temperature of the device will gradually decrease, and the performance will also decrease. Therefore, a small current compensation circuit was designed.

[0032] The two-stage control loops are cascaded in series to control the operating current and operating time of the heating device.

[0033] The start-up heating time can be adjusted by adjusting the resistance and capacitance values of the time integrator.

[0034] The activation temperature for ambient temperature compensation is adjusted by adjusting the comparison value of the temperature sensor.

[0035] Compared with related technologies, the temperature compensation circuit based on time and ambient temperature provided by this utility model has the following beneficial effects:

[0036] This invention provides a temperature compensation circuit based on time and ambient temperature. Through two-level control based on time and ambient temperature, it realizes temperature compensation for electronic circuits and integrated circuits. Temperature control is achieved through a negative feedback comparison circuit. It can effectively improve the low-temperature start-up and working performance of circuits and devices, and ensure the temperature application range of the product. It is implemented using hardware circuit, which is simple and reliable. It can flexibly adjust the start-up working time and set the low-temperature working temperature, and has a wide range of applications.

[0037] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A temperature compensation circuit based on time and ambient temperature, characterized in that, include: The system includes a heating power supply, a control circuit, and a heater. The heating power supply is connected to the heater via relays K1 and K2. The control circuit includes a first control unit and a second control unit. The first control unit includes an operational amplifier U1A, a transistor Q1, resistors R1, R2, R3, R4, and R5, a capacitor C1, and a diode V1. One end of resistor R1 is connected to the heating power supply, and the other end is connected to the relay K1. Pin 2 of the operational amplifier U1A is connected to one end of resistor R2 and capacitor C1, and the other end of capacitor C1 is grounded. Pin 3 of the operational amplifier U1A is connected to resistor R3 and resistor R4, and the other end of resistor R4 is grounded. Pin 1 of the operational amplifier U1A is connected to resistor R5 and then to the base of transistor Q1. The emitter of transistor Q1 is grounded. The negative terminal of diode V1 is connected to a -5V power supply, and the positive terminal is connected to pin 2 of the operational amplifier U1A. The second control unit includes an operational amplifier U1B, a transistor Q2, a thermistor RT1, resistors R6, R7, R8, and R9. One end of the thermistor RT1 is connected to a -5V power supply, and the other end is connected to pin 6 of the operational amplifier U1B. Pin 5 of the operational amplifier U1B is connected to resistors R7 and R8. The other end of resistor R8 is grounded. Pin 7 of the operational amplifier U1B is connected to resistor R9 and then to the base of transistor Q2. The emitter of transistor Q2 is grounded.

2. The temperature compensation circuit based on time and ambient temperature according to claim 1, characterized in that, The relay K2 is used to control the on / off state of the grounding circuit of the heater.

3. The temperature compensation circuit based on time and ambient temperature according to claim 1, characterized in that, Both transistor Q1 and transistor Q2 are BTS555I type transistors.

4. The temperature compensation circuit based on time and ambient temperature according to claim 1, characterized in that, The thermistor MF51-3000-1k has a corresponding resistance value at a specific temperature for temperature detection.

5. The temperature compensation circuit based on time and ambient temperature according to claim 1, characterized in that, The relay K1 is used to control the connection between the heating power supply and the heater.