Circuit for realizing self-adaptive heating by detecting weak change rate of steam through NTC (Negative Temperature Coefficient)

Abstract

The utility model specifically relates to an NTC detection steam weak change rate self-adaptive heating circuit comprising a joint CN1 and an NTC detector, a first pin of the joint CN1 is connected with a first inductor L1, a second capacitor C2 is connected with a first-stage amplifier U2, the first-stage amplifier U2 is connected with a sixth capacitor C6, the sixth capacitor C6 is connected with a second-stage amplifier U3, and the second-stage amplifier U3 is connected with the NTC detector. The output end of the first-stage amplifier U3 is connected with a first inductor L1, the output end of the second-stage amplifier U3 is connected with a second inductor L2, the second inductor L2 is connected with a detection chip U1, a common end between the pin 1 of the connector CN1 and the first inductor L1 is connected with a first resistor R1, the first resistor R1 is further connected with a pin 26 of the detection chip U1, and the detection chip U1 is connected with an electric heating tube. The circuit outputs voltage through the NTC detector, the voltage is subjected to two-stage amplification through the first-stage amplifier U2 and the second-stage amplifier U3, the second capacitor C2 and the sixth capacitor C6 are charged and discharged due to voltage change, and the detection chip U1 accurately measures the weak change of 0.01 V output by the NTC detector.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of NTC detection steam weak change rate realizes self-adapting heating circuit. BACKGROUND

[0002] With the rapid development of kitchen intelligent appliances, microwave ovens have appeared in various places, such as office tea rooms, catering, ordinary families, etc., and become increasingly important. The function of ordinary microwave ovens is usually to select food. Then determine the approximate weight, and then select the time. The food cooked in this way is difficult to achieve the ideal state, and often has to be used as a second choice because of time saving.

[0003] Especially on special food, because of the common microwave function setting, the food is not cooked and time is wasted, deviating from the definition of microwave ovens for people's fast-paced life. Therefore, it is particularly urgent to develop a more accurate, stable and easy-to-maintain temperature detection technology. SUMMARY

[0004] The utility model aims at at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to propose a kind of NTC detection steam weak change rate realizes self-adapting heating circuit, can react quickly, precision is high, and the temperature detection of easy-to-maintain is met with the high standard demand of modern automatic management system to temperature monitoring.

[0005] According to the NTC detection steam weak change rate realizes self-adapting heating circuit of the utility model, including joint CN1 and NTC detector, joint CN1 and NTC detector are connected, the 1 foot of joint CN1 is connected with first inductance L1, first inductance L1 is connected with second capacitor C2, second capacitor C2 is connected with first stage amplifier U2, first stage amplifier U2 is connected with sixth capacitor C6, sixth capacitor C6 is connected with second stage amplifier U3, the output end of second stage amplifier U3 is connected with second inductance L2, second inductance L2 is connected with detection chip U1, the common end between the 1 foot of joint CN1 and first inductance L1 is connected with first resistance R1, first resistance R1 is also connected to the 26 foot of detection chip U1, and detection chip U1 is connected with electric heating tube.

[0006] Specific further, the 5 foot of the detection chip U1 is connected with ninth capacitor C9, and the ninth capacitor C9 is connected with electrolytic capacitor EC1 in parallel, and the common end of one end of the ninth capacitor C9 and electrolytic capacitor EC1 is connected with +5V power supply end, and the common end of the other end of the ninth capacitor C9 and electrolytic capacitor EC1 is connected with ground terminal GND.

[0007] Specific further, the second inductance L2 and detection chip U1 are connected through tenth resistance R10.

[0008] Specific further, the first resistance R1 is connected with the second resistance R2, the second resistance R2 is connected with the first capacitor C1, and the other end of the first capacitor C1 is connected to the 1 pin of the joint CN1.

[0009] Specific further, the second capacitor C2 is connected with the first stage amplifier U2 through the fourth resistance R4, the common end between the second capacitor C2 and the fourth resistance R4 is connected with the third resistance R3, the common end between the fourth resistance R4 and the 3 pin of the first stage amplifier U2 is connected with the third capacitor C3, the other end of the third resistance R3 and the third capacitor C3 is connected, the other end of the third resistance R3 and the third capacitor C3 is connected with the fourth capacitor C4, the other end of the fourth capacitor C4 is connected to the 2 pin of the first stage amplifier U2, the fifth resistance R5 is connected in parallel between the 1 pin and the 2 pin of the first stage amplifier U2, the fifth capacitor C5 is connected in parallel with the fifth resistance R5, the sixth resistance R6 is further connected with the fifth capacitor C5, and the sixth resistance R6 is further connected to the common end between the third capacitor C3 and the fourth capacitor C4.

[0010] Specific further, the 8 pin of the second stage amplifier U3 is connected with the +5V power supply end.

[0011] Specific further, the common end between the second stage amplifier U3 and the sixth capacitor C6 is connected with the seventh resistance R7, the other end of the seventh resistance R7 is connected to the ground end GND, the ninth resistance R9 is connected in parallel between the 6 pin and the 7 pin of the second stage amplifier U3, the eighth resistance R8 and the seventh capacitor C7 are connected to the both ends of the ninth resistance R9, and the other end of the eighth resistance R8 and the other end of the seventh capacitor C7 are connected.

[0012] The beneficial effects of the utility model are: the circuit detects voltage through the NTC detector, carries out two-stage amplification through the first stage amplifier U2 and the second stage amplifier U3, and the second capacitor C2 and the sixth capacitor C6 charge and discharge due to voltage change, the detection chip U1 starts the algorithm, and accurate measurement of the weak change of 0.01V output by the NTC detector is realized. BRIEF DESCRIPTION OF DRAWINGS

[0013] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings.

[0014] Figure 1 It is the circuit diagram of the utility model.

[0015] Figure 2 It is the detection chip U1 and electric heating tube connection schematic diagram of the utility model. DETAILED DESCRIPTION

[0016] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as limiting the present application.

[0017] Reference is made below Figure 1 And Figure 2 A NTC detection steam weak change rate adaptive heating circuit according to an embodiment of the present application is described below, which comprises a joint CN1 and an NTC detector, the joint CN1 and the NTC detector are connected, a first inductor L1 is connected to the 1 pin of the joint CN1, the first inductor L1 is connected with a second capacitor C2, the second capacitor C2 is connected with a first-stage amplifier U2, the first-stage amplifier U2 is connected with a sixth capacitor C6, the sixth capacitor C6 is connected with a second-stage amplifier U3, the output end of the second-stage amplifier U3 is connected with a second inductor L2, the second inductor L2 is connected with a detection chip U1, a first resistor R1 is connected to the common end between the 1 pin of the joint CN1 and the first inductor L1, the first resistor R1 is also connected to the 26 pin of the detection chip U1, and the detection chip U1 is connected with an electric heating tube 100.

[0018] The circuit detects the voltage through the NTC detector, implements two-stage amplification voltage through the first-stage amplifier U2 and the second-stage amplifier U3, and the second capacitor C2 and the sixth capacitor C6 charge and discharge due to voltage change, the detection chip U1 operates a preset algorithm, and accurate measurement of 0.01V weak change of the NTC detector output is realized; in addition, the detection chip U1 can control the electric heating tube 100, and accurate heating is implemented.

[0019] The circuit designs the first-stage amplifier U2 and the second-stage amplifier U3 to amplify; cooperates the second capacitor C2 and the sixth capacitor C6 to implement voltage stabilization. When weak voltage change occurs, the second capacitor C2 and the sixth capacitor C6 respectively discharge to the first-stage amplifier U2 and the second-stage amplifier U3, the first-stage amplifier U2 amplifies by 100 times, the voltage change here reaches 1V, the second-stage amplifier U3 amplifies by 10 times, and the input voltage here can be output as 5V, the detection chip U1 only needs to detect the 5V level output in a unit time, and the weak voltage change of the NTC detector output can be judged.

[0020] The detection chip U1 inputs the algorithm software developed specially, analyzes the collected capacitor change data in real time, filters noise interference, accurately calculates the weak voltage change of the NTC detector output through the correction model, and has self-learning and adaptive capabilities to cope with the influence of different container shapes and materials.

[0021] The 5th pin of the detection chip U1 is connected with the ninth capacitor C9, the ninth capacitor C9 is connected with the electrolytic capacitor EC1 in parallel, one end of the ninth capacitor C9 and the electrolytic capacitor EC1 is connected with the +5V power supply end, the other end of the ninth capacitor C9 and the electrolytic capacitor EC1 is connected with the ground end GND. The ninth capacitor C9 and the electrolytic capacitor EC1 play a role in stabilizing voltage.

[0022] The tenth resistor R10 is connected between the second inductor L2 and the detection chip U1. The tenth resistor R10 plays a role in limiting voltage and protecting the detection chip U1.

[0023] The first resistor R1 is also connected with the second resistor R2, the second resistor R2 is connected with the first capacitor C1, the other end of the first capacitor C1 is connected to the 1st pin of the joint CN1. The first resistor R1 and the second resistor R2 sample the output voltage of the NTC detector.

[0024] The second capacitor C2 is connected with the first stage amplifier U2 through the fourth resistor R4, the common end between the second capacitor C2 and the fourth resistor R4 is connected with the third resistor R3, the common end between the fourth resistor R4 and the 3rd pin of the first stage amplifier U2 is connected with the third capacitor C3, the other end of the third resistor R3 and the third capacitor C3 is connected, the other end of the third resistor R3 and the third capacitor C3 is connected with the fourth capacitor C4, the other end of the fourth capacitor C4 is connected to the 2nd pin of the first stage amplifier U2, the fifth resistor R5 is connected in parallel between the 1st pin and the 2nd pin of the first stage amplifier U2, the fifth capacitor C5 is connected in parallel with the fifth resistor R5, the sixth resistor R6 is also connected to the common end between the third capacitor C3 and the fourth capacitor C4. The 8th pin of the second stage amplifier U3 is connected with the +5V power supply end. The +5V power supply end supplies power to the second stage amplifier U3. The fifth resistor R5 and the sixth resistor R6 are used in combination, which helps to improve the stability of the circuit.

[0025] The common end between the second stage amplifier U3 and the sixth capacitor C6 is connected with the seventh resistor R7, the other end of the seventh resistor R7 is connected to the ground end GND, the ninth resistor R9 is connected in parallel between the 6th pin and the 7th pin of the second stage amplifier U3, the eighth resistor R8 and the seventh capacitor C7 are connected to the two ends of the ninth resistor R9, the other end of the eighth resistor R8 and the other end of the seventh capacitor C7 are connected. The ninth resistor R9 and the eighth resistor R8 are used in combination, which helps to improve the stability of the circuit.

[0026] Although the embodiments of the utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. An adaptive heating circuit for NTC detection of weak change rate of steam, comprising a joint CN1 and an NTC detector, the joint CN1 and the NTC detector being connected, characterized in that: The 1 foot of the joint CN1 is connected with the first inductance L1, the first inductance L1 is connected with the second capacitor C2, the second capacitor C2 is connected with the first stage amplifier U2, the first stage amplifier U2 is connected with the sixth capacitor C6, the sixth capacitor C6 is connected with the second stage amplifier U3, the output end of the second stage amplifier U3 is connected with the second inductance L2, the second inductance L2 is connected with the detection chip U1, the common end between the 1 foot of the joint CN1 and the first inductance L1 is connected with the first resistance R1, the first resistance R1 is also connected to the 26 foot of the detection chip U1, the detection chip U1 is connected with the electric heating tube (100).

2. The adaptive heating circuit for NTC detection of weak rate of change of vapor according to claim 1, wherein: The 5 foot of the detection chip U1 is connected with the ninth capacitor C9, the ninth capacitor C9 is connected with the electrolytic capacitor EC1 in parallel, the common end of one end of the ninth capacitor C9 and the electrolytic capacitor EC1 is connected with the +5V power end, the common end of the other end of the ninth capacitor C9 and the electrolytic capacitor EC1 is connected with the ground end GND.

3. The adaptive heating circuit for NTC detection of weak rate of change of vapor according to claim 1, wherein: The second inductance L2 and the detection chip U1 are connected through the tenth resistance R10.

4. The NTC detecting steam weak change rate adaptive heating circuit according to claim 1, characterized in that: The first resistance R1 is also connected with the second resistance R2, the second resistance R2 is connected with the first capacitor C1, the other end of the first capacitor C1 is connected to the 1 foot of the joint CN1.

5. The NTC detecting steam weak change rate adaptive heating circuit according to claim 1, characterized in that: The second capacitor C2 and the first stage amplifier U2 are connected through the fourth resistance R4, the common end between the second capacitor C2 and the fourth resistance R4 is connected with the third resistance R3, the common end between the fourth resistance R4 and the 3 foot of the first stage amplifier U2 is connected with the third capacitor C3, the other end of the third resistance R3 and the third capacitor C3 is connected, the common end of the other end of the third resistance R3 and the third capacitor C3 is connected with the fourth capacitor C4, the other end of the fourth capacitor C4 is connected to the 2 foot of the first stage amplifier U2, the fifth resistance R5 is connected in parallel between the 1 foot and the 2 foot of the first stage amplifier U2, the fifth capacitor C5 is connected in parallel with the fifth resistance R5, the sixth resistance R6 is also connected to the common end between the third capacitor C3 and the fourth capacitor C4.

6. The NTC detecting steam weak change rate adaptive heating circuit according to claim 1, characterized in that: The 8 foot of the second stage amplifier U3 is connected with the +5V power end.

7. The NTC detecting steam weak change rate adaptive heating circuit according to claim 1, characterized in that: The common end between the second stage amplifier U3 and the sixth capacitor C6 is connected with the seventh resistance R7, the other end of the seventh resistance R7 is connected to the ground end GND, the ninth resistance R9 is connected in parallel between the 6 foot and the 7 foot of the second stage amplifier U3, the eighth resistance R8 and the seventh capacitor C7 are respectively connected to the two ends of the ninth resistance R9, the other end of the eighth resistance R8 and the other end of the seventh capacitor C7 are connected.

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