Constant-temperature heating cushion control circuit

Abstract

The utility model discloses a constant-temperature heating cushion control circuit. The temperature control circuit comprises a main control chip, a heating circuit, an NTC temperature detection circuit, a touch circuit, a temperature display circuit and a power supply, the heating circuit, the NTC temperature detection circuit, the touch circuit and the temperature display circuit are all connected with the main control chip, and the main control chip, the heating circuit, the NTC temperature detection circuit and the touch circuit are all connected with the power supply. The seat cushion has the beneficial effects that the temperature of the seat cushion can be detected in real time; different temperature heating gears can be selected; the heating temperature value of the cushion and different temperature heating gears can be displayed; the purposes of selecting the temperature and displaying the temperature value are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the cushion control related technical field, especially point to a constant temperature heating cushion control circuit. BACKGROUND

[0002] Heating cushion is a device that provides extra warmth in cold seasons, especially suitable for use in winter, which can significantly improve the comfort of users. There are two heating methods for heating cushions: double-zone heating and integrated heating. Double-zone heating pad has two heating pieces inside, which can provide more uniform temperature distribution; while integrated heating pad has only one heating piece, and the heating effect is relatively concentrated. For the existing integrated heating cushion, the function is relatively single, which is usually set to a certain temperature for heating according to the internal preset temperature after power on, and cannot adjust the temperature, nor can it know the specific temperature value. SUMMARY

[0003] The utility model discloses in order to overcome the above -mentioned insufficient in the prior art, provide a constant temperature heating cushion control circuit that can select temperature and display temperature value.

[0004] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A constant temperature heating cushion control circuit, including main control chip, heating circuit, NTC temperature detection circuit, touch circuit, temperature display circuit and power supply, heating circuit, NTC temperature detection circuit, touch circuit and temperature display circuit all are connected with main control chip, main control chip, heating circuit, NTC temperature detection circuit and touch circuit all are connected with power supply.

[0006] Among them, heating circuit is used to heat the cushion operation;NTC temperature detection circuit is used to detect the cushion temperature in real time;Touch electric control is used to start the cushion heating function and select different temperature heating position;Temperature display circuit is used to display the temperature value of cushion heating and display different temperature heating position;Through NTC temperature detection circuit to detect the cushion temperature in real time, when the temperature meets the requirement, then control heating circuit stops heating, when the temperature does not meet the requirement, then control heating circuit heats, and through temperature display circuit to display the temperature value of cushion, reaches the purpose that can select temperature and display temperature value.

[0007] As preferred, the touch circuit comprises a touch switch, a touch resistance, a touch capacitor, a touch chip, a first current-limiting resistance and a second current-limiting resistance, the input ends of the touch switch, the touch resistance and the touch chip are sequentially connected, one end of the touch capacitor is connected between the touch resistance and the input end of the touch chip, the other end of the touch capacitor is grounded, the output end of the touch chip is connected to one end of the first current-limiting resistance, one end of the second current-limiting resistance is connected to a power supply, and the other end of the first current-limiting resistance and the other end of the second current-limiting resistance are connected and then connected to a master control chip.

[0008] As preferred, the heating circuit comprises a heating sheet, a third current-limiting resistance, a pull-down resistance and a MOS tube, the output end of the master control chip is connected to the gate of the MOS tube through the third current-limiting resistance, one end of the pull-down resistance is connected between the third current-limiting resistance and the gate of the MOS tube, the other end of the pull-down resistance and the drain of the MOS tube are grounded, the source of the MOS tube is connected to one end of the heating sheet, and the other end of the heating sheet is connected to a power supply.

[0009] As preferred, the NTC temperature detection circuit comprises an NTC thermistor, a first resistance, a second resistance, a first capacitor and a second capacitor, one end of the NTC thermistor is connected to the master control chip through the second resistance, one end of the first resistance is connected to a power supply, the other end of the NTC thermistor, one end of the first capacitor and one end of the second capacitor are grounded, the other end of the first resistance and the other end of the first capacitor are both connected between the NTC thermistor and the second resistance, and the other end of the second capacitor is connected between the NTC thermistor and the master control chip.

[0010] As preferred, the temperature display circuit comprises a low-temperature indicating lamp, a medium-temperature indicating lamp, a high-temperature indicating lamp and a temperature value display lamp, one end of the low-temperature indicating lamp, one end of the medium-temperature indicating lamp and one end of the high-temperature indicating lamp are all connected to the master control chip, and the other end of the low-temperature indicating lamp, the other end of the medium-temperature indicating lamp and the other end of the high-temperature indicating lamp are all connected to the temperature value display lamp.

[0011] As preferred, the power supply is a 5V direct-current power supply, and the master control chip is connected with a switch indicating lamp.

[0012] The utility model discloses a heating seat temperature display device, which can realize real-time detection of the temperature of a seat cushion, select different temperature heating gears, display the temperature value of the seat cushion heating and display different temperature heating gears, and has the advantages of temperature selection and temperature value display. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the circuit principle diagram of the utility model;

[0014] Figure 2 This is the circuit schematic diagram of this utility model.

[0015] In the diagram: 1. Main control chip, 2. Heating circuit, 3. NTC temperature detection circuit, 4. Touch circuit, 5. Temperature display circuit, 6. Power supply. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] like Figure 1 , Figure 2 In the described embodiment, a constant temperature heating seat cushion control circuit includes a main control chip 1, a heating circuit 2, an NTC temperature detection circuit 3, a touch circuit 4, a temperature display circuit 5, and a power supply 6. The heating circuit 2, the NTC temperature detection circuit 3, the touch circuit 4, and the temperature display circuit 5 are all connected to the main control chip 1, and the main control chip 1, the heating circuit 2, the NTC temperature detection circuit 3, and the touch circuit 4 are all connected to the power supply 6.

[0018] The touch circuit 4 includes a touch switch, a touch resistor, a touch capacitor, a touch chip, a first current-limiting resistor, and a second current-limiting resistor. The input terminals of the touch switch, touch resistor, and touch chip are connected in sequence. One end of the touch capacitor is connected between the input terminals of the touch resistor and the touch chip, and the other end of the touch capacitor is grounded. The output terminal of the touch chip is connected to one end of the first current-limiting resistor. One end of the second current-limiting resistor is connected to the power supply 6. The other ends of the first and second current-limiting resistors are connected to the main control chip 1.

[0019] The heating circuit 2 includes a heating element, a third current-limiting resistor, a pull-down resistor, and a MOSFET. The output terminal of the main control chip 1 is connected to the gate of the MOSFET through the third current-limiting resistor. One end of the pull-down resistor is connected between the third current-limiting resistor and the gate of the MOSFET. The other end of the pull-down resistor and the drain of the MOSFET are both grounded. The source of the MOSFET is connected to one end of the heating element, and the other end of the heating element is connected to the power supply 6.

[0020] The NTC temperature detection circuit 3 includes an NTC thermistor, a first resistor, a second resistor, a first capacitor, and a second capacitor. One end of the NTC thermistor is connected to the main control chip 1 through the second resistor. One end of the first resistor is connected to the power supply 6. The other end of the NTC thermistor, one end of the first capacitor, and one end of the second capacitor are all grounded. The other ends of the first resistor and the first capacitor are connected between the NTC thermistor and the second resistor. The other end of the second capacitor is connected between the NTC thermistor and the main control chip 1.

[0021] The temperature display circuit 5 comprises a low temperature indicating lamp, a medium temperature indicating lamp, a high temperature indicating lamp and a temperature value display lamp, one end of the low temperature indicating lamp, one end of the medium temperature indicating lamp and one end of the high temperature indicating lamp are connected with the main control chip 1, the other end of the low temperature indicating lamp, the other end of the medium temperature indicating lamp and the other end of the high temperature indicating lamp are connected with the temperature value display lamp.

[0022] The power supply 6 is a 5V direct current power supply, and the main control chip 1 is connected with a switch indicating lamp.

[0023] As shown in Figure 2 , the specific circuit principle is as follows:

[0024] The 5V direct current power supply directly supplies power (J1, J0, U1, U2). The start-up is a LED (LE4) lamp always on.

[0025] The 5V voltage supplies power to the touch chip (U2), and the touch switch gives a signal which is transmitted to the KEY end of the touch chip (U2) through the touch resistance and the touch capacitor (R11, C4), so that the touch chip (U2) detects and feeds back to the main control chip (U1 detection). The size of the touch resistance value and the size of the touch capacitor value are inversely proportional to the sensitivity, the smaller the touch capacitor (C4) value, the higher the sensitivity; the smaller the touch resistance (R1) value, the higher the sensitivity. The signal output by the touch switch is received by the touch chip (U2) and then output by the output pin of the touch chip (U2) through the first current limiting resistor (R10) and the parallel 5V input second current limiting resistor (R9) to feedback the signal to the main control chip (U1 detection).

[0026] The heating circuit is a 5V voltage input, and the negative electrode is controlled by the main control chip (U1). When the main control chip (U1) outputs a signal through the third current limiting resistor (R12) and the pull-down resistor (R13), the MOS tube (Q1) is turned on to start the heating function.

[0027] The NTC thermistor in the NTC temperature detection circuit detects the real-time temperature of the heating sheet through the first resistor, the second resistor, the first capacitor and the second capacitor (R15, R14, C5, C6) and feeds back the temperature to the main control chip (U1), so as to detect the temperature and adjust the temperature of the heating sheet.

[0028] Three gear modes (controlled by the main control chip U1) are provided in the temperature display circuit: high temperature is displayed by the LED lamp as 65 degrees, medium temperature is displayed by the LED lamp as 55 degrees, and low temperature is displayed by the LED lamp as 45 degrees (wherein LEDD, LEDE, LEDF and LEDG display numbers, and LED1, LED2 and LED3 display high temperature, medium temperature and low temperature).

[0029] The principle of the control circuit is: long press touch switch power on, start LED light; then the frequency of temperature, when the starting temperature is the lowest temperature is LED light display 45 degrees, heating sheet starts heating until the temperature reaches 45 degrees is detected by NTC feedback to the main control chip (U1), the main control chip (U1) gives the command to stop heating; in the process of use, the temperature drops are detected by NTC, the main control chip gives the command to continue heating; so as to realize the function control of constant temperature heating cushion.

Claims

1. A constant temperature heating cushion control circuit, characterized by, The application relates to a temperature display device, which comprises a main control chip (1), a heating circuit (2), an NTC temperature detection circuit (3), a touch circuit (4), a temperature display circuit (5) and a power supply (6), wherein the heating circuit (2), the NTC temperature detection circuit (3), the touch circuit (4) and the temperature display circuit (5) are connected with the main control chip (1), the main control chip (1), the heating circuit (2), the NTC temperature detection circuit (3) and the touch circuit (4) are connected with the power supply (6), the touch circuit (4) comprises a touch switch, a touch resistor, a touch capacitor, a touch chip, a first current-limiting resistor and a second current-limiting resistor, the input ends of the touch switch, the touch resistor and the touch chip are sequentially connected, one end of the touch capacitor is connected between the touch resistor and the input end of the touch chip, the other end of the touch capacitor is grounded, the output end of the touch chip is connected with one end of the first current-limiting resistor, one end of the second current-limiting resistor is connected with the power supply (6), the other end of the first current-limiting resistor and the other end of the second current-limiting resistor are connected and then connected with the main control chip (1), the NTC temperature detection circuit (3) comprises an NTC thermistor, a first resistor, a second resistor, a first capacitor and a second capacitor, one end of the NTC thermistor is connected with the main control chip (1) through the second resistor, one end of the first resistor is connected with the power supply (6), the other end of the NTC thermistor, one end of the first capacitor and one end of the second capacitor are grounded, the other end of the first resistor and the other end of the first capacitor are both connected between the NTC thermistor and the second resistor, and the other end of the second capacitor is connected between the NTC thermistor and the main control chip (1).

2. The control circuit for a constant temperature heating cushion according to claim 1, wherein The heating circuit (2) comprises a heating sheet, a third current-limiting resistor, a pull-down resistor and a MOS tube, the output end of the main control chip (1) is connected with the gate of the MOS tube through the third current-limiting resistor, one end of the pull-down resistor is connected between the third current-limiting resistor and the gate of the MOS tube, the other end of the pull-down resistor and the drain of the MOS tube are both grounded, the source of the MOS tube is connected with one end of the heating sheet, and the other end of the heating sheet is connected with the power supply (6).

3. The control circuit for a constant temperature heating cushion according to claim 1, wherein The temperature display circuit (5) comprises a low-temperature indicating lamp, a medium-temperature indicating lamp, a high-temperature indicating lamp and a temperature value display lamp, one end of the low-temperature indicating lamp, one end of the medium-temperature indicating lamp and one end of the high-temperature indicating lamp are connected with the main control chip (1), and the other end of the low-temperature indicating lamp, the other end of the medium-temperature indicating lamp and the other end of the high-temperature indicating lamp are connected with the temperature value display lamp.

4. The control circuit for a constant temperature heating cushion according to claim 1, wherein The power supply (6) is a 5V direct-current power supply, and the main control chip (1) is connected with a switch indicating lamp.

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