CN110750116B - Temperature interval control circuit and electronic equipment - Google Patents

Abstract

The invention relates to a temperature interval control circuit and electronic equipment, wherein a first voltage is input into the reverse input end of a first operational amplifier u1, a temperature conversion circuit converts a collected temperature into a potential, the upper limit and the lower limit of a preset temperature interval are respectively simulated through a second voltage and a third voltage in a temperature comparison circuit, whether the collected temperature is in the preset temperature interval or not is determined by the temperature sensor after the potential is respectively compared with the second voltage and the third voltage, a comparison result is output to the temperature control circuit in a voltage signal form, the temperature control circuit logically judges the voltage signal of the comparison result and then outputs a potential signal to a driving unit of the electronic equipment, and the driving unit determines whether to drive a temperature raising and lowering device of the electronic equipment to raise or lower the temperature according to the potential signal output by the temperature control circuit, so that the temperature interval control circuit which does not need a singlechip and has stable performance is realized.

Description

Temperature range control circuit and electronic equipment

Technical Field

The present invention relates to the field of temperature control, and in particular to a temperature range control circuit and electronic equipment.

Background technique

At present, when the temperature of the object under test is controlled, the method adopted is: the single-chip microcomputer controls the temperature sensor to collect the temperature of the object under test and analyze it, and then controls the drive unit to drive the heating and cooling device to cool down or heat up the object under test, thereby realizing temperature control. However, if there is a problem with the software embedded in the single-chip microcomputer, the temperature control is likely to fail, and the operating temperature of the single-chip microcomputer is limited. Exceeding the operating temperature will cause abnormal operation.

Therefore, how to realize a temperature range control circuit that does not require a single-chip microcomputer and has stable performance is a technical problem that needs to be solved urgently in the industry.

Summary of the invention

The technical problem to be solved by the present invention is to provide a temperature range control circuit and an electronic device in view of the deficiencies in the prior art.

A technical solution of a temperature range control circuit of the present invention is as follows:

It includes a temperature conversion circuit, a temperature comparison circuit and a temperature control circuit, wherein the temperature conversion circuit includes a temperature sensor C and a first operational amplifier u1, the temperature comparison circuit includes a third operational amplifier u3 and a fourth operational amplifier u4, and the temperature control circuit includes a first XOR gate y1, a second XOR gate y2, a third XOR gate y3 and a D-type flip-flop u5;

The output end of the temperature sensor C is connected to the first resistor R1 and then grounded, a fourth voltage is input to the temperature sensor C, when the temperature is 0°C, the voltage value of the output end of the temperature sensor C is marked as the first voltage value, a first voltage of the first voltage value is connected to the reverse input end of the first operational amplifier u1, the non-inverting input end of the first operational amplifier u1 is connected to the output end of the temperature sensor C, and the output end of the first operational amplifier u1 is respectively connected to the positive input end of the third operational amplifier u3 and the reverse input end of the fourth operational amplifier u4;

The inverting input terminal of the third operational amplifier u3 is connected to the second voltage, and the output terminal of the third operational amplifier u3 is connected to the first input terminal A1 of the first XOR gate y1;

The positive input terminal of the fourth operational amplifier u4 is connected to the third voltage, and the output terminal of the fourth operational amplifier u4 is respectively connected to the second input terminal B1 of the first XOR gate y1, the second input terminal B2 of the second XOR gate y2 and the second input terminal B3 of the third XOR gate y3;

The first input terminal A3 of the third XOR gate y3 is connected to the output terminal of the first XOR gate y1, and the output terminal of the third XOR gate y3 is respectively connected to the D terminal of the D-type flip-flop and the first input terminal A2 of the second XOR gate y2;

The voltage control end of the switch K1 is connected to the output end of the second XOR gate y2, the input end of the switch K1 inputs a square wave signal, and the output end of the switch K1 is connected to the CP end of the D-type flip-flop;

The Q terminal of the D-type flip-flop is grounded. The terminal is used to connect the drive unit of the electronic device.

The beneficial effects of a temperature range control circuit of the present invention are:

Since the first voltage is input into the reverse input terminal of the first operational amplifier u1, the temperature conversion circuit can convert the temperature collected by the temperature sensor into a potential. The temperature comparison circuit simulates the upper limit and lower limit of the preset temperature range respectively through the second voltage and the third voltage. After comparing the potential with the second voltage and the third voltage respectively, it is determined whether the temperature collected by the temperature sensor is within the preset temperature range, and the comparison result is output to the temperature control circuit in the form of a voltage signal. The temperature control circuit performs logical judgment on the voltage signal of the comparison result and outputs a potential signal to the driving unit of the electronic device. The driving unit determines whether to drive the heating and cooling device of the electronic device to heat or cool according to the potential signal output by the temperature control circuit, thereby realizing a temperature range control circuit that does not require a single-chip microcomputer and has stable performance.

Based on the above solution, a temperature range control circuit of the present invention can also be improved as follows.

Furthermore, the temperature conversion circuit also includes a basic operational amplifier circuit, and the output end of the first operational amplifier u1 is connected to the basic operational amplifier circuit and then respectively connected to the positive input end of the third operational amplifier u3 and the reverse input end of the fourth operational amplifier u4.

The beneficial effect of adopting the above further scheme is: a basic operational amplifier circuit is set in the temperature conversion circuit, and the potential converted by the temperature sensor from the collected temperature is amplified and then used as the comparison potential of the current temperature. Accordingly, it is only necessary to adjust the voltage value of the second voltage and the voltage value of the third voltage to correspond to the upper and lower limits of the temperature range before comparing them with the comparison potential, so that the comparison result is more accurate.

Furthermore, the basic operational amplifier circuit includes a second operational amplifier u2, a fifth resistor R5 and a sixth resistor R6, the output end of the first operational amplifier u1 is connected to the positive input end of the second operational amplifier u2, the output end of the second operational amplifier u2 is respectively connected to the positive input end of the third operational amplifier u3 and the reverse input end of the fourth operational amplifier u4; the sixth resistor R6 is connected in series between the output end of the second operational amplifier u2 and its reverse input end, and is grounded through the fifth resistor R5.

The beneficial effect of adopting the above further solution is that the basic operational amplifier circuit is an inverting operational amplifier circuit, so that the temperature sensor amplifies the potential converted by the collected temperature and then uses it as the potential of the current temperature, which is more stable.

Furthermore, the temperature conversion circuit also includes a second resistor R2, a third resistor R3 and a fourth resistor R4. The reverse input terminal of the first operational amplifier u1 is connected to the ground through the second resistor R2, the third resistor R3 and then the ground. One end of the fourth resistor R4 is connected between the second resistor and the third resistor. The other end of the fourth resistor R4 is connected to a first power supply. The first power supply inputs the first voltage to the reverse input terminal of the first operational amplifier u1 through the fourth resistor R4 and the second resistor R2.

The beneficial effect of adopting the above further scheme is that the first voltage can be accurately input to the reverse input terminal of the first operational amplifier u1 by setting the resistance values of the second resistor R2, the third resistor R3 and the fourth resistor R4 and the voltage value of the first power supply, and the circuit is simple.

Furthermore, the temperature comparison circuit also includes a first wire H1, a second wire H2 and a series circuit connected to a second power supply, the series circuit is composed of a plurality of resistors connected in series and then grounded, one end of the first wire H1 and one end of the second wire H2 are respectively connected between two different adjacent resistors, the other end of the first wire H1 and the other end of the second wire H2 are respectively connected to the reverse input terminal of the third operational amplifier u3 and the forward input terminal of the fourth operational amplifier u4, and the second voltage and the third voltage are respectively input into them.

The beneficial effect of adopting the above further scheme is: by connecting the first wire H1 and the second wire H2 between two different resistors in the series circuit, the second voltage and the third voltage are output to the reverse input terminal of the third operational amplifier u3 and the positive input terminal of the fourth operational amplifier u4 respectively, and the circuit is simple.

Furthermore, the temperature control circuit also includes a fourth XOR gate y4, a first input terminal A4 and a second input terminal B4 of the fourth XOR gate y4 are respectively connected to the output terminal of the third operational amplifier u3 and the output terminal of the fourth operational amplifier u4, and the output terminal of the fourth XOR gate y4 is connected to the lamp L1 and then grounded.

The beneficial effect of adopting the above further solution is that when the driving unit is working, the lamp L1 is lit, that is, whether the driving unit is working is indicated by whether the lamp is lit.

Furthermore, the temperature comparison circuit also includes a first rectifier diode N1 and a second rectifier diode N2; the output end of the third operational amplifier u3 is first connected to the first rectifier diode N1 and then respectively connected to the first input end A1 of the first XOR gate y1 and the first input end A4 of the fourth XOR gate y4; the output end of the fourth operational amplifier u4 is first connected to the second rectifier diode N2 and then respectively connected to the second input end B1 of the first XOR gate y1, the second input end B2 of the second XOR gate y2 and the second input end B3 of the third XOR gate y3.

The beneficial effect of adopting the above further solution is: by setting the first rectifier diode N1 and the second rectifier diode N2, it is ensured that the voltage signal of the comparison result output by the output end of the third operational amplifier u3 and the output end of the fourth operational amplifier u4 is more stable.

Furthermore, it also includes a signal conditioning unit, the D-type trigger The end is connected to a driving unit of the electronic device after passing through the signal conditioning unit.

The beneficial effect of adopting the above further solution is: by providing a temperature conditioning unit, the voltage signal output by the temperature control circuit can be conditioned into a voltage signal that is more suitable for processing by the driving unit.

An electronic device adopts any one of the temperature range control circuits described above.

The beneficial effect of an electronic device of the present invention is that an electronic device capable of controlling temperature is realized.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a temperature range control circuit according to an embodiment of the present invention;

FIG2 is a circuit diagram of a temperature range control circuit according to an embodiment of the present invention;

Detailed ways

A current control circuit according to an embodiment of the present invention includes a temperature conversion circuit 101, a temperature comparison circuit 102 and a temperature control circuit 103, wherein the temperature conversion circuit 101 includes a temperature sensor C and a first operational amplifier u1, the temperature comparison circuit 102 includes a third operational amplifier u3 and a fourth operational amplifier u4, and the temperature control circuit 103 includes a first XOR gate y1, a second XOR gate y2, a third XOR gate y3 and a D-type flip-flop u5;

The output end of the temperature sensor C is connected to the first resistor R1 and then grounded, a fourth voltage is input to the temperature sensor C, when the temperature is 0°C, the voltage value of the output end of the temperature sensor C is marked as the first voltage value, a first voltage of the first voltage value is connected to the reverse input end of the first operational amplifier u1, the non-inverting input end of the first operational amplifier u1 is connected to the output end of the temperature sensor C, and the output end of the first operational amplifier u1 is respectively connected to the positive input end of the third operational amplifier u3 and the reverse input end of the fourth operational amplifier u4;

The inverting input terminal of the third operational amplifier u3 is connected to the second voltage, and the output terminal of the third operational amplifier u3 is connected to the first input terminal A1 of the first XOR gate y1;

The positive input terminal of the fourth operational amplifier u4 is connected to the third voltage, and the output terminal of the fourth operational amplifier u4 is respectively connected to the second input terminal B1 of the first XOR gate y1, the second input terminal B2 of the second XOR gate y2 and the second input terminal B3 of the third XOR gate y3;

The first input terminal A3 of the third XOR gate y3 is connected to the output terminal of the first XOR gate y1, and the output terminal of the third XOR gate y3 is respectively connected to the D terminal of the D-type flip-flop and the first input terminal A2 of the second XOR gate y2;

The voltage control end of the switch K1, i.e., the end a, is connected to the output end of the second XOR gate y2, the input end of the switch K1, i.e., the end b, is input with a square wave signal, and the output end of the switch K1, i.e., the end c, is connected to the CP end of the D-type flip-flop;

The Q terminal of the D-type flip-flop is grounded. The end is used to connect to the driving unit 105 of the electronic device.

Since the first voltage is input into the reverse input terminal of the first operational amplifier u1, the temperature conversion circuit 101 can convert the temperature collected by the temperature sensor into a potential. The temperature comparison circuit 102 simulates the upper limit and the lower limit of the preset temperature range respectively through the second voltage and the third voltage. After comparing the potential with the second voltage and the third voltage respectively, it is determined whether the temperature collected by the temperature sensor is within the preset temperature range, and the comparison result is output to the temperature control circuit 103 in the form of a voltage signal. The temperature control circuit 103 performs logical judgment on the voltage signal of the comparison result and outputs a potential signal to the drive unit 105 of the electronic device. The drive unit 105 determines whether to drive the temperature increase and decrease device of the electronic device to increase or decrease the temperature according to the potential signal output by the temperature control circuit 103, thereby realizing a temperature range control circuit that does not require a single-chip microcomputer and has stable performance and is low in cost.

Among them, the first voltage, the second voltage, the third voltage and the fourth voltage can be output directly through the power supply, or the first voltage, the second voltage and the third voltage can be output in the manner described below, and the square wave signal can be output by a signal generator, a square wave signal generator, or a square wave signal generating circuit.

Preferably, in the above technical solution, the temperature conversion circuit 101 also includes a basic operational amplifier circuit, and the output end of the first operational amplifier u1 is connected to the basic operational amplifier circuit and then respectively connected to the positive input end of the third operational amplifier u3 and the reverse input end of the fourth operational amplifier u4.

A basic operational amplifier circuit is set in the temperature conversion circuit 101, and the potential converted by the temperature sensor from the collected temperature is amplified and then used as the comparison potential of the current temperature. Accordingly, it is only necessary to adjust the voltage value of the second voltage and the voltage value of the third voltage to correspond to the upper and lower limits of the temperature range to compare with the comparison potential, so that the comparison result is more accurate. Among them, the basic operational amplifier circuit can select a positive phase operational amplifier circuit and an inverting operational amplifier circuit.

When the basic operational amplifier circuit selects an inverting operational amplifier circuit, specifically: the basic operational amplifier circuit includes a second operational amplifier u2, a fifth resistor R5 and a sixth resistor R6, the output end of the first operational amplifier u1 is connected to the positive input end of the second operational amplifier u2, and the output end of the second operational amplifier u2 is respectively connected to the positive input end of the third operational amplifier u3 and the reverse input end of the fourth operational amplifier u4; the sixth resistor R6 is connected in series between the output end of the second operational amplifier u2 and its reverse input end, and is grounded through the fifth resistor R5, so that the temperature sensor amplifies the potential converted by the collected temperature and then uses it as the potential of the current temperature more stably.

Preferably, in the above technical solution, the temperature conversion circuit 101 also includes a second resistor R2, a third resistor R3 and a fourth resistor R4, the reverse input terminal of the first operational amplifier u1 is connected to ground via the second resistor R2, the third resistor R3 and then the ground, one end of the fourth resistor R4 is connected between the second resistor and the third resistor, the other end of the fourth resistor R4 is connected to a first power supply, and the first power supply inputs the first voltage to the reverse input terminal of the first operational amplifier u1 via the fourth resistor R4 and the second resistor R2.

By setting the resistance values of the second resistor R2, the third resistor R3 and the fourth resistor R4 and the voltage value of the first power supply, the first voltage can be accurately input to the inverting input terminal of the first operational amplifier u1, and the circuit is simple.

Preferably, in the above technical solution, the temperature comparison circuit 102 also includes a first wire H1, a second wire H2 and a series circuit connected to a second power supply, the series circuit is composed of a plurality of resistors connected in series and then grounded, one end of the first wire H1 and one end of the second wire H2 are respectively connected between two different adjacent resistors, the other end of the first wire H1 and the other end of the second wire H2 are respectively connected to the reverse input terminal of the third operational amplifier u3 and the positive input terminal of the fourth operational amplifier u4, and the second voltage and the third voltage are respectively input into them.

The first wire H1 and the second wire H2 are connected between two different resistors in the series circuit to output the second voltage and the third voltage to the reverse input terminal of the third operational amplifier u3 and the positive input terminal of the fourth operational amplifier u4 respectively. The circuit is simple.

Preferably, in the above technical solution, the temperature control circuit 103 further includes a fourth XOR gate y4, a first input terminal A4 and a second input terminal B4 of the fourth XOR gate y4 are respectively connected to the output terminal of the third operational amplifier u3 and the output terminal of the fourth operational amplifier u4, and the output terminal of the fourth XOR gate y4 is connected to the lamp L1 and then grounded. When the driving unit 105 is working, the lamp L1 lights up, that is, whether the driving unit 105 is working is indicated by whether the lamp is lit.

Preferably, in the above technical solution, the temperature comparison circuit 102 also includes a first rectifier diode N1 and a second rectifier diode N2, the output end of the third operational amplifier u3 is first connected to the first rectifier diode N1 and then respectively connected to the first input end A1 of the first XOR gate y1 and the first input end A4 of the fourth XOR gate y4; the output end of the fourth operational amplifier u4 is first connected to the second rectifier diode N2 and then respectively connected to the second input end B1 of the first XOR gate y1, the second input end B2 of the second XOR gate y2 and the second input end B3 of the third XOR gate y3.

By providing the first rectifying diode N1 and the second rectifying diode N2, it is ensured that the voltage signal of the comparison result outputted by the output end of the third operational amplifier u3 and the output end of the fourth operational amplifier u4 is more stable.

Preferably, in the above technical solution, a signal conditioning unit 104 is further included, and the D-type trigger The end is connected to the driving unit 105 of the electronic device after passing through the signal conditioning unit 104.

The temperature conditioning unit is provided to condition the voltage signal output by the temperature control circuit 103 into a voltage signal more suitable for processing by the driving unit 105 .

The following is further explained in conjunction with Figures 1 and 2:

In this embodiment, a temperature range control circuit includes a temperature conversion circuit 101, a temperature comparison circuit 102, a temperature control circuit 103, a signal conditioning unit 104 and a driving unit 105, wherein the temperature conversion circuit 101 includes a temperature sensor C, a first operational amplifier u1, a basic operational amplifier circuit, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4, wherein the basic operational amplifier circuit includes a second operational amplifier u2, a fifth resistor R5 and a sixth resistor R6, wherein the temperature sensor C uses a negative temperature coefficient thermistor NTC, and the measured The higher the temperature of the object, the smaller its resistance. The fourth voltage is input to the temperature sensor C, and the voltage output by the temperature sensor when it is connected in series with the first resistor R1 at 0°C is measured. According to the voltage value output by the first power supply, the appropriate second resistor R2, third resistor R3, and fourth resistor R4 are selected to make the first voltage input to the reverse input terminal of the first operational amplifier u1 equal to the voltage output by the temperature sensor at 0°C, thereby converting the temperature of the object collected by the temperature sensor C into a potential, which is then amplified by the first operational amplifier u1 and the basic operational amplifier circuit to form a comparison potential.

The temperature comparison circuit 102 includes a third operational amplifier u3, a fourth operational amplifier u4, a first rectifier diode N1, a second rectifier diode N2, and a series circuit formed by seven resistors connected in series, and the seven resistors are marked as a first series resistor Rt1, a second series circuit Rt2, a third series resistor Rt3, a fourth series resistor Rt4, a fifth series resistor Rt5, a sixth series resistor Rt6, and a seventh series resistor Rt7, wherein one end of the first wire H1 is connected to the first series resistor Rt1 and the second series circuit Rt 2, the other end of H1 is connected to the inverting input end of the third operational amplifier u3, one end of the second wire H2 is connected between the fourth series resistor Rt4 and the fifth series resistor Rt5, and the other end of the second wire H2 is connected to the positive input end of the fourth operational amplifier u4. For example, the preset temperature range is 30°C to 70°C, that is, the upper limit of the preset temperature range is 70°C, and the lower limit of the preset temperature range is 30°C. The fourth voltage is input to the temperature sensor C, and the voltage output by the temperature sensor at 70°C and the voltage at 30°C with the first resistor R1 are measured. The voltages output after the series connection are expressed as an upper limit voltage and a lower limit voltage for convenience. At this time, the upper limit voltage and the lower limit voltage are multiplied by the same multiples according to the multiples of the comparison circuit amplified by the first operational amplifier u1 and the basic operational amplifier circuit to obtain the multiple upper limit voltage and the multiple lower limit voltage respectively. At this time, the first series resistor Rt1, the second series circuit Rt2, the third series resistor Rt3, the fourth series resistor Rt4, the fifth series resistor Rt5, the sixth series resistor Rt6, and the seventh series resistor Rt7 with appropriate resistance values can be selected according to the output voltage of the second voltage, so that the potential between the first series resistor Rt1 and the second series circuit Rt2 is equal to the multiple upper limit voltage, and the potential between the fourth series resistor Rt4 and the fifth series resistor Rt5 is equal to the multiple lower limit voltage, that is, the second voltage is equal to the multiple upper limit voltage, and the third voltage is equal to the multiple lower limit voltage, thereby converting the upper limit and the lower limit of the preset temperature range into the second voltage and the third voltage, which is convenient for comparison with the comparison potential. Moreover, since the comparison potential, the second voltage and the third voltage are also based on the zero potential, their respective values can be directly compared.

The temperature control circuit 103 includes a first XOR gate y1, a second XOR gate y2, a third XOR gate y3, a fourth XOR gate y4, a switch K1, a D-type trigger u5 and a lamp L1; the above components are connected according to the connection method described above, and the temperature control circuit 103 also includes: a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a tenth resistor R10, wherein the fourth XOR gate y4 is connected to the seventh resistor R7 and then to the lamp L1, the Q end of the D-type trigger u5 is grounded after passing through the eighth resistor R8, and the D-type trigger The terminals are connected to the signal conditioning unit 104 and the tenth resistor R10 respectively through the ninth resistor R9, and the tenth resistor R10 is grounded. The working process is as follows:

The temperature conversion circuit 101 converts the temperature of the controlled object collected by the temperature sensor C into the potential of the current temperature and inputs it into the temperature comparison circuit 102. Then:

1) If the temperature of the current controlled object is higher than the upper limit of the preset temperature range, the second voltage and the third voltage are both greater than the comparison potential, then the output end of the third operational amplifier u3 outputs a high potential to the first output end A1 of the first XOR gate y1 and the first input end A4 of the fourth XOR gate y4 through the first rectifier diode N1, and the output end of the fourth operational amplifier u4 outputs a low potential to the second input end B1 of the first XOR gate y1, the second input end B2 of the second XOR gate y2 and the second input end B3 of the third XOR gate y3 through the second rectifier diode N2, the output end of the first XOR gate y1 will output a high potential to the first input end A3 of the third XOR gate y3, and then the output end of the third XOR gate y3 will output a high potential to the first input end A2 of the second XOR gate y2 and the D end of the D-type flip-flop u5, the output end of the second XOR gate y2 will output a high potential to the voltage control end of the switch K1, i.e., the a end, to close it, at this time the square wave signal will be input to the CP end of the D-type flip-flop u5 to trigger its operation, and the D-type flip-flop u5 The output end of the fourth XOR gate y4 will output a high potential to the lamp L1 to light it up, to indicate that the driving unit 105 is working.

2) If the temperature of the current controlled object is lower than the lower limit of the preset temperature range, the second voltage and the third voltage are both lower than the comparison potential, then the output end of the third operational amplifier u3 outputs a low potential to the first input end A1 of the first XOR gate y1 and the first input end A4 of the fourth XOR gate y4 through the first rectifier diode N1, and the output end of the fourth operational amplifier u4 outputs a high potential to the second input end B1 of the first XOR gate y1, the second input end B2 of the second XOR gate y2, and the second input end B3 of the third XOR gate y3 through the second rectifier diode N2. The output end of the first XOR gate y1 will output a high potential to the first input end A3 of the third XOR gate y3, the output end of the third XOR gate y3 will output a low potential to the first input end A2 of the second XOR gate y2 and the D end of the D-type flip-flop u5, the output end of the second XOR gate y2 will output a high potential to the voltage control end of the switch K1, i.e., the a end, to close it, and the square wave signal will be input to the CP end of the D-type flip-flop u5 to trigger its operation, and the D-type flip-flop u5 will be turned on. The output terminal of the fourth XOR gate y4 will output a high potential signal to the lamp L1, which will light up and indicate that the driving unit 105 is working.

3) If the temperature of the controlled object is within the preset temperature range, the second voltage is less than the comparison potential, and the third voltage is greater than the comparison potential. At this time, the output end of the third operational amplifier u3 outputs a low potential to the first input end A1 of the first XOR gate y1 and the first input end A4 of the fourth XOR gate y4 through the first rectifier diode N1, and the fourth operational amplifier u4 outputs a low potential to the second input end B1 of the first XOR gate y1, the second input end B2 of the second XOR gate y2, and the second input end B3 of the third XOR gate y3 through the second rectifier diode N2. The output end of the first XOR gate y1 will output a low potential to the first input end A3 of the third XOR gate y3, the output end of the third XOR gate y3 will output a low potential to the first input end A2 of the second XOR gate y2 and the D end of the D-type flip-flop u5, and the output end of the second XOR gate y2 will output a low potential to the voltage control end of the switch K1, i.e., the a end, to disconnect it. The square wave signal will not be able to be input to the CP end of the D-type flip-flop u5 to make it work. At this time, the D-type flip-flop u5 The end will output a no-potential signal, the driving unit 105 will stop working, and the heating and cooling device will not work. Since the output end of the fourth XOR gate y4 will output a low potential to the lamp L1, it will not light up, to indicate that the driving unit 105 is not working.

An electronic device, using the current control circuit in any of the above embodiments, realizes an electronic device capable of controlling temperature, wherein the electronic device can be a thermostat, the temperature rise and fall device of the thermostat cavity is a heater and a cooling device composed of a compressor, a condenser, a throttling device, and an evaporator, the temperature sensor C detects the temperature in the thermostat cavity, the preset temperature range is 4°C to 5°C, if the temperature in the thermostat cavity is 6°C, the cooling device of the thermostat cavity starts to cool down, if the temperature in the thermostat cavity is 3°C, the heater of the thermostat cavity starts to cool down Heating, if the temperature in the thermostat chamber is 4.5°C, the cooling device and the heater of the thermostat are not started. Here, the driving unit 105 is explained. The driving unit 105 can be understood as a circuit board. In traditional temperature control, the single-chip microcomputer inputs a signal to the circuit board of the thermostat, and then drives the heater or the cooling device to start through the circuit board. In this application, the temperature range control circuit in the above embodiment is connected to the circuit board, and then the circuit board drives the heater or the cooling device to start. Please refer to the above content for the specific process, which will not be repeated here.

In another embodiment, the electronic device may also be a computer. Since the CPU of a computer generally overheats, the preset temperature range is 10°C to 50°C. If the temperature sensor C detects that the temperature of the computer's CPU exceeds 50°C, the fan can be turned on for cooling. The electronic device may also be a mobile phone, etc.

In the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims (5)

1. A temperature range control circuit, characterized in that it comprises a temperature conversion circuit, a temperature comparison circuit and a temperature control circuit, wherein the temperature conversion circuit comprises a temperature sensor C and a first operational amplifier (u1), the temperature comparison circuit comprises a third operational amplifier (u3) and a fourth operational amplifier (u4), and the temperature control circuit comprises a first XOR gate (y1), a second XOR gate (y2), a third XOR gate (y3) and a D-type flip-flop (u5); The output end of the temperature sensor C is connected to the first resistor R1 and then grounded, a fourth voltage is input to the temperature sensor C, when the temperature is 0°C, the voltage value of the output end of the temperature sensor C is marked as the first voltage value, a first voltage having the same value as the first voltage is connected to the reverse input end of the first operational amplifier (u1), the non-inverting input end of the first operational amplifier (u1) is connected to the output end of the temperature sensor C, and the output end of the first operational amplifier (u1) is respectively connected to the positive input end of the third operational amplifier (u3) and the reverse input end of the fourth operational amplifier (u4); The inverting input terminal of the third operational amplifier (u3) is connected to the second voltage, and the output terminal of the third operational amplifier (u3) is connected to the first input terminal A1 of the first XOR gate (y1); The positive input terminal of the fourth operational amplifier (u4) is connected to a third voltage, and the output terminal of the fourth operational amplifier (u4) is respectively connected to the second input terminal B1 of the first XOR gate (y1), the second input terminal B2 of the second XOR gate (y2), and the second input terminal B3 of the third XOR gate (y3); The first input terminal A3 of the third XOR gate (y3) is connected to the output terminal of the first XOR gate (y1), and the output terminal of the third XOR gate (y3) is respectively connected to the D terminal of the D-type flip-flop and the first input terminal A2 of the second XOR gate (y2); The voltage control end of the switch K1 is connected to the output end of the second XOR gate (y2), the input end of the switch K1 inputs a square wave signal, and the output end of the switch K1 is connected to the CP end of the D-type flip-flop; The Q terminal of the D-type flip-flop is grounded. The end is used to connect the drive unit of the electronic device; The temperature conversion circuit also includes a basic operational amplifier circuit, wherein the output end of the first operational amplifier (u1) is connected to the basic operational amplifier circuit and then respectively connected to the positive input end of the third operational amplifier (u3) and the negative input end of the fourth operational amplifier (u4); The basic operational amplifier circuit includes a second operational amplifier (u2), a fifth resistor R5 and a sixth resistor R6. The output end of the first operational amplifier (u1) is connected to the positive input end of the second operational amplifier (u2), and the output end of the second operational amplifier (u2) is respectively connected to the positive input end of the third operational amplifier (u3) and the negative input end of the fourth operational amplifier (u4); The sixth resistor R6 is connected in series between the output terminal of the second operational amplifier (u2) and its inverting input terminal, and is grounded through the fifth resistor R5; The temperature comparison circuit also includes a first wire H1, a second wire H2 and a series circuit connected to a second power supply, wherein the series circuit is composed of a plurality of resistors connected in series and then grounded, wherein one end of the first wire H1 and one end of the second wire H2 are respectively connected between two different adjacent resistors, and the other end of the first wire H1 and the other end of the second wire H2 are respectively connected to the inverting input end of a third operational amplifier (u3) and the positive input end of a fourth operational amplifier (u4), and are input with the second voltage and the third voltage respectively. 2. A temperature range control circuit according to claim 1, characterized in that the temperature control circuit also includes a fourth XOR gate (y4), a first input terminal A4 and a second input terminal B4 of the fourth XOR gate (y4) are respectively connected to the output terminal of the third operational amplifier (u3) and the output terminal of the fourth operational amplifier (u4), and the output terminal of the fourth XOR gate (y4) is connected to the lamp L1 and then grounded. 3. The temperature range control circuit according to claim 2, characterized in that the temperature comparison circuit further comprises a first rectifier diode N1 and a second rectifier diode N2, The output end of the third operational amplifier (u3) is first connected to the first rectifier diode N1 and then respectively connected to the first input end A1 of the first XOR gate (y1) and the first input end A4 of the fourth XOR gate (y4); The output end of the fourth operational amplifier (u4) is first connected to the second rectifier diode N2 and then respectively connected to the second input end B1 of the first XOR gate (y1), the second input end B2 of the second XOR gate (y2) and the second input end B3 of the third XOR gate (y3). 4. The temperature range control circuit according to claim 3, characterized in that it also includes a signal conditioning unit, wherein the D-type trigger The end is connected to a driving unit of the electronic device after passing through the signal conditioning unit. 5. An electronic device, characterized by adopting a temperature range control circuit according to any one of claims 1 to 4.