CN209820642U - Temperature measuring circuit of temperature controller - Google Patents
Temperature measuring circuit of temperature controller Download PDFInfo
- Publication number
- CN209820642U CN209820642U CN201920269237.8U CN201920269237U CN209820642U CN 209820642 U CN209820642 U CN 209820642U CN 201920269237 U CN201920269237 U CN 201920269237U CN 209820642 U CN209820642 U CN 209820642U
- Authority
- CN
- China
- Prior art keywords
- resistor
- circuit
- capacitor
- trigger
- grounded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The utility model discloses a temperature measuring circuit of a temperature controller, which comprises an input detection circuit and a signal analysis circuit; the input detection circuit comprises an analog switch controller, a cold end compensation circuit, a thermocouple temperature measurement circuit, a thermal resistance temperature measurement circuit and a circuit error compensation circuit; the signal analysis circuit comprises an integrator, a triode, a first D trigger and a second D trigger. Adopt the utility model discloses, can increase the temperature measurement width of temperature controller, improve the temperature measurement precision of temperature controller.
Description
Technical Field
The utility model relates to a temperature measurement field especially relates to a temperature controller temperature measurement circuit.
Background
The basic principle of thermocouple temperature measurement is that two material conductors with different components form a closed loop, when temperature gradients exist at two ends, current flows through the loop, and electromotive force (thermoelectromotive force) exists between the two ends, so that the so-called Seebeck effect (Seebeck effect) is obtained. The homogeneous conductors of the two different compositions are hot electrodes, the end with the higher temperature being the working end and the end with the lower temperature being the free end, which is usually at some constant temperature. According to the functional relation between the thermoelectromotive force and the temperature, a thermocouple graduation table is manufactured; the scores were obtained at a free end temperature of 0 ℃ with different thermocouples having different scores. When the thermocouple is used for measuring temperature, the temperature of a cold end (the measuring end is a hot end, and the end connected with the measuring circuit through a lead is called the cold end) of the thermocouple is required to be kept unchanged, and the magnitude of the thermoelectric force of the thermocouple is in a certain proportional relation with the measured temperature. If the temperature of the cold end (environment) changes during measurement, the accuracy of measurement is seriously influenced. The cold end compensation of the thermocouple is normal by taking certain measures to compensate the influence caused by the cold end temperature change.
Thermal resistance is one of the most commonly used temperature detectors in the medium and low temperature regions. Its main features are high measuring accuracy and stable performance. Among them, the platinum thermistor has the highest measurement accuracy, and is widely used in industrial temperature measurement and is made into a standard reference instrument. The principle of thermal resistance temperature measurement is based on the property that the resistance value of a conductor or semiconductor changes with temperature. The thermal resistor is mostly made of pure metal materials, the most widely used at present are platinum and copper, and the thermal resistor is made of materials such as nickel, manganese and rhodium.
At present, most of temperature measuring instruments on the market adopt a single measuring means, either only use a thermocouple or only use a thermal resistor, so that the adverse effect caused by the fact that the temperature measuring instrument which only adopts the thermal resistor cannot measure high temperature, the measurement precision of the temperature measuring instrument which only adopts the thermocouple is not high, and the temperature measuring instrument is not suitable for some high-precision measurement industries. In addition, the existing temperature measuring circuit has unstable signal performance and some unnecessary line group loss.
Disclosure of Invention
The utility model aims to solve the technical problem that a temperature controller temperature measurement circuit is provided, the problem that the temperature measuring instrument that can solve the pure thermal resistance can not measure high temperature and the not high temperature measuring instrument measurement accuracy who adopts the thermocouple simply brings can reduce the temperature measurement loss again simultaneously, improves economic benefits.
In order to solve the technical problem, the utility model provides a temperature measuring circuit of a temperature controller, which comprises an input detection circuit and a signal analysis circuit; the input detection circuit comprises an analog switch controller, a cold end compensation circuit, a thermocouple temperature measurement circuit, a thermal resistance temperature measurement circuit and a circuit error compensation circuit; when the thermocouple is used for measuring temperature, the input end of the analog switch controller is respectively communicated with the cold end compensation circuit, the thermocouple temperature measurement circuit and the circuit error compensation circuit; when the thermal resistance is adopted for temperature measurement, the input end of the analog switch controller is respectively communicated with the thermal resistance temperature measurement circuit and the circuit error compensation circuit; the signal analysis circuit comprises an integrator, a triode, a first D trigger and a second D trigger; the negative input end of the integrator is connected with the output end of the analog switch controller, the positive input end of the integrator is connected with the output end of the first D trigger, and the output end of the integrator is connected with the base electrode of the triode; the input end of the first D trigger is respectively connected with the reverse output end of the first D trigger and the collector of the triode, the reverse output end of the first D trigger is connected with the pulse metering end, and the clock end of the first D trigger is connected with the output end of the second D trigger; the input end of the second D trigger is connected with the reverse output end of the second D trigger, and the clock end of the second D trigger is connected with a clock signal source.
Preferably, the thermocouple temperature measuring circuit comprises a thermocouple, a first capacitor, a first resistor, a second capacitor, a second resistor, a third capacitor and a third resistor; one end of the first capacitor is grounded and connected with the negative input end of the thermocouple, and the other end of the first capacitor is connected with a power supply; one end of the first resistor is connected with the positive input end of the thermocouple, and the other end of the first resistor is connected with the power supply; one end of the second capacitor is connected with the positive input end of the thermocouple, and the other end of the second capacitor is grounded; one end of the second resistor is connected with the positive input end of the thermocouple, and the other end of the second resistor is grounded through a third capacitor and is connected with the input end of the analog switch controller through a third resistor.
Preferably, the thermal resistance temperature measurement circuit comprises a thermal resistance, a first capacitor, a fourth resistor, a fourth capacitor, a fifth resistor, a fifth capacitor and a sixth resistor; one end of the first capacitor is grounded and connected with the negative input end of the thermal resistor, and the other end of the first capacitor is connected with a power supply; one end of the fourth resistor is connected with the power supply, and the other end of the fourth resistor is connected with the positive input end of the thermal resistor; one end of the fourth capacitor is connected with the positive input end of the thermal resistor, and the other end of the fourth capacitor is grounded; one end of the fifth resistor is connected with the positive input end of the thermal resistor, and the other end of the fifth resistor is grounded through a fifth capacitor and connected with the input end of the analog switch controller through a sixth resistor.
Preferably, the cold end compensation circuit comprises a diode, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor and a sixth capacitor; the anode of the diode is grounded, and the cathode of the diode is connected with a power supply through a seventh resistor; one end of the eighth resistor is connected with the cathode of the diode, and the other end of the eighth resistor is grounded through a ninth resistor and connected with the input end of the analog switch controller through a tenth resistor; one end of the sixth capacitor is grounded, and the other end of the sixth capacitor is connected with the input end of the analog switch controller.
Preferably, the circuit error compensation circuit comprises a compensation resistor, one end of the compensation resistor is connected with the input end of the analog switch controller, and the other end of the compensation resistor is grounded.
Preferably, the signal analysis circuit further includes a first current limiting resistor and a second current limiting resistor, and the negative input terminal of the integrator is connected to the output terminal of the analog switch controller through the first current limiting resistor and is connected to the power supply through the second current limiting resistor.
Preferably, a voltage follower is arranged between the input detection circuit and the signal analysis circuit, a positive input end of the voltage follower is connected with an output end of the analog switch controller, and an output end of the voltage follower is connected with a negative input end of the integrator through a first current limiting resistor.
Preferably, the signal analysis circuit further comprises a third current limiting resistor, and the output end of the integrator is connected with the base of the triode through the third current limiting resistor.
Preferably, the signal analyzing circuit further includes a first voltage dividing resistor and a second voltage dividing resistor, and the positive input terminal of the integrator is connected to the output terminal of the first D flip-flop through the first voltage dividing resistor and is grounded through the second voltage dividing resistor.
Preferably, the signal analyzing circuit further includes a third voltage dividing resistor and a fourth voltage dividing resistor, the input terminal of the first D flip-flop is connected to the inverted output terminal of the first D flip-flop through the third voltage dividing resistor, and the inverted output terminal of the first D flip-flop is grounded through the fourth voltage dividing resistor.
Implement the utility model has the advantages that:
the utility model discloses an analog switch controller can enough select the thermocouple temperature measurement, can select the thermal resistance temperature measurement again, and it is wide to possess the temperature measurement scope, and measurement accuracy is high, and advantages such as circuit structure is simple, simultaneously, the utility model provides a cold junction compensating circuit and circuit error compensating circuit can reduce measuring error, further improve measurement accuracy.
The utility model discloses a be equipped with the voltage follower between input detection circuitry and signal analysis circuit, because the input impedance of voltage follower is very big, output impedance is very little, therefore, can see that input signal connects a very big resistance to the ground, constitute a bleeder circuit with preceding line resistance of walking like this, for very big resistance, walk the line resistance and can ignore, so the signal of input gets into next level processing circuit almost without the loss, further improved measurement accuracy.
Drawings
FIG. 1 is a schematic diagram of a temperature measuring circuit of the temperature controller of the present invention;
FIG. 2 is a schematic diagram of an input detection circuit in the temperature measurement circuit of the temperature controller of the present invention;
fig. 3 is a schematic diagram of a signal analysis circuit in the temperature measurement circuit of the temperature controller.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings. Only this statement, the utility model discloses the upper and lower, left and right, preceding, back, inside and outside etc. position words that appear or will appear in the text only use the utility model discloses an attached drawing is the benchmark, and it is not right the utility model discloses a concrete restriction.
As shown in fig. 1, fig. 1 shows a circuit diagram of a temperature measuring circuit of a temperature controller of the present invention, which includes an input detection circuit and a signal analysis circuit. Specifically, the method comprises the following steps:
the input detection circuit comprises an analog switch controller, a cold end compensation circuit, a thermocouple temperature measurement circuit, a thermal resistance temperature measurement circuit and a circuit error compensation circuit. When the thermocouple is used for measuring temperature, the input end of the analog switch controller is respectively communicated with the cold end compensation circuit, the thermocouple temperature measurement circuit and the circuit error compensation circuit; when the thermal resistance is used for measuring temperature, the input end of the analog switch controller is respectively communicated with the thermal resistance temperature measuring circuit and the circuit error compensation circuit.
The signal analysis circuit comprises an integrator, a triode, a first D trigger and a second D trigger; the negative input end of the integrator is connected with the output end of the analog switch controller, the positive input end of the integrator is connected with the output end of the first D trigger, and the output end of the integrator is connected with the base electrode of the triode; the input end of the first D trigger is respectively connected with the reverse output end of the first D trigger and the collector electrode of the triode, the reverse output end of the first D trigger is connected with a pulse metering end P (the utility model discloses a pulse number of the reverse output end output signal of the first D trigger is solved through being connected to a singlechip, the frequency value of the signal is further obtained), and the clock end of the first D trigger is connected with the output end of the second D trigger; the input end of the second D trigger is connected with the reverse output end of the second D trigger, and the clock end of the second D trigger is connected with a clock signal source M.
Therefore, the utility model provides an input detection circuitry can select the thermocouple input through analog switch controller, can select the hot resistance input again, and it is wide to possess the temperature measurement scope, advantage that measurement accuracy is high. And simultaneously, the utility model provides a temperature controller temperature measurement circuit, through integrator, triode, first D trigger and the signal analysis circuit that the second D trigger is constituteed try to the frequency of a charge-discharge cycle of integrator, the voltage value of input integrator is reversely derived, rethread thermal resistance or thermocouple graduation meter, just can calculate specific temperature value.
As shown in fig. 2, the input detection circuit includes an analog switch controller, a cold junction compensation circuit 3, a thermocouple temperature measurement circuit 1, a thermal resistance temperature measurement circuit 2, and a circuit error compensation circuit 4. The utility model discloses the analog switch controller of preferred chooseing for use is 74HC4051, but is not limited to this, and the chip that only can realize the passageway and select the function just can be applicable to the utility model discloses. The analog switch controller comprises three control terminals (a terminal, a terminal B and a terminal C), eight input terminals (X0, X1, X2, X3, X4, X5, X6 and X7) and an output terminal X, wherein the X0, the X1, the X3 and the X5 are grounded, the X2, the X4, the X6 and the X7 are respectively connected with the cold-end compensation circuit 3, the thermocouple temperature measurement circuit 1, the thermal resistance temperature measurement circuit 2 and the circuit error compensation circuit 4, the three control terminals are used for gating input terminals to be output, and the output terminal X is used for outputting signals to the signal analysis circuit.
The thermocouple temperature measuring circuit 1 comprises a thermocouple (not shown in the figure), a first capacitor C1, a first resistor R1, a second capacitor C2, a second resistor R2, a third capacitor C3 and a third resistor R3; one end of the first capacitor C1 is grounded and connected with the negative input end J1 of the thermocouple, and the other end of the first capacitor C1 is connected with a power supply (+ 5V); one end of the first resistor R1 is connected with the positive input end J2 of the thermocouple, and the other end is connected with a power supply; one end of the second capacitor C2 is connected with the positive input end J2 of the thermocouple, and the other end is grounded; one end of the second resistor R2 is connected with the positive input end J2 of the thermocouple, and the other end is grounded through a third capacitor C3 and connected with the input end X4 of the analog switch controller through a third resistor R3.
The thermal resistance temperature measuring circuit 2 comprises a thermal resistance (not shown in the figure), a first capacitor C1, a fourth resistor R4, a fourth capacitor C4, a fifth resistor R5, a fifth capacitor C5 and a sixth resistor R6; one end of the first capacitor C1 is grounded and connected with the negative input end J1 of the thermal resistor, and the other end of the first capacitor C1 is connected with a power supply; one end of the fourth resistor R4 is connected with a power supply, and the other end of the fourth resistor R4 is connected with the positive input end J3 of the thermal resistor; one end of the fourth capacitor C4 is connected with the positive input end J3 of the thermal resistor, and the other end is grounded; one end of the fifth resistor R5 is connected to the positive input terminal J3 of the thermal resistor, and the other end is connected to the ground through a fifth capacitor C5 and to the input terminal X6 of the analog switch controller through a sixth resistor R6, respectively.
The cold end compensation circuit 3 comprises a diode, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and a sixth capacitor C6; the anode of the diode is grounded, and the cathode of the diode is connected with a power supply through a seventh resistor R7; one end of the eighth resistor R8 is connected with the cathode of the diode, and the other end of the eighth resistor R8 is respectively connected with the ground through a ninth resistor R9 and the input end X2 of the analog switch controller through a tenth resistor R10; one end of the sixth capacitor C6 is grounded, and the other end is connected with the input end X2 of the analog switch controller. The utility model provides a cold junction compensating circuit C carries out the cold junction compensation to thermocouple temperature measurement circuit through the temperature characteristic of diode, can reduce measuring error, further improves measurement accuracy.
The circuit error compensation circuit 4 comprises a compensation resistor R11, wherein one end of the compensation resistor R11 is connected with the input terminal X7 of the analog switch controller, and the other end is grounded. The utility model provides a circuit error compensation circuit can reduce measuring error, further improves measurement accuracy.
As shown in fig. 3, the signal analyzing circuit further includes a first current limiting resistor R12, a second current limiting resistor R13, a third current limiting resistor R15, a first voltage dividing resistor R16, a second voltage dividing resistor R14, a third voltage dividing resistor R18, and a fourth voltage dividing resistor R17.
The output end of the integrator is connected with the base of a triode Q3 through a third current limiting resistor R15; the negative input end of the integrator is connected with the output end of the analog switch controller through a first current limiting resistor R12 and is connected with a power supply through a second current limiting resistor R13; the positive input end of the integrator is connected with the output end of the first D flip-flop through a first voltage-dividing resistor R16 and is grounded through a second voltage-dividing resistor R14. The input end of the first D flip-flop is connected with the inverted output end of the first D flip-flop through a third voltage dividing resistor R18, and the inverted output end of the first D flip-flop is grounded through a fourth voltage dividing resistor R17.
Further, a voltage follower is arranged between the input detection circuit and the signal analysis circuit, a positive input end of the voltage follower is connected with an output end X of the analog switch controller, and an output end of the voltage follower is connected with a negative input end of the integrator through a first current limiting resistor R12. The utility model discloses a be equipped with the voltage follower between input detection circuitry and signal analysis circuit, because the input impedance of voltage follower is very big, output impedance is very little, therefore, can see that input signal connects a very big resistance to the ground, constitute a bleeder circuit with preceding line resistance of walking like this, for very big resistance, walk the line resistance and can ignore, so the signal of input gets into next level processing circuit almost without the loss, further improved measurement accuracy.
The utility model discloses a signal analysis circuit, through calculating the frequency that pulse number got charge-discharge cycle, rethread circuit analysis and derivation calculate the voltage value of input, and then get the temperature value that corresponds. Firstly, the principle of the integrator is to realize integration operation by charging and discharging a feedback capacitor C7; the output end Q of the first D flip-flop D1 is connected to the positive input end of the integrator after passing through a voltage divider circuit, and the output end Q is controlled by the input end D of the first D flip-flop D1, when the input end D is at a high level, the output end Q also inputs a high level, otherwise outputs a low level, and meanwhile, the output of the first D flip-flop D1 is controlled by a clock signal, and when the rising edge of the clock signal CLK of the first D flip-flop D1 comes, the output state changes with the change of the input end. Assuming that the clock signal CLK has a frequency of 1MHz, assuming that the input end D of the first D flip-flop D1 is initially at a low level, when power is turned on and the rising edge of the CLK signal of the first D flip-flop D1 arrives, the output end Q outputs a low level, and enters the positive input end of the integrator through the voltage divider circuit formed by R16 and R14, and the voltage U + at the positive input end of the corresponding integrator is also at a low level. According to the 'virtual short and virtual break' characteristic of the operational amplifier, the circuit charges C7, when C7 is charged, the voltage on C7 increases approximately linearly, and the voltage on the output end V0 of the integrator decreases approximately linearly, so that the base current of the transistor Q3 decreases, the current on the base decreases, the current on the collector decreases, and the voltage drop (Ur17) on R17 decreases. Since the voltage Ud at the input D of the first D flip-flop D1 may be approximately equal to Ud ≈ Uq — Ur17 (where Uq — is the voltage at the inverted output Q of the first D flip-flop D1), Ud becomes large since Uq — is constant and Ur17 becomes small, and when Ud is greater than the threshold voltage of the first D flip-flop D1, the first D flip-flop D1 flips to output high when the rising edge of CLK comes, that is, the output Q is high. When the output end Q outputs a high level, the voltage U + at the positive input end of the integrator is also a high level, according to the virtual short and virtual break characteristics of the operational amplifier, C7 discharges at this time, when C7 discharges, the voltage on C7 becomes small, Vo increases, the base current of the triode Q3 is large, and the current of the collector also becomes large, so that Ur17 becomes large, as known from Ud ≈ Uq — Ur17, Ud becomes small, when the voltage is smaller than the threshold voltage of the first D flip-flop D1, when the rising edge of CLK comes, the first D flip-flop D1 flips and outputs a low level, and then the capacitor C7 completes a charge and discharge process, that is, a working process. The above operation is repeated later. The discharge time T is the reciprocal of the clock signal (1MHz) to be referenced, and since U ═ U + is discharged and U + is clocked by CLK (1MHz) to be referenced, the duration of U + is the reciprocal of the clock signal (1 MHz).
The calculation process is as follows:
from the charge-discharge charge balance of the capacitor C7, it is found that:
q charging (1)
Q charging ═ I charging T charging (2)
During charging, U-is equal to 0, wherein U-is the voltage of the negative input end of the integrator
T charging ═ T period-T discharging (3)
I charge (Vin/R12) + (5/R13), where Vin is the output voltage (4) at output terminal X
At discharge, the discharge time T is the inverse of the clock signal (1MHz) referenced, i.e.
T put-1/1M 1/(1 x 106) 1Us (5)
U-＝U+＝Uq*[R14/(R14+R16)] (6)
Q put ═ I put T put (7)
I-m-I3-I1, wherein I3 is the current through R12, I1 is the current through R13 (8)
I3＝(U-－Vin)/R12 (9)
I1＝(5－U-)/R13 (10)
From the formulae (7), (8) and (9), it is possible to obtain:
i put ═ [ (U- -Vin)/R12 ] - [ (5-U-)/R13 ] (11)
F1/T cycle (12)
The combination of formulae (1) to (12) yields:
and I, putting T, namely I, charging T, and the specific derivation process is as follows:
[ (U- -Vin)/R12 ] - [ (5-U-)/R13 ]. T put ═ (Vin/R12) + (5/R13) T cycle-T put)
→ [ (U-/R12) + (U-/R13) ]. T.T.cycle [ (Vin/R12) + (5/R13) ]. T.
→ F ═ 1/T cycle ═ 1 [ (Vin/R12) + (5/R13) ]/{ [ (U-/R12) + (U-/R13) ] × T put } (where T put ═ 10^ -6s)
→ F { [ (Vin/R12) + (5/R13) ]/[ (U-/R12) + (U-/R13) ] } 10^6 (unit is Hz) (13)
According to the equation (13), since the voltage drop in R12 is negligible, that is, Vin ≈ U-, according to the operational amplifier characteristics, the value of Vin can be inversely deduced by substituting the value of F (the frequency obtained by calculating the number of pulses through the pulse measurement end P), and the corresponding temperature value can be deduced according to the thermocouple or thermal resistance.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (10)
1. A temperature measuring circuit of a temperature controller is characterized by comprising an input detection circuit and a signal analysis circuit;
the input detection circuit comprises an analog switch controller, a cold end compensation circuit, a thermocouple temperature measurement circuit, a thermal resistance temperature measurement circuit and a circuit error compensation circuit;
the signal analysis circuit comprises an integrator, a triode, a first D trigger and a second D trigger;
the negative input end of the integrator is connected with the output end of the analog switch controller, the positive input end of the integrator is connected with the output end of the first D trigger, and the output end of the integrator is connected with the base electrode of the triode;
the input end of the first D trigger is respectively connected with the reverse output end of the first D trigger and the collector of the triode, the reverse output end of the first D trigger is connected with the pulse metering end, and the clock end of the first D trigger is connected with the output end of the second D trigger;
the input end of the second D trigger is connected with the reverse output end of the second D trigger, and the clock end of the second D trigger is connected with a clock signal source.
2. The temperature sensing circuit of claim 1, wherein the thermocouple temperature sensing circuit comprises a thermocouple, a first capacitor, a first resistor, a second capacitor, a second resistor, a third capacitor, and a third resistor;
one end of the first capacitor is grounded and connected with the negative input end of the thermocouple, and the other end of the first capacitor is connected with a power supply;
one end of the first resistor is connected with the positive input end of the thermocouple, and the other end of the first resistor is connected with the power supply;
one end of the second capacitor is connected with the positive input end of the thermocouple, and the other end of the second capacitor is grounded;
one end of the second resistor is connected with the positive input end of the thermocouple, and the other end of the second resistor is grounded through a third capacitor and is connected with the input end of the analog switch controller through a third resistor.
3. The temperature sensing circuit of claim 1, wherein the thermal resistance temperature sensing circuit comprises a thermal resistance, a first capacitor, a fourth resistor, a fourth capacitor, a fifth resistor, a fifth capacitor, and a sixth resistor;
one end of the first capacitor is grounded and connected with the negative input end of the thermal resistor, and the other end of the first capacitor is connected with a power supply;
one end of the fourth resistor is connected with the power supply, and the other end of the fourth resistor is connected with the positive input end of the thermal resistor;
one end of the fourth capacitor is connected with the positive input end of the thermal resistor, and the other end of the fourth capacitor is grounded;
one end of the fifth resistor is connected with the positive input end of the thermal resistor, and the other end of the fifth resistor is grounded through a fifth capacitor and connected with the input end of the analog switch controller through a sixth resistor.
4. The temperature sensing device thermometric circuit of claim 1, wherein the cold end compensation circuit comprises a diode, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, and a sixth capacitor;
the anode of the diode is grounded, and the cathode of the diode is connected with a power supply through a seventh resistor;
one end of the eighth resistor is connected with the cathode of the diode, and the other end of the eighth resistor is grounded through a ninth resistor and connected with the input end of the analog switch controller through a tenth resistor;
one end of the sixth capacitor is grounded, and the other end of the sixth capacitor is connected with the input end of the analog switch controller.
5. The temperature sensing circuit of claim 1, wherein the circuit error compensation circuit comprises a compensation resistor having one end connected to the input of the analog switch controller and the other end connected to ground.
6. The temperature sensing circuit of claim 1, wherein the signal analyzing circuit further comprises a first current limiting resistor and a second current limiting resistor, and the negative input terminal of the integrator is connected to the output terminal of the analog switch controller via the first current limiting resistor and to the power supply via the second current limiting resistor.
7. The temperature measuring circuit of the temperature controller according to claim 6, wherein a voltage follower is provided between the input detection circuit and the signal analysis circuit, a positive input terminal of the voltage follower is connected to an output terminal of the analog switch controller, and an output terminal of the voltage follower is connected to a negative input terminal of the integrator through a first current limiting resistor.
8. The temperature sensing circuit of claim 1, wherein the signal analyzing circuit further comprises a third current limiting resistor, and the output terminal of the integrator is connected to the base of the transistor through the third current limiting resistor.
9. The temperature sensing circuit of claim 1, wherein the signal analyzing circuit further comprises a first voltage dividing resistor and a second voltage dividing resistor, and the positive input terminal of the integrator is connected to the output terminal of the first D flip-flop through the first voltage dividing resistor and is grounded through the second voltage dividing resistor.
10. The temperature sensing circuit of claim 1, wherein the signal analyzing circuit further comprises a third voltage dividing resistor and a fourth voltage dividing resistor, the input terminal of the first D flip-flop is connected to the inverted output terminal of the first D flip-flop through the third voltage dividing resistor, and the inverted output terminal of the first D flip-flop is grounded through the fourth voltage dividing resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920269237.8U CN209820642U (en) | 2019-03-04 | 2019-03-04 | Temperature measuring circuit of temperature controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920269237.8U CN209820642U (en) | 2019-03-04 | 2019-03-04 | Temperature measuring circuit of temperature controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209820642U true CN209820642U (en) | 2019-12-20 |
Family
ID=68874746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920269237.8U Active CN209820642U (en) | 2019-03-04 | 2019-03-04 | Temperature measuring circuit of temperature controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209820642U (en) |
-
2019
- 2019-03-04 CN CN201920269237.8U patent/CN209820642U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107014507A (en) | A kind of built-in temperature sensor and its temperature checking method based on RC oscillators | |
| CN104067097A (en) | High resolution temperature measurement | |
| CN104833437A (en) | Pulse width signal generation circuit applied to digital CMOS temperature sensor | |
| CN209820642U (en) | Temperature measuring circuit of temperature controller | |
| CN207896948U (en) | A kind of electronic switching circuit for eliminating microcontroller current detection circuit amplifier temperature drift | |
| CN110044510A (en) | IGBT module temperature measurement circuit, temp measuring method and computer readable storage medium | |
| US4237420A (en) | Temperature sensing circuit | |
| RU2502076C1 (en) | Microcontroller metering converter of resistance into binary code with voltage-controlled generator | |
| CN203069291U (en) | Thermistor-based temperature detection circuit | |
| CN109724711B (en) | Temperature sensor and temperature sensing method | |
| CN209055244U (en) | A kind of circuit and its temperature measurement circuit for simulating thermistor | |
| CN109932074A (en) | A kind of temperature controller temperature measurement circuit | |
| US4090151A (en) | Temperature sensing device for producing alternating electric signals whose period is a function of a temperature | |
| Tan et al. | A low-voltage low-power CMOS time-domain temperature sensor accurate to within [− 0.1,+ 0.5]° C From− 40° C To 125° C | |
| CN203164266U (en) | Power source voltage measuring device, temperature detection device equipped with power source voltage measuring device, and temperature controller | |
| SU1016696A1 (en) | Device for measuring temperature having frequency output | |
| CN204422094U (en) | Temperature measurement circuit and electromagnetic oven | |
| EP1070965A2 (en) | Method for measuring an electric voltage and arrangement for implementing the method | |
| RU2565813C1 (en) | Microcontroller-based converter of resistance, capacitance and voltage into binary code | |
| Friedl et al. | A new resistance-to-frequency converter for temperature measurements in calorimeters | |
| US3417328A (en) | In-circuit inductance measuring circuit | |
| US20240133751A1 (en) | Temperature-sensing data processing module and temperature sensor | |
| JP5447979B2 (en) | Temperature measuring instrument | |
| Kazmi | IMPLEMENTATION OF WIRE RESISTANCE COMPENSATION TECHNIQUE ON DIRECT SENSOR TO ATMEL 89C51 MICROCONTROLLER INTERFACE | |
| SU998976A1 (en) | Device for measuring rlc parameters |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |