CN217425999U - Novel constant temperature controller circuit of heater - Google Patents
Novel constant temperature controller circuit of heater Download PDFInfo
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- CN217425999U CN217425999U CN202122678442.XU CN202122678442U CN217425999U CN 217425999 U CN217425999 U CN 217425999U CN 202122678442 U CN202122678442 U CN 202122678442U CN 217425999 U CN217425999 U CN 217425999U
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- 238000001514 detection method Methods 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 description 8
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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Abstract
The utility model discloses a novel constant temperature controller circuit of a heater, which comprises a power supply, a temperature detection circuit, a heater, a switch tube, a comparator X1 and a temperature reference; the heater and the switch tube are connected in series at two ends of the power supply; the temperature detection circuit is formed by connecting a thermistor and a resistor in series and is connected to two ends of a power supply, and the voltage of the middle point represents a temperature signal; the temperature reference is composed of two resistors connected in series and connected to two ends of a power supply, the voltage of the middle point is used as the temperature reference voltage, the temperature signal and the reference voltage are respectively connected with the reverse input and the same input of a comparator, the output of the comparator is connected with the gate pole of a switching tube to control the on or off of the heater, and further control the effective output power of the heater to realize constant temperature control.
Description
Technical Field
The utility model belongs to the temperature control field especially relates to a thermostatic control ware circuit of heater.
Background
Under different temperature conditions, the performance of electronic devices may vary, i.e., the temperature drift in general; high-precision devices: such as an amplifying circuit, a reference, a crystal oscillator, etc., if the ambient temperature can be controlled to be constant, the accuracy consistency of the measurement can be realized after the verification. At present, a plurality of types of constant temperature control circuits are provided, but the constant temperature control circuits are mostly realized in a mode of controlling a constant current source through a triode, the problem of heating of the triode exists, particularly when a heater is used for heating a specific device, the heating of the triode is not necessary for a heating system, and therefore the efficiency of the heating system is not high.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and invent a controller circuit of a constant temperature heater.
The invention uses a negative temperature coefficient resistor to sense the temperature, then compares with a temperature reference, the output of the comparator controls a MOSFET for switch, controls the start of the heating device. Because the MOSFET is in the on-off state, it does not have much conduction loss by itself, thereby improving the efficiency of the heating system.
Drawings
The present invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is a schematic diagram of a thermostat control circuit for a novel heater.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
A constant temperature controller circuit comprises a power supply Vcc, a temperature detection circuit, a heating resistor R5, a switching tube Q1, a resistor R4, a comparator X1, a hysteresis circuit and a temperature reference circuit; the output end of the comparator X1 is connected with the driving electrode of the switch tube Q1, the source electrode of Q1 is grounded, the drain electrode is connected with one end of the heater R5, and the other end of the R5 is connected with the anode of a power supply VCC; the temperature detection circuit comprises a thermistor Rt and a resistor R4, wherein one end of the Rt is connected with a positive electrode of a power supply VCC, the other end of the Rt is respectively connected with one end of a resistor R4 and the reverse input end of a comparator X1, and the other end of the R4 is connected with the ground of the VCC; the hysteresis circuit is formed by connecting a resistor R3 and a diode D1 in series and is connected between the homodromous end and the output end of the comparator X1, and the anode of the diode D1 faces the homodromous end of the comparator X1; the temperature reference is composed of R1 and R2, one end of a resistor R1 is connected with the anode of VCC, the other end is connected with the same-direction input end of R2 and a comparator X1, and the other end of R2 is connected with the ground of VCC.
The voltage of the equidirectional input end of the comparator X1 is determined by the voltage division of VCC by R1 and R2, and is used as the reference voltage of the comparator X1; since the NTC is a thermistor with a negative temperature coefficient, the higher the temperature is, the smaller the resistance value of the thermistor Rt is; assuming that the ratio of the resistance values of Rt and R4 is equal to the ratio of the resistance values of R1 and R2 at the temperature of T0, that is, the input voltage of the reverse terminal of the comparator X1 is equal to the reference voltage, when the temperature sensed by Rt is lower than T0, the resistance value of Rt becomes larger, the voltage of the reverse terminal of the comparator X1 decreases and is lower than the reference voltage of the same terminal, the comparator X1 outputs a high level, Q1 is fully turned on, and the heater R5 operates; when the temperature sensed by the Rt is higher than T0, the resistance value of the Rt is reduced, the voltage of the reverse input end of the comparator X1 is increased and is higher than the reference voltage of the same direction end, the comparator X1 outputs low level, the Q1 is turned off, and the heater R5 stops. Since Q1 is always in a fully on or off state and is not operating in the linear region or amplification state, the loss of Q1 itself is relatively small. The series connection of R3 and diode D1 provides a hysteresis for the state transition of the comparator X1, which can reduce the switching frequency of Q1. The effective output power of the heater is controlled by controlling the on or off of the heater, so that the constant temperature control is realized.
Since the final result of the control is that the ratio of the resistances of Rt and R4 is equal to the ratio of the resistances of R1 and R2, the influence of the voltage transformation of VCC on the control target value is eliminated.
While the disclosure has been disclosed by the description of the specific embodiments thereof, it will be appreciated that those skilled in the art will be able to devise various modifications, improvements, or equivalents of the disclosure within the spirit and scope of the appended claims. Such modifications, improvements and equivalents are also intended to be included within the scope of the present disclosure.
Claims (4)
1. A novel constant temperature controller circuit of a heater is characterized by comprising a power supply, a temperature detection circuit, the heater, a switch tube, a comparator X1 and a temperature reference circuit; the heater and the switch tube are connected in series at two ends of the power supply; the output of the temperature detection circuit and the output of the temperature reference circuit are respectively connected with the reverse input and the same input of the comparator X1, and the output of the comparator X1 is connected with the driving pole of the switching tube.
2. The thermostat control circuit of claim 1 wherein the temperature sensing circuit includes a thermistor and a first resistor connected in series across the power supply, the intermediate connection being the output of the temperature sensing circuit.
3. The thermostat control circuit of claim 1 wherein the temperature reference circuit includes a second resistor and a third resistor, the second resistor and the third resistor being connected in series across the power supply, the intermediate connection being the temperature reference output.
4. The thermostat control circuit of claim 1, comprising a hysteresis circuit connected between the non-inverting input terminal and the output terminal of the comparator X1, the hysteresis circuit comprising a fourth resistor and a diode D1 connected in series, wherein the cathode of the diode D1 faces the output terminal of the comparator X1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122678442.XU CN217425999U (en) | 2021-11-04 | 2021-11-04 | Novel constant temperature controller circuit of heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122678442.XU CN217425999U (en) | 2021-11-04 | 2021-11-04 | Novel constant temperature controller circuit of heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217425999U true CN217425999U (en) | 2022-09-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122678442.XU Active CN217425999U (en) | 2021-11-04 | 2021-11-04 | Novel constant temperature controller circuit of heater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217425999U (en) |
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2021
- 2021-11-04 CN CN202122678442.XU patent/CN217425999U/en active Active
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| GR01 | Patent grant | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20231113 Address after: Building A, Building 108, Xinzheng Factory, Zone 71, Xingdong Community, Xin'an Street, Bao'an District, Shenzhen City, Guangdong Province, 518000 Patentee after: Shenzhen Huada New Energy Technology Co.,Ltd. Address before: 518101 Chuangwei Innovation Valley 2 # B1331, No. 8 Tangtou 1st Road, Tangtou Community, Shiyan Street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Chaoda Investment Partnership (Limited Partnership) |