CN101788830A - Digital temperature control circuit - Google Patents
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- CN101788830A CN101788830A CN 201010109400 CN201010109400A CN101788830A CN 101788830 A CN101788830 A CN 101788830A CN 201010109400 CN201010109400 CN 201010109400 CN 201010109400 A CN201010109400 A CN 201010109400A CN 101788830 A CN101788830 A CN 101788830A
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Abstract
The invention provides a digital temperature control circuit, belongs to the technical field of electronics and solves the problem of low heating power control accuracy which occurs in a conventional temperature control circuit when an alternating power supply frequency is unstable. The digital temperature control circuit comprises a power supply circuit, a digital micro-control circuit, a temperature detection circuit and a power control circuit, and also comprises a semi-cycle cycle counting circuit, wherein a voltage output end of the power supply circuit is connected with voltage input ends of the digital micro-control circuit, the temperature detection circuit and the semi-cycle cycle counting circuit respectively; a counting control output end of the semi-cycle cycle counting circuit is connected with a counting control input end of the digital micro-control circuit; a temperature control output end of the temperature detection circuit is connected with a temperature detection input end of the digital micro-control circuit; a failure control output end of the temperature detection circuit is connected with a failure detection input end of the digital micro-control circuit; and a power control output end of the digital micro-control circuit is connected with a power control input end of the power control circuit. The digital temperature control circuit realizes accurate control of temperature and is used for controlling the temperature.
Description
Technical field
The present invention relates to a kind of temperature-control circuit, belong to electronic technology field.
Background technology
Temperature-control circuit generally includes power-supplying circuit, digital micro-control circuit, temperature sensing circuit and power control circuit, for satisfying special requirement, also can add auxiliary functional circuits such as data presentation and failure alarm circuit in the practical application.
At present, temperature-control circuit has adopted the zero cross fired bidirectional triode thyristor to realize power control circuit widely, yet sort circuit is under the timing control model, the instability of ac energisation frequency may cause actual turn-on cycle number to have deviation, and then causes carrying out high-precision heating power control.
Summary of the invention
In order to overcome the low problem of heating power control accuracy that existing temperature-control circuit occurs when ac energisation frequency is unstable, the invention provides a kind of digital temperature control circuit.
The present invention is achieved by following proposal: digital temperature control circuit, it comprises power-supplying circuit, numeral micro-control circuit, temperature sensing circuit and power control circuit, it also comprises half cycle cycle counting circuit, the voltage output end of power-supplying circuit links to each other with the voltage input end of digital micro-control circuit and temperature sensing circuit respectively, half cycle cycle counting circuit is by Industrial Frequency Transformer, full bridge rectifier, resistance R 1, resistance R 2 and a photoelectrical coupler are formed, two output terminals of two input termination electric mains of Industrial Frequency Transformer, an output terminal of Industrial Frequency Transformer is connected with an input end of full bridge rectifier, another output terminal of Industrial Frequency Transformer is connected with another input end of full bridge rectifier, an output terminal of full bridge rectifier links to each other with an end of resistance R 1, the other end of resistance R 1 links to each other with the input end of light emitting diode in photoelectrical coupler, another output terminal of full bridge rectifier links to each other with the output terminal of light emitting diode in photoelectrical coupler, in photoelectrical coupler the collector of phototriode respectively with the counting control input end of digital micro-control circuit, one end of resistance R 2 connects, the other end of resistance R 2 links to each other with the voltage output end of power-supplying circuit, the grounded emitter of phototriode in photoelectrical coupler, the base stage of phototriode is unsettled, the temperature control output end of temperature sensing circuit links to each other with the temperature detection input end of digital micro-control circuit, the fail-safe control output terminal of temperature sensing circuit links to each other with the fault detect input end of digital micro-control circuit, and the power control output end of digital micro-control circuit links to each other with the power control input end of power control circuit.
The present invention is on the basis of existing temperature-control circuit, design has half cycle cycle counting circuit, it utilizes transformer with the electric main step-down, and obtain the pulsating direct current that frequency is 2 times of mains frequencies by full bridge rectifier, this pulsating direct current output links to each other with the optocoupler input end by current-limiting resistance, the optocoupler output terminal connects direct supply by pull-up resistor, is connected to the counting control input end of digital micro-control circuit simultaneously.When required power was exported, digital micro-control circuit enabled the bidirectional triode thyristor trigger circuit, and unison counter to the rising edge counting, when count value reaches setting value, is closed controllable silicon after first negative edge appears in input.Therefore, the minimal adjustment step-length of output power is the output power of the semiperiod correspondence of electric main.Because not triggered, counting process do not enable constantly the influence of electric main cycle relative position and ac frequency fluctuation relatively, the inaccurate problem of actual conducting half cycle number that bidirectional triode thyristor brings when therefore having avoided using output ON time control mode.
The present invention has improved temperature controlled precision taking into account that circuit is oversimplified and cheaply on the basis, having solved the problem that bidirectional triode thyristor exists in output power control.Based on circuit of the present invention, in conjunction with actual temperature control programmed algorithm, can have that circuit structure is simple, a system stability, applied widely, the advantage of being convenient to promotion and implementation for multi-field different temperature control requires to provide the controller that has practical value scheme, the present invention.
Description of drawings
Fig. 1 is the synoptic diagram of embodiment one; Fig. 2 is the synoptic diagram of embodiment three; Fig. 3 is the synoptic diagram of embodiment four; Fig. 4 is the synoptic diagram of embodiment five.
Embodiment
Embodiment one: specify present embodiment below in conjunction with Fig. 1.Digital temperature control circuit, it comprises power-supplying circuit 1, numeral micro-control circuit 2, temperature sensing circuit 3 and power control circuit 4, it also comprises half cycle cycle counting circuit 5, the voltage output end of power-supplying circuit 1 links to each other with the voltage input end of digital micro-control circuit 2 and temperature sensing circuit 3 respectively, half cycle cycle counting circuit 5 is by Industrial Frequency Transformer B, full bridge rectifier D, resistance R 1, resistance R 2 and a photoelectrical coupler OC1 form, two output terminals of two input termination electric mains of Industrial Frequency Transformer B, the output terminal of Industrial Frequency Transformer B is connected with the input end of full bridge rectifier D, another output terminal of Industrial Frequency Transformer B is connected with another input end of full bridge rectifier D, the output terminal of full bridge rectifier D links to each other with an end of resistance R 1, the other end of resistance R 1 links to each other with the input end of light emitting diode among photoelectrical coupler OC1, another output terminal of full bridge rectifier D links to each other with the output terminal of light emitting diode among photoelectrical coupler OC1, among photoelectrical coupler OC1 the collector of phototriode respectively with the counting control input end of digital micro-control circuit 2, one end of resistance R 2 connects, the other end of resistance R 2 links to each other with the voltage output end of power-supplying circuit 1, the grounded emitter of phototriode among photoelectrical coupler OC1, the base stage of phototriode is unsettled, the temperature control output end of temperature sensing circuit 3 links to each other with the temperature detection input end of digital micro-control circuit 2, the fail-safe control output terminal of temperature sensing circuit 3 links to each other with the fault detect input end of digital micro-control circuit 2, and the power control output end of digital micro-control circuit 2 links to each other with the power control input end of power control circuit 4.
Its job step is as follows:
1) power-supplying circuit 1 is transformed to the Constant Direct Current power supply with electric main, is the chip power supply of each functional circuit;
2) utilize temperature sensing circuit 3, realize the conversion of temperature signal to analog electrical signal, the A/D change-over circuit by digital micro-control circuit 2 inside is converted to digital signal for digital micro-control circuit 2 processing with analog electrical signal again;
3) utilize digital micro-control circuit 2 temperature inside control program algorithm computation to go out the output power regulated quantity;
4) according to the power adjustments amount of digital micro-control circuit 2 outputs, power control circuit 4 flows through the alternating current half cycle cycle of well heater by control, realizes the adjusting to heating power.
The present invention is on the basis of existing temperature-control circuit, design has half cycle cycle counting circuit 2, it utilizes Industrial Frequency Transformer B with the electric main step-down, and obtain the pulsating direct current that frequency is 2 times of mains frequencies by full bridge rectifier D, the resistance R 1 that metering function has been passed through in described pulsating direct current output links to each other with the input end of a photoelectrical coupler OC1, the output terminal of a photoelectrical coupler OC1 connects direct supply by the resistance R 2 of drawing effect on plaing, and links to each other with the counter input end of digital micro-control circuit 2 simultaneously.When required power was exported, digital micro-control circuit 2 enabled the bidirectional triode thyristor trigger circuit, and unison counter to the rising edge counting, when count value reaches setting value, is closed bidirectional triode thyristor after first negative edge appears in input.Therefore, the minimal adjustment step-length of output power is the output power of the semiperiod correspondence of electric main.Because not triggered, counting process do not enable constantly the influence of electric main cycle relative position and ac frequency fluctuation relatively, the inaccurate problem of actual conducting half cycle number that bidirectional triode thyristor brings when therefore having avoided using output ON time control mode.
Resistance R 1 and resistance R 2 are precision resisters, and resistance error is less than 1 ‰ of its standard value, and the model of a photoelectrical coupler OC1 is TLP521.
Described power-supplying circuit 1 carries out step-down with the electric main of 220V by Industrial Frequency Transformer B, civil power after the step-down is adjusted into pulsating direct current by full bridge rectifier, pulsating direct current after the rectification is transformed to the direct current of required voltage by the three terminal regulator circuit with it, is the power supply of circuit chips.
The three terminal regulator circuit adopts 7815 and 7915 three terminal regulators symmetry ways of connecting to generate one group of symmetry constant dc voltage source+VCC1 and reaches-VCC1, its magnitude of voltage is respectively+15V and-15V, adopt one 7805 to generate a constant dc voltage source VCC, its magnitude of voltage is+5V.
Embodiment two: the difference of present embodiment and embodiment one is: it is PIC16F series monolithic chip that the acp chip of the microcontroller of described digital micro-control circuit 2 adopts model.
When having the A/D change-over circuit in the singlechip chip that is adopted, other chips need not be added, when not being with in the single-chip microcomputer sheet that adopts that A/D change-over circuit figure place is not enough in A/D change-over circuit or the sheet, the A/D conversion chip need be added.
Embodiment three: specify present embodiment below in conjunction with Fig. 2.The difference of present embodiment and embodiment one is: described temperature sensing circuit 3 is made up of voltage place in circuit, resistance bridge circuit and signal amplification circuit,
Described voltage place in circuit is made up of resistance R 3, potentiometer R4 and operational amplifier U1A, the voltage output end of one termination power feed circuit 1 of resistance R 3, the stiff end of the other end of resistance R 3, potentiometer R4 is connected with the positive input of operational amplifier U1A respectively, the sliding end end ground connection of potentiometer R4, the reverse input end of operational amplifier U1A is connected with the output terminal of operational amplifier U1A
Described resistance bridge circuit is by resistance R b1, resistance R b2, resistance R b3 and thermistor Rt form, the end of resistance R b1, the end of resistance R b2 is connected with the output terminal of operational amplifier U1A respectively, the other end of resistance R b1 is connected with the end of thermistor Rt, the other end of resistance R b2 is connected with the end of resistance R b3, the other end of thermistor Rt is connected with the other end of resistance R b3 and ground connection, thermistor Rt is connected with the fault detect input end of digital micro-control circuit 2 with the tie point of resistance R b3
Described signal amplification circuit is by potentiometer R
G, resistance R 5, capacitor C and instrument form with operational amplifier U2A, resistance R b1 is connected with the positive input of instrument with operational amplifier U2A with the tie point of thermistor Rt, resistance R b3 is connected potentiometer R with the tie point of resistance R b2 with the reverse input end of instrument with operational amplifier U2A
GA stiff end be connected potentiometer R with the postiive gain modulated terminal of instrument with operational amplifier U2A
GSliding end be connected with the negative gain modulation end of instrument with operational amplifier U2A, instrument is connected with an end of resistance R 5 with operational amplifier U2A output terminal, the other end of resistance R 5 is connected with the temperature detection input end of digital micro-control circuit 2, an end of capacitor C respectively, and the other end of capacitor C is connected with the reference edge of No. two operational amplification circuit U2A and ground connection.
Adopt operational amplifier U1A as voltage follower in the described voltage place in circuit, play buffering, strengthen power supply capacity simultaneously for the back level.The model of operational amplifier U1A is μ 741, and resistance R 4 is precision resisters, and resistance error is less than 1 ‰ of its standard value.
For simplifying circuit design and keeping the higher detection precision, described signal amplification circuit China National Instruments Import ﹠ Export Corporation adopts integrated instrument to realize with amplifier AD620 with operational amplifier U2A, and the output signal after signal amplification circuit amplifies inserts the temperature detection signal input end of digital micro-control circuit 2 through the filtering circuit of resistance R 5 and capacitor C formation.
Thermistor Rt is applied in the temperature sensing circuit widely as a kind of of temperature sensor, in conventional bridge connection, owing to the open circuit amplifier output that makes the back big pressure reduction of level amplifying circuit input cause of sensor is saturated and exceed the temperature detection input voltage limit of test control circuit.
For addressing this problem, designed the described temperature sensing circuit 3 of present embodiment, whether diagnostic circuit exists that unusual condition adopts is that the thermistor Rt of resistance bridge and the tie point of resistance R b3 and the fault detect input end ways of connecting of digital micro-control circuit 2 are realized, also can adopt the tie point of resistance R b1 and thermistor Rt or the tie point of resistance R b2 and resistance R b3, realize with the fault detect input end ways of connecting of digital micro-control circuit 2, whether numeral micro-control circuit 2 can be judged thermistor Rt and occur connecting unusual by the variation of sample amplitude when reproduced before and after relatively temperature-sensitive resistance R t disconnects.
Use the described circuit of present embodiment, can realize that protection to laggard amplifying circuit has also realized the detection to thermistor Rt connection status simultaneously.
Embodiment four: specify present embodiment below in conjunction with Fig. 3.The difference of present embodiment and embodiment one is: described power control circuit 4 has resistance R 6, resistance R 7, resistance R 8, heater H, bidirectional triode thyristor Q and No. two photoelectrical coupler OC2 form, the power control output end of numeral micro-control circuit 2 links to each other with an end of resistance R 8, the other end of resistance R 8 is connected with the input end of light emitting diode among No. two photoelectrical coupler OC2, the output head grounding of light emitting diode among No. two photoelectrical coupler OC2, the first anode of the bidirectional triode thyristor among No. two photoelectrical coupler OC2 links to each other with an end of resistance R 6, the other end of resistance R 6 links to each other with the first anode of bidirectional triode thyristor Q, the second anode of the bidirectional triode thyristor among No. two photoelectrical coupler OC2 extremely links to each other with an end of resistance R 7 and the control of bidirectional triode thyristor Q respectively, the other end of resistance R 7 links to each other the other end of heater H with the second anode of bidirectional triode thyristor Q and an end of heater H respectively, resistance R 6 is connected with two output terminals of electric main respectively with the tie point of bidirectional triode thyristor Q.
Numeral micro-control circuit 2 is by the detected temperature data of temperature control program algorithm process, and then obtain exporting the regulated quantity of heating power, power control circuit 4 according to described heating power regulated quantity, utilize electric main to power for heater H, by control zero cross fired bidirectional triode thyristor Q control heating power, the minimal adjustment step-length of output power is the output power of the semiperiod correspondence of electric main.
The model of No. two photo-coupler OC2 is MOC3041.
Embodiment five: specify present embodiment below in conjunction with Fig. 4.The difference of present embodiment and embodiment one is: digital temperature control circuit also comprises auxiliary functional circuit 6, power-supplying circuit 1 voltage output end links to each other with the voltage input end of auxiliary functional circuit 6, the subsidiary function control input/output terminal of numeral micro-control circuit 2 links to each other with the control input/output terminal of auxiliary functional circuit 6 respectively, and described auxiliary functional circuit 6 is made up of button inputting circuits, charactron display circuit and warning circuit.
Described button inputting circuits realizes that by the mechanical type button end of mechanical type button links to each other with the input pin of digital micro-control circuit 2, the other end ground connection of mechanical type button.
Described charactron display circuit is by charactron, I
2The charactron control chip of C interface realizes that the charactron signal input end links to each other with the control signal output ends of charactron control chip, charactron control chip I
2C interface links to each other with digital micro-control circuit 2 by pull-up resistor.
Described warning circuit realizes that by triode, hummer transistor base links to each other with digital micro-control circuit 2 output pins by resistance, and collector links to each other with hummer and current-limiting resistance one end, and the current-limiting resistance other end links to each other with dc power supply.
When digital micro-control circuit 2 detected thermistor Rt and do not connect or occur measuring temperature and exceed abnormal conditions such as range of set value, the hummer in the digital micro-control circuit 2 control warning circuits sent alarm sound; Numeral micro-control circuit 2 control charactron display circuits, data such as displays temperature value and failure message.
Claims (5)
1. digital temperature control circuit, it comprises power-supplying circuit (1), numeral micro-control circuit (2), temperature sensing circuit (3) and power control circuit (4), it is characterized in that: further comprising half cycle cycle counting circuit (5), the voltage output end of power-supplying circuit (1) links to each other with the voltage input end of digital micro-control circuit (2) with temperature sensing circuit (3) respectively, half cycle cycle counting circuit (5) is by Industrial Frequency Transformer (B), full bridge rectifier (D), resistance R 1, a resistance R 2 and a photoelectrical coupler (OC1) are formed, two output terminals of two input termination electric mains of Industrial Frequency Transformer (B), an output terminal of Industrial Frequency Transformer (B) is connected with an input end of full bridge rectifier (D), another output terminal of Industrial Frequency Transformer (B) is connected with another input end of full bridge rectifier (D), an output terminal of full bridge rectifier (D) links to each other with an end of resistance R 1, the other end of resistance R 1 links to each other with the input end of light emitting diode in the photoelectrical coupler (OC1), another output terminal of full bridge rectifier (D) links to each other with the output terminal of light emitting diode in the photoelectrical coupler (OC1), in the photoelectrical coupler (OC1) collector of phototriode respectively with the counting control input end of digital micro-control circuit (2), one end of resistance R 2 connects, the other end of resistance R 2 links to each other with the voltage output end of power-supplying circuit (1), the grounded emitter of phototriode in the photoelectrical coupler (OC1), the base stage of phototriode is unsettled, the temperature control output end of temperature sensing circuit (3) links to each other with the temperature detection input end of digital micro-control circuit (2), the fail-safe control output terminal of temperature sensing circuit (3) links to each other with the fault detect input end of digital micro-control circuit (2), and the power control output end of digital micro-control circuit (2) links to each other with the power control input end of power control circuit (4).
2. digital temperature control circuit according to claim 1 is characterized in that: it is PIC16F series monolithic chip that the acp chip of the microcontroller of described digital micro-control circuit (2) adopts model.
3. digital temperature control circuit according to claim 1 is characterized in that: described temperature sensing circuit (3) is made up of voltage place in circuit, resistance bridge circuit and signal amplification circuit,
Described voltage place in circuit is made up of resistance R 3, potentiometer R4 and operational amplifier (U1A), the voltage output end of one termination power feed circuit (1) of resistance R 3, the stiff end of the other end of resistance R 3, potentiometer R4 is connected with the positive input of operational amplifier (U1A) respectively, the sliding end end ground connection of potentiometer R4, the reverse input end of operational amplifier (U1A) is connected with the output terminal of operational amplifier (U1A)
Described resistance bridge circuit is by resistance R b1, resistance R b2, resistance R b3 and thermistor Rt form, the end of resistance R b1, the end of resistance R b2 is connected with the output terminal of operational amplifier (U1A) respectively, the other end of resistance R b1 is connected with the end of thermistor Rt, the other end of resistance R b2 is connected with the end of resistance R b3, the other end of thermistor Rt is connected with the other end of resistance R b3 and ground connection, thermistor Rt is connected with the fault detect input end of digital micro-control circuit (2) with the tie point of resistance R b3
Described signal amplification circuit is by potentiometer R
G, resistance R 5, capacitor C and instrument form with operational amplifier (U2A), resistance R b1 is connected with the positive input of instrument with operational amplifier (U2A) with the tie point of thermistor Rt, resistance R b3 is connected potentiometer R with the tie point of resistance R b2 with the reverse input end of instrument with operational amplifier (U2A)
GA stiff end be connected potentiometer R with the postiive gain modulated terminal of instrument with operational amplifier (U2A)
GSliding end be connected with the negative gain modulation end of instrument with operational amplifier (U2A), instrument is connected with an end of resistance R 5 with operational amplifier (U2A) output terminal, the other end of resistance R 5 is connected with the temperature detection input end of digital micro-control circuit (2), an end of capacitor C respectively, and the other end of capacitor C is connected with the reference edge of No. two operational amplification circuits (U2A) and ground connection.
4. digital temperature control circuit according to claim 1, it is characterized in that: described power control circuit (4) is by resistance R 6, resistance R 7, resistance R 8, well heater (H), bidirectional triode thyristor (Q) and No. two photoelectrical couplers (OC2) are formed, the power control output end of numeral micro-control circuit (2) links to each other with an end of resistance R 8, the other end of resistance R 8 is connected with the input end of light emitting diode in No. two photoelectrical couplers (OC2), the output head grounding of light emitting diode in No. two photoelectrical couplers (OC2), the first anode of the bidirectional triode thyristor in No. two photoelectrical couplers (OC2) links to each other with an end of resistance R 6, the other end of resistance R 6 links to each other with the first anode of bidirectional triode thyristor (Q), the second anode of the bidirectional triode thyristor in No. two photoelectrical couplers (OC2) extremely links to each other with an end of resistance R 7 and the control of bidirectional triode thyristor (Q) respectively, the other end of resistance R 7 links to each other the other end of well heater (H) with the second anode of bidirectional triode thyristor (Q) and an end of well heater (H) respectively, resistance R 6 is connected with two output terminals of electric main respectively with the tie point of bidirectional triode thyristor (Q).
5. digital temperature control circuit according to claim 1, it is characterized in that: further comprising auxiliary functional circuit (6), power-supplying circuit (1) voltage output end links to each other with the voltage input end of auxiliary functional circuit (6), the subsidiary function control input/output terminal of numeral micro-control circuit (2) links to each other with the control input/output terminal of auxiliary functional circuit (6) respectively, and described auxiliary functional circuit (6) is made up of button inputting circuits, charactron display circuit and warning circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101094008A CN101788830B (en) | 2010-02-11 | 2010-02-11 | Digital temperature control circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101094008A CN101788830B (en) | 2010-02-11 | 2010-02-11 | Digital temperature control circuit |
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| CN101788830A true CN101788830A (en) | 2010-07-28 |
| CN101788830B CN101788830B (en) | 2012-02-29 |
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| CN2010101094008A Expired - Fee Related CN101788830B (en) | 2010-02-11 | 2010-02-11 | Digital temperature control circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103823488A (en) * | 2014-03-16 | 2014-05-28 | 王志 | Temperature adjuster of heat preservation panel of dining table |
| CN103920404A (en) * | 2014-04-15 | 2014-07-16 | 苏州润弘贸易有限公司 | Printing and dyeing auxiliary stirrer |
| CN105242535A (en) * | 2015-09-13 | 2016-01-13 | 常州大学 | Adaptive control system for microwave food drying |
| CN107424580A (en) * | 2017-08-17 | 2017-12-01 | 山东蓝贝易书信息科技有限公司 | A kind of no material consumption luminous energy liquid crystal writing plate part wiping arrangement |
| CN107713759A (en) * | 2017-11-20 | 2018-02-23 | 厦门芯阳科技股份有限公司 | A kind of coffee machine temperature control processing method |
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| JPH11194836A (en) * | 1997-12-26 | 1999-07-21 | Canon Inc | Electric conduction control means, fixing device, and image forming device equipped with them |
| US6259073B1 (en) * | 1998-07-07 | 2001-07-10 | Brother Kogyo Kabushiki Kaisha | Temperature control device for controlling temperature of heat roller used in image forming device |
| CN201066457Y (en) * | 2007-06-13 | 2008-05-28 | 曾曙辉 | Temperature controller |
| CN201383109Y (en) * | 2009-03-23 | 2010-01-13 | 张琳曼 | Electric-mattress thermostatic apparatus |
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| US4948044A (en) * | 1989-08-21 | 1990-08-14 | Harper-Wyman Company | Electronic digital thermostat having an improved power supply |
| JPH11194836A (en) * | 1997-12-26 | 1999-07-21 | Canon Inc | Electric conduction control means, fixing device, and image forming device equipped with them |
| US6259073B1 (en) * | 1998-07-07 | 2001-07-10 | Brother Kogyo Kabushiki Kaisha | Temperature control device for controlling temperature of heat roller used in image forming device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103823488A (en) * | 2014-03-16 | 2014-05-28 | 王志 | Temperature adjuster of heat preservation panel of dining table |
| CN103920404A (en) * | 2014-04-15 | 2014-07-16 | 苏州润弘贸易有限公司 | Printing and dyeing auxiliary stirrer |
| CN105242535A (en) * | 2015-09-13 | 2016-01-13 | 常州大学 | Adaptive control system for microwave food drying |
| CN107424580A (en) * | 2017-08-17 | 2017-12-01 | 山东蓝贝易书信息科技有限公司 | A kind of no material consumption luminous energy liquid crystal writing plate part wiping arrangement |
| CN107713759A (en) * | 2017-11-20 | 2018-02-23 | 厦门芯阳科技股份有限公司 | A kind of coffee machine temperature control processing method |
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| CN101788830B (en) | 2012-02-29 |
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