CN201751883U - Heating element temperature control circuit and heating device - Google Patents
Heating element temperature control circuit and heating device Download PDFInfo
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- CN201751883U CN201751883U CN2010202584103U CN201020258410U CN201751883U CN 201751883 U CN201751883 U CN 201751883U CN 2010202584103 U CN2010202584103 U CN 2010202584103U CN 201020258410 U CN201020258410 U CN 201020258410U CN 201751883 U CN201751883 U CN 201751883U
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Abstract
The utility model discloses a heating element temperature control circuit which is connected to an alternating current power supply and comprises a zero-crossing signal generating circuit used for generating zero-crossing pulse signals, and a temperature control circuit outputting control signals to the heating circuit according to the resistance of the heating element, wherein the zero-crossing signal generating circuit is connected with the temperature control circuit and inputs the generated zero-crossing pulse signals to the temperature control circuit; the normal-phase input end of a comparer is connected with the output end of the zero-crossing signal generating circuit, and the inverted input end is connected with the control end of a silicon controlled and the heating element respectively through a diode. The heating element temperature control circuit controls the temperature of the heating element by using a pure hardware circuit, and has the advantages of simple structure, accurate and reliable control, low production cost and the like.
Description
Technical field
The utility model relates to the electron and electrician technical field, particularly a kind of heater temperature-control circuit and electro-heat equipment.
Background technology
The resistance-type electro-heat equipment generally includes heater and control circuit, control circuit comprises temperature sensor again, temperature in order to the induction heater, and the temperature sensed wheel is changed to electric signal, after amplifying, offer signal processor or temperature-control circuit, be control signal with this electrical signal conversion then, and then reach the purpose of control heater temperature.
Because the ordinary temp transducer sensitivity is lower, and be subject to the influence of the interference of environment and pre-amplification circuit and the occurrence temperature drift, therefore the temperature of the actual heater that records is inaccurate.And accurate temperature sensor costs an arm and a leg, and anti-interference is poor, is not suitable for use in the temperature sensor of electro-heat equipment, in order to avoid increase too much cost.
The utility model content
Fundamental purpose of the present utility model is to provide a kind of heater temperature-control circuit and electro-heat equipment, to solve temperature drift and to measure inaccurate problem.
The utility model provides a kind of heater temperature-control circuit, is connected in AC power, comprising:
Zero cross signal generation circuit produces the zero-crossing pulse signal;
Temperature-control circuit, according to the resistance output control signal of heater, and
The heating circuit, described zero cross signal generation circuit is connected with temperature-control circuit, and the zero-crossing pulse signal that produces is exported to temperature-control circuit; Described temperature-control circuit comprises a comparer, and described heating circuit comprises a controllable silicon, and this controllable silicon input end is connected with an AC power, and the other end is connected with described heater; The normal phase input end of described comparer is connected with the output terminal of zero cross signal generation circuit, and inverting input is connected with described silicon controlled control end and heater respectively by a diode.
Preferably, described zero cross signal generation circuit comprises first triode, second triode, the 3rd triode and the 4th triode, the base stage of described the 4th triode is connected with the zero line of AC power, emitter is connected with the base stage of the 3rd triode, and collector is connected with the collector of the 3rd triode and the base stage of first triode respectively; The base stage of described the 3rd triode is connected with the phase line of described AC power, grounded emitter, and collector is connected with the phase line of described AC power by a diode; The grounded emitter of described first triode, collector is connected with the base stage of second triode; The collector of described second triode is connected with the collector of the 3rd triode, and emitter is connected with described temperature-control circuit and exports the zero-crossing pulse signal.
Preferably, the normal phase input end of described comparer is by a variable resistor ground connection, and to regulate the reference voltage of this normal phase input end, inverting input is by first resistance eutral grounding, and output terminal is by a switch ground connection.
Preferably, the inverting input of described comparer is connected with the output terminal of described zero cross signal generation circuit by another diode.
Preferably, described zero cross signal generation circuit also is provided with filtering circuit, and the input end of this filtering circuit is connected with described AC power, and output terminal is connected with the collector of described second triode.
Preferably, described zero cross signal generation circuit also is parallel with a mu balanced circuit, and this mu balanced circuit comprises voltage stabilizing diode.
Preferably, the resistance of described heater and temperature are linear.
Preferably, described heater is a ceramic heating element.
The utility model also provides a kind of electro-heat equipment, comprises heater, and the resistance and the temperature of described heater are linear, also comprise the heater temperature-control circuit, and described heater temperature-control circuit further comprises:
Zero cross signal generation circuit is to produce the zero-crossing pulse signal; Temperature-control circuit, according to the resistance output control signal of heater, and the heating circuit, described zero cross signal generation circuit is connected with temperature-control circuit, and the zero-crossing pulse signal that produces is exported to temperature-control circuit; Described temperature-control circuit comprises a comparer, and described heating circuit comprises a controllable silicon, and this controllable silicon input end is connected with an AC power, and the other end is connected with described heater; The normal phase input end of described comparer is connected with the output terminal of zero cross signal generation circuit, and inverting input is connected with described silicon controlled control end and heater respectively by a diode.
Adopt heater temperature-control circuit of the present utility model, can realize not having the devices at full hardware control circuit of software, only comprise several triodes, diode and a controllable silicon and a comparer in all circuit, utilize the resistance and the linear characteristic of temperature of heater, promptly obtain the humidity index of heater according to the resistance of heater.In addition, the utility model does not have the interference of current and voltage signals, so measurement result is comparatively accurate owing to be the resistance of measuring heater when no-voltage.Thereby it has simple in structure, temperature precise control and advantage such as with low cost.
Description of drawings
Fig. 1 is a heater temperature-control circuit block scheme among the embodiment of the present utility model;
Fig. 2 is the structural representation of heater temperature-control circuit among the embodiment of the present utility model;
Fig. 3 is the oscillogram of zero cross signal among the embodiment of the present utility model.
The realization of the utility model purpose, functional characteristics and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Fig. 1 is a heater temperature-control circuit block scheme among the embodiment of the present utility model.
With reference to Fig. 1, the heater temperature-control circuit of present embodiment comprises zero cross signal generation circuit 1, temperature-control circuit 2 and heating circuit 3, and zero cross signal generation circuit 1 is connected with AC power, is used to produce the zero-crossing pulse signal; Temperature-control circuit 2 is connected with zero cross signal generation circuit 1, receives and handle the zero-crossing pulse signal; Heating circuit 3 is connected with AC power, comprises controllable silicon and heater, and the silicon controlled input end is connected with AC power, and output terminal is connected with heater, and control end is connected with temperature-control circuit 2, is controlled the silicon controlled conductings or is ended by temperature-control circuit 2.
The temperature that temperature-control circuit adopts pure hardware mode control heater is stopped in the heating of present embodiment, has avoided the employing temperature sensor, thereby has improved the accuracy of control, has simplified circuit structure, has reduced production cost.
Fig. 2 is the structural representation of heater temperature-control circuit among the embodiment of the present utility model;
Fig. 3 is the oscillogram of middle zero cross signal embodiment illustrated in fig. 2.
With reference to Fig. 2, zero cross signal generation circuit comprises the first triode TR1, the second triode TR2, the 3rd triode TR3 and the 4th triode TR4, the base stage of TR4 is connected with the zero line of AC power, and emitter is connected with the base stage of TR3, and collector is connected with the collector of TR3 and the base stage of TR1 respectively; The base stage of TR3 is connected with the phase line of AC power, grounded emitter, and collector is connected with the phase line of AC power by diode D2; The base stage of a TR1 capacitor C 1 in parallel, grounded emitter, collector is connected with the base stage of TR2; The collector of TR2 is connected with the collector of TR3, and emitter is connected with temperature-control circuit and exports zero cross signal.
In conjunction with Fig. 3, the principle of above-mentioned zero cross signal generation circuit is:
In the voltage positive half period, electric current is loaded into the base stage of TR3 through resistance R 2, TR3 conducting this moment, because the collector of TR3 is connected with the base stage of TR1, so the base stage of TR1 is in electronegative potential, and TR1 ends, thereby TR2 ends, zero cross signal generation circuit no-output voltage.
In semiperiod, the base stage of TR4 is a high level in voltage negative, the TR4 conducting because the base stage of TR1 is connected with the emitter of TR4, thus TR1 end, thereby TR2 ends.
When voltage is in passing zero moment, TR3, TR4 all end, capacitor C 1 discharge this moment, and the base stage of TR1 is in high level, TR1 conducting, thereby TR2 conducting, zero cross signal generation circuit output zero-crossing pulse signal signal1 (see figure 2).
Be just zero cross signal steady operation, present embodiment is set up mu balanced circuit so that provide stable operating voltage for it before zero cross signal.This mu balanced circuit comprises voltage stabilizing diode Z1 and a diode D1 in parallel with AC power.Capacitor C 1 and resistance R 1 also can be formed a filtering circuit, make the pulse width of zero-crossing pulse signal signal1 constant, are convenient to the accurate processing of follow-up signal.
Temperature-control circuit is connected with the emitter of TR2 in the zero cross signal generation circuit, receives the zero-crossing pulse signal of TR2 output.
Refer again to Fig. 3, temperature-control circuit comprises a comparer U1, and this comparer U1 is a voltage comparator, and its normal phase input end 5 is connected with the emitter of TR2, and by potentiometer VR1 and R13 ground connection; 6 of inverting inputs are connected with the emitter of TR2 by a diode D3, and pass through resistance R 10 ground connection, and are connected with heater HEATER by a diode D4 between the emitter of diode D3 and TR2; The output terminal 7 of comparer U1 is connected with the control end of controllable silicon SCR 1.The heating circuit comprises controllable silicon SCR 1 and heater HEATER, and the input end of SCR1 is connected with AC power, and output terminal is connected with heater HEATER, and control end is connected with AC power by diode D6.
The principle of said temperature control circuit and heating circuit is:
The normal phase input end 5 of comparer U1 is connected with the output terminal of zero cross signal generation circuit, and by VR1 and R13 ground connection, when regulating the resistance of VR1, the potential value of the normal phase input end 5 of scalable comparer U1.Inverting input 6 passes through R6, R10 and heater HEATER dividing potential drop, and is connected to the output terminal of zero cross signal generation circuit by diode D6.When not the HEATER temperature was low when generating heat, its resistance was less, makes the voltage of inverting input 6 lower by D4, and this moment, comparer U1 exported the control end of high level to controllable silicon SCR 1,1 conducting of triggering controllable silicon SCR, the heating of heater HEATER energized; When heater HEATER is heated to higher temperature, because its resistance and temperature are linear, thereby its resistance increases, and the voltage of inverting input 6 is raise, when surpassing the reference voltage that VR1 and R13 set, comparer U1 output low level is to the control end of controllable silicon SCR 1, trigger controllable silicon SCR 1 and end, heater HEATER then stops heating ... so repeatedly, heater HEATER temperature is remained within certain scope, thereby reach the purpose of control temperature.
The comparer of present embodiment is only constantly just worked at voltage zero-cross, controllable silicon SCR 1 is the remain off state when supply voltage is in negative half-cycle, by above analysis, heater HEATER only works in supply voltage is in positive half period, therefore, comparer U1 detects the temperature of a heater HEATER in each cycle, its trigger pip signal2 (see figure 2) is interrupted pulse signal (as shown in Figure 3).
The effect of above-mentioned diode D4 is, controllable silicon SCR 1 by the time can play the effect that dividing potential drop detects, and when controllable silicon SCR 1 conducting, then play a part insulation blocking, the inverting input 6 that stops AC supply voltage to be loaded into comparer U1 causes the control failure.In actual application, diode D3 also can play and eliminate the temperature drift phenomenon that comparer U1 produces, and then improves the accuracy and the reliability of control.
The output terminal 7 of comparer U1 is also by a switch SW 1 ground connection, when switch SW 1 disconnected, no matter output terminal 7 exported high level or low level, and the control end of controllable silicon SCR 1 is low level, be cut-off state, thereby heater HEATER and AC power remain disconnection.
In addition, electro-heat equipment of the present utility model comprises above-described heater temperature-control circuit, its heater adopts the linear material of resistance/temperature to make, as ceramic heating element etc., thereby easier control, the temperature-control circuit of the present utility model of employing also can be controlled the temperature of heater exactly.
In sum, heater temperature-control circuit of the present utility model and electro-heat equipment are formed because of only adopting elements such as diode, triode, comparer and controllable silicon, need not to carry out complicated signals collecting and processing, also need not to adopt expensive chip and temperature sensor, thereby have advantages such as simple in structure, the reliable and low production cost of precise control.
The above only is a preferred embodiment of the present utility model; be not so limit its claim; every equivalent structure transformation that utilizes the utility model instructions and accompanying drawing content to be done; directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (10)
1. a heater temperature-control circuit is connected in AC power, it is characterized in that, comprising:
Zero cross signal generation circuit produces the zero-crossing pulse signal;
Temperature-control circuit, according to the resistance output control signal of heater, and
The heating circuit, described zero cross signal generation circuit is connected with temperature-control circuit, and the zero-crossing pulse signal that produces is exported to temperature-control circuit; Described temperature-control circuit comprises a comparer, and described heating circuit comprises a controllable silicon, and this controllable silicon input end is connected with an AC power, and the other end is connected with described heater; The normal phase input end of described comparer is connected with the output terminal of zero cross signal generation circuit, and inverting input is connected with described silicon controlled control end and heater respectively by a diode.
2. heater temperature-control circuit as claimed in claim 1, it is characterized in that, described zero cross signal generation circuit comprises first triode, second triode, the 3rd triode and the 4th triode, the base stage of described the 4th triode is connected with the zero line of AC power, emitter is connected with the base stage of the 3rd triode, and collector is connected with the collector of the 3rd triode and the base stage of first triode respectively; The base stage of described the 3rd triode is connected with the phase line of described AC power, grounded emitter, and collector is connected with the phase line of described AC power by a diode; The grounded emitter of described first triode, collector is connected with the base stage of second triode; The collector of described second triode is connected with the collector of the 3rd triode, and emitter is connected with described temperature-control circuit and exports the zero-crossing pulse signal.
3. heater temperature-control circuit as claimed in claim 1, it is characterized in that the normal phase input end of described comparer is by a variable resistor ground connection, to regulate the reference voltage of this normal phase input end, inverting input is by first resistance eutral grounding, and output terminal is by a switch ground connection.
4. heater temperature-control circuit as claimed in claim 1 is characterized in that, the inverting input of described comparer is connected with the output terminal of described zero cross signal generation circuit by another diode.
5. heater temperature-control circuit as claimed in claim 2 is characterized in that, described zero cross signal generation circuit also is provided with filtering circuit, and the input end of this filtering circuit is connected with described AC power, and output terminal is connected with the collector of described second triode.
6. heater temperature-control circuit as claimed in claim 1 is characterized in that, described zero cross signal generation circuit also is parallel with a mu balanced circuit, and this mu balanced circuit comprises voltage stabilizing diode.
7. as each described heater temperature-control circuit in the claim 1, it is characterized in that the resistance and the temperature of described heater are linear.
8. heater temperature-control circuit as claimed in claim 7 is characterized in that, described heater is a ceramic heating element.
9. an electro-heat equipment comprises heater, and the resistance and the temperature of described heater are linear, it is characterized in that, also comprise the heater temperature-control circuit, and described heater temperature-control circuit further comprises:
Zero cross signal generation circuit is to produce the zero-crossing pulse signal;
Temperature-control circuit, according to the resistance output control signal of heater, and the heating circuit, described zero cross signal generation circuit is connected with temperature-control circuit, and the zero-crossing pulse signal that produces is exported to temperature-control circuit; Described temperature-control circuit comprises a comparer, and described heating circuit comprises a controllable silicon, and this controllable silicon input end is connected with an AC power, and the other end is connected with described heater; The normal phase input end of described comparer is connected with the output terminal of zero cross signal generation circuit, and inverting input is connected with described silicon controlled control end and heater respectively by a diode.
10. electro-heat equipment as claimed in claim 9 is characterized in that, described heater temperature-control circuit is the heater temperature-control circuit described in each in the right 2 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202584103U CN201751883U (en) | 2010-07-13 | 2010-07-13 | Heating element temperature control circuit and heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202584103U CN201751883U (en) | 2010-07-13 | 2010-07-13 | Heating element temperature control circuit and heating device |
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| Publication Number | Publication Date |
|---|---|
| CN201751883U true CN201751883U (en) | 2011-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202584103U Expired - Fee Related CN201751883U (en) | 2010-07-13 | 2010-07-13 | Heating element temperature control circuit and heating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201751883U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699471A (en) * | 2012-06-07 | 2012-10-03 | 康奋威科技（杭州）有限公司 | Linear-proportional-control-based cell welding circuit and heating method thereof |
| CN104661345A (en) * | 2013-11-22 | 2015-05-27 | 张隆皇 | Heating line control device |
| CN107562088A (en) * | 2017-09-20 | 2018-01-09 | 惠州市日进科技有限公司 | The temperature controller and temprature control method of a kind of resistance measurement |
-
2010
- 2010-07-13 CN CN2010202584103U patent/CN201751883U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699471A (en) * | 2012-06-07 | 2012-10-03 | 康奋威科技（杭州）有限公司 | Linear-proportional-control-based cell welding circuit and heating method thereof |
| CN104661345A (en) * | 2013-11-22 | 2015-05-27 | 张隆皇 | Heating line control device |
| CN104661345B (en) * | 2013-11-22 | 2016-03-30 | 张隆皇 | Line with heating function control device |
| CN107562088A (en) * | 2017-09-20 | 2018-01-09 | 惠州市日进科技有限公司 | The temperature controller and temprature control method of a kind of resistance measurement |
| CN107562088B (en) * | 2017-09-20 | 2023-06-13 | 惠州市日进科技有限公司 | Temperature controller for resistance measurement and temperature control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110223 Termination date: 20180713 |