CN104349517A - Heating control circuit - Google Patents
Heating control circuit Download PDFInfo
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- CN104349517A CN104349517A CN201310316855.0A CN201310316855A CN104349517A CN 104349517 A CN104349517 A CN 104349517A CN 201310316855 A CN201310316855 A CN 201310316855A CN 104349517 A CN104349517 A CN 104349517A
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- control circuit
- circuit
- power supply
- temperature detection
- voltage
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Abstract
The invention relates to a heating control circuit. The heating control circuit comprises a voltage reducing circuit, a power supply circuit, a temperature detection control circuit and a switch tube, wherein the voltage reducing circuit is connected with the power supply circuit, the power supply circuit is connected with the temperature detection control circuit, and the temperature detection control circuit is connected with the switch tube. The heating control circuit has a simple structure and high automation degree and can realize service life prolongation.
Description
Technical field
The present invention relates to a kind of heating control circuit.
Background technology
At present, the heating electrical appliances such as dryer, water heater, electric oven are generally realize heating function by carrying out electric heating to heater strip.The control circuit of existing heating electrical appliance, normally utilizes the action of relay to carry out heating process control.Simple employing relay carries out the control of heating power, easily causes heating process uneven.Due to heater circuit heating with full power during relay adhesive, heat is large; But relay does not heat again when disconnecting completely.Except heating with full power, uniform heating process cannot be obtained at all.If heating electrical appliance needs to change heating power, the method usually adopted coordinates heating by two heater strips, or completed the adjustment of heating power by the interruption action of relay.If by relay frequently fast break-make realize basic uniform heating, but due to actuating of relay number of times limited, so relay can damage very soon.Meanwhile, the interruption action due to relay runs in charged situation, and relay contact there will be spark phenomenon.The ablation of relay contact can be caused like this, cause the damage that relay is very fast.
Summary of the invention
For above-mentioned technical problem, main purpose of the present invention is, provides a kind of structure simple and automaticity is high and the heating control circuit of long service life.
The technical scheme solved the problems of the technologies described above is as follows:
Heating control circuit, comprise reduction voltage circuit, power supply circuits, temperature detection control circuit and switching tube, reduction voltage circuit is connected with power supply circuits, and power supply circuits are connected with temperature detection control circuit, and temperature detection control circuit is connected with switching tube.
Described reduction voltage circuit is made up of the first resistance and the first electric capacity, and the two ends of the first resistance are connected with the two ends of the first electric capacity respectively.
Described power supply circuits are made up of the first diode, the second electric capacity and voltage stabilizing didoe, and the first diode and the second Capacitance parallel connection, the second electric capacity is in parallel with voltage stabilizing didoe.
Temperature detection control circuit comprises circuit of three-terminal voltage-stabilizing integrated, temperature sensitive resister, potentiometer, and temperature sensitive resister is connected with potentiometer, and one end of circuit of three-terminal voltage-stabilizing integrated is connected between temperature sensitive resister and the node of potentiometer.
Described temperature detection control circuit also comprises a light-emitting diode, and this light-emitting diode is connected with circuit of three-terminal voltage-stabilizing integrated.
Described switching tube is thyristor.
Have employed such scheme, by reduction voltage circuit, step-down is carried out to civil power, for temperature detection control circuit is powered after carrying out rectification, filtering and voltage stabilizing by power supply circuits.After temperature detection control circuit detects temperature, when temperature is lower than set point, the conducting of control switch pipe, electric heater starts heating.When temperature is lower than set point, control switch pipe ends, and heater stops heating.Control circuit of the present invention carrys out control heater heating according to the temperature detected, and does not adopt relay to control in circuit, and therefore circuit structure of the present invention is simple and automaticity is higher and can increase the service life.
Accompanying drawing explanation
Fig. 1 is electric structure structure chart of the present invention;
Embodiment
With reference to Fig. 1, a kind of heating control circuit of the present invention, comprise reduction voltage circuit, power supply circuits, temperature detection control circuit and switching tube, reduction voltage circuit is connected with power supply circuits, power supply circuits are connected with temperature detection control circuit, and temperature detection control circuit is connected with switching tube.Reduction voltage circuit is made up of the first resistance R1 and the first electric capacity C1, and the two ends of the first resistance R1 are connected with the two ends of the first electric capacity C1 respectively.First resistance R1 and first electric capacity C1 structure electricity capacity voltage dropping circuit.Power supply circuits are made up of the first diode D1, the second electric capacity C2 and voltage stabilizing didoe D3, and the first diode D1 is in parallel with the second electric capacity C2, and the second electric capacity C2 is in parallel with voltage stabilizing didoe D3.The anode tap of the first diode D1 is connected with the output of reduction voltage circuit, and the cathode terminal of the first diode directly connects one end of power supply.The anode tap of the first diode is also connected with the cathode terminal of a second diode D2, and the anode tap of the second diode D2 is connected with one end of the second electric capacity C2.Temperature detection control circuit comprises circuit of three-terminal voltage-stabilizing integrated U1, temperature sensitive resister R5, potentiometer R4, the 3rd resistance R3, the second resistance R2, LED, temperature sensitive resister R5 connects with potentiometer R4, and temperature sensitive resister R5 is connected with potentiometer R4 by the 3rd resistance R3.One end of circuit of three-terminal voltage-stabilizing integrated U1 is connected between the node of temperature sensitive resister and potentiometer R4.One end of circuit of three-terminal voltage-stabilizing integrated U1 is connected between the node of temperature sensitive resister and the 3rd resistance R3.The cathode terminal of LED is connected with circuit of three-terminal voltage-stabilizing integrated U1, and the anode tap of LED is connected with one end of the second resistance R2, and the other end of the second resistance R2 connects and is connected with switching tube Q1.Switching tube Q1 is thyristor, and the second resistance R2 is connected with the trigger end of switching tube Q1, and one end of switching tube Q1 is connected with one end of power supply, and the other end of switching tube Q1 is connected with one end of heater, and the other end of heater is connected with the other end of power supply.
By reduction voltage circuit, step-down is carried out to civil power, for temperature detection control circuit is powered after carrying out rectification, filtering and voltage stabilizing by power supply circuits.When the temperature value that temperature sets lower than temperature sensitive resister R5, the resistance of temperature sensitive resister R5 is larger, voltage conducting higher than its cut-in voltage of circuit of three-terminal voltage-stabilizing integrated U1 control end, light LED, and provide trigger voltage for switching tube Q1, make switching tube Q1 conducting, electric heater starts heating.When temperature reaches design temperature, along with the continuous reduction of temperature sensitive resister R5 resistance, the voltage drop of circuit of three-terminal voltage-stabilizing integrated U1 control end ends below cut-in voltage, and LED extinguishes, and switching tube Q1 ends, and heater stops heating.
Claims (6)
1. heating control circuit, it is characterized in that, comprise reduction voltage circuit, power supply circuits, temperature detection control circuit and switching tube, reduction voltage circuit is connected with power supply circuits, power supply circuits are connected with temperature detection control circuit, and temperature detection control circuit is connected with switching tube.
2. heating control circuit according to claim 1, is characterized in that, described reduction voltage circuit is made up of the first resistance (R1) and the first electric capacity (C1), and the two ends of the first resistance (R1) are connected with the two ends of the first electric capacity respectively.
3. heating control circuit according to claim 1, it is characterized in that, described power supply circuits are made up of the first diode (D1), the second electric capacity (C2) and voltage stabilizing didoe (D3), first diode (D1) is in parallel with the second electric capacity (C2), and the second electric capacity (C2) is in parallel with voltage stabilizing didoe (D3).
4. heating control circuit according to claim 1, it is characterized in that, temperature detection control circuit comprises circuit of three-terminal voltage-stabilizing integrated (U1), temperature sensitive resister (R5), potentiometer (R4), temperature sensitive resister (R5) is connected with potentiometer (R4), and one end of circuit of three-terminal voltage-stabilizing integrated (U1) is connected between the node of temperature sensitive resister and potentiometer (R4).
5. heating control circuit according to claim 1, is characterized in that, described temperature detection control circuit also comprises a light-emitting diode, and this light-emitting diode is connected with circuit of three-terminal voltage-stabilizing integrated (U1).
6. heating control circuit according to claim 1, is characterized in that, described switching tube is thyristor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310316855.0A CN104349517A (en) | 2013-07-25 | 2013-07-25 | Heating control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310316855.0A CN104349517A (en) | 2013-07-25 | 2013-07-25 | Heating control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104349517A true CN104349517A (en) | 2015-02-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310316855.0A Pending CN104349517A (en) | 2013-07-25 | 2013-07-25 | Heating control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104349517A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883753A (en) * | 2015-05-26 | 2015-09-02 | 施文斌 | Heating control circuit |
| CN105928055A (en) * | 2016-05-26 | 2016-09-07 | 成都灯岛科技有限公司 | Electric heater control circuit |
| CN105953302A (en) * | 2016-05-26 | 2016-09-21 | 成都灯岛科技有限公司 | Improved control circuit for electric heater |
-
2013
- 2013-07-25 CN CN201310316855.0A patent/CN104349517A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883753A (en) * | 2015-05-26 | 2015-09-02 | 施文斌 | Heating control circuit |
| CN105928055A (en) * | 2016-05-26 | 2016-09-07 | 成都灯岛科技有限公司 | Electric heater control circuit |
| CN105953302A (en) * | 2016-05-26 | 2016-09-21 | 成都灯岛科技有限公司 | Improved control circuit for electric heater |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150211 |