CN203435161U - Heating control circuit - Google Patents
Heating control circuit Download PDFInfo
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- CN203435161U CN203435161U CN201320448960.5U CN201320448960U CN203435161U CN 203435161 U CN203435161 U CN 203435161U CN 201320448960 U CN201320448960 U CN 201320448960U CN 203435161 U CN203435161 U CN 203435161U
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- control circuit
- circuit
- power supply
- temperature detection
- voltage
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Abstract
The utility model relates to a heating control circuit, including a step-down circuit, a power supply circuit, a temperature detection and control circuit and a switching tube, wherein the step-down circuit is connected with the power supply circuit, the power supply circuit is connected with the temperature detection and control circuit, and the temperature detection and control circuit is connected with the switching tube. The heating control circuit has features of simple structure, high degree of automation and prolonged service life.
Description
Technical field
The utility model 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 to realize heating function by heater strip is carried out to electric heating.The control circuit of existing heating electrical appliance, normally utilizes the action of relay to carry out heating process control.The simple relay that adopts carries out the control of heating power, easily causes heating process inhomogeneous.Heater circuit heating with full power during due to relay adhesive, heat is large; But relay does not heat again while disconnecting completely.Except heating with full power, cannot obtain uniform heating process at all.If heating electrical appliance need to change heating power, the method conventionally adopting is to coordinate heating by two heater strips, or by the interruption of relay, has moved the adjustment of heating power.If by relay frequently fast break-make realize basic heating uniformly, but because actuating of relay number of times is limited, so relay can damage very soon.Meanwhile, due to the interruption of relay, moving is to move in charged situation, and relay contact there will be spark phenomenon.Can cause the ablation of relay contact like this, cause the very fast damage of relay.
Summary of the invention
For above-mentioned technical problem, main purpose of the present utility model is, provides a kind of simple in structure and automaticity is high and the heating control circuit of long service life.
The technical scheme solving the problems of the technologies described above is as follows:
Heating control circuit, comprises reduction voltage circuit, power supply circuits, temperature detection control circuit and switching tube, and 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 comprised 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 comprised of the first diode, the second electric capacity and voltage stabilizing didoe, the first diode and the second Capacitance parallel connection, and 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.
Adopted such scheme, by reduction voltage circuit, civil power has been carried out to step-down, by power supply circuits, undertaken after rectification, filtering and voltage stabilizing as temperature detection control circuit is powered.After temperature detection control circuit detects temperature, when temperature is during lower than set point, the conducting of control switch pipe, electric heater starts heating.When temperature is during lower than set point, the cut-off of control switch pipe, heater stops heating.Control circuit of the present utility model carrys out control heater heating according to the temperature detecting, and does not adopt relay to control in circuit, and therefore circuit structure of the present utility model 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 utility model;
Embodiment
With reference to Fig. 1, a kind of heating control circuit of the present utility model, comprises reduction voltage circuit, power supply circuits, temperature detection control circuit and switching tube, and 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 comprised of the first resistance R 1 and the first capacitor C 1, and the two ends of the first resistance R 1 are connected with the two ends of the first capacitor C 1 respectively.The first resistance R 1 and the first capacitor C 1 structure electricity capacity voltage dropping circuit.Power supply circuits are comprised of the first diode D1, the second capacitor C 2 and voltage stabilizing didoe D3, and the first diode D1 is in parallel with the second capacitor C 2, and the second capacitor C 2 is in parallel with voltage stabilizing didoe D3.The first anode tap of diode D1 and the output of reduction voltage circuit are connected, 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 capacitor C 2.Temperature detection control circuit comprises circuit of three-terminal voltage-stabilizing integrated U1, temperature sensitive resister R5, potentiometer R4, the 3rd resistance R 3, the second resistance R 2, LED, temperature sensitive resister R5 connects with potentiometer R4, and temperature sensitive resister R5 connects with potentiometer R4 by the 3rd resistance R 3.One end of circuit of three-terminal voltage-stabilizing integrated U1 is connected between temperature sensitive resister and the node of potentiometer R4.One end of circuit of three-terminal voltage-stabilizing integrated U1 is connected between temperature sensitive resister and the node of the 3rd resistance R 3.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 R 2, and the other end of the second resistance R 2 connects and is connected with switching tube Q1.Switching tube Q1 is thyristor, and the second resistance R 2 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, civil power is carried out to step-down, by power supply circuits, undertaken after rectification, filtering and voltage stabilizing as temperature detection control circuit is powered.When temperature value that temperature is set 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 constantly reducing of temperature sensitive resister R5 resistance, the voltage drop of circuit of three-terminal voltage-stabilizing integrated U1 control end is below cut-in voltage and end, and LED extinguishes, switching tube Q1 cut-off, 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 comprised 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 comprised of the first diode (D1), the second electric capacity (C2) and voltage stabilizing didoe (D3), 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).
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 temperature sensitive resister and the node of 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 |
|---|---|---|---|
| CN201320448960.5U CN203435161U (en) | 2013-07-25 | 2013-07-25 | Heating control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320448960.5U CN203435161U (en) | 2013-07-25 | 2013-07-25 | Heating control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203435161U true CN203435161U (en) | 2014-02-12 |
Family
ID=50064170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320448960.5U Expired - Fee Related CN203435161U (en) | 2013-07-25 | 2013-07-25 | Heating control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203435161U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883753A (en) * | 2015-05-26 | 2015-09-02 | 施文斌 | Heating control circuit |
-
2013
- 2013-07-25 CN CN201320448960.5U patent/CN203435161U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883753A (en) * | 2015-05-26 | 2015-09-02 | 施文斌 | Heating control circuit |
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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 |
Granted publication date: 20140212 Termination date: 20140725 |
|
| EXPY | Termination of patent right or utility model |