CN108514205B - Low-cost constant temperature circuit of electric hair drier - Google Patents
Low-cost constant temperature circuit of electric hair drier Download PDFInfo
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- CN108514205B CN108514205B CN201810571237.3A CN201810571237A CN108514205B CN 108514205 B CN108514205 B CN 108514205B CN 201810571237 A CN201810571237 A CN 201810571237A CN 108514205 B CN108514205 B CN 108514205B
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- circuit
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- npn triode
- capacitor
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- 239000003990 capacitor Substances 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 238000005485 electric heating Methods 0.000 abstract 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
- A45D20/00—Hair drying devices; Accessories therefor
- A45D20/04—Hot-air producers
- A45D20/08—Hot-air producers heated electrically
- A45D20/10—Hand-held drying devices, e.g. air douches
-
- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
- A45D20/00—Hair drying devices; Accessories therefor
- A45D20/04—Hot-air producers
- A45D20/08—Hot-air producers heated electrically
- A45D20/10—Hand-held drying devices, e.g. air douches
- A45D20/12—Details thereof or accessories therefor, e.g. nozzles, stands
Landscapes
- Cleaning And Drying Hair (AREA)
Abstract
The invention provides a low-cost electric hair drier constant temperature circuit which comprises a resistor R1 (1), a negative temperature coefficient thermistor RT1 (2), a resistor R2 (3), a 555 circuit U1 (4), an NPN triode Q1 (5), an electric heating wire OV1 (6), an NPN triode Q2 (7), a capacitor C1 (8), a capacitor C2 (9), a resistor R4 (10), a resistor R3 (11) and an N channel MOSFET Q3 (12). The multivibrator circuit is formed by taking the 555 circuit U1 (4) as a core, the temperature of the air port can be automatically tracked, the heating temperature can be automatically adjusted according to the multivibrator circuit, the multivibrator circuit is simple, efficient, reliable and safe, the temperature fluctuation of the air outlet of the electric hair drier can be controlled within +/-1 ℃ by using the multivibrator circuit, the heating speed and the wind power of the electric hair drier can not be influenced, and the warm air of the electric hair drier can be maintained at a constant temperature.
Description
Technical Field
The invention relates to a low-cost constant-temperature circuit of an electric hair drier.
Background
At present, low-cost hair dryers in the market are characterized by large wind power and quick heating, but poor constant temperature performance, large upward temperature fluctuation, hair injury and even easy human scalding, so that a low-cost constant temperature control solution is needed.
Disclosure of Invention
The invention provides a low-cost electric hair drier constant temperature circuit for solving the problems. The circuit can automatically track the temperature of the air outlet, automatically adjust the heating temperature according to the temperature, is simple, efficient, reliable and safe, and can control the temperature fluctuation of the air outlet of the electric hair drier within +/-1 ℃ without affecting the heating speed and the wind power of the electric hair drier.
In order to achieve the above purpose, the invention adopts the following technical scheme: the solar energy power generation device comprises a resistor R1 (1), a negative temperature coefficient thermistor RT1 (2), a resistor R2 (3), a 555 circuit U1 (4), an NPN triode Q1 (5), a heating wire OV1 (6), an NPN triode Q2 (7), a capacitor C1 (8), a capacitor C2 (9), a resistor R4 (10), a resistor R3 (11) and an N channel MOSFET Q3 (12). The circuit comprises a 555 circuit U1 (4) pin 1, a capacitor C1 (8) lower end and a capacitor C2 (9) lower end, wherein the 555 circuit U1 (4) pin 2 is connected with the 555 circuit U1 (4) pin 6, the capacitor C2 (9) upper end and the resistor R1 (1) lower end, the 555 circuit U1 (4) pin 3 is connected with an NPN triode Q1 (5) base electrode, the 555 circuit U1 (4) pin 4 is connected with a +5V direct current power supply, the 555 circuit U1 (4) pin 8, the resistor R2 (3) left end and the negative temperature coefficient thermistor RT1 (2) left end, the 555 circuit U1 (4) pin 5 is connected with the capacitor C1 (8) upper end, and the 555 circuit U1 (4) pin 7 is connected with the resistor R1 (1) upper end, the resistor R2 (3) right end and the negative temperature coefficient thermistor RT1 (2) right end; the collector of the NPN triode Q1 (5) is connected with a +12V direct current power supply and the collector of the NPN triode Q2 (7), and the emitter of the NPN triode Q1 (5) is connected with the base of the NPN triode Q2 (7); the emitter of the NPN triode Q2 (7) is connected with the upper end of the resistor R4 (10) and the left end of the resistor R3 (11); the source electrode of the N-channel MOSFET Q3 (12) is grounded and the lower end of the resistor R4 (10), and the drain electrode of the N-channel MOSFET Q3 (12) is connected with the lower end of the heating wire OV1 (6); the upper end of the heating wire OV1 (6) is connected with a +36V direct current power supply.
Further, pin 1 of the 555 circuit U1 (4) is grounded, the lower end of the capacitor C1 (8) and the lower end of the capacitor C2 (9), pin 2 of the 555 circuit U1 (4) is connected with pin 6 of the 555 circuit U1 (4), the upper end of the capacitor C2 (9) and the lower end of the resistor R1 (1), pin 3 of the 555 circuit U1 (4) is connected with the base of the NPN transistor Q1 (5), pin 4 of the 555 circuit U1 (4) is connected with a +5v dc power supply, pin 8 of the 555 circuit U1 (4), the left end of the resistor R2 (3) and the left end of the negative temperature coefficient thermistor RT1 (2), pin 5 of the 555 circuit U1 (4) is connected with the upper end of the capacitor C1 (8), pin 7 of the 555 circuit U1 (4) is connected with the upper end of the resistor R1 (1), the right end of the resistor R2 (3) and the right end of the negative temperature coefficient thermistor RT1 (2); the collector of the NPN triode Q1 (5) is connected with a +12V direct current power supply and the collector of the NPN triode Q2 (7), and the emitter of the NPN triode Q1 (5) is connected with the base of the NPN triode Q2 (7); the emitter of the NPN triode Q2 (7) is connected with the upper end of the resistor R4 (10) and the left end of the resistor R3 (11); the source electrode of the N-channel MOSFET Q3 (12) is grounded and the lower end of the resistor R4 (10), and the drain electrode of the N-channel MOSFET Q3 (12) is connected with the lower end of the heating wire OV1 (6); the upper end of the heating wire OV1 (6) is connected with a +36V direct current power supply; .
The model of the 555 circuit U1 (4) is NE555.
The model of the NPN type triode Q1 (5) and the model of the NPN type triode Q2 (7) are 2N2222.
The model of the N-channel MOSFET Q3 (12) is IRCZ34.
The model of the negative temperature coefficient thermistor RT1 (2) is NCP15XH103.
The invention has the following beneficial effects: the invention can realize automatic tracking of the temperature of the air port with extremely low cost, and automatically adjust the heating temperature according to the temperature, thereby controlling the temperature fluctuation of the air outlet of the electric hair drier within +/-1 degree, and simultaneously not affecting the heating speed and the wind power of the electric hair drier.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the low-cost electric hair dryer constant temperature circuit comprises a resistor R1 (1), a negative temperature coefficient thermistor RT1 (2), a resistor R2 (3), a 555 circuit U1 (4), an NPN triode Q1 (5), a heating wire OV1 (6), an NPN triode Q2 (7), a capacitor C1 (8), a capacitor C2 (9), a resistor R4 (10), a resistor R3 (11) and an N-channel MOSFET Q3 (12). The multivibrator circuit is formed by taking the 555 circuit U1 (4) as a core, when the temperature of the negative temperature coefficient thermistor RT1 (2) attached to the air outlet of the electric hair drier is increased, the parallel resistance value of the negative temperature coefficient thermistor RT1 (2) and the resistor R2 (3) is reduced, so that the square wave duty ratio output by the pin 3 of the 555 circuit U1 (4) is reduced, the on time of the NPN triode Q1 (5) and the NPN triode Q2 (7) is reduced, and the on time of the N channel MOSFET Q3 (12) is also reduced, so that the electrifying time of the heating wire OV1 (6) is reduced, and the temperature is reduced; when the temperature of the negative temperature coefficient thermistor RT1 (2) attached to the heating wire OV1 (6) is reduced, the parallel resistance of the negative temperature coefficient thermistor RT1 (2) and the resistor R2 (3) is increased, so that the square wave duty ratio output by the pin 3 of the 555 circuit U1 (4) is increased, the turn-on time of the NPN triode Q1 (5) and the NPN triode Q2 (7) is increased, and the turn-on time of the N channel MOSFET Q3 (12) is also increased, so that the power-on time of the heating wire OV1 (6) is increased. So that the warm air of the electric hair dryer can be maintained at a constant temperature. The circuit comprises a 555 circuit U1 (4) pin 1, a capacitor C1 (8) lower end and a capacitor C2 (9) lower end, wherein the 555 circuit U1 (4) pin 2 is connected with the 555 circuit U1 (4) pin 6, the capacitor C2 (9) upper end and the resistor R1 (1) lower end, the 555 circuit U1 (4) pin 3 is connected with an NPN triode Q1 (5) base electrode, the 555 circuit U1 (4) pin 4 is connected with a +5V direct current power supply, the 555 circuit U1 (4) pin 8, the resistor R2 (3) left end and the negative temperature coefficient thermistor RT1 (2) left end, the 555 circuit U1 (4) pin 5 is connected with the capacitor C1 (8) upper end, and the 555 circuit U1 (4) pin 7 is connected with the resistor R1 (1) upper end, the resistor R2 (3) right end and the negative temperature coefficient thermistor RT1 (2) right end; the collector of the NPN triode Q1 (5) is connected with a +12V direct current power supply and the collector of the NPN triode Q2 (7), and the emitter of the NPN triode Q1 (5) is connected with the base of the NPN triode Q2 (7); the emitter of the NPN triode Q2 (7) is connected with the upper end of the resistor R4 (10) and the left end of the resistor R3 (11); the source electrode of the N-channel MOSFET Q3 (12) is grounded and the lower end of the resistor R4 (10), and the drain electrode of the N-channel MOSFET Q3 (12) is connected with the lower end of the heating wire OV1 (6); the upper end of the heating wire OV1 (6) is connected with a +36V direct current power supply. The model of the 555 circuit U1 (4) is NE555. The model of the NPN type triode Q1 (5) and the model of the NPN type triode Q2 (7) are 2N2222. The model of the N-channel MOSFET Q3 (12) is IRCZ34. The model of the negative temperature coefficient thermistor RT1 (2) is NCP15XH103.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (3)
1. Low-cost hairdryer constant temperature circuit, its characterized in that: the temperature-sensitive resistor comprises a resistor R1 (1), a negative temperature coefficient thermistor RT1 (2), a resistor R2 (3), a 555 circuit U1 (4), an NPN triode Q1 (5), a heating wire OV1 (6), an NPN triode Q2 (7), a capacitor C1 (8), a capacitor C2 (9), a resistor R4 (10), a resistor R3 (11) and an N channel MOSFETQ3 (12); the circuit comprises a 555 circuit U1 (4) pin 1, a capacitor C1 (8) lower end and a capacitor C2 (9) lower end, wherein the 555 circuit U1 (4) pin 2 is connected with the 555 circuit U1 (4) pin 6, the capacitor C2 (9) upper end and the resistor R1 (1) lower end, the 555 circuit U1 (4) pin 3 is connected with an NPN triode Q1 (5) base electrode, the 555 circuit U1 (4) pin 4 is connected with a +5V direct current power supply, the 555 circuit U1 (4) pin 8, the resistor R2 (3) left end and the negative temperature coefficient thermistor RT1 (2) left end, the 555 circuit U1 (4) pin 5 is connected with the capacitor C1 (8) upper end, and the 555 circuit U1 (4) pin 7 is connected with the resistor R1 (1) upper end, the resistor R2 (3) right end and the negative temperature coefficient thermistor RT1 (2) right end; the collector of the NPN triode Q1 (5) is connected with a +12V direct current power supply and the collector of the NPN triode Q2 (7), and the emitter of the NPN triode Q1 (5) is connected with the base of the NPN triode Q2 (7); the emitter of the NPN triode Q2 (7) is connected with the upper end of the resistor R4 (10) and the left end of the resistor R3 (11); the source electrode of the N-channel MOSFETQ3 (12) is grounded and the lower end of the resistor R4 (10), and the drain electrode of the N-channel MOSFETQ3 (12) is connected with the lower end of the heating wire OV1 (6); the upper end of the heating wire OV1 (6) is connected with a +36V direct current power supply;
the model of the 555 circuit U1 (4) is NE555;
the model of the NPN type triode Q1 (5) and the model of the NPN type triode Q2 (7) are 2N2222.
2. The low cost electric hair dryer thermostatic circuit of claim 1, wherein: the model of the N-channel MOSFETQ3 (12) is IRCZ34.
3. The low cost electric hair dryer thermostatic circuit of claim 1, wherein: the model of the negative temperature coefficient thermistor RT1 (2) is NCP15XH103.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810571237.3A CN108514205B (en) | 2018-06-06 | 2018-06-06 | Low-cost constant temperature circuit of electric hair drier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810571237.3A CN108514205B (en) | 2018-06-06 | 2018-06-06 | Low-cost constant temperature circuit of electric hair drier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108514205A CN108514205A (en) | 2018-09-11 |
| CN108514205B true CN108514205B (en) | 2023-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810571237.3A Active CN108514205B (en) | 2018-06-06 | 2018-06-06 | Low-cost constant temperature circuit of electric hair drier |
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| Country | Link |
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| CN (1) | CN108514205B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201022454Y (en) * | 2007-03-07 | 2008-02-20 | 黄山市华特电器有限公司 | Far infrared constant-temperature electric hair drier |
| CN107949293A (en) * | 2015-12-28 | 2018-04-20 | 麦克赛尔控股株式会社 | Air drier |
| CN208581918U (en) * | 2018-06-06 | 2019-03-08 | 昆明理工大学津桥学院 | Low-cost electric blowing constant-temperature circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2751833B2 (en) * | 1977-11-19 | 1980-05-29 | Braun Ag, 6000 Frankfurt | Electric hairdryer with fan and heating |
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2018
- 2018-06-06 CN CN201810571237.3A patent/CN108514205B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201022454Y (en) * | 2007-03-07 | 2008-02-20 | 黄山市华特电器有限公司 | Far infrared constant-temperature electric hair drier |
| CN107949293A (en) * | 2015-12-28 | 2018-04-20 | 麦克赛尔控股株式会社 | Air drier |
| CN208581918U (en) * | 2018-06-06 | 2019-03-08 | 昆明理工大学津桥学院 | Low-cost electric blowing constant-temperature circuit |
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| Publication number | Publication date |
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| CN108514205A (en) | 2018-09-11 |
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