CN105673541A - Electric fan control circuit - Google Patents
Electric fan control circuit Download PDFInfo
- Publication number
- CN105673541A CN105673541A CN201511031069.1A CN201511031069A CN105673541A CN 105673541 A CN105673541 A CN 105673541A CN 201511031069 A CN201511031069 A CN 201511031069A CN 105673541 A CN105673541 A CN 105673541A
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- Prior art keywords
- resistance
- audion
- electric fan
- control circuit
- ground connection
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Amplifiers (AREA)
Abstract
The embodiment of the invention discloses an electric fan control circuit. A short-circuit protection function, a slow start function and an over-voltage protection function are achieved. The electric fan control circuit provided by the invention comprises a voltage regulator circuit and an over-voltage protection circuit.
Description
Technical field
The present invention relates to electronic circuit field, further to a kind of electric fan control circuit.
Background technology
Existing fan voltage scalability is poor, it does not have short-circuit protection function, it does not have soft start function, it does not have over-voltage protecting function.
Summary of the invention
The invention provides a kind of electric fan control circuit, there is short-circuit protection function, there is soft start function, there is over-voltage protecting function.
A kind of electric fan control circuit provided by the invention, including:
Voltage regulator circuit and overvoltage crowbar;
This voltage regulator circuit includes:
Operational amplifier U, the in-phase input end of operational amplifier U, inverting input and power input are connected with power supply respectively, and the outfan of operational amplifier U and the base stage of the first audion Q4 connect;
Above-mentioned in-phase input end is through the first resistance R21, and inverting input is through the second resistance R20;
Branch road between second resistance R20 and inverting input ground connection after the 3rd resistance R19;
Branch road between first resistance R21 and in-phase input end is connected through the colelctor electrode of the 7th resistance R16 and the first audion Q4;
The intermediate node of the first resistance R21 and the seven resistance R16 is set out and is divided into two branch roads, and wherein one article through the 4th resistance R32 ground connection;
The colelctor electrode of the first audion Q4 is connected with electric fan FAN;
This overvoltage crowbar includes:
One end connects electric fan FAN, the other end connects the metal-oxide-semiconductor M of power supply, and the branch road that the node between this metal-oxide-semiconductor M and power supply sets out is ground connection after the 4th audion Q5, and the base stage of the 4th audion Q5 is connected with power supply, the colelctor electrode of the 4th audion Q5 is connected with metal-oxide-semiconductor M, grounded emitter;
One branch road of the other end of electric fan FAN ground connection after the first diode ZD4, another article of branch road ground connection after the second audion Q7 and the three audion Q6, this second audion Q7 and the 3rd audion Q6 forms self-locking circuit, the colelctor electrode of the second audion Q7 and the base stage of the 3rd audion Q6 connect, the base stage of the 3rd audion Q6 is connected with the colelctor electrode of the second audion Q7, the grounded emitter of the 3rd audion Q6.
Optionally,
4th audion Q5 is in parallel with the 16th resistance R22 and the 4th electric capacity TC2 respectively.
Optionally,
Power supply is connected through the input of negative temperature coefficient resister RT2 with metal-oxide-semiconductor M.
Optionally,
The anode of the first diode ZD4 is through the 8th resistance R26 and the nine resistance R29 ground connection;
The branch road that node between 8th resistance R26 and the 9th resistance R29 sets out ground connection after the 11st resistance R30, the first diode group D3 and the first electric capacity C12.
Optionally,
4th resistance R32 and the five resistance R17 is in parallel.
Optionally,
Connect between operational amplifier U and the first audion Q4 the 6th resistance R15.
Optionally,
Electric fan FAN connects through the colelctor electrode of the 12nd resistance R28 and the second triode Q7;
13rd resistance R31 and the 12 resistance R28 is in parallel, and is connected with the colelctor electrode of the 3rd audion Q6;
Electric fan FAN connects through the tenth resistance R27 and the second diode group D4, and the other end of the second diode group D4 is connected with the base stage stating the second audion Q7;
Electric fan FAN is through the 3rd electric capacity TC4 ground connection.
Optionally,
Metal-oxide-semiconductor M and the 15 resistance R25 is in parallel, the 15th resistance R25 and the second electric capacity C11 series connection;
The G pole of metal-oxide-semiconductor M connects through the colelctor electrode of the 17th resistance R24 and the four audion Q5;
Metal-oxide-semiconductor M and the second diode ZD3 series connection, the second diode ZD3 and the 18 resistance R23 is in parallel.
Optionally,
Above-mentioned power supply is 12V DC source.
Optionally,
Second audion Q7 is PNP type triode.
As can be seen from the above technical solutions, the embodiment of the present invention has the advantage that
The present embodiment includes: including: voltage regulator circuit and overvoltage crowbar; This voltage regulator circuit includes: operational amplifier U, and the in-phase input end of operational amplifier U, inverting input and power input are connected with power supply respectively, and the outfan of operational amplifier U and the base stage of the first audion Q4 connect; Above-mentioned in-phase input end is through the first resistance R21, and inverting input is through the second resistance R20; Branch road between second resistance R20 and inverting input ground connection after the 3rd resistance R19; Branch road between first resistance R21 and in-phase input end is connected through the colelctor electrode of the 7th resistance R16 and the first audion Q4; The intermediate node of the first resistance R21 and the seven resistance R16 is set out and is divided into two branch roads, and wherein one article through the 4th resistance R32 ground connection; The colelctor electrode of the first audion Q4 is connected with electric fan FAN; This overvoltage crowbar includes: one end connects electric fan FAN, the other end connects the metal-oxide-semiconductor M of power supply, the branch road that node between this metal-oxide-semiconductor M and power supply sets out is ground connection after the 4th audion Q5, the base stage of the 4th audion Q5 is connected with power supply, the colelctor electrode of the 4th audion Q5 is connected with metal-oxide-semiconductor M, grounded emitter; One branch road of the other end of electric fan FAN ground connection after the first diode ZD4, another article of branch road ground connection after the second audion Q7 and the three audion Q6, this second audion Q7 and the 3rd audion Q6 forms self-locking circuit, the colelctor electrode of the second audion Q7 and the base stage of the 3rd audion Q6 connect, the base stage of the 3rd audion Q6 is connected with the colelctor electrode of the second audion Q7, the grounded emitter of the 3rd audion Q6. Solve the problem that fan minimum voltage can not accurately control; The problem solving fan voltage scalability difference; The problem of solution system overheat protector; The problem solving system overvoltage protection.
Accompanying drawing explanation
Fig. 1 is one electric fan control circuit first embodiment circuit diagram of the present invention.
Detailed description of the invention
The invention provides a kind of electric fan control circuit, there is short-circuit protection function, there is soft start function, there is over-voltage protecting function.
Refer to Fig. 1, a kind of electric fan control circuit embodiment provided by the invention, including:
Voltage regulator circuit and overvoltage crowbar;
This voltage regulator circuit includes:
Operational amplifier U, the in-phase input end of operational amplifier U, inverting input and power input are connected with power supply respectively, and the outfan of operational amplifier U and the base stage of the first audion Q4 connect;
Above-mentioned in-phase input end is through the first resistance R21, and inverting input is through the second resistance R20;
Branch road between second resistance R20 and inverting input ground connection after the 3rd resistance R19;
Branch road between first resistance R21 and in-phase input end is connected through the colelctor electrode of the 7th resistance R16 and the first audion Q4;
The intermediate node of the first resistance R21 and the seven resistance R16 is set out and is divided into two branch roads, and wherein one article through the 4th resistance R32 ground connection;
The colelctor electrode of the first audion Q4 is connected with electric fan FAN;
This overvoltage crowbar includes:
One end connects electric fan FAN, the other end connects the metal-oxide-semiconductor M of power supply, and the branch road that the node between this metal-oxide-semiconductor M and power supply sets out is ground connection after the 4th audion Q5, and the base stage of the 4th audion Q5 is connected with power supply, the colelctor electrode of the 4th audion Q5 is connected with metal-oxide-semiconductor M, grounded emitter;
One branch road of the other end of electric fan FAN ground connection after the first diode ZD4, another article of branch road ground connection after the second audion Q7 and the three audion Q6, this second audion Q7 and the 3rd audion Q6 forms self-locking circuit, the colelctor electrode of the second audion Q7 and the base stage of the 3rd audion Q6 connect, the base stage of the 3rd audion Q6 is connected with the colelctor electrode of the second audion Q7, the grounded emitter of the 3rd audion Q6.
In the present embodiment, two pin voltage of operational amplifier U are:
Vnet1=12V*R20/ (R20+R19), can obtain according to the operational amplifier U disconnected principle of empty short void:
Vnet1=Vnet2, by Inet2=0Vnet2/R32-(12V-Vnet2)/R21=(VA-Vnet2)/R16, after being obtained VA by above formula, the voltage Vfan=12V-VA. of fan FAN can be obtained Vfan from above, fan voltage curve can pass through to regulate the 4th resistance R32,3rd resistance R19, the second resistance R20, the value of the first resistance R21 and the 7th resistance R16 realizes accurate control.
When A point voltage is normal time, the first diode ZD4 is in cut-off state, overvoltage protection (OVP, OverVollageProtection) circuit does not work, when A point has high voltage to come in, when high voltage reaches the breakdown voltage of the first diode ZD4, cause the first diode ZD4 reverse-conducting, , 3rd audion Q6 base voltage is driven high, 3rd audion Q6 conducting, second audion Q7 base voltage is pulled low, second audion Q7 conducting, owing to the second audion Q7 and the three audion Q6 forms latching circuit, by locked in low level for B point, it is believed that the base voltage of the 4th audion Q5 is pulled low by high voltage, 4th audion Q5 cut-off, the G pole tension of metal-oxide-semiconductor M is driven high, metal-oxide-semiconductor M ends, motor quits work, it is in OVP state.
This electric fan control circuit farther includes: the 4th audion Q5 is in parallel with the 16th resistance R22 and the 4th electric capacity TC2 respectively.
In the present embodiment, after circuit loads 12V unidirectional current, B point is in high level, and the 4th audion Q5 conducting, metal-oxide-semiconductor M base stage drags down, and metal-oxide-semiconductor M turns on, owing to the ON time of metal-oxide-semiconductor M is determined by the 4th electric capacity TC2 size, thus reaching the purpose of time delay.
This electric fan control circuit farther includes: power supply is connected through the input of negative temperature coefficient resister RT2 with metal-oxide-semiconductor M.
In the present embodiment, RT2 is negative temperature coefficient resister, and when the electric current that powers on is very big time, RT2 resistance is very big, only small by the electric current of RT2, and after RT2 temperature rises, resistance drops to practically zero, and circuit is in normal operating conditions.
It should be noted that negative tempperature coefficient thermistor (NTC, NegativeTemperatureCoefficient) critesistor, it is that a quasi-resistance value increases with temperature and a kind of sensor resistance of reducing.Referring to the very big semi-conducting material of negative temperature coefficient or components and parts, so-called NTC themistor is exactly negative temperature coefficient thermistor. It is with metal-oxides such as manganese, cobalt, nickel and copper for main material, adopts ceramic process to be fabricated by. These metal oxide materials all have semiconductor property because on electrically conducting manner the semi-conducting material such as all fours germanium, silicon. When temperature is low, carrier (electronics and the hole) number of these oxide materials is few, so its resistance value is higher; Along with the rising of temperature, carrier number increases, so resistance value reduces. NTC themistor excursion at room temperature at 100～1000000 ohm, temperature coefficient-2%～-6.5%. NTC themistor can be widely used in the aspects such as thermometric, temperature control, temperature-compensating by NTC themistor. It is widely used in various electronic original part, such as temperature sensor, composite electric fuse and the heater etc. that is automatically adjusted.
This electric fan control circuit farther includes: the anode of the first diode ZD4 is through the 8th resistance R26 and the nine resistance R29 ground connection; The branch road that node between 8th resistance R26 and the 9th resistance R29 sets out ground connection after the 11st resistance R30, the first diode group D3 and the first electric capacity C12.
This electric fan control circuit farther includes: the 4th resistance R32 and the five resistance R17 is in parallel, and the collaborative 4th resistance R32 of the 5th resistance R17 regulates voltage.
Connect between operational amplifier U and the first audion Q4 the 6th resistance R15, and being used for is the first audion Q4 current limliting.
This electric fan control circuit farther includes: electric fan FAN connects through the colelctor electrode of the 12nd resistance R28 and the second triode Q7; 13rd resistance R31 and the 12 resistance R28 is in parallel, and is connected with the colelctor electrode of the 3rd audion Q6; Electric fan FAN connects through the tenth resistance R27 and the second diode group D4, and the other end of the second diode group D4 is connected with the base stage stating the second audion Q7; Electric fan FAN is through the 3rd electric capacity TC4 ground connection.
Metal-oxide-semiconductor M and the 15 resistance R25 is in parallel, the 15th resistance R25 and the second electric capacity C11 series connection;
The G pole of metal-oxide-semiconductor M connects through the colelctor electrode of the 17th resistance R24 and the four audion Q5;
Metal-oxide-semiconductor M and the second diode ZD3 series connection, the second diode ZD3 and the 18 resistance R23 is in parallel.
It should be noted that above-mentioned power supply is 12V DC source, the use function that the function of above-mentioned unexplained electronic component is known to the skilled person, do not repeat.
Above-mentioned audion is not limited to NPN and/or PNP type triode. It is not especially limited at this.
Those skilled in the art is it can be understood that arrive, for convenience and simplicity of description, and the specific works process of the device of foregoing description, it is possible to reference to the corresponding process in preceding method embodiment, do not repeat them here. In several embodiments provided herein, it should be understood that disclosed device can realize by another way.
Above example only in order to technical scheme to be described, is not intended to limit; Although the present invention being described in detail with reference to previous embodiment, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein portion of techniques feature is carried out equivalent replacement; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. an electric fan control circuit, it is characterised in that including:
Voltage regulator circuit and overvoltage crowbar;
Described voltage regulator circuit includes:
Operational amplifier (U), the in-phase input end of described operational amplifier (U), inverting input and power input are connected with power supply respectively, and the outfan of described operational amplifier (U) and the base stage of the first audion (Q4) connect;
Described in-phase input end is through the first resistance (R21), and described inverting input is through the second resistance (R20);
Branch road between described second resistance (R20) and described inverting input is ground connection after the 3rd resistance (R19);
Branch road between described first resistance (R21) and described in-phase input end is connected through the colelctor electrode of the 7th resistance (R16) with described first audion (Q4);
The intermediate node of described first resistance (R21) and described 7th resistance (R16) is set out and is divided into two articles of branch roads, and wherein one article through the 4th resistance (R32) ground connection;
The colelctor electrode of described first audion (Q4) is connected with electric fan (FAN);
Described overvoltage crowbar includes:
One end connects described electric fan (FAN), the other end connects the metal-oxide-semiconductor (M) of power supply, the branch road that node between described metal-oxide-semiconductor (M) and described power supply sets out is ground connection after the 4th audion (Q5), the base stage of described 4th audion (Q5) is connected with power supply, the colelctor electrode of described 4th audion (Q5) is connected with metal-oxide-semiconductor (M), grounded emitter;
Branch road of the other end of described electric fan (FAN) ground connection after the first diode (ZD4), another article of branch road ground connection after the second audion (Q7) and the 3rd audion (Q6), described second audion (Q7) and described 3rd audion (Q6) form self-locking circuit, the colelctor electrode of described second audion (Q7) is connected with the base stage of described 3rd audion (Q6), the base stage of described 3rd audion (Q6) is connected with the colelctor electrode of described second audion (Q7), the grounded emitter of described 3rd audion (Q6).
2. electric fan control circuit according to claim 1, it is characterised in that
Described 4th audion (Q5) is in parallel with the 16th resistance (R22) and the 4th electric capacity (TC2) respectively.
3. electric fan control circuit according to claim 1, it is characterised in that
Described power supply is connected through the input of negative temperature coefficient resister (RT2) with metal-oxide-semiconductor (M).
4. electric fan control circuit according to claim 1, it is characterised in that
The anode of described first diode (ZD4) is through the 8th resistance (R26) and the 9th resistance (R29) ground connection;
Branch road ground connection after the 11st resistance (R30), the first diode group (D3) and the first electric capacity (C12) that node between described 8th resistance (R26) and the 9th resistance (R29) sets out.
5. electric fan control circuit according to claim 1, it is characterised in that
Described 4th resistance (R32) is in parallel with the 5th resistance (R17).
6. electric fan control circuit according to claim 1, it is characterised in that
Connect between described operational amplifier (U) with described first audion (Q4) the 6th resistance (R15).
7. electric fan control circuit according to claim 1, it is characterised in that
Described electric fan (FAN) is connected with the colelctor electrode of the second triode (Q7) through the 12nd resistance (R28);
13rd resistance (R31) is in parallel with described 12nd resistance (R28), and is connected with the colelctor electrode of the 3rd audion (Q6);
Described electric fan (FAN) is connected with the second diode group (D4) through the tenth resistance (R27), and the other end of described second diode group (D4) is connected with the base stage of described second audion (Q7);
Described electric fan (FAN) is through the 3rd electric capacity (TC4) ground connection.
8. electric fan control circuit according to claim 1, it is characterised in that
Described metal-oxide-semiconductor (M) is in parallel with the 15th resistance (R25), and described 15th resistance (R25) is connected with the second electric capacity (C11);
The G pole of described metal-oxide-semiconductor (M) is connected through the colelctor electrode of the 17th resistance (R24) with described 4th audion (Q5);
Described metal-oxide-semiconductor (M) is connected with the second diode (ZD3), and described second diode (ZD3) is in parallel with the 18th resistance (R23).
9. electric fan control circuit according to any one of claim 1 to 8, it is characterised in that
Described power supply is 12V DC source.
10. electric fan control circuit according to any one of claim 1 to 8, it is characterised in that
Described second audion (Q7) is PNP type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511031069.1A CN105673541A (en) | 2015-12-30 | 2015-12-30 | Electric fan control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511031069.1A CN105673541A (en) | 2015-12-30 | 2015-12-30 | Electric fan control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105673541A true CN105673541A (en) | 2016-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511031069.1A Pending CN105673541A (en) | 2015-12-30 | 2015-12-30 | Electric fan control circuit |
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| CN (1) | CN105673541A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0731190A (en) * | 1993-07-14 | 1995-01-31 | Nec Shizuoka Ltd | Drive circuit for fan motor |
| CN102954022A (en) * | 2012-11-01 | 2013-03-06 | 广东威创视讯科技股份有限公司 | Fan control circuit |
| CN103647339A (en) * | 2013-12-20 | 2014-03-19 | 广东威创视讯科技股份有限公司 | Power supply device with multiple power sources in parallel connection |
| CN103683909A (en) * | 2013-12-27 | 2014-03-26 | 广东威创视讯科技股份有限公司 | Display system, power supply method and power supply device thereof |
| CN104533823A (en) * | 2014-12-29 | 2015-04-22 | 广东威创视讯科技股份有限公司 | Temperature-control rotating speed control device of direct-current fan |
-
2015
- 2015-12-30 CN CN201511031069.1A patent/CN105673541A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0731190A (en) * | 1993-07-14 | 1995-01-31 | Nec Shizuoka Ltd | Drive circuit for fan motor |
| CN102954022A (en) * | 2012-11-01 | 2013-03-06 | 广东威创视讯科技股份有限公司 | Fan control circuit |
| CN103647339A (en) * | 2013-12-20 | 2014-03-19 | 广东威创视讯科技股份有限公司 | Power supply device with multiple power sources in parallel connection |
| CN103683909A (en) * | 2013-12-27 | 2014-03-26 | 广东威创视讯科技股份有限公司 | Display system, power supply method and power supply device thereof |
| CN104533823A (en) * | 2014-12-29 | 2015-04-22 | 广东威创视讯科技股份有限公司 | Temperature-control rotating speed control device of direct-current fan |
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Application publication date: 20160615 |