CN203926088U - DC fan control gear - Google Patents
DC fan control gear Download PDFInfo
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- CN203926088U CN203926088U CN201420151491.5U CN201420151491U CN203926088U CN 203926088 U CN203926088 U CN 203926088U CN 201420151491 U CN201420151491 U CN 201420151491U CN 203926088 U CN203926088 U CN 203926088U
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- circuit
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- fan
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- single chip
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- 238000005070 sampling Methods 0.000 claims description 17
- 230000003321 amplification Effects 0.000 claims description 11
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000004146 energy storage Methods 0.000 description 7
- 230000005669 field effect Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
A kind of DC fan control gear, comprise power circuit, single chip circuit, pwm circuit, DC fan, power circuit provides power supply for single chip circuit, DC fan, the input end of pwm circuit is electrically connected with single chip circuit PWM mouth, also comprise the DAC circuit being electrically connected with power circuit, the output terminal of pwm circuit is electrically connected with the voltage input of DC fan by DAC circuit, by reducing circuit elements device, make that control circuit is simple in structure, circuit board size is little, control cost low, reliability is strong.
Description
Technical field
The utility model relates to a kind of DC fan control gear, is applicable to gas water-heater field.
Background technique
At present, in existing large flow forced exhausting gas water heater technology, the main whole rotating speed using scope of principal voltage amplitude modulation speed regulating control DC fan that still adopts, principal voltage amplitude modulation speed governing is by closed loop BUCK ON-OFF control circuit, buffer amplifier circuit composition, wherein closed loop BUCK ON-OFF control circuit includes again switching tube, energy storage power inductance, afterflow Schottky diode, the emitter of switching tube is connected with buffer amplifier circuit resistance, switching tube base stage is connected with buffer amplifier circuit resistance, the collector electrode of switching tube is connected with one end of energy storage power inductance and the negative pole of afterflow Schottky diode, the plus earth of afterflow Schottky diode, the other end of energy storage power inductance is connected with DC fan.Single-chip microcomputer is given certain PWM value by buffer amplifier circuit and principal voltage amplitude modulation alignment circuit, drives DC fan to move with stabilized (steady-state) speed, reaches variable voltage control object.Component number is many, causes whole DC fan control circuit complex structure, and circuit board size is large.
Because switching tube is large electric current PNP power tube or P type field effect transistor, the height of controlling cost, and the performance of batch property is difficult to ensure conformity; Energy storage power inductance is easily subject to the impact of magnetic material, poor reliability.For overcoming above-mentioned defect, DC fan control gear is improved.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of DC fan control gear, by reducing circuit elements device, makes that control circuit is simple in structure, circuit board size is little, controls cost low, and reliability is strong.
The technological scheme that the present invention solves its technical problem employing is: comprise power circuit, single chip circuit, pwm circuit, DC fan, power circuit provides power supply for single chip circuit, DC fan, the input end of pwm circuit is electrically connected with single chip circuit PWM mouth, also comprise the DAC circuit being electrically connected with power circuit, the output terminal of pwm circuit is electrically connected with the voltage input of DC fan by DAC circuit.
Also comprise voltage sample circuit, the input end of voltage sample circuit is electrically connected with the output terminal of DAC circuit, output terminal is electrically connected with the input end of single chip circuit.
Also comprise rotating speed sample circuit, the input end of rotating speed sample circuit is electrically connected with DC fan output terminal, and the output terminal of rotating speed sample circuit is electrically connected with the input of single chip circuit.
Also comprise current sampling circuit, linear amplification and eliminator, the input end of current sampling circuit is electrically connected with DC fan output terminal, linear amplification and the input end of eliminator and the output terminal of current sampling circuit is electrically connected, output terminal is electrically connected with the input end of single chip circuit.
Described power circuit is switch power or power frequency supply, and output voltage is safety voltage.
Described single chip circuit has AD sampling functions and PWM pulse-width regulated function, and single-chip microcomputer is PIC16 series or MEGA16 series.
The driver frequency of described pwm circuit is 1-20Khz, and adjusting pulsewidth width is 0%-100%.
Described DAC circuit is second-order low-pass filter circuit, and adjusting analog voltage range is 1-24V.
Operational amplifier in described linearity amplification and eliminator is LM358 series.
The utility model is compared produced beneficial effect with background technique: comprise power circuit because the utility model adopts, single chip circuit, pwm circuit, DC fan, power circuit is single chip circuit, DC fan provides power supply, the input end of pwm circuit is electrically connected with single chip circuit PWM mouth, also comprise the DAC circuit being electrically connected with power circuit, the scheme that the output terminal of pwm circuit is electrically connected with the voltage input of DC fan by DAC circuit, adopt analog voltage speed governing, owing to having saved in existing principal voltage amplitude modulation mode of speed regulation switching tube in closed loop BUCK ON-OFF control circuit, the components and parts such as energy storage power inductance, make control circuit simple in structure, circuit board size is little, control cost low, reliability is strong.
Brief description of the drawings
Fig. 1 is control block diagram of the present utility model;
Fig. 2 is circuit connection diagram of the present utility model.
Embodiment
Referring to accompanying drawing 1, accompanying drawing 2, the present embodiment comprises power circuit 1, single chip circuit 2, pwm circuit 3, DC fan 9, power circuit provides power supply for single chip circuit 2, DC fan 9, the input end of pwm circuit 3 is electrically connected with the PWM mouth of single chip circuit 2, also comprise the DAC circuit 4 being electrically connected with power circuit 1, the output terminal of pwm circuit 3 is electrically connected with the voltage input of DC fan 9 by DAC circuit 4.Single chip circuit 2 sends pwm signal by PWM mouth, and the digital signal that DAC circuit 4 is exported pwm circuit 3 is converted to the analog voltage that DC fan 9 needs, and then by the rotating speed of analog voltage control DC fan 9, adopts analog voltage modulation.Because existing DC fan control gear generally adopts principal voltage amplitude modulation speed governing, wherein switching tube is large electric current PNP power tube or P type field effect transistor, controls cost higher, and the performance of batch property is difficult to ensure conformity; Energy storage power inductance is easily subject to the impact of magnetic material, and whole DC fan control circuit exists risk.More just because of power component, cause control circuit complex structure, circuit board size is large, the height of controlling cost, poor reliability.The application has saved large electric current PNP power tube or P type field effect transistor and energy storage power inductance constant power element, and circuit is simple, and circuit board size is little, controls cost low, and reliability is strong.
It also comprises voltage sample circuit 5, and the input end of voltage sample circuit 5 is electrically connected with the output terminal of DAC circuit 4, output terminal is electrically connected with the input end of single-chip microcomputer electric current 2, forms a loop.Single chip circuit 2 can be preset the input voltage value of a DC fan, voltage sample circuit 5 can be used as feeder loop and will feed back to single chip circuit 2 through the real-time voltage of DAC circuit 4 input direct-current blower fans 9, single chip circuit is by comparing predefined value and actual value, can change the pwm signal of output, make the stabilized input voltage of DC fan 9 at predefined value, thereby modulate the rotating speed of DC fan 9 by analog voltage.
It also comprises rotating speed sample circuit 6, and the input end of rotating speed sample circuit 6 is electrically connected with DC fan 9 output terminals, and the output terminal of rotating speed sample circuit 6 is electrically connected with the input of single chip circuit 2.Single chip circuit 2 can be preset a tachometer value, rotating speed sample circuit 6 can be used as feeder loop by speed feedback real-time DC fan 9 to single chip circuit 2, single chip circuit is by comparing predefined value and actual value, can change the pwm signal of output, make the stabilization of speed of DC fan 9 at predefined value.
It also comprises current sampling circuit 7, linear amplification and eliminator 8, the input end of current sampling circuit 7 is electrically connected with DC fan 9 output terminals, the input end of linear amplification and eliminator 8 is electrically connected with the output terminal of current sampling circuit 7, and output terminal is electrically connected with the input end of single chip circuit 2.Function with speed feedback circuit is above the same, current sampling circuit 7 is also, as feedback signal, the real-time current of DC fan 9 is sent to single chip circuit 2, and what single chip circuit 2 can be according to predetermined current value and actual current value relatively adjusts actual output signal.Certainly, if in Voltage Feedback, in conjunction with speed feedback and/or currrent feedback, the feedback signal that single chip circuit 2 obtains can be more accurate, and more convenient its regulates actual PWM output, DC fan 9 moved more stable.Even if the utility model comprises this 3 feedback signal circuits, control cost also lower than existing principal voltage amplitude modulation speed-regulating controling mode.
Further, described power circuit 1 is switch power or power frequency supply, and output voltage is safety voltage, as 12V, 24V, 36v, ensures the Electrical Safety of each circuit.
Preferably, described single chip circuit 2 has AD sampling functions and PWM pulse-width regulated function, and single-chip microcomputer is PIC16 series or MEGA16 series.
The driver frequency of described pwm circuit 3 is 1-20Khz, and adjusting pulsewidth width is 0%-100%, and when pulsewidth is 0%, DC fan 9 shuts down, and when pulsewidth is 100%, blower fan is with maximum power operation.
Preferably, described DAC circuit 4 is second-order low-pass filter circuit, and adjusting analog voltage range is 1-24V.
As shown in Figure 2, the operational amplifier in linear amplification and eliminator 8 has enlarging function, the optional LM358 of operational amplifier U1, U2.In current sampling circuit 7, the resistance of sample-power resistance R 18 is less than or equal to 3 Ω, can be 1 Ω, 2 Ω, 3 Ω.
Described DC fan 9 is single-phase or multiphase DC blower fan.
Claims (10)
1. a DC fan control gear, comprise power circuit (1), single chip circuit (2), pwm circuit (3), DC fan (9), power circuit is that single chip circuit (2), DC fan (9) provide power supply, the input end of pwm circuit (3) is electrically connected with single chip circuit (2) PWM mouth, characterized by further comprising the DAC circuit (4) being electrically connected with power circuit (1), the output terminal of pwm circuit (3) is electrically connected with the voltage input of DC fan (9) by DAC circuit (4).
2. DC fan control gear according to claim 1, characterized by further comprising voltage sample circuit (5), the input end of voltage sample circuit (5) is electrically connected with the output terminal of DAC circuit (4), output terminal is electrically connected with the input end of single chip circuit (2).
3. DC fan control gear according to claim 1 and 2, characterized by further comprising rotating speed sample circuit (6), the input end of rotating speed sample circuit (6) is electrically connected with DC fan (9) output terminal, and the output terminal of rotating speed sample circuit (6) is electrically connected with the input of single chip circuit (2).
4. DC fan control gear according to claim 1 and 2, characterized by further comprising current sampling circuit (7), linear amplification and eliminator (8), the input end of current sampling circuit (7) is electrically connected with DC fan (9) output terminal, and the input end of linear amplification and eliminator (8) is electrically connected with the output terminal of current sampling circuit (7), output terminal is electrically connected with the input end of single chip circuit (2).
5. DC fan control gear according to claim 3, characterized by further comprising current sampling circuit (7), linear amplification and eliminator (8), the input end of current sampling circuit (7) is electrically connected with DC fan (9) output terminal, and the input end of linear amplification and eliminator (8) is electrically connected with the output terminal of current sampling circuit (7), output terminal is electrically connected with the input end of single chip circuit (2).
6. DC fan control gear according to claim 1, is characterized in that described power circuit (1) is switch power or power frequency supply, and output voltage is safety voltage.
7. DC fan control gear according to claim 1, is characterized in that described single chip circuit (2) has AD sampling functions and PWM pulse-width regulated function, and single-chip microcomputer is PIC16 series or MEGA16 series.
8. DC fan control gear according to claim 1, is characterized in that the driver frequency of described pwm circuit (3) is 1-20Khz, and adjusting pulsewidth width is 0%-100%.
9. DC fan control gear according to claim 1, is characterized in that described DAC circuit (4) is second-order low-pass filter circuit, and adjusting analog voltage range is 1-24V.
10. DC fan control gear according to claim 4, is characterized in that the operational amplifier in described linearity amplification and eliminator (8) is LM358 series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420151491.5U CN203926088U (en) | 2014-04-01 | 2014-04-01 | DC fan control gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420151491.5U CN203926088U (en) | 2014-04-01 | 2014-04-01 | DC fan control gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203926088U true CN203926088U (en) | 2014-11-05 |
Family
ID=51821907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420151491.5U Expired - Lifetime CN203926088U (en) | 2014-04-01 | 2014-04-01 | DC fan control gear |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203926088U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018205909A1 (en) * | 2017-05-09 | 2018-11-15 | 广州市浩洋电子股份有限公司 | Fan rotation speed control system |
-
2014
- 2014-04-01 CN CN201420151491.5U patent/CN203926088U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018205909A1 (en) * | 2017-05-09 | 2018-11-15 | 广州市浩洋电子股份有限公司 | Fan rotation speed control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170419 Address after: 528325 Guangdong Province, Foshan city Shunde District Xingtan town De Fu Road No. 71 Patentee after: GUANGDONG WANHE THERMAL ENERGY TECHNOLOGY Co.,Ltd. Address before: 528305 Foshan, Shunde District, Ronggui street, Hongqi Road, No. 80 Patentee before: FOSHAN SHUNDE VANWARD ACCESSORIES CO.,LTD. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141105 |