CN100424982C - Radiating fan pulse width modulating-conversion control system - Google Patents
Radiating fan pulse width modulating-conversion control system Download PDFInfo
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- CN100424982C CN100424982C CNB031531083A CN03153108A CN100424982C CN 100424982 C CN100424982 C CN 100424982C CN B031531083 A CNB031531083 A CN B031531083A CN 03153108 A CN03153108 A CN 03153108A CN 100424982 C CN100424982 C CN 100424982C
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Abstract
The present invention relates to a pulse width modulation switching control system for a radiator fan, which comprises a pulse width modulating signal input terminal, a converting unit and a driving circuit, wherein pulse width modulating signals are input from the pulse width modulating signal input terminal, and the converting unit receives different pulse width modulating signals, converts the pulse width modulating signals into analog voltage signals with different electric levels according to the duty cycles of the pulse width modulating signals, and then transmits the analog voltage signals to the driving circuit to make the driving circuit control the rotary speed of a fan motor according to the different electric levels of the analog voltage signals.
Description
Technical field
The present invention relates to a kind of pulse-width modulation switching control system of radiator fan, become analog voltage signal with control fan motor rotating speed pulse width modulated signal conversion.
Background technology
The rotation of general traditional pulse-width signal control radiator fan is an ON time of utilizing the coil windings in the pulse-width signal control radiator fan motor, reach the control purpose of different rotating speeds according to different duty (DUTY CYCLE), but utilize pulse-width signal directly to control the rotating speed that its amplitude of rotation speed of the fan, frequency and duty ratio variablees such as (DUTY CYCLE) all can influence fan motor.
Fig. 1 shows a kind of traditional circuit; as shown in the figure; include the contrary protection diode 101 of pressing; Hall subassembly 102; driven unit 103; the first transistor 104; transistor seconds 105; first resistance 106; second resistance 107; the 3rd resistance 108 and the first motor winding 109; the second motor winding 120; the 4th resistance 121; the 5th resistance 122 and the 3rd transistor 123; the 4th transistor 124, this Hall subassembly 102; driven unit 103; the first transistor 104; transistor seconds 105; first resistance 106; second resistance 107; the 3rd resistance 108 and the first motor winding 109; the second motor winding 120 is formed drive circuit 10.
When power turn-on after by after adding to circuit against pressure protection diode 101; the pole change of Hall subassembly 102 detection rotors of drive circuit 10 produces positive voltage H+ and negative voltage H-exports driven unit 103 to; convert aforesaid voltage to the control signal source via driven unit 103 and export the first transistor 104 and transistor seconds 105 to through the first output OUT1 and the second output OUT2; one pulse-width signal input PWM is through the collection utmost point of the 4th resistance 121 the 5th resistance 122 and the 3rd transistor 123 the 4th transistor 124; cut off first output OUT1 of driven unit 103 and the control signal source of the second output OUT2; with first motor winding 109 and the second motor winding 120 of control connection in the collection utmost point of the first transistor 104 and transistor seconds 105, and then the rotation speed change of control fan motor.
Fig. 2 shows second kind of traditional circuit; include the contrary protection diode 201 of pressing; Hall subassembly 202; driven unit 203; the first transistor 204; transistor seconds 205; first resistance 206; second resistance 207; the 3rd resistance 208 and the first motor winding 209; the second motor winding 220; the 4th resistance 221; and the 3rd transistor 222; this Hall subassembly 202 wherein; driven unit 203; the first transistor 204; transistor seconds 205; first resistance 206; second resistance 207; the 3rd resistance 208 and the first motor winding 209; the second motor winding 220 is to form drive circuit 20; one pulse-width signal input PWM connects the control input end ST of driven unit 203 through the 4th resistance 221 and the 3rd transistor 222; by the pulse-width signal cyclic variation; duty ratio (DUTY CYCLE) control Driver Circuit 20 that changes the arteries and veins modulation signal produces the switch start time; to control the first motor winding 218; the power of the second motor winding 219, and then the rotation speed change of control fan motor.
Fig. 3 shows the third traditional circuit; as shown in the figure; the one contrary protection diode 301 of pressing; Hall subassembly 302; driven unit 303; the first transistor 304; transistor seconds 305; first resistance 306; second resistance 307; the 3rd resistance 308 and the first motor winding 309; the second motor winding 320 is formed drive circuit 30; one pulse-width signal input PWM is through the Kai Heguan of the 4th resistance 321 and the 3rd transistor 322 control input power supplys, makes the first motor winding 309 that is connected in the first transistor 304 and the transistor seconds 305 collection utmost points and the second motor winding 320 drives and then the rotating speed of control fan motor.
Above-mentionedly utilize pulse-width signal directly to control fan motor following shortcoming is arranged:
1. pulse-width signal frequency variation scope is excessive, causes the momentary speed variation of fan motor to neglect big or suddenly little along with the change of frequency;
2. the fixed duty cycle of pulse-width signal (DUTY CYCLE) is not easy to reach the tachometer value and the change in rotational speed scope of the fan motor that institute's desire sets;
3. (being lower than 20KHZ) can produce electric noise during the pulse-width signal underfrequency.
Summary of the invention
The pulse-width modulation switching control system that the purpose of this invention is to provide a kind of radiator fan, its converting unit produces analog voltage signal control fan motor rotating speed according to the duty ratio of the pulse-width signal of input.
Wherein, the analog voltage signal after conversion is by the resistance allotment of converting unit, and the high and low level of setting the output analog voltage signal is to adjust the high and low rotating speed of fan motor.
Wherein, with the resistance value allotment of the analog voltage signal after the conversion, set the control range of variable quantity to increase or to dwindle pulse-width modulation of analog voltage signal via converting unit.
Wherein, pulse width modulated signal conversion is become analog voltage signal, reduce the electric noise that causes when frequency variation that pulse-width signal produces causes the rotating speed skew of fan motor and low frequency.
The pulse-width modulation switching control system of radiator fan of the present invention is applied to fan motor, and it comprises:
One pulse-width modulation input is for the pulse-width signal input;
One converting unit connects the pulse-width modulation input, and becomes the analog voltage signal of varying level according to the duty cycle conversion of pulse-width signal;
One drive circuit is according to the rotating speed of the analog voltage signal of varying level control fan motor;
Wherein, converting unit becomes the analog voltage signal of varying level according to the duty cycle conversion of distinct pulse widths modulation signal, makes drive circuit control the fan motor rotating speed according to the analog voltage signal of converting unit output varying level;
Wherein, described converting unit comprises:
According to the variable bleeder circuit of the pulse-width signal change voltage ratio of importing, to obtain voltage signal corresponding to pwm signal waveform;
Smmothing capacitor, the voltage signal that described variable bleeder circuit is exported converts its level and the corresponding smooth voltage signal of described duty ratio to; Wherein, described variable bleeder circuit according to the pulse-width signal change voltage ratio of importing comprises:
The first transistor, according to the input the pulse-width signal conducting or end;
The fixed partial pressure circuit that constitutes by the series connection of first resistance and second resistance;
The 3rd resistance, the 3rd resistance string are connected on the first transistor collection-penetrate on the passage, when the first transistor conducting with described second resistance form in parallel, thereby change the voltage ratio of variable bleeder circuit.
With instantiation characteristic on above-mentioned purpose of the present invention and structure and the function is described below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is first kind of traditional circuit schematic diagram;
Fig. 2 is second kind of traditional circuit schematic diagram;
Fig. 3 is the third traditional circuit schematic diagram;
Fig. 4 is the circuit diagram of preferred embodiment of the present invention;
Fig. 5 a is a pulse-width signal input oscillogram of the present invention;
Fig. 5 b is the waveform of pulse-width signal of the present invention after the analog circuit conversion;
Fig. 5 c is the signal waveform of the present invention through changing produces DC level through electric capacity a waveform;
Fig. 6 is the distinct pulse widths modulation signal converts analog voltage signal to through analog circuit the output voltage table of comparisons.
Description of reference numerals: 10 drive circuits; The 101 contrary protection diodes of pressing; 102 Hall subassemblies; 103 driven units; 104 the first transistors; 105 transistor secondses; 106 first resistance; 107 second resistance; 108 the 3rd resistance; 109 first motor windings; 120 second motor windings; 121 the 4th resistance; 122 the 5th resistance; 123 the 3rd transistors; 124 the 4th transistors; 20 drive circuits; The 201 contrary protection diodes of pressing; 202 Hall subassemblies; 203 driven units; 204 the first transistors; 205 transistor secondses; 206 first resistance; 207 second resistance; 208 the 3rd resistance; 209 first motor windings; 220 second motor windings; 221 the 4th resistance; 222 the 3rd transistors; 30 drive circuits; The 301 contrary protection diodes of pressing; 302 Hall subassemblies; 303 driven units; 304 the first transistors; 305 transistor secondses; 306 first resistance; 307 second resistance; 308 the 3rd resistance; 309 first motor windings; 320 second motor windings; 321 the 4th resistance; 322 the 3rd transistors; 40 drive circuits; The 401 contrary protection diodes of pressing; 402 Hall subassemblies; 403 driven units; 404 transistor secondses; 405 the 3rd transistors; 409 first motor windings; 420 second motor windings; 421 second electric capacity; 426 first electric capacity; 427 the first transistors; R1 first resistance; R2 second resistance; R3 the 3rd resistance; R4 the 4th resistance; R5 the 5th resistance; R6 the 6th resistance; R7 the 7th resistance; OUT1 first output; OUT2 second output; The ST control output end; PWM pulsewidth FM signal input; The H+ positive voltage; The H-negative voltage.
Embodiment
The present invention is a kind of pulse-width modulation switching control system of radiator fan; see also preferred embodiment of the present invention shown in Figure 4; as shown in the figure; the present invention includes the contrary protection diode 401 of pressing; Hall subassembly 402; driven unit 403; transistor seconds 404; the 3rd transistor 405; the 5th resistance R 5; the 6th resistance R 6; the 7th resistance R 7 and the first motor winding 409; the second motor winding 420; second electric capacity 421; the 4th resistance R 4; the 3rd resistance R 3; first resistance R 1; second resistance R 2; first electric capacity 426; the first transistor 427; this Hall subassembly 402 wherein; driven unit 403; transistor seconds 404; the 3rd transistor 405; the 5th resistance R 5; the 6th resistance R 6; the 7th resistance R 7 and the first motor winding 409; the second motor winding 420; second electric capacity 421 is formed drive circuit 40; when power turn-on after by after adding to circuit against pressure protection diode 401; the pole change of Hall subassembly 402 detection rotors of drive circuit 40 produces positive voltage H+ and negative voltage H-and exports driven unit 403 to.
One pulse-width modulation input PWM connects a converting unit, wherein this converting unit is an analog circuit 41, and this analog circuit 41 is made up of the 4th resistance R 4, the 3rd resistance R 3, first resistance R 1, second resistance R 2, first electric capacity 426, the first transistor 427, this pulse-width signal converts an analog voltage signal to through analog circuit 41 and exports driven unit 403 to and be connected in the first motor winding 409 and the second motor winding 420 of the transistor seconds 404 and the 3rd transistor 405 collection utmost points and then the rotating speed of control fan motor with driving.
Please consult Fig. 4 again, Fig. 5 a, Fig. 5 b, Fig. 5 c, when pulse-width signal process analog circuit 41, convert the analog voltage signal of varying level to according to the duty ratio (DUTY CYCLE) of the pulse-width signal of importing (shown in Fig. 5 a), and can be via the 3rd resistance R 3 of analog circuit 41, first resistance R 1, behind the high level and low level of the analog voltage signal of the allotment setting output of second resistance R 2 (shown in Fig. 5 b), produce high again through 426 filtering of first electric capacity, low DC level voltage (shown in Fig. 5 c), and then the height of setting fan motor, the slow-speed of revolution, can further adjust simultaneously the variable quantity that increases or dwindle analog voltage signal, and then the control range of the pulse-width signal of influence input.
Fig. 4, Fig. 6 is that the pulse-width signal of application different frequency of the present invention is exported the analog voltage signal tables of comparisons through analog circuit 41 conversion backs, wherein, the input power supply is that the resistance value of first resistance R 1 of 5V and its analog circuit 41 is 5.1k Ω, the resistance value of second resistance R 2 is 12k Ω, the resistance value of the 3rd resistance R 3 is 1.2k Ω, as three kinds of different frequency 25KHZ, 1KHZ, the pulse-width signal of 100KHZ is after process first resistance R, 1 second resistance R 2 the 3rd resistance R 3 of analog circuit 41, at its output analog voltage signal height of different duty ratio (DUTY CYCLE), low level value is approaching, again by the analog voltage signal control fan motor rotating speed of output, significantly reduce the error that the frequency variation of pulse-width signal causes and produce the phenomenon of fan motor rotating speed skew.
In sum, the pulse-width modulation switching control system of radiator fan of the present invention has the following advantage:
1. the analog voltage signal of exporting through analog circuit 41 conversion back, significantly reduce the error that the frequency variation because of pulse-width signal causes and produce the skew of fan motor rotating speed, be pulse-width signal when control fan motor rotating speed, the variable effect of duty ratio (DUTY CYCLE) that is subjected to pulse-width signal is bigger;
2. the analog voltage signal after conversion can be set the high and low level of output analog voltage signal via the allotment of first resistance R 1 of analog circuit 41, second resistance R 2, the 3rd resistance R 3, and then sets the maximum speed and the minimum speed of fan motor easily;
3. the analog voltage signal after conversion can be via the allotment of first resistance R 1 of analog circuit 41, second resistance R 2, the 3rd resistance R 3, set the high and low level of output analog voltage signal, to adjust the variable quantity that increases or dwindle the analog voltage signal of output, and when the variable quantity of analog voltage signal increases or dwindles, the control range that can increase or dwindle the pulse-width signal of input;
4. pulse-width signal becomes a class voltage signal after changing, and has improved the bad variable in the pulse-width signal for a long time, the electric noise that produces when causing the rotating speed skew of fan motor and low frequency as frequency variation.
The above only is preferable feasible embodiment of the present invention, and the variation that above-mentioned method, shape, structure, the device of all the present invention of utilization done all should fall into protection scope of the present invention.
Claims (3)
1. the pulse-width modulation switching control system of a radiator fan is applied to fan motor, it is characterized in that comprising:
One pulse-width modulation input is for the pulse-width signal input;
One converting unit connects the pulse-width modulation input, and becomes the analog voltage signal of varying level according to the duty cycle conversion of pulse-width signal;
One drive circuit is according to the rotating speed of the analog voltage signal of varying level control fan motor;
Wherein, converting unit becomes the analog voltage signal of varying level according to the duty cycle conversion of distinct pulse widths modulation signal, makes drive circuit control the fan motor rotating speed according to the analog voltage signal of converting unit output varying level;
Wherein, described converting unit comprises:
According to the variable bleeder circuit of the pulse-width signal change voltage ratio of importing, to obtain voltage signal corresponding to pwm signal waveform;
Smmothing capacitor, the voltage signal that described variable bleeder circuit is exported converts its level and the corresponding smooth voltage signal of described duty ratio to; Wherein, described variable bleeder circuit according to the pulse-width signal change voltage ratio of importing comprises:
The first transistor, according to the input the pulse-width signal conducting or end;
The fixed partial pressure circuit that constitutes by the series connection of first resistance and second resistance;
The 3rd resistance, the 3rd resistance string are connected on the first transistor collection-penetrate on the passage, when the first transistor conducting with described second resistance form in parallel, thereby change the voltage ratio of variable bleeder circuit.
2. the pulse-width modulation switching control system of radiator fan as claimed in claim 1, wherein said smmothing capacitor is in parallel with described second resistance.
3. the pulse-width modulation switching control system of radiator fan as claimed in claim 1, wherein said drive circuit includes a Hall subassembly, a driven unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031531083A CN100424982C (en) | 2003-08-07 | 2003-08-07 | Radiating fan pulse width modulating-conversion control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031531083A CN100424982C (en) | 2003-08-07 | 2003-08-07 | Radiating fan pulse width modulating-conversion control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1581671A CN1581671A (en) | 2005-02-16 |
| CN100424982C true CN100424982C (en) | 2008-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB031531083A Expired - Fee Related CN100424982C (en) | 2003-08-07 | 2003-08-07 | Radiating fan pulse width modulating-conversion control system |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102155424B (en) * | 2011-04-14 | 2012-05-30 | 江苏浩峰汽车附件有限公司 | PWM (Pulse Wavelength Modulation) speed regulating module for cooling fan of automobile engine |
| CN104378046B (en) | 2013-08-16 | 2017-09-19 | 台达电子工业股份有限公司 | motor control system and method |
| JP6372981B2 (en) * | 2013-08-23 | 2018-08-15 | 日本電産サーボ株式会社 | Motor drive device |
| TWI660126B (en) * | 2018-01-16 | 2019-05-21 | 陞達科技股份有限公司 | System and method for controlling fan |
| CN110043496B (en) * | 2018-01-16 | 2020-08-21 | 陞达科技股份有限公司 | Fan control system and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6208280B1 (en) * | 1999-01-11 | 2001-03-27 | Seagate Technology Llc | Converting a pulse-width modulation signal to an analog voltage |
| JP2001112279A (en) * | 1999-10-06 | 2001-04-20 | Matsushita Electric Ind Co Ltd | Electronic controller for air conditioner |
| CN2662531Y (en) * | 2003-07-31 | 2004-12-08 | 台达电子工业股份有限公司 | Rotary speed control circuit for fan motor |
-
2003
- 2003-08-07 CN CNB031531083A patent/CN100424982C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6208280B1 (en) * | 1999-01-11 | 2001-03-27 | Seagate Technology Llc | Converting a pulse-width modulation signal to an analog voltage |
| JP2001112279A (en) * | 1999-10-06 | 2001-04-20 | Matsushita Electric Ind Co Ltd | Electronic controller for air conditioner |
| CN2662531Y (en) * | 2003-07-31 | 2004-12-08 | 台达电子工业股份有限公司 | Rotary speed control circuit for fan motor |
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| CN1581671A (en) | 2005-02-16 |
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Granted publication date: 20081008 Termination date: 20120807 |