CN101603543B - Method for setting rotating speed of fan by utilizing RC frequency - Google Patents
Method for setting rotating speed of fan by utilizing RC frequency Download PDFInfo
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- CN101603543B CN101603543B CN2008101115990A CN200810111599A CN101603543B CN 101603543 B CN101603543 B CN 101603543B CN 2008101115990 A CN2008101115990 A CN 2008101115990A CN 200810111599 A CN200810111599 A CN 200810111599A CN 101603543 B CN101603543 B CN 101603543B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
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- 229910052799 carbon Inorganic materials 0.000 claims description 2
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Abstract
The invention provides a method for setting the rotating speed of a fan by utilizing RC frequency. A control chip sets the frequency range by utilizing at least one oscillator which is provided with at least one resistance element and at least one capacitance element. When the rotating speed of the fan is set, the resistance element and the capacitance element set the frequency and generate a pulse signal, a clock pulse generator converts the pulse signal into a square wave signal, a pulse sampler receives the square wave signal and judges whether the frequency of the square wave signal is lower than that of the control chip or not, if so, the pulse sampler receives a pulse signal which is generated by a frequency doubling signal generated by a high-speed clock device after doubling the frequency of the square wave signal, a multiplying unit receives the pulse signal to be converted into the frequency set by the rotating speed and generates a control signal, and a control unit controls the operation of the fan according to the control signal so as to achieve the purpose of setting the rotating speed of the fan.
Description
Technical field
The present invention relates to a kind of method of setting rotating speed of fan, relate in particular to the method for utilizing RC frequency setting rotation speed of the fan that a kind of control chip utilizes the scope of at least one oscillator setpoint frequency.
Background technique
Information of Science and Technology progress with rapid changepl. never-ending changes and improvements now, electronic equipment (as: computer) is endowed more function to promote use value, and because the function that increases, making needs to increase more multicomponent or part in the system of a constant volume, and described element or part not only can increase density in system, heat density is promoted, therefore, need to use sink help its heat radiation, and generally the most normal use be first-selected with the fan.
The method of existing fan control chip (Integrated Circut is called for short IC) rotating speed, it comprises the following steps:
In control chip, preestablish the scope of rotating speed;
By a resistor voltage divider circuit setting voltage of outside, and produce a voltage signal and be sent to described control chip;
Described control chip is according to described voltage signal control fan running.
In sum, when adjusting rotation speed of the fan, need in control chip, to set earlier the scope of rotating speed, and come setting voltage by the resistor voltage divider circuit of outside, and produce a voltage signal and send described control chip to, make described control chip control fan running, can reach the purpose of setting rotating speed of fan according to voltage signal; Wherein the voltage range of control chip has certain restriction, for example: if the rotating speed height when voltage is 1.4 volts, then the rotating speed during 3 volts of voltages is low, and 1.6 volts of described both voltage phase difference, if be 1.4 volt with voltage this moment is to be divided into 128 rank between 3 volts to voltage, voltage phase difference 12.5 millivolts on each rank, just equal 1.6 volts by calculating 128 factorials in 12.5 millivolts, therefore must be divided into many stratum through described getting in the voltage range, and voltage range is too small is interfered easily, and voltage range is immutable big, so that cause many restrictions.
Yet the method for existing fan control chip rotating speed has three shortcomings of following example:
1. must set the scope of rotating speed in the inner elder generation of control chip, and cannot arbitrarily adjust, cause in the operation to be restricted.
2. voltage range is too small is interfered easily.
3. speed range also is restricted.
Summary of the invention
Main purpose of the present invention is to provide a kind of method of the RC of utilization frequency setting rotation speed of the fan, and it utilizes the scope of at least one oscillator setpoint frequency, with setting rotating speed of fan.
For reaching described purpose, the invention provides a kind of method of the RC of utilization frequency setting rotation speed of the fan, utilize the scope of at least one oscillator setpoint frequency by a control chip, described oscillator is provided with at least one resistor and at least one capacitor, said method comprising the steps of:
Described resistor and described capacitor are set a frequency, and produce a pulse signal;
Convert described pulse signal to a square signal by a clock pulse generator;
One pulsating sampler receives described square signal, and judges whether the frequency of described square signal is lower than the frequency of described control chip; When the frequency of described square signal is lower than the frequency of described control chip, after the frequency-doubled signal that described pulsating sampler reception is produced by a high-frequency clock device is done the frequency multiplication calculation process to described square signal, produces a pulse signal and be sent to a multiplier; Otherwise described pulsating sampler is sent to a multiplier with described square signal;
Described multiplier is scaled the frequency of speed setting with described pulse signal, and produces a control signal and be sent to a control unit;
Described control unit is according to described control signal control fan running.
Compared with prior art, the method for utilizing RC frequency setting rotation speed of the fan provided by the invention has following three advantages:
1. the speed range of utilizing described oscillator to set is wider, and also can arbitrarily adjust.
2. the interference resistant ability that described oscillator has is strong.
3. the rotation speed of the fan of She Dinging can utilize formula to calculate and get, but design processes simplified.
Reference character
Fig. 1 be the preferred embodiment of the present invention based on the circuit box schematic representation of system;
Fig. 2 is the main schematic flow sheet of the described method of the preferred embodiment of the present invention;
Fig. 3 be the embodiment of the invention based on system the application circuit schematic representation;
Fig. 4 a is the wavy curve figure of the system frequency of the present invention's one application example;
Fig. 4 b is the slow wavy curve figure of the frequency of the present invention's one application example;
Fig. 4 c is the wavy curve figure of frequency of the speed setting of the present invention's one application example;
Fig. 4 d is the curve synoptic diagram of the revolution speed calculating of the present invention's one application example;
Fig. 5 a is the wavy curve figure of the system frequency of Another Application example of the present invention;
Fig. 5 b is the fast wavy curve figure of the frequency of Another Application example of the present invention;
Fig. 5 c is the wavy curve figure of frequency of the speed setting of Another Application example of the present invention;
Fig. 5 d is the curve synoptic diagram of the revolution speed calculating of Another Application example of the present invention.
Description of reference numerals: control chip-1; Driver element-60; Oscillator-10; Control unit-70; Speed setting unit-20; Resistive element-R; Clock pulse generator-210; Capacity cell-C; Pulsating sampler-220; Reference voltage-Vref; Multiplier-230; Grounding end-GND; High-frequency clock device-30; First and second end-H+, H-; Input signal detection unit-40; Third and fourth end-OUT1, OUT2; Hall detection unit-50; Input end-INPUT.
Embodiment
As shown in Figure 1 and Figure 2, among the figure the preferred embodiments of the present invention, the invention provides a kind of method of the RC of utilization frequency setting rotation speed of the fan, outside a control chip 1, couple at least one oscillator 10, and utilize the scope of described oscillator 10 setpoint frequencies, described oscillator 10 has the strong function of interference resistant ability, and described oscillator 10 comprises at least one resistive element R and at least one capacity cell C.
As shown in Figure 1, the end of described resistive element R is coupled to a reference voltage Vref (or being called the desired value reference potential), its the other end couples mutually with the end of described capacity cell C, the described capacity cell C the other end and a grounding end GND couple, and described resistive element R and described capacity cell C form the RC oscillating circuit; Described resistive element R can be wire-wound resistor, metal film resister, alloy film resistance, oxidized metal mould resistor, fixed carbon resister, solid carbonaceous resistance or cement resistor; Described capacity cell C can be ceramic condenser, electrochemical capacitor or tantalum electric capacity.
Described control chip 1 comprises speed setting unit 20, control unit (control unit) 70 and high-frequency clock device 30;
Described speed setting unit 20 comprises clock pulse generator 210, pulsating sampler 220 and multiplier 230;
Described clock pulse generator 210, be coupled to the connecting part of the other end and described capacity cell C one end of described resistive element R, described pulsating sampler 220 couples with described clock pulse generator 210, described high-frequency clock device 30 and described multiplier 230 respectively, and described multiplier 230 couples with described control unit 70.
Described clock pulse generator 210 is used for the pulse signal that the described resistive element R that will receive and capacity cell C produce and is converted to described square signal;
Described pulsating sampler 220 is used to receive from the square signal of described clock pulse generator 210 with from the frequency-doubled signal of described high-frequency clock device 30, and judges whether the frequency of described square signal is lower than the frequency of described control chip 1;
Described multiplier 230 is used to receive described control signal or another control signal.
As shown in Figure 2, the described method of the preferred embodiment of the present invention comprises the following steps:
Step 200: beginning;
Step 201: determine the capacitance of capacity cell C, change the resistance value of needed resistive element R; , or determine the resistance value of described resistive element R, change the capacitance of needed capacity cell C, finishing frequency setting, and produce a pulse signal;
Described pulse signal can be triangular signal or sawtooth signal, in the preferred embodiment of the present invention, is that triangular signal is the example explanation with described pulse signal;
Step 202: convert described pulse signal to square signal by described clock pulse generator (CLK generator) 210;
Step 203: described pulsating sampler 220 receives described square signal, and judges whether the frequency of described square signal is lower than the frequency of described control chip 1; If continue step 204; Otherwise, continue step 207;
Step 204: described pulsating sampler 220 receives the frequency-doubled signal that is produced by described high-frequency clock device 30, described square signal is carried out the frequency multiplication calculation process after, produce pulse signal, and described pulse signal be sent to a multiplier (multiplier) 230;
Step 205: described multiplier 230 is scaled the frequency of speed setting with described pulse signal, and produces a control signal and be sent to a control unit 70 (control unit);
Step 206: described control unit 70 is according to the running of described control signal control fan (not shown);
Step 207: described pulsating sampler 220 directly is sent to described multiplier 230 with described square signal;
Step 208: described multiplier 230 produces another control signal after the square signal that receives is scaled the frequency of speed setting, and described another control signal is sent to described control unit 70;
Step 209: described control unit 70 is according to described another control signal control fan (not shown) running;
Step 210: finish.
In the above, the described method of utilizing RC frequency setting rotation speed of the fan of the embodiment of the invention is utilized described resistive element R and described capacity cell C, makes the speed range of setting wide and can arbitrarily adjust, and then relevant with resistance when speed setting; When actual the applying of method of the described RC of the utilization frequency setting of embodiment of the invention rotation speed of the fan, described capacity cell C or described resistive element R are determined, the element that is not determined then can be done replacing (plug) on demand, if determine capacity cell C, replaceable (plug) resistive element R; If when determining resistive element R, replaceable (plug) capacity cell C; Therefore can improve the problem that setting speed range of the prior art is restricted and can not adjusts arbitrarily, is interfered easily because voltage range is too small.
See also Fig. 1, Fig. 3, described control chip 1 also comprises an input signal detection unit 40, a Hall detection unit 50 and a driver element 60, with electrically connecting with described high-frequency clock device 30 and described control unit 70, described Hall detection unit 50 and described driver element 60 are coupled to described control unit 70 respectively respectively in described input signal detection unit 40; Described input signal detection unit 40 has an input end INPUT, described input end INPUT is in order to receive pulsewidth modulation (Pulse Width Modulation, hereinafter to be referred as PWM) signal or analogue signal (Analog Signal), and, be sent to described high-frequency clock device 30 and described control unit 70 respectively with described pwm signal or described analogue signal; In the preferred embodiment of the present invention, receive pwm signal explanation expression with described input end INPUT; Described Hall detection unit 50 have one first end H+, the second end H+, a H-, in order to the signal of the fan phase change that receives and detect Hall element (not shown) induction, the signal of doing after will detecting again is sent to described control unit 70; Described driver element 60 has one the 3rd end OUT1, the 4th end OUT1, OUT2, in order to new pwm signal or another the new pwm signal that receives that described control unit 70 transmits, with the running of control fan.
As shown in Figure 3, the embodiment of the invention based on the application circuit of system in, with three oscillators is three explanation expressions, only still, when the actual enforcement of the present invention, be not limited to three oscillators, also can increase the quantity of oscillator, can be four, five, six etc. as the quantity of oscillator according to the scope of speed setting; When rotation speed of the fan carries out setting rotating speed of fan, at first determine the capacitance of capacity cell C, and change the resistance value of needed resistive element R, perhaps, determine the resistance value of resistive element R, and change the capacitance of needed capacity cell C; After the setting of finishing frequency, and generation triangular signal, and described triangular signal is sent to described clock pulse generator 210, described clock pulse generator 210 sends described square signal to described pulsating sampler 220 after converting the triangular signal that receives to described square signal again; When the frequency that determines the described square signal of reception when described pulsating sampler 220 is lower than the frequency of described control chip 1, described pulsating sampler 220 is according to the frequency-doubled signal that receives described high-frequency clock device 30, after described square signal carried out the frequency multiplication calculation process, produce described pulse signal, and described pulse signal is sent to multiplier 20; After making that described multiplier 230 is scaled the frequency of speed setting with the pulse signal that receives, produce described control signal, and described control signal is sent to described control unit 70.
At this moment, described control unit 70 receives the pwm signal of described control signal and 40 transmission of described input signal detection unit respectively, after it sets the adjustment calculation process according to described control signal to described pwm signal, produce described new pwm signal, more described new pwm signal is sent to described driver element 60; Described driver element 60 is according to the running of described new pwm signal control fan, to reach the purpose of the rotating speed of setting fan.
In addition, if described pulsating sampler 220 judges that the frequency of the square signal that receives is equal to or higher than the frequency of described control chip 1, described pulsating sampler 220 directly is sent to described square signal described multiplier 230; Described multiplier 230 produces described another control signal, and described another control signal is sent to described control unit 70 after the square signal that receives is scaled the frequency of speed setting; At this moment, described control unit 70 receives the pwm signal of described another control signal and 40 transmission of described input signal detection unit respectively, it will set the adjustment calculation process to described pwm signal according to described another control signal, produce described another new pwm signal, again described another new pwm signal is sent to described driver element 60, described driver element 60 is according to the running of described another new pwm signal control fan, to reach the purpose of the rotating speed of setting fan.
By described structure, composition design, following the present invention explains as follows for an application example:
If the rotating speed of single-phase 4 utmost point brushless type fans is 3600RPM, its frequency can be learnt according to following formula:
The frequency that calculates as can be known according to the aforementioned calculation formula is 120Hz, if the frequency that calculates is lower than the frequency of the control chip of fan, for example when the frequency of described control chip is assumed to be 200Hz, need to carry out the frequency multiplication calculation process to the frequency 120Hz that calculates, should with in the example with 8 process of frequency multiplication:
120×8＝960Hz
Therefore, after the frequency that obtains after the process of frequency multiplication is 960Hz.
See also Fig. 4 a, Fig. 4 b, Fig. 4 c, Fig. 4 d, plotted curve for an application example of the present invention, if the oscillation frequency that the RC oscillating circuit is produced and the number of comparisons of control chip frequency are 16/28 (as Fig. 4 a, Fig. 4 b, Fig. 4 d), can accurately calculate the frequency (as Fig. 4 c) of speed setting according to described data.
See also Fig. 5 a, Fig. 5 b, Fig. 5 c, Fig. 5 d are the plotted curve of further application of the invention example, if the oscillation frequency that the RC oscillating circuit is produced and the number of comparisons of control chip frequency are 7/28 (as Fig. 5 a, Fig. 5 b, Fig. 5 d), can accurately calculate the frequency (as Fig. 5 c) of speed setting according to described data.
In sum, the method for utilizing the RC frequency to set rotation speed of the fan provided by the invention has lower three advantages:
1. the range of speeds of utilizing described oscillator to set is wider, and also can arbitrarily adjust.
2. the interference resistant ability that has of described oscillator is strong.
3. the rotation speed of the fan of setting can utilize formula to calculate and get, and can simplify design process.
Claims (5)
1. method of utilizing RC frequency setting rotation speed of the fan is utilized the scope of at least one oscillator setpoint frequency by a control chip, and described oscillator is provided with at least one resistor and at least one capacitor, it is characterized in that, said method comprising the steps of:
Described resistor and described capacitor are set a frequency, and produce a pulse signal;
Convert described pulse signal to a square signal by a clock pulse generator; One pulsating sampler receives described square signal, and judges whether the frequency of described square signal is lower than the frequency of described control chip; When the frequency of described square signal is lower than the frequency of described control chip, after the frequency-doubled signal that described pulsating sampler reception is produced by a high-frequency clock device is done the frequency multiplication calculation process to described square signal, produce a pulse signal and be sent to a multiplier, described multiplier is scaled the frequency of speed setting with this pulse signal, and produces a control signal and be sent to a control unit;
When the frequency of described square signal is equal to or higher than the frequency of described control chip, described pulsating sampler is sent to this multiplier with described square signal, described multiplier is scaled the frequency of speed setting with this square signal, and produces another control signal and be sent to described control unit;
Described control unit is according to described control signal or described another control signal control fan running.
2. the method for utilizing RC frequency setting rotation speed of the fan as claimed in claim 1 is characterized in that described pulse signal is a triangular signal.
3. the method for utilizing RC frequency setting rotation speed of the fan as claimed in claim 1 is characterized in that described pulse signal is a sawtooth signal.
4. the method for utilizing RC frequency setting rotation speed of the fan as claimed in claim 1 is characterized in that, described resistor is wire-wound resistor, metal film resister, alloy film resistance, oxidized metal mould resistor, fixed carbon resister, solid carbonaceous resistance or cement resistor.
5. the method for utilizing RC frequency setting rotation speed of the fan as claimed in claim 1 is characterized in that, described capacitor is ceramic condenser, electrochemical capacitor or tantalum electric capacity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101115990A CN101603543B (en) | 2008-06-10 | 2008-06-10 | Method for setting rotating speed of fan by utilizing RC frequency |
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| CN2008101115990A CN101603543B (en) | 2008-06-10 | 2008-06-10 | Method for setting rotating speed of fan by utilizing RC frequency |
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| CN101603543A CN101603543A (en) | 2009-12-16 |
| CN101603543B true CN101603543B (en) | 2011-06-29 |
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| CN103138718B (en) * | 2011-11-24 | 2016-08-31 | 中国北车股份有限公司 | Signal processing apparatus, processing method and electric locomotive |
| CN104675736A (en) * | 2013-11-28 | 2015-06-03 | 英业达科技有限公司 | Control circuit for controlling rotation speed of fan by outputting square wave signal |
| CN109901047A (en) * | 2017-12-08 | 2019-06-18 | 陞达科技股份有限公司 | To detect the system and method for the signal propagation delay of fan chip |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2454987Y (en) * | 2000-11-06 | 2001-10-17 | 建准电机工业股份有限公司 | Fan motor of controlling rotational speed by pulse working period |
| CN101334673A (en) * | 2007-06-29 | 2008-12-31 | 鸿富锦精密工业（深圳）有限公司 | Computer fan control circuit and control method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2454987Y (en) * | 2000-11-06 | 2001-10-17 | 建准电机工业股份有限公司 | Fan motor of controlling rotational speed by pulse working period |
| CN101334673A (en) * | 2007-06-29 | 2008-12-31 | 鸿富锦精密工业（深圳）有限公司 | Computer fan control circuit and control method |
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| JP平1-91692A 1989.04.11 |
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