CN107762941A - Fans drive chip for main control chip radiating - Google Patents
Fans drive chip for main control chip radiating Download PDFInfo
- Publication number
- CN107762941A CN107762941A CN201610679970.8A CN201610679970A CN107762941A CN 107762941 A CN107762941 A CN 107762941A CN 201610679970 A CN201610679970 A CN 201610679970A CN 107762941 A CN107762941 A CN 107762941A
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- China
- Prior art keywords
- fan
- chip
- pwm
- main control
- radiating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- F04D27/007—Conjoint control of two or more different functions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/30—Control parameters, e.g. input parameters
- F05D2270/303—Temperature
Abstract
The present invention relates to a kind of fans drive chip for main control chip radiating, including input PWM detection modules, to detect PWM input duty cycles and adjust rotation speed of the fan and PWM input duty cycles are linear；MINSP detection modules are inputted, to detect MINSP voltages and set fan minimum speed；Soft-start module, to the limiting starting current when inputting PWM duty cycle and being higher than setting value；Soft commutation module, extend the fan commutation time to combine HALL signals；HALL signal detection modules, to detect HALL signals and make fan commutation according to HALL signals.Using the fans drive chip for being used for main control chip radiating of this kind of structure, based on Frequency-variable Modulation algorithm, using PWM and analog signal control rotation speed of the fan ability, the rotating speed for being controlled according to the heat load of environment and optimizing fan solves the problems, such as fan energy-saving design, is adapted to the radiating of the main control chips in field such as cloud computing.
Description
Technical field
The present invention relates to fans drive field, more particularly to master control radiator fan driving chip technical field, in particular to
A kind of fans drive chip for main control chip radiating.
Background technology
Fans drive chip of the prior art, tend to cause motor noise and the problem of larger, Wu Faman is lost
The needs of the normal production work of foot.Therefore, it is necessary to a kind of more excellent integrated fans drive chip of performance.
The content of the invention
The purpose of the present invention is the shortcomings that overcoming above-mentioned prior art, there is provided one kind can realize the steady commutation of fan
With low-noise high efficiency commutation, significantly reduce fan audio-frequency noise and service life and cause utilization rate of electrical it is higher
Be used for main control chip radiating fans drive chip.
To achieve these goals, the present invention has following form：
This is used for the fans drive chip of main control chip radiating, and it is mainly characterized by, and described driving chip includes：
PWN detection modules are inputted, are in PWM input duty cycles to detect PWM input duty cycles and adjust rotation speed of the fan
Linear relationship；
MINSP detection modules are inputted, to detect MINSP voltages and set fan minimum speed；
Soft-start module, to the limiting starting current when inputting PWM duty cycle and being higher than setting value；
Soft commutation module, extend the fan commutation time to combine HALL signals；
HALL signal detection modules, to detect HALL signals and make fan commutation according to HALL signals.
It is preferred that the described soft commutation time is the 12.5% of torque cycle.
It is preferred that 10k Ω pull-up electricity is provided between the inside PWM pins and VREF pins of described driving chip
Resistance.
It is preferred that when described fan is applied to temperature rate controlling, the inside PWM pins ground connection of described driving chip,
The resistance R1 of one negative temperature coefficient is set between VREF pins and MINSP pins.
It is preferred that it is provided with reference resistance Rref between the inside MINSP pins and ground of described driving chip.
It is preferred that anti-reverse protection module is additionally provided with inside described driving chip.
It is preferred that described driving chip also includes AD conversion module, described AD conversion module is to by input
The analog signal of MINSP voltages is converted to data signal；
It is preferred that described driving chip also includes output module, described output module will be will drive data signal
Square wave output is converted to after amplification.
It is preferred that described driving chip also include clock generator, testing control module, locked rotor protection module and
Magnetic field threshold value control register.
The fans drive chip for being used for main control chip radiating in the invention is employed, based on Frequency-variable Modulation algorithm, is used
PWM and analog signal control rotation speed of the fan ability, the rotating speed for being controlled according to the heat load of environment and optimizing fan solve fan
Energy-saving design problem, it is adapted to the radiating of the main control chips in field such as cloud computing；Soft start mechanism is integrated with, can Intelligent adjustment startup
Peak point current.Any radiator fan is allowed normally to start in minimum rated rotating speed, simultaneously, it is suppressed that the peak value electricity of startup
Stream, there is provided maximum flexibility and integrated level, suitable for solving to occur very big peak value or stifled from zero-speed to rated speed
Turn the application of the radiator fan of the various different range of electric current, improve the reliability of system.
Brief description of the drawings
Fig. 1 is the structured flowchart of the fans drive chip for being used for main control chip radiating of the present invention.
When Fig. 2 is that to input output PWM duty cycle that PWM and MINSP current potentials determine be 10%, the change of dutycycle during soft start
The schematic diagram of change.
Fig. 3 is input PWM and MINSP current potentials when to determine output PWM duty cycle be 100%, the change of dutycycle during soft start
The schematic diagram of change.
Fig. 4 is the schematic diagram of soft commutation time (6000rpm).
Fig. 5 is the schematic diagram of input and output PWM duty cycle transmission relation.
Fig. 6 input duty cycles 10%, 2kHz (yellow)；Output 10%, 30kHz (purple) schematic diagram.
Fig. 7 input duty cycles 10%, 100kHz (yellow)；Output 10%, 30kHz (purple) schematic diagram.
Fig. 8~9 are the schematic diagram that minimum speed sets MINSP.
Figure 10 is the schematic diagram of input duty cycle speed-regulating mode.
Figure 11 is the schematic diagram of temperature rate controlling.
Figure 12 is the schematic diagram of speed control mode.
Figure 13 is the schematic diagram of reverse-connection preventing circuit.
Figure 14 is the schematic diagram of ADC.
Figure 15 is the schematic diagram of the D/A converting circuit in circuit.
Figure 16 is the schematic diagram of output level module.
Figure 17 is the schematic diagram of output stage internal circuit.
The schematic diagram of digital controlled signal logical sequence in Figure 18 output stages.
Figure 19 is the multiplication factor that A is amplifier, and X, Y are the schematic diagram of the ratio of upper and lower electric capacity.
Figure 20 is the schematic diagram for adjusting amplifier need to not overlap clock signal that disappears.
When Figure 21 is that to input output PWM duty cycle that PWM and MINSP current potentials determine be 10%, dutycycle during soft start
The schematic diagram of change.
When Figure 22 is that to input output PWM duty cycle that PWM and MINSP current potentials determine be 100%, dutycycle during soft start
The schematic diagram of change.
Figure 23 is the schematic diagram of soft commutation time (6000rpm).
Embodiment
In order to more clearly describe the technology contents of the present invention, carried out with reference to specific embodiment further
Description.
This project is intended to research and development and the high property of a high integration of industrialization, high reliability, low noise and good energy-conserving effect
The fans drive chip of energy main control chip heat transmission.
Based on Frequency-variable Modulation thought, the sine wave vector control of SVPWM technology of the research based on Field orientable control (FOC)
Algorithm, and it is applied to Coordinate Conversion and inverse transformation, all multimodes such as PI is reconciled, rotating speed and location estimation and SVPWM, complete
180 degree control mode, the energy-saving design of fans drive chip is realized, solve motor noise in traditional scheme and larger ask is lost
Topic, improve the high integration and high reliability of chip.
Chip functions
1) soft start
(including releasing lock machine, overheat protector, Brown Out protections) is set to reduce starting current chip during starting fan
Soft start function, pass through digital circuit.
During starting fan：
The initial output duty cycle of starting fan is 40%, and then exporting PWM duty cycle will be changed with+1%/20ms.
After HALL signals complete 4 commutations, output PWM duty cycle will be with+1%/20ms (input PWM and MINSP current potentials
The output PWM duty cycle of decision is more than 40%) or -1%/20ms (inputs the output PWM duty cycle that PWM and MINSP current potentials determine
Less than 40%) changing, until output PWM duty cycle is consistent with inputting the output PWM duty cycle that PWM and MINSP current potentials determine.
(such as Fig. 2 and Fig. 3)
Such as：When input duty cycle is 100%, soft start output duty cycle transformation period is 60 × 20ms=1.2ms
This function limiting starting current under conditions of input duty cycle is higher；Under the conditions of input duty cycle is relatively low, it is ensured that fan is still
It can start.
2) soft commutation (Sofe Switch)
To reduce fan noise, chip realizes soft commutation by adjusting output duty cycle.For the overall performance that has ensured and
Low noise, soft commutation time are constant for the 12.5% of torque cycle.For different rotation speeds of the fan, the time range ratio of soft commutation
Larger (between 0.3ms-8ms).This function is realized by digital circuit (with reference to HALL signals).(torque cycle is believed for HALL
The half in number cycle)
During soft commutation, for different rotating speeds dutycycle change with time rate difference.
Such as in Fig. 4：Rotation speed of the fan is 6000rpm (two pairs of magnetic poles), so the HALL signal periods are 5ms, torque cycle
For 2.5ms, the soft commutation time is 2.5ms × 12.5%=0.3125ms.
3) speed control
Two speed control pins：PWM and MINSP.
* PWM inputs control
Fan can realize that PWM duty cycle inputs speed governing, and input PWM signal frequency scope is in 0.1~100kHz.Input
Pwm signal is handled by digital circuit and produces output pwm signal.Output pwm signal frequency-invariant be 30kHz, dutycycle with it is defeated
It is identical to enter signal, to ensure that rotation speed of the fan is linear with input duty cycle, and audible noise is not present.Input and output duty
Ratio error is within ± 2%.
10k Ω pull-up resistor is provided between chip internal PWM pins and VREF pins.When outside input pwm signal
When, can be directly with open-drain nmos pipes (or npn pipes of open collector) driving input pwm signal.When in PWM input pull-downs
When, this resistance can ensure that fan full-speed operation.
* minimum speed sets MINSP
Fan is by setting MINSP voltages to realize that minimum speed sets function, to meet to have the application of minimum speed requirement.
The voltage of analog-to-digital conversion module collection MINSP pins in circuit, and by MINSP voltage conversions into square-wave signal.Digital circuit
Square-wave signal is exported according to analog-to-digital conversion fan minimum speed is set.
R1 in Fig. 8 is the RP1 in Fig. 9.
* speed-regulating mode
PWM inputs speed-regulating mode (no minimum speed is set) is as shown in Figure 10.
Under this on-link mode (OLM), rotation speed of the fan is only relevant with input pwm signal duty cycle signals, and (output duty cycle accounts for input
Sky is than identical).Input and output duty cycle range is 0~100%.
* PWM inputs speed-regulating mode (having minimum speed setting)
* temperature rate controlling pattern (using negative temperature coefficient resister)
When fan is applied to temperature rate controlling, pwm signal is met into GND, fan speed is determined by MINSP current potentials completely.Such as
Figure below：In the resistance R1 of a VREF and MINSP indirect negative temperature coefficient.R1 reduces when the temperature increases, MINSP potential rises
Height, so that the minimum speed limit increase of fan, rotation speed of the fan increase.
* two kinds of speed operation patterns
Fan can be operated in two kinds of velocity modes.Below figure, when PWM input high levels, fan full-speed operation；Work as PWM
During input low level, rotation speed of the fan is determined by R1 and RREF electric resistance partial pressures.
Module analysis
Analog portion circuit function is divided into several modules：BG、VCC、VREF、OSC、POR、TSD、BrownOut、PWM、FG、
DAC, ReverseP, ADC, OUTPUT, HALLDET (HALL signal detections).Wherein BG (band-gap reference), VCC (power supply),
VREF (reference voltage), OSC (oscillator), POR (electrification reset), TSD (crossing Thermal shutdown), BrownOut (undervoltage turnoff), PWM
(pulsewidth modulation), FG (Rotating speed measring), DAC (digital-to-analogue conversion) are conventional modules, and analog circuit is easily realized, do not do excessive point
Analysis.
Needing the module of labor has：ReverseP (reverse protection), ADC (analog-to-digital conversion), OUTPUT (output),
HALLDET (hall signal detection).
1) ReverseP modules (anti-reverse)
Integrated chip has the protection circuit for preventing reverse power connection.When reverse power connection, it is reversely resistance to that chip maximum can bear 18V
Pressure, reverse current are no more than 1mA.
2) ADC
Fan realizes that minimum speed sets function by analog signal MINSP voltages.Fan speed is controlled by digital module
Processing, the analog signal of input must be identified by data signal, so needing ADC (analog-to-digital conversion).ADC in circuit is adopted
Collect the voltage of MINSP pins, and by MINSP voltage conversions into the data signal for being loaded with MINSP electric potential signals.Digital circuit according to
Analog-to-digital conversion module output digit signals set fan minimum speed.
3) OUTPUT modules
Output module is by digital low level signal amplification to having sufficiently large driving force, maximum drive current 1A；It is and defeated
Go out level and prevent down tube from ganging up, afterflow and pincers pressure function.Number conversion output square wave function is converted into,
The input signal of output stage is AA38, output driving OUT1；Export the same phase of OUT1 and AA38 signals.Remaining is defeated
It is current source bias signal and enable signal to enter signal.VCC is that the power supply of digital circuit, VDD1 are predrive part electricity in module
Source, VDD are H bridges output level power supply, the substrate contact that X339_MINUS is H bridge output stage PMOSs.
When enable signal AA37 is low, output stage output high resistant；When AA37 is high, output stage normal work.As above
Figure output stage normal work (AA37 for height), when AA38 signals by it is low uprise (or by high step-down) after, X238_Y and X241 have
Delay, predriving stage to the electric discharge of H bridge down tubes grid, pass down tube (to the electric discharge of H bridge upper tubes grid, shutting pipe), works as down tube in delay herein
After gate source voltage sufficiently small (upper tube gate source voltage is sufficiently small), X238_Y and X241 signals just follow AA38 signal intensities, this
After start out H bridges upper tube (opening H bridges down tube).This delay is to prevent that down tube is ganged up on H bridges.
Afterflow：When OUT1 is by high step-down, pipe is first shut, now the parasitic diode afterflow by down tube substrate to leakage；
When OUT1 is by low uprise, down tube is first closed, now afterflow is drained to the parasitic diode of substrate by upper tube, passes through ReverseP again
PMOS to the VDD of module.
Clamp：During upper tube afterflow, H bridge PMOS substrates are clamped by three series zener pipes.
4) HALLDET modules
Chip internal is integrated with HALL sensors.HALL sensors are by checking that magnetic direction determines position of fan.H bridge roots
Make the accurate commutation of fan according to the HALL signals of amplification.HALL sensors export HALL signals, through without imbalance amplify, finally pass through than
HALL square-wave signals are drawn compared with device.To prevent external disturbance from making HALL signal false triggerings, HALL signals need to set certain hysteresis.
Figure 19 is the HALL amplifiers (realization for analyzing its disappearance conditioning function) extracted in MXL90287.
Disappear and adjust amplifier need to not overlap clock signal, waveform is as shown in figure 20.
Under mode of operation：The function that digital module need to be realized
Under mode of operation：Simulate available signal：
HALL+、HALL-(AA7、AA8)；
OSC(AA32)；
PWM inputs (AA40)；
The data signal (AA16) that MINSP changes through ADC；
MINSP earthing detections signal (AA34)；
Protect signals have：
TSD(AA29)；
POR(BB2)；
BrownOut(AA33)。
Under mode of operation：The signal that numeral need to provide
What HALL disappearances were adjusted does not overlap clock signal (AA10, AA11, AA12, AA15)；
MINSP ADC chopper clock signals (AA15)；
Output stage control signal (AA36, AA38), output shut-off protection signal (AA37)；
FG output signals (AA39)；
Digital-to-analogue conversion data signal (is used to control magnetic field threshold value) (AA17~AA26)；
Under the mode of operation：The function that digital circuit need to be completed
According to HALL signal output fan driving signals；Produce the clock signal (not overlapping) that HALL disappearances are adjusted
Soft start
During starting fan (including releasing lock machine, overheat protector, Brown Out protections)：
The initial output duty cycle of starting fan is 40%, and then exporting PWM duty cycle will be changed with+1%/20ms.
After HALL signals complete 4 commutations, output PWM duty cycle will be with+1%/20ms (input PWM and MINSP current potentials
The output PWM duty cycle of decision is more than 40%) or -1%/20ms (inputs the output PWM duty cycle that PWM and MINSP current potentials determine
Less than 40%) changing, until output PWM duty cycle is consistent with inputting the output PWM duty cycle that PWM and MINSP current potentials determine.
(such as Figure 21 and 22)
Soft commutation
Soft commutation is realized by adjusting output duty cycle, and the soft commutation time is constant for the 12.5% of torque cycle.For not
Same rotation speed of the fan, the time range of soft commutation are bigger (between 0.3ms~8ms).This function by digital circuit (with reference to
HALL signals) realize.(torque cycle is the half of HALL signal periods)
During soft commutation, for different rotating speeds dutycycle change with time rate difference.
The fans drive chip for being used for main control chip radiating in the invention is employed, based on Frequency-variable Modulation algorithm, is used
PWM and analog signal control rotation speed of the fan ability, the rotating speed for being controlled according to the heat load of environment and optimizing fan solve fan
Energy-saving design problem, it is adapted to the radiating of the main control chips in field such as cloud computing；Soft start mechanism is integrated with, can Intelligent adjustment startup
Peak point current.Any radiator fan is allowed normally to start in minimum rated rotating speed, simultaneously, it is suppressed that the peak value electricity of startup
Stream, there is provided maximum flexibility and integrated level, suitable for solving to occur very big peak value or stifled from zero-speed to rated speed
Turn the application of the radiator fan of the various different range of electric current, improve the reliability of system.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that it can still make
Various modifications and alterations are without departing from the spirit and scope of the present invention.Therefore, specification and drawings are considered as illustrative
It is and nonrestrictive.
Claims (9)
1. a kind of fans drive chip for main control chip radiating, it is characterised in that described driving chip includes：
PWM detection modules are inputted, to detect PWM input duty cycles and adjust rotation speed of the fan and PWM input duty cycles are linear
Relation；
MINSP detection modules are inputted, to detect MINSP voltages and set fan minimum speed；
Soft-start module, to the limiting starting current when inputting PWM duty cycle and being higher than setting value；
Soft commutation module, extend the fan commutation time to combine HALL signals；
HALL signal detection modules, to detect HALL signals and make fan commutation according to HALL signals.
2. the fans drive chip according to claim 1 for main control chip radiating, it is characterised in that described soft to change
The phase time is the 12.5% of torque cycle.
3. the fans drive chip according to claim 1 for main control chip radiating, it is characterised in that described driving
10k Ω pull-up resistor is provided between the inside PWM pins and VREF pins of chip.
4. the fans drive chip according to claim 1 for main control chip radiating, it is characterised in that described fan
When being applied to temperature rate controlling, the inside PWM pins ground connection of described driving chip, set between VREF pins and MINSP pins
The resistance R1 of one negative temperature coefficient.
5. the fans drive chip according to claim 1 for main control chip radiating, it is characterised in that described driving
Reference resistance Rref is provided between the inside MINSP pins and ground of chip.
6. the fans drive chip according to claim 1 for main control chip radiating, it is characterised in that described driving
Chip internal is additionally provided with anti-reverse protection module.
7. the fans drive chip according to claim 1 for main control chip radiating, it is characterised in that described driving
Chip also includes AD conversion module, and described AD conversion module by the analog signal of the MINSP voltages of input being converted to number
Word signal.
8. the fans drive chip according to claim 1 for main control chip radiating, it is characterised in that described driving
Chip also includes output module, and described output module exports data signal will be driven to be converted to square wave after amplifying.
9. the fans drive chip according to claim 1 for main control chip radiating, it is characterised in that described driving
Chip also includes clock generator, testing control module, locked rotor protection module and magnetic field threshold value control register.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610679970.8A CN107762941A (en) | 2016-08-16 | 2016-08-16 | Fans drive chip for main control chip radiating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610679970.8A CN107762941A (en) | 2016-08-16 | 2016-08-16 | Fans drive chip for main control chip radiating |
Publications (1)
| Publication Number | Publication Date |
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| CN107762941A true CN107762941A (en) | 2018-03-06 |
Family
ID=61260217
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610679970.8A Pending CN107762941A (en) | 2016-08-16 | 2016-08-16 | Fans drive chip for main control chip radiating |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109374144A (en) * | 2018-11-13 | 2019-02-22 | 中国电子科技集团公司第四十七研究所 | A kind of temperature sensor of energy output pwm signal |
| CN110365260A (en) * | 2019-07-08 | 2019-10-22 | 江苏科技大学 | Brushless DC electromotor start flowing control method and control system |
| CN110688264A (en) * | 2018-07-06 | 2020-01-14 | 鸿富锦精密工业(武汉)有限公司 | Load simulation circuit |
| CN111585482A (en) * | 2020-04-22 | 2020-08-25 | 华帝股份有限公司 | Control method of brushless direct current motor |
| CN117792155A (en) * | 2024-02-23 | 2024-03-29 | 晶艺半导体有限公司 | Soft commutation control circuit and method for motor drive and motor drive system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110688264A (en) * | 2018-07-06 | 2020-01-14 | 鸿富锦精密工业(武汉)有限公司 | Load simulation circuit |
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| CN110365260A (en) * | 2019-07-08 | 2019-10-22 | 江苏科技大学 | Brushless DC electromotor start flowing control method and control system |
| CN110365260B (en) * | 2019-07-08 | 2021-03-23 | 江苏科技大学 | Brushless direct current motor starting control method and control system |
| CN111585482A (en) * | 2020-04-22 | 2020-08-25 | 华帝股份有限公司 | Control method of brushless direct current motor |
| CN111585482B (en) * | 2020-04-22 | 2022-06-17 | 华帝股份有限公司 | Control method of brushless direct current motor |
| CN117792155A (en) * | 2024-02-23 | 2024-03-29 | 晶艺半导体有限公司 | Soft commutation control circuit and method for motor drive and motor drive system |
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