CN114718894A - Multi-gear direct current control circuit - Google Patents
Multi-gear direct current control circuit Download PDFInfo
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- CN114718894A CN114718894A CN202210393044.XA CN202210393044A CN114718894A CN 114718894 A CN114718894 A CN 114718894A CN 202210393044 A CN202210393044 A CN 202210393044A CN 114718894 A CN114718894 A CN 114718894A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- 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
- F05D2270/50—Control logic embodiments
- F05D2270/52—Control logic embodiments by electrical means, e.g. relays or switches
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention discloses a multi-gear direct current control circuit, which comprises a voltage control module and a gear control module; the voltage control module outputs a corresponding potential signal to a control end of the gear control module according to at least one path of level signal input by an input end of the voltage control module; the gear control module is used for converting a first power supply input by an input end of the gear control module into control voltage of a corresponding gear according to a potential signal input by a control end of the gear control module, and outputting the control voltage to the positive electrode of the fan interface through an output end. The fan rotating speed can be stably adjusted, CPU resources are not occupied, the phenomenon that rotating speed control is abnormal when a CPU is overloaded is avoided, and more refined fan rotating speed gear adjustment is achieved.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a multi-gear direct current control circuit.
Background
Fans are widely used in security products, such as NVRs, DVRs, and switches, which require airflow to provide adequate cooling conditions for various components. The fans commonly used in such products are mostly brushless dc fans, including two-wire fans, three-wire fans, and four-wire fans. Most of the existing brushless direct current fans adopt controllers to output PWM signals to control fan gears, and the rotating speed of the fan is controlled by changing the duty ratio of the PWM signals and changing the power supply voltage of the fan.
Although the fan rotating speed can be regulated by directly outputting the PWM signal through the controller, the CPU is very occupied by outputting the PWM signal through the CPU, and the duty ratio of the output PWM signal may not reach the required value due to the scheduling of other high-priority tasks in the CPU, so the control of the fan gear too depends on the performance of the CPU, and the control of the power supply voltage is unstable.
Disclosure of Invention
In order to solve the above problems, an embodiment of the present invention provides a multi-stage dc control circuit, which does not occupy CPU resources and can stably and accurately adjust the rotation speed of a fan.
The embodiment of the invention provides a multi-gear direct current control circuit, which comprises a voltage control module and a gear control module;
the voltage control module outputs a corresponding potential signal to a control end of the gear control module according to at least one path of level signal input by an input end of the voltage control module;
the gear control module is used for converting a first power supply input by an input end of the gear control module into control voltage of a corresponding gear according to a potential signal input by a control end of the gear control module, and outputting the control voltage to the positive electrode of the fan interface through an output end.
Preferably, the voltage control module includes N +1 resistance units and N switching units;
the first end of the 1 st resistance unit is used for connecting a second power supply, the second end of the 1 st resistance unit is connected with the input end of the ith switch unit through the (i +1) th resistance unit, and the output end of the ith switch unit is grounded; the control end of the ith switch unit is used as the ith input end of the voltage control module and is used for the ith path of level signal;
the second section of the 1 st resistance unit is used as the output end of the voltage control module and used for outputting a potential signal;
wherein N is equal to or greater than 1, i is 1, 2.
As a preferable scheme, the circuit further comprises a first capacitance unit;
the first end of the first capacitor unit is connected with the input end of the gear control module, and the second end of the first capacitor unit is grounded.
Preferably, the gear control module comprises a first resistance unit, a second resistance unit, a third resistance unit, a first switch unit, a second switch unit and a current limiting unit;
a first end of the first resistance unit is used as an input end of the gear control module, a second end of the first resistance unit is connected with an input end of the first switch unit, an output end of the first switch unit is grounded through the second resistance unit, and a control end of the first switch unit is used as a control end of the gear control module;
the first end of the first resistance unit is also connected with the input end of the second switch unit, the control end of the second switch unit is connected with the input end of the first switch unit, the output end of the second switch unit is connected with the first end of the current limiting unit, the second end of the current limiting unit is grounded, and the output end of the second switch unit is used as the output end of the gear control module and used for outputting control voltage to the fan interface;
the first end of the current limiting unit is also connected with the output end of the first switch unit through the third resistor unit.
Further, the first switching unit comprises a first switching tube;
the input end of the first switch tube is used as the input end of the first switch unit, the output end of the first switch tube is used as the output end of the first switch unit, and the control end of the first switch tube is used as the control end of the first switch unit;
the second switch unit comprises a P-MOS tube;
and the source electrode of the P-MOS tube is used as the input end of the second switch unit, the grid electrode of the P-MOS tube is used as the control end of the second switch unit, and the drain electrode of the P-MOS tube is used as the output end of the second switch unit.
Preferably, the current limiting unit includes a schottky diode;
the cathode of the Schottky diode is used as the first end of the current limiting unit, and the anode of the Schottky diode is used as the second end of the current limiting unit.
As a preferable scheme, the circuit further comprises a first magnetic bead;
the first end of the first magnetic bead is connected with the output end of the gear control module, and the second end of the first magnetic bead is used for being connected with the anode of the fan interface.
Preferably, the gear control module further comprises a first filtering unit;
the first end of the first filtering unit is connected with the output end of the second switch unit, and the second end of the first filtering unit is grounded.
Further, the circuit further comprises a second filtering unit;
the first end of the second filtering unit is connected with the second end of the first magnetic bead, and the second end of the second filtering unit is grounded.
Preferably, the circuit further comprises a second magnetic bead;
the first end of the second magnetic bead is used for being connected with the negative electrode of the fan interface, and the second end of the second magnetic bead is grounded.
According to the multi-gear direct current control circuit, the on-off of the switch tube of the voltage control module is controlled through at least one path of level signal input by the input end so as to control the conduction of the circuit, the potential signal of the voltage control circuit is controlled by using the principle of resistance voltage division, and the voltage of a power supply is converted into the driving voltage for controlling the fan according to the potential signal. Compare with the fan of current full speed operation or the mode that utilizes PWM signal control input voltage duty cycle, regulation fan rotational speed that can be stable adapts to multiple different application demands to do not occupy the CPU resource, it is more accurate on rotational speed control, can not rely on CPU's performance, avoid transshipping at CPU and lead to rotational speed control unusual, circuit design is simple, and convenient to use only needs the level state of control GPIO mouth can reach rotational speed control's effect.
Drawings
Fig. 1 is a schematic structural diagram of a multi-stage dc control circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a multi-stage dc control circuit according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, a schematic structural diagram of a multi-stage dc control circuit provided in an embodiment of the present invention is shown, where the circuit includes a voltage control module and a stage control module;
the voltage control module comprises at least one input end, and each input end is connected with an external GPIO (general purpose input/output) and used for inputting a path of level signal; the output end of the voltage control module is connected with the control end of the gear control module;
the input end of the gear control module is used for inputting a first power supply, and the output end of the gear control module is used for controlling a voltage signal to the positive pole of the fan interface.
The voltage control module detects the potential level of each path of level signal by identifying at least one path of input level signal and outputs a corresponding potential signal to a control end of the gear control signal;
the gear control signal converts the voltage of the first power supply VCC1 input by the input end of the gear control signal into a control voltage corresponding to the gear according to the potential signal input by the control end, outputs the control voltage to the anode of the 2-wire/3-wire fan interface, and controls the rotating speed of the fan at different gears.
Converting the input multi-path level signals into a path of potential signals through a voltage control module, and outputting corresponding control voltage to a fan interface by a gear control module according to the input potential signals so as to control the rotating speed of a fan; the control of the fan rotating speed through the multi-channel high-low level signals is realized, the fan rotating speed is controlled without depending on the PWM (pulse width modulation) signal output by a CPU (central processing unit), CPU resources are not occupied, and the fan rotating speed can be stably and accurately adjusted through the conversion of the voltage control module and the gear control module.
Example two
In another embodiment provided by the present invention, the voltage control module of the circuit includes N +1 resistance units and N switch units;
the first end of the 1 st resistance unit is used for connecting a second power supply, the second end of the 1 st resistance unit is connected with the input end of the ith switch unit through the (i +1) th resistance unit, and the output end of the ith switch unit is grounded; the control end of the ith switch unit is used as the ith input end of the voltage control module and is used for the ith path of level signal;
the second section of the 1 st resistance unit is used as the output end of the voltage control module and used for outputting a potential signal;
wherein N is equal to or greater than 1, i is 1, 2.
Fig. 2 is a schematic circuit diagram of a multi-stage dc control circuit according to another embodiment of the present invention; in this embodiment, a specific structure of the voltage control module is described by taking N ═ 3 as an example;
the voltage control module comprises 4 resistance units and 3 switch units;
it should be noted that each resistance unit is composed of impedance devices composed of series-parallel resistors, and a specific resistor is taken as an example in fig. 2 of this embodiment to illustrate the principle of the circuit;
it should be noted that each switch unit is composed of an impedance device composed of switch tubes or a device with a switching function, and a specific switch tube is taken as an example in fig. 2 of this embodiment to illustrate the principle of the circuit;
it should be noted that, in the embodiment, the switch unit in fig. 2 is a PNP type triode, and a base, a collector, and an emitter of the PNP type triode are respectively used as a control end, an output end, and an input end of the switch unit.
The first end of the 1 st resistor unit R1 is used for connecting the second power supply VCC2, the second end of the 1 st resistor unit R1 is respectively connected with the first end of the 2 nd resistor unit R2, the first end of the 3 rd resistor unit R3 and the first end of the 4 th resistor unit R4, and the first resistor unit R1The second end of the 1 is also used as the output end of the voltage control module and is used for outputting a potential signal Vi。
The second end of the 2 nd resistor unit R2 is connected with the input end of the 1 st switch unit K1, the output end of the 1 st switch unit K1 is grounded, and the control end of the 1 st switch unit K1 is used as the 1 st input end I1 of the voltage control unit and is connected with a GPIO1 port of an external input potential signal;
the second end of the 3 rd resistor unit R3 is connected with the input end of the 2 nd switch unit K2, the output end of the 2 nd switch unit K2 is grounded, and the control end of the 2 nd switch unit K2 is used as the 2 nd input end I2 of the voltage control unit and is connected with a GPIO2 port of an external input potential signal;
the second end of the 4 th resistor unit R4 is connected with the input end of the 3 rd switch unit K3, the output end of the 3 rd switch unit K3 is grounded, and the control end of the 3 rd switch unit K3 is used as the 3 rd input end I3 of the voltage control unit and is connected with a GPIO3 port of an external input potential signal;
GPIO1 ~ 3 are led out from the main chip and connected with the control ends of switch tubes K1, K2 and K3 in the voltage control module, the output ends of the switch tubes are directly grounded, the collectors are respectively connected with R2, R3 and R4, if the GPIO ports output high level, the corresponding switch tubes are conducted, and the potential signal V output by the output ends is conductediThe voltage is obtained by dividing R4 by the resistance which is correspondingly conducted or the resistance which is correspondingly conducted in parallel, and the potential signal V of the gear control circuit is obtained in such a wayi。
By programming the resistors in the voltage control module, the potential signal output of multiple voltage levels can be realized, and the number of the corresponding output voltage levels is 2NN is the number of switch units in the voltage control module, namely the number of GPIO ports for controlling voltage;
in the embodiment, 3 GPIO ports are used for realizing 8 voltage grade outputs, 8 rotating speed grades can be realized through the gear control module, and the fine degree of gear control can be improved by increasing the quantity of GPIOs; for fans of different models, the corresponding voltage dividing resistance needs to be recalculated.
Realize a plurality of gear rotational speeds through a plurality of inputs to through increasing the GPIO mouth quantity of input, realize more meticulous voltage rotational speed gear control.
EXAMPLE III
In a further embodiment provided by the present invention, referring to fig. 2, the circuit further comprises a first capacitive unit C1; a first end of the first capacitor unit C1 is connected with the input end of the gear control module, and a second end of the first capacitor unit C1 is grounded;
it should be noted that, in the present embodiment, the first capacitor unit C1 is a capacitor, and in other embodiments, the first capacitor unit may be a capacitive reactance device composed of several series-parallel capacitors.
The first capacitor unit at the input end of the gear control module is grounded, so that the change speed of a potential signal output by the voltage control module during switching of the starting voltage and the rotating speed is reduced, and the stability of the circuit is improved.
Example four
In still another embodiment of the present invention, the gear control module of the circuit includes a first resistor unit R5, a second resistor unit R6, a third resistor unit R7, a first switch unit K4, a second switch unit K5, and a current limiting unit D1.
First resistance unit R5's first end is as gear control module's input for be connected with first power supply VCC1, first resistance unit R5's second end with first switch unit K4's input is connected, first switch unit K4's output passes through second resistance unit R6 ground connection, first switch unit K4's control end is as gear control module's control end for input potential signal.
First resistance unit R5's first end still with second switch unit K5's input is connected, second switch unit K5's control end with first switch unit K4's input is connected, second switch unit K5's output with current limiting unit D's first end is connected, current limiting unit D's second end ground connection, second switch unit's output does gear control module's output for defeated gear control module's outputOut of control voltage VoInterfacing the fan.
The first end of the current limiting unit D is further connected to the output end of the first switching unit K4 through the third resistance unit R7.
It should be noted that the first switch unit and the second switch unit are composed of switch tubes or field effect tubes having a switching function and an amplifying function.
It should be noted that the current-limiting power supply is used to limit the magnitude of the ground current of the second switch unit, so as to avoid overload damage to the second switch unit.
The control of output voltage is realized through the first switch unit and the second switch unit, the conduction of the first switch unit is controlled through a potential control signal input by the gear control end, the conduction current of the first switch unit is controlled, the conduction current of the second switch unit is controlled, the partial pressure on the third resistor unit is controlled, the control voltage output by the first power supply is controlled, and the rotating speed of the fan is controlled.
EXAMPLE five
In another embodiment provided by the present invention, referring to fig. 2, the first switching unit K4 includes a first switching transistor Q1, the first switching transistor is a PNP type triode;
a collector of the first switch tube Q1 serves as an input terminal of the first switch unit K4, an output terminal of the first switch tube Q1 serves as an output terminal of the first switch tube K4, and a control terminal of the first switch tube Q1 serves as a control terminal of the first switch tube K4;
the second switching unit K5 comprises a P-MOS tube Q2;
the source of the P-MOS transistor Q2 is used as the input terminal of the second switch unit K5, the gate of the P-MOS transistor Q2 is used as the control terminal of the second switch unit K5, and the drain of the P-MOS transistor Q2 is used as the output terminal of the second switch unit K5.
In the embodiment, the voltage of the first power supply VCC1 is 12V, and the voltage of the second power supply VCC2 is 3.3V;
assume that the base-emitter voltage of the first switch transistor Q1 is VbeGate and source of beta, P-MOSFET Q2 with amplificationVoltage between poles is VgsControl voltage VoAnd potential signal ViThe voltage relationship of (a) can be represented by the following calculation formula:
Vo＝(Vi-Vbe)+I2*R7；
I2＝(Vi-Vbe)/R6-I3(1+1/β)；
I3＝Vgs/R5；
finishing to obtain: vo＝(R7/R6+1)*(Vi-Vbe)-R7*Vgs*(1+1/β)/R5；
From the above formula, the resistance values of R5, R6 and R7 can be adjusted, as long as V is determinedgsThe control voltage V can be determinedoAnd potential signal ViThe relation between the P-MOS tube and the fan is that when the P-MOS tube regulates the voltage of the fan, the P-MOS tube always works in a semi-conducting state, VgsV which can be considered as P-MOS tubegsth。
Control voltage VoAnd potential signal ViProportional, with a constant term, two requirements need to be considered when determining the values of R5, R6, R7:
1. when the potential signal ViWhen the maximum value is reached, the calculated value of Vo is more than or equal to 12V, the error of the 3.3V voltage of the second power supply VCC2 is considered in the calculation, the minimum value is 3.2V according to-3% error, and the V of the first switch tube Q1 is calculatedbeTaking the maximum value of 0.85V, the base current I of the triode in the voltage control modulebThe influence of the voltage drop across the resistor on the potential signal Vi is taken as IbMaximum time caused ViThe pressure drop is maximum 0.035V, VgsthThe maximum value is 2.1V, and the minimum value beta of the triode amplification factor is 60.
2、Vo/ViThe slope of the curve is as small as possible to realize accurate gear control and ensure the potential signal ViHas a larger dynamic range, if the slope is larger, the potential signal ViA small adjustment would result in a large change in fan speed, which is not easily adjustable.
In combination with the above formula, the circuit needs to consider two requirements when in specific use:
1、R7*Vgs(1+1/β)/R5 should be as small as possible, i.e. R7/R5 should be relatively small;
2. when V isiAt the maximum, Vo is 12V, that is, 12 (R7/R6+1) (3.165-0.7) - (R7 × 2.1) (1+1/60)/R5, since three resistance values need to be fixed to two values to obtain a set of data, R5 is selected as 100k, R6 is selected as 10k, and R7 is selected as 42.35k, and 43.2k is actually selected.
After the R1, the R2 and the R3 are determined, a control voltage V can be obtainedoAnd potential signal ViIn this case, the voltage error of the second power supply VCC2 is 3.3V, and the voltage of the first switch Q1 is VbeThe parameters with equal value ranges are calculated by using conventional values, namely Vo＝5.3Vi-4.03(V)；
Assuming that the resistance of the first resistor unit R1 is 10k Ω, the resistance of the second resistor unit R2 is 20k Ω, the resistance of the third resistor unit R3 is 47.5k Ω, and the resistance of the fourth resistor unit R4 is 100k Ω, GPIO 1-3 level signals and potential signals V are obtained at this timeiAnd a control voltage VoThe corresponding relation table of (2):
table 1 GPIO1 ~ 3 level signal, potential signal Vi and control voltage Vo corresponding table:
| GPIO1/2/3 | Vivoltage (V) | VoVoltage (V) |
| 000 | 3.30 | 12 |
| 001 | 3.01 | 11.923 |
| 010 | 2.76 | 10.598 |
| 011 | 2.56 | 9.538 |
| 100 | 2.26 | 7.948 |
| 101 | 2.13 | 7.259 |
| 110 | 2.01 | 6.623 |
| 111 | 1.91 | 6.093 |
The level state through GPIO mouth controls the break-make of the switch tube of voltage control module and then control switching on of circuit, utilizes the principle control voltage control circuit's of resistance partial pressure potential signal, turns into the drive voltage of control fan according to potential signal again with power supply's voltage. Compare with the fan of current full speed operation or the mode that utilizes PWM signal control input voltage duty cycle, regulation fan rotational speed that can be stable adapts to multiple different application demands to do not occupy the CPU resource, it is more accurate on rotational speed control, can not rely on CPU's performance, avoid transshipping at CPU and lead to rotational speed control unusual, circuit design is simple, and convenient to use only needs the level state of control GPIO mouth can reach rotational speed control's effect.
EXAMPLE six
In another embodiment provided by the present invention, referring to fig. 2, the current limiting unit D specifically includes a schottky diode X;
the cathode of the schottky diode X serves as a first terminal of the current limiting unit D, and the anode of the schottky diode X serves as a second terminal of the current limiting unit D.
And the second switch unit is prevented from passing through too high current intensity by reversely connecting the Schottky diode, so that the second switch unit is protected.
EXAMPLE seven
In yet another embodiment provided by the present invention, referring to fig. 2, the circuit further comprises a first magnetic bead FB 1;
the first end of the first magnetic bead FB1 is connected with the output end of the gear control module, and the second end of the first magnetic bead FB1 is used for being connected with the positive electrode FAN _ POWER of the FAN interface J14 and outputting a control voltage to supply POWER to the FAN.
RF noise in the control voltage output by the gear control module is eliminated through the first magnetic beads, and damage to a motor connected with a fan interface is avoided.
Example eight
In a further embodiment provided by the present invention, referring to fig. 2, the gear control module further comprises a first filtering unit L1;
a first end of the first filtering unit L1 is connected with the output end of the second switching unit K5, and a second end of the first filtering unit L1 is grounded;
it should be noted that the first filtering unit may include a plurality of capacitors, and in fig. 2, the first filtering unit L1 includes a second capacitor C2 and a third capacitor C3;
the second capacitor and the third capacitor are used for filtering in different wave bands respectively, and the control voltage output by the voltage control module is filtered through the first filtering unit, so that the stability of output signals is improved.
Example nine
In a further embodiment provided by the invention, with reference to fig. 2, the circuit further comprises a second filtering unit L2;
a first end of the second filtering unit L2 is connected to the second end of the first magnetic bead FB1, and a second end of the second filtering unit L2 is grounded;
it should be noted that the second filtering unit may include a plurality of capacitors, and in fig. 2, the second filtering unit L2 includes a fourth capacitor C4 and a fifth capacitor C5;
the fourth capacitor and the fifth capacitor are used for filtering in different wave bands respectively, and the control voltage output by the magnetic beads is filtered through the second filtering unit, so that the stability of output signals is improved.
Example ten
In yet another embodiment provided by the present invention, referring to fig. 2, the circuit further comprises a second magnetic bead FB 2; the first end of the second magnetic bead FB2 is used for being connected with the negative FAN _ GND of the FAN interface J14, and the second end of the second magnetic bead FB2 is grounded; pin RD1 of the fan interface is a speed output signal or rotor lock alarm signal, related to the fan model number.
Through the magnetic bead ground connection of fan interface, improve fan interface current's stability.
It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
Claims (10)
1. A multi-gear direct current control circuit is characterized by comprising a voltage control module and a gear control module;
the voltage control module outputs a corresponding potential signal to a control end of the gear control module according to at least one path of level signal input by an input end of the voltage control module;
the gear control module is used for converting a first power supply input by an input end of the gear control module into control voltage of a corresponding gear according to a potential signal input by a control end of the gear control module, and outputting the control voltage to the positive electrode of the fan interface through an output end.
2. The multi-gear direct current control circuit according to claim 1, wherein the voltage control module comprises N +1 resistance units and N switch units;
the first end of the 1 st resistance unit is used for connecting a second power supply, the second end of the 1 st resistance unit is connected with the input end of the ith switch unit through the (i +1) th resistance unit, and the output end of the ith switch unit is grounded; the control end of the ith switch unit is used as the ith input end of the voltage control module and is used for the ith path of level signal;
the second section of the 1 st resistance unit is used as the output end of the voltage control module and used for outputting a potential signal;
wherein, N is more than or equal to 1, and i is more than or equal to 1, 2.
3. The multi-range direct current control circuit of claim 1, further comprising a first capacitive unit;
the first end of the first capacitor unit is connected with the input end of the gear control module, and the second end of the first capacitor unit is grounded.
4. The multi-gear direct current control circuit according to claim 1, wherein the gear control module comprises a first resistance unit, a second resistance unit, a third resistance unit, a first switch unit, a second switch unit and a current limiting unit;
a first end of the first resistance unit is used as an input end of the gear control module, a second end of the first resistance unit is connected with an input end of the first switch unit, an output end of the first switch unit is grounded through the second resistance unit, and a control end of the first switch unit is used as a control end of the gear control module;
the first end of the first resistance unit is also connected with the input end of the second switch unit, the control end of the second switch unit is connected with the input end of the first switch unit, the output end of the second switch unit is connected with the first end of the current limiting unit, the second end of the current limiting unit is grounded, and the output end of the second switch unit is used as the output end of the gear control module and used for outputting control voltage to the fan interface;
the first end of the current limiting unit is also connected with the output end of the first switch unit through the third resistor unit.
5. The multi-stage direct current control circuit according to claim 4, wherein the first switching unit includes a first switching tube;
the input end of the first switch tube is used as the input end of the first switch unit, the output end of the first switch tube is used as the output end of the first switch unit, and the control end of the first switch tube is used as the control end of the first switch unit;
the second switch unit comprises a P-MOS tube;
and the source electrode of the P-MOS tube is used as the input end of the second switch unit, the grid electrode of the P-MOS tube is used as the control end of the second switch unit, and the drain electrode of the P-MOS tube is used as the output end of the second switch unit.
6. The multi-stage direct current control circuit according to claim 4, wherein the current limiting unit comprises a Schottky diode;
the cathode of the Schottky diode is used as the first end of the current limiting unit, and the anode of the Schottky diode is used as the second end of the current limiting unit.
7. The multi-stage dc control circuit of claim 1, further comprising a first magnetic bead;
the first end of the first magnetic bead is connected with the output end of the gear control module, and the second end of the first magnetic bead is used for being connected with the anode of the fan interface.
8. The multi-range direct current control circuit of claim 4, wherein the range control module further comprises a first filtering unit;
the first end of the first filtering unit is connected with the output end of the second switch unit, and the second end of the first filtering unit is grounded.
9. The multi-stage direct current control circuit according to claim 7, further comprising a second filtering unit;
the first end of the second filtering unit is connected with the second end of the first magnetic bead, and the second end of the second filtering unit is grounded.
10. The multi-stage dc control circuit of claim 7, further comprising a second magnetic bead;
the first end of the second magnetic bead is used for being connected with the negative electrode of the fan interface, and the second end of the second magnetic bead is grounded.
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| CN202210393044.XA CN114718894B (en) | 2022-04-15 | 2022-04-15 | Multi-gear direct current control circuit |
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Cited By (1)
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| CN115468314A (en) * | 2022-09-08 | 2022-12-13 | 珠海格力电器股份有限公司 | Warm-air machine gear control circuit and warm-air machine |
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| CN114718894B (en) | 2023-12-22 |
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