CN211397978U - Multi-fan control circuit - Google Patents
Multi-fan control circuit Download PDFInfo
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- CN211397978U CN211397978U CN201921871621.1U CN201921871621U CN211397978U CN 211397978 U CN211397978 U CN 211397978U CN 201921871621 U CN201921871621 U CN 201921871621U CN 211397978 U CN211397978 U CN 211397978U
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Abstract
A multi-fan control circuit comprises a controller, a plurality of rotating speed sensors, a multi-path motor driving circuit, a multiplexer and a serial-parallel conversion circuit. The input ends of the multiplexer are respectively connected with the output ends of the plurality of rotating speed sensors, the output end of the multiplexer is connected with the first IO port of the controller, and the multiplexer is used for transmitting the rotating speed detection signals received by the input ends to the output end of the multiplexer in a time-sharing mode. The input end of the serial-parallel conversion circuit is connected with a second IO port of the controller, and a plurality of output ends are respectively connected with the input ends of the multi-path motor driving circuits; the serial-parallel conversion circuit is used for converting serial signals received by the input end of the serial-parallel conversion circuit into parallel signals and respectively transmitting the parallel signals to a plurality of output ends of the serial-parallel conversion circuit. The controller is respectively connected with the multiplexer and the control end of the serial-parallel conversion circuit. The utility model discloses realized the collection to the rotational speed information of a plurality of fans and the drive control to a plurality of fans with less controller IO mouth.
Description
Technical Field
The utility model relates to a heat dissipation technology especially relates to fan control circuit.
Background
The abnormal work of the fan can cause poor heat dissipation of the product, and further the working stability of the product is influenced. Therefore, the controller needs to collect the rotation speed information of the fan to monitor the working condition of the fan in real time. In the existing multi-fan control circuit, the rotational speed sensor of each fan occupies one path of IO port of the controller, so that the acquisition of the rotational speed signals of the fan by the controller can be realized, and when the number of the fans is large, a large amount of IO port resources of the controller can be occupied, and further the connection of the controller and other peripheral products is influenced.
Disclosure of Invention
The utility model aims to solve the technical problem that a many fans control circuit is provided, it can realize the collection to the rotational speed information of a plurality of fans and the drive control to a plurality of fans with less controller IO mouth to save the IO mouth resource of controller.
The embodiment of the utility model provides a many fans control circuit, including controller, a plurality of speed sensor and multichannel motor drive circuit, a plurality of speed sensor are used for detecting the rotational speed of a plurality of fans respectively one-to-one, and multichannel motor drive circuit is used for driving the motor of a plurality of fans respectively one-to-one, and its characteristics are that many fans control circuit includes multiplexer and cluster conversion circuit; the multiplexer has a plurality of input terminals, an output terminal and a control terminal; the input ends of the multiplexer are respectively connected with the output ends of the plurality of rotating speed sensors in a one-to-one correspondence manner, the output end of the multiplexer is connected with a first IO port of the controller, and the multiplexer is used for transmitting rotating speed detection signals received by the input ends of the multiplexer to the output end of the multiplexer in a time-sharing manner; the serial-parallel conversion circuit comprises an input end, a control end and a plurality of output ends; the input end of the serial-parallel conversion circuit is connected with the second IO port of the controller, and a plurality of output ends of the serial-parallel conversion circuit are respectively connected with the input ends of the multi-path motor driving circuits; the serial-parallel conversion circuit is used for converting serial signals received by the input end of the serial-parallel conversion circuit into parallel signals and respectively transmitting the parallel signals to a plurality of output ends of the serial-parallel conversion circuit; the controller is respectively connected with the control end of the multiplexer and the control end of the serial-parallel conversion circuit.
The utility model discloses following advantage and characteristics have at least:
the embodiment of the utility model provides a multiplexer and cluster parallel conversion circuit have been set up, through multiplexer with the rotational speed detected signal time-sharing multiplexing of a plurality of fans to the IO mouth all the way of controller, through cluster parallel conversion circuit with the controller send fan drive signal conversion of the same kind of fan drive signal be multichannel fan drive signal, thereby realized the collection to the rotational speed information of a plurality of fans and to the drive control of a plurality of fans with less controller IO mouth, saved the IO mouth resource of controller.
Drawings
Fig. 1 shows a schematic block diagram of a multi-fan control circuit according to an embodiment of the present invention.
Fig. 2 shows a schematic circuit diagram of a motor driving circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Please refer to fig. 1 and fig. 2. According to the utility model discloses a many fans control circuit of embodiment, including controller 1, a plurality of speed sensor 2, multichannel motor drive circuit 3, multiplexer 4 and series-parallel conversion circuit 5.
The plurality of rotation speed sensors 2 are used for respectively detecting the rotation speeds of the plurality of fans M in a one-to-one correspondence manner, and the output ends of the multi-path motor driving circuit 3 are respectively connected with the motors M of the plurality of fans and are used for respectively driving the motors M of the plurality of fans in a one-to-one correspondence manner. Fig. 2 schematically shows the structure of a motor drive circuit. As shown in fig. 2, the motor drive circuit 3 includes a first resistor R1, a second resistor R2, a capacitor C1, an NMOS transistor Q1, and a freewheeling diode D1. One end of a first resistor R1 is connected with the output end of the serial-parallel conversion circuit 5, the grid of an NMOS tube Q1 is respectively connected with the other end of the first resistor R1, one end of a second resistor R2 and one end of a capacitor C1, the source of the NMOS tube Q1, the other end of the second resistor R2 and the other end of the capacitor C1 are grounded, the drain of the NMOS tube Q1 is respectively connected with the anode of a freewheeling diode D1 and the motor M, the cathode of the freewheeling diode D1 is connected with a power supply VIN, and the freewheeling diode D1 is connected with the motor M in parallel.
The multiplexer 4 has a plurality of input terminals, an output terminal and a control terminal. A plurality of input ends of the multiplexer 4 are respectively connected with the output ends of the plurality of rotation speed sensors 2 in a one-to-one correspondence manner, the output end of the multiplexer 4 is connected with the first IO port of the controller 1, and the multiplexer 4 is used for transmitting rotation speed detection signals received by the plurality of input ends of the multiplexer to the output end of the multiplexer in a time-sharing manner, and then outputting the rotation speed detection signals to the controller 1.
The serial-to-parallel conversion circuit 5 includes an input terminal, a control terminal, and a plurality of output terminals. The input end of the serial-parallel conversion circuit 5 is connected with a second IO port of the controller 1, and a plurality of output ends of the serial-parallel conversion circuit 5 are respectively connected with the input ends of the multi-path motor driving circuits 3; the serial-parallel conversion circuit 5 is configured to convert a serial signal received by an input end of the serial-parallel conversion circuit 5 into a parallel signal and transmit the parallel signal to a plurality of output ends of the serial-parallel conversion circuit 5, so as to control the multi-path motor driving circuit 3 to drive the motors M of the plurality of fans. In the present embodiment, the serial signal output from the controller 1 to the serial-to-parallel conversion circuit 5 is a PWM signal, and the PWM signal can control the rotation speed of the fan motor.
The controller 1 is connected to a control terminal of the multiplexer 4 and a control terminal of the serial-to-parallel conversion circuit 5, respectively. In this embodiment, the control terminal of the multiplexer 4 and the control terminal of the serial-to-parallel conversion circuit 5 are both connected to the third IO port of the controller 1, and this connection method has an advantage that one IO port can be saved. In other embodiments, the control terminal of the multiplexer 4 and the control terminal of the serial-parallel conversion circuit 5 may be connected to two different IO ports of the controller 1, respectively.
In this embodiment, the controller 1 is an MCU. The multiplexer 4 is a multiplexer chip of type 74LVC1G157 manufactured by seian semiconductor corporation. The serial-parallel conversion circuit 5 is a shift register, and a clock end of the shift register forms a control end of the serial-parallel conversion circuit. In other embodiments, the serial-to-parallel conversion circuit 5 may also employ an adder chip.
In the example of fig. 1, the number of fans (equal to the number of fan motors M) controlled by the controller 1 is four, and the number of inputs of the multiplexer 4 and the number of outputs of the serial-parallel conversion circuit 5 are four. In other application examples, the number of the fans controlled by the controller 1 may also be five, six, and the like, and accordingly, the number of the input terminals of the multiplexer 4 and the number of the output terminals of the serial-parallel conversion circuit 5 are also five, six, and the like, which is not limited by the present invention. During operation, when the control end of the multiplexer 4 receives a control signal sent by the third IO port of the controller 1, the rotation speed detection signals received by the four input ends are sequentially transmitted to the output end of the multiplexer 4 in a time-sharing manner, and then are output to the first IO port of the controller 1, so that the collection of the rotation speed detection signals of the four rotation speed sensors 2 by the controller 1 is completed, and when the clock end of the shift register receives the control signal sent by the third IO port of the controller 1, the serial PWM signals sent by the second IO port of the controller 1 are converted into parallel PWM signals and are respectively transmitted to the four output ends of the shift register, so that the four-way motor driving circuit 3 is controlled to drive the motors M of the four fans. Therefore, the utility model discloses realize the collection to the rotational speed information of a plurality of fans and to the drive control of a plurality of fans with less controller IO mouth, saved the IO mouth resource of controller.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. A multi-fan control circuit comprises a controller, a plurality of rotating speed sensors and a plurality of paths of motor driving circuits, wherein the rotating speed sensors are used for respectively detecting the rotating speeds of a plurality of fans in a one-to-one correspondence mode;
the multiplexer has a plurality of input terminals, an output terminal and a control terminal; the input ends of the multiplexer are respectively connected with the output ends of the plurality of rotating speed sensors in a one-to-one correspondence manner, the output end of the multiplexer is connected with the first IO port of the controller, and the multiplexer is used for transmitting the rotating speed detection signals received by the input ends of the multiplexer to the output end of the multiplexer in a time-sharing manner;
the serial-parallel conversion circuit comprises an input end, a control end and a plurality of output ends; the input end of the serial-parallel conversion circuit is connected with a second IO port of the controller, and a plurality of output ends of the serial-parallel conversion circuit are respectively connected with the input ends of the multi-path motor driving circuits; the serial-parallel conversion circuit is used for converting serial signals received by the input end of the serial-parallel conversion circuit into parallel signals and respectively transmitting the parallel signals to a plurality of output ends of the serial-parallel conversion circuit;
and the controller is respectively connected with the control end of the multiplexer and the control end of the serial-parallel conversion circuit.
2. The multi-fan control circuit of claim 1, wherein the control terminal of the multiplexer and the control terminal of the serial-to-parallel conversion circuit are both connected to a third IO port of the controller.
3. The multi-fan control circuit of claim 1 or 2, wherein the multiplexer is a multiplexer chip model 74LVC1G157 manufactured by seian semiconductor corporation.
4. The multi-fan control circuit of claim 1, wherein the serial-to-parallel conversion circuit is a shift register.
5. The multi-fan control circuit of claim 1, wherein the controller is an MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921871621.1U CN211397978U (en) | 2019-11-01 | 2019-11-01 | Multi-fan control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921871621.1U CN211397978U (en) | 2019-11-01 | 2019-11-01 | Multi-fan control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211397978U true CN211397978U (en) | 2020-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921871621.1U Active CN211397978U (en) | 2019-11-01 | 2019-11-01 | Multi-fan control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211397978U (en) |
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2019
- 2019-11-01 CN CN201921871621.1U patent/CN211397978U/en active Active
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