CN209976860U - Two-wire fan speed regulating device for detector temperature control system - Google Patents
Two-wire fan speed regulating device for detector temperature control system Download PDFInfo
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- CN209976860U CN209976860U CN201922216790.8U CN201922216790U CN209976860U CN 209976860 U CN209976860 U CN 209976860U CN 201922216790 U CN201922216790 U CN 201922216790U CN 209976860 U CN209976860 U CN 209976860U
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Abstract
The utility model discloses a two-wire fan speed regulating device for a detector temperature control system, wherein the detector comprises an upper guide rail and a lower guide rail, and three areas divided by the detector temperature control system are respectively provided with a direct current fan and a pair of temperature sensors; the detector temperature control system also comprises a single chip microcomputer and three DC/DC power supply circuits for respectively supplying power to the DC fans, wherein each DC/DC power supply circuit is provided with a feedback resistor and is used for feeding back the output voltage value of the DC/DC power supply circuit to the single chip microcomputer; each temperature sensor is connected to the singlechip, and the singlechip adjusts the output voltage of DC/DC power supply circuit through processing the received temperature information. The utility model discloses an adjust direct current fan's input voltage, realize fan speed automatically regulated, the noise and the consumption of greatly reduced equipment to through the state feedback value who acquires digital potentiometer, acquire the real-time behavior who corresponds the fan, realized the function of four-wire fan with extremely low cost.
Description
Technical Field
The utility model relates to a fan speed governing circuit technical field especially relates to a two line fan speed adjusting device for detector temperature control system.
Background
At present, large-scale medical imaging equipment generates much heat and needs heat extraction urgently, so that measures need to be taken to cool down immediately and effectively. The temperature control system mainly adopts a plurality of direct current axial flow fans to blow air or suck air on the top cover for heat dissipation of the system. The temperature control fan has a certain effect on the aspects of energy conservation and environmental protection, the working principle of the temperature control fan is that the temperature sensor is used for sensing the external temperature except for common manual gear adjustment, and the gear adjustment is carried out autonomously, so that the wind power can be adjusted autonomously according to different external temperatures without manual adjustment under the condition that the fan is turned on, and the aim of energy conservation is fulfilled.
In patent CN201811128589, an automatic voltage-changing speed-regulating circuit for a dc fan is disclosed, which comprises a dc fan and a voltage-dividing circuit; the voltage division circuit comprises a voltage division resistor and a thermistor; the thermistor with the negative temperature coefficient is connected in series in a fan coil and used as a divider resistor with adjustable resistance value along with temperature change, so that the rotating speed of the direct current fan is changed in real time along with the temperature change, the aim of regulating the speed of the fan is fulfilled, gear adjustment cannot be realized by the method, and the cost is high.
The temperature control system on a high-end product mostly adopts a four-wire direct current axial flow fan, and is provided with a PWM (pulse-width modulation) rotating speed control line and a rotating speed feedback signal line besides a power line; however, in some middle and low-end equipment, due to the cost, the fan is mainly a two-wire direct current axial flow fan, only two wires are used as power supplies, and the two-wire fan has the biggest problem that the rotating speed of the fan is uncontrollable and cannot be monitored in real time, so that the power consumption of the equipment is increased, and the environmental noise of the equipment is also increased. In addition, for some devices that require temperature control, the full power speed at the rated operating voltage lengthens the time from power-up to temperature stabilization of the device.
Disclosure of Invention
The purpose of the invention is as follows: the utility model discloses a two line fan speed adjusting device for detector temperature control system, through adjusting fan input voltage, and then adjust fan speed, greatly reduced the noise of equipment to effectively shorten the time to stable on the equipment, reduced the consumption of equipment, simultaneously through the state feedback value who acquires digital potentiometer, obtain the real-time behavior who corresponds the fan.
The technical scheme is as follows: the utility model discloses a two-wire fan speed adjusting device for a detector temperature control system, wherein the detector comprises an upper guide rail and a lower guide rail, the detector temperature control system is divided into three areas, a direct current fan and a pair of temperature sensors are arranged in each area, and the temperature sensors are respectively fixed at the upper guide rail and the lower guide rail of each area; the detector temperature control system also comprises a single chip microcomputer and three DC/DC power supply circuits for respectively supplying power to the DC fans, wherein each DC/DC power supply circuit is respectively provided with a feedback resistor, and the feedback resistors are used for feeding back the output voltage value of the DC/DC power supply circuit to the single chip microcomputer; each temperature sensor is connected to the singlechip, and the singlechip adjusts the output voltage of DC/DC power supply circuit through processing the received temperature information.
Preferably, each DC/DC power supply circuit shares MOSI, MISO and SCK clock pins of serial interface SPI of the single chip microcomputer; each DC/DC power supply circuit comprises a DC conversion chip, and a feedback resistor adopts a digital potentiometer;
an enable pin EN of the direct current conversion chip is connected with an enable signal sent by the single chip microcomputer, a switch output pin is connected with one end of a tenth inductor, and the other end of the tenth inductor is used as a voltage output end; the feedback voltage regulation pin is connected to the voltage output end through a fortieth resistor; a feedback voltage adjusting pin of the direct current conversion chip is connected with a cursor end W pin of a digital potentiometer of the digital potentiometer at the same time, a clock pin of the digital potentiometer is connected with an SCK clock pin of the single chip microcomputer, an input pin SDI of the digital potentiometer is connected with an MOSI pin of the single chip microcomputer, and an output pin SDO of the digital potentiometer is connected with an MISO pin of the single chip microcomputer.
Preferably, the single chip microcomputer is an MCU, the MCU controls the digital potentiometers of the DC/DC power circuits through a chip selection enable pin SSEL of the serial interface SPI, and the voltage value of the voltage output terminal is adjusted by setting the resistance value of the digital potentiometer.
Preferably, the DC conversion chip in the DC/DC power supply circuit is a LM76003 synchronous buck DC converter.
Preferably, the digital potentiometer is an ideno semiconductor AD5141 digital potentiometer.
Preferably, the direct current fan is an EBM6448 direct current fan.
Preferably, the model of the temperature sensor is DS18B 20.
Has the advantages that:
1. the utility model adopts the DC/DC power circuit to supply power to the fan, optimizes the design of old products, realizes the function of the 4-wire fan with extremely low cost, and greatly reduces the production cost;
2. the utility model can acquire the real-time working condition of the corresponding fan and the current working gear of the fan in real time by acquiring the state feedback value of the digital potentiometer;
3. the utility model discloses an adjust fan input voltage, and then adjust the fan speed, greatly reduced the noise of equipment to effectively shorten the power consumption of equipment and gone up the stable time, reduced the equipment.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a circuit diagram of the single DC/DC power supply of the present invention;
FIG. 3 is a pin diagram of the DC/DC converter chip LM76003 in FIG. 2;
fig. 4 is a pin diagram of the AD5141 digital potentiometer in fig. 2.
Detailed Description
The utility model relates to a two line fan speed adjusting device for detector temperature control system, the detector includes upper guideway and lower guideway, the detector temperature control system is divided equally into three regions, each region is provided with a direct current fan and a pair of temperature sensor, the temperature sensor is fixed on the upper guideway and the lower guideway of each region respectively, the model of the temperature sensor is DS18B 20; as shown in fig. 1, the temperature control system of the detector further includes a single chip microcomputer and three DC/DC power circuits for respectively supplying power to the DC fans, each DC/DC power circuit is respectively provided with a feedback resistor, and the feedback resistor is used for feeding back an output voltage value of the DC/DC power circuit to the single chip microcomputer; each temperature sensor is connected to the singlechip, and the singlechip adjusts the output voltage of DC/DC power supply circuit through processing the received temperature information.
Each DC/DC power supply circuit shares MOSI, MISO and SCK clock pins of serial interface SPI of the single chip microcomputer; each DC/DC power supply circuit comprises a DC conversion chip, and a feedback resistor adopts a digital potentiometer; an enable pin EN of the direct current conversion chip is connected with an enable signal sent by the single chip microcomputer, a switch output pin is connected with one end of a tenth inductor, and the other end of the tenth inductor is used as a voltage output end; the feedback voltage regulation pin is connected to the voltage output end through a fortieth resistor; a feedback voltage adjusting pin of the direct current conversion chip is connected with a cursor end W pin of a digital potentiometer of the digital potentiometer at the same time, a clock pin of the digital potentiometer is connected with an SCK clock pin of the single chip microcomputer, an input pin SDI of the digital potentiometer is connected with an MOSI pin of the single chip microcomputer, and an output pin SDO of the digital potentiometer is connected with an MISO pin of the single chip microcomputer. The digital potentiometer is an AD5141 digital potentiometer of a sub-Deno semiconductor, and a direct current conversion chip in the DC/DC power supply circuit is an LM76003 synchronous step-down direct current converter.
In the detector system, the direct current fan is an EBM6448 direct current fan, the working voltage range is 28V ~ 60V, the rated working voltage is 48V, and the purpose of controlling the rotating speed of the fan can be achieved by respectively adjusting the working voltage of each fan.
The utility model discloses the hardware circuit part contains the solitary DC of three routes DC power supply circuit, and every feedback resistance of the same kind all is a digital potentiometer, controls every digital potentiometer through MCU, realizes every output voltage's regulation, and three routes DC power supply circuit's output connects respectively on this example temperature control system's three EBM6448 direct current fan. In addition, the current working gear of the fan can be obtained in real time through the state feedback signal of each digital potentiometer. Can obtain the rotational speed of two line direct current fan under different operating voltage through the rotational speed tester, this scheme adopts third gear speed governing, gets 1 shelves: 30V, 2 gear: 38V, 3 rd gear: 48V.
The three fans are uniformly distributed in the detector subsystem, the detector subsystem is divided into a left temperature control area, a middle temperature control area and a right temperature control area, and the upper guide rail and the lower guide rail of the detector are respectively uniformly distributed with three temperature sensors, namely, each fan corresponds to the two temperature sensors of the upper guide rail and the lower guide rail of the detector. In order to prevent the fan rotating speed from changing repeatedly at the speed changing point, the temperature return difference is set to be 1 ℃, and the approximate speed regulating strategy is as follows:
(a) and (3) an upshift strategy:
the temperature sensor of the guide rail (any one) is less than or equal to 43 ℃, the fan is in 1-gear (the input voltage is 30V)
43 ℃ lower than the temperature sensor of the guide rail (any one) is less than or equal to 45 ℃ fan is 2-gear (input voltage 38V)
Guide rail temperature sensor (any one) >45 ℃ fan is 3-gear (input voltage 48V)
(b) And (3) a downshift strategy:
the temperature sensor of the guide rail (each) is less than or equal to 42 ℃, the fan is in 1 gear (the input voltage is 30V)
42 ℃ and less than or equal to 44 ℃ of guide rail temperature sensors (each) and 2 gears of fan (input voltage 38V)
FIG. 2 shows a single DC/DC power supply circuit, sharing the MOSI, MISO and SCK pins of SPI, MCU controls the digital potentiometer of each DC/DC power supply circuit through the chip selection enable pin SSEL of serial interface SPI, and the regulation of the fan working voltage can be realized by setting the resistance of the digital potentiometer. And the MCU performs fan speed regulation based on the two temperature sensor values of the corresponding temperature control area of the fan.
The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (7)
1. A two-wire fan speed adjusting device for a detector temperature control system is characterized in that: the detector comprises an upper guide rail and a lower guide rail, a temperature control system of the detector is divided into three areas, a direct current fan and a pair of temperature sensors are arranged in each area, and the temperature sensors are respectively fixed at the upper guide rail and the lower guide rail of each area; the detector temperature control system also comprises a single chip microcomputer and three DC/DC power supply circuits for respectively supplying power to the DC fans, wherein each DC/DC power supply circuit is respectively provided with a feedback resistor, and the feedback resistors are used for feeding back the output voltage value of the DC/DC power supply circuit to the single chip microcomputer; each temperature sensor is connected to the singlechip, and the singlechip adjusts the output voltage of DC/DC power supply circuit through processing the received temperature information.
2. The two-wire fan governor device for a probe temperature control system of claim 1, wherein: the DC/DC power supply circuits share MOSI, MISO and SCK clock pins of a serial interface SPI of the single chip microcomputer; each DC/DC power supply circuit comprises a DC conversion chip, and a feedback resistor adopts a digital potentiometer;
an enable pin EN of the direct current conversion chip receives an enable signal sent by the single chip microcomputer, a switch output pin is connected with one end of a tenth inductor, and the other end of the tenth inductor is used as a voltage output end; the feedback voltage regulation pin is connected to the voltage output end through a fortieth resistor; a feedback voltage adjusting pin of the direct current conversion chip is connected with a cursor end W pin of a digital potentiometer of the digital potentiometer at the same time, a clock pin of the digital potentiometer is connected with an SCK clock pin of the single chip microcomputer, an input pin SDI of the digital potentiometer is connected with an MOSI pin of the single chip microcomputer, and an output pin SDO of the digital potentiometer is connected with an MISO pin of the single chip microcomputer.
3. A two wire fan governor device for a probe temperature control system according to claim 2, wherein: the single chip microcomputer is an MCU, the MCU controls digital potentiometers of the DC/DC power supply circuits through a chip selection enabling pin SSEL of the serial interface SPI, and the voltage value of the voltage output end is adjusted through setting the resistance value of the digital potentiometers.
4. A two wire fan governor device for a probe temperature control system according to claim 2, wherein: and a direct current conversion chip in the DC/DC power supply circuit is an LM76003 synchronous buck direct current converter.
5. A two wire fan governor device for a probe temperature control system according to claim 2, wherein: the digital potentiometer is an Asia-Dryno semiconductor AD5141 digital potentiometer.
6. The two-wire fan governor device for a probe temperature control system of claim 1, wherein: the direct current fan is an EBM6448 direct current fan.
7. The two-wire fan governor device for a probe temperature control system of claim 1, wherein: the model of the temperature sensor is DS18B 20.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922216790.8U CN209976860U (en) | 2019-12-12 | 2019-12-12 | Two-wire fan speed regulating device for detector temperature control system |
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| CN201922216790.8U CN209976860U (en) | 2019-12-12 | 2019-12-12 | Two-wire fan speed regulating device for detector temperature control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112181010A (en) * | 2020-09-23 | 2021-01-05 | 普联国际有限公司 | Temperature control method and device of router, storage medium and router |
| CN114421833A (en) * | 2022-03-29 | 2022-04-29 | 浙江齐安信息科技有限公司 | Control device for two-wire DC fan |
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2019
- 2019-12-12 CN CN201922216790.8U patent/CN209976860U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112181010A (en) * | 2020-09-23 | 2021-01-05 | 普联国际有限公司 | Temperature control method and device of router, storage medium and router |
| CN114421833A (en) * | 2022-03-29 | 2022-04-29 | 浙江齐安信息科技有限公司 | Control device for two-wire DC fan |
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