CN213542790U - Air inlet air conditioner control circuit - Google Patents
Air inlet air conditioner control circuit Download PDFInfo
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- CN213542790U CN213542790U CN202022013547.9U CN202022013547U CN213542790U CN 213542790 U CN213542790 U CN 213542790U CN 202022013547 U CN202022013547 U CN 202022013547U CN 213542790 U CN213542790 U CN 213542790U
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Abstract
The utility model provides an air inlet air conditioner control circuit, which comprises an MCU, an air quantity detection sub-circuit, a plurality of valve control sub-circuits, a temperature and humidity pressure detection sub-circuit and a fan driving sub-circuit; the input end of the air quantity detection sub-circuit is fixedly arranged at the air inlet and the air outlet of the air-conditioning box; the valve of a water supply pipe of the surface cooler and the air valve are both provided with a valve control sub-circuit, and the input end of the valve control sub-circuit is electrically connected with the GPIO port of the MCU; temperature and humidity pressure detection sub-circuits are arranged at the air inlet and the air outlet of the air conditioning box and on a water supply pipe of the surface air cooler, and the output ends of the temperature and humidity pressure detection sub-circuits are electrically connected with GPIO ports of the MCU; the fan driving sub-circuit is arranged on the fan, the input end of the fan driving sub-circuit is electrically connected with the GPIO port of the MCU, and the output end of the fan driving sub-circuit is electrically connected with the input end of the fan; the MCU drives the fan to rotate through the fan driving sub-circuit.
Description
Technical Field
The utility model relates to an automobile engine performance check out test set technical field especially relates to an air conditioner control circuit admits air.
Background
The environmental test cabin of the automobile engine adopts proper ventilation equipment to meet the requirements of test items such as power matching, economic performance matching, low-temperature performance, emission performance and the like which accord with emission regulations after heat preservation and heat insulation treatment according to the working state of the engine test. The working temperature range of the environmental test chamber of the automobile engine is-40 ℃ to 60 ℃.
As shown in fig. 1, an air inlet air conditioning device of an automobile engine environmental test chamber is generally equipped with an air conditioning chamber, components such as a surface cooler, a heater, a humidifier, a fan, an air valve and the like are sequentially arranged in the air conditioning chamber, air entering the air conditioning chamber is respectively cooled, dehumidified, dried, dehumidified, adjusted to be appropriate and humidity is sent to the test chamber to simulate the running environment of an engine or a whole automobile, and the air valve can be opened as required. In the test process, the reliability, the accuracy and the timeliness of detection can be ensured only by very timely and accurately feeding back various working conditions of the air inlet air conditioner.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a rational in infrastructure, have position feedback, air conditioner control circuit admits air that the reliability is high.
The technical scheme of the utility model is realized like this: the utility model provides an air inlet air conditioner control circuit, which comprises an air conditioning box, wherein an air inlet and an air outlet are respectively arranged at the two ends of the air conditioning box, a surface cooler, a heater, a humidifier and a fan are sequentially arranged in the air conditioning box, the output end of the fan is respectively communicated with the air inlet end of the air outlet and an air inlet end of an air valve, and the air outlet end of the air valve is communicated with the air inlet end of the surface cooler; the air quantity detection sub-circuit is connected with the air quantity detection sub-circuit through the valve control sub-circuit; wherein
The input end of the air quantity detection sub-circuit is fixedly arranged at the air inlet and the air outlet of the air conditioner box, and the output end of the air quantity detection sub-circuit is electrically connected with the GPIO port of the MCU;
the valve of a water supply pipe of the surface cooler and the air valve are both provided with a valve control sub-circuit, and the input end of the valve control sub-circuit is electrically connected with the GPIO port of the MCU; the output end of the valve control sub-circuit is electrically connected with the valve of the water supply pipe and the air valve; the valve control sub-circuit selectively opens or closes the valve or the air valve;
temperature and humidity pressure detection sub-circuits are arranged at the air inlet and the air outlet of the air conditioning box and on a water supply pipe of the surface air cooler, and the output ends of the temperature and humidity pressure detection sub-circuits are electrically connected with GPIO ports of the MCU; the temperature and humidity pressure detection sub-circuit detects the temperature and humidity of air entering and discharging the air conditioning box and the water temperature and the water pressure in the water supply pipe of the surface air cooler;
the fan driving sub-circuit is arranged on the fan, the input end of the fan driving sub-circuit is electrically connected with the GPIO port of the MCU, and the output end of the fan driving sub-circuit is electrically connected with the input end of the fan; the MCU drives the fan to rotate through the fan driving sub-circuit.
On the basis of the above technical solution, preferably, the air volume detecting sub-circuit includes an air volume detecting sensor U1 and a voltage conversion chip U2, the air volume detecting sensor U1 detects air volume signals of an air inlet and an air outlet of the air conditioning cabinet, and outputs a current signal to an input end of the voltage conversion chip U2, the voltage conversion chip U2 converts the current signal into a voltage signal, and then divides the voltage by a voltage dividing circuit composed of resistors R1 and R2 to obtain a voltage signal conforming to the MCU input voltage level, and then inputs the voltage signal into a GPIO port of the MCU having an ADC function.
Preferably, the valve control sub-circuit comprises a valve driving unit U3 and a plurality of stepping motors M, the input end and the enable end of the valve driving unit U3 are both electrically connected with the GPIO port of the MCU, and the output end of the valve driving unit U3 is electrically connected with the input end of the stepping motor M; the stepping motor M rotates forward and backward to drive a valve of a water supply pipe of the surface cooler and an air valve to be opened or closed.
Still further preferably, the output shaft of the stepping motor M is further provided with photoelectric encoders U4 and U5, and the output ends of the photoelectric encoders U4 and U5 are directly electrically connected with the GPIO port of the MCU.
More preferably, the valve driving unit U3 is L298N, the pin 5, the pin 7, the pin 10 and the pin 12 of the valve driving unit U3 are respectively and correspondingly electrically connected with the ports PB 1-PB 4 of the MCU, the output ends OUT1 and OUT2 of the valve driving unit U3 are both electrically connected with the input end of the stepping motor M1, and the output ends OUT3 and OUT4 are both electrically connected with the input end of another stepping motor M2; each output end is also connected with a voltage stabilizing diode in parallel; the photoelectric encoders U4 and U5 output rotation angle signals of the stepping motors M1 or M2 to the MCU as feedback signals of the stepping motors M1 and M2.
Further preferably, the temperature and humidity pressure detection sub-circuit comprises a plurality of pressure sensors U6, a temperature and humidity sensor U7 and a multi-channel analog multiplexer U8; the pressure sensor U6 and the temperature and humidity sensor U7 are respectively arranged at an air inlet and an air outlet of the air conditioning box and in a water supply pipe of the surface cooler; the output ends of the pressure sensor U6 and the temperature and humidity sensor U7 are respectively electrically connected with the input end of the multichannel analog multiplexer U8, and the enabling end, the input selection end and the common output end of the multichannel analog multiplexer U8 are electrically connected with the GPIO port of the MCU; the multichannel analog multiplexer U8 is selectively communicated with each input end, so that the output signals of the corresponding pressure sensor U6 or temperature and humidity sensor U7 are input into the MCU through the common output end.
More preferably, the pressure sensor U6 is PTX1400C, the temperature and humidity sensor U7 is HMD40Y, and the multichannel analog multiplexer U8 is AD 7501; signals output by the pressure sensor U6 or the temperature and humidity sensor U7 are input into an input end of the multichannel analog multiplexer U8 after being subjected to current-voltage conversion.
Preferably, the fan driving sub-circuit comprises a fan driving chip U9 and a fan U10, the input end of the fan driving chip U9 is electrically connected to the GPIO port of the MCU, and the output end of the fan driving chip U9 is electrically connected to the input end of the fan U10; the pin 17 of the fan driving chip U9 is a working voltage input end, and the voltage input end is further electrically connected with the GPIO port of the MCU through a voltage feedback loop.
Still further preferably, the voltage feedback loop comprises a series voltage dividing unit and a parallel voltage dividing unit, the series voltage dividing unit comprises resistors R5, R6, R7 and R8, the resistors are sequentially connected in series, the resistor R5 is further electrically connected with the input end of the parallel voltage dividing unit, and the resistor R8 is electrically connected with a pin 17 of a fan driving chip U9; the parallel voltage division unit comprises a resistor R9 and a resistor R10, one end of the resistor R9 is connected with one end of the resistor R5 and one end of the resistor R10 in parallel, the other end of the resistor R9 is connected with a GPIO port of the MCU, wherein the GPIO port is provided with an ADC port, and the other end of the resistor R10 is grounded.
The utility model provides a pair of air conditioner control circuit admits air for prior art, has following beneficial effect:
(1) the MCU can efficiently realize detection, switching and feedback aiming at the air inlet amount, the air inlet temperature and humidity, the valve opening, the temperature and humidity and pressure of inlet water and the opening and rotating speed control of a fan, and can better realize the state regulation of the inlet air conditioner on air sent into an engine;
(2) the air quantity detection sub-circuit converts the detected weak current signal and outputs a voltage signal which accords with the voltage grade of the MCU so as to facilitate the subsequent AD conversion;
(3) the valve control sub-circuit can control the stepping motor to adjust the opening of the valve to realize the opening and closing of the valve, and the angle change of the rotating shaft of the stepping motor is fed back to the MCU to realize the real-time detection of the rotating position of the valve so as to form closed-loop control;
(4) the temperature and humidity pressure detection sub-circuit detects the temperature and humidity of the air before and after treatment and the temperature and humidity and water pressure of the water inlet pipe of the surface cooler in real time, so that the air dehumidification effect is better guaranteed;
(5) the fan driving sub-circuit can drive a high-power fan to operate reliably by using a small signal of the MCU, acquire a detection signal of the input voltage of the fan and calculate the output power of the fan correspondingly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of an intake air conditioner;
fig. 2 is a block diagram of a control circuit of an air intake air conditioner according to the present invention;
fig. 3 is a wiring diagram of an air volume detecting sub-circuit of the intake air conditioner control circuit of the present invention;
fig. 4 is a wiring diagram of a valve control sub-circuit of the intake air conditioner control circuit of the present invention;
fig. 5 is a wiring diagram of the temperature, humidity and pressure detection sub-circuit of the intake air conditioner control circuit of the present invention;
fig. 6 is a wiring diagram of the fan driving sub-circuit of the control circuit of the air-intake air conditioner of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
As shown in fig. 1 and fig. 2, the technical solution of the present invention is realized as follows: the utility model provides an air inlet air conditioner control circuit, which comprises an air conditioning box, wherein an air inlet and an air outlet are respectively arranged at the two ends of the air conditioning box, a surface cooler, a heater, a humidifier and a fan are sequentially arranged in the air conditioning box, the output end of the fan is respectively communicated with the air inlet end of the air outlet and an air inlet end of an air valve, and the air outlet end of the air valve is communicated with the air inlet end of the surface cooler; the air quantity detection sub-circuit is connected with the air quantity detection sub-circuit through the valve control sub-circuit; wherein
The input end of the air quantity detection sub-circuit is fixedly arranged at the air inlet and the air outlet of the air conditioner box, and the output end of the air quantity detection sub-circuit is electrically connected with the GPIO port of the MCU; the air volume detection sub-circuit can detect air volume signals entering the air conditioning box and discharged from the air conditioning box and input the air volume signals into the MCU for further processing.
The valve of a water supply pipe of the surface cooler and the air valve are both provided with a valve control sub-circuit, and the input end of the valve control sub-circuit is electrically connected with the GPIO port of the MCU; the output end of the valve control sub-circuit is electrically connected with the valve of the water supply pipe and the air valve; the valve control sub-circuit selectively opens or closes the valve or the air valve to realize the adjustment of the output air quantity or the water supply quantity.
Temperature and humidity pressure detection sub-circuits are arranged at the air inlet and the air outlet of the air conditioning box and on a water supply pipe of the surface air cooler, and the output ends of the temperature and humidity pressure detection sub-circuits are electrically connected with GPIO ports of the MCU; the temperature and humidity pressure detection sub-circuit detects the temperature and humidity of air entering and discharging the air conditioning box and the water temperature and the water pressure in the water supply pipe of the surface air cooler; the temperature and humidity pressure detection sub-circuit can detect the temperature and humidity of air before and after treatment, and can detect the water temperature and the water pressure of cooling water fed into the surface cooler, so that a reliable air dehumidification effect is ensured.
The fan driving sub-circuit is arranged on the fan, the input end of the fan driving sub-circuit is electrically connected with the GPIO port of the MCU, and the output end of the fan driving sub-circuit is electrically connected with the input end of the fan; the MCU drives the fan to rotate through the fan driving sub-circuit.
As shown in fig. 3, the air volume detecting sub-circuit includes an air volume detecting sensor U1 and a voltage converting chip U2, the air volume detecting sensor U1 detects air volume signals of the air inlet and the air outlet of the air-conditioning box, and outputs current signals to the input end of the voltage converting chip U2, the voltage converting chip U2 converts the current signals into voltage signals, and then the voltage signals are divided by a voltage dividing circuit composed of resistors R1 and R2 to obtain voltage signals conforming to the input voltage level of the MCU, and then the voltage signals are input into the GPIO port of the MCU having the ADC function. The wind speed detection sensor U1 detects a wind speed signal, a pin 2 outputs a 4-20 mA direct current signal to a pin 3 of a voltage conversion chip U2, the voltage conversion chip U2 is RCV420AGEE, the 4-20 mA direct current signal is changed into a 0.3-1.5V voltage signal and then is amplified and output to be 0-5V output, the voltage signal is divided by resistors R1 and R2 to obtain a 0-3.3V voltage signal which is input to an ADC port of the MCU, and the MCU further calculates to obtain wind speed.
As shown in fig. 4, the valve control sub-circuit includes a valve driving unit U3 and a plurality of stepping motors M, an input end and an enable end of the valve driving unit U3 are both electrically connected to the GPIO port of the MCU, and an output end of the valve driving unit U3 is electrically connected to an input end of the stepping motor M; the stepping motor M rotates forward and backward to drive a valve of a water supply pipe of the surface cooler and an air valve to be opened or closed.
The output shaft of the stepping motor M is also provided with photoelectric encoders U4 and U5, and the output ends of the photoelectric encoders U4 and U5 are directly electrically connected with the GPIO port of the MCU.
Specifically, the valve driving unit U3 is L298N, a pin 5, a pin 7, a pin 10 and a pin 12 of the valve driving unit are respectively electrically connected with PB 1-PB 4 ports of the MCU in a one-to-one correspondence manner, output ends OUT1 and OUT2 of the valve driving unit U3 are both electrically connected with an input end of a stepping motor M1, and output ends OUT3 and OUT4 are both electrically connected with an input end of another stepping motor M2; each output end is also connected with a voltage stabilizing diode in parallel; the photoelectric encoders U4 and U5 output rotation angle signals of the stepping motors M1 or M2 to the MCU as feedback signals of the stepping motors M1 and M2. The present embodiment corresponds to two motors M, i.e., M1 and M2. The photoelectric encoders U4 and U5 are used for detecting positive and negative rotation angle displacement of output shafts of the stepping motors M1 and M2 correspondingly, so that the MCU is used for acquiring opening angles of a valve of a water supply pipe and an air valve of a corresponding surface cooler, and a flow adjusting function is realized. In order to ensure the stability of the input voltage of the stepping motor, the output end of each valve driving unit U3 is connected with two diodes in parallel, so that the purpose of voltage stabilization is achieved.
As shown in fig. 5, the temperature and humidity pressure detection sub-circuit includes a plurality of pressure sensors U6, a temperature and humidity sensor U7, and a multi-channel analog multiplexer U8; the pressure sensor U6 and the temperature and humidity sensor U7 are respectively arranged at an air inlet and an air outlet of the air conditioning box and in a water supply pipe of the surface cooler; the output ends of the pressure sensor U6 and the temperature and humidity sensor U7 are respectively electrically connected with the input end of the multichannel analog multiplexer U8, and the enabling end, the input selection end and the common output end of the multichannel analog multiplexer U8 are electrically connected with the GPIO port of the MCU; the multichannel analog multiplexer U8 is selectively communicated with each input end, so that the output signals of the corresponding pressure sensor U6 or temperature and humidity sensor U7 are input into the MCU through the common output end.
The utility model discloses a pressure sensor U6 is PTX1400C, temperature and humidity sensor U7 is HMD40Y, multichannel analog multiplexer U8 is AD 7501; signals output by the pressure sensor U6 or the temperature and humidity sensor U7 are input into an input end of the multichannel analog multiplexer U8 after being subjected to current-voltage conversion. In order to save system overhead, the MCU uses a polling mode to provide different high and low levels to the input selection terminals a0, a1 and a2 of the multi-channel analog multiplexer U8, so as to realize function switching of at most 8-channel selection, obtain input signals from the pressure sensor U6 and the temperature and humidity sensor U7, and perform AD conversion.
As shown in fig. 6, the fan driving sub-circuit includes a fan driving chip U9 and a fan U10, an input end of the fan driving chip U9 is electrically connected to a GPIO port of the MCU, and an output end of the fan driving chip U9 is electrically connected to an input end of the fan U10; the pin 17 of the fan driving chip U9 is a working voltage input end, and the voltage input end is further electrically connected with the GPIO port of the MCU through a voltage feedback loop.
In order to better monitor the fluctuation condition of the working voltage of the fan driving chip U9, the voltage feedback loop comprises a series voltage division unit and a parallel voltage division unit, the series voltage division unit comprises resistors R5, R6, R7 and R8, the resistors are sequentially connected in series, the resistor R5 is also electrically connected with the input end of the parallel voltage division unit, and the resistor R8 is electrically connected with a pin 17 of the fan driving chip U9; the parallel voltage division unit comprises a resistor R9 and a resistor R10, one end of the resistor R9 is connected with one end of the resistor R5 and one end of the resistor R10 in parallel, the other end of the resistor R9 is connected with a GPIO port of the MCU, wherein the GPIO port is provided with an ADC port, and the other end of the resistor R10 is grounded.
The utility model discloses a fan driver chip U9 is SD02M50 DBEE, for three-phase full bridge drive circuit. In order to further monitor the current of the fan, a connection wire is led out from a pin 19 and a pin 20 of the fan driving chip U9, and the connection wire is input into the MCU after voltage amplification and voltage following, so as to realize current detection.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An air inlet air conditioner control circuit comprises an air conditioner box, wherein an air inlet and an air outlet are respectively arranged at two ends of the air conditioner box, a surface cooler, a heater, a humidifier and a fan are sequentially arranged in the air conditioner box, the output end of the fan is respectively communicated with the air outlet and the air inlet end of an air valve, and the air outlet end of the air valve is communicated with the air inlet end of the surface cooler; the method is characterized in that: the air quantity detection sub-circuit is connected with the air quantity detection sub-circuit through the valve control sub-circuit;
the input end of the air quantity detection sub-circuit is fixedly arranged at the air inlet and the air outlet of the air conditioner box, and the output end of the air quantity detection sub-circuit is electrically connected with the GPIO port of the MCU;
the valve of a water supply pipe of the surface cooler and the air valve are both provided with a valve control sub-circuit, and the input end of the valve control sub-circuit is electrically connected with the GPIO port of the MCU; the output end of the valve control sub-circuit is electrically connected with the valve of the water supply pipe and the air valve; the valve control sub-circuit selectively opens or closes the valve or the air valve;
temperature and humidity pressure detection sub-circuits are arranged at the air inlet and the air outlet of the air conditioning box and on a water supply pipe of the surface air cooler, and the output ends of the temperature and humidity pressure detection sub-circuits are electrically connected with GPIO ports of the MCU; the temperature and humidity pressure detection sub-circuit detects the temperature and humidity of air entering and discharging the air conditioning box and the water temperature and the water pressure in the water supply pipe of the surface air cooler;
the fan driving sub-circuit is arranged on the fan, the input end of the fan driving sub-circuit is electrically connected with the GPIO port of the MCU, and the output end of the fan driving sub-circuit is electrically connected with the input end of the fan; the MCU drives the fan to rotate through the fan driving sub-circuit.
2. The intake air conditioning control circuit of claim 1, wherein: the air volume detection sub-circuit comprises an air volume detection sensor U1 and a voltage conversion chip U2, the air volume detection sensor U1 detects air volume signals of an air inlet and an air outlet of the air conditioner box and outputs current signals to the input end of the voltage conversion chip U2, the voltage conversion chip U2 converts the current signals into voltage signals, then voltage division is carried out by a voltage division circuit consisting of resistors R1 and R2, voltage signals meeting the input voltage level of the MCU are obtained, and then the voltage signals are input into a GPIO port of the MCU with the function of the ADC.
3. The intake air conditioner control circuit as claimed in claim 2, wherein: the valve control sub-circuit comprises a valve driving unit U3 and a plurality of stepping motors M, wherein the input end and the enabling end of the valve driving unit U3 are both electrically connected with the GPIO port of the MCU, and the output end of the valve driving unit U3 is electrically connected with the input end of the stepping motor M; the stepping motor M rotates forward and backward to drive a valve of a water supply pipe of the surface cooler and an air valve to be opened or closed.
4. A control circuit for an air intake air conditioner as claimed in claim 3, wherein: and the output shaft of the stepping motor M is also provided with photoelectric encoders U4 and U5, and the output ends of the photoelectric encoders U4 and U5 are directly electrically connected with the GPIO port of the MCU.
5. The intake air conditioning control circuit of claim 4, wherein: the valve driving unit U3 is L298N, a pin 5, a pin 7, a pin 10 and a pin 12 of the valve driving unit are respectively and correspondingly electrically connected with ports PB 1-PB 4 of the MCU, an output end OUT1 and an output end OUT2 of the valve driving unit U3 are both electrically connected with an input end of a stepping motor M1, and an output end OUT3 and an output end OUT4 are both electrically connected with an input end of another stepping motor M2; each output end is also connected with a voltage stabilizing diode in parallel; the photoelectric encoders U4 and U5 output rotation angle signals of the stepping motors M1 or M2 to the MCU as feedback signals of the stepping motors M1 and M2.
6. The intake air conditioner control circuit as claimed in claim 2, wherein: the temperature and humidity pressure detection sub-circuit comprises a plurality of pressure sensors U6, a temperature and humidity sensor U7 and a multi-channel analog multiplexer U8; the pressure sensor U6 and the temperature and humidity sensor U7 are respectively arranged at an air inlet and an air outlet of the air conditioning box and in a water supply pipe of the surface cooler; the output ends of the pressure sensor U6 and the temperature and humidity sensor U7 are respectively electrically connected with the input end of the multichannel analog multiplexer U8, and the enabling end, the input selection end and the common output end of the multichannel analog multiplexer U8 are electrically connected with the GPIO port of the MCU; the multichannel analog multiplexer U8 is selectively communicated with each input end, so that the output signals of the corresponding pressure sensor U6 or temperature and humidity sensor U7 are input into the MCU through the common output end.
7. The intake air conditioning control circuit of claim 6, wherein: the pressure sensor U6 is PTX1400C, the temperature and humidity sensor U7 is HMD40Y, and the multichannel analog multiplexer U8 is AD 7501; signals output by the pressure sensor U6 or the temperature and humidity sensor U7 are input into an input end of the multichannel analog multiplexer U8 after being subjected to current-voltage conversion.
8. The intake air conditioner control circuit as claimed in claim 2, wherein: the fan driving sub-circuit comprises a fan driving chip U9 and a fan U10, the input end of the fan driving chip U9 is electrically connected with the GPIO port of the MCU, and the output end of the fan driving chip U9 is electrically connected with the input end of the fan U10; the pin 17 of the fan driving chip U9 is a working voltage input end, and the voltage input end is further electrically connected with the GPIO port of the MCU through a voltage feedback loop.
9. The intake air conditioning control circuit of claim 8, wherein: the voltage feedback loop comprises a series voltage division unit and a parallel voltage division unit, the series voltage division unit comprises resistors R5, R6, R7 and R8, the resistors are sequentially connected in series, the resistor R5 is also electrically connected with the input end of the parallel voltage division unit, and the resistor R8 is electrically connected with a pin 17 of a fan driving chip U9; the parallel voltage division unit comprises a resistor R9 and a resistor R10, one end of the resistor R9 is connected with one end of the resistor R5 and one end of the resistor R10 in parallel, the other end of the resistor R9 is connected with a GPIO port of the MCU, wherein the GPIO port is provided with an ADC port, and the other end of the resistor R10 is grounded.
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| CN202022013547.9U CN213542790U (en) | 2020-09-15 | 2020-09-15 | Air inlet air conditioner control circuit |
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| CN202022013547.9U CN213542790U (en) | 2020-09-15 | 2020-09-15 | Air inlet air conditioner control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113639457A (en) * | 2021-08-24 | 2021-11-12 | 江苏蚕丛科技有限公司 | Air inlet air conditioner used in engine test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113639457A (en) * | 2021-08-24 | 2021-11-12 | 江苏蚕丛科技有限公司 | Air inlet air conditioner used in engine test |
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