CN220381487U - Detection device of control circuit and air conditioner formed by detection device - Google Patents
Detection device of control circuit and air conditioner formed by detection device Download PDFInfo
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- CN220381487U CN220381487U CN202321761800.6U CN202321761800U CN220381487U CN 220381487 U CN220381487 U CN 220381487U CN 202321761800 U CN202321761800 U CN 202321761800U CN 220381487 U CN220381487 U CN 220381487U
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- 238000006243 chemical reaction Methods 0.000 claims description 37
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- 239000003990 capacitor Substances 0.000 claims description 11
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- 238000000034 method Methods 0.000 description 47
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- 238000012360 testing method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
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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 utility model provides a detection device of a control circuit and an air conditioner formed by the detection device, wherein the control circuit is used for controlling the on-off of M control pins in an electronic device, and M is an integer greater than 1; the detection device comprises M detection circuits, wherein the detection circuits comprise M detection resistors; one end of the detection resistor is connected with the control pin, and the other end of the detection resistor is connected with the power supply pin; a signal output end is arranged between the detection resistor and the power supply pin; when the control pin is in different states of power on and power off, the output signals of the signal output ends are different; and judging whether the control circuit is abnormal or not according to signals received by M signal output ends in the detection circuit. The detection device of the control circuit is simple in structure, stable and reliable in detection result and capable of improving detection efficiency of the control circuit.
Description
Technical Field
The utility model relates to the technical field of control circuit detection, in particular to a detection device of a control circuit and an air conditioner formed by the detection device.
Background
When the current air conditioner works, the control circuit is used for controlling each control pin in the electronic expansion valve, and when the level of the control pin is high level, the pin is conducted; when the level of the control pin is low, the pin is turned off. The control circuit controls the on-off of each control pin in the electronic expansion valve through the level, so as to control the refrigerant circulation route in the air conditioner.
The control circuit is used for actively controlling the control of the electronic expansion valve, and if the control circuit fails, the control circuit cannot effectively control the control pins in the electronic expansion valve, so that the refrigerating and heating effects of the air conditioner are affected.
In the prior art, for detection of a control circuit, the detection circuit is connected to an external detection device for detection before or after the air conditioner is in operation; the existing detection device has a complex structure, is arranged outside the air conditioner, and is used for verifying whether the control circuit is normal or not by arranging a corresponding detection device for each air conditioner; therefore, the air conditioner has the advantages that the air conditioner cost is increased, the detection process of the control circuit is complicated, and the operation efficiency of the air conditioner is affected.
Disclosure of Invention
In order to overcome the problems in the related art, one of the purposes of the utility model is to provide a detection device of a control circuit, which has a simple structure, stable and reliable detection result and improves the detection efficiency of the control circuit.
The detection device of a control circuit, the control circuit is used for controlling the on-off of M control pins in the electronic device, M is an integer greater than 1;
the detection device comprises M detection circuits, wherein the detection circuits comprise M detection resistors; one end of the detection resistor is connected with the control pin, and the other end of the detection resistor is connected with the power supply pin; a signal output end is arranged between the detection resistor and the power supply pin;
when the control pin is in different states of power on and power off, the output signals of the signal output ends are different; and judging whether the control circuit is abnormal or not according to signals received by M signal output ends in the detection circuit.
According to the signal received by the signal receiving end, whether the control logic and the connection relation of the control circuit are normal or not can be judged; the detection method is simple in structure, stable and reliable, and the detection efficiency of the control circuit is improved.
In the preferred technical scheme of the utility model, a photoelectric switch and a voltage conversion circuit are further arranged between the detection resistor and the power supply pin, the photoelectric switch comprises two input pins and two output pins, the two input pins are respectively connected with the detection resistor and the power supply pin, the output pin is connected with the voltage conversion circuit, and a signal output end is arranged in the voltage conversion circuit.
The photoelectric switch and the voltage conversion circuit are further arranged between the detection resistor and the power supply pin. The photoelectric switch is used for realizing isolation between a pin power supply and the voltage conversion circuit, and the voltage conversion circuit is used for converting a larger voltage value in the power supply pin into a smaller voltage value acceptable by the detection chip.
In a preferred technical scheme of the utility model, the voltage conversion circuit comprises an extraction power supply and a first extraction resistor, wherein the extraction power supply is connected with a first end of the first extraction resistor, a second end of the first extraction resistor is grounded through an output pin, and meanwhile, a second end of the first extraction resistor is connected with a signal output end.
The voltage value of the power supply is led out from the voltage conversion circuit, so that the voltage value of the signal output end is smaller, and the detection chip is ensured to be capable of normally monitoring the voltage value of the signal output end. By means of the photoelectric switch and the voltage conversion circuit, stable detection of the state of the control pin can be achieved, normal operation of the detection chip can be ensured, and operation stability of the monitoring device is improved.
In a preferred technical scheme of the utility model, the photoelectric switch is an optocoupler, the optocoupler comprises two output pins, and the two output pins are respectively connected with the second end of the first lead-out resistor and the ground.
In a preferred technical scheme of the utility model, the voltage conversion circuit further comprises a capacitor, and the two output pins of the optocoupler are respectively connected with two ends of the capacitor.
In a preferred technical scheme of the utility model, the voltage conversion circuit further comprises a second lead-out resistor, and the second end of the first lead-out resistor is connected with the signal output end through the second lead-out resistor.
The second in the voltage conversion circuit draws forth resistance and electric capacity in this application can ensure drawing forth smooth stable connection between power and signal output part and the ground connection, and on the basis that the opto-coupler realized keeping apart control circuit and voltage conversion circuit, draw forth voltage can feed back the different operating condition of opto-coupler to signal output part, realizes control circuit's effective detection.
In a preferred technical scheme of the utility model, the voltage of the power supply pin is larger than the voltage value of the outgoing power supply.
In a preferred technical scheme of the utility model, the photoelectric switch is a triode.
The second in the voltage conversion circuit draws forth resistance and electric capacity in this application can ensure to draw forth smooth stable connection between power and signal output part and the ground connection, and on the basis that triode realized keeping apart control circuit and voltage conversion circuit, draw forth voltage can feed back the signal output part with the different operating condition of triode, realizes control circuit's effective detection.
In the preferred technical scheme of the utility model, the electronic device is an electronic expansion valve, the electronic expansion valve comprises four control pins, and the control circuit is connected with the four control pins and a power supply pin; the power supply pin is positioned inside or outside the electronic expansion valve.
When judging the control circuit, only observing whether the 16 signal outputs appear in the resetting process after the electronic expansion valve control circuit is electrified for the first time, and judging that the logic relationship and the connection relationship of the control circuit are normal if the 16 signal outputs appear. If the output signal is not matched with the 16 signal outputs, the logic relationship and the connection relationship of the control circuit are judged to be abnormal.
Another object of the present utility model is to provide an air conditioner, including a detection device of a control circuit as described above.
The air conditioner can integrate the detection device inside the air conditioner, detection of the control circuit is realized by utilizing the process of resetting the control circuit, so that the stable reliability of the detection circuit before each operation of the air conditioner is ensured, and the stable reliability of the operation of the air conditioner is improved.
The innovation point of the application is that the detection of the control circuit is finished by utilizing the reset process, the reset process is necessary to exist in the control circuit, the detection circuit and the control pin corresponding to the control circuit are integrated together, and the judgment of the detection circuit can be realized by utilizing the reset process of the control circuit starting or other time periods. Because the control circuit needs to be reset after the first power-on, the control circuit can be detected before each operation, and the stable operation after the power-on is ensured.
The detection device is used for realizing detection of the control circuit in an automatic reset process after the control circuit of the electronic expansion valve is electrified for the first time, the detection process is automatically carried out, whether the detection process is a reset process after the control circuit is electrified for the first time or a reset process in other time periods, the control circuit can be automatically carried out, the detection process for the control circuit in the application is also automatically carried out, and particularly the control circuit is judged before the control circuit is operated each time, so that the stability of the judging circuit and the air conditioner operation can be improved.
The application can be at 2 M Arrangement signal selection 2 including M signal output terminal voltage values M-1 The number of the arrangement signals is used as a judgment point, so that the judgment accuracy and the judgment speed can be balanced.
The beneficial effects of the utility model are as follows:
the utility model provides a detection device of a control circuit, wherein the control circuit is used for controlling the disconnection of a plurality of control pins in an electronic device, the detection device is used for detecting whether the logic and connection relation of the control circuit are correct, and specifically, the detection device comprises M detection circuits, and the detection circuits comprise M detection resistors; one end of the detection resistor is connected with the control pin, and the other end of the detection resistor is connected with the power supply pin; a signal output end is arranged between the detection resistor and the power supply pin; in order to ensure that the detection process is carried out smoothly, a power supply pin is additionally arranged; the power supply pin and the control pin are respectively connected to two ends of the detection resistor to form a detection loop; when the control pin is in different states of power on and power off, the output signals of the signal output ends are different. The power on and power off of the control pin are determined by the level applied to the control pin, when the level applied to the control pin is different, the signal received by the signal output end is different, when the level applied to the control pin is higher, the voltage signal received by the signal output end is larger, and when the level applied to the control pin is lower, the voltage signal received by the signal output end is smaller. According to the signal received by the signal receiving end, whether the control logic and the connection relation of the control circuit are normal or not can be judged; the detection method is simple in structure, stable and reliable, and the detection efficiency of the control circuit is improved.
The utility model also provides an air conditioner comprising the detection device, the detection device can be integrated in the air conditioner, the detection of the control circuit is synchronously realized by utilizing the resetting process of the control circuit, the stable reliability of the detection circuit before each operation of the air conditioner is ensured, and the stable reliability of the operation of the air conditioner is improved.
Drawings
FIG. 1 is a schematic diagram of the structure of a detecting device in example 1;
FIG. 2 is a schematic diagram showing the structure of the detecting device in example 2;
FIG. 3 is a schematic diagram of the structure of the detecting device in example 3.
Detailed Description
Preferred embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the utility model. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Example 1
Referring to fig. 1, a detection apparatus of a control circuit is provided, where the control circuit is configured to control on/off of M control pins in an electronic device, and M is an integer greater than 1;
the detection device comprises M detection circuits, wherein the detection circuits comprise M detection resistors; one end of the detection resistor is connected with the control pin, and the other end of the detection resistor is connected with the power supply pin; and a signal output end is arranged between the detection resistor and the power supply pin.
In order to ensure that the detection process is carried out smoothly, a power supply pin is additionally arranged; the power supply pin and the control pin are respectively connected to two ends of the detection resistor to form a detection loop; when the control pins are in different states of power on and power off, the output signals of the signal output ends are different, wherein the voltage value of the power supply pins is fixed, the resistance value of the detection resistor is fixed, the power on and the power off of the control pins are determined by the level applied to the control pins, when the level applied to the control pins is different, the signals received by the signal output ends are also different, and when the level applied to the control pins is higher, the voltage signals received by the signal output ends are larger; when the level applied to the control pin is low, the voltage signal received by the signal output terminal is small.
The application can set that when the control pin is applied to the high level, the control pin is in an electrified state, and at the moment, the signal output end outputs a first voltage signal; when the voltage applied to the control pin is low, the control pin is in a power-off state, and at the moment, the signal output end outputs a second voltage signal. The voltage signal at the signal output terminal is equal to the voltage value of the power supply pin minus the voltage drop of the detection resistor, and minus the voltage value of the control pin, that is, the first voltage signal is necessarily smaller than the second voltage signal. Specifically, in the detection circuit, the high level and the low level applied to the control pin are determined, the voltage value of the power pin is determined, the resistance value of the detection resistor is determined, the specific structure of the detection circuit is determined, the determined first voltage signal and second voltage signal can be obtained, and the state of the control pin can be determined according to the voltage value received by the signal output end.
In the application, M detection circuits are in parallel independent relation, each detection circuit corresponds to one control pin, the state of the control pin can be obtained by analyzing the voltage signal of the signal output end in each detection circuit, and the control pins are controlled by the control circuit, so that whether the logic relation and the connection relation of the control circuit are correct or not can be judged. Conversely, if the logic relationship or the connection relationship of the control circuit is abnormal, the voltage signals received by the M signal output terminals in the detection circuit are necessarily abnormal. By means of the detection circuit and the power supply pin, the logic relation and the connection relation of the control circuit can be fed back to the output voltages of M signal output ends in the detection circuit, and the detection accuracy of the control circuit is ensured.
According to the signal received by the signal receiving end, whether the control logic and the connection relation of the control circuit are normal or not can be judged; the detection method is simple in structure, stable and reliable, and the detection efficiency of the control circuit is improved.
Example 2
Referring to fig. 2, a detection apparatus of a control circuit is disclosed, where the control circuit is configured to control on/off of M control pins in an electronic device, and M is an integer greater than 1;
the detection device comprises M detection circuits, wherein the detection circuits comprise M detection resistors; one end of the detection resistor is connected with the control pin, and the other end of the detection resistor is connected with the power supply pin; a signal output end is arranged between the detection resistor and the power supply pin; when the control pin is in different states of power on and power off, the output signals of the signal output ends are different; and judging whether the control circuit is abnormal or not according to signals received by M signal output ends in the detection circuit.
Further, the number of signal output part and the number of detection circuit and the number of control pin one-to-one in this application, in order to be convenient for carry out effective monitoring to signal output part, this application can be with signal output part be connected to in the detection chip, adopts the monitoring chip to monitor the voltage of signal output part. Because the voltage value of the power supply pin is larger, the voltage value of the signal output end is larger, if the signal output end is directly connected to the detection chip, the phenomena of high-voltage breakdown and the like of the detection chip can be possibly caused, and therefore, the photoelectric switch and the voltage conversion circuit are further arranged between the detection resistor and the power supply pin. The photoelectric switch is used for realizing isolation between a pin power supply and the voltage conversion circuit, and the voltage conversion circuit is used for converting a larger voltage value in the power supply pin into a smaller voltage value acceptable by the detection chip.
Specifically, the photoelectric switch comprises two input pins and two output pins, wherein the two input pins are respectively connected with the detection resistor and the power supply pin, the output pin is connected with the voltage conversion circuit, and a signal output end is arranged in the voltage conversion circuit. When the control pin applies high level, the voltage values of the high level and the power supply pin can be set to be equal, and at the moment, the voltage values on the two input pins are equal, the photoelectric switch is not conducted, namely, the output value of the signal output end in the voltage conversion circuit is 0. When the control pin applies low level, a voltage difference exists between the two input pins, and the photoelectric switch is conducted, namely the output value of the signal output end in the voltage conversion circuit is larger than 0.
Specifically, the voltage conversion circuit comprises an extraction power supply and a first extraction resistor, wherein the extraction power supply is connected with a first end of the first extraction resistor, a second end of the first extraction resistor is grounded through an output pin, and meanwhile, a second end of the first extraction resistor is connected with a signal output end. When the photoelectric switch is not conducted, the outgoing power supply cannot be grounded through the second resistor, and the voltage value of the outgoing power supply is output from the signal output end after the voltage drop of the first outgoing resistor, namely the output voltage of the signal output end is larger than 0. When the photoelectric switch is turned on, the outgoing power supply can be grounded through the second resistor, and at the moment, the voltage value of the outgoing power supply is directly grounded, and the voltage value of the signal output end is equal to 0.
In this embodiment, the photoelectric switch is used to isolate the power pin from the signal output end, because the control circuit and the detection circuit are not grounded together, and the voltage value of the power pin may be higher than the withstand voltage value of the detection chip connected to the signal output end, so that different states of the control pin are fed back to the voltage conversion circuit through the photoelectric switch, and meanwhile, when the photoelectric switch is in a conducting state or a non-conducting state, the voltage value of the signal output end is different. The voltage value of the power supply is led out from the voltage conversion circuit, so that the voltage value of the signal output end is smaller, and the detection chip is ensured to be capable of normally monitoring the voltage value of the signal output end. By means of the photoelectric switch and the voltage conversion circuit, stable detection of the state of the control pin can be achieved, normal operation of the detection chip can be ensured, and operation stability of the monitoring device is improved.
Example 3
Referring to fig. 3, a detection apparatus of a control circuit is disclosed, where the control circuit is configured to control on/off of M control pins in an electronic device, and M is an integer greater than 1;
the detection device comprises M detection circuits, wherein the detection circuits comprise M detection resistors; one end of the detection resistor is connected with the control pin, and the other end of the detection resistor is connected with the power supply pin; an optocoupler and a voltage conversion circuit are further arranged between the detection resistor and the power supply pin, the optocoupler comprises two input pins and two output pins, the two input pins are respectively connected with the detection resistor and the power supply pin, and the two output pins are respectively connected with the second end of the first lead-out resistor and grounded.
The voltage conversion circuit comprises an extraction power supply, a first extraction resistor, a second extraction resistor and a capacitor, wherein the extraction power supply is connected with the first end of the first extraction resistor, and the second end of the first extraction resistor is simultaneously connected with one end of the capacitor, one end of the second extraction resistor and one output pin; the other output pin is grounded, and the other end of the capacitor is grounded. The other end of the second extraction resistor is connected with the signal output end.
Further, the voltage value of the power supply pin is equal to the high level applied by the control pin, and the voltage value of the lead-out power supply is smaller than the voltage value of the power supply pin. Specifically, as shown in fig. 3, the voltage value of the outgoing power supply is 3.3V, and the voltage value of the power supply pin is 10V.
Taking one of the control pins as an example for explanation, the situation of each control pin is the same; when the voltage applied to the control pin is high level, the voltages of the two input ends in the optocoupler are equal, no voltage difference exists, the optocoupler does not work at this time, the two output ends of the optocoupler are not conducted, the outgoing power supply cannot be grounded through the two output ends of the optocoupler, and at this time, the output voltage of the signal output end is equal to the voltage value of the outgoing power supply.
When the voltage applied to the control pin is low level, the two input ends of the optocoupler have a voltage difference, the optocoupler works at the moment, the two output ends of the optocoupler are conducted, the extracted power supply is grounded through the two output ends of the optocoupler, and at the moment, the output voltage of the signal output end is equal to 0.
In the embodiment, M signal output ends of a detection circuit are connected to a detection chip, each signal output end is monitored in the detection chip, and when the voltage value of the signal output end is monitored to be 0, the control signal corresponding to the signal output end is indicated to apply a low level; when the voltage value of the signal output end is not 0, the control signal corresponding to the signal output end is indicated to apply high level. And judging whether the control circuit is in normal operation or not by detecting the voltage value of each signal output end in the chip.
In this embodiment, the optical coupling PC817 may be specifically selected to realize isolation between the control circuit and the voltage conversion circuit.
In the embodiment, the second lead-out resistor and the second lead-out capacitor in the voltage conversion circuit can ensure smooth and stable connection between the lead-out power supply and the signal output end and the grounding end, and on the basis that the optocoupler is isolated from the control circuit and the voltage conversion circuit, the lead-out voltage can feed different working states of the optocoupler back to the signal output end, so that effective detection of the control circuit is realized.
When the control circuit controls M control pins in the electronic device, reset processing is carried out after primary operation, wherein the reset refers to that the control circuit controls the M control pins to be powered on and powered off in sequence, in the reset process, the M signal output ends correspondingly experience states that the output voltage is not zero and is zero in sequence, and whether the reset process of the control circuit is normally carried out can be judged by monitoring the output voltage values of the M signal output ends.
Further, in the resetting process of the control circuit, M signal output ends output 2 M The detection circuit outputs an arrangement signal containing M signal output end voltage values when the first control pin is at high level and the control pin is at low level; when the M control pins are all high level, the detection circuit outputs an arrangement signal containing the voltage values of the M signal output ends; by analogy, each signal output end has two possibilities, and the reset process can generate 2 M An arrangement signal containing M signal output terminal voltage values. The application can observe whether the 2 appears in the detection chip connected with the signal output end M The arrangement signals comprise M signal output end voltage values to judge whether the resetting process of the control circuit is smooth or not, and further judge whether the logic relationship and the connection relationship of the control circuit are normal or not.
In fact, if it is simultaneous to 2 M The arrangement signal containing the voltage values of the M signal output ends is judged, so that the judgment is more accurate and stable, and in the process, the voltage value of the M signal output ends is 2 M The judgment of an arrangement signal containing M signal output terminal voltage values increases the judgment time. In order to increase the judging speed, the method can also be 2 M At least two signals are selected from the arrangement signals containing the voltage values of the M signal output ends to judge the control circuit. That is, the control circuit can be considered to be operating normally as long as the detection circuit outputs at least two selected arrangement signals containing the voltage values of the M signal output terminals. By pair 2 M The selection of the part of the arrangement signal containing the voltage values of the M signal output ends can improve the judging efficiency of the control circuit.
The innovation point of the application is that the detection of the control circuit is finished by utilizing the reset process, the reset process is necessary to exist in the control circuit, the detection circuit and the control pin corresponding to the control circuit are integrated together, and the judgment of the detection circuit can be realized by utilizing the reset process of the control circuit starting or other time periods. Because the control circuit needs to be reset after the first power-on, the control circuit can be detected before each operation, and the stable operation after the power-on is ensured.
Example 4
As shown in fig. 1-3, a detecting device of a control circuit is different from embodiment 3 in that the photoelectric switch is a triode in this embodiment, the triode includes two input pins and one output pin, the connection relationship of the two input pins is similar to that of the two input pins of the optocoupler in embodiment 3, and one output pin is simultaneously grounded and connected with the first lead-out resistor.
The principle of action is the same as that of example 3: taking one of the control pins as an example for explanation, the situation of each control pin is the same; when the voltage applied to the control pin is high level, the voltage of two input ends in the triode is equal, no voltage difference exists, the triode does not work at the moment, the two output ends of the triode are not conducted, the extraction power supply cannot be grounded through the triode, and at the moment, the output voltage of the signal output end is equal to the voltage value of the extraction power supply.
When the voltage applied to the control pin is low level, two input ends of the triode have pressure difference, the triode works at the moment, two output ends of the triode are conducted, the leading-out power supply is grounded through the triode, and at the moment, the output voltage of the signal output end is equal to 0.
It should be noted that, when the types of the triodes are different, the conduction relations among the three pins are different, but no matter what the types of the triodes are, when the control pins apply the high level and the low level, the voltage difference between the two input pins is different, and according to the voltage difference between the two input pins, the different state changes of the output pins can be realized, so that the different outputs of the signal output ends in the voltage conversion circuit are realized.
The remaining detection principle is the same as that of example 3 and will not be described in detail here.
Example 5
As shown in fig. 1-3, a detection device of a control circuit is provided, wherein the control circuit is used for controlling the disconnection of four control pins in an electronic expansion valve;
the detection device comprises four detection circuits, wherein the detection circuits comprise four detection resistors; one end of the detection resistor is connected with the control pin, and the other end of the detection resistor is connected with the power supply pin; an optocoupler and a voltage conversion circuit are further arranged between the detection resistor and the power supply pin, the optocoupler comprises two input pins and two output pins, the two input pins are respectively connected with the detection resistor and the power supply pin, and the two output pins are respectively connected with the second end of the first lead-out resistor and grounded.
The voltage conversion circuit comprises an extraction power supply, a first extraction resistor, a second extraction resistor and a capacitor, wherein the extraction power supply is connected with the first end of the first extraction resistor, and the second end of the first extraction resistor is simultaneously connected with one end of the capacitor, one end of the second extraction resistor and one output pin; the other output pin is grounded, and the other end of the capacitor is grounded. The other end of the second extraction resistor is connected with the signal output end.
The electronic expansion valve is used in an air conditioner control system, and because the control circuit and the detection circuit are not commonly grounded in the air conditioner, and the voltage value of the power supply pin is 12V and is larger than the tolerance voltage of the detection chip, the input voltage of the control circuit needs to be isolated and converted. Specifically, in this embodiment, an optocoupler PC817 is selected to realize voltage isolation of the detection circuit, and a voltage conversion circuit is selected to realize conversion from high voltage to low voltage.
Taking a control pin in an electronic expansion valve as an example; when the voltage applied to the control pin is high level, the voltages of the two input ends in the optocoupler are equal, no voltage difference exists, the optocoupler does not work at this time, the two output ends of the optocoupler are not conducted, the outgoing power supply cannot be grounded through the two output ends of the optocoupler, and at this time, the output voltage of the signal output end is equal to the voltage value of the outgoing power supply and is high level of 3.3V.
When the voltage applied to the control pin is low level, the two input ends of the optical coupler have a voltage difference, the optical coupler works at the moment, the two output ends of the optical coupler are conducted, the leading-out power supply is grounded through the two output ends of the optical coupler, and at the moment, the output voltage of the signal output end is 0V low level.
The four control pins in the electronic expansion valve are all as described above. In this embodiment, the electronic expansion valve is installed on the control system of the air conditioner, after the air conditioner is electrified for the first time, the control circuit of the electronic expansion valve can automatically reset, in the resetting process, four control pins can sequentially undergo the application of high level and low level, and in the application, the detection circuit is integrated inside the air conditioner, namely, the detection process of the detection circuit to the control circuit can be synchronously carried out in the resetting process, and the judgment of the detection control circuit can be realized only by observing the output signal of the detection circuit.
It should be noted that, in the present application, four signal output terminals are integrated together, and each time, four signal output terminals output an arrangement signal including voltage values of 4 signal output terminals, in a reset process of the control circuit, a total of 16 arrangement signals including voltage values of 4 signal output terminals are output. In 16 permutation signals, when we set that the signal output end outputs high level, the value of the signal output end is marked as 1, when the signal output end outputs low level, the value of the signal output end is marked as 0, then the permutation signals in 16 are as follows: 0000, 0001, 0011, 0100, 0101, 0110, 0111, 1001, 1010, 1011, 1100, 1101, 1110, 1111. Where 1111 denotes that four control pins are all applied high, 0000 denotes that four control pins are all applied low, 0001 denotes that the first three control pins are applied low, the last control pin is applied high, and so on.
When judging the control circuit, only observing whether the 16 signal outputs appear in the resetting process after the electronic expansion valve control circuit is electrified for the first time, and judging that the logic relationship and the connection relationship of the control circuit are normal if the 16 signal outputs appear. If the output signal is not matched with the 16 signal outputs, the logic relationship and the connection relationship of the control circuit are judged to be abnormal.
Further, in this embodiment, four signal output terminals are connected to the detection chip, and a detection program for the detection chip is provided, and the detection program automatically recognizes the signal received by the detection chip, where the signal received by the detection chip has been converted into a digital signal containing 0 and 1.
In order to improve the detection efficiency, 8 judgment points are selected from the arrangement signals in 16, for example, the 8 judgment points may be 0011, 0110, 0111, 1001, 1011, 1100, 1101, 1111, for example. The 8 decision points may be any other combination.
In this embodiment, 8 decision points are selected to make the decision of the control circuit fast and conveniently, and one byte has eight bits, and each bit represents a level decision result, so that the detection program can process conveniently. If the number of bits is too small, the test time can be shortened, but the judgment result is inaccurate, so that 8 judgment points are preferably selected, and the judgment rate can be improved on the basis of ensuring the judgment accuracy.
Specifically, in the process of processing the detection chip by adopting the detection program, a judgment point detected by the detection program can be set to be marked as 1, and finally, all 8 judgment points are marked as 1, so that the control circuit of the electronic expansion valve is considered to be abnormal, and if any judgment point is not marked as 1, the control circuit of the electronic expansion valve is considered to be abnormal.
Example 6
As shown in fig. 1 to 3, the detection device of the present application works as follows: in the resetting process of the control circuit, judging whether the control circuit is abnormal or not according to signals received by M signal output ends in the detection circuit.
The reset process may be performed automatically after the control circuit is first powered on, that is, the detection process in this embodiment is also performed automatically after the control circuit is first powered on.
In the resetting process of the control circuit, the output end of the detection circuit can output 2 M An arrangement signal containing M signal output terminal voltage values, at 2 M Selecting at least two signals from the arrangement signals containing M signal output end voltage values to judge whether the control circuit is abnormal; when the output end of the detection circuit outputs the two selected signals, judging that the control circuit is normal; when the output end of the detection circuit does not output the two selected signals, the control circuit is judged to be abnormal.
In order to balance the judgment accuracy and the judgment speed, the method can be used for judging the judgment speed at 2 M Arrangement signal selection 2 including M signal output terminal voltage values M-1 The arrangement signals are used as judgment points, namely, only 2 needs to be monitored at the signal output end of the detection circuit M-1 And determining that the control circuit is normal by judging points, or determining that the control circuit is abnormal if only one judging point is not detected.
When the electronic device is an electronic expansion valve, the four control pins in the electronic expansion valve can output 16 arrangement signals containing 4 voltage values of the signal output ends. In 16 permutation signals, when we set that the signal output end outputs high level, the value of the signal output end is marked as 1, when the signal output end outputs low level, the value of the signal output end is marked as 0, then the permutation signals in 16 are as follows: 0000, 0001, 0011, 0100, 0101, 0110, 0111, 1001, 1010, 1011, 1100, 1101, 1110, 1111. Where 1111 denotes that four control pins are all applied high, 0000 denotes that four control pins are all applied low, 0001 denotes that the first three control pins are applied low, the last control pin is applied high, and so on.
In order to improve the detection efficiency, 8 judgment points are selected from the arrangement signals in 16, for example, the 8 judgment points may be 0011, 0110, 0111, 1001, 1011, 1100, 1101, 1111, for example. The 8 decision points may be any other combination.
In this embodiment, 8 decision points are selected to make the decision of the control circuit fast and conveniently, and one byte has eight bits, and each bit represents a level decision result, so that the detection program can process conveniently. If the number of bits is too small, the test time can be shortened, but the judgment result is inaccurate, so that 8 judgment points are preferably selected, and the judgment rate can be improved on the basis of ensuring the judgment accuracy.
Specifically, in the process of processing the detection chip by adopting the detection program, a judgment point detected by the detection program can be set to be marked as 1, and finally, all 8 judgment points are marked as 1, so that the control circuit of the electronic expansion valve is considered to be abnormal, and if any judgment point is not marked as 1, the control circuit of the electronic expansion valve is considered to be abnormal.
Example 7
The application also provides an air conditioner comprising the detection device described in embodiments 1-5. The detection circuit in the detection device is connected with four control pins and power supply pins in the electronic expansion valve, and meanwhile, the detection circuit is integrated in the air conditioning system.
The detection device is used for realizing detection of the control circuit in an automatic reset process after the control circuit of the electronic expansion valve is electrified for the first time, the detection process is automatically carried out, whether the detection process is a reset process after the control circuit is electrified for the first time or a reset process in other time periods, the control circuit can be automatically carried out, the detection process for the control circuit in the application is also automatically carried out, and particularly the control circuit is judged before the control circuit is operated each time, so that the stability of the judging circuit and the air conditioner operation can be improved.
Specific detection devices in this embodiment can be found in embodiments 1-5, and will not be described in detail herein.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present application, it should be understood that, where azimuth terms such as "front, rear, upper, lower, left, right", "transverse, vertical, horizontal", and "top, bottom", etc., indicate azimuth or positional relationships generally based on those shown in the drawings, only for convenience of description and simplification of the description, these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are merely for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and thus should not be construed as limiting the scope of the present application.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. The detection device of the control circuit is characterized in that the control circuit is used for controlling the on-off of M control pins in an electronic device, and M is an integer greater than 1;
the detection device comprises M detection circuits, wherein the detection circuits comprise M detection resistors; one end of the detection resistor is connected with the control pin, and the other end of the detection resistor is connected with the power supply pin; a signal output end is arranged between the detection resistor and the power supply pin;
when the control pin is in different states of power on and power off, the output signals of the signal output ends are different; and judging whether the control circuit is abnormal or not according to signals received by M signal output ends in the detection circuit.
2. The detecting device for the control circuit according to claim 1, wherein a photoelectric switch and a voltage converting circuit are further arranged between the detecting resistor and the power supply pin, the photoelectric switch comprises two input pins and two output pins, the two input pins are respectively connected with the detecting resistor and the power supply pin, the output pin is connected with the voltage converting circuit, and a signal output end is arranged in the voltage converting circuit.
3. The device for detecting a control circuit according to claim 2, wherein the voltage converting circuit comprises an extraction power supply and a first extraction resistor, the extraction power supply is connected to a first end of the first extraction resistor, a second end of the first extraction resistor is grounded through an output pin, and a second end of the first extraction resistor is connected to a signal output end.
4. A detection device for a control circuit according to claim 3, wherein the optoelectronic switch is an optocoupler, the optocoupler includes two output pins, and the two output pins are respectively connected to the second end of the first lead-out resistor and to the ground.
5. The detecting device for detecting a voltage according to claim 4, wherein the voltage converting circuit further comprises a capacitor, and two output pins of the optocoupler are connected to two ends of the capacitor respectively.
6. A detection device for a control circuit according to claim 3, wherein the voltage conversion circuit further comprises a second lead-out resistor, and the second end of the first lead-out resistor is connected to the signal output end through the second lead-out resistor.
7. A detection device for a control circuit according to claim 3, wherein the voltage of the power supply pin is greater than the voltage value of the outgoing power supply.
8. The device for detecting a control circuit according to claim 2, wherein the photoelectric switch is a triode.
9. The device for detecting a control circuit according to claim 1, wherein the electronic device is an electronic expansion valve, the electronic expansion valve includes four control pins, and the control circuit is connected to the four control pins and a power supply pin; the power supply pin is positioned inside or outside the electronic expansion valve.
10. An air conditioner comprising a detection device of a control circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321761800.6U CN220381487U (en) | 2023-07-06 | 2023-07-06 | Detection device of control circuit and air conditioner formed by detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321761800.6U CN220381487U (en) | 2023-07-06 | 2023-07-06 | Detection device of control circuit and air conditioner formed by detection device |
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| CN220381487U true CN220381487U (en) | 2024-01-23 |
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| CN202321761800.6U Active CN220381487U (en) | 2023-07-06 | 2023-07-06 | Detection device of control circuit and air conditioner formed by detection device |
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| Country | Link |
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| CN (1) | CN220381487U (en) |
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2023
- 2023-07-06 CN CN202321761800.6U patent/CN220381487U/en active Active
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