Fan-coil gear detection circuit and gear detection system

Abstract

The application relates to a fan coil gear detection circuit and a gear detection system. The fan coil gear detection circuit comprises a fan input port and a voltage detection circuit which are connected in sequence; the voltage detection circuit is used for connecting a gear judgment circuit; the fan input port comprises a plurality of fan gear voltage input circuits; the input end of the fan gear voltage input circuit is used for connecting any gear line of a fan coil to be detected, and the output end is connected with the voltage detection circuit; the fan gear voltage input circuit acquires current operation state data of the fan coil to be detected and outputs the current operation state data; the voltage detection circuit receives and processes the current operation state data and outputs current detection voltage of the fan coil to be detected; the current detection voltage is used for indicating the gear judgment circuit to confirm the current operation gear of the fan coil to be detected. The application can detect the gear size of the fan by using only one detection line, and can simultaneously detect the gear states of multiple fan coils.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of central air conditioning, in particular to a fan coil gear detection circuit and a gear detection system. BACKGROUND

[0002] With the development of central air conditioning billing system, the traditional fan coil gear detection generally adopts two methods: one is to simultaneously connect the high gear, medium gear and low gear three gear lines of the fan coil, and to detect the voltages of the three gear lines to determine the gear; the other is to only connect a medium gear line, and to adjust the resistance value on the project site one by one through a sliding resistor, so that the voltages of the high, medium and low gears are all in a detectable range.

[0003] In the implementation process, the inventors found that the current fan coil gear detection has at least the following problems: the wiring operation is tedious, the construction cost is high, and the adaptability is poor. SUMMARY

[0004] Therefore, it is necessary to provide a fan coil gear detection circuit and a gear detection system capable of simplifying the fan coil gear detection operation.

[0005] To achieve the above purpose, on the one hand, the embodiments of the present application provide a fan coil gear detection circuit, which comprises a fan input port and a voltage detection circuit connected in sequence; the voltage detection circuit is used to connect a gear judgment circuit;

[0006] The fan input port comprises a plurality of fan gear voltage input circuits; the input end of the fan gear voltage input circuit is used to connect any gear line of the fan coil to be detected, and the output end is connected to the voltage detection circuit; the fan gear voltage input circuit acquires the current running state data of the fan coil to be detected and outputs the data.

[0007] The voltage detection circuit receives and processes the current running state data, and outputs the current detection voltage of the fan coil to be detected; the current detection voltage is used to indicate the gear judgment circuit to confirm the current running gear of the fan coil to be detected.

[0008] In one of the embodiments, the voltage detection circuit comprises a voltage detection chip and a serial communication interface.

[0009] The input pin of the voltage detection chip is connected to the output end of the fan gear voltage input circuit; the voltage detection chip is connected to the gear judgment circuit through the serial communication interface.

[0010] In one of the embodiments, the serial communication interface is an SPI communication interface; the SPI communication interface is integrated in the internal part of the voltage detection chip.

[0011] In one of the embodiments, the voltage detection chip is an electric energy metering chip.

[0012] The output ends of the fan gear voltage input circuit are connected with the voltage channel positive analog input pin and the voltage channel negative analog input pin of the electric energy metering chip respectively.

[0013] In one of the embodiments, the electric energy metering chip is a three-phase electric energy metering chip.

[0014] In one of the embodiments, the fan input port includes 6 fan gear voltage input circuits; the fan gear voltage input circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor and a second capacitor;

[0015] One end of the first resistor is used for connecting any gear line of the fan coil to be detected, and the other end is connected with one end of the second resistor; the other end of the second resistor is used for connecting the voltage channel positive analog input pin of the electric energy metering chip, and is connected with one end of the third resistor and one end of the first capacitor respectively; the other end of the third resistor and the other end of the first capacitor are both grounded;

[0016] One end of the fourth resistor and one end of the second capacitor are both used for connecting the voltage channel negative analog input pin of the electric energy metering chip, and the other ends are both grounded.

[0017] In one of the embodiments, it further includes an output interface circuit; the output interface circuit includes a clock oscillator and an isolation component;

[0018] One end of the isolation component is connected with the voltage detection circuit, and the other end is used for connecting the gear judgment circuit.

[0019] In one of the embodiments, the voltage detection circuit includes a voltage detection chip whose input pin is connected with the output end of the fan gear voltage input circuit; the isolation component includes a first double-channel digital isolator and a second double-channel digital isolator;

[0020] The output end of the first double-channel digital isolator is connected with the chip select end of the voltage detection chip and the serial clock pin of the voltage detection chip respectively; the input end of the first double-channel digital isolator is used for connecting the gear judgment circuit;

[0021] One input end of the second double-channel digital isolator is connected with the serial data output pin of the voltage detection chip, and one output end is used for connecting the gear judgment circuit; the other input end of the second double-channel digital isolator is used for connecting the gear judgment circuit, and the other output end is connected with the serial data input pin of the voltage detection chip.

[0022] A fan gear detection system, including a gear judgment circuit, and a fan coil gear detection circuit as described above connected with the gear judgment circuit;

[0023] The fan coil gear detection circuit is used for connecting each fan coil respectively.

[0024] In one embodiment, the gear determination circuit comprises an MCU.

[0025] The fan coil gear detection circuit outputs the current detection voltage of each fan coil.

[0026] The MCU confirms the current running gear of each fan coil according to the current detection voltage.

[0027] One of the above technical solutions has the following advantages and beneficial effects:

[0028] The application accesses each fan coil through a fan input port, which comprises a plurality of fan gear voltage input circuits. One gear line (i.e. any one of high, medium and low gear lines) of the fan coil is accessed to the fan gear voltage input circuit. The voltage detection circuit detects the voltage of the current running state of the fan, and then outputs the voltage to the gear determination circuit to provide gear determination data for the gear determination circuit. The application only needs to use one detection line to detect the gear size of the fan, and can simultaneously detect the gear state of multiple fan coils. The construction is simple, the detection circuit is simple and the cost is low, which greatly simplifies the fan coil gear detection operation. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0030] Figure 1 The application environment diagram of the fan coil gear detection circuit in one embodiment;

[0031] Figure 2 The structural schematic diagram of the fan coil gear detection circuit in one embodiment;

[0032] Figure 3 The structural schematic diagram of the voltage detection circuit in the fan coil gear detection circuit in one embodiment;

[0033] Figure 4 The specific structural schematic diagram of the voltage detection circuit in one embodiment;

[0034] Figure 5 The structural schematic diagram of the fan gear voltage input circuit in the fan coil gear detection circuit in one embodiment;

[0035] Figure 6Fig. 2 is a schematic diagram of the structure of the input port of the fan in one embodiment;

[0036] Figures 7a-7b Fig. 4 is a schematic diagram of the structure of the fan gear voltage input circuit in one embodiment;

[0037] Figure 8 Fig. 5 is a schematic diagram of the structure of the fan coil gear detection circuit in another embodiment;

[0038] Figure 9 Fig. 6 is a schematic diagram of the structure of the output interface circuit in one embodiment;

[0039] Figure 10 Fig. 7 is a specific structure block diagram of the output interface circuit in one embodiment. DETAILED DESCRIPTION

[0040] In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the relevant drawings. The drawings show embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0042] It can be understood that the terms "first", "second", etc. used in the present application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element.

[0043] Spatially relative terms, such as "under", "below", "lower", "on", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and / or operation in addition to the orientations depicted in the figures. For example, if a device is turned over, elements described as "below" or "under" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can also be oriented in the other way, and the spatially relative terms used herein are intended to encompass both orientations. It is noted that the terms "first", "second", etc. can be used to describe various elements, but these elements should not be limited by these terms. These terms are only used to distinguish the first element from another element.

[0044] It is to be noted that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or connected through an intervening element. Also, "connected" in the following embodiments, if there is a transmission of an electric signal or data between the connected objects, should be understood as "electrically connected", "communicatively connected", etc.

[0045] As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It is to be understood that the terms "comprises", "comprising", "includes", "including" or "has", "having" etc., specify the presence of stated features, integers, steps, operations, elements, parts or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts or combinations thereof.

[0046] The conventional fan coil gear position detection applied to central air conditioning billing generally adopts the following two methods: one is to simultaneously connect the high gear, medium gear and low gear three gear lines of the fan coil, and to judge the gear position by detecting the voltage of the three gear lines respectively, the disadvantage is that the wiring is more, especially the construction is complex and the cost is high when simultaneously detecting multiple fan coils; the second is to only connect a medium gear line, and to adjust the resistance value on site by a sliding resistor one by one, so that the voltages of the high, medium and low gears are all in a detectable range, which is generally only 3.3V-5V, the disadvantage is that the detection range is narrow, and it is very time-consuming to debug the potentiometer in the long-term high-voltage environment. In addition, when the fan runs for a long time or the power supply grid fluctuates, the fan gear position cannot be accurately judged because the detected voltage value exceeds the detection range.

[0047] Obviously, the conventional method of detecting by 3 gear lines has the problems of complicated wiring operation, high construction cost, 3-way detection circuit, high maintenance cost and difficulty when multiple fan coils are detected simultaneously. The conventional method of detecting by adjusting the voltage value with a sliding resistor has the problems of narrow detection range, detection error caused by long-term fan operation or large grid voltage fluctuation, poor adaptability and accuracy, high reliability requirement of the sliding resistor contact, complicated debugging operation and large size and high cost.

[0048] The application can detect the 3 gear positions of the fan coil by a single gear line, can simultaneously detect multiple fan states, can solve the problem of detection error caused by long-term fan operation or large grid voltage fluctuation, and can detect whether the fan coil is online to realize anti-theft.

[0049] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0050] The fan coil gear detection circuit provided by the present application can be applied in the application environment as shown in Figure 1 The fan coil gear detection circuit 100 can be connected with the fan coil 104 to be detected through a gear line to obtain the current detection voltage of the gear line. The gear determination circuit 102 for determining the fan gear can be connected with the fan coil gear detection circuit 100 to obtain the current detection voltage as the gear determination data.

[0051] Further, the gear determination circuit 102 can include but is not limited to a microcontroller unit (MCU) or a single-chip microcomputer. The fan coil gear detection circuit 100 can be a separate device or integrated with the gear determination circuit 102 as a corresponding gear detection assembly to be applied in the gear detection of the fan coil 104.

[0052] The fan coil 104 (i.e. fan coil unit) can include a small fan, a motor and a coil (air heat exchanger) and belongs to one of the terminal devices of the air conditioning system. When the coil passes through chilled water or hot water, the coil exchanges heat with the air outside the pipe to cool, dehumidify or heat the air to adjust the air parameters in the room, which is a commonly used cooling and heating terminal device. In the present application, the fan coil gear detection circuit 100 can detect the voltage (i.e. current detection voltage) of the current running state of the fan through one gear line (i.e. any one of high, medium or low gear line) connected to the fan coil 104, as the gear determination data of the gear determination circuit 102. The number of fan coils 104 can be multiple and simultaneously connected to the fan coil gear detection circuit 100.

[0053] In one embodiment, as shown in Figure 2 A fan coil gear detection circuit is provided, which is applied in Figure 1 For example, the fan coil gear detection circuit includes a fan input port 210, a voltage detection circuit 220 connected in sequence; the voltage detection circuit 220 is used to connect with a gear determination circuit;

[0054] The fan input port 210 includes a plurality of fan gear voltage input circuits 212; the input end of the fan gear voltage input circuit 212 is used to connect with any gear line of the fan coil to be detected, and the output end is connected with the voltage detection circuit 220; the fan gear voltage input circuit 212 obtains the current running state data of the fan coil to be detected and outputs;

[0055] The voltage detection circuit 220 receives and processes the current running state data, and outputs the current detection voltage of the fan coil to be detected; the current detection voltage is used to indicate the gear determination circuit to confirm the gear of the fan coil to be detected currently running.

[0056] Specifically, for each fan coil to be detected accessing the fan input port 210, any gear line of the fan coil to be detected can access the corresponding fan gear voltage input circuit 212; wherein any gear line of the fan coil to be detected can refer to 1 gear line (i.e. any 1 of high, medium or low gear line) of the fan coil 104.

[0057] The application detects one line of the fan coil gear, obtains the voltage of the current running state of the fan (i.e. the current detection voltage), that is, the application can read the voltage size of the current fan coil running. Wherein the fan gear voltage input circuit 212 can obtain the current running state data of the fan coil to be detected, and output to the voltage detection circuit 220, and then process the current running state data by the voltage detection circuit 220, and output the current detection voltage of the fan coil to be detected.

[0058] Further, the current running state data in the application can include the fan gear voltage, and the voltage detection circuit 220 can be implemented by using the corresponding voltage detection chip 222, for example, the fan gear voltage input by the fan gear voltage input circuit 212 is obtained through the input pin of the voltage detection chip 222, and then the voltage detection chip 222 detects the voltage of the current running state of the fan. In one specific example, the voltage detection chip 222 can be an electric energy metering chip.

[0059] The application only needs to use one detection line to detect the gear size of the fan, which can reduce the construction wiring cost, that is, the three gear states of the fan coil can be detected by using a single gear line, which is simple to construct and simplifies the detection circuit. The application can detect the gear state of multiple fan coils at the same time, which greatly simplifies the fan coil gear detection operation.

[0060] Further, the voltage detection circuit 220 outputs the current detection voltage of the fan coil to be detected to the gear determination circuit, thereby providing the gear determination data for the gear determination circuit. It should be noted that the gear determination circuit in the application can confirm the gear of the fan coil to be detected currently running based on the current detection voltage; in one example, the gear determination circuit can use MCU or single-chip microcomputer to realize the corresponding function. The application does not have specific limitation on the gear determination circuit, and the way of confirming the gear of the fan coil to be detected according to the current detection voltage is also available.

[0061] For example, the gear judgment circuit can adopt a gear self-learning mode to confirm the current running gear of the fan coil to be detected; wherein, the gear self-learning can refer to the process of sample set training, for example, by reading the voltage size of the current fan coil running, the high gear, medium gear, low gear, shutdown, detection line disconnection abnormality and power line reverse connection abnormality of the running are judged, and the running state values are learned and saved. For another example, the gear judgment circuit of the present application can prestore the corresponding gear voltage value, and compare the current detection voltage with the gear voltage value, and confirm the current running gear of the fan coil to be detected according to the comparison result, and distinguish the high, medium and low gears of the current running.

[0062] In addition, when the current detection voltage is 0, it can be judged that the fan coil 104 is currently in the shutdown state, when the current detection voltage is 1-40, this state can be power line reverse connection abnormality; for another example, if the current detection voltage is 45-60, this state can be detection line disconnection abnormality. In one specific embodiment, the present application can detect whether the fan coil is online to realize anti-theft.

[0063] In one specific embodiment, as shown in Figure 3 The voltage detection circuit 220 can include a voltage detection chip 222 and a serial communication interface 224;

[0064] The input pin of the voltage detection chip 222 is connected to the output end of the fan gear voltage input circuit 212; the voltage detection chip 222 is connected to the gear judgment circuit through the serial communication interface 224.

[0065] Specifically, as shown in Figure 3 Taking the example of the gear judgment circuit realized by MCU, the fan gear voltage input circuit 212 in the fan input port 210 transmits the data obtained by each input pin to the voltage detection chip 222, and then the current detection voltage is obtained by the voltage detection chip 222;

[0066] The voltage detection chip 222 in the present application can be connected to the MCU through the serial communication interface 224, that is, the present application provides a serial communication interface 224 to facilitate the transmission of measurement parameters (such as current detection voltage) between the present application and external MCU, all measurement parameters can be read out through the serial communication interface 224.

[0067] In one specific embodiment, the serial communication interface 224 can be an SPI communication interface; the SPI communication interface can be integrated in the internal of the voltage detection chip 222.

[0068] Specifically, the voltage detection chip 222 in the present application can internally integrate an SPI (Serial Peripheral Interface) serial communication interface and work in a slave mode; that is, the voltage detection chip 222 in the present application can provide an SPI interface to facilitate the transmission of metering parameters between the external MCU; for example, the current detection voltage can be read out through the SPI interface.

[0069] In a specific embodiment, the voltage detection chip 222 can be an electric energy metering chip;

[0070] The output ends of the fan gear voltage input circuit 212 are respectively connected to the voltage channel positive analog input pin and the voltage channel negative analog input pin of the electric energy metering chip.

[0071] Specifically, the present application can use a corresponding electric energy special metering chip to realize the related functions of the voltage detection chip 222; for example, the electric energy metering chip can provide fundamental wave parameter metering to realize the measurement of fundamental wave active power, fundamental wave active energy, fundamental wave current, voltage effective value, etc.

[0072] In a specific embodiment, as shown in Figure 4 The electric energy metering chip can be a three-phase electric energy metering chip.

[0073] Specifically, the present application can support the detection of fan coil when using different phases (A, B, and C phases) for power supply; wherein, as shown in Figure 4 The electric energy metering chip in the present application can be implemented by using a high-precision three-phase electric energy special metering chip and can be applicable to three-phase three-wire and three-phase four-wire applications.

[0074] Among them, Figure 4 V1P~V6P in the middle respectively represent the positive analog input pins of each voltage channel in the electric energy metering chip, and V1N~V6N respectively represent the negative analog input pins of each voltage channel. Each input pin is connected to the corresponding fan gear voltage input circuit 212. Further, Figure 4 Among them, 2 control lines and 2 data lines: CS / SCLK / DIN / DOUT can be used as the SPI serial communication interface internally integrated in the electric energy metering chip, work in a slave mode, and be used for connecting with the external MCU (i.e. the gear judgment circuit); specifically, CS is the chip selection end, DIN is the serial data input pin, DOUT is the serial data output pin, and SCLK is the serial clock pin.

[0075] It should be noted that according to actual application, as Figure 4The three-phase electric energy metering chip in the application can include 6-channel input pins; wherein, V1P / V1N represents the positive and negative analog input pins of channel 1 (current channel); V3P / V3N represents the positive and negative analog input pins of channel 3 (current channel); V5P / V5N represents the positive and negative analog input pins of channel 5 (current channel); V2P / V2N represents the positive and negative analog input pins of channel 2 (voltage channel); V4P / V4N represents the positive and negative analog input pins of channel 4 (voltage channel); V6P / V6N represents the positive and negative analog input pins of channel 6 (voltage channel). The application is not limited in this regard.

[0076] In a specific embodiment, as shown in Figure 5 The fan input port 210 can include a 6-way fan gear voltage input circuit 212; the fan gear voltage input circuit 212 can include a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1 and a second capacitor C2.

[0077] One end of the first resistor R1 is used to connect any gear line of the fan coil to be detected, and the other end is connected to one end of the second resistor R2; the other end of the second resistor R2 is used to connect the positive analog input pin of the voltage channel of the electric energy metering chip, and is respectively connected to one end of the third resistor R3 and one end of the first capacitor C1; the other end of the third resistor R3 and the other end of the first capacitor C1 are both grounded.

[0078] The fourth resistor R4 and one end of the second capacitor C2 are both used to connect the negative analog input pin of the voltage channel of the electric energy metering chip, and the other end is grounded.

[0079] Specifically, the fan input port 210 of the application can include a 6-way fan gear voltage input circuit 212, that is, the application can detect the gear state of 6 fan coils at the same time; wherein, the application detects 3 gear states of the fan coil through a single gear line, and can detect 6-way fan coils at the same time, which is simple to construct, simple to detect the circuit and low in cost, greatly simplifying the fan coil gear detection operation.

[0080] Further, taking the voltage detection circuit realized by the voltage detection chip shown in Figure 4 as an example, the specific structure of the fan input port 210 for connecting each fan coil in the application is illustrated, as shown in Figure 6 The 6-way fan coil input port can be realized by the fan input port 210 proposed by the application. At the same time, as shown in Figure 7a the first fan gear voltage input, the second fan gear voltage input and the third fan gear voltage input; as shown in Figure 7bAs shown, the fourth fan gear voltage input, the fifth fan gear voltage input and the sixth fan gear voltage input. That is, the six fan gear voltage inputs are respectively connected to Figure 4 the corresponding input pins of the middle voltage detection chip.

[0081] The above fan coil gear detection circuit connects each fan coil through a fan input port, which includes a plurality of fan gear voltage input circuits. One gear line (i.e. any one of the high, medium and low gear lines) of the fan coil is connected to the fan gear voltage input circuit, the current operating state voltage of the fan coil is detected through the voltage detection circuit, and then output to the gear judgment circuit to provide gear determination data for the gear judgment circuit. The present application only needs to use one detection line to detect the gear size of the fan, which can simultaneously detect the gear state of multiple fan coils, is simple to construct, has a simple detection circuit and low cost, and greatly simplifies the fan coil gear detection operation.

[0082] Further, the present application can detect the three gear states of the fan coil through a single gear line, and can simultaneously detect multiple fan states. In addition, the present application can solve the problem of detection misjudgment caused by long-term operation of the fan or large voltage fluctuation of the power grid, and can also detect whether the fan coil is online to achieve anti-theft, and support detection of fan coils powered by different phases (A, B, C phases).

[0083] In one embodiment, as shown in Figure 8 , a fan coil gear detection circuit is provided, which is applied to Figure 1 , for example, and includes a fan input port, a voltage detection circuit and an output interface circuit connected in turn; the voltage detection circuit is used to connect the gear judgment circuit through the output interface circuit;

[0084] The fan input port includes a plurality of fan gear voltage input circuits; the input end of the fan gear voltage input circuit is used to connect any gear line of the fan coil to be detected, and the output end is connected to the voltage detection circuit; the fan gear voltage input circuit obtains the current operating state data of the fan coil to be detected and outputs it;

[0085] The voltage detection circuit receives and processes the current operating state data and outputs the current detection voltage of the fan coil to be detected; the voltage detection circuit transmits the current detection voltage to the gear judgment circuit through the output interface circuit; the current detection voltage is used to indicate the gear judgment circuit to confirm the current gear of the fan coil to be detected.

[0086] Specifically, the fan coil gear detection circuit in the application can detect the voltage of the current running state of the fan through the voltage detection circuit by connecting one of the fan coil gear lines (i.e. high, medium, and low gear lines) to the corresponding fan gear voltage input circuit in the fan input port, and then outputting the current detection voltage to the gear judgment circuit through the output interface circuit to provide gear determination data for the next level MCU (i.e. the gear judgment circuit).

[0087] In a specific embodiment, the output interface circuit can include a clock oscillator and an isolation component; one end of the isolation component is connected to the voltage detection circuit, and the other end is used to connect the gear judgment circuit.

[0088] Specifically, the output interface circuit in the application can include a clock oscillator and an isolation component; the isolation component can provide electrical isolation voltage required by the circuit, and further can realize digital channel direction configuration selection, output default high and low level selection, etc. The isolation component in the application can provide a wide power supply range, thereby directly connecting most digital interfaces of MCUs, etc., and can provide a level conversion function.

[0089] In a specific embodiment, as shown in Figure 9 , the voltage detection circuit can include a voltage detection chip connected to the output end of the fan gear voltage input circuit; the isolation component includes a first dual-channel digital isolator and a second dual-channel digital isolator;

[0090] The output end of the first dual-channel digital isolator is respectively connected to the chip select end of the voltage detection chip and the serial clock pin of the voltage detection chip; the input end of the first dual-channel digital isolator is used to connect the gear judgment circuit;

[0091] One input end of the second dual-channel digital isolator is connected to the serial data output pin of the voltage detection chip, and one output end is used to connect the gear judgment circuit; the other input end of the second dual-channel digital isolator is used to connect the gear judgment circuit, and the other output end is connected to the serial data input pin of the voltage detection chip.

[0092] Specifically, the output interface circuit in the application can include a clock oscillator, a first dual-channel digital isolator, and a second dual-channel digital isolator. The clock oscillator can be implemented by ME2610. The first dual-channel digital isolator and the second dual-channel digital isolator can both be implemented by Nsi8120N0.

[0093] The structure of the output interface circuit in the application will be explained below by taking the voltage detection circuit implemented by the voltage detection chip as shown in Figure 10 . Figure 4 Figure 10 ​As shown, the chip U10 is a first dual-channel digital isolator, the output end OUTA of the first dual-channel digital isolator U10 is connected to the chip select end CS of the voltage detection chip, and the output end OUTB of the first dual-channel digital isolator U10 is connected to the serial clock pin SCLK of the voltage detection chip; the input end INA and the input end INB of the first dual-channel digital isolator are both used to connect the gear judgment circuit (MCU).

[0094] As shown in Figure 10 , the chip U15 is a second dual-channel digital isolator; one input end VIA of the second dual-channel digital isolator U15 is connected to the serial data output pin DOUT of the voltage detection chip, and one output end VOA is used to connect the gear judgment circuit; the other input end VIB of the second dual-channel digital isolator is used to connect the gear judgment circuit, and the other output end VOB is connected to the serial data input pin DIN of the voltage detection chip.

[0095] It should be noted that, Figure 10 The MCU processing circuit, MCU processing module and the like in the above embodiment can refer to the gear judgment circuit; the gear judgment circuit in the present application can confirm the current running gear of the fan coil to be detected based on the current detection voltage; in one example, the gear judgment circuit can use MCU or single-chip microcomputer to realize the corresponding functions. Meanwhile, the output interface circuit in the present application can be applied to the above-mentioned embodiments, and the present application does not limit this.

[0096] The above-mentioned fan coil gear detection circuit accesses each fan coil through a fan input port, the fan input port includes a plurality of fan gear voltage input circuits, one gear line (i.e. any one of the high, medium and low gear lines) of the fan coil is accessed to the fan gear voltage input circuit, the voltage of the current running state of the fan is detected through the voltage detection circuit, and then output to the gear judgment circuit to provide gear determination data for the gear judgment circuit. The present application only needs to use one detection line to detect the gear size of the fan, can detect the gear state of multiple fan coils at the same time, is simple in construction, simple in detection circuit and low in cost, and greatly simplifies the fan coil gear detection operation.

[0097] Further, the present application can detect the three gear states of the fan coil through a single gear line, can detect multiple fan states at the same time, can solve the problem of detection misjudgment caused by long-term operation of the fan or large voltage fluctuation of the power grid, can detect whether the fan coil is online to realize anti-theft, and supports detection of the fan coil when different phases (A, B and C phases) are used for power supply.

[0098] In one embodiment, as shown in Figure 1 , a fan gear detection system is provided, which includes a gear judgment circuit and a fan coil gear detection circuit connected to the gear judgment circuit as described above.

[0099] The fan coil gear detection circuit is used for connecting each fan coil respectively.

[0100] In one specific embodiment, the gear determination circuit can include an MCU;

[0101] The fan coil gear detection circuit outputs the current detection voltage of each fan coil;

[0102] The MCU can confirm the current running gear of each fan coil according to each current detection voltage.

[0103] The fan gear detection system of the present application can detect the three gear states of the fan coil through a single gear line, can simultaneously detect multiple fan states, can solve the problem of detection misjudgment caused by long-term operation of the fan or large voltage fluctuation of the power grid, and can also detect whether the fan coil is online to achieve anti-theft.

[0104] Those skilled in the art can understand that, Figures 1-10 The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the equipment or components to which the scheme of the present application is applied. The specific equipment can include more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0105] In the description of the present application, the description of the terms "some embodiments", "other embodiments", "ideal embodiments" and the like means that the specific features, structures, materials or characteristics described in combination with the embodiments or examples are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0106] The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0107] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A fan coil gear detection circuit, characterized in that, The fan input port includes a fan input port, a voltage detection circuit; the voltage detection circuit is used for connecting the gear judgment circuit; The fan input port includes a fan input port, a voltage detection circuit; the voltage detection circuit is used for connecting the gear judgment circuit; The fan input port includes a fan input port, a voltage detection circuit; the voltage detection circuit is used for connecting the gear judgment circuit; The voltage detection circuit receives and processes the current running state data, and outputs the current detection voltage of the fan coil to be detected; the current detection voltage is used to indicate the gear judgment circuit to confirm the current running gear of the fan coil to be detected; The fan coil gear detection circuit further includes an output interface circuit; the output interface circuit includes a clock oscillator and an isolation component; one end of the isolation component is connected with the voltage detection circuit, and the other end is used for connecting the gear judgment circuit; The voltage detection circuit includes a voltage detection chip connected with the output end of the fan gear voltage input circuit; the isolation component includes a first double-channel digital isolator and a second double-channel digital isolator; The output end of the first double-channel digital isolator is connected with the chip selection end of the voltage detection chip and the serial clock pin of the voltage detection chip respectively; the input end of the first double-channel digital isolator is used for connecting the gear judgment circuit; One input end of the second double-channel digital isolator is connected with the serial data output pin of the voltage detection chip, and the other input end is used for connecting the gear judgment circuit; the other output end of the second double-channel digital isolator is connected with the serial data input pin of the voltage detection chip; The voltage detection circuit includes a voltage detection chip and a serial communication interface; the input pin of the voltage detection chip is connected with the output end of the fan gear voltage input circuit; the voltage detection chip is connected with the gear judgment circuit through the serial communication interface; the voltage detection chip is an electric energy metering chip; The fan input port includes six fan gear voltage input circuits; the fan gear voltage input circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor and a second capacitor; One end of the first resistor is used for connecting any gear line of the fan coil to be detected, and the other end is connected with one end of the second resistor; the other end of the second resistor is used for connecting the voltage channel positive analog input pin of the electric energy metering chip, and is connected with one end of the third resistor and one end of the first capacitor respectively; the other end of the third resistor and the other end of the first capacitor are grounded; The fourth resistor and one end of the second capacitor are used for connecting the voltage channel negative analog input pin of the electric energy metering chip, and the other end is grounded; 2. The fan coil register detection circuit of claim 1, wherein, The gear judgment circuit adopts a gear self-learning mode to confirm the current running gear of the fan coil to be detected. The serial communication interface is an SPI communication interface; the SPI communication interface is integrated in the internal part of the voltage detection chip.

3. The fan coil register detection circuit of claim 1 or 2, wherein, The output ends of the fan gear voltage input circuit are connected with the positive voltage channel analog input pin and the negative voltage channel analog input pin of the electric energy metering chip respectively.

4. The fan coil register detection circuit of claim 3, wherein, The electric energy metering chip is a three-phase electric energy metering chip.

5. A fan speed detection system, characterized by, The fan coil gear detection circuit according to any one of claims 1 to 4 is connected with a gear judgment circuit. The fan coil gear detection circuit is used for connecting each fan coil respectively.

6. The fan speed detection system of claim 5, wherein, The gear judgment circuit comprises an MCU. The fan coil gear detection circuit outputs the current detection voltage of each fan coil. The MCU confirms the current running gear of each fan coil according to the current detection voltage of each fan coil respectively.

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