Input control circuit, controller and air conditioner

Abstract

The utility model discloses an input control circuit, a controller and an air conditioner, and the input control circuit comprises an input end which is connected with sensors of different signal types and is used for accessing input signals sent by the sensors of different signal types; the switching device group is connected with the input end; and the main control unit is connected with the switching device group and is used for identifying the signal type of the input signal accessed by the input end and controlling the on-off switching of each switching device in the switching device group according to the signal type of the input signal so as to realize different signal sampling modes. According to the invention, the signal type of the input signal can be automatically identified and the corresponding signal adopting mode can be configured, so that the signal type of the accessed sensor is matched with the signal adopting mode of the input control circuit, automatic matching of the input signal is realized, and the operation convenience and the overall stability are greatly improved.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to an input control circuit, a controller and an air conditioner. Background Art

[0002] Direct digital control (DDC) controllers are currently widely used in building automation, industrial automation, and other fields. With the continuous development of technology, universal inputs and outputs are becoming a trend in DDC controllers, and universal inputs and outputs are gradually becoming the mainstream control circuits of DDC controllers. This universal design enables DDC controllers to support a variety of input signal types.

[0003] However, this universal design also presents new challenges. Because DDC controllers must support multiple signal types, debugging engineers must manually select and match sensor inputs with DDC controller inputs when configuring the system. This process often involves complex hardware DIP switches or jumper configurations, as well as software-based signal type selection. Incorrect hardware DIP switches or jumper configurations, or improper software signal type selections, can lead to erroneous data read by the DDC controller, potentially causing sensor or controller malfunction or even product damage. This not only increases the difficulty and cost of system debugging but also reduces system reliability and usability. Utility Model Content

[0004] The embodiments of the present application provide an input control circuit, a controller, and an air conditioner, which can automatically identify the signal type of the input signal and configure the corresponding signal adoption mode so that the signal type of the connected sensor matches the signal adoption mode of the input control circuit, thereby achieving automatic matching of the input signal and greatly improving the ease of operation and overall stability.

[0005] In a first aspect, an embodiment of the present application provides an input control circuit, comprising:

[0006] An input terminal, connected to sensors of different signal types, for receiving input signals emitted by the sensors of different signal types;

[0007] a switch device group connected to the input end;

[0008] The main control unit is connected to the switching device group and is used to identify the signal type of the input signal connected to the input end, and control the on-off switching of each switching device in the switching device group according to the signal type of the input signal to achieve different signal sampling modes.

[0009] In a second aspect, an embodiment of the present application provides a controller comprising the input control circuit described in the first aspect.

[0010] In a third aspect, an embodiment of the present application provides an air conditioner, comprising the controller described in the second aspect.

[0011] The present application provides an input control circuit, a controller, and an air conditioner. The input control circuit includes an input terminal, a switch device group, and a main control unit. The input terminal is connected to sensors of different signal types and is used to receive input signals emitted by sensors of different signal types. The switch device group is connected to the input terminal. The main control unit is connected to the switch device group and is used to identify the signal type of the input signal received by the input terminal and control the on-off switching of each switch device in the switch device group according to the signal type of the input signal to achieve different signal sampling modes. The present application can automatically identify the signal type of the input signal and control the on-off switching of the switch device group through the main control unit to configure the signal adoption mode corresponding to the signal type of the input signal so that the signal type of the connected sensor matches the signal adoption mode of the input control circuit, thereby achieving automatic matching of the input signal, eliminating manual hardware configuration and software secondary configuration, improving the usability of the product, reducing the problem of the entire system not being able to work normally due to improper use, and greatly improving the ease of operation and overall stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 A circuit diagram of an input control circuit provided in an embodiment of the present application.

[0014] Figure 2 Schematic diagram of the input control system provided in an embodiment of the present application.

[0015] Figure 3 A schematic diagram of the adaptive detection logic provided in an embodiment of the present application.

[0016] Figure 4 A schematic diagram of a controller provided in an embodiment of the present application.

[0017] Figure 5 A schematic diagram of an air conditioner provided in an embodiment of the present application. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0019] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0020] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0021] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0022] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0023] It should be noted that the order of description of the following embodiments does not limit the priority order of the embodiments.

[0024] The present application embodiment provides an input control circuit. Figure 1 , Figure 1 The input control circuit 100 may include an input terminal 10 , a switch device group 20 , and a main control unit 30 .

[0025] The input terminal 10 (UI) is connected to sensors of different signal types and is used to receive input signals from sensors of different signal types.

[0026] For example, input terminal 10 is an interface between the input control circuit and the external sensor, and supports the input of various signal types. These signal types include, but are not limited to, digital input (DI) signals, voltage signals (e.g., 0-10V range), current signals (e.g., 4-20mA or 0-20mA range), and resistance signals (e.g., NTC10K thermistor signals, Pt1000 platinum thermal resistor signals, etc.).

[0027] The switch device group 20 is connected to the input terminal 10 .

[0028] For example, the switch device group 20 may be composed of a plurality of controllable switch devices, such as triodes, metal-oxide-semiconductor field-effect transistors (MOSFETs), or solid-state relays. These switch devices are switched on and off according to the control signal of the main control unit 30 to implement different signal sampling modes.

[0029] Among them, the main control unit 30 (Microcontroller Unit, MCU) is connected to the switching device group 20, and is used to identify the signal type of the input signal connected to the input terminal 10, and control the on-off switching of each switching device in the switching device group 20 according to the signal type of the input signal to achieve different signal sampling modes.

[0030] For example, the main control unit 30 is the core component of the entire input control circuit 100, responsible for identifying the signal type of the input signal and controlling the on / off switching of the switching device group 20 based on the signal type. It can realize intelligent processing of the input signal through built-in adaptive detection logic. The main control unit 30 has powerful signal recognition capabilities and can accurately determine the signal type of the input signal. Once the signal type is identified, it will send the corresponding control signal to the switching device group 20 according to the preset sampling mode and control strategy. The main control unit 30 can also communicate and interact with other devices or external equipment to implement more complex control logic and data transmission functions. This communication and interaction capability enables the input control circuit to be integrated into a wider system environment and play a greater role.

[0031] The input control circuit 100 realizes flexible sampling and processing of input signals of various signal types through its carefully designed input terminal 10, switching device group 20 and main control unit 30. It can automatically identify the signal type of the input signal and control the on and off of the switching device group 20 through the main control unit 30 to configure the signal adoption mode corresponding to the signal type of the input signal, so that the signal type of the connected sensor matches the signal adoption mode of the input control circuit 100, thereby realizing automatic matching of the input signal, eliminating manual hardware configuration and software secondary configuration, improving the usability of the product, reducing the problem of the entire system not being able to work normally due to improper use, and greatly improving the ease of operation and overall stability.

[0032] In some embodiments, the main control unit 30 is configured to identify the signal type of the input signal received by the input terminal 10, including:

[0033] Obtaining a voltage value of the sampling channel terminal 33 of the main control unit 30, and if the voltage value is greater than or equal to a first voltage threshold, identifying the signal type of the input signal connected to the input terminal 10 as a current signal; or

[0034] If the voltage value is less than the first voltage threshold and greater than the second voltage threshold, the signal type of the input signal connected to the input terminal 10 is identified as a voltage signal, wherein the first voltage threshold is greater than the second voltage threshold; or

[0035] If the voltage value is less than the first voltage threshold and less than or equal to the second voltage threshold, the resistance value of the sampling channel terminal 33 is obtained; if the resistance value is greater than or equal to the first resistance threshold, the signal type of the input signal connected to the input terminal 10 is identified as a digital input signal in a disconnected state; or

[0036] If the resistance value is less than the first resistance threshold, less than or equal to the second resistance threshold, and greater than or equal to the third resistance threshold, then the signal type of the input signal connected to the input terminal 10 is identified as a resistance signal, wherein the first resistance threshold is greater than the second resistance threshold, and the second resistance threshold is greater than the third resistance threshold; or

[0037] If the resistance value is less than the third resistance threshold, or the resistance value is greater than the second resistance threshold and less than the first resistance threshold, the signal type of the input signal connected to the input terminal 10 is identified as a digital input signal in a closed state.

[0038] In some embodiments, the main control unit 30 is further configured to:

[0039] If the resistance value is greater than a fourth resistance threshold, the resistance signal is identified as a thermistor signal; or

[0040] If the resistance value is less than or equal to the fourth resistance threshold, the resistance signal is identified as a platinum thermal resistance signal;

[0041] The fourth resistance threshold is greater than the third resistance threshold and less than the second resistance threshold.

[0042] In some embodiments, the main control unit 30 is further configured to configure the sampling channel end 33 to a signal sampling mode corresponding to the signal type according to the signal type of the input signal connected to the input end 10, and save the mode configuration parameters corresponding to the sampling channel end 33.

[0043] For example, after the main control unit 30 is started, it first initializes the sampling channel terminal 33 and prepares for signal detection. The system is in a standby state, waiting for the input control circuit to be powered on and complete self-test.

[0044] The main control unit 30 then reads the voltage value at the sampling channel terminal 33. If the voltage value is greater than or equal to a preset first voltage threshold (e.g., 10.2V), the main control unit 30 determines that the signal type connected to the input terminal 10 is a current signal. At this point, the main control unit 30 configures the sampling channel terminal 33 to the current sampling mode and prepares for subsequent current signal detection.

[0045] If the voltage value is less than the first voltage threshold but greater than the second voltage threshold (eg, 0.1V), the signal type connected to the input terminal 10 is determined to be a voltage signal. The main control unit 30 will accordingly configure the sampling channel terminal 33 to a voltage sampling mode.

[0046] When the voltage value is less than or equal to the second voltage threshold, it is necessary to further determine the signal type based on the resistance value.

[0047] If the resistance value of the sampling channel terminal 33 is greater than or equal to the first resistance threshold (eg, 1000KΩ), this generally indicates that the input terminal is not connected to a signal or is connected to a digital input signal in an off state. The main control unit 30 will perform corresponding processing based on this judgment.

[0048] Resistance signal identification: If the resistance value is less than the first resistance threshold but greater than or equal to the third resistance threshold (e.g., 500Ω) and less than or equal to the second resistance threshold (e.g., 500KΩ), the system determines that the input signal is a resistance signal. Next, the main control unit 30 further determines the range of the resistance value to determine whether it is a thermistor signal or a platinum resistance signal. If the resistance value is greater than the fourth resistance threshold (e.g., 1.5KΩ, and the fourth resistance threshold is greater than the third resistance threshold but less than the second resistance threshold), it is identified as a thermistor signal (e.g., NTC10K). If the resistance value is less than or equal to the fourth resistance threshold, it is identified as a platinum resistance signal (e.g., Pt1000).

[0049] If the resistance value is less than the third resistance threshold, or is within the non-standard range between the second and first resistance thresholds, it is determined that the input terminal is connected to a closed digital input signal. This may be due to special circuit design or external device connection.

[0050] The main control unit 30 configures the sampling channel terminal 33 (MCU_ADC) to the corresponding signal sampling mode according to the identified signal type and saves the mode configuration parameters corresponding to the sampling channel terminal 33. This ensures that the system can correctly and efficiently process different types of input signals.

[0051] The system may periodically re-detect the type of input signal to adapt to changes in external signals or the connection of new devices. The main control unit 30 can dynamically adjust the sampling mode according to the new detection results to maintain the flexibility and accuracy of the system.

[0052] Through the process of the main control unit 30 identifying the input signal type, the main control unit 30 can intelligently identify the signal type connected to the input terminal 10 and automatically configure the sampling channel terminal 33 according to the identification result, thereby achieving efficient signal processing and data acquisition.

[0053] In some embodiments, the main control unit 30 is configured to generate a first control signal and a second control signal according to a signal type of an input signal, and send the first control signal to the switch device group 20 via a first control terminal 31 (10KCI) of the main control unit 30, and send the second control signal to the switch device group 20 via a second control terminal 32 (20mACI) of the main control unit 30;

[0054] The switching device group 20 is used to switch on and off each switching device in the switching device group 20 in response to the first control signal and the second control signal to realize different signal sampling modes, including voltage sampling mode, current sampling mode, resistance sampling mode and digital input mode.

[0055] Among them, the main control unit 30 is the core control component of the entire system, which is first responsible for identifying the signal type of the input signal. This identification process can be based on the following Figure 3 The adaptive detection logic shown in the figure determines whether the signal is a voltage signal, a current signal, a resistance signal (such as a thermistor, platinum resistance resistor, etc.), or a digital input signal by measuring and analyzing the input signal's parameters such as voltage, current, or resistance. Once the signal type is determined, the main control unit 30 generates corresponding control signals based on the identification result. These control signals include a first control signal and a second control signal, each of which carries information for instructing the switch device group 20 on which type of on-off switching to perform. The control signal logic table is shown in Table 1 below:

[0056] Table 1

[0057]

[0058] Regarding the information described in Table 1 above, since both the digital input (DI) and the resistor input are passive signal inputs and require internal power, the same sampling circuit can be used to sample the DI and resistor signals. The logic of the corresponding signal switching pins 10KCI (first control terminal) and 20mACI (second control terminal) is 1 and 0. The logic of the voltage signal switching pins 10KCI (first control terminal) and 20mACI (second control terminal) is 0 and 0. The logic of the current signal switching pins 10KCI (first control terminal) and 20mACI (second control terminal) is 0 and 1.

[0059] The main control unit 30 may have multiple control terminals, including a first control terminal 31 and a second control terminal 32 (and possibly other control terminals depending on the complexity of the system design). The first control signal is sent to the switch device group 20 via the first control terminal 31, while the second control signal is sent via the second control terminal 32. This design allows the main control unit 30 to control different parts of the switch device group 20 simultaneously or independently, thereby achieving flexible switching of signal sampling modes.

[0060] The switching device group 20 is a key component connecting the signal input path and the signal processing unit. It contains multiple switching devices, which can be mechanical switches, solid-state relays, field-effect transistors, and other devices. The specific type depends on application requirements and system design considerations. When the switching device group 20 receives the first and second control signals from the main control unit 30, it switches the internal switching devices on and off according to the instructions in the signals. This switching operation enables conversion between different signal sampling modes, allowing the system to accurately collect and process different types of input signals.

[0061] By switching the switch assembly 20 on and off, the system can flexibly implement a variety of signal sampling modes, including but not limited to voltage sampling, current sampling, resistance sampling, and digital input. In voltage sampling mode, the switch assembly 20 directly directs the input signal to the voltage measurement circuit. In current sampling mode, current-to-voltage conversion may be performed using auxiliary components such as current transformers. In resistance sampling and digital input modes, the switch assembly 20 selects appropriate paths and makes conditional judgments based on the signal characteristics.

[0062] In some embodiments, the input control circuit 100 further includes:

[0063] a first resistor R1, wherein a first end of the first resistor R1 is connected to the input terminal 10, and a second end of the first resistor R1 is connected to the sampling channel terminal 33 of the main control unit 30;

[0064] a second resistor R2, wherein a first end of the second resistor R2 is connected to a second end of the first resistor R1;

[0065] a third resistor R3, wherein a first end of the third resistor R3 is connected to the input end 10;

[0066] a fourth resistor R4, wherein a first end of the fourth resistor R4 is connected to the input end 10;

[0067] The switching device group 20 includes:

[0068] A first switching device 21, wherein a first end of the first switching device 21 is connected to the first DC voltage source VDD1, and a second end of the first switching device 21 is connected to the second end of the third resistor R3;

[0069] a second switch device 22, wherein a first end of the second switch device 22 is connected to a third end of the first switch device 21, a second end of the second switch device 22 is grounded (GND), and a third end of the second switch device 22 is connected to a first control end 31 of the main control unit 30;

[0070] a third switch device 23, wherein a first end of the third switch device 23 is connected to the second end of the fourth resistor R4, a second end of the third switch device 23 is grounded (GND), and a third end of the third switch device 23 is connected to the second control end 32 of the main control unit 30;

[0071] a fourth switch device 24 , wherein a first end of the fourth switch device 24 is connected to the second end of the second resistor R2 , and a second end of the fourth switch device 24 is grounded;

[0072] The fifth switching device 25, the first end of the fifth switching device 25 is respectively connected to the third end of the fourth switching device 24 and the second DC voltage source VDD2, the second end of the fifth switching device 25 is grounded (GND), and the third end of the fifth switching device 25 is connected to the second control end 32 of the main control unit 30.

[0073] like Figure 1 As shown, the first switching device 21 may include a first transistor Q1 and a tenth resistor R10. The first end of the first transistor Q1 is connected to a first DC voltage source VDD1 (e.g., 10V), the second end of the first transistor Q1 is connected to the second end of the third resistor R3, and the third end of the first transistor Q1 is connected to the first end of the second switching device 22. The first end of the tenth resistor R10 is connected to the first end of the first transistor Q1, and the second end of the tenth resistor R10 is connected to the first end of the second transistor Q2 via a ninth resistor R9. The first transistor Q1 may be a P-type MOS transistor.

[0074] like Figure 1 As shown, the second switching device 22 may include a second transistor Q2. A first terminal of the second switching device 22 is connected to a third terminal of the first transistor Q1 via a ninth resistor R9. A second terminal of the second transistor Q2 is grounded (GND). A third terminal of the second transistor Q2 is connected to a first control terminal 31 of the main control unit 30. The second transistor Q2 may be an NPP-type triode.

[0075] like Figure 1As shown, the third switching device 23 may include a third transistor Q3 and a sixth resistor R6. The first end of the third transistor Q3 is connected to the second end of the fourth resistor R4, the second end of the third transistor Q3 is grounded (GND), and the third end of the third transistor Q3 is connected to the first end of the sixth resistor R6 and the second control terminal 32 of the main control unit 30. The second end of the sixth resistor R6 is connected to the second end of the third transistor Q3. The third transistor Q3 may be an N-type MOS transistor.

[0076] like Figure 1 As shown, the fourth switching device 24 may include a fourth transistor Q4 and an eighth resistor R8. The first end of the fourth transistor Q4 is connected to the second end of the second resistor R2, the second end of the fourth transistor Q4 is grounded, the third end of the fourth transistor Q4 is connected to the first end of the eighth resistor R8 and the first end of the fifth switching device 25, respectively, and the second end of the eighth resistor R8 is connected to the second end of the fourth transistor Q4. The fourth transistor Q4 may be an N-type MOS transistor.

[0077] like Figure 1 As shown, the fifth switching device 25 may include a fifth transistor Q5, the first end of the fifth transistor Q5 is connected to the third end of the fifth transistor Q5, and the first end of the fifth transistor Q5 is connected to the second DC voltage source VDD2 (such as 5V) through the seventh resistor R7, the second end of the fifth transistor Q5 is grounded (GND), and the third end of the fifth transistor Q5 is connected to the second control end 32 of the main control unit 30.

[0078] In some embodiments, the main control unit 30 is configured to generate a first control signal with a signal value of 0 and a second control signal with a signal value of 0 according to the voltage signal when the main control unit 30 identifies that the signal type of the input signal connected to the input terminal 10 is a voltage signal;

[0079] The switching device group 20 is configured to form a voltage sampling circuit in response to the first control signal and the second control signal by respectively controlling the first switching device 21, the second switching device 22, the third switching device 23, and the fifth switching device 25 to be turned off, and controlling the fourth switching device 24 to be turned on, thereby realizing a voltage sampling mode.

[0080] The voltage sampling circuit is used to sample the target voltage signal in a voltage sampling mode.

[0081] For example, when the input signal is a voltage signal, the input control circuit is in voltage sampling mode, and the voltage signal is connected to the input terminal 10 (UI). The main control unit 30 outputs a first control signal with a signal value of 0 through the first control terminal 31 (10KCI) to control the first transistor Q1 and the second transistor Q2 to be turned off, and outputs a second control signal with a signal value of 0 through the second control terminal 32 (20mACI) to control the third transistor Q3 and the fifth transistor Q5 to be turned off and the fourth transistor Q4 to be turned on, thereby forming a voltage sampling circuit. At this time, the voltage signal is divided by the first resistor R1 and the second resistor R2, and then filtered by the filter device 60 and output to the sampling channel terminal 33 (MCU_ADC). The voltage signal is converted into digital form by the main control unit 30. At this time, the main control unit 30 can obtain the voltage value of the voltage signal based on the obtained voltage signal, so that the input voltage value can be sampled.

[0082] In some embodiments, the main control unit 30 is configured to generate a first control signal with a signal value of 0 and a second control signal with a signal value of 1 according to the current signal when the main control unit 30 identifies that the signal type of the input signal connected to the input terminal 10 is a current signal;

[0083] The switching device group 20 is configured to form a current sampling circuit in response to the first control signal and the second control signal by respectively controlling the first switching device 21, the second switching device 22, and the fourth switching device 24 to be turned off, and respectively controlling the third switching device 23 and the fifth switching device 25 to be turned on, thereby implementing a current sampling mode.

[0084] The current sampling circuit is used to sample the target current signal in the current sampling mode.

[0085] For example, when the input signal is a current signal, the input control circuit is in current sampling mode, and the current signal is connected to the input terminal 10 (UI). The main control unit 30 outputs a first control signal with a signal value of 0 through the first control terminal 31 (10KCI) to control the first transistor Q1, the second transistor Q2, and the fourth transistor Q4 to be turned off, and outputs a second control signal with a signal value of 1 through the second control terminal 32 (20mACI) to control the third transistor Q3 and the fifth transistor Q5 to be turned on, respectively, to form a current sampling circuit. At this time, the current signal is sampled through the fourth resistor R4, and the current is converted into a voltage. After passing through the first resistor R1, it is output to the sampling channel terminal 33 (MCU_ADC) and analog-to-digital conversion is performed by the main control unit 30. At this time, the main control unit 30 can obtain the current value of the current signal based on the obtained voltage signal, so that the input current value can be sampled.

[0086] In some embodiments, the main control unit 30 is configured to generate a first control signal with a signal value of 1 and a second control signal with a signal value of 0 according to the resistance signal when the main control unit 30 identifies that the signal type of the input signal connected to the input terminal 10 is a resistance signal;

[0087] a switching device group 20 for controlling the first switching device 21, the second switching device 22, and the fourth switching device 24 to be turned on, and the third switching device 23 and the fifth switching device 25 to be turned off, in response to the first control signal and the second control signal, to form a resistance sampling circuit to implement a resistance sampling mode;

[0088] The resistance sampling circuit is used to measure the resistance value of the target resistance signal in the resistance sampling mode.

[0089] For example, when the input signal is a resistance signal, the input control circuit is in resistance sampling mode, and the resistance signal is connected to the input terminal 10 (UI). The main control unit 30 outputs a first control signal with a signal value of 1 through the first control terminal 31 (10KCI) to control the first transistor Q1, the second transistor Q2, and the fourth transistor Q4 to turn on, and outputs a second control signal with a signal value of 0 through the second control terminal 32 (20mACI) to control the third transistor Q3 and the fifth transistor Q5 to turn off, respectively, to form a resistance sampling circuit. At this time, the first resistor R1 and the second resistor R2 are connected in series, and the externally connected resistance signal type sensor is connected in parallel with the first resistor R1 and the second resistor R2 in series, and then the third resistor R3 is connected in series. The resistance sampling circuit is powered by the first DC voltage source VDD1, and a voltage signal is obtained across the second resistor R2. The voltage signal is output to the sampling channel terminal 33 (MCU_ADC) and is converted to digital by the main control unit 30. At this time, the main control unit 30 can obtain the resistance value of the externally connected resistance signal type sensor based on the obtained voltage signal, thereby sampling the input resistance value.

[0090] In some embodiments, the main control unit 30 is configured to generate a first control signal with a signal value of 1 and a second control signal with a signal value of 0 according to the digital input signal when the main control unit 30 identifies that the signal type of the input signal connected to the input terminal 10 is a digital input signal;

[0091] a switching device group 20 for controlling the first switching device 21, the second switching device 22, and the fourth switching device 24 to be turned on, and the third switching device 23 and the fifth switching device 25 to be turned off, in response to the first control signal and the second control signal, to form a digital input circuit to implement a digital input mode;

[0092] The digital input circuit is used to read digital input signals in digital input mode.

[0093] For example, when the input signal is a digital input (DI) signal, the input control circuit is in digital input mode, and the DI signal is connected to the input terminal 10 (UI). The main control unit 30 outputs a first control signal with a signal value of 1 through the first control terminal 31 (10KCI) to control the first transistor Q1, the second transistor Q2, and the fourth transistor Q4 to turn on, and outputs a second control signal with a signal value of 0 through the second control terminal 32 (20mACI) to control the third transistor Q3 and the fifth transistor Q5 to turn off, respectively, to form a digital input circuit. At this time, the first resistor R1 and the second resistor R2 are connected in series, and the externally connected resistance signal type sensor is connected in parallel with the first resistor R1 and the second resistor R2 in series, and then connected in series with the third resistor R3. The resistance sampling circuit is powered by the first DC voltage source VDD1, and a voltage signal is then taken across the second resistor R2. The voltage signal is output to the sampling channel terminal 33 (MCU_ADC) and is converted to digital by the main control unit 30. At this time, the main control unit 30 can obtain the resistance value of the externally connected resistance signal type sensor based on the obtained voltage signal, thereby sampling the input resistance value. At this time, when the input terminal 10 (UI) is disconnected, the voltage sampled by the sampling channel terminal 33 (MCU_ADC) is approximately 10V; when the input terminal 10 (UI) is connected, the voltage sampled by the sampling channel terminal 33 (MCU_ADC) is approximately 0V. In this way, the sampling channel terminal 33 (MCU_ADC) can determine whether the input terminal 10 (UI) is connected or disconnected by the maximum and minimum values of the sampled voltage values, thereby realizing digital quantity monitoring.

[0094] In some embodiments, the input control circuit 100 further includes:

[0095] The first circuit protection device 40 has a first terminal connected to the input terminal 10 and a second terminal connected to the ground (GND).

[0096] The first circuit protection device 40 is the first line of defense for the input control circuit 100, protecting it from external transient overvoltages, electrostatic discharge (ESD), and other adverse factors. It quickly responds and clamps excessive voltages, safely dissipating excess energy to ground, thereby protecting subsequent circuits from damage.

[0097] For example, the first circuit protection device 40 may be any one of a transient voltage suppressor (TVS), a semiconductor discharge tube (TSS), a varistor (MOV), and a ceramic gas discharge tube (GDT).

[0098] Transient Voltage Suppressor (TVS): TVS diode is a commonly used overvoltage protection device with the characteristics of fast response, low clamping voltage and large current flow rate. It is very suitable for protecting sensitive electronic components from damage caused by transient overvoltage.

[0099] Semiconductor discharge tube (TSS): has higher surge current withstand capability and is suitable for transient voltage protection with higher energy.

[0100] Varistor (MOV): Limits voltage through nonlinear resistance characteristics and is suitable for protection against continuous overvoltage and lightning overvoltage.

[0101] Ceramic gas discharge tube (GDT): It conducts under high voltage and diverts current to ground. It is suitable for high-energy and high-voltage protection scenarios.

[0102] In some embodiments, the input control circuit 100 further includes:

[0103] The second circuit protection device 50 has a first terminal connected to the third DC voltage source VDD3 (eg, 3.3V), a second terminal connected to the sampling channel terminal 33, and a third terminal connected to the ground (GND).

[0104] The second circuit protection device 50 is located between the sampling channel terminal 33 and the power supply VDD3 to protect the internal circuit from transient overvoltage interference from the power supply or the sampling channel to ensure the accuracy of the sampling data and the stability of the circuit.

[0105] For example, the second circuit protection device 50 may also be selected from devices such as TVS, TSS, MOV, GDT, etc., depending on the protection requirements of the circuit and parameters such as rated voltage and current.

[0106] In some embodiments, the input control circuit 100 further includes:

[0107] The filter device 60 includes a first capacitor C1, a second capacitor C2, and a fifth resistor R5. The first end of the first capacitor C1 is respectively connected to the second end of the first resistor R1 and the first end of the fifth resistor R5. The second end of the first capacitor C1 is grounded (GND). The first end of the second capacitor C2 is respectively connected to the sampling channel end 33 and the second end of the fifth resistor R5. The second end of the second capacitor C2 is grounded (GND).

[0108] The filter device 60 forms a simple low-pass filter by combining the first capacitor C1, the second capacitor C2 and the fifth resistor R5, which is used to filter out high-frequency noise and interference in the input signal to improve the accuracy and stability of signal sampling.

[0109] The first capacitor C1 and the second capacitor C2 are usually electrolytic or ceramic capacitors, which are used to filter out low-frequency and high-frequency noise. C1 mainly filters low-frequency noise, while C2 has a better suppression effect on high-frequency noise.

[0110] The fifth resistor R5 is used in conjunction with the capacitors C1 and C2 to form an RC filter network to smooth the signal and reduce ripples and spikes.

[0111] In input control circuit 100, the rational configuration of first circuit protection device 40 and second circuit protection device 50 effectively enhances the circuit's anti-interference capability and reliability. Furthermore, the introduction of filter device 60 further improves signal sampling quality. These components work together to ensure that input control circuit 100 operates stably and accurately in a variety of complex environments.

[0112] For example, the seventh resistor R7 is usually connected in series with other components in the circuit (such as other resistors, power supplies or signal sources) to divide the voltage in the circuit to ensure that the voltage received by the subsequent circuit (the sampling channel terminal 33 of the main control unit 30) is within a suitable range. For example, the seventh resistor R7 can also play a role in limiting current to prevent excessive current from damaging circuit components. For example, the seventh resistor R7 can also be used to adjust the amplitude or shape of the signal so that the signal can be correctly processed and recognized by other circuit components (such as an analog-to-digital converter or an amplifier). In certain cases, the seventh resistor R7 can also serve as a protection element to prevent circuit damage caused by sudden or abnormal changes in the external voltage (the second DC voltage source VDD2).

[0113] For example, the ninth resistor R9 can be used to perform impedance matching with other components in the circuit (such as a signal source or a load) to reduce signal reflection and distortion and improve the quality of signal transmission.

[0114] like Figure 2 The schematic diagram of the input control system provided by the embodiment of the present application is shown. The input control system 1000 can be composed of multiple independent input control circuits. Each input control circuit is designed with specific functions and structures to achieve automatic matching and processing of input signals.

[0115] Each input control circuit (e.g., input control circuit 1, input control circuit 2, ..., input control circuit N, etc.) is equipped with a corresponding input terminal (e.g., UI-1, UI-2, ..., UI-N, etc.) and a main control unit (e.g., main control unit 1, main control unit 2, ..., main control unit N, etc.). This design ensures that each input terminal can independently perform signal processing and control through its corresponding main control unit.

[0116] Each independent input control circuit (such as input control circuit N, etc.) has built-in adaptive detection logic. This logic can automatically identify the signal type of the input signal connected to the corresponding input terminal (such as UI-N). This automatic identification function greatly improves the flexibility and adaptability of the circuit, enabling the system to handle a variety of different types of input signals. Once the signal type of the input signal is identified, the corresponding main control unit (such as main control unit N) will control the on and off of the switching device group in the input control circuit. The purpose of this step is to configure a signal adoption mode in the input control circuit that matches the signal type of the input signal. In this way, the system can ensure that the signal type of the sensor connected to the input terminal fully matches the signal adoption mode of the input control circuit, thereby achieving automatic matching and efficient processing of the input signal.

[0117] For example, although each input control circuit is relatively independent, main control unit 1 and main control unit 2 can still be connected via a signal line. This design may be used to achieve communication or collaborative work between main control units, so as to share information or coordinate control strategies when needed.

[0118] In some embodiments, the main control unit 30 is used to identify the signal type of the input signal connected to the input terminal 10 based on the adaptive detection logic. Figure 3 , the adaptive detection logic provided by the embodiment of the present application is as follows:

[0119] S1: The main control unit 30 controls the input control circuit to enter an initial state after powering on, awaiting adaptive configuration commands. For example, when the input control circuit is powered on, the system first enters a preset initial state. In this state, the system does not perform any specific sampling or detection tasks, but instead awaits external adaptive configuration commands to determine the subsequent detection process.

[0120] In step S2, the main control unit 30 controls the input control circuit to default to the voltage detection state after power-up. For example, as a default behavior after power-up, the system first assumes that all input signals are voltage signals and prepares to perform voltage detection. This ensures that the system can process input signals in a safe and universal manner before receiving explicit configuration commands.

[0121] S3 , the main control unit 30 reads the voltage value V of the channel terminal N(+1).

[0122] S4, the main control unit 30 determines that the voltage value V ≥ the first voltage threshold V TH1 For example, the first voltage threshold V TH1 is 10.2 V or 10 V. If so, execute S5; if not, execute S11.

[0123] S5 , the main control unit 30 preliminarily determines that the input signal is a current signal.

[0124] S6, the control logic of the main control unit 30 switches to the current sampling mode.

[0125] S7 , the main control unit 30 reads the input signal again.

[0126] At step S8, the main control unit 30 determines whether the sampled value corresponding to the input signal meets the requirements of the current sensor. For example, the main control unit 30 determines whether the sampled value corresponding to the input signal is within the sampling range of the current sensor. If not, the main control unit 30 executes step S9; if so, the main control unit 30 executes step S10.

[0127] S9, the main control unit 30 prompts a fault.

[0128] S10: The main control unit 30 confirms again that the input signal is a current signal, and configures the sampling channel terminal N to a current sampling mode, and then executes S23.

[0129] S11, the main control unit 30 determines that the voltage value V is less than the second voltage threshold V TH2 For example, the second voltage threshold V TH2 is 0.1V or 0V. If not, execute S12; if so, execute S13.

[0130] S12: The main control unit 30 confirms that the input signal is a voltage signal and configures the sampling channel terminal N to a voltage sampling mode. Then, S23 is executed.

[0131] S13 , the main control unit 30 preliminarily determines whether the input signal is a resistance signal or a DI signal.

[0132] S14 , the main control unit 30 controls the logic to switch to the resistance sampling mode, starts the internal power supply, and reads the resistance value R of the sampling channel terminal N.

[0133] S15, the main control unit 30 determines that the resistance value R is greater than or equal to the first resistance threshold R TH1 For example, the first resistance threshold R TH1 If yes, execute S16; if no, execute S17.

[0134] S16: The main control unit 30 preliminarily determines that no signal is input to the input terminal, or that the input signal input to the input terminal is a digital input signal in a disconnected state, and then executes S23.

[0135] S17, the main control unit 30 determines the third resistance threshold R TH3 ≤Resistance value R≤Second resistance threshold R TH2 For example, the third resistance threshold R TH3is 500Ω, the second resistance threshold R TH2 If not, execute S18; if so, execute S19.

[0136] In step S18, the main control unit 30 determines that the signal type of the input signal connected to the input terminal is a digital input signal in a closed state, and then executes step S23.

[0137] S19 , the main control unit 30 confirms that the input signal is a resistance signal.

[0138] S20, the main control unit 30 determines that the resistance value R is greater than the fourth resistance threshold R TH4 For example, the fourth resistance threshold R TH4 If yes, execute S21; if no, execute S22.

[0139] In step S21, the main control unit 30 identifies the resistance signal as a thermistor signal, such as an NTC10K signal, and then executes step S23.

[0140] In step S22, the main control unit 30 identifies the resistance signal as a platinum resistance thermometer signal, such as a Pt1000 signal, and then executes step S23.

[0141] S23, the main control unit 30 saves the mode configuration parameters corresponding to the sampling channel terminal N. Regardless of whether the detected signal is a current signal, a voltage signal, a resistance signal, or a DI signal, the system will save the mode configuration parameters corresponding to the sampling channel terminal N so that the correct configuration can be directly applied when the channel is subsequently used.

[0142] S24, the main control unit 30 determines whether the channel number N of the sampling channel end N currently being detected is the maximum channel number; if so, it means that all channels have been detected, and then execute S25; if not, return to execute S3 to continue detecting the next channel.

[0143] S25: The main control unit 30 prompts the user to confirm the specific parameter range and save the relevant settings. After all channels have been tested, the system prompts the user to confirm the specific parameter range and save the relevant settings. This is to ensure that the user understands and confirms the final configuration of the system.

[0144] S26, the main control unit 30 ends the adaptive detection logic. At this point, the system has automatically configured all sampling channels according to the type of input signal, and the system enters a normal working state or waits for the next configuration command.

[0145] An embodiment of the present application provides an input control circuit 100, which includes an input terminal 10, a switch device group 20, and a main control unit 30. The input terminal 10 is connected to sensors of different signal types and is used to receive input signals from sensors of different signal types. The switch device group 20 is connected to the input terminal 10. The main control unit 30 is connected to the switch device group 20 and is used to identify the signal type of the input signal received by the input terminal 10 and control the on-off switching of each switch device in the switch device group 20 according to the signal type of the input signal to achieve different signal sampling modes. The embodiment of the present application can automatically identify the signal type of the input signal and control the on-off switching of the switch device group 20 through the main control unit 30 to configure the signal sampling mode corresponding to the signal type of the input signal so that the signal type of the connected sensor matches the signal sampling mode of the input control circuit 100, thereby achieving automatic matching of the input signal, eliminating manual hardware configuration and software secondary configuration, improving product usability, reducing the problem of the entire system not functioning properly due to improper use, and significantly improving operational simplicity and overall stability.

[0146] In order to implement the above embodiment, the embodiment of the present application also proposes a controller.

[0147] See also Figure 4 , Figure 4 A schematic diagram of a controller provided in an embodiment of the present application, including the input control circuit in the above embodiment.

[0148] The controller of the embodiment of the present application can automatically identify the signal type of the input signal, and control the on and off of the switching device group through the main control unit to configure the signal adoption mode corresponding to the signal type of the input signal, so that the signal type of the connected sensor matches the signal adoption mode of the input control circuit, thereby realizing automatic matching of the input signal, eliminating manual hardware configuration and software secondary configuration, improving the usability of the product, reducing the problem of the entire system not being able to work normally due to improper use, and greatly improving the ease of operation and overall stability.

[0149] In order to implement the above embodiment, the embodiment of the present application also proposes an air conditioner.

[0150] See also Figure 5 The air conditioner proposed in the embodiment of the present application may specifically include: Figure 4 Controller shown.

[0151] The air conditioner of the embodiment of the present application can automatically identify the signal type of the input signal, and control the on and off of the switching device group through the main control unit to configure the signal adoption mode corresponding to the signal type of the input signal, so that the signal type of the connected sensor matches the signal adoption mode of the input control circuit, thereby realizing automatic matching of the input signal, eliminating manual hardware configuration and software secondary configuration, improving the usability of the product, reducing the problem of the entire system not being able to work normally due to improper use, and greatly improving the ease of operation and overall stability.

[0152] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An input control circuit, characterized in that: include: An input terminal, connected to sensors of different signal types, for receiving input signals emitted by the sensors of different signal types; a switch device group connected to the input end; The main control unit is connected to the switching device group and is used to identify the signal type of the input signal connected to the input end, and control the on-off switching of each switching device in the switching device group according to the signal type of the input signal to achieve different signal sampling modes.

2. The input control circuit according to claim 1, wherein: The main control unit is configured to identify the signal type of the input signal received by the input terminal, including: Obtaining a voltage value at a sampling channel end of the main control unit, and if the voltage value is greater than or equal to a first voltage threshold, identifying the signal type of the input signal connected to the input end as a current signal; or If the voltage value is less than a first voltage threshold and greater than a second voltage threshold, identifying the signal type of the input signal connected to the input terminal as a voltage signal, wherein the first voltage threshold is greater than the second voltage threshold; or If the voltage value is less than the first voltage threshold and less than or equal to the second voltage threshold, obtaining the resistance value of the sampling channel end; if the resistance value is greater than or equal to the first resistance threshold, identifying the signal type of the input signal connected to the input end as a digital input signal in a disconnected state; or If the resistance value is less than a first resistance threshold, less than or equal to a second resistance threshold, and greater than or equal to a third resistance threshold, then identifying the signal type of the input signal connected to the input terminal as a resistance signal, wherein the first resistance threshold is greater than the second resistance threshold, and the second resistance threshold is greater than the third resistance threshold; or If the resistance value is less than the third resistance threshold, or the resistance value is greater than the second resistance threshold and less than the first resistance threshold, it is identified that the signal type of the input signal connected to the input end is a digital input signal in a closed state.

3. The input control circuit according to claim 2, wherein: The main control unit is further used for: If the resistance value is greater than a fourth resistance threshold, identifying the resistance signal as a thermistor signal; or If the resistance value is less than or equal to a fourth resistance threshold, identifying the resistance signal as a platinum resistance thermometer signal; The fourth resistance threshold is greater than the third resistance threshold and less than the second resistance threshold.

4. The input control circuit according to claim 2, wherein: The main control unit is further configured to configure the sampling channel end to a signal sampling mode corresponding to the signal type according to the identified signal type of the input signal connected to the input end, and save the mode configuration parameters corresponding to the sampling channel end.

5. The input control circuit according to claim 1, wherein: The main control unit is configured to generate a first control signal and a second control signal according to a signal type of the input signal, and send the first control signal to the switching device group via a first control terminal of the main control unit, and send the second control signal to the switching device group via a second control terminal of the main control unit; The switching device group is used to switch on and off each switching device in the switching device group in response to the first control signal and the second control signal to achieve different signal sampling modes, and the signal sampling modes include voltage sampling mode, current sampling mode, resistance sampling mode and digital input mode.

6. The input control circuit according to claim 5, characterized in that: The input control circuit further includes: a first resistor, wherein a first end of the first resistor is connected to the input end, and a second end of the first resistor is connected to the sampling channel end of the main control unit; a second resistor, a first end of the second resistor being connected to a second end of the first resistor; a third resistor, a first end of the third resistor being connected to the input end; a fourth resistor, a first end of the fourth resistor being connected to the input end; The switching device group includes: a first switching device, wherein a first end of the first switching device is connected to a first DC voltage source, and a second end of the first switching device is connected to a second end of the third resistor; a second switch device, wherein a first end of the second switch device is connected to a third end of the first switch device, a second end of the second switch device is grounded, and a third end of the second switch device is connected to the first control end of the main control unit; a third switch device, wherein a first end of the third switch device is connected to the second end of the fourth resistor, a second end of the third switch device is grounded, and a third end of the third switch device is connected to the second control end of the main control unit; a fourth switching device, wherein a first terminal of the fourth switching device is connected to the second terminal of the second resistor, and a second terminal of the fourth switching device is grounded; A fifth switching device, wherein a first end of the fifth switching device is respectively connected to the third end of the fourth switching device and the second DC voltage source, a second end of the fifth switching device is grounded, and a third end of the fifth switching device is connected to the second control end of the main control unit.

7. The input control circuit according to claim 6, wherein: The main control unit is configured to generate a first control signal with a signal value of 0 and a second control signal with a signal value of 0 according to the voltage signal when the main control unit identifies that the signal type of the input signal connected to the input end is a voltage signal; The switching device group is configured to form a voltage sampling circuit in response to the first control signal and the second control signal by respectively controlling the first switching device, the second switching device, the third switching device, and the fifth switching device to be disconnected, and controlling the fourth switching device to be connected, thereby realizing the voltage sampling mode; The voltage sampling circuit is used to sample the target voltage signal in the voltage sampling mode.

8. The input control circuit according to claim 6, wherein: The main control unit is configured to generate a first control signal with a signal value of 0 and a second control signal with a signal value of 1 according to the current signal when the main control unit identifies that the signal type of the input signal connected to the input end is a current signal; The switching device group is configured to form a current sampling circuit in response to the first control signal and the second control signal by respectively controlling the first switching device, the second switching device, and the fourth switching device to be disconnected, and respectively controlling the third switching device and the fifth switching device to be connected, thereby realizing the current sampling mode; The current sampling circuit is used to sample the target current signal in the current sampling mode.

9. The input control circuit according to claim 6, wherein: The main control unit is configured to generate a first control signal with a signal value of 1 and a second control signal with a signal value of 0 according to the resistance signal when the main control unit identifies that the signal type of the input signal connected to the input end is a resistance signal; the switching device group is configured to form a resistance sampling circuit in response to the first control signal and the second control signal by controlling the first switching device, the second switching device, and the fourth switching device to be turned on, and controlling the third switching device and the fifth switching device to be turned off, thereby realizing the resistance sampling mode; The resistance sampling circuit is used to measure the resistance value of the target resistance signal in the resistance sampling mode.

10. The input control circuit according to claim 6, wherein: The main control unit is configured to generate a first control signal with a signal value of 1 and a second control signal with a signal value of 0 according to the digital input signal when the main control unit identifies that the signal type of the input signal connected to the input end is a digital input signal; The switching device group is configured to form a digital input circuit in response to the first control signal and the second control signal by controlling the first switching device, the second switching device, and the fourth switching device to be turned on, and controlling the third switching device and the fifth switching device to be turned off, thereby realizing the digital input mode. The digital input circuit is used to read the digital input signal in the digital input mode.

11. The input control circuit according to any one of claims 1 to 10, characterized in that: The input control circuit further includes: A first circuit protection device is provided, wherein a first terminal of the first circuit protection device is connected to the input terminal, and a second terminal of the first circuit protection device is grounded.

12. The input control circuit according to any one of claims 2-4, 6-10, characterized in that: The input control circuit further includes: A second circuit protection device, wherein a first terminal of the second circuit protection device is connected to a third DC voltage source, a second terminal of the second circuit protection device is connected to the sampling channel terminal, and a third terminal of the second circuit protection device is grounded.

13. The input control circuit according to any one of claims 2-4, 6-10, characterized in that: The input control circuit further includes: A filtering device, the filtering device comprising a first capacitor, a second capacitor and a fifth resistor, wherein the first end of the first capacitor is respectively connected to the second end of the first resistor and the first end of the fifth resistor, the second end of the first capacitor is grounded, the first end of the second capacitor is respectively connected to the sampling channel end and the second ends of the five resistors, and the second end of the second capacitor is grounded.

14. A controller, characterized in that: The method comprises the input control circuit according to any one of claims 1 to 13.

15. An air conditioner, characterized in that: Comprising the controller of claim 14.

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