Electric auxiliary heating assembly detection circuit, testing apparatus, electric auxiliary heating system, and air conditioner

Abstract

An electric auxiliary heating assembly detection circuit, a testing apparatus, an electric auxiliary heating system, and an air conditioner. The electric auxiliary heating assembly detection circuit comprises an alternating current power supply output end (10), a current sampling circuit (20), and a state detection circuit (30). The alternating current power supply output end (10) is configured to be connected to a test power supply and an electric auxiliary heating assembly to be tested, so as to output to said electric auxiliary heating assembly a low-voltage alternating current outputted by the test power supply; a sampling end of the current sampling circuit (20) is electrically connected to the alternating current power supply output end (10), and the current sampling circuit (20) is configured to collect a current flowing through said electric auxiliary heating assembly, and output a current sampling signal; and the state detection circuit (30) is electrically connected to an output end of the current sampling circuit (20), and is configured to receive calibrated power of said electric auxiliary heating assembly and cold state resistance values of heating wires by reading an identification code when said electric auxiliary heating assembly is connected, and detect the connection state of said electric auxiliary heating assembly on the basis of the calibrated power, the cold state resistance values of the heating wires, and the current sampling signal.

Description

Electric auxiliary heating component testing circuit, testing device, electric auxiliary heating system and air conditioner

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202422699124.5, filed on November 5, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of testing technology, and in particular to a testing circuit, testing device, electric auxiliary heating system and air conditioner for an electric auxiliary heating component. Background Technology

[0004] With the development of air conditioning technology, many air conditioning products have added electric auxiliary heating functions to their heat pump systems to improve product applicability and user experience, providing additional heating capacity under extreme weather conditions. Therefore, electric auxiliary heating components have become an indispensable part of modern air conditioning products. However, traditional testing methods for electric auxiliary heating components have many shortcomings in the factory testing process. Currently, electric auxiliary heating components typically come in various power specifications, such as 3KW, 5KW, 8KW, and 10KW, to meet the needs of different users. To ensure product quality, comprehensive functional testing of the electric auxiliary heating components is required before leaving the factory. Related testing schemes usually require inserting multiple probes to test the function of each group of electric heating elements individually, which complicates the testing process and is time-consuming, significantly impacting production efficiency. Summary of the Invention

[0005] The main objective of this application is to provide an electric auxiliary heating component testing circuit, testing device, electric auxiliary heating system, and air conditioner, aiming to reduce the complexity of testing electric auxiliary heating components, improve testing efficiency, and thus improve production efficiency.

[0006] To achieve the above objectives, this application proposes an electric auxiliary heating component detection circuit. The electric auxiliary heating component is provided with an identification code that identifies information about the component. The electric auxiliary heating component includes a heating wire, and the information includes the rated power of the component and the cold resistance value of the heating wire. The electric auxiliary heating component detection circuit includes:

[0007] The AC power output terminal is used to connect the test power supply and the electric auxiliary heating component under test, so as to output the low-voltage AC power output by the test power supply to the electric auxiliary heating component under test.

[0008] A current sampling circuit, wherein the sampling terminal of the current sampling circuit is electrically connected to the output terminal of the AC power supply;

[0009] The current sampling circuit is used to collect the current flowing through the electric auxiliary heating component under test and output the corresponding current sampling signal.

[0010] A state detection circuit is electrically connected to the output terminal of the current sampling circuit; the state detection circuit is used to receive the rated power of the electric auxiliary heating component under test and the cold resistance value of the heating wire by reading the identification code when the electric auxiliary heating component under test is connected; and,

[0011] The connection status of the electric auxiliary heating component under test is detected based on the rated power, the cold resistance value of the heating wire, and the current sampling signal.

[0012] In some embodiments, the state detection circuit includes:

[0013] The identification code reading circuit is used to read the identification code and output the corresponding reading signal when an electric auxiliary heating component to be tested is connected.

[0014] The main control circuit is electrically connected to the identification code reading circuit. The main control circuit is used to receive the reading signal and to receive the rated power of the electric auxiliary heating component under test and the cold resistance value of the heating wire according to the reading signal; and to detect the connection status of the electric auxiliary heating component under test according to the rated power, the cold resistance value of the heating wire and the current sampling signal.

[0015] In some embodiments, the main control circuit includes:

[0016] The first multiplier, the first terminal of the first multiplier is electrically connected to the output terminal of the current sampling circuit;

[0017] The microprocessor is electrically connected to the second terminal of the first multiplier and is used to output the received cold resistance value of the electric auxiliary heating component under test to the first multiplier, so that the first multiplier multiplies the current value of the current sampling signal connected to its first terminal and the cold resistance value connected to its second terminal and outputs a voltage signal.

[0018] The second multiplier has its first terminal electrically connected to the output terminal of the first multiplier, and its second terminal electrically connected to the output terminal of the current sampling circuit. The second multiplier is used to multiply the current value of the current sampling signal connected to its first terminal and the voltage signal to output a power signal.

[0019] The comparator has its input terminal electrically connected to the output terminal of the second multiplier, and its reference terminal electrically connected to the microprocessor.

[0020] The microprocessor is used to output the received calibration power of the electric auxiliary heating component under test to the reference terminal, so as to control the comparator to compare the power of the power signal with the calibration power and output the corresponding comparison result to the microprocessor to detect the connection status of the electric auxiliary heating component under test.

[0021] In some embodiments, the electric auxiliary heating component detection circuit further includes:

[0022] A prompting circuit is electrically connected to the status detection circuit;

[0023] The status detection circuit is used to control the prompting circuit to work / stop working based on the detected connection status of the electric auxiliary heating component under test.

[0024] In some embodiments, the current sampling circuit includes:

[0025] A current sensor is electrically connected to the output terminal of the AC power supply, and the output terminal of the current sensor is electrically connected to the state detection circuit.

[0026] The current sensor is used to collect the current flowing through the electric auxiliary heating component under test and output the corresponding AC current sampling signal to the status detection circuit.

[0027] In some embodiments, the current sensor includes one or more combinations of a current transformer, a Hall effect sensor, and a shunt.

[0028] In some embodiments, the current sampling circuit further includes:

[0029] A rectifier circuit, the input terminal of which is electrically connected to the current sensor, is used to rectify the AC current sampling signal output by the current sensor and output a corresponding rectified signal.

[0030] A filtering circuit, wherein the input terminal of the filtering circuit is electrically connected to the output terminal of the rectifier circuit, and the filtering circuit is used to filter the rectified signal and output a corresponding filtered signal.

[0031] A voltage divider circuit, wherein the first terminal of the voltage divider circuit is electrically connected to the output terminal of the filter circuit, and the second terminal of the voltage divider circuit is electrically connected to the state detection circuit;

[0032] The voltage divider circuit is used to divide the filtered signal according to a preset voltage division ratio and then output it to the state detection circuit.

[0033] In some embodiments, the voltage divider circuit includes:

[0034] First voltage divider resistor;

[0035] The second voltage divider resistor is connected to the first terminal of the first voltage divider resistor, the first terminal of the second voltage divider resistor, and the output terminal of the filter circuit. The second terminal of the first voltage divider resistor is grounded, and the second terminal of the second voltage divider resistor is electrically connected to the state detection circuit.

[0036] In some embodiments, the AC power output terminal includes a positive terminal and a negative terminal, the number of heating wires is two, and the electric auxiliary heating component detection circuit further includes:

[0037] Two probe assemblies, wherein the positive terminal is electrically connected to the first end of one of the probe assemblies, and the negative terminal is electrically connected to the first end of the other probe assembly.

[0038] This application also proposes a testing device, which includes the electric auxiliary heating component detection circuit described in any one of the above claims.

[0039] This application also proposes an electric auxiliary heating system, which includes a test power supply, an electric auxiliary heating component, and the aforementioned electric auxiliary heating component detection circuit. The test power supply is connected to the electric auxiliary heating component through the AC power output terminal of the electric auxiliary heating component detection circuit.

[0040] This application also proposes an air conditioner, which includes the electric auxiliary heating component detection circuit described in any one of the above claims;

[0041] And / or, the electric auxiliary heating system described above. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0043] Figure 1 is a schematic diagram of a module of an embodiment of the electric auxiliary heating component detection circuit of this application;

[0044] Figure 2 is a schematic diagram of another embodiment of the detection circuit for the electric auxiliary heating component of this application;

[0045] Figure 3 is a schematic diagram of a module of another embodiment of the electric auxiliary heating component detection circuit of this application;

[0046] Figure 4 is a schematic diagram of a module of another embodiment of the electric auxiliary heating component detection circuit of this application;

[0047] Figure 5 is a schematic diagram of another embodiment of the detection circuit for the electric auxiliary heating component of this application;

[0048] Figure 6 is a circuit diagram of an embodiment of the electric auxiliary heating system of the relevant scheme;

[0049] Figure 7 is a circuit diagram of an embodiment of the electric auxiliary heating system of this application.

[0050] Explanation of reference numerals: 10. AC power output terminal; 20. Current sampling circuit; 30. Status detection circuit; 40. Indication circuit; 21. Current sensor; 22. Rectifier circuit; 23. Filter circuit; 24. Voltage divider circuit; 31. Identifier code reading circuit; 32. Main control circuit; 33. Microprocessor; 34. First multiplier; 35. Second multiplier; 36. Comparator.

[0051] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0053] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0054] With the development of air conditioning technology, many air conditioning products have added electric auxiliary heating functions to their heat pump systems to improve product applicability and user experience. This provides additional heating capacity under extreme weather conditions, such as in cold regions. For example, electric auxiliary heating is often added to assist heating, allowing for emergency heating even if the outdoor unit shuts down due to other issues. Therefore, electric auxiliary heating components have become an indispensable part of modern air conditioning products. Electric auxiliary heating components can be sold independently as an optional accessory. To ensure product quality, functional tests are conducted before shipment. However, traditional testing methods for electric auxiliary heating components have many shortcomings. Currently, electric auxiliary heating components typically come in various power specifications, such as 3KW, 5KW, 8KW, and 10KW, to meet the needs of different users. Under safe production line testing conditions, relevant testing schemes usually require inserting multiple detection probes to test whether each electric heating element functions properly. Because the factory's electric auxiliary heating test cannot use high voltage, each group of electric heating components must be tested individually, requiring multiple probes for testing. Furthermore, the testing process is complex, which complicates the process as it flows through the production line. The process of placing the probes is also time-consuming, greatly affecting production efficiency.

[0055] Referring to Figure 6, the relevant detection technology requires six probes, which are respectively attached to the air switch inlet, two sets of electric heating wire temperature controllers, and the fuse. When there is an auxiliary heating control signal, the coils of relays 1 and 2 are energized, and the contacts of relays 1 and 2 close. By detecting the current on both sides of the heating wire and displaying it through indicator lights, it is possible to determine whether there are any unconnected or incorrectly connected wires in the electric heating circuit, thus achieving electric auxiliary heating detection. However, attaching six probes during product flow significantly reduces production efficiency.

[0056] Therefore, referring to Figure 1, this application proposes an electric auxiliary heating component detection circuit. The electric auxiliary heating component is provided with an identification code that identifies information about the component. The electric auxiliary heating component includes a heating wire, and the information includes the rated power of the component and the cold resistance value of the heating wire. The electric auxiliary heating component detection circuit includes:

[0057] AC power output terminal 10 is used to connect the test power supply and the electric auxiliary heating component under test, so as to output the low-voltage AC power output by the test power supply to the electric auxiliary heating component under test.

[0058] A current sampling circuit 20, wherein the sampling terminal of the current sampling circuit 20 is electrically connected to the AC power output terminal 10;

[0059] The current sampling circuit 20 is used to collect the current flowing through the electric auxiliary heating component under test and output the corresponding current sampling signal.

[0060] The state detection circuit 30 is electrically connected to the output terminal of the current sampling circuit 20; the state detection circuit 30 is used to receive the rated power of the electric auxiliary heating component under test and the cold resistance value of the heating wire by reading the identification code when the electric auxiliary heating component under test is connected; and,

[0061] The connection status of the electric auxiliary heating component under test is detected based on the rated power, the cold resistance value of the heating wire, and the current sampling signal.

[0062] In this embodiment, the current sampling circuit 20 can be implemented using a current sensor 21, a shunt, etc. The state detection circuit 30 can be implemented using a main controller, such as an MCU, DSP (Digital Signal Processor), FPGA (Field Programmable Gate Array), PLC, or SOC (System-on-Chip). The main controller can integrate a card reader module, an AD conversion module, etc., for reading the identification code on the electric auxiliary heating component. The identification code can include barcodes, QR codes, dot matrix codes, etc. The identification code is used to store information about the electric auxiliary heating component, including but not limited to the rated power and the cold resistance value of the heating wire.

[0063] It should be noted that for safety reasons, high-voltage electricity cannot be used when testing electric auxiliary heating components in the factory. High-voltage electricity refers to high-voltage power supplies, such as 220V or 380V AC, as these voltage levels may pose safety hazards when used directly for testing. A 24V power supply can provide sufficient current for functional testing without damaging the electric auxiliary heating component. The cold resistance of the heating wire remains constant at 24V. Therefore, in this embodiment, a 24V AC test power supply can be used to output 24V low-voltage AC power to the electric auxiliary heating component under test, enabling accurate measurement of resistance and current, thereby determining the component's operating status.

[0064] In this embodiment, when a test electric auxiliary heating component is connected, the status detection circuit 30 reads the identification code on the electric auxiliary heating component to obtain the rated power and cold resistance value of the heating wire of the test electric auxiliary heating component. At the same time, it obtains the current value flowing through the test electric auxiliary heating component based on the current sampling signal output by the current sampling circuit 20. In this way, the status detection circuit 30 can determine the current input power of the test electric auxiliary heating component based on the current value and the cold resistance value, and compare it with the rated power to detect the connection status of the electric auxiliary heating component.

[0065] Specifically, the microcontroller (MCU) reads the identification code on the auxiliary heating component through the card reader module. This identification code contains the rated power of the auxiliary heating component and the cold resistance value of the heating wire. The AD conversion module converts the analog signal (current sampling signal) output by the current sampling circuit 20 into a digital signal and transmits it to the microcontroller (MCU). The microcontroller (MCU) calculates the actual input power of the auxiliary heating component based on the rated power, cold resistance value, and current sampling signal. If the actual power differs significantly from the rated power, or if the current sampling signal is abnormal (e.g., zero), it is determined that there is a connection fault in the auxiliary heating component. Referring to Figure 7, the auxiliary heating component under test includes two heating wires, heating wire 1 and heating wire 2. When an auxiliary heating control signal is input, the coils of relays K1 and K2 are energized, causing the relay contacts to close, thereby forming a closed loop and allowing current to flow through the two heating wires. At the start of testing, a low-voltage AC power supply is connected. The current sampling circuit 20 collects the current flowing through the auxiliary heating component. The microcontroller (MCU) reads the identification code of the auxiliary heating component through the card reader module to obtain the rated power and cold resistance value. The AD conversion module converts the current sampling signal into a digital signal and transmits it to the MCU. The MCU calculates the actual power based on the rated power, cold resistance value, and current sampling signal, and determines the wiring status of the auxiliary heating component. If the actual power is within the allowable error range (e.g., ±5%), the auxiliary heating component is considered to be connected normally. If the actual power deviates from the rated power, it is considered that there may be a problem with the wiring being disconnected or incorrectly connected. If the current sampling signal is zero, the auxiliary heating component is considered to be completely disconnected.

[0066] It is understandable that the technical parameters of electric auxiliary heating components include, but are not limited to, 3KW, 5KW, 8KW, and 10KW, with corresponding single-group cold-state resistance values ​​of 20Ω, 15Ω, 10Ω, and 5Ω, respectively. Since each power terminal consists of two heating wires, if a single power is measured, such as a 3KW unit, the resistance after two groups are connected in parallel is 10Ω. This is the same as the resistance of a single 8KW unit. Therefore, even if the electric auxiliary heating component under test malfunctions, it is impossible to determine whether the tested component's power is 3KW or 8KW. To differentiate between different power levels and ensure accurate identification and detection of electric auxiliary heating components of various power levels, this application's electric auxiliary heating component detection circuit not only measures resistance but also obtains the actual input power through current sampling and compares it with the calibrated power read by reading the identification code. This allows for more accurate identification of electric auxiliary heating components of different power levels.

[0067] In practical applications, the status detection circuit 30 can read the identification code on the auxiliary heating component under test when the AC power output terminal 10 outputs low-voltage AC power to the auxiliary heating component under test. This allows it to receive the rated power of the auxiliary heating component and the cold resistance value of the heating wire. Simultaneously, it receives the current sampling signal output by the current sampling circuit 20 and detects the connection status of the auxiliary heating component under test based on the rated power, the cold resistance value of the heating wire, and the current sampling signal. For example, the current input power is obtained based on the cold resistance value and the current sampling signal, and then compared with the rated power to detect the connection status of the auxiliary heating component under test. Compared with related solutions, this eliminates the need for multiple detection probes, reducing the complexity of testing auxiliary heating components. It also effectively distinguishes auxiliary heating components of different power levels, improving testing accuracy and ultimately increasing production efficiency.

[0068] Referring to FIG2, in some embodiments, the state detection circuit 30 includes:

[0069] The identification code reading circuit 31 is used to read the identification code and output the corresponding reading signal when a test electric auxiliary heating component is connected.

[0070] The main control circuit 32 is electrically connected to the identification code reading circuit 31. The main control circuit 32 is used to receive the reading signal and to receive the rated power of the electric auxiliary heating component under test and the cold resistance value of the heating wire according to the reading signal; and to detect the connection status of the electric auxiliary heating component under test according to the rated power, the cold resistance value of the heating wire and the current sampling signal.

[0071] In this embodiment, the identification code reading circuit 31 can be a barcode / QR code reading module, an RFID card reader module, an NFC card reader module, or a dedicated reading chip, etc. In practical applications, the corresponding identification code reading circuit 31 can be selected according to the type of identification code. The main control circuit 32 can be implemented using the aforementioned main controller.

[0072] Referring to Figure 3, the main control circuit 32 includes:

[0073] The first multiplier 34, the first terminal of the first multiplier 34 is electrically connected to the output terminal of the current sampling circuit 20;

[0074] Microprocessor 33 is electrically connected to the second terminal of the first multiplier 34 and is used to output the received cold resistance value of the electric auxiliary heating component under test to the first multiplier 34, so that the first multiplier 34 multiplies the current value of the current sampling signal connected to its first terminal and the cold resistance value connected to its second terminal and outputs a voltage signal.

[0075] The second multiplier 35 has its first terminal electrically connected to the output terminal of the first multiplier 34, and its second terminal electrically connected to the output terminal of the current sampling circuit 20. The second multiplier 35 is used to multiply the current value of the current sampling signal connected to its first terminal and the voltage signal to output a power signal.

[0076] Comparator 36, the input terminal of which is electrically connected to the output terminal of the second multiplier 35, and the reference terminal of which is electrically connected to the microprocessor 33;

[0077] The microprocessor 33 is used to output the received calibration power of the electric auxiliary heating component under test to the reference terminal, so as to control the comparator 36 to compare the power of the power signal with the calibration power and output the corresponding comparison result to the microprocessor 33 to detect the connection status of the electric auxiliary heating component under test.

[0078] In this embodiment, the first multiplier 34 and the second multiplier 35 can both be implemented using multiplier chips, the comparator 36 can be implemented using a comparator 36 chip, and the microprocessor 33 can be implemented using the aforementioned main controller. The microprocessor 33 can integrate a memory to store the calibrated power of the electric auxiliary heating component under test and the cold resistance value of the heating wire corresponding to the received read signal. The microprocessor 33 is also used to output the current cold resistance value of the electric auxiliary heating component under test to the second terminal of the first multiplier 34, and to output the corresponding calibrated power to the reference terminal of the comparator 36. The first multiplier 34 multiplies the current value of the current sampling signal with the cold resistance value and outputs the corresponding voltage signal to the second multiplier 35. The second multiplier 35 then multiplies the voltage signal with the current value of the current sampling signal and outputs the corresponding power signal to the input of the comparator 36. The comparator 36 compares the input power corresponding to the power signal connected to its own input with the calibrated power and outputs it to the microprocessor 33. The microprocessor 33 can detect the connection status of the electric auxiliary heating component under test based on the result output by the comparator 36. The connection status includes normal connection status and fault status. The fault status includes disconnection or incorrect connection.

[0079] To detect electric auxiliary heating components of different power ratings, a detection circuit consisting of a first multiplier 34, a second multiplier 35, and a comparator 36 can be designed. Each circuit is specifically designed to detect an electric auxiliary heating component of a particular power rating. That is, each multiplier and comparator 36 circuit corresponds to a specific power level. Based on the parsed identification code information, the corresponding circuit is selected for detection. For example, the microprocessor 33 in the status detection circuit 30 can determine the power rating of the electric auxiliary heating component under test based on the received calibrated power, and then select the corresponding detection circuit (e.g., 3KW, 5KW, 8KW, 10KW). Specifically, the first multiplier 34 in the selected detection circuit multiplies the current value of the current sampling signal with the cold resistance value, outputting a voltage signal. The second multiplier 35 multiplies the voltage signal output by the first multiplier 34 with the current value of the current sampling signal, outputting a power signal. Comparator 36 compares the power signal output from the second multiplier 35 with the calibrated power and outputs the comparison result to determine whether the electric auxiliary heating component is properly connected. Unselected detection circuits can remain in a non-operating state, without signal processing, to reduce power consumption.

[0080] It should be noted that the electric auxiliary heating component detection circuit of this application can be applied to a test device for testing the electric auxiliary heating component under test. Before the test begins, it is necessary to ensure that the test power supply switch is turned on to connect to a low-voltage AC power supply (such as 24V AC). When the electric auxiliary heating component is connected to the test device, the identification code reading circuit 31 reads the identification code on the electric auxiliary heating component and outputs the corresponding reading signal. Optionally, it can be manually determined whether the electric auxiliary heating component under test is connected, or the current sampling signal output by the current detection circuit can determine whether the electric auxiliary heating component under test is connected. For example, when current is detected, it indicates that the electric auxiliary heating component has been connected. Alternatively, a photoelectric sensor can be set in the test circuit. When the electric auxiliary heating component is connected to the test circuit of the test device, it blocks or reflects light, and the sensor emits a signal. If the photoelectric sensor does not detect a change in light, it indicates that the electric auxiliary heating component is not connected.

[0081] In this embodiment, the identification code reading circuit 31 can be connected to a scanner. The scanner acquires the identification code of the electric auxiliary heating component under test and outputs it to the identification code reading circuit 31. The identification code reading circuit 31 can identify the identification code scanned by the scanner to determine the rated power and the cold resistance value of the heating wire. Optionally, the scanner can be fixedly installed at the entrance of the testing device or near the connection position of the electric auxiliary heating component under test. When the electric auxiliary heating component is connected to the testing device, the scanner is triggered to start reading the identification code. Optionally, the scanner can also be mounted on a sliding or rotating mechanism. When the electric auxiliary heating component is connected to the testing device, the scanner automatically slides or rotates to the location of the identification code for reading. In this embodiment, when the scanner is installed on the testing device, it can also be equipped with a proximity sensor or an infrared sensor. When the electric auxiliary heating component approaches or is connected to the testing device, the sensor triggers the scanner to start reading the identification code.

[0082] Specifically, the identification code read by the scanner is transmitted to the identification code reading circuit 31 via a UART, SPI, or I2C interface. The identification code reading circuit 31 receives and outputs the code to the microprocessor 33. The microprocessor 33 receives the reading signal, parses the identification code, obtains the rated power of the electric auxiliary heating component and the cold resistance value of the heating wire, and stores them in its memory. Simultaneously, the current sampling circuit 20 collects the current flowing through the electric auxiliary heating component, converts it into a digital signal via an AD conversion module, and transmits it to the microprocessor 33. After signal processing, the signal is output to the first terminal of the first multiplier 34. The microprocessor 33 outputs the cold resistance value to the second terminal of the first multiplier 34. The first multiplier 34 multiplies the current value of the current sampling signal with the cold resistance value and outputs a voltage signal. The second multiplier 35 multiplies the voltage signal output by the first multiplier 34 with the current value of the current sampling signal and outputs a power signal. The comparator 36 compares the power signal output by the second multiplier 35 with the rated power connected to the reference terminal and outputs the comparison result to the microprocessor 33. Based on the comparison results, the microprocessor 33 determines whether the electric auxiliary heating component is properly connected.

[0083] Optionally, referring to FIG4, in some embodiments, the electric auxiliary heating component detection circuit further includes:

[0084] The prompting circuit 40 is electrically connected to the status detection circuit 30;

[0085] The status detection circuit 30 is used to control the prompting circuit 40 to work / stop working based on the detected connection status of the electric auxiliary heating component under test.

[0086] In this embodiment, the prompting circuit 40 can be implemented using an indicator light, buzzer, etc., to provide sound or light prompts based on the results of the status detection circuit 30. In this embodiment, an indicator light is used as an example; an LED driver module can be used to drive the working status of the LED indicator light. Optionally, when the status detection circuit 30 detects that the auxiliary heating component is connected normally, the LED driver module drives the indicator light to light up green. When the status detection circuit 30 detects a connection fault in the auxiliary heating component, the LED driver module drives the indicator light to light up red. Optionally, when the status detection circuit 30 detects that the auxiliary heating component is connected normally, the LED driver module drives the indicator light to light up. When the status detection circuit 30 detects a connection fault in the auxiliary heating component, the LED driver module will not output a drive signal to the indicator light, and the indicator light will not work (will not light up).

[0087] The above settings effectively detect the connection status of electric auxiliary heating components at different power levels, promptly identify connection faults, and alert operators via the prompting circuit 40. This automated detection and real-time feedback mechanism improves detection efficiency and reliability, thereby increasing production efficiency.

[0088] Referring to Figure 5, in some embodiments, the current sampling circuit 20 includes:

[0089] A current sensor 21 is electrically connected to the AC power output terminal 10, and the output terminal of the current sensor 21 is electrically connected to the state detection circuit 30.

[0090] The current sensor 21 is used to collect the current flowing through the electric auxiliary heating component under test and output the corresponding AC current sampling signal to the state detection circuit 30.

[0091] The current sampling circuit 20 further includes:

[0092] The rectifier circuit 22 is electrically connected to the current sensor 21. The rectifier circuit 22 is used to rectify the AC current sampling signal output by the current sensor 21 and output the corresponding rectified signal.

[0093] The filter circuit 23 is electrically connected to the output terminal of the rectifier circuit 22. The filter circuit 23 is used to filter the rectified signal and output a corresponding filtered signal.

[0094] Voltage divider circuit 24, the first end of which is electrically connected to the output end of filter circuit 23, and the second end of voltage divider circuit 24 is electrically connected to state detection circuit 30;

[0095] The voltage divider circuit 24 is used to divide the filtered signal according to a preset voltage division ratio and then output it to the state detection circuit 30.

[0096] In this embodiment, the current sensor 21 includes one or more combinations of a current transformer, a Hall effect sensor, and a shunt. The rectifier circuit 22 can be implemented using diodes, and the filter circuit 23 can be implemented using any one or more combinations of resistors and capacitors. The voltage divider circuit 24 can be implemented using a voltage divider circuit composed of two resistors, which divides the filtered DC signal according to a pre-defined voltage division ratio to adjust the signal amplitude. The preset voltage division ratio is set in advance by the researchers and is adjusted by changing the resistance values ​​of the two resistors.

[0097] The voltage divider circuit 24 includes:

[0098] First voltage divider resistor;

[0099] The second voltage divider resistor is connected to the first terminal of the first voltage divider resistor, the first terminal of the second voltage divider resistor, and the output terminal of the filter circuit 23. The second terminal of the first voltage divider resistor is grounded, and the second terminal of the second voltage divider resistor is electrically connected to the state detection circuit 30.

[0100] Referring to Figure 7, CT is a current transformer, D1 is a rectifier diode, C is a filter capacitor, R1 is the first voltage divider resistor, R2 is the second voltage divider resistor, and IC is the main control circuit 32 (main control chip). The system containing the electric auxiliary heating assembly typically also has an air switch, usually installed in a distribution box or control cabinet outside the electric auxiliary heating assembly, to protect the entire circuit. When an overload or short circuit is detected, the air switch will automatically trip, cutting off the power supply. A fuse can also be used in conjunction with the air switch to provide additional short-circuit protection. The controller in the control cabinet outputs electric auxiliary heating control signals to control the opening / closing of relays K1 and K2, thereby controlling the power supply to the heating wire.

[0101] In this embodiment, the AC power output terminal 10 includes a positive terminal and a negative terminal, the number of heating wires is two, and the electric auxiliary heating component detection circuit further includes:

[0102] Two probe assemblies are provided, with the positive terminal electrically connected to the first end of one probe assembly and the negative terminal electrically connected to the first end of the other probe assembly. Specifically, two probes (probe 1 and probe 2) can be attached to the power supply position of the air switch to simulate a power supply. Under normal operating conditions, the electric auxiliary heating assembly obtains power from the grid, typically 220V or 380V AC. However, direct use of high-voltage electricity during functional testing on the production line poses a safety hazard; therefore, low-voltage (e.g., 24V) is used instead. By connecting the probes to the air switch position, the actual power access point can be simulated; that is, when the probes are connected to the air switch, it effectively simulates a power line connection, allowing the controller to control whether current flows through the electric auxiliary heating assembly.

[0103] In accordance with the above embodiments, when the electric auxiliary heating component is connected to the electric auxiliary heating component detection circuit, the scanner scans the auxiliary heating barcode and outputs it to the identification code reading circuit 31. The identification code reading circuit 31 processes and converts the barcode and outputs a corresponding reading signal to the main control circuit 32 to ensure the accuracy and reliability of the data. The main control circuit 32 receives the reading signal output by the identification code reading circuit 31 to obtain the power segment information of the corresponding model (including but not limited to the rated power and the cold resistance value of the heating wire) and inputs it to the IC. When the IC1 detects and identifies the auxiliary heating component information, it outputs a corresponding start control signal to the controller in the control cabinet. The controller starts the auxiliary heating control signal and controls relays K1 and K2 to engage. The current transformer collects the AC current flowing through the electric auxiliary heating component under test and outputs a corresponding AC current sampling signal. Diode D1 converts the AC current sampling signal into a rectified DC signal. Filter capacitor C filters out the AC component in the rectified signal and outputs a smooth DC signal. The voltage divider circuit 24, composed of resistors R1 and R2, divides the filtered DC signal according to a preset voltage division ratio, outputs an adjusted signal, and transmits it to the main control circuit 32IC for further processing. For example, the IC integrates an analog-to-digital converter to convert the divided signal into a digital signal before outputting it, enabling the main control circuit 32 to determine the current value flowing through the electric auxiliary heating component under test. Thus, the main control circuit 32IC can calculate the input power using the multiplier and compare it with the rated power using a comparator circuit to determine whether the electric auxiliary heating component under test is energized normally. When the difference between the input power and the rated power is within the allowable error range, the IC drives the indicator light to illuminate, indicating a normal signal. When the difference between the input power and the rated power is outside the allowable error range, the indicator light does not illuminate.

[0104] In practical applications, current sampling and processing of the electric auxiliary heating component are implemented, and combined with the prompting circuit 40, the working status of the electric auxiliary heating component is accurately detected. Furthermore, compared to related solutions that require six probes, this application only requires two probes installed at the air switch inlet to simulate power supply, connecting to a 24V AC test power supply. This simplifies the operation process, improves production efficiency, and ensures reliable product delivery. It not only improves the accuracy and reliability of the detection but also enhances the system's safety.

[0105] This application also proposes a testing device, which includes the electric auxiliary heating component detection circuit described in any of the above claims.

[0106] It is worth noting that since the testing device of this application is based on the above-mentioned electric auxiliary heating component detection circuit, the embodiments of the testing device of this application include all the technical solutions of all the embodiments of the above-mentioned electric auxiliary heating component detection circuit, and the technical effects achieved are exactly the same, so they will not be repeated here.

[0107] This application also proposes an electric auxiliary heating system, which includes a test power supply, an electric auxiliary heating component, and a detection circuit for the electric auxiliary heating component as described in any of the above claims. The test power supply is connected to the electric auxiliary heating component through the AC power output terminal 10 of the detection circuit for the electric auxiliary heating component.

[0108] In this embodiment, the power supply for testing can be a frequency converter, programmable AC power supply, etc. The type of power supply can be selected according to actual needs. The power supply must ensure a stable 24V AC power supply with a frequency that meets the testing requirements. A suitable power supply can be selected based on the power requirements of the auxiliary heating component under test, taking into account safety features such as electrical isolation and overload protection. If mobile testing is required, a small and lightweight power supply can be selected.

[0109] It is worth noting that since the electric auxiliary heating system of this application is based on the above-mentioned electric auxiliary heating component detection circuit, the embodiments of the electric auxiliary heating system of this application include all the technical solutions of all the embodiments of the above-mentioned electric auxiliary heating component detection circuit, and the technical effects achieved are exactly the same, so they will not be repeated here.

[0110] This application also proposes an air conditioner, which includes the electric auxiliary heating component detection circuit described in any of the above claims, and / or the electric auxiliary heating system described above.

[0111] In this embodiment, the electric auxiliary heating component detection circuit can be applied to an air conditioner, for example, as part of the air conditioner's self-test system. During air conditioner use, it is used to detect the connection status of the electric auxiliary heating component.

[0112] Specifically, after the air conditioner is turned on, the self-test system starts, preparing to test the electric auxiliary heating component. The scanner reads the identification code on the electric auxiliary heating component and transmits it to the identification code reading circuit 31 via UART, SPI, or I2C interface, outputting the read signal to the main control circuit 32. The main control circuit 32 receives the rated power and cold resistance value of the electric auxiliary heating component based on the read signal. The current transformer collects the AC current flowing through the electric auxiliary heating component and outputs an AC current sampling signal. The rectifier circuit 22 converts the AC current sampling signal into a DC signal. The filter circuit 23 smooths the DC signal and removes ripple. The voltage divider circuit 24 divides the voltage according to a preset ratio and outputs the adjusted signal to the main control circuit 32. The main control circuit 32 can convert the divided analog signal into a digital signal using its internal AD conversion module, calculate the input power and compare it with the rated power to determine if the electric auxiliary heating component is working properly. If the difference between the input power and the rated power is within the allowable error range, the main control circuit 32 drives the LED indicator to light up green, indicating that both heating wires in the electric auxiliary heating component are working properly. If the difference is outside the allowable error range, the LED indicator will light up red or a buzzer will sound, indicating a fault. If a fault is detected, the user can be alerted to check and repair the unit via the display screen or an external terminal connected to the air conditioner.

[0113] It should be noted that the self-test system can record the test data of the electric auxiliary heating component detection circuit and store it in the memory of the main control circuit 32. This data can be transmitted to external devices (such as PCs or the cloud) via an interface for convenient subsequent analysis and management. Furthermore, the AC power output terminal 10 can be directly connected to 220V or 380V AC power from the power grid, but it is essential to ensure good electrical isolation of the circuit to prevent damage to the equipment from high voltage. For example, an isolation transformer can be used to provide electrical isolation, and appropriate overload and short-circuit protection devices, such as air switches and fuses, should be provided to prevent damage or fire caused by excessive current.

[0114] Regular self-inspection can help detect connection problems or performance degradation of the electric auxiliary heating components in advance, and also help users or maintenance personnel take measures in advance to carry out necessary maintenance or replace parts, thereby extending the service life of the air conditioner and improving the user experience.

[0115] It is worth noting that since the air conditioner of this application is based on the above-mentioned electric auxiliary heating component detection circuit and / or electric auxiliary heating system, the embodiments of the air conditioner of this application include all the technical solutions of all embodiments of the above-mentioned electric auxiliary heating component detection circuit and / or electric auxiliary heating system, and the technical effects achieved are exactly the same, which will not be repeated here.

[0116] The above description is merely an optional embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct or indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A detection circuit for an electric auxiliary heating component, wherein, The auxiliary electric heating assembly is equipped with an identification code that identifies its information. The auxiliary electric heating assembly includes a heating wire, and the information includes the rated power of the auxiliary electric heating assembly and the cold resistance value of the heating wire. The auxiliary electric heating assembly detection circuit includes: The AC power output terminal is used to connect the test power supply and the electric auxiliary heating component under test, so as to output the low-voltage AC power output by the test power supply to the electric auxiliary heating component under test. A current sampling circuit, wherein the sampling terminal of the current sampling circuit is electrically connected to the output terminal of the AC power supply; The current sampling circuit is used to collect the current flowing through the electric auxiliary heating component under test and output the corresponding current sampling signal. A state detection circuit is electrically connected to the output terminal of the current sampling circuit; the state detection circuit is used to receive the rated power of the electric auxiliary heating component under test and the cold resistance value of the heating wire by reading the identification code when the electric auxiliary heating component under test is connected; and, The connection status of the electric auxiliary heating component under test is detected based on the rated power, the cold resistance value of the heating wire, and the current sampling signal.

2. The electric auxiliary heating component detection circuit as described in claim 1, wherein, The state detection circuit includes: The identification code reading circuit is used to read the identification code and output the corresponding reading signal when an electric auxiliary heating component to be tested is connected. The main control circuit is electrically connected to the identification code reading circuit. The main control circuit is used to receive the reading signal and to receive the rated power of the electric auxiliary heating component under test and the cold resistance value of the heating wire according to the reading signal; and to detect the connection status of the electric auxiliary heating component under test according to the rated power, the cold resistance value of the heating wire and the current sampling signal.

3. The electric auxiliary heating component detection circuit as described in claim 1 or 2, wherein, The main control circuit includes: The first multiplier, the first terminal of the first multiplier is electrically connected to the output terminal of the current sampling circuit; The microprocessor is electrically connected to the second terminal of the first multiplier and is used to output the received cold resistance value of the electric auxiliary heating component under test to the first multiplier, so that the first multiplier multiplies the current value of the current sampling signal connected to its first terminal and the cold resistance value connected to its second terminal and outputs a voltage signal. The second multiplier has its first terminal electrically connected to the output terminal of the first multiplier, and its second terminal electrically connected to the output terminal of the current sampling circuit. The second multiplier is used to multiply the current value of the current sampling signal connected to its first terminal and the voltage signal to output a power signal. The comparator has its input terminal electrically connected to the output terminal of the second multiplier, and its reference terminal electrically connected to the microprocessor. The microprocessor is used to output the received calibration power of the electric auxiliary heating component under test to the reference terminal, so as to control the comparator to compare the power of the power signal with the calibration power and output the corresponding comparison result to the microprocessor to detect the connection status of the electric auxiliary heating component under test.

4. The electric auxiliary heating component detection circuit as described in any one of claims 1 to 3, wherein, The electric auxiliary heating component detection circuit also includes: A prompting circuit is electrically connected to the status detection circuit; The status detection circuit is used to control the prompting circuit to work / stop working based on the detected connection status of the electric auxiliary heating component under test.

5. The electric auxiliary heating component detection circuit as described in any one of claims 1 to 4, wherein, The current sampling circuit includes: A current sensor is electrically connected to the output terminal of the AC power supply, and the output terminal of the current sensor is electrically connected to the state detection circuit. The current sensor is used to collect the current flowing through the electric auxiliary heating component under test and output the corresponding AC current sampling signal to the status detection circuit.

6. The electric auxiliary heating component detection circuit as described in claim 5, wherein, The current sensor includes one or more combinations of current transformer, Hall effect sensor, and shunt.

7. The electric auxiliary heating component detection circuit as described in claim 5, wherein, The current sampling circuit also includes: A rectifier circuit, the input terminal of which is electrically connected to the current sensor, is used to rectify the AC current sampling signal output by the current sensor and output a corresponding rectified signal. A filtering circuit, wherein the input terminal of the filtering circuit is electrically connected to the output terminal of the rectifier circuit, and the filtering circuit is used to filter the rectified signal and output a corresponding filtered signal. A voltage divider circuit, wherein the first terminal of the voltage divider circuit is electrically connected to the output terminal of the filter circuit, and the second terminal of the voltage divider circuit is electrically connected to the state detection circuit; The voltage divider circuit is used to divide the filtered signal according to a preset voltage division ratio and then output it to the state detection circuit.

8. The electric auxiliary heating component detection circuit as described in claim 7, wherein, The voltage divider circuit includes: First voltage divider resistor; The second voltage divider resistor is connected to the first terminal of the first voltage divider resistor, the first terminal of the second voltage divider resistor, and the output terminal of the filter circuit. The second terminal of the first voltage divider resistor is grounded, and the second terminal of the second voltage divider resistor is electrically connected to the state detection circuit.

9. The detection circuit for the electric auxiliary heating component as described in claim 1 or 2, wherein, The AC power output terminal includes a positive terminal and a negative terminal; the number of heating wires is two; and the electric auxiliary heating component detection circuit further includes: Two probe assemblies, wherein the positive terminal is electrically connected to the first end of one of the probe assemblies, and the negative terminal is electrically connected to the first end of the other probe assembly.

10. A testing apparatus, wherein, The testing device includes an electric auxiliary heating component detection circuit as described in any one of claims 1 to 9.

11. An electric auxiliary heating system, wherein, The electric auxiliary heating system includes a test power supply, an electric auxiliary heating component, and an electric auxiliary heating component detection circuit as described in any one of claims 1 to 9. The test power supply is connected to the electric auxiliary heating component through the AC power output terminal of the electric auxiliary heating component detection circuit.

12. An air conditioner, wherein, The air conditioner includes an electric auxiliary heating component detection circuit as described in any one of claims 1 to 9; And / or, the electric auxiliary heating system as described in claim 11.

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