A compressor control system and an air conditioner with a wide temperature range

Abstract

This invention discloses a compressor control system and a wide-range temperature-regulating air conditioner. The control system includes a power supply, a compressor, a main board, and a first temperature sensor. The power supply generates an input voltage. A power voltage input circuit is provided between the compressor and the power supply. The main board is electrically connected to the power voltage input circuit and, during operation, controls the on / off state of the power voltage input circuit. The first temperature sensor detects the indoor temperature and is electrically connected to the main board, transmitting electrical signals to it. A first fixed resistor is also electrically connected to the first temperature sensor. This invention ensures that the main board can still control the power voltage input circuit even when the indoor temperature is below 0°C, allowing the compressor to operate normally when the indoor temperature is below 0°C. This provides a basis for converting ordinary air conditioners into air conditioners with refrigeration functions.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, specifically a compressor control system and an air conditioner with a wide temperature range. Background Technology

[0002] The principle of an air conditioner is that the compressor compresses the gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant, which is then sent to the outdoor unit's condenser to become a liquid refrigerant. The liquid refrigerant then enters the evaporator through a capillary tube, absorbs heat from the indoor air, and vaporizes into a gaseous refrigerant. The gaseous refrigerant then returns to the compressor to continue compression and the cycle continues to provide cooling.

[0003] An existing type of air conditioner, after modification, can achieve a freezing function, that is, it can lower the minimum cooling temperature to below zero degrees Celsius. However, if... Figure 1 As shown, existing air conditioners have a compressor electrically connected to a main board, which in turn is electrically connected to an indoor ambient temperature NTC (NTC is short for Negative Temperature Coefficient Thermistor). The indoor ambient temperature NTC transmits different resistance values ​​according to the detected changes in the indoor ambient temperature, automatically starting / stopping or adjusting the frequency based on the set operating state. In existing air conditioners, when the indoor ambient temperature NTC is below 15°C, its resistance increases, causing a low-level signal to be transmitted to the main board, controlling the compressor to stop working. In other words, the compressor does not work for cooling below 15°C, which fails to meet the need to modify a regular household air conditioner to achieve freezing functions in small, enclosed spaces. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the aforementioned technical problems in the related art. To this end, the present invention provides a compressor control system and a wide-range temperature-regulating air conditioner, enabling the compressor to operate normally when the indoor temperature is below 0°C, thus transforming an ordinary air conditioner into one with refrigeration functionality.

[0005] A compressor control system according to a first aspect of the present invention includes a power supply for generating a power input voltage; a compressor, wherein a power input voltage circuit is provided between the compressor and the power supply; a main board electrically connected to the power input voltage circuit, wherein the main board controls the on / off state of the power input voltage circuit during operation; and a first temperature sensor for detecting indoor temperature, wherein the first temperature sensor is electrically connected to the main board and transmits an electrical signal to the main board, and wherein the first temperature sensor is electrically connected to a first fixed resistor.

[0006] According to an embodiment of the present invention, a compressor control system has at least the following technical effects: by electrically connecting a first temperature sensor to a first fixed resistor, the resistance of which is constant, and unlike the existing indoor ambient temperature NTC, whose resistance decreases with increasing temperature and increases with decreasing temperature, the resistance of the first fixed resistor corresponding to the first temperature sensor does not change with temperature rise or fall. This ensures that the electrical signal transmitted from the first temperature sensor to the main board is always a high-level signal, preventing the main board from disconnecting the power supply voltage input circuit when the indoor temperature drops below 15°C. This ensures that the main board can still connect the power supply voltage input circuit when the indoor temperature is below 0°C, allowing the compressor to operate normally when the indoor temperature is below 0°C, thus providing conditions for converting ordinary air conditioners into air conditioners with refrigeration functions.

[0007] According to some embodiments of the present invention, a first temperature sensing head is provided at one end of the first temperature sensor, a first fixed resistor is disposed inside the first temperature sensing head, and a first male plug is provided at the end of the first temperature sensor away from the first temperature sensing head; a first female plug matching the first male plug is provided on the motherboard.

[0008] According to some embodiments of the present invention, the resistance of the first fixed resistor is equal to the resistance of the indoor ambient temperature NTC at 25°C.

[0009] According to some embodiments of the present invention, the power supply voltage input circuit is provided with a first relay, which is electrically connected between the motherboard and the compressor. When energized, the motherboard controls the first relay to close, so that the compressor is connected to the power supply via the power supply voltage input circuit.

[0010] According to some embodiments of the present invention, an intelligent temperature control switch is connected in series in the circuit between the power supply and the first temperature sensor. When the indoor temperature reaches the set cooling temperature, the intelligent temperature control switch controls the compressor to stop working.

[0011] According to some embodiments of the present invention, a pipe temperature sensor for detecting the pipe wall temperature of the evaporator and / or condenser is further included. The pipe temperature sensor is provided with a second fixed resistor. The pipe temperature sensor is electrically connected to the main board and transmits an electrical signal to the main board.

[0012] According to some embodiments of the present invention, a third temperature sensor is further included for detecting the temperature of the aluminum fins of the evaporator and / or condenser, the third temperature sensor being electrically connected to a third fixed resistor, the third temperature sensor being electrically connected to the main board and transmitting an electrical signal to the main board.

[0013] According to some embodiments of the present invention, one end of the pipe temperature sensor is provided with a pipe temperature sensing head, the second fixed resistor is disposed inside the pipe temperature sensing head, the other end of the pipe temperature sensor is connected to a second male plug, and the main board is provided with a second female plug that matches the second male plug; one end of the third temperature sensor is provided with a third temperature sensing head, the third fixed resistor is disposed inside the third temperature sensing head, and the other end of the third temperature sensor is electrically connected to the second male plug.

[0014] According to some embodiments of the present invention, the resistance value of the second fixed resistor is equal to the resistance value of the tube temperature NTC at 25°C; the resistance value of the third fixed resistor is equal to the resistance value of the tube temperature NTC at 25°C.

[0015] According to a second aspect of the present invention, an air conditioner with a wide temperature range includes a compressor, an evaporator, and a condenser connected in sequence via pipes to form a circulation loop. An expansion valve is provided between the evaporator and the condenser. The compressor is controlled by any of the control systems described above.

[0016] An air conditioner with a wide temperature range according to an embodiment of the present invention has at least the following technical effects: By electrically connecting a first temperature sensor to a first fixed resistor, the resistance of which is constant, unlike the existing indoor ambient temperature NTC which decreases with increasing temperature and increases with decreasing temperature, the resistance of the first fixed resistor corresponding to the first temperature sensor does not change with temperature rise or fall. This ensures that the electrical signal transmitted from the first temperature sensor to the main board is always a high-level signal, preventing the main board from disconnecting the power supply voltage input circuit when the indoor temperature drops below 15°C. This ensures that the main board can still control the power supply voltage input circuit to be connected when the indoor temperature is below 0°C, allowing the compressor to operate normally when the indoor temperature is below 0°C. Consequently, the air conditioner of the present invention can cool the indoor temperature to below 0°C, providing a wide temperature range. Compared to existing ordinary household air conditioners, the air conditioner of the present invention can achieve both ordinary cooling and can be used as a refrigeration unit to cool to -20°C in small enclosed spaces.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the compressor control circuit in an existing air conditioner;

[0020] Figure 2 This is a schematic diagram of the assembly structure of the motherboard and the first temperature sensor in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the assembly structure of the motherboard, pipe temperature sensor, third temperature sensor and evaporator in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram illustrating the principle of an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the control circuit for the compressor in an embodiment of the present invention.

[0024] Figure label:

[0025] 1-Indoor ambient temperature NTC; 2-Pipe temperature NTC;

[0026] 100 - Mainboard, 110 - First female connector, 120 - Second female connector;

[0027] 200 - First temperature sensor, 210 - First temperature sensing head, 220 - First male connector, 230 - First fixed resistor;

[0028] 300 evaporator;

[0029] 400 - Pipe temperature sensor, 410 - Pipe temperature sensor, 420 - Second male connector;

[0030] 500 - Third temperature sensor, 510 - Third sensor, 520 - Second fixed resistor;

[0031] 600-Power Supply;

[0032] 700-Compressor;

[0033] 800 - Power supply voltage input circuit; 810 - First relay;

[0034] 900-Intelligent Temperature Control Switch. Detailed Implementation

[0035] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0036] In the description of this invention, it should be understood that the orientation descriptions, such as "up", "down", "front", "back", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0037] In the description of this invention, the terms "first," "second," "third," etc., are used only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0038] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0039] Reference Figure 2 , Figure 4 and Figure 5 As shown, a compressor control system according to an embodiment of the present invention includes a power supply 600, a compressor 700, a main board 100, and a first temperature sensor 200. The power supply 600 is used to generate a power input voltage. A power voltage input circuit 800 is provided between the compressor 700 and the power supply 600. The main board 100 is electrically connected to the power voltage input circuit 800. During operation, the main board 100 is used to control the on / off state of the power voltage input circuit 800. The first temperature sensor 200 is used to detect the indoor temperature. The first temperature sensor 200 is electrically connected to the main board 100 and transmits an electrical signal to the main board 100. The first temperature sensor 200 is electrically connected to a first fixed resistor 230. Compared with the prior art, the embodiments of the present invention electrically connect the first temperature sensor 200 to the first fixed resistor 230. The resistance value of the first fixed resistor 230 is constant. Compared with the existing indoor ambient temperature NTC1, whose resistance value decreases with increasing temperature and increases with decreasing temperature, the resistance value of the first fixed resistor 230 corresponding to the first temperature sensor 200 does not change with the increase or decrease of temperature. This ensures that the electrical signal transmitted from the first temperature sensor 200 to the main board 100 is always a high-level signal. This prevents the main board 100 from disconnecting the power supply voltage input circuit 800 when the indoor temperature drops below 15°C. It ensures that the main board 100 can still control the power supply voltage input circuit 800 to be connected when the indoor temperature is below 0°C, so that the compressor 700 can work normally when the indoor temperature is below 0°C. This provides the conditions for converting ordinary air conditioners into air conditioners with refrigeration functions.

[0040] In some embodiments of the present invention, a first temperature sensor 200 is provided with a first temperature sensing head 210 at one end, a first fixed resistor 230 is disposed inside the first temperature sensing head 210, and a first male connector 220 is provided at the end of the first temperature sensor 200 away from the first temperature sensing head 210; a first female connector 110 matching the first male connector 220 is provided on the motherboard 100. This configuration allows the first temperature sensor 200 to be electrically connected to the motherboard 100 through the insertion and engagement of the first male connector 220 and the first female connector 110. The first temperature sensor 200 transmits electrical signals to the motherboard 100 via a data cable, ensuring stable transmission and facilitating easy disassembly, assembly, repair, and replacement. Furthermore, by placing the first fixed resistor 230 inside the first temperature sensing head 210, the structure of the first temperature sensor 200 can be further miniaturized, and the first fixed resistor 230 can be avoided from being exposed on the outer surface and easily damaged.

[0041] In some embodiments of the present invention, the resistance of the first fixed resistor 230 is equal to the resistance of the indoor ambient temperature NTC1 at 25°C. The indoor ambient temperature NTC1 is a temperature sensor used to detect indoor temperature in ordinary household air conditioners on the market. The resistance of the indoor ambient temperature NTC1 decreases as the temperature rises and increases as the temperature falls. According to the set operating state, the indoor ambient temperature NTC1 detects the indoor ambient temperature and controls the compressor 700 to automatically start and stop or use frequency conversion via the main board 100. It is worth noting that the temperature setting range of the indoor ambient temperature NTC1 is generally between 15℃ and 30℃. Therefore, it will not work for cooling below 15℃ and will not work for heating above 30℃. In the industry, the resistance value of the indoor ambient temperature NTC1 at 25℃ is called the nominal value. This ensures that the electrical signal transmitted to the main board 100 is always at a high level, allowing the compressor 700 to operate normally. By setting the resistance value of the first fixed resistor 230 to be equal to the resistance value of the indoor ambient temperature NTC1 at 25℃, and since the resistance value of the first fixed resistor 230 is constant and does not change with the indoor temperature, the electrical signal transmitted from the first temperature sensor 200 to the main board 100 is always at a high level. This ensures that the main board 100 can control the power supply voltage input circuit 800 to be connected even when the indoor temperature is below 0℃, allowing the compressor 700 to operate normally when the indoor temperature is below 0℃. This provides the conditions for converting ordinary air conditioners into air conditioners with refrigeration functions.

[0042] In some embodiments of the present invention, the power supply voltage input circuit 800 is provided with a first relay 810, which is electrically connected between the main board 100 and the compressor 700. When powered on, the main board 100 controls the first relay 810 to close, so that the compressor 700 is connected to the power supply 600 via the power supply voltage input circuit 800. The first relay 810 is a normally open relay. When the main board 100 is not powered on, the first relay 810 is not closed, and the power supply voltage input circuit 800 stops the compressor 700 from working. When the main board 100 is powered on, the first relay 810 closes, the power supply voltage input circuit 800 is connected, and the compressor 700 works normally. The main board 100 is powered on according to the electrical signal transmitted by the first temperature sensor 200, thereby controlling the compressor 700 to work normally or stop working. Preferably, the main board 100 is provided with a CPU electrically connected to the first temperature sensor 200. The CPU receives the electrical signal transmitted by the first temperature sensor 200 and controls the opening and closing of the first relay 810. The CPU receives signals quickly and responds quickly, enabling it to accurately and rapidly judge the electrical signals transmitted by the first temperature sensor 200 and control the first relay 810 to close or open, thereby achieving automatic control of the compressor 700 to start or stop.

[0043] like Figure 4 As shown, a smart temperature control switch 900 is connected in series in the circuit between the power supply 600 and the first temperature sensor 200. When the indoor temperature reaches the set cooling temperature, the smart temperature control switch 900 controls the compressor 700 to stop working. The smart temperature control switch 900 uses a commercially available model. The smart temperature control switch 900 can input the cooling temperature value into its internal control software via a button. The smart temperature control switch 900 can also automatically detect the indoor temperature. When the indoor temperature drops to the set cooling temperature value, the smart temperature control switch 900 disconnects, causing the power supply voltage input circuit 800 to shut down, thereby stopping the compressor 700. This facilitates accurate control of the indoor temperature to the required cooling temperature, meeting the temperature requirements of different frozen products. Figure 4 As shown, specifically, plug the smart thermostat switch 900 into a household socket, and then plug the air conditioner plug into the smart thermostat switch 900. It can be understood that power supply 600 refers to a 220V household circuit, and household socket refers to the interface for connecting power supply 600. Plug the smart thermostat switch 900 into the household socket, and then plug the air conditioner plug into the smart thermostat switch 900 to connect the air conditioner to the household circuit.

[0044] like Figure 3As shown, in some embodiments of the present invention, a pipe temperature sensor 400 is also included to detect the pipe wall temperature of the evaporator 300 and / or the condenser. The pipe temperature sensor 400 is provided with a second fixed resistor 520. The pipe temperature sensor 400 is electrically connected to the main board 100 and transmits electrical signals to the main board 100. Because the resistance of the pipe temperature NTC2 sensor used to detect the pipe wall temperature of the evaporator 300 and / or condenser in existing ordinary household air conditioners decreases as the temperature rises and increases as the temperature falls, when the pipe temperature drops below 5°C, the resistance of the pipe temperature NTC2 increases as the temperature decreases, causing the electrical signal transmitted to the main board 100 to be a low-level signal. The main board 100 then controls the compressor 700 to stop working; that is, the compressor 700 does not cool when the pipe wall temperature of the evaporator 300 and / or condenser is below 5°C. To ensure that the compressor 700 operates normally when the pipe wall temperature is below 0°C, a second fixed resistor 520 is set inside the pipe temperature sensor 400. The resistance value of the second fixed resistor 520 does not change with the pipe wall temperature, ensuring that the electrical signal transmitted from the pipe temperature sensor 400 to the main board 100 is always a high-level signal, preventing the main board 100 from changing with the evaporator 300 temperature. After the pipe wall temperature of the condenser drops below 5°C, the control power supply voltage input circuit 800 is disconnected; this ensures that the main board 100 can still connect the control power supply voltage input circuit 800 when the pipe wall temperature is below 0°C, so that the compressor 700 can work normally when the pipe wall temperature is below 0°C, thus providing the conditions for converting an ordinary air conditioner into an air conditioner with refrigeration function.

[0045] like Figure 3As shown, in some embodiments of the present invention, a third temperature sensor 500 for detecting the temperature of the aluminum fins of the evaporator 300 and / or condenser is also included. The third temperature sensor 500 is electrically connected to a third fixed resistor and is electrically connected to the main board 100, transmitting an electrical signal to the main board 100. Since the resistance of the NTC plate temperature sensor used to detect the temperature of the aluminum fins of the evaporator 300 and / or condenser in existing ordinary household air conditioners decreases as the temperature increases and increases as the temperature decreases, when the temperature of the aluminum fins drops below 5°C, the resistance of the NTC plate temperature sensor increases as the temperature decreases, causing the electrical signal transmitted to the main board 100 to be a low-level signal. The main board 100 then controls the compressor 700 to stop working, i.e., the compressor 700... The compressor 700 does not operate when the temperature of the aluminum fins of the evaporator 300 and / or condenser is below 5°C. To ensure that the compressor 700 operates normally when the temperature of the aluminum fins is below 0°C, a third fixed resistor is installed in the third temperature sensor 500. The resistance value of the third fixed resistor does not change with the temperature of the aluminum fins, ensuring that the electrical signal transmitted from the third temperature sensor 500 to the main board 100 is always a high-level signal. This prevents the main board 100 from disconnecting the power supply voltage input circuit 800 when the temperature of the aluminum fins of the evaporator 300 and / or condenser drops below 5°C. This ensures that the main board 100 can still connect the power supply voltage input circuit 800 when the temperature of the aluminum fins is below 0°C, allowing the compressor 700 to operate normally when the pipe wall temperature is below 0°C, thus providing the conditions for converting a regular air conditioner into an air conditioner with refrigeration function.

[0046] like Figure 3 As shown, in some embodiments of the present invention, one end of the pipe temperature sensor 400 is provided with a pipe temperature sensing head 410, and a second fixed resistor 520 is disposed inside the pipe temperature sensing head 410. The other end of the pipe temperature sensor 400 is connected to a second male plug 420, and a second female plug 120 matching the second male plug 420 is provided on the main board 100. One end of the third temperature sensor 500 is provided with a third temperature sensing head, and a third fixed resistor is disposed inside the third temperature sensing head. The other end of the third temperature sensor 500 is electrically connected to the second male plug 420. With this configuration, only the second male plug 420 and the second female plug 120 need to be plugged in to electrically connect both the pipe temperature sensor 400 and the third temperature sensor 500 to the main board 100 simultaneously. This reduces the number of plugs and facilitates the wiring layout, making the embodiments of the present invention simpler and easier to maintain.

[0047] In some embodiments of the present invention, the resistance of the second fixed resistor 520 is equal to the resistance of the pipe temperature NTC2 at 25°C; the resistance of the third fixed resistor is equal to the resistance of the pipe temperature NTC2 at 25°C. The pipe temperature NTC2 is a temperature sensor commonly used in commercially available household air conditioners to detect the pipe wall temperature of the evaporator 300 and / or condenser. The resistance of the pipe temperature NTC2 decreases as the temperature increases and increases as the temperature decreases. According to the set operating state, the pipe temperature NTC2 detects the pipe wall temperature of the evaporator 300 and / or condenser and controls the compressor 700 to automatically start / stop or use frequency conversion via the main board 100. It is worth noting that the temperature setting range is generally between 5℃ and 30℃. Therefore, cooling will not work below 5℃ and heating will not work above 30℃. In the industry, the resistance of the air conditioner's NTC2 at 25℃ is called the nominal value. This ensures that the electrical signal transmitted to the main board 100 is always at a high level, allowing the compressor 700 to operate normally. This is achieved by setting the resistance values ​​of the second and third fixed resistors to be equal to the resistance value of NTC2 at 25℃. The resistance values ​​of resistor 520 and the third fixed resistor are constant and will not change with the temperature of the pipe wall and the aluminum fins. This ensures that the electrical signals transmitted from the pipe temperature sensor 400 and the third temperature sensor 500 to the main board 100 are always at a high level. This ensures that the main board 100 can control the power supply voltage input circuit 800 to connect even when the pipe wall temperature and / or the aluminum fin temperature is below 0°C. This allows the compressor 700 to operate normally when the pipe wall temperature and / or the aluminum fin temperature is below 0°C, providing the conditions for converting an ordinary air conditioner into an air conditioner with a refrigeration function.

[0048] like Figure 1As shown, commonly used NTC sensors in air conditioners include three types: indoor ambient temperature NTC1, indoor coil temperature NTC2, and aluminum fin temperature NTC. In the circuit, temperature changes cause changes in the resistance of the NTC, which in turn changes the voltage at the CPU terminals. The CPU determines the air conditioner's operating state based on these voltage changes. The working principle of an air conditioner temperature sensor is as follows: The air conditioner temperature sensor is connected in series with a resistor to divide a 5V (some air conditioners use +3.3V) voltage. The divided voltage is then sent to the CPU. Since air conditioner temperature sensors use negative temperature coefficient thermistors, their resistance decreases as the temperature rises and increases as the temperature falls. Therefore, the CPU's input voltage follows this pattern: as the temperature rises, the CPU's input voltage increases; as the temperature falls, the CPU's input voltage decreases. This changing voltage is analyzed and processed by the CPU to determine the current coil temperature or room temperature, and then, through internal programs and manual settings, controls the air conditioner's operating state. Because the sampling voltage sent to the CPU varies considerably with temperature, manufacturers typically design it to be half the power supply voltage, based on a 25-degree Celsius temperature, to allow sufficient margin for voltage fluctuations caused by temperature changes. If the sampling voltage is designed to be too high or too low, it will not accurately reflect the current temperature changes. Therefore, if... Figure 5 As shown, in this embodiment of the invention, by replacing the resistance of the indoor ambient temperature NTC1 with a first fixed resistor 230 and the resistance of the pipe temperature NTC2 with a second fixed resistor 520, the resistance of the air conditioner temperature sensor in the improved control system of the present invention is constant, that is, its resistance does not change with temperature. This ensures that the voltage at the CPU terminal does not change with temperature, thereby allowing the compressor 700 to operate normally when the indoor temperature is below 0°C, providing conditions for converting an ordinary air conditioner into an air conditioner with a refrigeration function. The specific cooling temperature is accurately controlled by the intelligent temperature control switch 900.

[0049] Reference Figures 2 to 5As shown, an air conditioner with a wide temperature range according to a second aspect embodiment of the present invention includes a compressor 700, an evaporator 300, and a condenser connected in sequence by pipes to form a circulation loop. An expansion valve is provided between the evaporator 300 and the condenser. The compressor 700 is controlled by any of the aforementioned control systems. Compared with the prior art, the embodiment of the present invention connects the first temperature sensor 200 to a first fixed resistor 230. The resistance value of the first fixed resistor 230 is constant. Compared with the existing indoor ambient temperature NTC1, whose resistance decreases with increasing temperature and increases with decreasing temperature, the resistance value of the first fixed resistor 230 corresponding to the first temperature sensor 200 does not change with the increase or decrease of temperature. This ensures that the electrical signal transmitted from the first temperature sensor 200 to the main board 100 is always a high-level signal. This prevents the main board 100 from disconnecting the power supply voltage input circuit 800 when the indoor temperature drops below 15°C. It ensures that the main board 100 can still control the power supply voltage input circuit 800 to be connected when the indoor temperature is below 0°C, so that the compressor 700 can work normally when the indoor temperature is below 0°C. As a result, the air conditioner of the embodiment of the present invention can cool the indoor temperature to below 0°C, with a wide temperature adjustment range. Compared with existing ordinary household air conditioners, the air conditioner of the embodiment of the present invention can not only realize the function of ordinary cooling, but also realize the function of cooling to -20°C in small enclosed spaces as a freezer, reducing the cost of purchasing a separate freezer.

[0050] In some embodiments of the present invention, the evaporator 300 is a finned evaporator, and the condenser is a finned condenser. Finned condensers and finned evaporators have good heat exchange effects, improve energy efficiency, and facilitate the detection of the temperature of the copper tube wall and the temperature of the aluminum fins by the tube temperature sensor 400 and the third temperature sensor 500, respectively.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations; any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A compressor control system, characterized in that, include: Power supply (600), used to generate power input voltage; A power supply voltage input circuit (800) is provided between the compressor (700) and the power supply (600); The motherboard (100) is electrically connected to the power supply voltage input circuit (800). During operation, the motherboard (100) is used to control the on / off state of the power supply voltage input circuit (800). A first temperature sensor (200) is used to detect the indoor temperature. The first temperature sensor (200) is electrically connected to the main board (100) and transmits electrical signals to the main board (100). The first temperature sensor (200) is electrically connected to a first fixed resistor (230). The resistance of the first fixed resistor (230) is equal to the resistance of the indoor ambient temperature NTC at 25°C. A smart temperature control switch (900) is connected in series in the circuit between the power supply (600) and the first temperature sensor (200). When the indoor temperature reaches the set cooling temperature, the smart temperature control switch (900) controls the compressor (700) to stop working. It also includes a third temperature sensor (500) for detecting the temperature of the aluminum fins of the evaporator (300) and / or condenser, the third temperature sensor (500) being electrically connected to a third fixed resistor, the third temperature sensor (500) being electrically connected to the main board (100) and transmitting electrical signals to the main board (100).

2. The compressor control system according to claim 1, characterized in that, One end of the first temperature sensor (200) is provided with a first temperature sensing head (210), the first fixed resistor (230) is disposed inside the first temperature sensing head (210), and the end of the first temperature sensor (200) away from the first temperature sensing head (210) is provided with a first male plug (220); the motherboard (100) is provided with a first female plug (110) that matches the first male plug (220).

3. The compressor control system according to claim 1, characterized in that, The power supply voltage input circuit (800) is provided with a first relay (810), which is electrically connected between the main board (100) and the compressor (700). When powered on, the main board (100) controls the first relay (810) to close, so that the compressor (700) is connected to the power supply (600) via the power supply voltage input circuit (800).

4. The compressor control system according to claim 1, characterized in that, It also includes a pipe temperature sensor (400) for detecting the pipe wall temperature of the evaporator (300) and / or condenser. The pipe temperature sensor (400) is provided with a second fixed resistor (520). The pipe temperature sensor (400) is electrically connected to the main board (100) and transmits electrical signals to the main board (100).

5. The compressor control system according to claim 4, characterized in that, One end of the pipe temperature sensor (400) is provided with a pipe temperature sensing head (410), and the second fixed resistor (520) is disposed inside the pipe temperature sensing head (410). The other end of the pipe temperature sensor (400) is connected to a second male plug (420). The main board (100) is provided with a second female plug (120) that matches the second male plug (420). One end of the third temperature sensor (500) is provided with a third temperature sensing head, and the third fixed resistor is disposed inside the third temperature sensing head. The other end of the third temperature sensor (500) is electrically connected to the second male plug (420).

6. The compressor control system according to claim 4, characterized in that, The resistance of the second fixed resistor (520) is equal to the resistance of the tube temperature NTC at 25°C; the resistance of the third fixed resistor is equal to the resistance of the tube temperature NTC at 25°C.

7. An air conditioner with a wide temperature range, characterized in that, The system includes a compressor (700), an evaporator (300), and a condenser that are connected in sequence via pipes to form a circulation loop. An expansion valve is provided between the evaporator (300) and the condenser. The compressor (700) is controlled by a control system as described in any one of claims 1 to 6.

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