Parking air conditioner control circuit and parking air conditioner

Abstract

The utility model discloses a parking air conditioner control circuit and a parking air conditioner, and the parking air conditioner control circuit comprises a liquid level monitoring circuit; the control chip is electrically connected with the output end of the liquid level monitoring circuit, and is used for outputting a first adjusting signal if the parking air conditioner is in a refrigeration mode when the voltage value of the liquid level monitoring signal reaches a first preset voltage value, and outputting a second adjusting signal if the parking air conditioner is in a non-refrigeration mode; the controlled end of the first driving module is electrically connected with the control chip, the first output end of the first driving module is used for being connected into an inner fan, and the second output end of the first driving module is used for being connected into an outer fan; the first driving module is used for reducing the rotating speed of the inner fan to a preset first reference rotating speed according to the first adjusting signal, or reducing the rotating speed of the outer fan to a preset second reference rotating speed according to the second adjusting signal; the technical scheme of the utility model aims to prevent overflow or water leakage of the liquid discharge groove.

Description

Technical Field

[0001] The utility model relates to the technical field of parking air conditioners, in particular to a parking air conditioner control circuit and a parking air conditioner. Background Art

[0002] Currently, parking air conditioning systems (especially those that run with trucks for long periods of time) face the problem of drain pipe or trough blockage caused by external factors such as dust and insects, which may cause overflow or leakage of the drain pan, leading to user complaints and increased repair possibilities. To solve this problem, some companies have proposed the concept of air conditioning systems equipped with drain tank level detection. However, these systems can only remind users to pour water in time when the drain pan is full of water, and cannot prevent overflow or leakage of the drain tank. Utility Model Content

[0003] The main purpose of the utility model is to provide a parking air conditioner control circuit and a parking air conditioner, aiming to prevent overflow or leakage of a drainage tank.

[0004] To achieve the above-mentioned purpose, the utility model provides a parking air conditioner control circuit, wherein the parking air conditioner includes a drain tank, an inner fan and an outer fan, and is characterized in that the parking air conditioner control circuit includes:

[0005] A liquid level monitoring circuit is arranged in the liquid drain tank, and is used to detect the liquid level in the liquid drain tank in real time and output a corresponding liquid level monitoring signal;

[0006] a control chip, electrically connected to the output end of the liquid level monitoring circuit, and configured to output a first regulating signal if the parking air conditioner is in a cooling mode, and output a second regulating signal if the parking air conditioner is in a non-cooling mode, when the voltage value of the liquid level monitoring signal reaches a first preset voltage value;

[0007] A first driving module, wherein a controlled end of the first driving module is electrically connected to the control chip, a first output end of the first driving module is used to connect to the internal fan, and a second output end of the first driving module is used to connect to the external fan; the first driving module is also used to reduce the rotation speed of the internal fan to a preset first reference rotation speed according to the first regulating signal, or to reduce the rotation speed of the external fan to a preset second reference rotation speed according to the second regulating signal.

[0008] In some embodiments, the liquid level monitoring circuit includes:

[0009] An output interface, comprising a power pin, an output pin and a ground pin, wherein the power pin is used to connect to a first power source, and the ground pin is grounded;

[0010] Liquid level sensor;

[0011] A first resistor, connected in series between the output end of the liquid level sensor and the output pin;

[0012] A second resistor is connected in series between the output pin and the ground;

[0013] A first capacitor connected in series between the output end of the liquid level sensor and the ground;

[0014] A first electrostatic tube, wherein the cathode of the first electrostatic tube is used to connect to the first power supply, the anode of the first electrostatic tube is grounded, and the third end of the first electrostatic tube is connected to the output pin.

[0015] In some embodiments, the first driving module includes:

[0016] a first drive branch, wherein an input end of the first drive branch is electrically connected to the control chip, an output end of the first drive branch is used to connect to the indoor fan, and the first drive branch is further used to adjust the speed of the indoor fan according to the first adjustment signal;

[0017] The second drive branch, the input end of the second drive branch is electrically connected to the control chip, the output end of the second drive branch is used to connect to the external fan, and the second drive branch is also used to adjust the speed of the external fan according to the second adjustment signal.

[0018] In some embodiments, the first driving branch comprises:

[0019] a first intelligent power module, wherein a plurality of signal input terminals of the first intelligent power module are electrically connected to the control chip, and a plurality of output terminals of the first intelligent power module are used to be respectively connected to the internal fans;

[0020] a first current detection circuit, wherein an input end of the first current detection circuit is connected to a current detection end of the first intelligent power module, and an output end of the first current detection circuit is electrically connected to the control chip, and is used to output a corresponding first current detection signal to the control chip;

[0021] The control chip is further used to adjust the multiple first control signals input to the first intelligent power module according to the received first current detection signal.

[0022] In some embodiments, the parking air conditioner further includes a fan, and the parking air conditioner control circuit further includes:

[0023] A second driving module, wherein a controlled end of the second driving module is electrically connected to the control chip, and an output end of the second driving module is used to connect to the compressor;

[0024] The control chip is also used to control the second driving module to adjust the operating frequency of the compressor to a preset reference frequency when the voltage value of the connected liquid level monitoring signal reaches a first preset voltage value.

[0025] In some embodiments, the second driving module includes:

[0026] a second intelligent power module, wherein a plurality of signal input terminals of the second intelligent power module are electrically connected to the control chip, and a plurality of output terminals of the second intelligent power module are used for outputting multi-phase alternating current in a one-to-one correspondence;

[0027] a second current detection circuit, wherein an input end of the second current detection circuit is connected to a current detection end of the second intelligent power module, and an output end of the second current detection circuit is electrically connected to the control chip, and is used to output a corresponding second current detection signal to the control chip;

[0028] The control chip is further used to adjust the multiple second control signals input to the second intelligent power module according to the received second current detection signal.

[0029] In some embodiments, the parking air conditioning control circuit further includes:

[0030] An overcurrent protection circuit, wherein the input end of the overcurrent protection circuit is connected to the current detection pin of the second intelligent power module, and the output end of the overcurrent protection circuit is connected to the protection trigger end of the second intelligent power module, and is used to output a corresponding overcurrent protection signal when it is detected that the current value of the second intelligent power module reaches a preset reference current value, so as to trigger the second intelligent power module to stop working.

[0031] In some embodiments, the parking air conditioning control circuit further includes:

[0032] A timer, the output end of which is electrically connected to the control chip, for timing after being triggered and outputting a corresponding timing end signal after reaching a preset timing period;

[0033] The control chip is also used to trigger the timer to start timing when the voltage value of the connected liquid level monitoring signal reaches a first preset voltage value; and,

[0034] It is also used to control the first driving module to stop driving the compressor and output corresponding alarm information when the timing end signal is received and the voltage value of the liquid level monitoring signal still reaches the first preset voltage value.

[0035] The utility model also provides a parking air conditioner, comprising a drain tank, an inner fan, an outer fan and the above-mentioned parking air conditioner control circuit;

[0036] The parking air conditioning control circuit is electrically connected to the inner fan and the outer fan respectively;

[0037] The inner fan includes a first condensate collecting pipe, and the outer fan includes a second condensate collecting pipe. The first condensate collecting pipe and the second condensate collecting pipe are both connected to the drainage trough and flow into the drainage trough.

[0038] In some embodiments, two drain valves are spaced apart at the bottom of the drain tank, and each of the drain valves is electrically connected to the parking air conditioning control circuit;

[0039] The parking air conditioning control circuit is also used to control the two drain valves to open simultaneously when the voltage value of the connected liquid level monitoring signal reaches a first preset voltage value, and to control any one of the drain valves to open when the voltage value of the connected liquid level monitoring signal does not reach the first preset voltage value.

[0040] The technical solution of the utility model detects the liquid level in the drain tank in real time by setting a first preset voltage value corresponding to the warning liquid level. When it is detected that the liquid level reaches the warning liquid level, the speed of the inner fan or the outer fan of the parking air conditioner is promptly controlled according to the working mode of the parking air conditioner, so as to reduce the heat exchange of the parking air conditioner, thereby reducing the generation of condensed water, reducing the liquid inlet speed of the drain tank, and preventing the drain tank from overflowing or leaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0042] Figure 1 It is a structural schematic diagram of an embodiment of the parking air conditioning control circuit of the utility model;

[0043] Figure 2 It is a structural schematic diagram of another embodiment of the parking air conditioning control circuit of the utility model;

[0044] Figure 3 It is a structural schematic diagram of another embodiment of the parking air conditioning control circuit of the utility model;

[0045] Figure 4 It is a structural schematic diagram of another embodiment of the parking air conditioning control circuit of the utility model;

[0046] Figure 5It is a structural schematic diagram of another embodiment of the parking air conditioning control circuit of the utility model;

[0047] Figure 6 It is a structural schematic diagram of yet another embodiment of the parking air conditioning control circuit of the utility model;

[0048] Figure 7 This is a structural schematic diagram of an embodiment of the parking air conditioner of the utility model;

[0049] Figure 8 This is a circuit connection diagram of an embodiment of a liquid level monitoring circuit in the utility model;

[0050] Fig. 9 This is a circuit connection diagram of an embodiment of the first intelligent power module of the present utility model;

[0051] Fig.10 A circuit connection diagram of an embodiment of a first current detection circuit in the utility model;

[0052] Fig.11 A circuit connection diagram of an embodiment of a second intelligent power module in the present utility model;

[0053] Fig.12 A circuit connection diagram of an embodiment of a second current detection circuit in the utility model;

[0054] Fig.13 A circuit connection diagram of an embodiment of an overcurrent protection circuit in the utility model;

[0055] Fig.14 It is a structural schematic diagram of the liquid drain tank in the utility model;

[0056] Fig.15 It is a side view of the drain tank in the utility model.

[0057] Description of Figure Numbers:

[0058] Label name Label name 100 Parking air conditioning control circuit 143 Overcurrent protection circuit 110 Liquid level monitoring circuit 150 Timer 120 Control chip 200 Drainage tank 130 First driver module 210 Drain valve 131 The first driving branch 300 Internal fan 132 The first intelligent power module 400 External fan 133 First current detection circuit J1 Output Interface 134 The second driving branch TZ1~TZ2 The first electrostatic tube ~ the second electrostatic tube 140 Second driver module U1~U3 First operational amplifier to third operational amplifier 141 Second intelligent power module C1~C13 The first capacitor to the thirteenth capacitor 142 Second current detection circuit R1~R19 The first resistor to the nineteenth resistor

[0059] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0061] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0062] The utility model provides a parking air conditioner control circuit. The parking air conditioner comprises a liquid drain tank, an inner fan and an outer fan.

[0063] Reference Figure 1 In one embodiment, the parking air conditioning control circuit includes:

[0064] The liquid level monitoring circuit 110 is disposed in the liquid drain tank and is used to detect the liquid level in the liquid drain tank in real time and output a corresponding liquid level monitoring signal;

[0065] The control chip 120 is electrically connected to the output end of the liquid level monitoring circuit 110, and is used to output a first adjustment signal if the parking air conditioner is in a cooling mode, and output a second adjustment signal if the parking air conditioner is in a non-cooling mode when the voltage value of the liquid level monitoring signal reaches a first preset voltage value;

[0066] The first driving module 130, the controlled end of the first driving module 130 is electrically connected to the control chip 120, the first output end of the first driving module 130 is used to connect to the internal fan, and the second output end of the first driving module 130 is used to connect to the external fan; the first driving module 130 is used to reduce the rotation speed of the internal fan to a preset first reference rotation speed according to a first adjustment signal, or reduce the rotation speed of the external fan to a preset second reference rotation speed according to a second adjustment signal.

[0067] It should be noted that parking air conditioners usually have both heating and cooling functions, and both heating and cooling functions require two heat exchanges, indoors and outdoors, where the indoor fan controls the heat exchange of the refrigerant indoors, and the outdoor fan controls the heat exchange of the refrigerant outdoors: when the parking air conditioner performs the cooling function, the refrigerant is used to exchange heat indoors and output it to the outdoors. Due to the condition for the generation of condensed water, the temperature of the outside of the pipe wall where the refrigerant is located is higher than the temperature inside, so that the water vapor on the outside is liquefied on the outside of the pipe wall. Therefore, when realizing indoor heat exchange, it is easy to produce condensed water at the indoor fan. When the parking air conditioner performs the cooling function, the indoor cold air is exchanged with the heat exchange device, the indoor air is heated, and the absorbed cold air is released outdoors. Therefore, when realizing outdoor heat exchange, it is easy to produce condensed water at the outdoor fan.

[0068] Therefore, in this embodiment, the inner fan and the outer fan are controlled respectively for the areas where condensation water is easily generated in different modes of the parking air conditioner. Specifically, when the parking air conditioner is working, the liquid level monitoring circuit 110 detects the liquid level in the drain tank in real time. It can be understood that the liquid level monitoring circuit 110 can be a capacitive liquid level detector, which can output a liquid level monitoring signal corresponding to the current liquid level in real time through the capacitance value corresponding to the current liquid level, or it can be a photoelectric liquid level detector. When the liquid level reaches the detection point where the liquid level monitoring circuit 110 is located, it outputs a liquid level monitoring signal indicating that the liquid level has reached a critical value.

[0069] After the control chip 120 receives the liquid level monitoring signal output by the liquid level monitoring module, the voltage value of the liquid level monitoring signal is compared with the voltage value of the preset warning liquid level through the internal integrated comparator. The reference liquid level is the warning liquid level of the drain tank, that is, the liquid level value obtained by the R&D personnel according to the full water level of the drain tank. When the voltage value of the liquid level monitoring signal reaches the voltage value of the reference liquid level, it means that the liquid level of the drain tank has reached the warning liquid level and the liquid level needs to be controlled. At this time, the control chip 120 controls the internal and external fans according to the operation mode of the parking air conditioner.

[0070] When the parking air conditioner is in cooling mode, it means that the condensed water is mainly due to the faster heat exchange in the room. At this time, the control chip 120 outputs a first speed adjustment signal to reduce the speed of the internal fan until it reaches a preset first reference speed. The first reference speed can be a lower speed such as 150 rpm or 200 rpm, thereby reducing the flow rate of the refrigerant and reducing the accumulation of condensed water due to the excessive heat exchange capacity of the internal fan.

[0071] When the parking air conditioner is in heating mode, it means that the condensed water is mainly caused by the faster heat exchange outdoors. At this time, the control chip 120 outputs a second speed adjustment signal to reduce the speed of the external fan until it reaches a preset second reference speed. The second reference speed can be equal to the first reference speed or higher than the first reference speed, thereby reducing the flow rate of the refrigerant and reducing the accumulation of condensed water due to the excessive heat exchange capacity of the external fan.

[0072] The technical solution of the utility model detects the liquid level in the drain tank in real time by setting a first preset voltage value corresponding to the warning liquid level. When it is detected that the liquid level reaches the warning liquid level, the speed of the inner fan or the outer fan of the parking air conditioner is promptly controlled according to the working mode of the parking air conditioner, so as to reduce the heat exchange of the parking air conditioner, thereby reducing the generation of condensed water, reducing the liquid inlet speed of the drain tank, and preventing the drain tank from overflowing or leaking.

[0073] Reference Figure 1 and Figure 8In one embodiment, the liquid level monitoring circuit 110 includes:

[0074] The output interface J1 has a power pin, an output pin and a ground pin, the power pin is used to connect to the first power source, and the ground pin is grounded;

[0075] Liquid level sensor;

[0076] The first resistor R1 is connected in series between the output end and the output pin of the liquid level sensor;

[0077] The second resistor R2 is connected in series between the output pin and the ground;

[0078] A first capacitor C1 is connected in series between the output end of the liquid level sensor and the ground;

[0079] The first electrostatic tube TZ1 has a cathode connected to a first power source, an anode connected to ground, and a third end of the first electrostatic tube TZ1 connected to the output pin.

[0080] In this embodiment, the liquid level sensor is a capacitive liquid sensor. When the liquid level monitoring circuit 110 is working, the liquid level sensor outputs a liquid level monitoring signal of a corresponding voltage value in real time according to its internal capacitance value, wherein the first capacitor C1 is used to filter the liquid level monitoring signal output by the liquid level sensor, and the first resistor R1 and the second resistor R2 form a voltage divider circuit to prevent the voltage value of the liquid level monitoring signal from exceeding the receiving threshold of the control chip 120 pin and causing damage to the pin. At the same time, the first electrostatic tube TZ1 is used to maintain voltage stability when the first power supply is powered to suppress surge interference.

[0081] Reference Figure 2 and Figure 3 In one embodiment, the first driving module 130 includes:

[0082] A first driving branch 131, wherein an input end of the first driving branch 131 is electrically connected to the control chip 120, and an output end of the first driving branch 131 is used to connect to the indoor fan, and is used to adjust the speed of the indoor fan according to the first adjustment signal;

[0083] The second driving branch 134 has an input end electrically connected to the control chip 120 , and an output end of the second driving branch 134 is used to connect to the external fan, and is used to adjust the rotation speed of the external fan according to the second adjustment signal.

[0084] Specifically, the first driving branch 131 includes:

[0085] A first intelligent power module 132, wherein a plurality of signal input terminals of the first intelligent power module 132 are electrically connected to the control chip 120, and a plurality of output terminals of the first intelligent power module 132 are used to connect to the internal fan;

[0086] A first current detection circuit 133, wherein an input end of the first current detection circuit 133 is connected to a current detection end of the first intelligent power module 132, and an output end of the first current detection circuit 133 is electrically connected to the control chip 120, for outputting a corresponding first current detection signal to the control chip 120;

[0087] The control chip 120 is further configured to adjust the multiple first control signals input to the first intelligent power module 132 according to the received first current detection signal.

[0088] In this embodiment, the first intelligent power module 132 includes Fig. 9 IPM1 in, with Fig. 9 The peripheral circuits in the system work together to realize the function of power control.

[0089] Taking the first driving branch 131 as an example, multiple output terminals of the first intelligent power module 132 are connected to the internal fan:

[0090] When the parking air conditioner is in cooling mode, the control chip 120 outputs a first speed adjustment signal to the first intelligent power module 132, driving the first intelligent power module 132 to reduce the speed of the internal fan. At the same time, the first intelligent power module 132 is provided with a speed feedback terminal for receiving the speed feedback signal output by the internal fan, so as to further adjust the internal fan according to the speed feedback signal until a preset first reference speed is reached.

[0091] The first current detection circuit 133 uses the first current detection signal output by the current detection terminal to detect any phase current of the internal fan, thereby realizing real-time monitoring of the bus current.

[0092] Since the fan is powered by direct current, the number of first current detection circuits 133 can vary with the number of direct current lines of the fan, and can be one or more.

[0093] Optional, such as Fig.10 As shown, the first current detection circuit 133 includes:

[0094] A first operational amplifier U1 has a first non-inverting input pin, a first inverting input pin and a first output pin;

[0095] A third resistor R3 and a fourth resistor R4, wherein the third resistor R3 is connected in series between the first inverting input pin and the ground, and the fourth resistor R4 is connected in series between the first inverting input pin and the first output pin;

[0096] a fifth resistor R5 and a sixth resistor R6, wherein a first end of the fifth resistor R5 is one of the input ends of the first current detection circuit, a second end of the fifth resistor R5 is respectively connected to the first positive phase input pin and the second end of the sixth resistor R6, and a first end of the sixth resistor R6 is used to connect to the first power supply;

[0097] a seventh resistor R7 and an eighth resistor R8, wherein a first end of the seventh resistor R7 is connected to the first output pin, a second end of the seventh resistor R7 is one of the output ends of the first current detection circuit, and the eighth resistor R8 is connected in series between the second end of the seventh resistor R7 and ground;

[0098] The second capacitor C2 is connected in parallel to two ends of the fourth resistor R4;

[0099] A third capacitor C3 is connected in series between the first positive phase input pin and the ground;

[0100] The fourth capacitor C4 is connected in parallel to both ends of the eighth resistor R8.

[0101] Reference Figure 4 In one embodiment, the parking air conditioner further includes a compressor, and the parking air conditioner control circuit further includes:

[0102] A second driving module 140, wherein a controlled end of the second driving module 140 is electrically connected to the control chip 120, and an output end of the second driving module 140 is used to connect to the compressor;

[0103] The control chip 120 is further configured to control the second driving module 140 to adjust the operating frequency of the compressor to a preset reference frequency when the voltage value of the received liquid level monitoring signal reaches a first preset voltage value.

[0104] It should be noted that the operating frequency of the compressor determines the flow rate of the refrigerant. The higher the operating frequency of the compressor, the higher the flow rate. Therefore, in order to avoid the air conditioner's high heat exchange capacity and the generation of more condensed water when the refrigerant flow rate is fast, a reference frequency is set in this embodiment. The reference frequency is a lower operating frequency within the normal working range of the compressor. For example, when the normal working range of the compressor is between 30 and 120 Hz, the reference frequency can be 30 Hz, 35 Hz, etc. This allows the compressor to be frequency-reduced to reduce the rate of condensed water generation when the liquid storage tank is clogged in the air conditioner.

[0105] Reference Figure 5 In one embodiment, the second driving module 140 includes:

[0106] A second intelligent power module 141, wherein a plurality of signal input terminals of the second intelligent power module 141 are electrically connected to the control chip 120, and a plurality of output terminals of the second intelligent power module 141 are used for outputting multi-phase alternating current in a one-to-one correspondence;

[0107] A second current detection circuit 142, wherein an input end of the second current detection circuit 142 is connected to a current detection end 141 of the second intelligent power module, and an output end of the second current detection circuit 142 is electrically connected to the control chip 120, for outputting a corresponding second current detection signal to the control chip 120;

[0108] The control chip 120 is further configured to adjust the multiple second control signals input to the second intelligent power module 141 according to the received second current detection signal.

[0109] In this embodiment, the second intelligent power module 141 includes Fig.11 IPM2 in, with Fig.12 The peripheral circuits in the system work together to realize the function of power control.

[0110] Optional, such as Fig.12 As shown, the second current detection circuit 142 includes:

[0111] The second operational amplifier U2 has a second non-inverting input pin, a second inverting input pin and a second output pin;

[0112] a ninth resistor R9 and a tenth resistor R10, wherein the ninth resistor R9 is connected in series between the second inverting input pin and the ground, and the tenth resistor R10 is connected in parallel between the second inverting input pin and the second output pin;

[0113] an eleventh resistor R11 and a twelfth resistor R12, wherein a first end of the eleventh resistor R11 is an input end of the second current detection circuit 142, a second end of the eleventh resistor R11 is respectively connected to the second positive phase input pin and a second end of the twelfth resistor R12, and a first end of the twelfth resistor R12 is used to connect to the first power supply;

[0114] A thirteenth resistor R13, a first end of the thirteenth resistor R13 is connected to the second output pin, and a second end of the thirteenth resistor R13 is an output end of the second current detection circuit 142;

[0115] a fifth capacitor C5 and a sixth capacitor C6, wherein the fifth capacitor C5 is connected in parallel to both ends of the ninth resistor R9, and the sixth capacitor C6 is connected in parallel to both ends of the tenth resistor R10;

[0116] A seventh capacitor C7, the seventh capacitor C7 is connected in series between the first non-inverting input terminal and the ground;

[0117] an eighth capacitor C8 connected in parallel to two ends of the twelfth resistor R12;

[0118] The ninth capacitor C9 is connected in series between the second end of the thirteenth resistor R13 and the ground.

[0119] Furthermore, the parking air conditioning control circuit also includes an overcurrent protection circuit 143, the input end of the overcurrent protection circuit 143 is connected to the current detection pin of the second intelligent power module 141, and the output end of the overcurrent protection circuit 143 is connected to the protection trigger end of the second intelligent power module 141, which is used to output a corresponding overcurrent protection signal when it is detected that the current value of the second intelligent power module 141 reaches a preset reference current value, so as to trigger the second intelligent power module 141 to stop working.

[0120] Alternatively, if Fig.13 As shown, the overcurrent protection circuit 143 includes:

[0121] The third operational amplifier U3 has a power pin, a ground pin, a third non-inverting input pin, a third inverting input pin and a third output pin, the power pin is used to connect to the first power supply, and the ground pin is grounded;

[0122] a fourteenth resistor R14, wherein a first end of the fourteenth resistor R14 is an input end of the overcurrent protection circuit 143, and a second end of the fourteenth resistor R14 is connected to the third inverting input pin;

[0123] a fifteenth resistor R15, a sixteenth resistor R16, and a seventeenth resistor R17, wherein a first end of the fifteenth resistor R15 is used to be connected to a first power supply, a second end of the fifteenth resistor R15 is respectively connected to a first end of the sixteenth resistor R16, a first end of the seventeenth resistor R17, and a third inverting input pin, and a second end of the sixteenth resistor R16 and a second end of the seventeenth resistor R17 are respectively grounded;

[0124] An eighteenth resistor R18 and a nineteenth resistor R19, wherein the first end of the eighteenth resistor R18 is used to connect to the first power supply, the second end of the eighteenth resistor R18 is respectively connected to the third output pin and the first end of the nineteenth resistor R19, and the second end of the nineteenth resistor R19 is the output end of the overcurrent protection circuit 143;

[0125] a second electrostatic tube TZ2, wherein the cathode of the second electrostatic tube TZ2 is used to be connected to the first power supply, the anode of the second electrostatic tube TZ2 is grounded, and the third end of the second electrostatic tube TZ2 is connected to the third positive phase input pin;

[0126] A tenth capacitor C10 is connected in series between the third non-inverting input pin and the ground;

[0127] an eleventh capacitor C11, connected in series between the third inverting input pin and ground;

[0128] The twelfth capacitor C12 is connected in series between the power pin and the ground;

[0129] The thirteenth capacitor C13 is connected in series between the second end of the thirteenth resistor R13 and the ground.

[0130] In this embodiment, the reference current value is the maximum critical value of the normal operating current range of the compressor. Generally speaking, the normal operating current range of household appliances is between 80% and 120% of its rated current. Therefore, when the rated current of the indoor fan is 4.5A, the maximum critical value can be 5.4A.

[0131] Reference Figure 6 In one embodiment, the parking air conditioning control circuit further includes:

[0132] A timer 150, the output end of which is electrically connected to the control chip 120, for timing after being triggered, and outputting a corresponding timing end signal after reaching a preset timing period;

[0133] The control chip 120 is also used to trigger the timer 150 to start timing when the voltage value of the connected liquid level monitoring signal reaches a first preset voltage value;

[0134] The control chip 120 is also used to control the second driving module 140 to stop driving the compressor and output corresponding alarm information when the timing end signal is received and the voltage value of the liquid level monitoring signal still reaches the first preset voltage value.

[0135] In this embodiment, in order to avoid the situation where condensed water is still generated and continues to accumulate when the water outlet of the drain tank is completely blocked, the utility model is also provided with a delayed detection function.

[0136] After the control chip 120 detects that the liquid level in the drain tank has reached the warning water level, the control timer 150 starts working to confirm whether the water level is a temporary fluctuation or a persistent problem after a preset timing period (such as a shorter time of 10 seconds, 15 seconds, etc.).

[0137] After the timer 150 ends, the control chip 120 receives the timing end signal output by the timer 150. If the control chip 120 detects that the liquid level in the drain tank still reaches the warning water level, the control chip 120 will output a warning message through interactive components such as the display screen and the host computer. The warning message will remind the user that the drain tank may be clogged and suggest the user to clean it in time so that the user can respond to the warning message in time and take corresponding cleaning measures. Furthermore, the control chip 120 can also take emergency measures such as automatic shutdown.

[0138] Reference Figure 7 , Fig.14 and Fig.15The utility model also provides a parking air conditioner, including a drain tank 200, an inner fan 300, an outer fan 400 and the above-mentioned parking air conditioner control circuit 100;

[0139] The parking air conditioning control circuit 100 is electrically connected to the interior fan 300 and the exterior fan 400 respectively;

[0140] The inner fan 300 includes a first condensate collecting pipe, and the outer fan includes a second condensate collecting pipe. Both the first condensate collecting pipe and the second condensate collecting pipe are connected to the drain tank 200 and liquid flows into the drain tank 200.

[0141] Specifically, two drain valves 210 are disposed at intervals at the bottom of the drain tank 200 , and each drain valve 210 is electrically connected to the parking air conditioning control circuit 100 ;

[0142] The parking air conditioning control circuit 100 is also used to control the two drain valves 210 to open simultaneously when the voltage value of the connected liquid level monitoring signal reaches a first preset voltage value, and to control any one of the drain valves 210 to open when the voltage value of the connected liquid level monitoring signal does not reach the first preset voltage value.

[0143] In this embodiment, under normal circumstances, the drain tank 200 can drain normally. When the voltage value of the liquid level monitoring signal is not detected to reach the preset voltage value, only one of the two drain valves 210 is opened, so that the drain tank 200 can drain normally. Once the voltage value of the liquid level monitoring signal reaches the first preset voltage value, the parking air conditioning control circuit 100 detects that the liquid level is close to the critical value. The parking air conditioning control circuit 100 will output a warning message and control the corresponding load module to work, and take corresponding measures, such as adjusting the drainage speed or starting the backup drainage path (that is, in this embodiment, the two drain valves 210 are controlled to be opened at the same time) to prevent the liquid level from exceeding the safety threshold.

[0144] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A parking air conditioner control circuit, the parking air conditioner comprising a drain tank, an inner fan and an outer fan, characterized in that: The parking air conditioning control circuit comprises: A liquid level monitoring circuit is arranged in the liquid drain tank, and is used to detect the liquid level in the liquid drain tank in real time and output a corresponding liquid level monitoring signal; a control chip, electrically connected to the output end of the liquid level monitoring circuit, and configured to output a first regulating signal if the parking air conditioner is in a cooling mode, and output a second regulating signal if the parking air conditioner is in a non-cooling mode, when the voltage value of the liquid level monitoring signal reaches a first preset voltage value; A first driving module, wherein a controlled end of the first driving module is electrically connected to the control chip, a first output end of the first driving module is used to connect to the internal fan, and a second output end of the first driving module is used to connect to the external fan; the first driving module is also used to reduce the rotation speed of the internal fan to a preset first reference rotation speed according to the first regulating signal, or to reduce the rotation speed of the external fan to a preset second reference rotation speed according to the second regulating signal.

2. The parking air conditioning control circuit according to claim 1, characterized in that: The liquid level monitoring circuit comprises: An output interface, comprising a power pin, an output pin and a ground pin, wherein the power pin is used to connect to a first power source, and the ground pin is grounded; Liquid level sensor; A first resistor, connected in series between the output end of the liquid level sensor and the output pin; A second resistor is connected in series between the output pin and the ground; A first capacitor connected in series between the output end of the liquid level sensor and the ground; A first electrostatic tube, wherein the cathode of the first electrostatic tube is used to connect to the first power supply, the anode of the first electrostatic tube is grounded, and the third end of the first electrostatic tube is connected to the output pin.

3. The parking air conditioning control circuit according to claim 1, characterized in that: The first driving module comprises: a first drive branch, wherein an input end of the first drive branch is electrically connected to the control chip, an output end of the first drive branch is used to connect to the indoor fan, and the first drive branch is further used to adjust the speed of the indoor fan according to the first adjustment signal; The second drive branch, the input end of the second drive branch is electrically connected to the control chip, the output end of the second drive branch is used to connect to the external fan, and the second drive branch is also used to adjust the speed of the external fan according to the second adjustment signal.

4. The parking air conditioning control circuit according to claim 3, characterized in that: The first driving branch comprises: a first intelligent power module, wherein a plurality of signal input terminals of the first intelligent power module are electrically connected to the control chip, and a plurality of output terminals of the first intelligent power module are used to connect to the internal fan; a first current detection circuit, wherein an input end of the first current detection circuit is connected to a current detection end of the first intelligent power module, and an output end of the first current detection circuit is electrically connected to the control chip, and is used to output a corresponding first current detection signal to the control chip; The control chip is further used to adjust the multiple first control signals input to the first intelligent power module according to the received first current detection signal.

5. The parking air conditioning control circuit according to claim 1, characterized in that: The parking air conditioner further includes a compressor, and the parking air conditioner control circuit further includes: A second driving module, wherein a controlled end of the second driving module is electrically connected to the control chip, and an output end of the second driving module is used to connect to the compressor; The control chip is also used to control the second driving module to adjust the operating frequency of the compressor to a preset reference frequency when the voltage value of the connected liquid level monitoring signal reaches a first preset voltage value.

6. The parking air conditioning control circuit according to claim 5, characterized in that: The second driving module comprises: a second intelligent power module, wherein a plurality of signal input terminals of the second intelligent power module are electrically connected to the control chip, and a plurality of output terminals of the second intelligent power module are used for outputting multi-phase alternating current in a one-to-one correspondence; a second current detection circuit, wherein an input end of the second current detection circuit is connected to a current detection end of the second intelligent power module, and an output end of the second current detection circuit is electrically connected to the control chip, and is used to output a corresponding second current detection signal to the control chip; The control chip is further used to adjust the multiple second control signals input to the second intelligent power module according to the received second current detection signal.

7. The parking air conditioning control circuit according to claim 6, characterized in that: The parking air conditioning control circuit also includes: An overcurrent protection circuit, wherein the input end of the overcurrent protection circuit is connected to the current detection pin of the second intelligent power module, and the output end of the overcurrent protection circuit is connected to the protection trigger end of the second intelligent power module, and is used to output a corresponding overcurrent protection signal when it is detected that the current value of the second intelligent power module reaches a preset reference current value, so as to trigger the second intelligent power module to stop working.

8. The parking air conditioning control circuit according to claim 5, characterized in that: The parking air conditioning control circuit also includes: A timer, the output end of which is electrically connected to the control chip, for timing after being triggered and outputting a corresponding timing end signal after reaching a preset timing period; The control chip is also used to trigger the timer to start timing when the voltage value of the connected liquid level monitoring signal reaches a first preset voltage value; and, It is also used to control the second driving module to stop driving the compressor and output corresponding alarm information when the timing end signal is received and the voltage value of the liquid level monitoring signal still reaches the first preset voltage value.

9. A parking air conditioner, characterized in that: It comprises a drain tank, an inner fan, an outer fan and a parking air conditioning control circuit as claimed in any one of claims 1 to 8; The parking air conditioning control circuit is electrically connected to the inner fan and the outer fan respectively; The inner fan includes a first condensate collecting pipe, and the outer fan includes a second condensate collecting pipe. The first condensate collecting pipe and the second condensate collecting pipe are both connected to the drainage trough and flow into the drainage trough.

10. The parking air conditioner according to claim 9, characterized in that: Two drain valves are also arranged at intervals at the bottom of the drain tank, and each of the drain valves is electrically connected to the parking air conditioning control circuit; The parking air conditioning control circuit is also used to control the two drain valves to open simultaneously when the voltage value of the connected liquid level monitoring signal reaches a first preset voltage value, and to control any one of the drain valves to open when the voltage value of the connected liquid level monitoring signal does not reach the first preset voltage value.

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