Air conditioning device

Abstract

The utility model discloses an air conditioning device which comprises a compressor power supply loop, a switch device, a pressure switch, a pressure switch response circuit, a switch device drive circuit and a compressor drive circuit. The switch device is used for connecting or disconnecting a power supply loop of the compressor; the pressure switch is used for detecting the pressure of the refrigerant pipeline and actuating the switch device; the pressure switch response circuit is used for receiving an action signal of the pressure switch and outputting a control signal to the compressor driving circuit and the switching device driving circuit; the switching device driving circuit comprises a power supply for supplying power to the switching device and an energy storage module, and the energy storage module supplies power when the power supply does not supply power to the switching device. The switch device can be ensured to be in zero-current cut-off without any impact, the switch device and the whole circuit are protected, and normal operation of the air conditioner device is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning devices, in particular to an air conditioning device with pressure protection. Background Art

[0002] During the operation of an air conditioner, due to factors such as harsh outdoor environment and system failures, the refrigerant pressure in the air conditioning system will abnormally increase. Generally, a pressure sensor is set to detect the system pressure in real time. On the one hand, the system is controlled by collecting real-time pressure data, and on the other hand, the frequency of the compressor is limited when the system pressure is too high. However, the pressure detection of the sensor has time lag, and instantaneous pressure shocks cannot be protected in time. At this time, a pressure switch needs to be added to the air conditioning system for protection against rapid pressure shocks. The pressure switch is an automatically resetable switch with a high-pressure action value and a low-pressure recovery value. When the pressure switch operates, it needs to quickly stop the compressor without the participation of software, cut off the source of the system pressure increase, and at the same time provide a fault signal to the system to enable the system to perform a series of fault logic processes. However, during the process of the pressure switch hard shutting down the operation of the compressor, most of the hardware circuits cut off the power supply circuit of the main switch coil, causing the main switch contacts to jump open, and thus powering off the air conditioning system. But this control method has the following serious problems:

[0003] 1. The main switch contacts arc, resulting in the burning of the main switch and even fire. Mainly at the moment when the main switch disconnects, the compressor is still working. It takes several milliseconds for the contacts to completely disconnect from contact. At this time, the large current generated by the operation of the compressor will cause the main switch contacts to arc and generate high temperature. In the light case, the contacts are burned, and in the heavy case, the switch catches fire.

[0004] 2. When the main power supply is cut off and the compressor is still running, it will quickly drain the energy stored in the capacitor on the DC bus, resulting in a power supply failure in the system, causing the system to restart and leading to user complaints.

[0005] The above information disclosed in this background art is only used to increase the understanding of the background art of this application. Therefore, it may include prior art that is not known to ordinary technicians in this field. Summary of the Invention

[0006] The utility model provides an air conditioning device, which solves the technical problem that when the pressure switch of the existing air conditioning device operates, the power supply is cut off but the compressor has not stopped running, resulting in a large current impact on the switching device of the circuit.

[0007] To achieve the above-mentioned utility model purpose, the utility model adopts the following technical solutions to be realized:

[0008] An air conditioning device, comprising:

[0009] A compressor power supply circuit;

[0010] A switching device for turning on or off the power supply circuit of a compressor;

[0011] A pressure switch for detecting the refrigerant pipeline pressure and actuating the switching device;

[0012] An air-conditioning device includes:

[0013] A pressure switch response circuit for receiving the action signal of the pressure switch and outputting a control signal to the compressor drive circuit and the switching device drive circuit;

[0014] The switching device drive circuit includes a power supply for supplying power to the switching device and an energy storage module, and the energy storage module supplies power when the power supply does not supply power to the switching device.

[0015] In some embodiments of the present application, the pressure switch response circuit includes a control chip, the action signal of the pressure switch is output to the control chip, and the control chip outputs a control signal to the compressor drive circuit and the switching device drive circuit.

[0016] In some embodiments of the present application, the pressure switch response circuit includes a filter circuit, and the action signal of the pressure switch is filtered by the filter circuit and then output to the control chip.

[0017] In some embodiments of the present application, the pressure switch response circuit includes a resistor R3 and a triode. The resistor R3 is connected to the pressure switch, the resistor R3 is connected to a high level, the pressure switch is grounded, the control chip and the base of the triode are connected between the resistor R3 and the pressure switch, the emitter of the triode is grounded, and the resistor R3 and the triode are configured to make the triode conduct when the pressure switch is off.

[0018] In some embodiments of the present application, the collector of the triode is connected to the control signal output pin of the control chip, and a current-limiting resistor R2 is connected between the control signal output pin of the control chip and the collector of the triode.

[0019] In some embodiments of the present application, the switching device includes an actuating part and an operating part, and the operating part is located in the compressor power supply circuit; the switching device drive circuit includes a power supply, an energy storage module and a switching module. The power supply supplies power to the actuating part of the switching device through the switching module, the energy storage module is connected across the actuating part to supply power to the actuating part, one end of the energy storage module is grounded, and the other end is connected to the switching module and the actuating part.

[0020] In some embodiments of the present application, the switch device driving circuit includes a freewheeling diode. The positive electrode of the freewheeling diode is connected to the energy storage module, and the negative electrode of the freewheeling diode is connected to the switch module and the actuating part.

[0021] In some embodiments of the present application, the compressor has a current sampling resistor, and the energy storage module is an energy storage capacitor connected in parallel with the current sampling resistor of the compressor.

[0022] In some embodiments of the present application, a pre-charge resistor R1 is connected in parallel with the actuating part of the switch device. The air-conditioning device includes a filter capacitor, and the pre-charge resistor R1 is used to limit the current for charging the filter capacitor.

[0023] In some embodiments of the present application, the maximum voltage of the energy storage module is less than the voltage of the power supply.

[0024] Compared with the prior art, the advantages and positive effects of the present utility model are as follows: An air-conditioning device includes a compressor power supply circuit, a switch device, a pressure switch, a pressure switch response circuit, a switch device driving circuit, and a compressor driving circuit. The switch device is used to turn on or off the compressor power supply circuit. The pressure switch is used to detect the refrigerant pipeline pressure and actuate the switch device. The pressure switch response circuit is used to receive the action signal of the pressure switch and output a control signal to the compressor driving circuit and the switch device driving circuit. The switch device driving circuit includes a power supply for supplying power to the switch device and an energy storage module, and the energy storage module supplies power when the power supply does not supply power to the switch device. After the pressure switch of the air-conditioning device trips, the compressor shuts down and the power supply for supplying power to the switch device is disconnected. The switch device is supplied power by the energy storage module, and the energy storage module causes the switch device to disconnect with a delay, that is, the disconnection of the switch device is later than the shutdown of the compressor. Therefore, it is ensured that the switch device is cut off with zero current and there is no impact, protecting the switch device and the entire circuit and ensuring the normal operation of the air-conditioning device.

[0025] After reading the specific embodiments of the present utility model in conjunction with the accompanying drawings, other features and advantages of the present utility model will become clearer. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other accompanying drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a circuit principle block diagram of an air-conditioning device according to an embodiment.

[0028] Figure 2 Circuit diagram of the power supply circuit for a compressor according to an embodiment.

[0029] Figure 3 Circuit diagram of the pressure switch response circuit according to an embodiment.

[0030] Figure 4 Principle block diagram of the driving circuit for a switching device according to an embodiment.

[0031] Figure 5 Principle block diagram of the driving circuit for a switching device according to an embodiment.

[0032] Figure 6 Circuit diagram of the driving circuit for a switching device according to an embodiment.

[0033] Figure 7 Circuit diagram of the driving circuit for a switching device according to another embodiment.

[0034] Figure 8 Circuit diagram of an air conditioner device according to an embodiment.

[0035] Figure 9 Circuit diagram of the pressure switch tripping in an air conditioner device according to an embodiment.

[0036] Figure 10 Timing diagram of the pressure switch operation actuating the switching device according to an embodiment. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0038] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0039] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "a plurality of" means two or more.

[0040] In the description of this application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In this utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0042] The following disclosure provides many different embodiments or examples for implementing different structures of this utility model. To simplify the disclosure of this utility model, components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit this utility model. In addition, this utility model may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or arrangements discussed. In addition, this utility model provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0043] The air conditioning device provided in this application performs the refrigeration cycle of the air conditioner by using a compressor, a condenser, a throttling device, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat the indoor space.

[0044] The low-temperature and low-pressure refrigerant enters the compressor, which compresses it into a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0045] The throttling device expands the high-temperature and high-pressure liquid-phase refrigerant formed by condensation in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the throttling device and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by using the latent heat of evaporation of the refrigerant for heat exchange with the material to be cooled. Throughout the cycle, the air conditioner can adjust the temperature of the indoor space.

[0046] The outdoor unit of the air conditioner refers to the part of the refrigeration cycle including the compressor and the outdoor heat exchanger. The indoor unit of the air conditioner includes the indoor heat exchanger, and the throttling device can be provided in the indoor unit or the outdoor unit.

[0047] The indoor heat exchanger and the outdoor heat exchanger serve as condensers or evaporators. When the indoor heat exchanger serves as a condenser, the air conditioner serves as a heater in the heating state. When the indoor heat exchanger serves as an evaporator, the air conditioner serves as a cooler in the cooling state.

[0048] The refrigerant circulation circuit of the air-conditioning device includes a compressor, an outdoor heat exchanger, a throttling element, and an indoor heat exchanger connected in sequence through refrigerant pipes.

[0049] In some embodiments, the air-conditioning device is provided with a four-way valve to adjust the air-conditioning device to be in a refrigeration mode or a heating mode through the four-way valve.

[0050] During the operation of the air-conditioning device, there is a certain pressure in the refrigerant pipes. In some abnormal situations, the refrigerant pressure in the refrigerant pipes will abnormally increase. Therefore, a pressure switch is generally set in the air-conditioning device to perform pressure protection through the pressure switch.

[0051] In some embodiments, the pressure switch is a high-pressure pressure switch, and the high-pressure pressure switch is set on the high-pressure side of the air-conditioning device.

[0052] The high-pressure pressure switch is an automatically resetable switch with a high-pressure action value and a low-pressure recovery value.

[0053] When the pressure on the high-pressure side exceeds the high-pressure action value of the high-pressure pressure switch, the high-pressure pressure switch trips, controlling the compressor to stop to cut off the source of the system pressure increase. At the same time, a fault signal is provided to the system to enable the system to perform a series of fault logic processing.

[0054] When the pressure on the high-pressure side is lower than the low-pressure recovery value, the high-pressure pressure switch closes and the system returns to normal.

[0055] In Figure 1 、 8 example, the air conditioner device includes: a compressor power supply circuit, a switching device K1, a pressure switch P, a pressure switch response circuit, a switching device drive circuit, and a compressor drive circuit.

[0056] The compressor power supply circuit is used to supply power to the compressor.

[0057] The switching device K1 is located in the compressor power supply circuit, and the switching device K1 is used to turn on or off the compressor power supply circuit.

[0058] The switching device K1 has a conducting state and a disconnecting state. When the switching device K1 is in the conducting state, the compressor power supply circuit supplies power to the compressor, and the compressor can be started. When the switching device K1 is in the disconnecting state, the compressor power supply circuit cuts off the power supply to the compressor, and the compressor stops.

[0059] The pressure switch P is used to detect the refrigerant pipeline pressure and actuate the switching device K1.

[0060] The pressure switch P is an automatically resetable switch, with a high-pressure action value and a low-pressure recovery value.

[0061] When the pressure on the high-pressure side exceeds the high-pressure action value of the pressure switch P, the pressure switch P trips, actuating the switching device K1 to disconnect, and the compressor power supply circuit is disconnected from the compressor.

[0062] When the pressure on the high-pressure side is lower than the low-pressure recovery value, the pressure switch P closes, actuating the switching device K1 to close, and the compressor power supply circuit is conducted with the compressor.

[0063] The pressure switch response circuit is used to receive the action signal of the pressure switch P and output a control signal to the compressor drive circuit and the switching device drive circuit.

[0064] The switching device drive circuit includes a power supply for supplying power to the switching device K1 and an energy storage module R; the energy storage module R supplies power when the power supply does not supply power to the switching device K1.

[0065] When the pressure switch P closes, the power supply supplies power to the switching device K1, and the switching device K1 conducts. When the pressure switch P trips, the power supply does not supply power to the switching device K1, and the energy storage module R supplies power to the switching device K1. The switching device K1 still remains in the conducting state. As the circuit discharges, the power of the energy storage module R is consumed, and it cannot supply power to the switching device K1, so the switching device K1 disconnects, and the compressor power supply circuit cannot supply power to the compressor. The energy storage module R can make the switching device K1 delay in disconnecting.

[0066] The compressor drive circuit is used to drive the compressor.

[0067] After the pressure switch P of the air conditioner unit trips, the compressor is shut down, the power supply for the switch device K1 is disconnected, and the switch device is powered by the energy storage module R. The energy storage module R causes the switch device K1 to disconnect with a time delay, that is, the disconnection of the switch device K1 is later than the shutdown of the compressor. Therefore, it is ensured that the switch device K1 is cut off with zero current and there is no impact, protecting the switch device K1 and the entire circuit and ensuring the normal operation of the air conditioner unit.

[0068] In Figure 2 the example of, the compressor power supply circuit includes an AC power supply, a rectification unit, a PFC power factor correction module, a filter capacitor, and a compressor drive circuit.

[0069] The switch device K1 is located in the compressor power supply circuit.

[0070] The switching part of the switch device K1 is located in the compressor power supply circuit.

[0071] The switching part of the switch device K1 is located on the live wire L connected to the AC power supply. It is used to control the on / off of the compressor.

[0072] After the live wire L and the neutral wire N of the AC power supply pass through the switching part of the switch device K1, they are converted into direct current by the rectification unit.

[0073] The compressor drive circuit is an IPM inverter circuit that converts direct current into alternating current to supply power to the compressor.

[0074] The rectification circuit, PFC power factor correction module, filter capacitor, and IPM inverter circuit are the basic units of the compressor power supply circuit.

[0075] A pre-charge resistor R1 is connected in parallel with the operating part of the switch device K1. The pre-charge resistor R1 is used to limit the current during the charging of the filter capacitor.

[0076] After the filter capacitor is fully charged, the operating part of the switch device K1 closes to bypass the pre-charge resistor R1, and no current flows through the pre-charge resistor R1 anymore.

[0077] In Figure 3 the example of, the pressure switch response circuit includes a control chip MCU. The action signal of the pressure switch P is output to the control chip MCU, and the control chip MCU outputs a control signal to the compressor drive circuit and the switch device drive circuit.

[0078] The pressure switch response circuit includes an RC filter circuit. The action signal of the pressure switch P is filtered by the RC filter circuit and then output to the control chip MCU.

[0079] The RC filter circuit includes a resistor R6 and a capacitor C1.

[0080] The pressure switch response circuit includes a resistor R3 and a triode Q1. The resistor R3 is connected to the pressure switch P, the other end of the resistor R3 is connected to the high level DC5V, and the other end of the pressure switch P is grounded.

[0081] A control chip MCU is connected between the resistor R3 and the pressure switch P.

[0082] The resistor R3 and the pressure switch P are connected to the control chip MCU through an RC filter circuit.

[0083] The resistor R3 and the pressure switch P are connected to the control chip MCU through a resistor R6, and a capacitor C1 is grounded between the resistor R6 and the control chip MCU.

[0084] The base b of the triode Q1 is connected between the resistor R3 and the pressure switch P. The emitter e of the triode Q1 is grounded. The resistor R3 and the triode Q1 are configured such that the triode Q1 conducts when the pressure switch P is off.

[0085] The collector c of the triode Q1 is connected to the control signal output pin of the control chip MCU, and a current limiting resistor R2 is connected between the control signal output pin of the control chip MCU and the collector c of the triode Q1.

[0086] In Figure 4 's example, the switch device K1 includes an actuating part and an operating part, and the operating part is located in the power supply circuit of the compressor.

[0087] The switch device drive circuit includes a power supply, an energy storage module R, and a switch module.

[0088] The power supply supplies power to the actuating part of the switch device K1 through the switch module. When the switch module is closed, the power supply can supply power to the actuating part of the switch device K1, and the actuating part of the switch device K1 is closed; when the switch module is off, the power supply cannot supply power to the actuating part of the switch device K1, and the operating part of the switch device K1 is off.

[0089] In some embodiments, the switch device K1 is a relay, the actuating part is a coil, and the operating part is a switch.

[0090] In Figure 5 、 6 、7's example, the switch module is a drive chip.

[0091] In some other examples, the switch module can also be a switch element with on and off functions.

[0092] In Figure 6 's example, the energy storage module R is connected across the two ends of the actuating part A1A2 of the switch device K1 to supply power to the actuating part A1A2. One end of the energy storage module R is grounded, and the other end is connected to the switch module (drive chip) and the actuating part of the switch device K1.

[0093] In Figure 7 the example of, the switch device driving circuit includes a freewheeling diode D1. The positive electrode of the freewheeling diode D1 is connected to the energy storage module R, the negative electrode of the freewheeling diode D1 is connected to the switch module (driving chip) and the end A1 of the actuating part, and the end A2 of the actuating part is grounded.

[0094] The compressor has a current sampling resistor, and the energy storage module R is an energy storage capacitor connected in parallel with the current sampling resistor of the compressor.

[0095] In some other embodiments, the energy storage module R can also be other energy storage elements.

[0096] The maximum voltage of the energy storage module R is less than the voltage of the power supply.

[0097] In some embodiments, the power supply is DC12V.

[0098] In Figure 8 the example of, when the pressure switch P of the air-conditioning system has no action: the pressure switch P is normally closed, the base b potential of the triode Q1 is 0V, this level is input to the detection port of the control chip MCU, and the control chip MCU normally detects a low level.

[0099] The triode Q1 is an NPN-type triode with built-in bias. The base b voltage of the triode Q1 is 0V, and the triode Q1 is not conducting. At this time, the control chip MCU outputs a control signal to the switch device driving circuit and the compressor driving circuit.

[0100] Normally, in order to increase the driving ability of the control chip MCU for the driving chip IC2, they are directly connected. After adding the triode Q1, a current-limiting resistor R2 needs to be added to prevent the output pin of the control chip MCU from being directly connected to the ground after the triode Q1 conducts. On the one hand, it is to prevent the output pin current from being too large and causing damage to the control chip MCU, and on the other hand, it is to prevent interference from being introduced.

[0101] After the pressure switch P of the air-conditioning device acts, it is cooperatively controlled through the switch device driving circuit. The key to the control is that before the compressor stops, the switch device K1 does not have a disconnection response according to its own current state before the current is greater than the threshold value, so as to prevent the problem of large current arcing.

[0102] When the pressure switch P trips, the voltage at the base b of the triode Q1 is obtained by the voltage division of R3 and the internal bias resistors R4 and R5 of the triode Q1. By selecting the specifications of the bias resistors of the triode Q1 and the minimum amplification factor, it is ensured that the triode Q1 can be saturated and turned on. In some embodiments, the resistor R3 is selected as 2KΩ, R4 as 10KΩ, R5 as 10KΩ, and the minimum amplification factor of the triode Q1 is 30. After matching, the triode Q1 operates in the saturation region, and the voltage Vce between the collector c and the emitter e is below 0.5V. Check Vce and the maximum turn-off voltage of the drive chip IC2 to ensure that Vce is below the maximum turn-off voltage of the drive chip IC2, reliably cut off the drive circuit signal, and ensure that the moving part of the switch device K1 is disconnected. At this time, the voltage at the base b of the triode Q1 is about 4.2V, and the control chip MCU normally recognizes it as a high level, detecting that the pressure switch P has tripped.

[0103] In Figure 10 the example, when the pressure switch P trips and is detected by the control chip MCU, the control chip MCU needs to perform a lock-stop control on the compressor, which can quickly respond to the fault signal and quickly lock-stop the operation of the compressor. While quickly locking it, ensure the reliability of the whole machine fault detection and there should be no misoperation. Due to the RC filter circuit at the port of the control chip MCU, there is a delay of about 0.2ms for the fault detection signal to reach the control chip MCU, and the control chip MCU judges the high-level signal of the pressure switch P. The total time required for the control chip MCU to lock-stop the compressor is 2.2ms. During this period, since the compressor is still running, there is a large current on the moving part of the switch device K1. The presence of the energy storage module R1 enables the moving part of the switch device K1 not to disconnect when the switch device K1 loses power, so as to avoid the problem of contact arcing caused by the large current passing through.

[0104] In order to ensure the delayed disconnection of the actuating part of the switch device K1, a energy storage module R and a freewheeling diode D1 are added to the actuating part of the switch device K1. The energy storage module R is directly related to the compressor current and can be a capacitor connected in parallel with the compressor sampling resistor. When the compressor is operating normally, the energy storage module R stores energy normally, and the voltage of the energy storage module R is directly proportional to the compressor current. It is necessary to control its maximum voltage at about DC10V, which is less than the drive power supply voltage DC12V of the switch device K1. Since the energy storage module R and the drive power supply of the switch module K1 are different, in order to prevent power breakdown, a freewheeling diode D1 needs to be added for isolation. After the coil of the switch module K1 loses power, the voltage of the coil of the switch module K1 drops rapidly. When it drops to the maximum voltage of the energy storage module R, the energy storage module R will start to supply power to the coil of the switch module K1. At this time, due to the protection of the freewheeling diode D1, the contacts of the switch module K1 do not disconnect. When the compressor lock-stop signal is transmitted to the compressor drive circuit, the compressor starts to stop running, the compressor current will decrease rapidly, and the voltage of the energy storage module R will also decrease synchronously. When it drops to a certain value, the magnetic force of the coil of the switch module K1 is insufficient, and the main contacts will be released. At this time, the compressor current is very small, and the current passing through the main contacts of the switch module K1 is also very small. At this time, disconnecting the main contacts of the switch module K1 will cause no arc damage. From the moment the pressure switch P trips to the moment when the contacts of the switch module K1 are completely disconnected, it takes about 3ms.

[0105] The air-conditioning system locks the compressor about 2.2ms after the pressure switch P trips, and synchronously locks the control signal of the switch device K1, reporting a fault. The switch device K1 cuts off the main power supply 3ms after the pressure switch P trips, and the bypass resistor R1 starts to supply power to the filter capacitor. At this time, the air-conditioning system only consumes standby power, and the current is very small, without any impact on the resistor R1. The circuit state at this time is as Figure 9 shown.

[0106] When the pressure of the air-conditioning system returns to normal and the pressure switch P closes, the system enters the normal control mode and the switch device K1 is pulled in again.

[0107] By setting the pressure switch response circuit and the switch device drive circuit, the air-conditioning device ensures that after the pressure switch trips, the compressor can respond quickly, shut down the compressor in the shortest time, and before the compressor shuts down, the hardware circuit ensures that the switch device trips with a delay. After the compressor stops, the switch device then connects and disconnects. At this time, the switch device cuts off the current at zero, without any impact.

[0108] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any one or more embodiments or examples in a suitable manner.

[0109] The above are only the specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. An air conditioning device, comprising: Compressor power supply circuit; A switch device, used to turn on or off the compressor power supply circuit; Pressure switch, used to detect the refrigerant pipeline pressure and actuate the switch device; The air conditioning device is characterized in that: A pressure switch response circuit, for receiving an action signal of the pressure switch and outputting a control signal to a compressor drive circuit and a switch device drive circuit; The switch device driving circuit includes a power supply and an energy storage module for supplying power to the switch device. The energy storage module supplies power when the power supply does not supply power to the switch device.

2. The air conditioning device according to claim 1, characterized in that: The pressure switch response circuit includes a control chip, the action signal of the pressure switch is output to the control chip, and the control chip outputs a control signal to the compressor drive circuit and the switch device drive circuit.

3. The air conditioning device according to claim 2, characterized in that: The pressure switch response circuit includes a filter circuit, and the action signal of the pressure switch is filtered by the filter circuit and then output to the control chip.

4. The air conditioning device according to claim 2, characterized in that: The pressure switch response circuit includes a resistor R3 and a transistor, the resistor R3 is connected to the pressure switch, the resistor R3 is connected to a high level, the pressure switch is grounded, the control chip and the base of the transistor are connected between the resistor R3 and the pressure switch, the emitter of the transistor is grounded, and the resistor R3 and the transistor are configured so that the transistor is turned on when the pressure switch is disconnected.

5. The air conditioning device according to claim 4, characterized in that: The collector of the transistor is connected to the control signal output pin of the control chip, and a current-limiting resistor R2 is connected between the control signal output pin of the control chip and the collector of the transistor.

6. The air conditioning device according to claim 1, characterized in that: The switch device includes an actuating part and an action part, and the action part is located in the compressor power supply circuit; the switch device driving circuit includes a power supply, an energy storage module and a switch module, the power supply supplies power to the actuating part of the switch device through the switch module, the energy storage module is connected to both ends of the actuating part to supply power to the actuating part, one end of the energy storage module is grounded, and the other end is connected to the switch module and the actuating part.

7. The air conditioning device according to claim 6, characterized in that: The switch device driving circuit comprises a freewheeling diode, the positive electrode of the freewheeling diode is connected to the energy storage module, and the negative electrode of the freewheeling diode is connected to the switch module and the actuating part.

8. The air conditioning device according to claim 6, characterized in that: The compressor has a current sampling resistor, and the energy storage module is an energy storage capacitor connected in parallel to the current sampling resistor of the compressor.

9. The air conditioning device according to claim 6, characterized in that: The action part of the switch device is connected in parallel with a pre-charging resistor R1, the air conditioning device includes a filter capacitor, and the pre-charging resistor R1 is used to charge the filter capacitor to limit the current.

10. The air conditioning device according to claim 1, characterized in that: The maximum voltage of the energy storage module is lower than the voltage of the power supply.

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