Current detection circuit, refrigerator and refrigerating system thereof

Abstract

The embodiment of the utility model provides a current detection circuit, a refrigerator and a refrigerating system of the refrigerator, and the current detection circuit comprises a connecting piece which is used for being connected with an electric valve; the acquisition module is connected with the connecting piece, and the acquisition module is used for detecting the working current of the electric valve when the electric valve is connected into the connecting piece; and the processing module is connected with the acquisition module, and the processing module is used for outputting the working state of the electrically operated valve and / or outputting the working state of the compressor according to the working current of the electrically operated valve. By detecting the working current of the electrically operated valve, the working state of the electrically operated valve and / or the compressor can be determined, so that the locked-rotor phenomenon of the electrically operated valve can be detected, and the influence on the working of the compressor is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of detection circuit, and particularly relates to a current detection circuit, a refrigerator and a refrigerating system thereof. BACKGROUND

[0002] In the refrigerating system of a refrigerator, with the increasing requirement of energy consumption, some refrigerators gradually introduce electric valves to regulate refrigerant. However, since the high-pressure and low-temperature refrigerant flows through the electric valve for a long time, the resistance of the internal elements of the electric valve becomes large, causing the stall phenomenon, and even affecting the operation of the compressor. CONTENT OF THE INVENTION

[0003] The application provides a current detection circuit, a refrigerator and a refrigerating system thereof to detect the stall phenomenon of the electric valve, thereby reducing the influence on the operation of the compressor.

[0004] In a first aspect, an embodiment of the application provides a current detection circuit applied to a refrigerating system of a refrigerator, wherein the refrigerating system of the refrigerator comprises an electric valve and a compressor; and the current detection circuit comprises:

[0005] a connecting piece configured to be connected with the electric valve;

[0006] a collection module connected with the connecting piece, wherein the collection module is configured to detect the working current of the electric valve when the electric valve is connected with the connecting piece;

[0007] a processing module connected with the collection module, wherein the processing module is configured to output the working state of the electric valve and / or the working state of the compressor according to the working current of the electric valve.

[0008] Optionally, the collection module comprises:

[0009] a collector, wherein a first input port and a second input port of the collector are connected with a first power supply, a third input port and a fourth input port of the collector are connected with the connecting piece, an output port of the collector is connected with the processing module, and a power supply port of the collector is connected with a second power supply.

[0010] Optionally, the collection module further comprises:

[0011] a first capacitor, wherein one end of the first capacitor is connected with the power supply port of the collector, and the other end of the first capacitor is grounded.

[0012] Optionally, the collection module further comprises:

[0013] a second capacitor, wherein one end of the second capacitor is connected with a filtering port of the collector, and the other end of the second capacitor is grounded.

[0014] Optionally, the processing module comprises:

[0015] a comparator, configured to output a comparison signal according to comparison between the working current of the electric valve and the current threshold value;

[0016] a processor, connected with the comparator, configured to output the working state of the electric valve and / or the working state of the compressor according to the comparison signal.

[0017] Optionally, the current threshold value ranges from 130 mA to 170 mA.

[0018] Optionally, the current detection circuit further comprises a driving module, connected with the connecting piece, configured to drive the electric valve to work when the electric valve is connected to the connecting piece.

[0019] Optionally, the first port of the connecting piece is connected with the acquisition module, and the second port, the third port, the fourth port and the fifth port of the connecting piece are all connected with the driving module.

[0020] In a second aspect, the embodiments of the present application further provide a refrigeration system of a refrigerator, comprising an electric valve, a compressor and the current detection circuit according to any one of the above.

[0021] In a third aspect, the embodiments of the present application further provide a refrigerator, comprising the refrigeration system of a refrigerator according to the above.

[0022] In the current detection circuit, the refrigerator and the refrigeration system thereof according to the embodiments of the present application, the working state of the electric valve and / or the compressor can be determined by detecting the working current of the electric valve, so that the locked-rotor phenomenon of the electric valve can be detected and the influence on the working of the compressor can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0024] In order to more completely understand the present application and its beneficial effects, the following will be described with reference to the drawings. In the following description, the same reference numerals represent the same parts.

[0025] Figure 1 A structural block diagram of the current detection circuit provided by the embodiments of the present application.

[0026] Figure 2 Another structural block diagram of the current detection circuit provided by the embodiments of the present application.

[0027] Figure 3 A circuit diagram of the current detection circuit provided by the embodiment of the present application.

[0028] Figure 4 Another structural block diagram of the current detection circuit provided by the embodiment of the present application. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work fall within the protection scope of the present application.

[0030] In order to monitor the stall condition of the electric valve and reduce the influence on the operation of the compressor, the embodiments of the present application provide a current detection circuit, a refrigerator and a refrigerating system thereof, which will be described below with reference to the drawings.

[0031] Please refer to Figure 1 , as shown in the figure, Figure 1 A structural block diagram of the current detection circuit provided by the embodiment of the present application. The embodiment of the present application provides a current detection circuit 100, which is applied to a refrigerating system of a refrigerator. The refrigerating system of the refrigerator at least includes an electric valve and a compressor. The compressor is an important component of the refrigerating system of the refrigerator. The compressor can compress refrigerant, that is, the compressor can compress the refrigerant vapor in a low pressure state to a high pressure state, so that it can be liquefied at room temperature in the condenser. In this process, the electric valve can be used to adjust the refrigerant flow, so as to control the refrigerating efficiency of the refrigerating system.

[0032] For example, the current detection circuit 100 includes a connecting piece 110, an acquisition module 120 and a processing module 130.

[0033] The connecting piece 110 can be understood as a connection interface. The connecting piece 110 is used to be connected with the electric valve.

[0034] The acquisition module 120 is connected with the connecting piece 110. The acquisition module 120 is used to detect the working current of the electric valve when the electric valve is connected to the connecting piece 110.

[0035] The processing module 130 is connected with the acquisition module 120. The processing module 130 is used to output the working state of the electric valve and / or the working state of the compressor according to the working current of the electric valve.

[0036] It should be noted that the working state of the electric valve, such as normal and abnormal, can be reflected in the working current of the electric valve, and thus the working state of the electric valve can be determined by detecting the working current of the electric valve. If the working state of the electric valve is abnormal, the working current of the electric valve will be different from the normal value, and at this time, the electric valve failure mainly has two kinds, one is the uncontrolled normally open state of the electric valve, and the other is the uncontrolled normally closed state of the electric valve.

[0037] On this basis, whether the refrigerant flows out of the pipeline behind the electric valve can be detected to determine the working state of the compressor. For example, when the working state of the electric valve is abnormal, and no refrigerant flows out of the pipeline behind the electric valve, it can be determined that the working state of the compressor is abnormal. In order to ensure the reliability of the detection of the working state of the compressor, the opening and closing state of the electric valve at this time can be further confirmed. When the electric valve is in the open state and no refrigerant flows out, it can be determined that the working state of the compressor is abnormal.

[0038] For example, if the electric valve is in the uncontrolled normally open state, the compressor can continuously output a large flow of refrigerant, and at this time, the power consumption of the compressor is high. By detecting whether the power consumption of the compressor fluctuates, on the basis that the power consumption of the compressor fluctuates little and the working state of the electric valve is abnormal, it can be determined that the working state of the compressor is a high-power consumption state.

[0039] The current detection circuit 100 provided by the embodiment of the present application can determine the working state of the electric valve and / or the compressor by detecting the working current of the electric valve, so that the stall phenomenon of the electric valve can be detected, and the influence on the working of the compressor can be reduced.

[0040] Please refer to Figure 2 and Figure 3 , Figure 2 is another structural block diagram of the current detection circuit provided by the embodiment of the present application, Figure 3 is a circuit diagram of the current detection circuit provided by the embodiment of the present application. For example, the current detection circuit 100 further includes a driving module 140, the driving module 140 is connected with the connecting piece 110, and the driving module 140 is used for driving the electric valve to work when the electric valve is connected with the connecting piece 110. For example, the driving module 140 can be understood as a structure composed of a single-chip microcomputer and its peripheral circuit, and the structural composition of the driving module 140 can be referred to Figure 3 , which will not be described here.

[0041] It should be noted that the electric valve can be two-phase four-wire, and the connecting piece 110 can have five ports or five interfaces. For example, please refer to Figure 3The first port of the connecting piece 110 is connected with the collecting module 120, and the second port, the third port, the fourth port and the fifth port of the connecting piece 110 are all connected with the driving module 140. Wherein, A, A / , B, B / are two coils.

[0042] Please continue to refer to Figure 3 For example, the collecting module 120 comprises a collector U23, which can be understood as a single-chip microcomputer or a direct current collecting chip. The first input port IP+ and the second input port IP+ of the collector U23 are connected with a first power supply, which can be 12V for example. The third input port IP- and the fourth input port IP- of the collector U23 are both connected with the connecting piece 110. The output port VIOUT of the collector U23 is connected with the processing module 130, the power supply port VCC of the collector U23 is connected with a second power supply, which can be 5V for example, and the ground port GND of the collector U23 is connected with the ground GND.

[0043] For example, the collecting module 120 further comprises a first capacitor C1 and a second capacitor C2. One end of the first capacitor C1 is connected with the power supply port VCC of the collector U23, and the other end of the first capacitor C1 is connected with the ground GND. One end of the second capacitor C2 is connected with the filter port FILTER of the collector U23, and the other end of the second capacitor C2 is connected with the ground port GND of the collector U23. The first capacitor C1 and the second capacitor C2 both have a filtering effect.

[0044] The collector U23 can collect an analog voltage, and the working current of the electric valve can be calculated through an equivalent resistor or a mapping relationship in the collector U23.

[0045] Please continue to refer to Figure 3 and refer to Figure 4 as shown, Figure 4 is another structural block diagram of the current detection circuit provided by the embodiment. For example, the processing module 130 comprises a comparator 132 and a processor 134. The comparator 132 is used for outputting a comparison signal according to the comparison between the working current of the electric valve and the current threshold. The comparison signal can be one of two instructions, such as 1 or 0. For example, the comparison signal is 1, which means that the working current of the electric valve is lower than the current threshold, and the comparison signal is 0, which means that the working current of the electric valve exceeds the current threshold. The processor 134 is connected with the comparator. The processor 134 is used for outputting the working state of the electric valve and / or the working state of the compressor according to the comparison signal. For example, when the comparison signal is 1, the processor 134 outputs that the working state of the electric valve is normal and / or the working state of the compressor is normal. For example, when the comparison signal is 0, the processor 134 outputs that the working state of the electric valve is abnormal and / or the working state of the compressor is abnormal.

[0046] It should be noted that through test statistics, the current of the electric valve during normal operation is in the range of 50-70 mA, such as 50 mA, 60 mA or 70 mA, and the normal operating current of the electric valve slightly fluctuates due to different working conditions. When the electric valve is blocked, the current increases to 130-170 mA, so the current threshold range can be determined as 130-170 mA.

[0047] For example, when the working current of the electric valve collected by the collection module 120 is 55 mA, the comparison signal of the comparator 132 with the current threshold is 1, and the processor 134 outputs that the working state of the electric valve is normal and / or that the working state of the compressor is normal.

[0048] For another example, when the working current of the electric valve collected by the collection module 120 is 155 mA and the current threshold is 130 mA, the comparison signal of the comparator 132 with the current threshold is 0, and the processor 134 outputs that the working state of the electric valve is abnormal and / or that the working state of the compressor is abnormal.

[0049] The embodiment of the present application utilizes the current detection circuit 100 to realize current detection of the electric valve of the refrigerator, without disassembling the refrigerator components, thereby reducing the detection cost and maintenance difficulty. At the same time, the electric valve fault and / or the compressor fault can be quickly and accurately diagnosed, which helps to improve the refrigeration efficiency and service life of the compressor.

[0050] The embodiment of the present application also provides a refrigeration system of a refrigerator, which comprises the current detection circuit, the compressor and the electric valve described above. Since the refrigeration system of the refrigerator adopts all the technical solutions of all the embodiments described above, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described here one by one.

[0051] The embodiment of the present application also provides a refrigerator, which comprises the refrigeration system described above. Since the refrigerator adopts all the technical solutions of all the embodiments described above, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described here one by one.

[0052] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0053] In the description of the present application, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more features.

[0054] The current detection circuit, the refrigerator and the refrigerating system provided by the embodiments of the present application are described in detail above, and the principles and implementation manners of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed, and the above description of the embodiments should not be understood as a limitation on the present application.

Claims

1. A current detection circuit applied to a refrigeration system of a refrigerator, the refrigeration system of the refrigerator comprising an electric valve and a compressor; characterized in that, The current detection circuit comprises: a connecting piece for connecting with the electric valve; a collecting module connected with the connecting piece, the collecting module being configured to detect the working current of the electric valve when the electric valve is connected to the connecting piece; a processing module connected with the collecting module, the processing module being configured to output the working state of the electric valve and / or the working state of the compressor according to the working current of the electric valve.

2. The current sense circuit of claim 1, wherein, The collecting module comprises: a collector, first and second input ports of the collector being connected to a first power supply, third and fourth input ports of the collector being connected to the connecting piece, an output port of the collector being connected to the processing module, and a power supply port of the collector being connected to a second power supply.

3. The current sense circuit of claim 2, wherein, The collecting module further comprises: a first capacitor, one end of the first capacitor being connected to the power supply port of the collector, and the other end of the first capacitor being grounded.

4. The current sense circuit of claim 2, wherein, The collecting module further comprises: a second capacitor, one end of the second capacitor being connected to the filter port of the collector, and the other end of the second capacitor being grounded.

5. The current sense circuit of claim 1, wherein, The processing module comprises: a comparator, the comparator being configured to output a comparison signal according to the comparison between the working current of the electric valve and a current threshold value; a processor connected with the comparator, the processor being configured to output the working state of the electric valve and / or the working state of the compressor according to the comparison signal.

6. The current sense circuit of claim 5, wherein, The current threshold value ranges from 130 mA to 170 mA.

7. The current sense circuit of claim 1, wherein, The current detection circuit further comprises a driving module connected with the connecting piece, the driving module being configured to drive the electric valve to work when the electric valve is connected to the connecting piece.

8. The current sense circuit of claim 7, wherein, First port of the connecting piece is connected with the collecting module, and second, third, fourth and fifth ports of the connecting piece are connected with the driving module.

9. A refrigeration system of a refrigerator, characterized by, A refrigeration system comprising an electric valve, a compressor and the current detection circuit according to any one of claims 1 to 8.

10. A refrigerator characterized by comprising: A refrigeration system comprising the refrigerator according to claim 9.

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