Anti-surge circuit and air conditioner

Abstract

The utility model discloses an anti-surge circuit and an air conditioner. The anti-surge circuit comprises a control unit; at least one main unit containing a transient voltage suppressor; a gas discharge tube is arranged in the first auxiliary unit; a transient suppression diode and a gas discharge tube are arranged in the second auxiliary unit; the control unit is respectively connected with each main unit, each first auxiliary unit and each second auxiliary unit, and the control unit is used for controlling the on-off of the main units, the first auxiliary units and the second auxiliary units. According to the utility model, when the surge voltage phenomenon occurs, the control unit controls the conduction of the main unit, the first auxiliary unit and the second auxiliary unit in turn, thereby effectively preventing the temperature rise of components in the main unit, the first auxiliary unit or the second auxiliary unit from exceeding the standard due to too frequent discharge, and preventing the components from being damaged due to fatigue.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a surge protection circuit and an air conditioner. Background Art

[0002] When a circuit is struck by lightning or when inductive loads or large loads are connected or disconnected, very high operating overvoltages often occur. This instantaneous overvoltage (or overcurrent) is called surge voltage (or surge current), which is a transient interference phenomenon.

[0003] The surge voltage phenomenon will seriously endanger the safe operation of automation equipment. Therefore, eliminating surge noise interference and preventing surge damage have always been the core issues related to the safe and reliable operation of automation equipment.

[0004] At present, the main measure for traditional electrical equipment to deal with the surge voltage phenomenon is to increase varistors. By using the special non-linear characteristics of varistors, when an overvoltage appears, the voltage can be clamped to a relatively fixed voltage value, thereby protecting the subsequent circuit.

[0005] However, due to frequent extreme weather conditions, the surge voltage phenomenon is more frequent and intense. Traditional varistor protection measures may not meet the requirements, resulting in the intensity and frequency of surge voltage possibly exceeding the anti-surge limit tolerance of the equipment, leading to equipment damage or failure. Summary of the Utility Model

[0006] In view of this, the utility model provides a surge protection circuit and an air conditioner, which are used to solve the problem that the traditional varistor protection measures in the prior art cannot meet the requirement of resisting more frequent and intense surge voltage phenomena, resulting in equipment damage or failure.

[0007] The technical solution of the utility model is a surge protection circuit, including:

[0008] A control unit;

[0009] At least one main unit, which contains transient voltage suppressor diodes;

[0010] At least one first auxiliary unit, which contains gas discharge tubes;

[0011] At least one second auxiliary unit, which contains transient voltage suppressor diodes and gas discharge tubes;

[0012] The control unit is respectively connected to each main unit, each first auxiliary unit and each second auxiliary unit, and the control unit is used to control the on-off of the main unit, the first auxiliary unit and the second auxiliary unit.

[0013] Further, each of the main units includes a first relay, a first varistor, and a first transient suppression diode;

[0014] The second pin of the first relay is connected to the input end of the control unit, the third pin of the first relay is connected to the first end of the first varistor, the second end of the first varistor is connected to the first end of the first transient suppression diode, and the second end of the first transient suppression diode is grounded;

[0015] The first pin of the first relay is connected to the first output end of the control unit, and the fourth pin of the first relay is connected to the second output end of the control unit.

[0016] Further, each of the first auxiliary units includes a second relay, a second varistor, and a first gas discharge tube;

[0017] The second pin of the second relay is connected to the input end of the control unit, the third pin of the second relay is connected to the first end of the second varistor, the second end of the second varistor is connected to the first end of the first gas discharge tube, and the second end of the first gas discharge tube is grounded;

[0018] The first pin of the second relay is connected to the first output end of the control unit, and the fourth pin of the second relay is connected to the second output end of the control unit.

[0019] Further, each of the second auxiliary units includes a third relay, a third varistor, a second transient suppression diode, and a second gas discharge tube;

[0020] The second pin of the third relay is connected to the input end of the control unit, the third pin of the third relay is connected to the first end of the third varistor, the second end of the third varistor is connected to the first end of the second transient suppression diode, the second end of the second transient suppression diode is connected to the first end of the second gas discharge tube, and the second end of the second gas discharge tube is grounded;

[0021] The first pin of the third relay is connected to the first output end of the control unit, and the fourth pin of the third relay is connected to the second output end of the control unit.

[0022] Further, the control unit includes an analysis unit for recording the peak value and frequency of the surge current;

[0023] When both the peak value and frequency of the surge current do not exceed the preset peak limit value and preset frequency limit value, the control unit does not trigger the response action of the surge protection circuit.

[0024] Further, the preset peak limit value is 10,000 A, and the preset frequency limit value is 5 cph.

[0025] Further, the transient suppression diode is a unidirectional transient suppression diode or a bidirectional transient suppression diode.

[0026] Further, the first relay, the second relay, or the third relay is a single-pole single-throw relay.

[0027] Further, the first varistor, the second varistor, or the third varistor is any one of a metal oxide varistor, a silicon carbide varistor, a germanium varistor, or a silicon varistor.

[0028] The present utility model also provides an air conditioner, including the above-mentioned surge protection circuit.

[0029] Compared with the prior art, the present utility model has at least the following beneficial effects:

[0030] When the present utility model encounters a surge voltage phenomenon, the control unit alternately controls the conduction of the main unit, the first auxiliary unit, and the second auxiliary unit, effectively avoiding the over-temperature of the components in the main unit, the first auxiliary unit, or the second auxiliary unit due to overly frequent discharge, and the fatigue of the components and thus the occurrence of damage; the control unit can also control the full conduction of the main unit, the first auxiliary unit, and the second auxiliary unit to shunt the surge energy and avoid the damage of the components in the circuit by excessive surge energy. Description of the Drawings

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit the present utility model; the terms "including" and "having" and any variations thereof in the specification and claims of the present utility model and the above description of the drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of the present utility model or the above drawings are used to distinguish different objects and not to describe a specific order.

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1Schematic diagram of a surge protection circuit proposed by the present utility model;

[0034] Figure 2 Schematic diagram of another surge protection circuit proposed by the present utility model;

[0035] Figure 3 Schematic diagram of yet another surge protection circuit proposed by the present utility model.

[0036] Reference numerals:

[0037] 10. Control unit;

[0038] 11. Analysis unit;

[0039] 12. Control chip;

[0040] 13. Isolation unit;

[0041] 20. Main unit;

[0042] 21. Main unit A;

[0043] 22. Main unit B;

[0044] 30. First auxiliary unit;

[0045] 31. First auxiliary unit A;

[0046] 32. First auxiliary unit B;

[0047] 40. Second auxiliary unit;

[0048] 41. Second auxiliary unit A;

[0049] 42. Second auxiliary unit B. Detailed implementation mode

[0050] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. Thus, a feature pointed out in this specification will be used to illustrate one feature of one embodiment of the present utility model, rather than implying that each embodiment of the present utility model must have the feature described. In addition, it should be noted that this specification describes many features. Although some features may be combined together to show possible system designs, these features may also be used in other combinations not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0051] The principle and structure of the present utility model will be described in detail below with reference to the accompanying drawings and embodiments. Example 1

[0052] To cope with frequent extreme weather, which leads to more frequent and intense surge voltage phenomena, so as to ensure that the intensity and frequency of surge voltage do not exceed the anti-surge limit bearing capacity of the device and prevent device damage or failure. Referring to the appendix Figure 1 , the present utility model proposes a surge protection circuit, including: a control unit 10;

[0053] At least one main unit 20, which contains a varistor and a transient suppression diode;

[0054] At least one first auxiliary unit 30, which contains a varistor and a gas discharge tube;

[0055] At least one second auxiliary unit 40, which contains a varistor, a transient suppression diode and a gas discharge tube;

[0056] The control unit 10 is electrically connected to each main unit 20, each first auxiliary unit 30 and each second auxiliary unit 40 respectively, and the control unit 10 is used to control the on-off of the main unit 20, the first auxiliary unit 30 and the second auxiliary unit 40.

[0057] In this way, when the surge protection circuit is powered on and started, by default, only one main unit 20 is in the conducting state, and the remaining main units 20, first auxiliary units 30 and second auxiliary units 40 are all in the off state.

[0058] When the surge protection circuit encounters a surge voltage phenomenon, in order to conveniently record the peak value and frequency of the surge current borne by the circuit (this frequency refers to the number of surges suffered within one hour, the same throughout the text), an analysis unit 11 and a control chip 12 are provided in the control unit 10. In this way, when the analysis unit 11 detects a surge signal of the surge voltage phenomenon, the analysis unit 11 will start to record the current peak value and frequency, and upload the recorded data to the control chip 12, and then the control chip 12 will compare the received recorded data with the preset peak value limit and preset frequency limit set in advance.

[0059] When both the recorded peak current and frequency are not greater than the preset peak limit value and the preset frequency limit value, the control chip 12 does not trigger the response action of the surge protection circuit. At this time, the control chip 12 operates according to the default situation, that is, only the conducting main unit 20 is used to normally discharge the surge energy. When the recorded frequency is greater than the preset frequency limit value, starting from the first time the circuit suffers from a surge voltage phenomenon, the control chip 12 will receive the circuit frequency recorded by the analysis unit 11 again every preset time. If it is still greater than the preset frequency limit value, the control chip 12 will alternately control the conduction of the main unit 20, the first auxiliary unit 30, and the second auxiliary unit 40, effectively avoiding the over-temperature of the components in the main unit 20, the first auxiliary unit 30, or the second auxiliary unit 40 due to overly frequent discharge, and the fatigue of the components, thus avoiding damage, and improving the survival rate of electrical equipment equipped with a surge protection circuit in extremely harsh weather conditions.

[0060] It should be noted that the preset time in this embodiment is preferably 1 hour. Of course, the value of the preset time can also be selected according to the actual situation, and no limitation is made here.

[0061] Moreover, the control chip 12 alternately controlling the conduction of the main unit 20, the first auxiliary unit 30, and the second auxiliary unit 40 means that the control chip 12 only conducts one main unit 20 or one first auxiliary unit 30 or one second auxiliary unit 40 each time, while the remaining main unit 20, first auxiliary unit 30, and second auxiliary unit 40 are all in the off state.

[0062] For the sake of easy understanding and to prevent the fatigue of the components in the circuit and extend the service life of the components, the preset peak limit value is preferably 10000A, and the preset frequency limit value is preferably 5cph. Of course, the preset peak limit value and the preset frequency limit value can also be selected according to the actual situation, and no limitation is made here.

[0063] It should be noted that 5cph represents that the number of surges suffered within one hour is 5 times.

[0064] Among them, for the sake of easy understanding, referring to the attached Figure 2 , this embodiment takes one main unit 20, one first auxiliary unit 30, and one second auxiliary unit 40 as an example for illustration.

[0065] To clearly understand how the main unit 20 can better discharge the surge energy when encountering a surge voltage phenomenon, this embodiment proposes a circuit structure of the main unit 20. The main unit 20 includes a first relay K1, a first varistor MOV1, and a first transient suppression diode TVS1.

[0066] The second pin of the first relay K1 is connected to the input terminal of the control unit 10. The third pin of the first relay K1 is connected to the first end of the first varistor MOV1. The second end of the first varistor MOV1 is connected to the first end of the first transient voltage suppressor diode TVS1. The second end of the first transient voltage suppressor diode TVS1 is grounded.

[0067] The first pin of the first relay K1 is connected to the first output terminal of the control unit 10. The fourth pin of the first relay K1 is connected to the second output terminal of the control unit 10.

[0068] To clearly understand that when the first auxiliary unit 30 encounters a surge voltage phenomenon, it can better discharge the surge energy and is different from the circuit structure of the main circuit 20, this embodiment proposes a circuit structure of the first auxiliary unit 30. The first auxiliary unit 30 includes a second relay K2, a second varistor MOV2, and a first gas discharge tube GOT1.

[0069] The second pin of the second relay K2 is connected to the input terminal of the control unit 10. The third pin of the second relay K2 is connected to the first end of the second varistor MOV2. The second end of the second varistor MOV2 is connected to the first end of the first gas discharge tube GOT1. The second end of the first gas discharge tube GOT1 is grounded.

[0070] The first pin of the second relay K2 is connected to the first output terminal of the control unit 10. The fourth pin of the second relay K2 is connected to the second output terminal of the control unit 10.

[0071] To clearly understand that when the second auxiliary unit 40 encounters a surge voltage phenomenon, it can better discharge the surge energy and is different from the circuit structures of the main circuit 20 and the first auxiliary unit 30, this embodiment proposes a circuit structure of the second auxiliary unit 40. The second auxiliary unit 40 includes a third relay K3, a third varistor MOV3, a second transient voltage suppressor diode TVS2, and a second gas discharge tube GOT2.

[0072] The second pin of the third relay K3 is connected to the input terminal of the control unit 10. The third pin of the third relay K3 is connected to the first end of the third varistor MOV3. The second end of the third varistor MOV3 is connected to the first end of the second transient voltage suppressor diode TVS2. The second end of the second transient voltage suppressor diode TVS2 is connected to the first end of the second gas discharge tube GOT2. The second end of the second gas discharge tube GOT2 is grounded;

[0073] The first pin of the third relay K3 is connected to the first output terminal of the control unit 10. The fourth pin of the third relay K3 is connected to the second output terminal of the control unit 10.

[0074] It should be noted that the first relay K1, the second relay K2, and the third relay K3 in this embodiment are all four-pin relays, and pins 1 and 4 are the coil pins of the relay, while pins 2 and 3 are the switch contacts.

[0075] Specifically, when the surge protection circuit is powered on and starts up, by default, the first relay K1 is in the conducting state, while the second relay K2 and the third relay K3 are both in the off state.

[0076] It should be noted that the main unit 20, the first auxiliary unit 30, and the second auxiliary unit 40 in this embodiment adopt different component combinations to fully utilize the characteristics of different component combinations to absorb surge energy.

[0077] When the surge protection circuit encounters a surge voltage phenomenon and the analysis unit 11 detects a surge signal, the analysis unit 11 will start to record the peak value and frequency of the surge current borne by the main unit 20, and upload the recorded data to the control chip 12 of the control unit 10. Then, the control chip 12 will compare the recorded data with the preset peak value limit and preset frequency limit set in advance.

[0078] If both the recorded peak value and frequency of the surge current are not greater than the preset peak value limit and preset frequency limit, the control chip 12 will not work. At this time, the surge energy of the surge voltage phenomenon will only be normally discharged through the first varistor MOV1 and the first transient voltage suppressor TVS1 of the main unit 20.

[0079] If the recorded frequency is greater than the preset frequency limit value, then one hour after the first surge is suffered, the control chip 12 will control the second relay K2 of the first auxiliary unit 30 to conduct, and then disconnect the first relay K1 of the main unit 20. At this time, the surge energy will only be discharged through the second varistor MOV2 and the first gas discharge tube GOT1 of the first auxiliary unit 30. If after another hour, the frequency recorded by the analysis unit 11 is still greater than the preset frequency limit value, then the control chip 12 will control the third relay K3 of the second auxiliary unit 40 to conduct, and then disconnect the second relay K2 of the first auxiliary unit 30. At this time, the surge energy will only be discharged through the third varistor MOV3, the second transient suppression diode TVS2 and the second gas discharge tube GOT2 of the second auxiliary unit 40. If after another hour, the frequency recorded by the analysis unit 11 is still greater than the preset frequency limit value, then the control chip 12 will control the first relay K1 of the main unit 20 to conduct, and then disconnect the third relay K3 of the second auxiliary unit 40. At this time, the surge energy will be discharged through the first varistor MOV1 and the first transient suppression diode TVS1 of the main unit 20. By controlling the conduction of the main unit 20, the first auxiliary unit 30 and the second auxiliary unit 40 in turn, it effectively avoids the components in the main unit 20, the first auxiliary unit 30 or the second auxiliary unit 40 from exceeding the temperature rise standard due to too frequent discharge, and the components are fatigued and then damaged.

[0080] If the recorded peak value of the surge current is greater than the preset peak value limit, then on the basis of the first relay K1 of the main unit 20 being conducted, the control chip 12 will further control the second relay K2 of the first auxiliary unit 30 to conduct and the third relay K3 of the second auxiliary unit 40 to conduct, so as to conduct the main unit 20, the first auxiliary unit 30 and the second auxiliary unit 40 at the same time, and then shunt the surge energy to avoid the situation that the components in the circuit are damaged by too large surge energy.

[0081] If both the recorded peak value of the surge current and the frequency are greater than the preset peak value limit and the preset frequency limit, then the control chip 12 still conducts the first relay K1, the second relay K2 and the third relay K3 at the same time, and then shunts the surge energy to avoid the situation that the components in the circuit are damaged by too large surge energy.

[0082] If the analysis unit 11 does not detect a surge signal within twelve hours, the control chip 12 will restore the circuit to the default state, that is, only the first relay K1 is conducted, and the second relay K2 and the third relay K3 are disconnected, so as to minimize the leakage current of the circuit without encountering surge voltage, thereby reducing the loss and reducing the electric shock hazard at the same time.

[0083] Among them, the transient suppression diode is a unidirectional transient suppression diode or a bidirectional transient suppression diode.

[0084] For the main unit 20 and the second auxiliary unit 40 to better discharge surge energy, the first transient voltage suppression diode TVS1 and the second transient voltage suppression diode TVS2 in this embodiment are both unidirectional transient voltage suppression diodes.

[0085] Among them, for the main control chip 12 to control the on / off of the main unit 20, the first auxiliary unit 30 and the second auxiliary unit 40 through relays, the first relay K1, the second relay K2 and the third relay K3 are all single-pole single-throw relays.

[0086] Among them, the first varistor MOV1, the second varistor MOV2 or the third varistor MOV3 is any one of a metal oxide varistor, a silicon carbide varistor, a germanium varistor or a silicon varistor.

[0087] For the main unit 20, the first auxiliary unit 30 and the second auxiliary unit 40 to better discharge surge energy, the first varistor MOV1, the second varistor MOV2 and the third varistor MOV3 in this embodiment are all metal oxide varistors. Because the metal oxide varistor has the characteristics of fast response speed, large voltage coefficient and small resistance temperature coefficient, it can better discharge surge energy. Embodiment 2

[0088] Referring to the attached Figure 3 , the present utility model also proposes a surge protection circuit, including: a control unit 10 and a main unit A21, a main unit B22, a first auxiliary unit A31, a first auxiliary unit B32, a second auxiliary unit A41 and a second auxiliary unit B42 electrically connected to the control unit 10; and an analysis unit 11 and a control chip 12 are provided in the control unit 10.

[0089] Among them, the main unit A21 includes a first relay KA1, a first varistor MOVA1 and a first transient voltage suppression diode TVSA1; the main unit B22 includes a first relay KB1, a first varistor MOVB1 and a first transient voltage suppression diode TVSB1; the first auxiliary unit A31 includes a second relay KA2, a second varistor MOVA2 and a first gas discharge tube GOTA1; the first auxiliary unit B32 includes a second relay KB2, a second varistor MOVB2 and a first gas discharge tube GOTB1; the second auxiliary unit A41 includes a third relay KA3, a third varistor MOVA3, a second transient voltage suppression diode TVSA2 and a second gas discharge tube GOTA2; the second auxiliary unit B42 includes a third relay KB3, a third varistor MOVB3, a second transient voltage suppression diode TVSB2 and a second gas discharge tube GOTB2.

[0090] The second pins of the first relay KA1, the first relay KB1, the second relay KA2, the second relay KB2, the third relay KA3, and the third relay KB3 are all connected to the input terminal of the control unit 10.

[0091] The third pin of the first relay KA1 is connected to the first end of the first varistor MOVA1, and the second end of the first varistor MOVA1 is connected to the first end of the first transient suppression diode TVSA1; the third pin of the first relay KB1 is connected to the first end of the first varistor MOVB1, and the second end of the first varistor MOVB1 is connected to the first end of the first transient suppression diode TVSB1.

[0092] The third pin of the second relay KA2 is connected to the first end of the second varistor MOVA2, and the second end of the second varistor MOVA2 is connected to the first end of the first gas discharge tube GOTA1; the third pin of the second relay KB2 is connected to the first end of the second varistor MOVB2, and the second end of the second varistor MOVB2 is connected to the first end of the first gas discharge tube GOTB1.

[0093] The third pin of the third relay KA3 is connected to the first end of the third varistor MOVA3, and the second end of the third varistor MOVA3 is connected to the first end of the second transient suppression diode TVSA2. The second end of the second transient suppression diode TVSA2 is connected to the first end of the second gas discharge tube GOTA2; the third pin of the third relay KB3 is connected to the first end of the third varistor MOVB3, and the second end of the third varistor MOVB3 is connected to the first end of the second transient suppression diode TVSB2. The second end of the second transient suppression diode TVSB2 is connected to the first end of the second gas discharge tube GOTB2.

[0094] The second ends of the first transient suppression diode TVSA1, the first transient suppression diode TVSB1, the first gas discharge tube GOTA1, the first gas discharge tube GOTB1, the second gas discharge tube GOTA2, and the second gas discharge tube GOTB2 are all grounded.

[0095] The first pins of the first relay KA1, the first relay KB1, the second relay KA2, the second relay KB2, the third relay KA3, and the third relay KB3 are all connected to the first output terminal of the control unit 10.

[0096] The fourth pins of the first relay KA1, the first relay KB1, the second relay KA2, the second relay KB2, the third relay KA3, and the third relay KB3 are all connected to the second output terminal of the control unit 10.

[0097] It should be noted that the first relay KA1, the first relay KB1, the second relay KA2, the second relay KB2, the third relay KA3, and the third relay KB3 in this embodiment are all four-pin relays, and pins 1 and 4 are the coil pins of the relays, while pins 2 and 3 are the switch contacts of the relays.

[0098] Specifically, when the surge protection circuit is powered on and starts up, by default, the first relay KA1 is in the conducting state, while the first relay KB1, the second relay KA2, the second relay KB2, the third relay KA3, and the third relay KB3 are all in the off state.

[0099] When the surge protection circuit encounters a surge voltage phenomenon and the analysis unit 11 detects a surge signal, the analysis unit 11 will start to record the peak value and frequency of the surge current endured by the main unit 20, and upload the recorded data to the control chip 12 of the control unit 10. Then, the control chip 12 will compare the recorded data with the preset peak value limit and the preset frequency limit set in advance.

[0100] If both the recorded peak value and frequency of the surge current are not greater than the preset peak value limit and the preset frequency limit, the control chip 12 does not operate. At this time, the surge energy of the surge voltage phenomenon will only be normally discharged through the first varistor MOVA1 and the first transient suppression diode TVSA1 of the main unit A21.

[0101] If the recorded frequency is greater than the preset frequency limit value, then one hour after the first surge is suffered, the control chip 12 will control the first relay KB1 of the main unit B22 to conduct, and then disconnect the first relay KA1. At this time, the surge energy will only be discharged through the first varistor MOVB1 and the first transient suppression diode TVSB1 of the main unit B22. If after another hour, the frequency recorded by the analysis unit 11 is still greater than the preset frequency limit value, then the control chip 12 will control the second relay KA2 of the first auxiliary unit A31 to conduct, and then disconnect the first relay KB1. At this time, the surge energy will only be discharged through the second varistor MOVA2 and the first gas discharge tube GOTA1 of the first auxiliary unit A31. If after another hour, the frequency recorded by the analysis unit 11 is still greater than the preset frequency limit value, then the control chip 12 will control the second relay KB2 of the first auxiliary unit B32 to conduct, and then disconnect the second relay KA2. At this time, the surge energy will only be discharged through the second varistor MOVB2 and the first gas discharge tube GOTB1 of the first auxiliary unit B32. If after another hour, the frequency recorded by the analysis unit 11 is still greater than the preset frequency limit value, then the control chip 12 will control the third relay KA3 of the second auxiliary unit A41 to conduct, and disconnect the second relay KB2. At this time, the surge energy will only be discharged through the third varistor MOVA3, the second transient suppression diode TVSA2 and the second gas discharge tube GOTA2 of the second auxiliary unit A41. If after another hour, the frequency recorded by the analysis unit 11 is still greater than the preset frequency limit value, then the control chip 12 will control the third relay KB3 of the second auxiliary unit B42 to conduct, and disconnect the third relay KA3. At this time, the surge energy will only be discharged through the third varistor MOVB3, the second transient suppression diode TVSB2 and the second gas discharge tube GOTB2 of the second auxiliary unit B42. If after another hour, the frequency recorded by the analysis unit 11 is still greater than the preset frequency limit value, then the control chip 12 will control the first relay KA1 of the main unit A21 to conduct, and then disconnect the third relay KB3. At this time, the surge energy will be discharged through the first varistor MOVA1 and the first transient suppression diode TVSA1 of the main unit A21. By alternately controlling the conduction of the main unit A21, the main unit B22, the first auxiliary unit A31, the first auxiliary unit B32, the second auxiliary unit A41 and the second auxiliary unit B42, it can effectively prevent the components in the circuit from overheating due to too frequent discharge, and prevent component fatigue and thus damage.

[0102] If the peak value of the recorded inrush current is greater than the preset peak limit value, then on the basis of the conduction of the first relay KA1, the control chip 12 will also conduct the first relay KB1, the second relay KA2, the second relay KB2, the third relay KA3 and the third relay KB3 simultaneously to shunt the inrush energy and avoid the situation that the components in the circuit are damaged by excessive inrush energy.

[0103] If both the peak value and the frequency of the recorded inrush current are greater than the preset peak limit value and the preset frequency limit value, then the control chip 12 will still conduct the first relay KA1, the first relay KB1, the second relay KA2, the second relay KB2, the third relay KA3 and the third relay KB3 simultaneously, and then shunt the inrush energy to avoid the situation that the components in the circuit are damaged by excessive inrush energy.

[0104] When the analysis unit 11 does not detect an inrush signal within twelve hours, the control chip 12 will restore the surge protection to the default state, that is, only conduct the first relay KA1 and disconnect the first relay KB1, the second relay KA2, the second relay KB2, the third relay KA3 and the third relay KB3, so as to minimize the leakage current of the circuit that does not encounter inrush voltage, thereby reducing the loss and the potential hazard of electric shock.

[0105] Among them, in order to better discharge the inrush energy, the first transient voltage suppressor diode TVSA1, the first transient voltage suppressor diode TVSB1, the second transient voltage suppressor diode TVSA2 and the second transient voltage suppressor diode TVSB2 in this embodiment are all unidirectional transient voltage suppressor diodes; the first relay KA1, the first relay KB1, the second relay KA2, the second relay KB2, the third relay KA3 and the third relay KB3 are all single-pole single-throw relays; the first varistor MOVA1, the first varistor MOVB1, the second varistor MOVA2, the second varistor MOVB2, the third varistor MOVA3 and the third varistor MOVB3 are all metal oxide varistors. Embodiment 3

[0106] The present invention also provides an air conditioner, including a surge protection circuit.

[0107] Refer to the appendix Figure 1 The surge protection circuit includes: a control unit 10;

[0108] At least one main unit 20, which contains a varistor and a transient voltage suppressor diode;

[0109] At least one first auxiliary unit 30, which contains a varistor and a gas discharge tube;

[0110] At least one second auxiliary unit 40, which includes a varistor, a transient suppression diode and a gas discharge tube;

[0111] The control unit 10 is electrically connected to each main unit 20, each first auxiliary unit 30 and each second auxiliary unit 40 respectively, and the control unit 10 is used to control the on / off of the main unit 20, the first auxiliary unit 30 and the second auxiliary unit 40.

[0112] Wherein, the control unit 10 further includes an analysis unit 11, a control chip 12 and an isolation unit 13, and the analysis unit 11 is coupled to the main unit 20, the first auxiliary unit 30 and the second auxiliary unit 40 through the isolation unit 13 to prevent the surge from damaging the control chip 12. And since the analysis unit 11 is isolated from the main unit 20, the first auxiliary unit 30 and the second auxiliary unit 40 through the isolation unit 13, the current passing through the analysis unit 11 can be controlled at the mA level.

[0113] It should be noted that the function of the analysis unit 11 to analyze the surge voltage phenomenon is a common technology. That is, by presetting the corresponding logic in the MCU built in the analysis unit 11, when it detects the surge signal of the surge voltage phenomenon, it will start to record the current peak value and frequency of the circuit and upload them to the control chip 12, so that the control chip 12 controls the on / off of the corresponding relay.

[0114] In this way, when the air conditioner is powered on and started, the surge protection circuit is also powered on and started. And by default, only the relay of one main unit 20 is in the on state, and the relays of the remaining main units 20, the first auxiliary units 30 and the second auxiliary units 40 are all in the off state.

[0115] When the surge protection circuit encounters a surge voltage phenomenon, the analysis unit 11 will start to record the current peak value and frequency, and upload the recorded data to the control chip 12. Then the control chip 12 compares the received recorded data with the preset peak value limit and preset frequency limit set in advance.

[0116] When both the recorded peak current and frequency are not greater than the preset peak limit value and the preset frequency limit value, the control chip 12 only discharges the surge energy normally through the conducting main unit 20 at this time; when the recorded frequency is greater than the preset frequency limit value, starting from the first time the circuit is subjected to a surge voltage phenomenon, the control chip 12 will receive the circuit frequency recorded by the analysis unit 11 again every preset time. If it is still greater than the preset frequency limit value, the control chip 12 will alternately control the conduction of the relays of the main unit 20, the first auxiliary unit 30, and the second auxiliary unit 40, that is, only one unit works among all the main units 20, the first auxiliary unit 30, and the second auxiliary unit 40 at the same time, effectively avoiding the situation that the components in the circuit are damaged due to overheating caused by too frequent discharge and component fatigue.

[0117] If the recorded peak surge current is greater than the preset peak limit value, or both the peak surge current and the frequency are greater than the preset peak limit value and the preset frequency limit value, then on the basis of the relay K1 of the main unit 20 being turned on, the control chip 12 will also control the relay K3 of the first auxiliary unit 30 and the second auxiliary unit 40 to be turned on at the same time, so as to turn on all the main units 20, the first auxiliary unit 30, and the second auxiliary unit 40, and then shunt the surge energy to avoid the situation that the components in the circuit are damaged by excessive surge energy.

[0118] Obviously, the embodiments described above are only a part of the embodiments of the present invention, rather than all embodiments. The drawings show the preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing specific embodiments, or perform equivalent replacements for some of the technical features. Any equivalent structure directly or indirectly using the content of the specification and drawings of the present invention in other related technical fields is similarly within the scope of the patent protection of the present invention.

Claims

1. Anti-surge circuit, characterized in that, include: Control unit (10); at least one main unit (20) including a transient suppression diode; At least one first auxiliary unit (30) containing a gas discharge tube; At least one second auxiliary unit (40) comprising a transient suppression diode and a gas discharge tube; The control unit (10) is respectively connected to each of the main units (20), each of the first auxiliary units (30), and each of the second auxiliary units (40), and the control unit (10) is used to control the on and off of the main unit (20), the first auxiliary unit (30), and the second auxiliary unit (40).

2. The surge protection circuit according to claim 1, characterized in that: Each of the main units (20) comprises a first relay, a first varistor and a first transient suppression diode; Pin 2 of the first relay is connected to an input end of the control unit (10), pin 3 of the first relay is connected to a first end of the first varistor, a second end of the first varistor is connected to a first end of the first transient suppression diode, and a second end of the first transient suppression diode is grounded; Pin 1 of the first relay is connected to the first output end of the control unit (10), and pin 4 of the first relay is connected to the second output end of the control unit (10).

3. The surge protection circuit according to claim 2, characterized in that: Each of the first auxiliary units (30) comprises a second relay, a second varistor and a first gas discharge tube; Pin 2 of the second relay is connected to the input end of the control unit (10), pin 3 of the second relay is connected to the first end of the second varistor, the second end of the second varistor is connected to the first end of the first gas discharge tube, and the second end of the first gas discharge tube is grounded; Pin 1 of the second relay is connected to the first output end of the control unit (10), and pin 4 of the second relay is connected to the second output end of the control unit (10).

4. The surge protection circuit according to claim 3, characterized in that: Each of the second auxiliary units (40) comprises a third relay, a third varistor, a second transient suppression diode and a second gas discharge tube; Pin 2 of the third relay is connected to the input end of the control unit (10), pin 3 of the third relay is connected to the first end of the third varistor, the second end of the third varistor is connected to the first end of the second transient suppression diode, the second end of the second transient suppression diode is connected to the first end of the second gas discharge tube, and the second end of the second gas discharge tube is grounded; Pin 1 of the third relay is connected to the first output end of the control unit (10), and pin 4 of the third relay is connected to the second output end of the control unit (10).

5. The surge protection circuit according to claim 1, characterized in that: The control unit (10) comprises an analysis unit (11) for recording the surge current peak value and frequency; When the surge current peak value and frequency do not exceed the preset peak value limit and the preset frequency limit, the control unit (10) does not trigger the response action of the anti-surge circuit.

6. The surge protection circuit according to claim 5, characterized in that: The preset peak value limit is 10000A, and the preset frequency limit is 5cph.

7. The surge protection circuit according to any one of claims 1 to 4, characterized in that: The transient voltage suppression diode is a unidirectional transient voltage suppression diode or a bidirectional transient voltage suppression diode.

8. The surge protection circuit according to claim 4, characterized in that: The first relay, the second relay or the third relay is a single-pole single-throw relay.

9. The surge protection circuit according to claim 4, characterized in that: The first varistor, the second varistor or the third varistor is any one of a metal oxide varistor, a silicon carbide varistor, a germanium varistor or a silicon varistor.

10. An air conditioner, characterized in that The invention comprises the surge protection circuit as claimed in any one of claims 1 to 9.

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