Outdoor unit

Abstract

The utility model discloses an outdoor unit, comprising a filter circuit which is connected with the input end of a rectification unit, and the filter circuit comprises a protection unit, the front end of the protection unit is provided with three input ends, the three input ends respectively receive three-phase power lines of an AC input power supply, and two input ends corresponding to two-phase power supply receive a DC input power supply; the input end of the filtering unit is connected with the output end of the protection unit; the voltage dividing unit is connected to a three-phase output end at the rear end of the filtering unit; the switch control unit is controlled by the main control unit, enables the voltage dividing unit not to be connected to the three-phase output end when the alternating current input power supply is filtered, and enables the voltage dividing unit to be connected to the three-phase output end when the direct current input power supply is filtered; the DC voltage output by the AC input power supply after passing through the filter circuit and the rectification unit is consistent with the DC partial voltage output by the DC input power supply after passing through the filter circuit. According to the utility model, AC-DC compatible filtering can be realized, and the versatility of the filter circuit is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to air conditioner power filtering technical field especially relates to an outdoor unit. BACKGROUND

[0002] With the promotion of "double carbon" policy, direct current microgrid obtains rapid application in the field of building, and direct current driving demand is put forward for building load. The energy consumption proportion of air conditioner reaches about 40% in the building operation stage, therefore, direct current driving air conditioner obtains wide application in green building. At present, in the top air outlet product of multi-connected air conditioner, the top air outlet power is relatively big, the alternating current power supply generally adopts three-phase power 380V, and the wiring contains at least three fire lines, and the direct current power supply generally adopts 750V, and the wiring contains two lines of positive and negative poles.

[0003] Because there are differences in voltage grade, wiring quantity and the like between direct current and alternating current multi-connected air conditioner top air outlet, therefore, two sets of filter circuits are generally set for alternating current air conditioner and direct current air conditioner respectively, and management cost and production cost are increased. UTILITY MODEL CONTENT

[0004] In view of the problems pointed out in the background art, the utility model provides an outdoor unit, which can realize alternating current and direct current compatible filtering, improve the universality of the filter circuit, and reduce the management cost and production cost.

[0005] To achieve the utility model purposes, the utility model adopts the following technical solutions:

[0006] Some embodiments of the application relate to an outdoor unit, comprising:

[0007] A frequency conversion circuit, the frequency conversion circuit comprises a rectification unit, which is used for outputting rectified voltage;

[0008] A main control unit, which is used for controlling the functions of the outdoor unit,

[0009] A filter circuit connected to the input end of the rectification unit, and comprising:

[0010] A protection unit, which has three input ends at the front end, the three input ends receive UVW three-phase power lines of alternating current input power, two input ends corresponding to U and W two-phase electricity receive direct current input power, and the protection unit is used for protecting rear-end electrical devices;

[0011] A filter unit, the input end of which is connected to the output end of the protection unit, and is used for filtering the input power passing through the protection unit;

[0012] A voltage division unit connected to the three-phase output end at the rear end of the filter unit;

[0013] A switch control unit controlled by the main control unit and making the voltage dividing unit not access to the three-phase output end when filtering the alternating current input power source and making the voltage dividing unit access to the three-phase output end when filtering the direct current input power source;

[0014] The direct current voltage outputted by the alternating current input power source after passing through the filtering circuit and the rectifying unit is consistent with the direct current voltage outputted by the direct current input power source after passing through the filtering circuit.

[0015] The technical scheme of the embodiment has the following advantages and beneficial effects:

[0016] The filtering circuit comprises a protection unit, a filtering unit and a voltage dividing unit connected in sequence, the voltage dividing unit accesses to the filtering circuit when filtering the direct current input power source and plays a role of voltage dividing, so that the required direct current output voltage is obtained, and the voltage dividing unit does not access to the filtering circuit when filtering the alternating current input power source, so that the alternating current input power source is filtered and enters the frequency conversion circuit to output the required direct current power source, realizing filtering of both the alternating current input power source and the direct current input power source and meeting the use requirement of the frequency conversion circuit, thereby reducing the management cost and the production cost.

[0017] In some embodiments of the application, the voltage dividing unit comprises a first voltage dividing resistor and a second voltage dividing resistor, and the switch control unit comprises:

[0018] A first drive circuit controlled by the main control unit to output a first drive signal when filtering the alternating current input power source and to output a second drive signal when filtering the direct current input power source;

[0019] A first switch control element connected in series with the first voltage dividing resistor between the first-phase output end and the second-phase output end, the first switch control element being disconnected under the action of the first drive signal and being connected under the action of the second drive signal;

[0020] A second drive circuit controlled by the main control unit to output a third drive signal when filtering the alternating current input power source and to output a fourth drive signal when filtering the direct current input power source;

[0021] A second switch control element connected in series with the second voltage dividing resistor to form a branch, the branch being connected between the second-phase output end and the third-phase output end, the second switch control element being disconnected under the action of the third drive signal and being connected under the action of the fourth drive signal;

[0022] A third drive circuit controlled by the main control unit to output a fifth drive signal when filtering the alternating current input power source and to output a sixth drive signal when filtering the direct current input power source;

[0023] a third switch control element connected to a line between the common connection position of the branch connected to the third phase output terminal and the third phase output terminal, the third switch control element being turned on by the fifth drive signal and turned off by the sixth drive signal.

[0024] The technical scheme of the embodiment has the following advantages and beneficial effects:

[0025] According to different filtering conditions of the AC input power supply and the DC input power supply, the switch control unit is controlled to realize the connection or disconnection of the voltage dividing unit formed by the first voltage dividing resistor and the second voltage dividing resistor, so that the DC voltage output by the input power supply after entering the frequency conversion circuit is consistent, and the AC / DC filtering compatibility requirement is met.

[0026] In some embodiments of the application, the first switch control element comprises:

[0027] a first relay, the first drive circuit providing a power supply circuit for a coil of the first relay, a normally open switch of the first relay and the first voltage dividing resistor being connected in series between the first phase output terminal and the second phase output terminal, the coil of the first relay being de-energized when the first drive circuit outputs the first drive signal, and the coil of the first relay being energized when the first drive circuit outputs the second drive signal;

[0028] The second switch control element comprises:

[0029] a second relay, the second drive circuit providing a power supply circuit for a coil of the second relay, a normally open switch of the second relay and the second voltage dividing resistor being connected in series between the second phase output terminal and the third phase output terminal, the coil of the second relay being de-energized when the second drive circuit outputs the third drive signal, and the coil of the second relay being energized when the second drive circuit outputs the fourth drive signal;

[0030] The third switch control element comprises:

[0031] a third relay, the third drive circuit providing a power supply circuit for a coil of the third relay, a normally open switch of the third relay being connected to a line between the common connection position and the third phase output terminal, the coil of the third relay being energized when the third drive circuit outputs the fifth drive signal, and the coil of the third relay being de-energized when the third drive circuit outputs the sixth drive signal.

[0032] The technical scheme of the embodiment has the following advantages and beneficial effects:

[0033] The relay contact is used to realize the connection and disconnection of the voltage dividing resistor, thereby facilitating the control.

[0034] In some embodiments of the present application, the filter circuit further comprises:

[0035] A connector is configured to connect the first driving circuit, the second driving circuit, the third driving circuit, and the master control unit.

[0036] The technical scheme of the embodiment has the following advantages and beneficial effects:

[0037] The connector is used to facilitate the wiring connection between the driving circuit and the master control unit in the filter circuit.

[0038] In some embodiments of the present application, the protection unit is a lightning protection unit configured to protect the filter circuit from lightning.

[0039] The technical scheme of the embodiment has the following advantages and beneficial effects:

[0040] The outdoor unit is arranged outdoors, and the lightning protection unit is arranged to ensure the protection of the input power supply for the rear-end electrical devices, thereby avoiding damage caused by lightning.

[0041] In some embodiments of the present application, the lightning protection unit comprises:

[0042] A first voltage-dependent resistor has one end connected to a first input terminal;

[0043] A second voltage-dependent resistor has one end connected to a second input terminal;

[0044] A third voltage-dependent resistor has one end connected to a third input terminal;

[0045] A fourth voltage-dependent resistor has one end connected to a common connection position of the other end of the first voltage-dependent resistor, the other end of the second voltage-dependent resistor, and the other end of the third voltage-dependent resistor;

[0046] A first gas discharge tube has one end connected to the other end of the fourth voltage-dependent resistor, and the other end of the first gas discharge tube is grounded.

[0047] The technical scheme of the embodiment has the following advantages and beneficial effects:

[0048] The voltage-dependent resistor is used to clamp the voltage, and the gas discharge tube is used to discharge lightning transient overcurrent and limit overvoltage, thereby protecting the rear-end electrical devices, ensuring the voltage input reliability, and avoiding damage to the rear-end electrical devices.

[0049] In some embodiments of the present application, the filter unit comprises:

[0050] A first X capacitor group is connected between three-phase power lines.

[0051] a coupling inductor, disposed at a rear end of the first X capacitor group, and connected to the three-phase power lines;

[0052] a second X capacitor group, disposed at a rear end of the coupling inductor, and connected between the three-phase power lines;

[0053] a Y capacitor group, disposed at a rear end of the coupling inductor, and connected between the three-phase power lines and a ground line.

[0054] The technical scheme of the embodiment has the following advantages and beneficial effects:

[0055] The X capacitor can suppress differential mode interference, the Y capacitor can suppress common mode interference, and the coupling inductor can suppress interference and noise, thereby realizing reliable filtering of an input power supply and improving power supply reliability.

[0056] In some embodiments of the application, the coupling inductor comprises:

[0057] a first inductor, connected in series to a first-phase power line of the three-phase power lines;

[0058] a second inductor, connected in series to a second-phase power line of the three-phase power lines;

[0059] a third inductor, connected in series to a third-phase power line of the three-phase power lines.

[0060] The technical scheme of the embodiment has the following advantages and beneficial effects:

[0061] The use of inductors for DC and AC filtering can filter out interference and noise in the received signal, thereby improving power supply reliability.

[0062] In some embodiments of the application, the filter unit further comprises:

[0063] a second gas discharge tube, having two ends connected to two ends of any one of the first inductor, the second inductor and the third inductor, and connecting the corresponding power lines at a common connection position.

[0064] The technical scheme of the embodiment has the following advantages and beneficial effects:

[0065] The use of the gas discharge tube for discharging lightning transient overcurrent and limiting overvoltage plays a role in protecting the rear-end electrical devices, ensures voltage input reliability, and avoids damage to the rear-end electrical devices.

[0066] Other features and advantages of the application will become more apparent after reading the detailed description of the application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0067] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor under the premise of the drawings.

[0068] Figure 1 Principle of the outdoor unit embodiment proposed in the present application Figure 1 ;

[0069] Figure 2 Circuit structure of the rectifier unit in the frequency conversion circuit

[0070] Figure 3 Principle of the outdoor unit embodiment proposed in the present application Figure 2 ;

[0071] Figure 4 Principle diagram of the switch control unit in the outdoor unit embodiment proposed in the present application

[0072] Figure 5 Principle of the outdoor unit embodiment proposed in the present application Figure 3 ;

[0073] Figure 6 Principle of the filter circuit in the outdoor unit embodiment proposed in the present application Figure 1 ;

[0074] Figure 7 Principle diagram of the filter circuit in the outdoor unit embodiment proposed in the present application when filtering the alternating current input power supply

[0075] Figure 8 Principle diagram of the filter circuit in the outdoor unit embodiment proposed in the present application when filtering the direct current input power supply

[0076] Figure 9 Principle of the filter circuit in the outdoor unit embodiment proposed in the present application Figure 2 ;

[0077] Figure 10 Circuit diagram of the first drive loop in the outdoor unit embodiment proposed in the present application

[0078] Figure 11 Circuit diagram of the first drive loop in the outdoor unit embodiment proposed in the present application

[0079] Reference signs:

[0080] 10, frequency conversion circuit; 11, rectifier unit; 20, main control unit; 30, filter circuit; 31, protection unit; 32, filter unit; 33, voltage division unit; 34, switch control unit; 341, first drive circuit; 342, first switch control element; 343, second drive circuit; 344, second switch control element; 345, third drive circuit; 346, third switch control element; 35, connector. DETAILED DESCRIPTION

[0081] 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, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0082] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the present application.

[0083] The terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0084] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication between the two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0085] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can include direct contact between the first and second features, or indirect contact between the first and second features through another feature therebetween. Moreover, the first feature "on", "above" and "over" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "underneath" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0086] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. For the purpose of simplifying the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0087] An air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, a throttling element (e.g., an expansion valve), and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.

[0088] A low-temperature and low-pressure refrigerant enters the compressor, which compresses the refrigerant gas into 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.

[0089] The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant formed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by exchanging heat with a material to be cooled using the latent heat of evaporation of the refrigerant. Throughout the cycle, the air conditioner can adjust the temperature of the indoor space.

[0090] 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 expansion valve can be provided in the indoor unit or the outdoor unit.

[0091] The indoor heat exchanger and the outdoor heat exchanger are used as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.

[0092] The outdoor unit of the air conditioner is also commonly referred to as an air conditioner outdoor unit, and the indoor unit of the air conditioner is also commonly referred to as an air conditioner indoor unit.

[0093] In some embodiments of the present application, an air conditioner top air outlet product is also involved, and air outlet is achieved by controlling the fan.

[0094] Regardless of the ordinary air conditioner or the air conditioner top air outlet product, a driving load (for example, a compressor or a fan) is needed.

[0095] The variable frequency circuit 10 includes a rectifier unit 11, a PFC circuit, and an IPM (Intelligent Power Module), wherein the IPM is used to drive the load (for example, a compressor or a fan) of the variable frequency circuit 10.

[0096] The rectifier unit, the PFC circuit (not shown), and the IPM (not shown) in the variable frequency circuit 10 are all common circuit structures in the variable frequency circuit 10, and will not be described here.

[0097] Among them, the rectifier unit is a single-phase bridge rectifier composed of four diodes, or a three-phase bridge rectifier composed of six diodes.

[0098] In some embodiments of the present application, referring to Figure 1 , in order to filter the alternating current input power supply and the direct current input power supply, an alternating current and direct current compatible filter circuit 30 is arranged to avoid setting a filter circuit 30 for the alternating current input power supply and the direct current input power supply, which is convenient for management and general alternating current and direct current input power supply filtering scenarios.

[0099] The filter circuit 30 is arranged at the front end of the rectifier unit 11, that is, the alternating current (or direct current) input power supply enters the rectifier unit 11 after passing through the filter circuit 30, and therefore, different input ends of the rectifier unit 11 are used for the alternating current input power supply and the direct current input power supply.

[0100] In some embodiments of the present application, in order to meet the general filtering needs of alternating current and direct current input power supplies, referring to Figure 2 , the rectifier unit 11 can select a three-phase bridge rectifier composed of six diodes.

[0101] The three-phase bridge rectifier includes diodes D1, D2, D3, D4, D5, and D6. Diodes D1, D2, and D3 share a common cathode, while diodes D4, D5, and D6 share a common anode. The anode of diode D1 is connected to the cathode of diode D4, the anode of diode D2 is connected to the cathode of diode D5, and the anode of diode D3 is connected to the cathode of diode D6.

[0102] The position where the anode of diode D1 and the cathode of diode D4 are connected forms the first input terminal Input1 of rectifier unit 11, the position where the anode of diode D2 and the cathode of diode D5 are connected forms the second input terminal Input2 of rectifier unit 11, and the position where the anode of diode D3 and the cathode of diode D6 are connected forms the third input terminal Input3 of rectifier unit 11.

[0103] In some embodiments of this application, see Figure 3 and Figure 5 The filter circuit 30 includes a protection unit 31.

[0104] The protection unit 31 is located at the front end of the filter circuit 30 and is used to reduce the impact of the AC or DC input power supply at the front end on the back end devices, thereby protecting the back end devices.

[0105] For ease of description, the three input terminals at the front end of the protection unit 31 are respectively referred to as the first input terminal LI1, the second input terminal LI2 and the third input terminal LI3, and the three-phase output terminals of the corresponding filter circuit 30 are referred to as the first phase output terminal LO1, the second phase output terminal LO2 and the third phase output terminal LO3.

[0106] In some embodiments of this application, when filtering the AC input power supply, the three input terminals LI1 / LI2 / LI3 of the protection unit 31 are respectively connected to the three-phase power lines of the AC input power supply, and the three-phase output terminals of the filtering unit 32 are respectively connected to the first input terminal Input1, the second input terminal Input2 and the third input terminal Input3 of the rectifier unit 11.

[0107] In some embodiments of this application, when filtering the DC input power supply, the two input terminals LI1 / LI3 of the protection unit 31 are respectively connected to the positive and negative lines of the DC input power supply, and the two-phase output terminals LO1 / LO2 of the filter unit 32 output DC voltage are connected to any two of the first input terminal Input1, the second input terminal Input2, and the third input terminal Input3 of the rectifier unit 11 (for example, Input1 and Input2, Input2 and Input3, or Input1 and Input3).

[0108] In some embodiments of the present application, the protection unit 31 can be a lightning protection unit, an overvoltage protection unit, an overcurrent protection unit, or a combination of any of the above.

[0109] In some embodiments of the present application, the protection unit 31 selects a lightning protection unit for preventing the filter circuit 30 from being struck by lightning.

[0110] In some embodiments of the present application, the lightning protection unit includes a plurality of voltage-dependent resistors and a first gas discharge tube.

[0111] A voltage-dependent resistor is a resistor device with a non-linear voltage-current characteristic, mainly used for voltage clamping when the circuit is subjected to overvoltage, and absorbing excess current to protect sensitive devices; a gas discharge tube functions to discharge lightning transient overcurrent and limit overvoltage.

[0112] In some embodiments of the present application, referring to Figure 6 to Figure 9 , the plurality of voltage-dependent resistors includes a first voltage-dependent resistor RV1, a second voltage-dependent resistor RV2, a third voltage-dependent resistor RV3, and a fourth voltage-dependent resistor RV4.

[0113] One end of the first voltage-dependent resistor RV1 is connected to the first input terminal LI1, one end of the second voltage-dependent resistor RV2 is connected to the second input terminal LI2, one end of the third voltage-dependent resistor RV3 is connected to the first input terminal LI3, the other end of the first voltage-dependent resistor RV1, the other end of the second voltage-dependent resistor RV2, and the other end of the third voltage-dependent resistor RV3 are connected to one end of the fourth voltage-dependent resistor RV4, and the other end of the fourth voltage-dependent resistor RV4 is connected to ground through the first gas discharge tube G1.

[0114] In some embodiments of the present application, referring back to Figure 3 and Figure 5 , the filter circuit 30 further includes a filter unit 32 arranged at the rear end of the protection unit 31, for filtering the AC input power supply or the DC input power supply to filter out noise or interference, etc.

[0115] In some embodiments of the present application, referring to Figure 6 to Figure 9 , the filter circuit 30 includes a first X capacitor group, a coupling inductor L, a second X capacitor group, and a Y capacitor group.

[0116] The first X capacitor group is arranged between the protection unit 31 and the coupling inductor L, the second X capacitor group is arranged at the rear end of the coupling inductor L, and the Y capacitor group is also arranged at the rear end of the coupling inductor L.

[0117] The first X capacitor group includes a first X capacitor Cx1, a second X capacitor Cx2, and a third X capacitor Cx3.

[0118] The first X capacitor Cx1 has one end connected to the first input terminal LI1, the second X capacitor Cx2 has one end connected to the second input terminal LI2, and the third X capacitor Cx3 has one end connected to the third input terminal LI3. The other end of the first X capacitor Cx1, the other end of the second X capacitor Cx2, and the other end of the third X capacitor Cx3 are connected together, which can be connected to the other end of the first pressure-sensitive resistor RV1, the other end of the second pressure-sensitive resistor RV2, the other end of the third pressure-sensitive resistor RV3, and one end of the fourth pressure-sensitive resistor RV4.

[0119] In some embodiments of the present application, the coupling inductance L includes a first inductance L1, a second inductance L2, and a third inductance L3. The first inductance L1 is connected in series between the first input terminal LI1 and the first phase output terminal LO1, the second inductance L2 is connected between the second input terminal LI2 and the second phase output terminal LO2, and the third inductance L3 is connected in series between the third input terminal LI3 and the third phase output terminal LO3.

[0120] In some embodiments of the present application, the second X capacitor group includes a fourth X capacitor Cx4, a fifth X capacitor Cx5, and a sixth X capacitor Cx6. One end of the fourth X capacitor Cx4 is connected to the first phase output terminal LO1, one end of the fifth X capacitor Cx5 is connected to the second phase output terminal LO2, and one end of the sixth X capacitor Cx6 is connected to the third phase output terminal LO3. The other end of the fourth X capacitor Cx4, the other end of the fifth X capacitor Cx5, and the other end of the sixth X capacitor Cx6 are connected together.

[0121] In some embodiments of the present application, the Y capacitor group includes a first Y capacitor Cy1, a second Y capacitor Cy2, and a third Y capacitor Cy3. One end of the first Y capacitor Cy1 is connected to the first phase output terminal LO1, one end of the second Y capacitor Cy2 is connected to the second phase output terminal LO2, and one end of the third Y capacitor Cy3 is connected to the third phase output terminal LO3. The other end of the first Y capacitor Cy1, the other end of the second Y capacitor Cy2, and the other end of the third Y capacitor Cy3 are connected to the ground PE.

[0122] In some embodiments of the present application, referring to Figure 6 to Figure 9 The filter unit 32 further includes a second gas discharge tube G2.

[0123] The second gas discharge tube G2 has one end and the other end connected to one end and the other end of any phase inductance in the coupling inductance L, for example, the two ends of the second gas discharge tube G2 are connected to one end and the other end of the third inductance L3.

[0124] In some embodiments of the present application, for the same product, for example, air conditioner top air outlet product, in order to realize AC input power compatible filtering, that is, to realize that the DC voltage V1 obtained after the AC input power passes through the filtering circuit 30 and the frequency conversion circuit 10 and the DC voltage V2 output after the DC input power passes through the filtering circuit 30 are consistent (the frequency conversion circuit 10 basically does not affect the DC power supply), therefore, it is necessary to consider designing the voltage dividing unit 33, see Figure 3 to Figure 5 .

[0125] In some embodiments of the present application, when filtering the AC input power, the voltage dividing unit 33 is not connected, when filtering the DC input power, the voltage dividing unit 33 is connected, and the voltage output after the voltage dividing circuit is obtained, that is, the voltage size is equal to V2.

[0126] In some embodiments of the present application, in order to be able to control whether the voltage dividing unit 33 is connected or not, the filtering circuit 30 further comprises a switch control unit 34, see Figure 3 to Figure 5 .

[0127] The switch control unit 34 receives the control signal of the main control unit 20 in the outdoor unit to drive and control the action of the switch control unit 34.

[0128] When the input power is an AC input power, the main control unit 20 controls the action of the switch control unit 34, and the voltage dividing unit 33 is not connected to the rear end of the filtering unit 32, and when the input power is a DC input power, the main control unit 20 controls the action of the switch control unit 34, and the voltage dividing unit 33 is connected to the rear end of the filtering unit 32, and the filtered DC voltage is divided to output a voltage of a required size.

[0129] In some embodiments of the present application, see Figure 6 to Figure 9 , the voltage dividing unit 33 comprises a first voltage dividing resistor R1 and a second voltage dividing resistor R2, and the positions of the first voltage dividing resistor R1 and the second voltage dividing resistor R2 are set according to the two input terminals connected for the DC input power and the two-phase output terminals corresponding after filtering.

[0130] In some embodiments of the present application, see Figure 4 , the switch control unit 34 comprises a first drive circuit 341, a first switch control element 342, a second drive circuit 343, a second switch control element 344, a third drive circuit 345 and a third switch control element 346.

[0131] In some embodiments of the present application, see Figure 6 , when the first input terminal LI1 and the third input terminal LI3 are respectively connected to the positive and negative poles of the DC input power, the first-phase output terminal LO1 and the second-phase output terminal LO2 can be selected as the two-phase output terminals as described above.

[0132] At this time, the first voltage dividing resistor R1 and the first switch control element 342 are connected in series between the first phase output terminal LO1 and the second phase output terminal LO2, the second voltage dividing resistor R2 and the second switch control element 344 are connected in series to form a branch and the branch is connected between the second phase output terminal LO2 and the third phase output terminal LO3, and the third switch control element 346 is connected in series between the position where the branch connects the third phase output terminal LO3 and the third phase output terminal LO3.

[0133] In some embodiments of the present application, referring to Figure 9 When the first input terminal LI1 and the third input terminal LI3 are connected to the DC negative pole and the DC positive pole of the DC input power supply respectively, the second phase output terminal LO2 and the third phase output terminal LO3 can be used as the two-phase output terminals as described above.

[0134] At this time, the first voltage dividing resistor R1 and the first switch control element 342 are connected in series between the first phase output terminal LO1 and the second phase output terminal LO2, the second voltage dividing resistor R2 and the second switch control element 344 are connected in series to form a branch and the branch is connected between the second phase output terminal LO2 and the third phase output terminal LO3, and the third switch control element 346 is connected in series between the position where the branch connects the third phase output terminal LO3 and the third phase output terminal LO3.

[0135] The first switch control element 342 is controlled by the first drive circuit 341 to be turned on / off, the second switch control element 344 is controlled by the second drive circuit 343 to be turned on / off, and the third switch control element 346 is controlled by the third drive circuit 345 to be turned on / off, and the first drive circuit 341, the second drive circuit 343 and the third drive circuit 345 are all controlled by the main control unit 20.

[0136] In some embodiments of the present application, when filtering the AC input power supply, the main control unit 20 outputs a first control signal to make the first drive circuit 341 output a first drive signal to drive the first switch control element 342 to be open; the main control unit 20 outputs a second control signal to make the second drive circuit 343 output a second drive signal to drive the second switch control element 344 to be open; and the main control unit 20 outputs a third control signal to make the third drive circuit 345 output a third drive signal to drive the third switch control element 346 to be closed.

[0137] When filtering the DC input power supply, the first input terminal LI1 and the third input terminal LI3 are connected to the DC positive pole and the DC negative pole of the DC input power supply respectively, and the second phase output terminal LO2 and the third phase output terminal LO3 are used as the two-phase output terminals as described above.

[0138] The master control unit 20 outputs a fourth control signal to make the first drive circuit 341 output a fourth drive signal to drive the first switch control element 342 to be closed; the master control unit 20 outputs a fifth control signal to make the second drive circuit 343 output a fifth drive signal to drive the second switch control element 344 to be closed; and the master control unit 20 outputs a sixth control signal to make the third drive circuit 345 output a sixth drive signal to drive the third switch control element 346 to be opened.

[0139] The first control signal, the second control signal, the third control signal, the fourth control signal, the fifth control signal and the sixth control signal as described above can have the same level signal, for example, the first control signal and the second control signal are the same, and the fourth control signal and the fifth control signal are the same.

[0140] In some embodiments of the present application, the switch control elements as described above can be relays.

[0141] Referring to Figure 6 to Figure 8 , the first switch control element 342 is taken as a first relay, the second switch control element 344 is taken as a second relay, and the third switch control element 346 is taken as a third relay.

[0142] Referring to Figure 6 , the first drive circuit 341 provides a power supply circuit for the coil of the first relay KM1, and the normally open switch of the first relay KM1 and the first voltage dividing resistor R1 are connected in series between the first phase output terminal LO1 and the second phase output terminal LO2.

[0143] The second drive circuit 343 provides a power supply circuit for the coil of the second relay KM2, and the normally open switch of the second relay KM2 and the second voltage dividing resistor R2 are connected in series between the second phase output terminal LO2 and the third phase output terminal LO3.

[0144] The third drive circuit 345 provides a power supply circuit for the coil of the third relay KM3, and the normally open switch of the third relay KM3 is connected in series between the position where the second voltage dividing resistor R2 connects the third phase output terminal LO3 and the third phase output terminal LO3.

[0145] Referring to Figure 6 , when filtering the alternating current input power supply, the master control unit 20 outputs the first control signal to make the first drive circuit 341 output the first drive signal, which cannot provide a power supply circuit for the coil of the first relay KM1, at this time, the coil of the first relay KM1 is not powered, its normally open switch is opened, and the first voltage dividing resistor R1 is not connected between the first phase output terminal LO1 and the second phase output terminal LO2.

[0146] The main control unit 20 outputs a second control signal, so that the second drive circuit 343 outputs a second drive signal, and the power supply circuit for the coil of the second relay KM2 cannot be provided, at this time, the coil of the second relay KM2 cannot be powered, and the normally open switch of the second relay KM2 is opened, and the second voltage dividing resistor R2 is not connected between the second phase output terminal LO2 and the third phase output terminal LO3.

[0147] The main control unit 20 outputs a third control signal, so that the third drive circuit 345 outputs a third drive signal, and the power supply circuit for the coil of the third relay KM3 can be provided, at this time, the coil of the third relay KM3 is powered, and the normally open switch of the third relay KM3 is closed.

[0148] That is, referring to Figure 7 , the voltage dividing unit 33 is connected to the rear end of the filter unit 32, and the AC input power supply is filtered by the filter circuit 30, and then the filtered AC power supply is output to the three-phase output terminals LO1 / LO2 / LO3, and then input to the rectifying unit 11 in the frequency conversion circuit 10.

[0149] Referring to Figure 6 , when filtering the DC input power supply, the main control unit 20 outputs a fourth control signal, so that the first drive circuit 341 outputs a fourth drive signal, and the power supply circuit for the coil of the first relay KM1 can be provided, at this time, the coil of the first relay KM1 is powered, and the normally open switch of the first relay KM1 is closed, and the first voltage dividing resistor R1 is connected between the first phase output terminal LO1 and the second phase output terminal LO2.

[0150] The main control unit 20 outputs a fifth control signal, so that the second drive circuit 343 outputs a fifth drive signal, and the power supply circuit for the coil of the second relay KM2 can be provided, at this time, the coil of the second relay KM2 is powered, and the normally open switch of the second relay KM2 is closed, and the second voltage dividing resistor R2 is connected between the second phase output terminal LO2 and the third phase output terminal LO3.

[0151] The main control unit 20 outputs a sixth control signal, so that the third drive circuit 345 outputs a sixth control signal, and the power supply circuit for the coil of the third relay KM3 cannot be provided, at this time, the coil of the third relay KM3 cannot be powered, and the normally open switch of the third relay KM3 is opened.

[0152] That is, referring to Figure 8 , the voltage dividing unit 33 is connected to the rear end of the filter unit 32, and the DC input power supply is filtered by the filter circuit 30, and then the filtered DC power supply is output to the two-phase output terminals LO1 / LO2 after passing through the voltage dividing unit 33, and then input to the rectifying unit 11 in the frequency conversion circuit 10.

[0153] In some embodiments of the present application, referring to Figure 9The first switch control element 342 described in the middle is a relay KM11, the second switch control element 344 is a relay KM12, and the third switch control element 346 is a relay KM13. Referring to Figure 10 and Figure 11 which exemplarily shows the circuit structure of the first drive circuit 341.

[0154] In some embodiments of the present application, referring to Figure 10 , the first drive circuit 341 includes an NPN tube Q3 and a current-limiting resistor R6.

[0155] The base of the NPN tube Q3 is connected to the output end of the master control unit 20 outputting the first control signal through the current-limiting resistor R6, the emitter is grounded, and the collector is connected to one end of the coil of the first relay KM1. The other end of the coil is connected to the power supply Vcc through the current-limiting resistor R8.

[0156] The master control unit 20 outputs a high-level signal at the output end, and the NPN tube Q3 in the first drive circuit 341 is turned on, so that the power supply Vcc supplies power to the coil, and the normally open switch is closed.

[0157] The master control unit 20 outputs a low-level signal at the output end, and the NPN tube Q3 is cut off, so that the power supply Vcc does not supply power to the coil, and the normally open switch is opened.

[0158] In some embodiments of the present application, referring to Figure 11 , the first drive circuit 341 includes an NMOS tube Q1 and a current-limiting resistor R2'.

[0159] The gate of the NMOS tube Q1 is connected to the output end of the master control unit 20 outputting the first control signal through the current-limiting resistor R2', the source is grounded, and the drain is connected to one end of the coil of the first relay KM1. The other end of the coil is connected to the power supply Vcc through the current-limiting resistor R7.

[0160] The master control unit 20 outputs a high-level signal at the output end, and the NMOS tube Q1 in the first drive circuit 341 is turned on, so that the power supply Vcc supplies power to the coil, and the normally open switch is closed.

[0161] The master control unit 20 outputs a low-level signal at the output end, and the NMOS tube Q1 is cut off, so that the power supply Vcc does not supply power to the coil, and the normally open switch is opened.

[0162] As described above, in the case of meeting the control requirements, the normally closed switch of the relay can also be selected, which is not described here.

[0163] In some embodiments of the present application, the same product is used in the same variable frequency circuit 10, for example, air conditioner top air outlet product, AC power supply generally uses three-phase power 380V, and DC power supply generally uses 750V. After the AC three-phase power 380V enters the variable frequency circuit 10, the bus voltage is about 540V, therefore, when the DC input power is 750V, the voltage output by the voltage divider should be about 540V.

[0164] In this way, in combination with Figure 8 , according to the DC input voltage 750V before voltage division and the DC voltage 540V output after voltage division, the resistance values of the first voltage dividing resistor R1 and the second voltage dividing resistor R2 can be designed, that is, R1 / R2=18 / 7.

[0165] According to the ratio of R1 / R2, the resistance values of the first voltage dividing resistor R1 and the second voltage dividing resistor R2 are selected.

[0166] The DC input power and the AC input power both use the same filter circuit 30, avoiding cost investment and facilitating management.

[0167] In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0168] The above is only a specific implementation manner of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An outdoor unit characterized by comprising: The outdoor unit comprises: a variable frequency circuit comprising a rectification unit for outputting a rectified voltage; a main control unit for controlling the execution of functions of the outdoor unit; a filter circuit connected to an input end of the rectification unit and comprising: a protection unit having three input ends at a front end thereof, the three input ends receiving three-phase power lines of an alternating current (AC) input power supply, two input ends corresponding to two-phase electricity receiving direct current (DC) input power supply, the protection unit being used for protecting electrical devices at a rear end thereof; a filter unit having an input end connected to an output end of the protection unit, the filter unit being used for filtering the input power supply passing through the protection unit; a voltage division unit connected to three-phase output ends at a rear end of the filter unit; a switch control unit controlled by the main control unit, the switch control unit causing the voltage division unit to be disconnected from the three-phase output ends when filtering the AC input power supply, and causing the voltage division unit to be connected to the three-phase output ends when filtering the DC input power supply; wherein a DC voltage outputted by the AC input power supply after passing through the filter circuit and the rectification unit is consistent with a DC voltage division outputted by the DC input power supply after passing through the filter circuit.

2. The outdoor unit according to claim 1, characterized by The voltage division unit comprises a first voltage division resistor and a second voltage division resistor, and the switch control unit comprises: a first drive circuit controlled by the main control unit to output a first drive signal when filtering the AC input power supply, and controlled by the main control unit to output a second drive signal when filtering the DC input power supply; a first switch control element connected in series with the first voltage division resistor between a first-phase output end and a second-phase output end, the first switch control element being disconnected by the first drive signal and being connected by the second drive signal; a second drive circuit controlled by the main control unit to output a third drive signal when filtering the AC input power supply, and controlled by the main control unit to output a fourth drive signal when filtering the DC input power supply; a second switch control element connected in series with the second voltage division resistor to form a branch, the branch being connected between the second-phase output end and a third-phase output end, the second switch control element being disconnected by the third drive signal and being connected by the fourth drive signal; a third drive circuit controlled by the main control unit to output a fifth drive signal when filtering the AC input power supply, and controlled by the main control unit to output a sixth drive signal when filtering the DC input power supply; a third switch control element connected to a line between a common connection position of the branch connected to the third-phase output end and the third-phase output end, the third switch control element being connected by the fifth drive signal and being disconnected by the sixth drive signal.

3. The outdoor unit according to claim 2, wherein the first switch control element comprises: ​ A first relay, the first drive circuit provides a power supply circuit for the coil of the first relay, the normally open switch of the first relay and the first voltage dividing resistor are connected in series between the first phase output and the second phase output, when the first drive circuit outputs the first drive signal, the coil of the first relay is not powered, when the second drive signal is outputted by the second drive circuit, the coil of the first relay is powered; The second switch control element comprises: A second relay, the second drive circuit provides a power supply circuit for the coil of the second relay, the normally open switch of the second relay and the second voltage dividing resistor are connected in series between the second phase output and the third phase output, when the third drive signal is outputted by the second drive circuit, the coil of the second relay is not powered, when the fourth drive signal is outputted by the second drive circuit, the coil of the second relay is powered; The third switch control element comprises: A third relay, the third drive circuit provides a power supply circuit for the coil of the third relay, the normally open switch of the third relay is connected to the line between the common connection position and the third phase output, when the fifth drive signal is outputted by the third drive circuit, the coil of the third relay is powered, when the sixth drive signal is outputted by the third drive circuit, the coil of the third relay is not powered.

4. The outdoor unit according to claim 2 or 3, characterized by The filter circuit further comprises: A connector for connecting the first drive circuit, the second drive circuit, the third drive circuit and the main control unit.

5. The outdoor unit according to claim 1, wherein The protection unit is a lightning protection unit for preventing the filter circuit from being struck by lightning.

6. The outdoor unit according to claim 5, characterized by The lightning protection unit comprises: A first voltage-dependent resistor having one end connected to the first input; A second voltage-dependent resistor having one end connected to the second input; A third voltage-dependent resistor having one end connected to the third input; A fourth voltage-dependent resistor having one end connected to the common connection position of the other end of the first voltage-dependent resistor, the other end of the second voltage-dependent resistor and the other end of the third voltage-dependent resistor; A first gas discharge tube having one end connected to the other end of the fourth voltage-dependent resistor, and the other end grounded.

7. The outdoor unit according to claim 1, characterized by The filter unit comprises: A first X capacitor group connected between the three-phase power lines; A coupling inductor disposed at the rear end of the first X capacitor group and connected to the three-phase power lines; A second X capacitor group disposed at the rear end of the coupling inductor and connected between the three-phase power lines; A Y capacitor group disposed at the rear end of the coupling inductor and connected between the three-phase power lines and the ground line.

8. The outdoor unit according to claim 7, characterized by The coupling inductor comprises: A first inductor connected in series to the first phase power line among the three-phase power lines; A second inductor connected in series to the second phase power line among the three-phase power lines; A third inductor connected in series to the third phase power line among the three-phase power lines.

9. The outdoor unit according to claim 8, characterized by The filter unit further comprises: A second gas discharge tube having both ends connected to the common connection position of the corresponding power line between any one of the first inductor, the second inductor and the third inductor.

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