Refrigerator and driving control method thereof

Abstract

The invention discloses a refrigerator and a driving control method thereof, the refrigerator comprises a refrigerator body, a refrigerating system, a frequency conversion plate and a controller, and the frequency conversion plate is arranged in a compressor of the refrigerating system and used for adjusting the rotating speed of the compressor; the frequency conversion board comprises a switching device and a driving circuit, the switching device is used for controlling on and off of the circuit, the driving circuit is used for providing driving voltage for the switching device, and the driving circuit adjusts the driving voltage according to the type of the switching device; the controller is configured to control a driving voltage output by the driving circuit to be a first voltage when the switching device is a first switching device; and when the switching device is a second switching device, the driving voltage output by the driving circuit is controlled to be a second voltage. The driving circuit is designed on the frequency conversion board, the driving voltage can be adjusted according to different switching devices, the frequency conversion board does not need to be replaced, the development and design time and cost are effectively saved, the production efficiency is improved, and material generalization is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerators, and in particular to a refrigerator and a driving control method thereof. Background Art

[0002] The switch devices of existing refrigerator inverter boards usually use IGBT switch tubes. In order to improve efficiency, some manufacturers will replace IGBT switch tubes with MOS tubes to improve efficiency by reducing the loss of power devices. However, the driving voltage of general IGBT switch tubes is 15V, and the driving voltage of MOS tubes is 10V. The driving power supplies of the two are not compatible. Usually, two inverter boards need to be replaced, which not only requires redesigning the power supply, but also has high costs and low production efficiency. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a refrigerator and a drive control method thereof. By designing a drive circuit on a frequency conversion board, the size of the drive voltage can be adjusted according to the difference of the switching device without replacing the frequency conversion board, thereby effectively saving development and design time and cost, improving production efficiency, and realizing material standardization.

[0004] A refrigerator provided in a first embodiment of the present invention includes:

[0005] The box body, which serves as the supporting structure of the refrigerator, has several compartments inside;

[0006] A refrigeration system is arranged in the box, and includes a compressor, a condenser, an evaporator and a fan. The compressor is used to provide power for the refrigeration cycle of the refrigerator, and the fan is used to allow air to enter the evaporator of the refrigerator for heat exchange and send the heat-released air to the refrigerator compartment;

[0007] A frequency conversion board, which is arranged in the compressor and is used to adjust the speed of the compressor;

[0008] The frequency conversion board includes a switch device and a drive circuit, wherein the switch device is used to control the on and off of the circuit, and the drive circuit is used to provide a drive voltage for the switch device, and the drive circuit adjusts the magnitude of the drive voltage according to the type of the switch device;

[0009] The controller is configured to, when the switching device is a first switching device, control the driving voltage output by the driving circuit to be a first voltage; and when the switching device is a second switching device, control the driving voltage output by the driving circuit to be a second voltage.

[0010] In the refrigerator provided by the second embodiment of the present invention, the driving circuit includes a level signal input terminal, a first voltage output terminal, a second voltage output terminal, a first triode, a second triode, a first resistor, a second resistor, a third resistor, a fourth resistor and a power chip;

[0011] The base of the first triode is connected to the level signal input terminal, the emitter of the first triode is grounded, the collector of the first triode is connected to the base of the second triode, the emitter of the second triode is connected to the first voltage output terminal, the collector of the second triode is connected to the first resistor, and the base of the second triode is also connected to the second voltage output terminal;

[0012] The output end of the power chip is connected to the first resistor, the second resistor, the third resistor and the fourth resistor respectively.

[0013] In the refrigerator provided by the third embodiment of the present invention, when the level signal input terminal is at a low level, the switch device is a first switch device, the first transistor is controlled not to be conductive, the second transistor is controlled not to be conductive, and the first voltage output terminal outputs a first voltage to the first switch device;

[0014] When the level signal input terminal is at a high level, the switch device is a second switch device, the first transistor and the second transistor are controlled to be turned on, and the second voltage output terminal outputs a second voltage to the second switch device.

[0015] In the refrigerator provided by the fourth embodiment of the present invention, the driving circuit further comprises a connector, and the connector is connected to the level signal input terminal;

[0016] If the connector is disconnected, the level signal input terminal is controlled to be at a low level;

[0017] If the connector is short-circuited, the level signal input terminal is controlled to be a high level.

[0018] In the refrigerator provided by the fifth embodiment of the present invention, the first switching device is an IGBT switching tube, the second switching device is a MOS tube; and the first voltage is greater than the second voltage.

[0019] A refrigerator drive control method is provided in a sixth embodiment of the present invention, and the method is applied to a refrigerator including a cabinet, a refrigeration system and a frequency conversion board; wherein the cabinet serves as a supporting structure of the refrigerator, and is provided with a plurality of compartments therein; the refrigeration system is arranged in the cabinet, and includes a compressor, a condenser, an evaporator and a fan, wherein the compressor is used to provide power for the refrigeration cycle of the refrigerator, and the fan is used to allow air to enter the evaporator of the refrigerator for heat exchange and send the heat-released air to the refrigerator compartment; the frequency conversion board is arranged in the compressor, and is used to adjust the speed of the compressor; the frequency conversion board includes a switch device and a drive circuit, wherein the switch device is used to control the conduction and disconnection of the circuit, and the drive circuit is used to provide a drive voltage for the switch device, and the drive circuit adjusts the magnitude of the drive voltage according to the type of the switch device, and the refrigerator drive control method includes:

[0020] When the switch device is a first switch device, controlling the drive voltage output by the drive circuit to be a first voltage;

[0021] When the switch device is a second switch device, the drive voltage output by the drive circuit is controlled to be a second voltage.

[0022] In the refrigerator driving control method provided by the seventh embodiment of the present invention, the driving circuit includes a level signal input terminal, a first voltage output terminal, a second voltage output terminal, a first triode, a second triode, a first resistor, a second resistor, a third resistor, a fourth resistor and a power chip;

[0023] The base of the first triode is connected to the level signal input terminal, the emitter of the first triode is grounded, the collector of the first triode is connected to the base of the second triode, the emitter of the second triode is connected to the first voltage output terminal, the collector of the second triode is connected to the first resistor, and the base of the second triode is also connected to the second voltage output terminal;

[0024] The output end of the power chip is connected to the first resistor, the second resistor, the third resistor and the fourth resistor respectively.

[0025] In the refrigerator driving control method provided by the eighth embodiment of the present invention, when the level signal input terminal is at a low level, the switch device is a first switch device, the first transistor is controlled not to be conductive, the second transistor is controlled not to be conductive, and the first voltage output terminal outputs a first voltage to the first switch device;

[0026] When the level signal input terminal is at a high level, the switch device is a second switch device, the first transistor and the second transistor are controlled to be turned on, and the second voltage output terminal outputs a second voltage to the second switch device.

[0027] In the refrigerator driving control method provided by the ninth embodiment of the present invention, the driving circuit further comprises a connector, and the connector is connected to the level signal input terminal;

[0028] If the connector is disconnected, the level signal input terminal is controlled to be at a low level;

[0029] If the connector is short-circuited, the level signal input terminal is controlled to be a high level.

[0030] In the refrigerator driving control method provided by the tenth embodiment of the present invention, the first switching device is an IGBT switching tube, the second switching device is a MOS tube; and the first voltage is greater than the second voltage.

[0031] Compared with the prior art, the beneficial effect of a refrigerator and a drive control method thereof provided by an embodiment of the present invention is that by designing a drive circuit on the frequency conversion board, the magnitude of the drive voltage can be adjusted according to the different switching devices. When the switching device is a first switching device, the drive voltage output by the control drive circuit is the first voltage, and when the switching device is a second switching device, the drive voltage output by the control drive circuit is the second voltage. In this way, when the second switching device is used to replace the first switching device, there is no need to replace the frequency conversion board, redesign the power supply and PCB, and the frequency conversion board can be compatible with the two by only replacing the switching device, which effectively saves development and design time and cost, improves production efficiency, and realizes material commonality. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a structural schematic diagram of a refrigerator provided by an embodiment of the present invention;

[0033] Figure 2 It is a structural schematic diagram of a refrigerator body provided by one embodiment of the present invention;

[0034] Figure 3 It is a structural schematic diagram of a single refrigeration system of a refrigerator provided by an embodiment of the present invention;

[0035] Figure 4 It is a structural schematic diagram of a dual refrigeration system of a refrigerator provided by one embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of a driving circuit of a frequency conversion board of a refrigerator provided by an embodiment of the present invention;

[0037] Figure 6 This is another schematic diagram of a driving circuit of a frequency conversion board of a refrigerator provided by one embodiment of the present invention;

[0038] Figure 7 This is a circuit diagram of a frequency conversion board of a refrigerator provided by an embodiment of the present invention;

[0039] Figure 8 It is a schematic diagram of a power supply circuit of a single chip microcomputer of a refrigerator provided by an embodiment of the present invention;

[0040] Fig. 9 This is a circuit diagram of a refrigerator driving chip provided by an embodiment of the present invention;

[0041] Fig.10 It is a flow chart of a refrigerator driving control method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] See also Figure 1 , Figure 1: is a schematic diagram of the structure of a refrigerator provided in one embodiment of the present invention. The refrigerator provided in the embodiment of the present invention comprises:

[0047] The box body 10, which serves as the supporting structure of the refrigerator, is provided with a plurality of compartments inside;

[0048] A refrigeration system 20 is provided in the box, and includes a compressor, a condenser, an evaporator and a fan. The compressor is used to provide power for the refrigeration cycle of the refrigerator, and the fan is used to allow air to enter the evaporator of the refrigerator for heat exchange and send the heat-released air to the refrigerator compartment;

[0049] A frequency conversion board 30, which is arranged in the compressor and is used to adjust the speed of the compressor;

[0050] The frequency conversion board 30 includes a switch device and a drive circuit, wherein the switch device is used to control the on and off of the circuit, and the drive circuit is used to provide a drive voltage for the switch device, and the drive circuit adjusts the magnitude of the drive voltage according to the type of the switch device;

[0051] The controller 40 is configured to, when the switching device is a first switching device, control the driving voltage output by the driving circuit to be a first voltage; and when the switching device is a second switching device, control the driving voltage output by the driving circuit to be a second voltage.

[0052] Specifically, a refrigerator provided in an embodiment of the present invention includes a cabinet 10, a refrigeration system 20, a frequency conversion board 30 and a controller 40. Figure 2 , Figure 2 It is a structural schematic diagram of a refrigerator body provided by an embodiment of the present invention. The refrigerator in this embodiment has an approximately rectangular shape, and the refrigerator includes a body 10 that defines a storage space. The body 10 serves as a supporting structure of the refrigerator, and is provided with a chamber inside, wherein the chamber includes a component storage cavity for placing components in the refrigerator, such as a compressor, etc., and also includes a storage space for storing food, etc. The storage space can be divided into a plurality of storage rooms (i.e., compartments), and the storage rooms can be configured as a refrigeration room, a freezing room, and a temperature-changing room (also called a fresh-keeping room) according to different uses. One or more door bodies 200 are provided at the opening of each storage room, for example, Figure 2 The upper storage room is a cold storage room, which is provided with a double-opening door body. The door body 200 includes a door body outer shell 210 located outside the box body 10, a door body inner liner 220 located inside the box body 10, an upper end cover 230, a lower end cover 240, and an insulation layer located between the door body outer shell 210, the door body inner liner 220, the upper end cover 230, and the lower end cover 240; usually, the insulation layer is filled with foam material. The door body can be pivotally arranged at the opening of the box body, and can also be opened in a drawer-like manner to achieve drawer-like storage.

[0053] The refrigerator performs refrigeration operation through the refrigeration system, providing cold energy to the compartment so as to maintain the compartment at a constant low temperature. Specifically, the refrigeration system of the refrigerator in this embodiment can be a single refrigeration system or a dual refrigeration system. Figure 3 , Figure 3 The single refrigeration system of a refrigerator provided in one embodiment of the present invention is a schematic diagram of the structure. The single refrigeration system of the refrigerator described in the embodiment of the present invention comprises a compressor 1, a condenser 2, an anti-condensation tube 3, a drying filter 4, a capillary tube 5, an evaporator 6 and a gas-liquid separator 7, and the working structure of the refrigeration system includes a compression process, a condensation process, a throttling process and an evaporation process.

[0054] The compression process is as follows: plug in the power cord of the refrigerator, and when the refrigerator needs to be cooled, the compressor 1 starts to work, and the low-temperature and low-pressure refrigerant is sucked into the compressor, compressed into high-temperature and high-pressure superheated gas in the cylinder of the compressor 1, and then discharged to the condenser 2;

[0055] The condensation process is as follows: the high-temperature, high-pressure refrigerant gas dissipates heat through the condenser 2, the temperature continues to drop, and is gradually cooled to a saturated vapor at room temperature and high pressure, and further cooled to a saturated liquid, the temperature no longer drops. The temperature at this time is called the condensation temperature, and the pressure of the refrigerant remains almost unchanged during the entire condensation process;

[0056] The throttling process is as follows: the condensed refrigerant saturated liquid is filtered through the drying filter 4 to remove moisture and impurities and then flows into the capillary 5, through which the throttling and pressure reduction are carried out, and the refrigerant becomes wet steam at room temperature and low pressure;

[0057] The evaporation process is as follows: the refrigerant begins to absorb heat and vaporize in the evaporator 6, which not only reduces the temperature of the evaporator and its surroundings, but also turns the refrigerant into a low-temperature, low-pressure gas. The refrigerant coming out of the evaporator 6 passes through the gas-liquid separator 7 and returns to the compressor 1 again. The above process is repeated to transfer the heat in the refrigerator to the air outside the box, thereby achieving the purpose of refrigeration.

[0058] The fan allows air to continuously enter the fins of the evaporator 6 for heat exchange, and at the same time sends the air that becomes cold after the evaporator 6 releases heat to the refrigerator room through the air duct, so that the air in the room continuously circulates and flows, achieving the purpose of lowering the temperature.

[0059] See also Figure 4 , Figure 4: is a structural schematic diagram of a dual refrigeration system of a refrigerator provided by an embodiment of the present invention. The dual refrigeration system of the refrigerator described in the embodiment of the present invention includes a compressor 21 for compressing the refrigerant, a first capillary tube 14a and a second capillary tube 14b for decompressing the refrigerant, a refrigeration evaporator 15a and a freezing evaporator 15b as heat absorption mechanisms, a three-way valve 17 for controlling the refrigerant flow path, a one-way valve 18 for preventing the refrigerant from flowing back, a dryer 19 for removing moisture in the refrigeration cycle, and a refrigerant junction 13 for connecting the refrigerant flow path, which are connected by a pipe 20 to circulate the refrigerant to form a refrigeration cycle. In this process, the fans 12a and 12b respectively provided for each storage room are used to speed up the air flow rate, thereby speeding up the speed at which the refrigeration evaporator and the freezing evaporator absorb heat and improving the refrigeration speed of the storage room. Among them, the three-way valve 17 has a first outflow port 17a and a second outflow port 17b. When the three-way valve 17 is controlled to open the first outflow port 17a, the refrigerant flows sequentially through the first capillary tube 14a, the refrigeration evaporator 15a, the gas-liquid separator 16a, and the refrigerant junction 13, and then returns to the compressor 21. After passing through the first capillary tube 14a, the low-pressure and low-temperature refrigerant flows through the refrigeration evaporator 15a, performs heat exchange with the refrigeration evaporator 15a and the air in the refrigeration chamber 110, and refrigerates the refrigeration chamber 110. Similarly, when the three-way valve 17 is controlled to open the second outflow port 17b, the refrigerant flows sequentially through the second capillary tube 14b, the freezing evaporator 15b, the gas-liquid separator 16b, and the refrigerant junction 13, and then returns to the compressor 21. After passing through the second capillary tube 14b, the low-pressure and low-temperature refrigerant flows through the freezing evaporator 15b, performs heat exchange with the freezing evaporator 15b and the air in the freezing chamber 120, and refrigerates the freezing chamber 120.

[0060] The frequency conversion board 30 is arranged in the compressor, and the speed of the compressor can be freely adjusted within a certain range by continuously adjusting the voltage and frequency based on the PWM pulse width modulation technology. At the same time, the frequency conversion board can also automatically adjust the speed of the compressor according to the temperature changes inside the refrigerator to maintain a constant temperature. When the refrigerator needs to be refrigerated, the frequency conversion board will send a signal to the compressor to make the compressor run at a higher speed, thereby improving the refrigeration efficiency. When the refrigerator needs to be kept warm, the frequency conversion board will send a signal to the compressor to reduce the speed of the compressor to reduce energy consumption and noise. The frequency conversion board 30 includes a switching device and a drive circuit, the switching device is used to control the conduction and shutdown of the circuit, the drive circuit is used to provide a drive voltage for the switching device, and the drive circuit can adjust the size of the drive voltage according to the type of the switching device. The controller 40 is configured to, when the switching device is a first switching device, control the drive voltage output by the drive circuit to be a first voltage; when the switching device is a second switching device, control the drive voltage output by the drive circuit to be a second voltage.

[0061] The embodiment of the present invention can adjust the magnitude of the driving voltage according to the different switching devices by designing the driving circuit on the frequency conversion board. When the switching device is the first switching device, the driving voltage output by the driving circuit is controlled to be the first voltage. When the switching device is the second switching device, the driving voltage output by the driving circuit is controlled to be the second voltage. In this way, when the second switching device is used to replace the first switching device, there is no need to replace the frequency conversion board, redesign the power supply and PCB. The frequency conversion board can be compatible with the two by only replacing the switching device, which effectively saves development and design time and cost, improves production efficiency, and realizes material commonality.

[0062] As one of the optional embodiments, the driving circuit includes a level signal input terminal, a first voltage output terminal, a second voltage output terminal, a first triode, a second triode, a first resistor, a second resistor, a third resistor, a fourth resistor and a power chip;

[0063] The base of the first triode is connected to the level signal input terminal, the emitter of the first triode is grounded, the collector of the first triode is connected to the base of the second triode, the emitter of the second triode is connected to the first voltage output terminal, the collector of the second triode is connected to the first resistor, and the base of the second triode is also connected to the second voltage output terminal;

[0064] The output end of the power chip is connected to the first resistor, the second resistor, the third resistor and the fourth resistor respectively.

[0065] For details, please refer to Figure 5 , Figure 5 It is a schematic diagram of a driving circuit of a frequency conversion board of a refrigerator provided by an embodiment of the present invention. In the embodiment of the present invention, the driving circuit includes a level signal input terminal 1, a first voltage output terminal VDD1, a second voltage output terminal VDD2, a first transistor Q1, a second transistor Q2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a power chip 2. Among them, the base of the first transistor Q1 is connected to the level signal input terminal 1, the emitter of the first transistor Q1 is grounded, the collector of the first transistor Q1 is connected to the base of the second transistor Q2, the emitter of the second transistor Q2 is connected to the first voltage output terminal VDD1, the collector of the second transistor Q2 is connected to the first resistor R1, and the base of the second transistor Q2 is also connected to the second voltage output terminal VDD2. The output end of the power chip is connected to the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 respectively.

[0066] As one of the optional embodiments, when the level signal input terminal is at a low level, the switch device is a first switch device, the first transistor is controlled not to be conductive, the second transistor is controlled not to be conductive, and the first voltage output terminal outputs a first voltage to the first switch device;

[0067] When the level signal input terminal is at a high level, the switch device is a second switch device, the first transistor and the second transistor are controlled to be turned on, and the second voltage output terminal outputs a second voltage to the second switch device.

[0068] For details, please refer to Figure 6 , Figure 6 It is another schematic diagram of a drive circuit of a frequency conversion board of a refrigerator provided by an embodiment of the present invention. In the embodiment of the present invention, the base of the first transistor Q81 of the drive circuit is connected to the level signal input terminal POWER, the emitter of the first transistor Q81 is grounded, the collector of the first transistor Q81 is connected to the base of the second transistor Q80, the emitter of the second transistor Q80 is connected to the first voltage output terminal VDD1, the collector of the second transistor Q80 is connected to the first resistor R88, and the base of the second transistor Q80 is also connected to the second voltage output terminal VDD2. The output end of the power chip is respectively connected to the first resistor R88, the second resistor R85, the third resistor R86 and the fourth resistor R84. In the embodiment of the present invention, the level signal of the POWER network is controlled by a single chip microcomputer, and then the conduction of the two transistors Q81 and Q80 is controlled, thereby controlling whether the loop where R88 is located is turned on. When the level signal input terminal POWER is at a low level, the switch device is the first switch device, then the first transistor Q81 is controlled not to be turned on, the second transistor Q80 is controlled not to be turned on, the R88 loop is blocked, and only R85, R86 and R84 perform voltage division as the feedback loop of the power supply. At this time, the first voltage output terminal outputs the first voltage to the first switch device. When the level signal input terminal POWER is at a high level, the switch device is the second switch device, then the first transistor Q81 is controlled to be turned on, the second transistor Q80 is controlled to be turned on, then R88 is connected in parallel with R85, and performs voltage division with R86 and R84. At this time, the second voltage output terminal outputs the second voltage to the second switch device.

[0069] For example, in the embodiment of the present invention, the power chip is PN8085L, FB is the output voltage feedback pin, the internal comparator is built-in, and the reference voltage is 3.3V, that is, when Q80 is not conducting, the voltage-dividing resistors are R85, R84, and R86, and the output voltage VDD1 can be calculated to be [3.3 / (R84+R86)]*(R84+R85+R86)≈15V. When Q80 is conducting, R85 is connected in parallel with R88, and then divides the voltage with R84 and R86, and the output voltage VDD2 can be calculated to be [3.3 / (R84+R86)]*[R84+R86+(R85 / / R88)]≈10V.

[0070] As one of the optional embodiments, the driving circuit further includes a connector, and the connector is connected to the level signal input terminal;

[0071] If the connector is disconnected, the level signal input terminal is controlled to be at a low level;

[0072] If the connector is short-circuited, the level signal input terminal is controlled to be a high level.

[0073] For details, please refer to Figure 7 , Figure 7 This is a circuit diagram of a frequency conversion board of a refrigerator provided by an embodiment of the present invention. The embodiment of the present invention can distinguish whether the current device is the first switch device or the second switch device by detecting the level signal of the SELECT network of the single-chip computer, and then adjust the level signal of POWER. The level signal of the SELECT network can be adjusted by the short-circuit or open-circuit state of the connector XP1. If the connector XP1 is open-circuited, the SELECT pin is pulled up to 5V, which is a high level. It is configured as the first switch device by default, and the control level signal input terminal is a low level, and the drive circuit outputs the first voltage. If the connector XP1 is short-circuited, the SELECT pin is grounded, which is a low level. It is configured as the second switch device by default, and the control level signal input terminal is a high level, and the drive circuit outputs the second voltage.

[0074] As one of the optional embodiments, the first switching device is an IGBT switching tube, and the second switching device is a MOS tube; the first voltage is greater than the second voltage.

[0075] Specifically, in the embodiment of the present invention, the first switch device is an IGBT switch tube, and the second switch device is a MOS tube. The driving voltage of the IGBT switch tube is generally 15V, and the driving voltage of the MOS tube is generally 10V, so the first voltage is greater than the second voltage. In the embodiment of the present invention, if XP1 is open-circuited, the SELECT pin is 5V, the software configures IGBT by default, and the POWER pin is controlled to output a low level. If the POWER pin is low, Q81 is not conducting, Q80 is not conducting, the feedback loop resistor is R85, and the FB pin output voltage VDD1 is 15V. If XP1 is short-circuited, the SELECT pin is 0V, the software configures MOS by default, and the POWER pin is controlled to output a high level. If the POWER pin is high, Q81 is conducting, Q80 is conducting, and the feedback loop resistor is R85 and R88 in parallel, the resistance value becomes smaller, and the FB voltage divider becomes larger, so the output voltage VDD2 is reduced to 10V.

[0076] The embodiment of the present invention can realize automatic adjustment of the driving voltage by short-circuiting a connector, so that it can automatically switch between 15V and 10V. In addition, the frequency conversion board does not need to distinguish the material number, and is compatible with the driving circuits of IGBT and MOS. There is no need to replace the frequency conversion board and the power supply scheme, which saves development time. The driving power supplies of IGBT and MOS are integrated into a frequency conversion board to improve production efficiency. There is no need to purchase two PCBs for production, and material commonality is achieved.

[0077] See also Figure 8 , Figure 8 This is a schematic diagram of a power supply circuit of a single-chip microcomputer of a refrigerator provided by an embodiment of the present invention. The input voltage range of the circuit is 6.5V-27V, so no matter whether the driving voltage is 10V or 15V, it can output a voltage of 5V, providing a correct power supply for the single-chip microcomputer, and the power supply voltage of the single-chip microcomputer will not be affected by the change of the driving voltage.

[0078] See also Fig. 9 , Fig. 9 This is a circuit diagram of a refrigerator driver chip provided by an embodiment of the present invention. In this circuit, the power supply voltage of the driver chip PN7336 is VDD2, and its operating voltage range is 8-20V. Therefore, whether the driving voltage is 10V or 15V, the driver chip can work normally. However, the output driving voltage is the same as VDD2, so different driving voltages can be output as needed to drive IGBT or MOS tube. The bit numbers V61 / V60 / V51 / V50 / V41 / V40 in the figure are power device IGBT / MOS tubes.

[0079] See also Fig.10 , Fig.10It is a flow chart of a refrigerator drive control method provided by an embodiment of the present invention. The refrigerator drive control method provided in the embodiment of the present invention is applied to a refrigerator including a cabinet, a refrigeration system and a frequency conversion board; wherein the cabinet serves as a supporting structure of the refrigerator, and is provided with a plurality of compartments inside; the refrigeration system is arranged in the cabinet, including a compressor, a condenser, an evaporator and a fan, the compressor is used to provide power for the refrigeration cycle of the refrigerator, the fan is used to allow air to enter the evaporator of the refrigerator for heat exchange and send the heat-released air to the refrigerator compartment; the frequency conversion board is arranged in the compressor, and is used to adjust the speed of the compressor; the frequency conversion board includes a switch device and a drive circuit, the switch device is used to control the conduction and disconnection of the circuit, the drive circuit is used to provide a drive voltage for the switch device, and the drive circuit adjusts the size of the drive voltage according to the type of the switch device, and the refrigerator drive control method includes:

[0080] S1, when the switch device is a first switch device, controlling the drive voltage output by the drive circuit to be a first voltage;

[0081] S2, when the switching device is a second switching device, controlling the driving voltage output by the driving circuit to be a second voltage.

[0082] The embodiment of the present invention can adjust the magnitude of the driving voltage according to the different switching devices by designing the driving circuit on the frequency conversion board. When the switching device is the first switching device, the driving voltage output by the driving circuit is controlled to be the first voltage. When the switching device is the second switching device, the driving voltage output by the driving circuit is controlled to be the second voltage. In this way, when the second switching device is used to replace the first switching device, there is no need to replace the frequency conversion board, redesign the power supply and PCB. The frequency conversion board can be compatible with the two by only replacing the switching device, which effectively saves development and design time and cost, improves production efficiency, and realizes material commonality.

[0083] As one of the optional embodiments, the driving circuit includes a level signal input terminal, a first voltage output terminal, a second voltage output terminal, a first triode, a second triode, a first resistor, a second resistor, a third resistor, a fourth resistor and a power chip;

[0084] The base of the first triode is connected to the level signal input terminal, the emitter of the first triode is grounded, the collector of the first triode is connected to the base of the second triode, the emitter of the second triode is connected to the first voltage output terminal, the collector of the second triode is connected to the first resistor, and the base of the second triode is also connected to the second voltage output terminal;

[0085] The output end of the power chip is connected to the first resistor, the second resistor, the third resistor and the fourth resistor respectively.

[0086] Specifically, the driving circuit in the embodiment of the present invention includes a level signal input terminal 1, a first voltage output terminal VDD1, a second voltage output terminal VDD2, a first triode Q1, a second triode Q2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a power chip 2. Among them, the base of the first triode Q1 is connected to the level signal input terminal 1, the emitter of the first triode Q1 is grounded, the collector of the first triode Q1 is connected to the base of the second triode Q2, the emitter of the second triode Q2 is connected to the first voltage output terminal VDD1, the collector of the second triode Q2 is connected to the first resistor R1, and the base of the second triode Q2 is also connected to the second voltage output terminal VDD2. The output terminal of the power chip is respectively connected to the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4.

[0087] As one of the optional embodiments, when the level signal input terminal is at a low level, the switch device is a first switch device, the first transistor is controlled not to be conductive, the second transistor is controlled not to be conductive, and the first voltage output terminal outputs a first voltage to the first switch device;

[0088] When the level signal input terminal is at a high level, the switch device is a second switch device, the first transistor and the second transistor are controlled to be turned on, and the second voltage output terminal outputs a second voltage to the second switch device.

[0089] Specifically, in the embodiment of the present invention, the base of the first transistor Q81 of the driving circuit is connected to the level signal input terminal POWER, the emitter of the first transistor Q81 is grounded, the collector of the first transistor Q81 is connected to the base of the second transistor Q80, the emitter of the second transistor Q80 is connected to the first voltage output terminal VDD1, the collector of the second transistor Q80 is connected to the first resistor R88, and the base of the second transistor Q80 is also connected to the second voltage output terminal VDD2. The output end of the power chip is respectively connected to the first resistor R88, the second resistor R85, the third resistor R86 and the fourth resistor R84. The embodiment of the present invention controls the level signal of the POWER network through the single chip microcomputer, and then controls the conduction of the two transistors Q81 and Q80, thereby controlling whether the loop where R88 is located is turned on. When the level signal input terminal POWER is at a low level, the switch device is the first switch device, then the first transistor Q81 is controlled not to be turned on, the second transistor Q80 is controlled not to be turned on, the R88 loop is blocked, and only R85, R86 and R84 perform voltage division as the feedback loop of the power supply. At this time, the first voltage output terminal outputs the first voltage to the first switch device. When the level signal input terminal POWER is at a high level, the switch device is the second switch device, then the first transistor Q81 is controlled to be turned on, the second transistor Q80 is controlled to be turned on, then R88 is connected in parallel with R85, and performs voltage division with R86 and R84. At this time, the second voltage output terminal outputs the second voltage to the second switch device.

[0090] For example, in the embodiment of the present invention, the power chip is PN8085L, FB is the output voltage feedback pin, the internal comparator is built-in, and the reference voltage is 3.3V, that is, when Q80 is not conducting, the voltage-dividing resistors are R85, R84, and R86, and the output voltage VDD1 can be calculated to be [3.3 / (R84+R86)]*(R84+R85+R86)≈15V. When Q80 is conducting, R85 is connected in parallel with R88, and then divides the voltage with R84 and R86, and the output voltage VDD2 can be calculated to be [3.3 / (R84+R86)]*[R84+R86+(R85 / / R88)]≈10V.

[0091] As one of the optional embodiments, the driving circuit further includes a connector, and the connector is connected to the level signal input terminal;

[0092] If the connector is disconnected, the level signal input terminal is controlled to be at a low level;

[0093] If the connector is short-circuited, the level signal input terminal is controlled to be a high level.

[0094] Specifically, the embodiment of the present invention can distinguish whether the current device is the first switch device or the second switch device by detecting the level signal of the SELECT network of the single-chip computer, and then adjust the level signal of POWER. The level signal of the SELECT network can be adjusted by the state of the short circuit or open circuit of the connector XP1. If the connector XP1 is open circuit, the SELECT pin is pulled up to 5V, which is a high level. It is configured as the first switch device by default, and the control level signal input terminal is a low level, and the drive circuit outputs the first voltage. If the connector XP1 is short circuited, the SELECT pin is grounded, which is a low level. It is configured as the second switch device by default, and the control level signal input terminal is a high level, and the drive circuit outputs the second voltage.

[0095] As one of the optional embodiments, the first switching device is an IGBT switching tube, and the second switching device is a MOS tube; the first voltage is greater than the second voltage.

[0096] Specifically, in the embodiment of the present invention, the first switch device is an IGBT switch tube, and the second switch device is a MOS tube. The driving voltage of the IGBT switch tube is generally 15V, and the driving voltage of the MOS tube is generally 10V, so the first voltage is greater than the second voltage. In the embodiment of the present invention, if XP1 is open-circuited, the SELECT pin is 5V, the software configures IGBT by default, and the POWER pin is controlled to output a low level. If the POWER pin is low, Q81 is not conducting, Q80 is not conducting, the feedback loop resistor is R85, and the FB pin output voltage VDD1 is 15V. If XP1 is short-circuited, the SELECT pin is 0V, the software configures MOS by default, and the POWER pin is controlled to output a high level. If the POWER pin is high, Q81 is conducting, Q80 is conducting, and the feedback loop resistor is R85 and R88 in parallel, the resistance value becomes smaller, and the FB voltage divider becomes larger, so the output voltage VDD2 is reduced to 10V.

[0097] The embodiment of the present invention can realize automatic adjustment of the driving voltage by short-circuiting a connector, so that it can automatically switch between 15V and 10V. In addition, the frequency conversion board does not need to distinguish the material number, and is compatible with the driving circuits of IGBT and MOS. There is no need to replace the frequency conversion board and the power supply scheme, which saves development time. The driving power supplies of IGBT and MOS are integrated into a frequency conversion board to improve production efficiency. There is no need to purchase two PCBs for production, and material commonality is achieved.

[0098] The embodiment of the present invention provides a refrigerator and a driving control method thereof. By designing a driving circuit on a frequency conversion board, the magnitude of the driving voltage can be adjusted according to the different switching devices. When the switching device is a first switching device, the driving voltage output by the driving circuit is controlled to be a first voltage. When the switching device is a second switching device, the driving voltage output by the driving circuit is controlled to be a second voltage. In this way, when the second switching device is used to replace the first switching device, there is no need to replace the frequency conversion board, redesign the power supply and PCB. The frequency conversion board can be compatible with the two by only replacing the switching device, which effectively saves development and design time and cost, improves production efficiency, and realizes material commonality.

[0099] It should be noted that the system embodiment described above is merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the drawings of the system embodiment provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art may understand and implement it without paying any creative effort.

[0100] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A refrigerator, characterized in that: include: The box body, which serves as the supporting structure of the refrigerator, has several compartments inside; A refrigeration system is arranged in the box, and includes a compressor, a condenser, an evaporator and a fan. The compressor is used to provide power for the refrigeration cycle of the refrigerator, and the fan is used to allow air to enter the evaporator of the refrigerator for heat exchange and send the heat-released air to the refrigerator compartment; A frequency conversion board, which is arranged in the compressor and is used to adjust the speed of the compressor; The frequency conversion board includes a switch device and a drive circuit, wherein the switch device is used to control the on and off of the circuit, and the drive circuit is used to provide a drive voltage for the switch device, and the drive circuit adjusts the magnitude of the drive voltage according to the type of the switch device; The controller is configured to, when the switching device is a first switching device, control the driving voltage output by the driving circuit to be a first voltage; and when the switching device is a second switching device, control the driving voltage output by the driving circuit to be a second voltage.

2. The refrigerator according to claim 1, characterized in that: The driving circuit comprises a level signal input terminal, a first voltage output terminal, a second voltage output terminal, a first triode, a second triode, a first resistor, a second resistor, a third resistor, a fourth resistor and a power chip; The base of the first triode is connected to the level signal input terminal, the emitter of the first triode is grounded, the collector of the first triode is connected to the base of the second triode, the emitter of the second triode is connected to the first voltage output terminal, the collector of the second triode is connected to the first resistor, and the base of the second triode is also connected to the second voltage output terminal; The output end of the power chip is connected to the first resistor, the second resistor, the third resistor and the fourth resistor respectively.

3. The refrigerator according to claim 2, characterized in that: When the level signal input terminal is at a low level, the switch device is a first switch device, the first transistor is controlled not to be turned on, the second transistor is controlled not to be turned on, and the first voltage output terminal outputs a first voltage to the first switch device; When the level signal input terminal is at a high level, the switch device is a second switch device, the first transistor and the second transistor are controlled to be turned on, and the second voltage output terminal outputs a second voltage to the second switch device.

4. The refrigerator according to claim 3, characterized in that: The driving circuit further comprises a plug-in connector, and the plug-in connector is connected to the level signal input terminal; If the connector is disconnected, the level signal input terminal is controlled to be at a low level; If the connector is short-circuited, the level signal input terminal is controlled to be a high level.

5. The refrigerator according to any one of claims 1 to 4, characterized in that: The first switch device is an IGBT switch tube, and the second switch device is a MOS tube; the first voltage is greater than the second voltage.

6. A refrigerator driving control method, characterized in that: The method is applied to a refrigerator including a box, a refrigeration system and a frequency conversion board; wherein the box serves as a supporting structure of the refrigerator and is provided with a plurality of compartments therein; the refrigeration system is arranged in the box and includes a compressor, a condenser, an evaporator and a fan, wherein the compressor is used to provide power for the refrigeration cycle of the refrigerator, and the fan is used to allow air to enter the evaporator of the refrigerator for heat exchange and send the air after heat release to the refrigerator compartment; the frequency conversion board is arranged in the compressor and is used to adjust the speed of the compressor; the frequency conversion board includes a switch device and a drive circuit, wherein the switch device is used to control the conduction and disconnection of the circuit, and the drive circuit is used to provide a drive voltage for the switch device, and the drive circuit adjusts the magnitude of the drive voltage according to the type of the switch device, and the refrigerator drive control method includes: When the switch device is a first switch device, controlling the drive voltage output by the drive circuit to be a first voltage; When the switch device is a second switch device, the drive voltage output by the drive circuit is controlled to be a second voltage.

7. The refrigerator driving control method according to claim 6, characterized in that: The driving circuit comprises a level signal input terminal, a first voltage output terminal, a second voltage output terminal, a first triode, a second triode, a first resistor, a second resistor, a third resistor, a fourth resistor and a power chip; The base of the first triode is connected to the level signal input terminal, the emitter of the first triode is grounded, the collector of the first triode is connected to the base of the second triode, the emitter of the second triode is connected to the first voltage output terminal, the collector of the second triode is connected to the first resistor, and the base of the second triode is also connected to the second voltage output terminal; The output end of the power chip is connected to the first resistor, the second resistor, the third resistor and the fourth resistor respectively.

8. The refrigerator driving control method according to claim 7, characterized in that: When the level signal input terminal is at a low level, the switch device is a first switch device, the first transistor is controlled not to be turned on, the second transistor is controlled not to be turned on, and the first voltage output terminal outputs a first voltage to the first switch device; When the level signal input terminal is at a high level, the switch device is a second switch device, the first transistor and the second transistor are controlled to be turned on, and the second voltage output terminal outputs a second voltage to the second switch device.

9. The refrigerator driving control method according to claim 8, characterized in that: The driving circuit further comprises a plug-in connector, and the plug-in connector is connected to the level signal input terminal; If the connector is disconnected, the level signal input terminal is controlled to be at a low level; If the connector is short-circuited, the level signal input terminal is controlled to be a high level.

10. The refrigerator driving control method according to any one of claims 6 to 9, characterized in that: The first switch device is an IGBT switch tube, and the second switch device is a MOS tube; the first voltage is greater than the second voltage.

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