Damper control circuit, damper system and refrigerator

Abstract

The application discloses a damper control circuit, a damper system and a refrigerator. The damper control circuit comprises: a plurality of damper control interfaces, which are respectively used for one-to-one electrical connection with controlled ends of a plurality of damper assemblies; a damper control chip, an input end of the damper control chip being used for electrical connection with a main controller, the damper control chip being used for level conversion processing of a driving signal output by the main controller and outputting corresponding multiple driving levels; and a plurality of damper driving circuits, input ends of the plurality of damper driving circuits being respectively electrically connected with the damper control chip, output ends of the plurality of damper driving circuits being respectively one-to-one electrically connected with the plurality of damper control interfaces, and controlled ends of the plurality of damper driving circuits being respectively used for electrical connection with the main controller. The technical scheme of the application aims to realize control of multiple dampers and reduce the occupation of circuit space.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigerators, in particular to a damper control circuit, a damper system and a refrigerator. BACKGROUND

[0002] At present, the control methods of the damper in the refrigerator industry are mostly divided into two kinds, one is to control one damper by using one damper chip, and the other is to control the damper by the main chip MCU cooperating with the triode driving circuit. The former control method needs multiple damper control chips when applied to multiple damper control, which seriously increases the space occupation of the circuit. SUMMARY

[0003] The main purpose of the present application is to provide a damper control circuit, a damper system and a refrigerator, which aims to control multiple dampers while reducing the occupation of the circuit space.

[0004] In order to achieve the above purpose, the damper control circuit provided by the present application is applied to a refrigerator, the refrigerator comprises multiple damper assemblies and a main controller, and the damper control circuit comprises:

[0005] Multiple damper control interfaces, each of the multiple damper control interfaces is used for one-to-one electrical connection with a controlled end of the multiple damper assemblies;

[0006] A damper control chip, an input end of the damper control chip is used for electrical connection with the main controller, and the damper control chip is used for level conversion processing of a driving signal output by the main controller and output of corresponding multiple driving levels;

[0007] Multiple damper driving circuits, input ends of the multiple damper driving circuits are respectively electrically connected with the damper control chip, output ends of the multiple damper driving circuits are respectively one-to-one electrically connected with the multiple damper control interfaces, and controlled ends of the multiple damper driving circuits are respectively used for electrical connection with the main controller, and each of the damper driving circuits is used for controlling a corresponding group of the damper assemblies to open / close according to the multiple driving levels received when a damper selection signal output by the main controller is received.

[0008] In some embodiments, the damper assemblies comprise a first damper assembly and a second damper assembly, the number of the damper control interfaces is two, including a first damper control interface and a second damper control interface, and the number of the damper driving circuits is two, including a first damper driving circuit and a second damper driving circuit.

[0009] The multiple input ends of the first damper driving circuit are electrically connected with the damper control chip respectively, the output end of the first damper driving circuit is electrically connected with the first damper control interface, the controlled end of the first damper driving circuit is used for connecting with the first selection signal output end of the main controller, and the first damper driving circuit is further used for controlling the first damper assembly to open / close according to the received multiple driving levels when receiving the first damper selection signal output by the main controller.

[0010] The multiple input ends of the second damper driving circuit are electrically connected with the damper control chip respectively, the output end of the second damper driving circuit is electrically connected with the second damper control interface, the controlled end of the second damper driving circuit is used for connecting with the second selection signal output end of the main controller, and the second damper driving circuit is further used for controlling the second damper assembly to open / close according to the received multiple driving levels when receiving the second damper selection signal output by the main controller.

[0011] In some embodiments, the damper control interface has multiple wiring ends, and the damper driving circuit comprises:

[0012] Multiple driving branches, the input end of each of the multiple driving branches is electrically connected with one of the multiple output ends of the damper control chip in one-to-one correspondence, the output end of each of the multiple driving branches is electrically connected with one of the multiple wiring ends of the corresponding damper control interface in one-to-one correspondence, and the controlled end of each of the multiple driving branches is used for accessing the same damper selection signal.

[0013] The driving branch is used for, when receiving the damper selection signal output by the main controller, cooperating with the remaining driving branches in the damper driving circuit to control the corresponding group of damper assemblies to open / close.

[0014] In some embodiments, the driving branch comprises a first resistor, a second resistor, a first diode, a first switch tube and a second switch tube.

[0015] The input end of the first switch tube is the input end of the driving branch, and is connected with the cathode of the first diode and the first end of the first resistor respectively, the output end of the first switch tube is the output end of the driving branch, and is connected with the anode of the second switch tube, the controlled end of the first switch tube is connected with the second end of the first resistor and the first end of the second resistor respectively, the controlled end of the second switch tube is the controlled end of the driving branch, the input end of the second switch tube is connected with the second end of the second resistor, and the output end of the second switch tube is grounded.

[0016] In some embodiments, the first switch tube and the second switch tube are at least one of MOS tubes or triodes.

[0017] In some embodiments, the damper control circuit further comprises:

[0018] a current-limiting resistor, a first end of the current-limiting resistor is connected with one output end of the damper control chip and one input end of the drive branch respectively, and a second end of the current-limiting resistor is grounded, for limiting the drive level output by the damper control chip.

[0019] In some embodiments, the damper control circuit further comprises:

[0020] a filter capacitor, a first end of the filter capacitor is connected with the first end of the current-limiting resistor, one output end of the damper control chip and one input end of the drive branch respectively, and a second end of the filter capacitor is grounded, for filtering the drive level output by the damper control chip.

[0021] The application further provides a damper system comprising the damper assembly, the main controller and the damper control circuit.

[0022] The input end and the controlled end of the damper control circuit are connected with the main controller respectively, and the controlled end of the damper assembly is connected with the output end of the damper control circuit.

[0023] In some embodiments, the damper system further comprises:

[0024] a voltage reduction circuit, an input end of the voltage reduction circuit is used for connecting with a direct current power supply, an output end of the voltage reduction circuit is connected with a power supply end of the main controller, and the voltage reduction circuit is used for supplying power to the main controller after reducing and stabilizing the connected direct current power supply.

[0025] The application further provides a refrigerator comprising the damper system or comprising the damper assembly, the main controller and the damper control circuit.

[0026] The technical scheme of the application adopts the damper drive circuit, the input ends of multiple damper drive circuits are connected with the same damper control chip, when the damper control chip receives the drive signal, the drive level converted from the drive signal can simultaneously provide the drive level for multiple damper assemblies, and the controlled end of each damper drive circuit is connected with the output end of one main controller, so that the main controller can select one damper drive circuit to output, thereby realizing the control of multiple damper assemblies simultaneously by using only one damper control chip, and reducing the space occupation of the circuit. BRIEF DESCRIPTION OF DRAWINGS

[0027] 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 only represent some of the embodiments of the present application, and for those skilled in the field, other drawings can be obtained from the structures shown in these drawings without any creative effort.

[0028] Figure 1 Structure block diagram of an embodiment of the air door control circuit of the present application;

[0029] Figure 2 Structure block diagram of another embodiment of the air door control circuit of the present application;

[0030] Figure 3 Structure block diagram of still another embodiment of the air door control circuit of the present application;

[0031] Figure 4 Circuit structure diagram of an embodiment of the air door control circuit of the present application;

[0032] Figure 5 Circuit structure diagram of the prior art of the present application.

[0033] Explanation of reference numerals:

[0034] Reference Name Reference Name 100 damper control interface 330 drive branch 110 first damper control interface Ra current-limiting resistor 120 second damper control interface Ca filtering capacitor 200 damper control chip Q1-Q2 first switch tube-second switch tube 300 damper drive circuit D1 first diode 310 first damper drive circuit R1-R2 first resistor-first resistor 320 second damper drive circuit

[0035] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort fall within the scope of protection of the present application.

[0037] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that the technical solutions can be realized by those skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0038] The application provides a damper control circuit applied to a refrigerator.

[0039] Referring to Figure 1 In an embodiment, the refrigerator comprises a plurality of damper assemblies and a main controller, and the damper control circuit comprises:

[0040] a plurality of damper control interfaces 100, each of which is electrically connected to a controlled end of a corresponding damper assembly;

[0041] a damper control chip 200, an input end of which is electrically connected to the main controller, and the damper control chip 200 is configured to perform level conversion processing on a driving signal output by the main controller and output corresponding driving levels;

[0042] a plurality of damper driving circuits 300, input ends of the plurality of damper driving circuits 300 are electrically connected to the damper control chip 200, output ends of the plurality of damper driving circuits 300 are electrically connected to the plurality of damper control interfaces 100 in one-to-one correspondence, and controlled ends of the plurality of damper driving circuits 300 are electrically connected to the main controller, and each damper driving circuit 300 is configured to control a corresponding group of damper assemblies to open / close according to the received driving levels when receiving a damper selection signal output by the main controller.

[0043] It should be noted that a plurality of damper assemblies are usually arranged in the refrigerator, and each damper assembly comprises a plurality of windings and a rotor. When the refrigerator is working, a driving level representing damper opening is output to each winding, so that the plurality of windings control the rotor to rotate clockwise to open the damper, so that the cold air in the refrigerator blows into the refrigerating chamber and / or the freezing chamber to realize refrigeration in the refrigerator. Alternatively, a driving level representing damper closing is output to each winding, so that the plurality of windings control the rotor to rotate counterclockwise to close the damper, and the continuous temperature drop in the refrigerator is stopped. The driving level is a square wave signal, and different square wave signals with different numbers of square waves are output to the damper assembly to control the damper assembly to open / close. Thus, by controlling the working state of the damper assembly, the refrigeration temperature of the refrigerator can be maintained at a user-required temperature value.

[0044] In the embodiment, the damper control interface 100 has a plurality of wiring ends, the number of the wiring ends is determined by the number of windings of the connected damper assembly, and when the damper assembly is controlled by two pairs of windings, the number of the wiring ends is four. The damper driving circuit 300 is composed of a plurality of switch tubes and a plurality of resistors.

[0045] It can be understood that when the damper assembly is working, each controlled end connected with the damper control interface 100 needs to access a corresponding driving level, which is output by the damper control chip 200 according to the received driving signal. In the prior art, one damper control chip 200 is used to output multiple driving levels to drive multiple windings in one damper assembly. If multiple damper assemblies need to be controlled to open / close at the same time, the main controller needs to output corresponding enable signals and driving signals to multiple damper control chips 200 at the same time, which seriously increases the space occupation of the circuit.

[0046] Therefore, the damper driving circuit 300 is adopted in the present application. The input ends of multiple damper driving circuits 300 are connected with the same damper control chip 200. When the damper control chip 200 receives the driving signal, the driving level converted from the driving signal can simultaneously provide driving levels for multiple damper assemblies. The controlled end of each damper driving circuit 300 is connected with the output end of one main controller, so that the main controller can select one damper driving circuit 300 to output, thereby realizing the control of multiple damper assemblies at the same time by using only one damper control chip 200, and reducing the space occupation of the circuit.

[0047] When the damper control circuit is working normally, if the refrigerator needs to refrigerate / stop refrigerating the refrigerating chamber alone, the controller in the refrigerator outputs the driving signal representing the opening / closing of the damper to the damper control chip 200 and outputs the damper selection signal corresponding to the damper assembly of the refrigerating chamber to the damper driving circuit 300. At this time, the damper control chip 200 performs level conversion processing on the driving signal and outputs multiple driving levels corresponding to the number of square waves to each damper driving circuit 300. The damper driving circuit 300 receiving the damper selection signal is turned on and outputs the received multiple driving levels to the damper assembly of the refrigerating chamber to drive the damper assembly to open / close.

[0048] If the refrigerator needs to refrigerate / stop refrigerating the refrigerating chamber and the freezing chamber at the same time, the controller in the refrigerator outputs the driving signal representing the opening / closing of the damper to the damper control chip 200 and simultaneously outputs the damper selection signal to multiple damper driving circuits 300. At this time, the damper control chip 200 performs level conversion processing on the driving signal and outputs multiple driving levels corresponding to the number of square waves to each damper driving circuit 300. The multiple damper driving circuits 300 receiving the damper selection signal are all turned on and output the received multiple driving levels to the damper assemblies of the refrigerating chamber and the freezing chamber to drive multiple damper assemblies to open / close at the same time.

[0049] The technical scheme of the present application adopts the damper driving circuit 300, the input ends of multiple damper driving circuits 300 are connected with the same damper control chip 200, when the damper control chip 200 receives the driving signal, the driving level converted from the driving signal can simultaneously provide the driving level for multiple damper assemblies, and the controlled end of each damper driving circuit 300 is connected with the output end of a main controller, so that the main controller can individually select one damper driving circuit 300 to output, thereby realizing the control of multiple damper assemblies simultaneously by using only one damper control chip 200, and reducing the space occupation of the circuit.

[0050] With reference to Figure 2 In an embodiment, the damper assembly includes a first damper assembly and a second damper assembly; the number of damper control interfaces 100 is specifically two, including a first damper control interface 110 and a second damper control interface 120, and the number of damper driving circuits 300 is specifically two, including a first damper driving circuit 310 and a second damper driving circuit 320.

[0051] The multiple input ends of the first damper driving circuit 310 are electrically connected with the damper control chip 200 respectively, the output end of the first damper driving circuit 310 is electrically connected with the first damper control interface 110, the controlled end of the first damper driving circuit 310 is used for being connected with the first selection signal output end of the main controller, and the first damper driving circuit 310 is further used for controlling the first damper assembly to open / close according to the received multiple driving levels when receiving the first damper selection signal output by the main controller.

[0052] The multiple input ends of the second damper driving circuit 320 are electrically connected with the damper control chip 200 respectively, the output end of the second damper driving circuit 320 is electrically connected with the second damper control interface 120, the controlled end of the second damper driving circuit 320 is used for being connected with the second selection signal output end of the main controller, and the second damper driving circuit 320 is further used for controlling the second damper assembly to open / close according to the received multiple driving levels when receiving the second damper selection signal output by the main controller.

[0053] In the embodiment, the circuit composition of the first damper driving circuit 310 is the same as that of the second damper driving circuit 320.

[0054] When the damper control circuit is working normally, if it is required to drive the first damper assembly to work alone, the controller in the refrigerator outputs a driving signal representing the opening / closing of the damper to the damper control chip 200 and outputs a first damper selection signal to the first damper driving circuit 310, the damper control chip 200 performs level conversion processing on the driving signal and outputs a plurality of driving levels corresponding to the number of square waves to the first damper driving circuit 310 and the second damper driving circuit 320, at this time the first damper driving circuit 310 is turned on and outputs the received plurality of driving levels to the first damper assembly to drive the first damper assembly to open / close.

[0055] If the refrigerator needs to drive the first damper assembly and the second damper assembly to work simultaneously, the controller in the refrigerator outputs a driving signal representing the opening / closing of the damper to the damper control chip 200 and outputs a first damper selection signal to the first damper driving circuit 310 and a second damper selection signal to the second damper driving circuit 320. At this time, the damper control chip 200 performs level conversion processing on the driving signal and outputs a plurality of driving levels corresponding to the number of square waves to the first damper driving circuit 310 and the second damper driving circuit 320, at this time the first damper driving circuit 310 and the second damper driving circuit 320 are turned on and output the received plurality of driving levels to the first damper assembly and the second damper assembly to drive the first damper assembly and the second damper assembly to open / close simultaneously.

[0056] Referring to Figures 1-4 In an embodiment, the damper control interface 100 has a plurality of terminals, and the damper driving circuit 300 includes:

[0057] a plurality of driving branches 330, the input ends of the plurality of driving branches 330 are respectively electrically connected to the plurality of output ends of the damper control chip 200 one by one, the output ends of the plurality of driving branches 330 are respectively electrically connected to the plurality of terminals of the corresponding damper control interface 100 one by one, and the controlled ends of the plurality of driving branches 330 are all used to access the same damper selection signal;

[0058] The driving branch 330 is used to, when receiving the damper selection signal output by the main controller, cooperate with the remaining driving branches 330 in the damper driving circuit 300 to control the opening / closing of the corresponding group of damper assemblies.

[0059] In the embodiment, the number of driving branches 330 is determined by the number of windings in the driven damper assembly, and each driving branch 330 is used to drive one winding. When the number of windings in the damper assembly is 2 pairs, the number of driving branches 330 is 4.

[0060] When the damper control circuit is in normal operation, the damper control chip 200 outputs a driving level corresponding to the winding to a driving branch 330 corresponding to the winding, if the driving branch 330 receives a damper selection signal, the driving branch 330 is turned on, and the driving level is output to the corresponding winding, so that the winding works according to the driving level, if the driving branch 330 does not receive the damper selection signal, the driving branch 330 is turned off, and the corresponding winding cannot receive the driving level and does not work.

[0061] Optionally, the driving branch 330 comprises a first resistor R1, a second resistor R2, a first diode D1, a first switch tube Q1 and a second switch tube Q2.

[0062] The input end of the first switch tube Q1 is the input end of the driving branch 330, and is connected with the cathode of the first diode D1 and the first end of the first resistor R1 respectively, the output end of the first switch tube Q1 is the output end of the driving branch 330, and is connected with the anode of the second switch tube Q2, the controlled end of the first switch tube Q1 is connected with the second end of the first resistor R1 and the first end of the second resistor R2 respectively, the controlled end of the second switch tube Q2 is the controlled end of the driving branch 330, the input end of the second switch tube Q2 is connected with the second end of the second resistor R2, and the output end of the second switch tube Q2 is grounded.

[0063] In the embodiment of the application, the first switch tube Q1 and the second switch tube Q2 are at least one of MOS tubes or triodes.

[0064] Specifically, when the damper control chip 200 outputs a plurality of driving levels, the input end of each first switch tube Q1 receives a corresponding driving level, if the controlled end of the second switch tube Q2 in a driving branch 330 receives a damper selection signal, the second switch tube Q2 is turned on, the controlled end of the first switch tube Q1 is pulled down, at this time, the first switch tube Q1 is turned on due to the controlled end being pulled down, the driving level is output to the corresponding winding, so that the winding works according to the driving level, on the contrary, if the controlled end of the second switch tube Q2 in a driving branch 330 does not receive a damper selection signal, the second switch tube Q2 is turned off, at this time, the first resistor R1 as a pull-up resistor pulls up the controlled end of the first switch tube Q1, so that the first switch tube Q1 is turned off, and the corresponding winding cannot receive the driving level and does not work.

[0065] Optionally, the damper control circuit further comprises:

[0066] A current-limiting resistor Ra, a first end of the current-limiting resistor Ra is connected with an output end of the damper control chip 200 and an input end of the drive branch 330 respectively, and a second end of the current-limiting resistor Ra is grounded, for limiting the drive level output by the damper control chip 200.

[0067] Optionally, the damper control circuit further comprises:

[0068] A filter capacitor Ca, a first end of the filter capacitor Ca is connected with the first end of the current-limiting resistor Ra, the output end of the damper control chip 200 and the input end of the drive branch 330 respectively, and a second end of the filter capacitor Ca is grounded, for filtering the drive level output by the damper control chip 200.

[0069] It should be noted that, as Figure 5 As shown in the prior art, a damper driving scheme is proposed, which is composed of multiple triodes and cooperates with an MCU (main controller), however, in the driving scheme, each controlled end of each damper component needs a corresponding drive circuit, and each drive circuit is connected with an I / O port of the MCU, which makes the occupation of the I / O of the MCU very large when the number of the damper components to be driven is large, resulting in the waste of the I / O port resources.

[0070] The application further provides a damper system, comprising a damper component, a main controller and the damper control circuit.

[0071] The input end and the controlled end of the damper control circuit are connected with the main controller respectively, and the controlled end of the damper component is connected with the output end of the damper control circuit.

[0072] In the embodiment, each drive circuit in the damper control circuit only has a controlled end connected with the main controller, and the main controller only needs to be connected with one damper control chip 200, without the need of outputting multiple drive levels to multiple damper control chips 200, thereby greatly reducing the occupation of the I / O.

[0073] In an embodiment, the damper system further comprises:

[0074] A voltage reduction circuit, an input end of the voltage reduction circuit is used for connecting a direct current power supply, an output end of the voltage reduction circuit is connected with a power supply end of the main controller, and the voltage reduction circuit is used for reducing and stabilizing the connected direct current power supply and then supplying power to the main controller.

[0075] In the embodiment, the voltage reduction circuit can adopt an LDO voltage reduction chip, or other voltage reduction schemes such as a BUCK voltage reduction circuit.

[0076] In the working process of the damper system, the voltage reducing circuit connects the rectified and voltage-reduced DC power supply to further reduce the DC power supply, and the output voltage after the voltage reduction is determined by the power supply voltage of the main controller. The voltage reducing circuit reduces the DC voltage to the power supply voltage value of the main controller and outputs it to the main controller for power supply.

[0077] The application also provides a refrigerator comprising the above-mentioned damper system, or comprising a damper assembly, a main controller and the above-mentioned damper control circuit. The specific structure of the damper control circuit is referred to the above-mentioned embodiments. Since the system adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0078] The above-mentioned is only the optional embodiment of the application, and does not limit the patent scope of the application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like made under the inventive concept of the application and according to the content of the specification and drawings of the application is included in the patent protection scope of the application.

Claims

1. A damper control circuit applied to a refrigerator, the refrigerator comprising a plurality of damper assemblies and a main controller, characterized in that, The damper control circuit comprises: a plurality of damper control interfaces, each of the plurality of damper control interfaces being electrically connected to a controlled end of a corresponding one of the plurality of damper assemblies, the damper control interface having a plurality of terminals; a damper control chip, an input end of the damper control chip being electrically connected to the main controller, the damper control chip being configured to perform level conversion processing on a driving signal output by the main controller and output corresponding driving levels; a plurality of damper driving circuits, each of the plurality of damper driving circuits having an input end electrically connected to the damper control chip, an output end electrically connected to a corresponding one of the plurality of damper control interfaces, and a controlled end electrically connected to the main controller, each of the damper driving circuits being configured to control a corresponding group of the damper assemblies to open / close according to the received driving levels when receiving a damper selection signal output by the main controller; each of the damper driving circuits comprises a plurality of driving branches, each of the plurality of driving branches having an input end electrically connected to a corresponding one of the plurality of output ends of the damper control chip, an output end electrically connected to a corresponding one of the plurality of terminals of the corresponding damper control interface, and a controlled end electrically connected to the same damper selection signal; each of the driving branches is configured to, in cooperation with the remaining driving branches in the damper driving circuit, control a corresponding group of the damper assemblies to open / close when receiving the damper selection signal output by the main controller.

2. The damper control circuit of claim 1, wherein, The damper assemblies comprise a first damper assembly and a second damper assembly; the number of the damper control interfaces is two, including a first damper control interface and a second damper control interface; and the number of the damper driving circuits is two, including a first damper driving circuit and a second damper driving circuit. The plurality of input ends of the first damper driving circuit are electrically connected to the damper control chip, the output end of the first damper driving circuit is electrically connected to the first damper control interface, the controlled end of the first damper driving circuit is electrically connected to a first selection signal output end of the main controller, and the first damper driving circuit is further configured to control the first damper assembly to open / close according to the received driving levels when receiving a first damper selection signal output by the main controller. The plurality of input ends of the second damper driving circuit are electrically connected to the damper control chip, the output end of the second damper driving circuit is electrically connected to the second damper control interface, the controlled end of the second damper driving circuit is electrically connected to a second selection signal output end of the main controller, and the second damper driving circuit is further configured to control the second damper assembly to open / close according to the received driving levels when receiving a second damper selection signal output by the main controller.

3. The damper control circuit of claim 1, wherein, The driving branch comprises a first resistor, a second resistor, a first diode, a first switch tube, and a second switch tube. The input end of the first switch tube is the input end of the drive branch, and is connected with the cathode of the first diode and the first end of the first resistor respectively, the output end of the first switch tube is the output end of the drive branch, and is connected with the anode of the second switch tube, the controlled end of the first switch tube is connected with the second end of the first resistor and the first end of the second resistor respectively, the controlled end of the second switch tube is the controlled end of the drive branch, the input end of the second switch tube is connected with the second end of the second resistor, and the output end of the second switch tube is grounded.

4. The damper control circuit of claim 3, wherein, The first switch tube and the second switch tube are at least one of MOS tubes or triodes.

5. The damper control circuit of claim 1, wherein, The damper control circuit further comprises: The first end of the current-limiting resistor is connected with one output end of the damper control chip and one input end of the drive branch respectively, and the second end of the current-limiting resistor is grounded, so as to limit the drive level output by the damper control chip.

6. The damper control circuit of claim 5, wherein, The damper control circuit further comprises: The first end of the filter capacitor is connected with the first end of the current-limiting resistor, one output end of the damper control chip and one input end of the drive branch respectively, and the second end of the filter capacitor is grounded, so as to filter the drive level output by the damper control chip.

7. A damper system characterized by, The damper system comprises a damper assembly, a main controller and the damper control circuit according to any one of claims 1-6. The input end and the controlled end of the damper control circuit are connected with the main controller respectively, and the controlled end of the damper assembly is connected with the output end of the damper control circuit.

8. The damper system of claim 7, wherein, The damper system further comprises: The input end of the voltage reduction circuit is used for connecting a direct current power supply, the output end of the voltage reduction circuit is connected with the power supply end of the main controller, and the voltage reduction circuit is used for reducing and stabilizing the connected direct current power supply and then supplying power to the main controller.

9. A refrigerator characterized by comprising: The damper system comprises the damper system according to claim 7, or the damper assembly, the main controller and the damper control circuit according to any one of claims 1-6.

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