Power switching circuit, display control board test system and refrigerator

Abstract

The embodiment of the utility model provides a power supply switching circuit, a display control board test system and a refrigerator, and the power supply switching circuit comprises a connecting piece which is used for being connected with a first power supply; and the conversion module is respectively connected with the connecting piece, a second power supply and the display control board, and the conversion module is used for switching the display control board to be connected with the first power supply when the connecting piece is connected with the first power supply. The display control board can be conveniently tested by adopting the second power supply to supply power to the display control board under the condition that the power supply voltage is not influenced, and the first power supply is connected to supply power when the power supply is insufficient, so that the power utilization requirement during the display control board test can be met.

Description

Technical Field

[0001] This application belongs to the field of refrigerator technology, and particularly relates to a power switching circuit, a display and control board testing system, and a refrigerator. Background Technology

[0002] When using a smart communication pass-through tool, the refrigerator display and control board is powered by a computer's USB port. Typically, the maximum USB power supply current is 500mA, which is sufficient for the board's requirements. However, when the display and control board has a Wi-Fi module and the network configuration process is under heavy load, the USB output current fails to meet the testing requirements. Utility Model Content

[0003] This application provides a power switching circuit, a display and control board testing system, and a refrigerator, which can meet the power requirements during display and control board testing.

[0004] In a first aspect, embodiments of this application provide a power switching circuit for powering a display control board; the power switching circuit includes:

[0005] Connector for connection to the first power source;

[0006] A conversion module is connected to the connector, the second power supply, and the display control board respectively. The conversion module is used to switch the display control board to be connected to the first power supply when the connector is connected to the first power supply.

[0007] Optionally, the conversion module includes:

[0008] A switching transistor, wherein the first terminal of the switching transistor is grounded and the second terminal of the switching transistor is connected to the second power supply;

[0009] A diode, the positive terminal of which is connected to the connector, and the negative terminal of which is connected to the third terminal of the switching transistor and the display and control board.

[0010] Optionally, the conversion module further includes:

[0011] A first resistor, one end of which is connected to the first terminal of the switching transistor and the positive terminal of the diode, and the other end of which is grounded;

[0012] A first capacitor, one end of which is connected to the positive terminal of the diode, and the other end of which is grounded.

[0013] Optionally, the power switching circuit further includes:

[0014] An indicator module is connected to the third terminal of the switching transistor, and the indicator module is used to provide an indication when the first power supply or the second power supply is powered.

[0015] Optionally, the indication module includes:

[0016] The second resistor, one end of which is connected to the third terminal of the switching transistor and the display and control board;

[0017] A light-emitting diode, one end of which is connected to the other end of the second resistor, and the other end of which is grounded.

[0018] Optionally, the power switching circuit further includes:

[0019] A filtering module is connected between the third terminal of the switching transistor and the display and control board. The filtering module is used to filter the power supply voltage input by the first power supply or the second power supply.

[0020] Optionally, the filtering module includes:

[0021] The second capacitor has one end connected to the third terminal of the switching transistor and the display control board, and the other end of the second capacitor is grounded.

[0022] A third capacitor, one end of which is connected to one end of the second capacitor, and the other end of which is grounded.

[0023] Optionally, the switching transistor is a MOSFET, the first terminal of the switching transistor is the gate of the MOSFET, the second terminal of the switching transistor is the drain of the MOSFET, and the third terminal of the switching transistor is the source of the MOSFET.

[0024] Secondly, embodiments of this application also provide a display control board testing system, comprising:

[0025] The power switching circuit as described in any of the preceding items;

[0026] The display and control board is connected to the power switching circuit.

[0027] Thirdly, embodiments of this application also provide a refrigerator, including the display and control board testing system described above.

[0028] In the power switching circuit, display control board testing system, and refrigerator of this application embodiment, the display control board can be conveniently tested by using a second power supply to power the display control board without affecting the power supply voltage. When the power supply is insufficient, the first power supply can be connected to provide power, which can meet the power requirements of the display control board during testing. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0030] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0031] Figure 1 This is a structural block diagram of a power switching circuit provided in an embodiment of this application.

[0032] Figure 2 A circuit diagram of a power switching circuit provided in an embodiment of this application.

[0033] Figure 3 Another structural block diagram of the power switching circuit provided in the embodiments of this application.

[0034] Figure 4 Another circuit diagram of the power switching circuit provided in the embodiments of this application. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0036] To meet the power requirements during refrigerator display and control board testing, this application provides a power switching circuit, a display and control board testing system, and a refrigerator, which will be described below in conjunction with the accompanying drawings.

[0037] like Figure 1 , Figure 1 This is a structural block diagram of a power switching circuit provided in an embodiment of this application. This application provides a power switching circuit 100 for powering a display control board 200. The power switching circuit 100 includes a connector 110 and a conversion module 120.

[0038] Connector 110 can be understood as a device on a circuit board with connection ports. Connector 110 may have multiple connection ports for connecting to different components. For example, one connection port DC of connector 110 is used to connect to an external source, such as a first power supply. Another connection port GND of connector 110 is used for grounding.

[0039] The conversion module 120 is connected to the connector 110, the second power supply DC2, and the display and control board 200. The conversion module 120 is used to switch the display and control board 200 to be connected to the first power supply when the connector 110 is connected to the first power supply. The conversion module 120 is connected to the connection port of the connector 110 that is different from the connection port of the first power supply and the connection port that is grounded.

[0040] In the power switching circuit 100 provided in this application embodiment, the second power supply DC2 is used to power the display control board 200 without affecting the power supply voltage, which can facilitate the testing of the display control board 200. When the power supply is insufficient, the first power supply is connected to provide power, which can meet the power requirements of the display control board 200 during testing.

[0041] It should be noted that during the testing of the display control board 200, such as when using a communication intelligent pass-through tool, it is usually powered by the computer's USB port. That is, the second power supply DC2 can be understood as a power source powered through the computer's USB port. Typically, the maximum USB supply current is 500mA, which is sufficient to meet the power requirements when the communication intelligent pass-through tool interacts with the display control board 200. However, if the display control board 200 has a WIFI module and the load is too high during network configuration, the USB output current may not meet the testing requirements. In this case, this embodiment can use a first power supply, i.e., an external independent power supply, to meet the power requirements of the display control board 200 during testing. In other words, in this embodiment, the supply current of the first power supply is greater than that of the second power supply DC2. When testing requires, the power supply to the display control board 200 can be switched from the second power supply DC2 to the first power supply.

[0042] In other embodiments, the supply current of the first power supply may be equal to that of the second power supply DC2, or the supply current of the first power supply may be less than that of the second power supply DC2. In this case, the second power supply DC2, such as USB power from a computer, can be used preferentially. If the second power supply DC2 fails or is otherwise unavailable, the first power supply, such as an external independent power supply, can be used as a supplement or replacement to power the display control board 200, thereby improving the flexibility of powering the display control board 200 and facilitating testing of the display control board 200.

[0043] For example, please refer to Figure 1 And see Figure 2 As shown, Figure 2 This is a circuit diagram of a power switching circuit provided in an embodiment of this application. The conversion module 120 includes a switching transistor Q1, a diode D1, a first resistor R1, and a first capacitor C1.

[0044] The first terminal of the switching transistor Q1 is grounded to GND, and the second terminal of the switching transistor Q1 is connected to the second power supply DC2.

[0045] The positive terminal of diode D1 is connected to connector 110, and the negative terminal of diode D1 is connected to the third terminal of switch Q1 and display control board 200.

[0046] One end of the first resistor R1 is connected to the first terminal of the switching transistor Q1 and the positive terminal of the diode D1, and the other end of the first resistor R1 is grounded to GND.

[0047] One end of the first capacitor C1 is connected to the positive terminal of the diode D1, and the other end of the first capacitor C1 is grounded to GND. The first capacitor C1 serves to protect the circuit.

[0048] For example, the switching transistor Q1 can be a MOSFET such as a PMOS transistor. In this case, the first terminal of the switching transistor Q1 is the gate of the MOSFET, the second terminal of the switching transistor Q1 is the drain of the MOSFET, and the third terminal of the switching transistor Q1 is the source of the MOSFET. In this case, the cooperation between the switching transistor Q1 and the diode D1 can switch the power supply of the display control board 200 between the first power supply and the second power supply DC2.

[0049] For example, when the first power supply is not connected, that is, when the first power supply is not connected to the connector 110, the second power supply DC2 can be 5V. The gate of the switching transistor Q1, that is, the first terminal, is grounded to GND through the first resistor R1, so the gate voltage of the switching transistor Q1 is 0V. The drain of the switching transistor Q1, that is, the second terminal, is connected to the source of the switching transistor Q1, that is, the third terminal, through its internal freewheeling diode. The source voltage of the switching transistor Q1, that is, the voltage of the third terminal, is 5V-0.7V=4.3V. At this time, the switching transistor Q1 is turned on, that is, the second power supply DC2 is connected to the display control board 200.

[0050] When the first power supply is connected to connector 110, the voltage to the display control board 200 through diode D1 can be, for example, 5V - 0.7V = 4.3V. The gate voltage (i.e., the first terminal voltage) of switch Q1 becomes the 5V voltage of the second power supply DC2. At this time, switch Q1 is cut off, and the source and drain (i.e., the third and second terminals) of switch Q1 are not connected. The first power supply is then connected to the display control board 200.

[0051] Please see Figure 3 and Figure 4 , Figure 3 This is another structural block diagram of the power switching circuit provided in the embodiments of this application. Figure 4 Another circuit diagram of the power switching circuit provided in the embodiments of this application.

[0052] In order to ensure the reliability of the operation of the first power supply and the second power supply DC2, the power switching circuit 100 of this application embodiment also includes an indicator module 130. The indicator module 130 is connected to the third terminal of the switching transistor Q1. The indicator module 130 is used to indicate when the first power supply or the second power supply DC2 is powered, such as reminding the user that the first power supply can be powered normally, or reminding the user that the second power supply DC2 can be powered normally.

[0053] For example, the indicator module 130 includes a second resistor R2 and a light-emitting diode DL1. One end of the second resistor R2 is connected to the third terminal of the switching transistor Q1 and the display control board 200. One end of the light-emitting diode DL1 is connected to the other end of the second resistor R2, and the other end of the light-emitting diode DL1 is grounded to GND. For example, when the first power supply or the second power supply is powered, the light-emitting diode DL1 illuminates, and the user can determine whether the first power supply or the second power supply DC2 is normal based on the illumination of the light-emitting diode DL1.

[0054] To ensure the stability of the voltage signal, the power switching circuit 100 of this application embodiment further includes a filtering module 140. The filtering module 140 is connected between the third terminal of the switching transistor Q1 and the display and control board 200. The filtering module 140 is used to filter the power supply voltage input by the first power supply or the second power supply DC2 to remove noise in the circuit, so that the voltage signal input to the display and control board 200 is more stable.

[0055] For example, the filter module 140 includes a second capacitor C2 and a third capacitor C3. One end of the second capacitor C2 is connected to the third terminal of the switching transistor Q1 and the display and control board 200, and the other end of the second capacitor C2 is grounded to GND. The second capacitor C2 can be an electrolytic capacitor, which can filter and stabilize the current and improve circuit performance. One end of the third capacitor C3 is connected to one end of the second capacitor C2, and the other end of the third capacitor C3 is grounded to GND.

[0056] In the power switching circuit 100 provided in this application embodiment, the display control board 200 can be conveniently tested by using the second power supply DC2 to power the display control board 200 without affecting the power supply voltage. USB power supply is more convenient. When the power supply is insufficient, the first power supply can be connected to provide power, which can meet the power requirements of the display control board 200 during testing.

[0057] To better implement the technical solution of this application, this application embodiment also provides a testing system for a display control board. The display control board, also known as a display control circuit board, can process data via external inputs such as a user touchscreen display and communicate with the main control board, thereby controlling the product in which the display control board is applied. The display control board can be used in refrigerators or washing machines, for example. The display control board testing system includes the aforementioned power switching circuit and the display control board. During testing, the display control board can be connected to the power switching circuit.

[0058] In some embodiments, the power switching circuitry may be integrated into the display control board for use when testing the display control board.

[0059] In some other embodiments, the power switching circuit can be integrated into the intelligent communication pass-through tool. That is, when testing the display control board, the power supply to the display control board can be switched through the intelligent communication pass-through tool, thereby saving the space occupied by the display control board.

[0060] The specific structure of the power switching circuit is as described in the above embodiments and will not be repeated here. Since this display and control board test system adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be repeated here.

[0061] This application also provides a refrigerator that includes the above-described display and control board testing system. Since this refrigerator adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0062] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0063] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0064] The power switching circuit, display and control board testing system, and refrigerator provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A power switching circuit, used for powering a display control board; characterized in that, The power switching circuit includes: Connector for connection to the first power source; A conversion module is connected to the connector, the second power supply, and the display control board, respectively. The conversion module is used to switch the display control board to be connected to the first power supply when the connector is connected to the first power supply. The conversion module includes: A switching transistor, wherein the first terminal of the switching transistor is grounded and the second terminal of the switching transistor is connected to the second power supply; A diode, the positive terminal of which is connected to the connector, and the negative terminal of which is connected to the third terminal of the switching transistor and the display and control board.

2. The power switching circuit according to claim 1, characterized in that, The conversion module also includes: A first resistor, one end of which is connected to the first terminal of the switching transistor and the positive terminal of the diode, and the other end of which is grounded; A first capacitor, one end of which is connected to the positive terminal of the diode, and the other end of which is grounded.

3. The power switching circuit according to claim 1, characterized in that, The power switching circuit also includes: An indicator module is connected to the third terminal of the switching transistor, and the indicator module is used to provide an indication when the first power supply or the second power supply is powered.

4. The power switching circuit according to claim 3, characterized in that, The indication module includes: The second resistor, one end of which is connected to the third terminal of the switching transistor and the display and control board; A light-emitting diode, one end of which is connected to the other end of the second resistor, and the other end of which is grounded.

5. The power switching circuit according to claim 1, characterized in that, The power switching circuit also includes: A filtering module is connected between the third terminal of the switching transistor and the display and control board. The filtering module is used to filter the power supply voltage input by the first power supply or the second power supply.

6. The power switching circuit according to claim 5, characterized in that, The filtering module includes: The second capacitor has one end connected to the third terminal of the switching transistor and the display control board, and the other end of the second capacitor is grounded. A third capacitor, one end of which is connected to one end of the second capacitor, and the other end of which is grounded.

7. The power switching circuit according to claim 1, characterized in that, The switching transistor is a MOS transistor, the first terminal of the switching transistor is the gate of the MOS transistor, the second terminal of the switching transistor is the drain of the MOS transistor, and the third terminal of the switching transistor is the source of the MOS transistor.

8. A display and control board testing system, characterized in that, include: The power switching circuit as described in any one of claims 1 to 7; The display and control board is connected to the power switching circuit.

9. A refrigerator, characterized in that, Includes the display and control board testing system as described in claim 8.

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