A switching power supply circuit and a refrigerator

Abstract

The present invention discloses a switching power supply circuit and a refrigerator. The switching power supply circuit includes: a power supply; a main control chip provided with a power supply terminal and an input terminal, the power supply terminal being adapted to supply power to the deodorizing device, and the input terminal being adapted to receive a supply voltage; a first switching circuit, a control terminal of the first switching circuit being configured to receive a control instruction, a first end of the first switching circuit being connected to the power supply, and a second end of the first switching circuit being connected to the input terminal; the first switching circuit controls the on / off of the first end and the second end of the first switching circuit according to the control instruction. With such a setting, the problem of power failure of the deodorizing device is solved, ensuring that the user can normally use the refrigerator deodorizing device and saving a large amount of electric energy.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerators, and particularly relates to a switching power supply circuit and a refrigerator. Background Art

[0002] Currently, a refrigerator deodorizing device is usually arranged inside a refrigerator. The refrigerator deodorizing device is internally provided with an ozone generator, which can generate ozone and has the functions of strong sterilization and odor elimination.

[0003] The refrigerator deodorizing device needs to be powered by a battery. Usually, during the process from the production of the refrigerator to the sale to customers, the battery of the refrigerator deodorizing device is always in a powered state, wasting a large amount of electric energy and reducing the effective use time of users. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is the problem that the battery of the refrigerator deodorizing device in the prior art is always in a powered state, wasting a large amount of electric energy, so as to provide a switching power supply circuit and a refrigerator.

[0005] To achieve the above object, an embodiment of the present invention provides a switching power supply circuit, which includes: a power supply; a main control chip provided with a power supply terminal and an input terminal, the power supply terminal being adapted to supply power to a deodorizing device, and the input terminal being adapted to access a supply voltage; a first switching circuit, a control terminal of the first switching circuit being used for receiving a control instruction, a first end of the first switching circuit being connected to the power supply, and a second end of the first switching circuit being connected to the input terminal; the first switching circuit controls the on / off of the first end and the second end of the first switching circuit according to the control instruction.

[0006] Optionally, the main control chip further includes an output terminal for outputting a control signal.

[0007] Optionally, the switching power supply circuit further includes:

[0008] a second switching circuit, a control terminal of the second switching circuit being connected to the output terminal of the main control chip, a first end of the second switching circuit being connected to the power supply, and a second end of the second switching circuit being connected to the input terminal; the second switching circuit controls the on / off of the first end and the second end of the second switching circuit according to the control signal.

[0009] Optionally, the switching power supply circuit further includes: a key switch connected to the control end of the first switching circuit, where the key switch is used to output the control instruction; when the key switch is closed, the first end and the second end of the first switching circuit are conducted; when the key switch is open, the first end and the second end of the first switching circuit are disconnected.

[0010] Optionally, the power supply is any one of commercial power, a storage battery, or a dry battery.

[0011] Optionally, the first switching circuit includes: a first switching tube, the control end of the first switching tube is used to receive the control instruction, and the first end of the first switching tube is grounded; a second switching tube, the control end of the second switching tube is connected to the second end of the first switching tube, the first end of the second switching tube is connected to the power supply, and the second end of the second switching tube is connected to the input end; when the first switching tube is conducted, the second switching tube is conducted; when the first switching tube is cut off, the second switching tube is cut off.

[0012] Optionally, the first switching circuit further includes: a first resistor, one end of the first resistor is connected to the control end of the first switching tube, and the other end of the first resistor is used to receive the control instruction; a second resistor, one end of the second resistor is connected to the control end of the first switching tube, and the other end of the second resistor is grounded; a third resistor, one end of the third resistor is connected to the second end of the first switching tube, and the other end of the third resistor is connected to the control end of the second switching tube.

[0013] Optionally, the second switching circuit includes: a third switching tube, the control end of the third switching tube is connected to the output end of the main control chip, and the first end of the third switching tube is grounded; a fourth switching tube, the control end of the fourth switching tube is connected to the second end of the third switching tube, the first end of the fourth switching tube is connected to the power supply, and the second end of the fourth switching tube is connected to the input end; when the third switching tube is conducted, the fourth switching tube is conducted; when the third switching tube is cut off, the fourth switching tube is cut off.

[0014] Optionally, the second switching circuit further includes: a fourth resistor, one end of the fourth resistor is connected to the control end of the third switching tube, and the other end of the fourth resistor is used to receive the control instruction; a fifth resistor, one end of the fifth resistor is connected to the control end of the third switching tube, and the other end of the fifth resistor is grounded; a sixth resistor, one end of the sixth resistor is connected to the second end of the third switching tube, and the other end of the sixth resistor is connected to the control end of the fourth switching tube.

[0015] An embodiment of the present invention also provides a refrigerator, which includes: an odor removal device; a switching power supply circuit as described in any of the above embodiments, provided with the main control chip, and the main control chip is connected to the odor removal device through a power supply terminal.

[0016] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0017] 1. An embodiment of the present invention provides a switching power supply circuit, which includes: a power supply; a main control chip, provided with a power supply terminal and an input terminal, the power supply terminal is adapted to supply power to the odor removal device, and the input terminal is adapted to access a supply voltage; a first switching circuit, the control terminal of the first switching circuit is used to receive a control instruction, the first end of the first switching circuit is connected to the power supply, and the second end of the first switching circuit is connected to the input terminal; the first switching circuit controls the on and off of the first end and the second end of the first switching circuit according to the control instruction.

[0018] With such a setting, when the switching power supply circuit is not working, since the control terminal of the first switching circuit does not receive a control instruction, the first switching circuit remains in an off state, so that the power supply does not supply power to the main control chip. Because the main control chip is not powered on, it will not supply power to the odor removal device through its own power supply terminal, thus solving the problem of the odor removal device being out of power, ensuring that the user can normally use the refrigerator odor removal device, saving a large amount of electric energy, and reducing the effective use time of the user.

[0019] 2. By setting a second switching circuit in the embodiment of the present invention, when the first switching circuit is turned on, the main control chip sends a control signal to the control terminal of the second switching circuit, and the second switching circuit can conduct the power supply and the main control chip through the control line of the main control chip, thereby realizing the self-locking function of the switching power supply circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the switching power supply circuit in the embodiment of the present invention.

[0022] Reference Numerals:

[0023] VBAT, power supply; VCC, input terminal; Q1, first switch tube; Q2, second switch tube; Q3, third switch tube; Q4, fourth switch tube; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary workers in the field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, 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, it can also be the internal communication of two components, it can be a wireless connection, or it can be a wired connection. For ordinary workers in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] At present, refrigerators are usually equipped with refrigerator deodorization devices. The refrigerator deodorization device has a built-in ozone generator that can generate ozone, which has a strong sterilization and odor elimination effect. The refrigerator deodorization device needs to be powered by a battery. In general, from the time the refrigerator is produced to the time it is sold to the customer, the battery of the refrigerator deodorization device is always in a powered state, wasting a lot of electricity and reducing the user's effective use time.

[0029] Therefore, the technical problem to be solved by the present invention is that the battery of the refrigerator deodorizing device in the prior art has been in a power supply state all the time, wasting a large amount of electric energy. Thus, a switching power supply circuit and a refrigerator are provided.

[0030] Embodiment 1

[0031] As Figure 1 shown, an embodiment of the present invention provides a switching power supply circuit, which includes: a power supply VBAT, a main control chip, and a first switching circuit. The power supply VBAT is used to provide electric energy.

[0032] Specifically, in the embodiment of the present invention, the main control chip is provided with a power supply terminal and an input terminal VCC. The power supply terminal is suitable for supplying power to the deodorizing device, and the input terminal VCC is suitable for accessing a supply voltage. The control terminal of the first switching circuit is used to receive a control instruction. The first end of the first switching circuit is connected to the power supply VBAT, and the second end of the first switching circuit is connected to the input terminal VCC. The first switching circuit controls the on / off of the first end and the second end of the first switching circuit according to the control instruction.

[0033] With such a setting, when the switching power supply circuit does not start to work, since the control terminal of the first switching circuit does not receive a control instruction, the first switching circuit remains in an off state. Thus, the power supply VBAT does not supply power to the main control chip, and the main control chip does not supply power to the deodorizing device through its own power supply terminal because it is not powered on. Furthermore, the problem of the deodorizing device running out of power is solved, ensuring that the user can normally use the refrigerator deodorizing device, saving a large amount of electric energy, and reducing the effective use time of the user.

[0034] In an optional embodiment of the present invention, the main control chip further includes an output terminal, and the output terminal is used to output a control signal. The control signal can be a PWM signal, and the PWM signal includes a high-level signal and a low-level signal.

[0035] Further, in an embodiment of the present invention, the switching power supply circuit further includes a second switching circuit. The control terminal of the second switching circuit is connected to the output terminal of the main control chip. The first end of the second switching circuit is connected to the power supply VBAT, and the second end of the second switching circuit is connected to the input terminal VCC. The second switching circuit controls the on / off of the first end and the second end of the second switching circuit according to the control signal.

[0036] In an embodiment of the present invention, by providing a second switch circuit, when the first switch circuit is turned on, the main control chip sends a control signal to the control terminal of the second switch circuit, and the second switch circuit can connect the power supply VBAT to the main control chip through the control line of the main control chip. In this way, even if the control terminal of the first switch circuit does not receive a control instruction, the first switch circuit can still ensure that the input terminal VCC of the main control chip is powered on, so that the main control chip can work normally, realizing the self-locking function of the circuit.

[0037] Further, in an embodiment of the present invention, the switching power supply circuit further includes a key switch, which is connected to the control terminal of the first switch circuit, and the key switch is used to output the control instruction. When the key switch is closed, the first end and the second end of the first switch circuit are turned on; when the key switch is open, the first end and the second end of the first switch circuit are turned off. When the key switch is not pressed, the control instruction is at a low level and the first switch circuit is not turned on. After pressing the key switch, the control instruction is at a high level and the first switch circuit is turned on, and the power supply VBAT supplies power to the main control chip.

[0038] Optionally, in an embodiment of the present invention, the power supply VBAT is any one of commercial power, a storage battery or a dry battery.

[0039] In an alternative embodiment of the present invention, the first switch circuit includes a first switching transistor Q1 and a second switching transistor Q2. The control terminal of the first switching transistor Q1 is used to receive the control instruction, and the first end of the first switching transistor Q1 is grounded. The control terminal of the second switching transistor Q2 is connected to the second end of the first switching transistor Q1. The first end of the second switching transistor Q2 is connected to the power supply VBAT, and the second end of the second switching transistor Q2 is connected to the input terminal VCC. Specifically, when the first switching transistor Q1 is turned on, the second switching transistor Q2 is turned on; when the first switching transistor Q1 is turned off, the second switching transistor Q2 is turned off.

[0040] Further, in an embodiment of the present invention, the first switch circuit further includes: a first resistor R1, a second resistor R2, and a third resistor R3. One end of the first resistor R1 is connected to the control end of the first switch transistor Q1, and the other end of the first resistor R1 is used to receive the control instruction. One end of the second resistor R2 is connected to the control end of the first switch transistor Q1, and the other end of the second resistor R2 is grounded. One end of the third resistor R3 is connected to the second end of the first switch transistor Q1, and the other end of the third resistor R3 is connected to the control end of the second switch transistor Q2. The types of the first resistor R1 and the second resistor R2 should be selected to ensure that the first switch transistor Q1 is saturated and conducting, and the type of the third resistor R3 should be selected to ensure that the second switch transistor Q2 is saturated and conducting. The types of the first switch transistor Q1 and the second switch transistor Q2 should meet the circuit requirements, for example, the current selection.

[0041] Further, in an embodiment of the present invention, the second switch circuit includes: a third switch transistor Q3 and a fourth switch transistor Q4. The control end of the third switch transistor Q3 is connected to the output end of the main control chip, and the first end of the third switch transistor Q3 is grounded. The control end of the fourth switch transistor Q4 is connected to the second end of the third switch transistor Q3. The first end of the fourth switch transistor Q4 is connected to the power supply VBAT, and the second end of the fourth switch transistor Q4 is connected to the input end VCC. When the third switch transistor Q3 is conducting, the fourth switch transistor Q4 is conducting; when the third switch transistor Q3 is cutoff, the fourth switch transistor Q4 is cutoff.

[0042] The first switch transistor Q1 and the second switch transistor Q2, the third switch transistor Q3 and the fourth switch transistor Q4 can be any one of a triode, a MOS transistor, and a field effect transistor. Of course, this embodiment is only an example of the types of the first switch transistor Q1 and the second switch transistor Q2, the third switch transistor Q3 and the fourth switch transistor Q4, but it is not limited thereto. Those skilled in the art can change it according to the actual situation as long as the same technical effects can be achieved.

[0043] In an optional embodiment of the present invention, the second switch circuit further includes a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6, one end of the fourth resistor R4 is connected to the control end of the third switch tube Q3, and the other end of the fourth resistor R4 is used to receive the control instruction. One end of the fifth resistor R5 is connected to the control end of the third switch tube Q3, and the other end of the fifth resistor R5 is grounded. One end of the sixth resistor R6 is connected to the second end of the third switch tube Q3, and the other end of the sixth resistor R6 is connected to the control end of the fourth switch tube Q4. The selection of the fourth resistor R4 and the fifth resistor R5 should be able to ensure that the third switch tube Q3 is saturated and turned on, and the selection of the sixth resistor R6 should be able to ensure that the fourth switch tube Q4 is saturated and turned on. The selection of the third switch tube Q3 and the fourth switch tube Q4 should meet the circuit requirements, such as current selection.

[0044] Example 2

[0045] An embodiment of the present invention further provides a refrigerator, comprising: a deodorizing device; a switching power supply circuit as described in any of the above embodiments, provided with the main control chip, and the main control chip is connected to the deodorizing device via a power supply terminal.

[0046] With such arrangement, when the switching power supply circuit does not start working, since the control end of the first switching circuit has not received the control instruction, the first switching circuit remains in the disconnected state, and thus the power supply VBAT will not supply power to the main control chip. Since the main control chip is not powered on, it will not supply power to the deodorization device through its own power supply end, thereby solving the problem of the deodorization device running out of power, ensuring that the user can use the refrigerator deodorization device normally and saving a lot of electricity.

[0047] Moreover, when the refrigerator is turned off, the output terminal of the main control chip outputs a low level, the third switch tube Q3 is turned off, and the fourth switch tube Q4 is also turned off. The supply voltage of the input terminal VCC of the main control chip drops to 0, and the main control chip does not work. In this way, the battery has no power consumption circuit.

[0048] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For ordinary workers in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A switching power supply circuit, characterized in that, it includes: a power supply (VBAT); a main control chip, provided with a power supply terminal and an input terminal (VCC), the power supply terminal is adapted to supply power to the deodorization device, and the input terminal (VCC) is adapted to access a supply voltage; a first switching circuit, the control terminal of the first switching circuit is used to receive a control instruction, the first end of the first switching circuit is connected to the power supply (VBAT), and the second end of the first switching circuit is connected to the input terminal (VCC); the first switching circuit controls the on / off of the first end and the second end of the first switching circuit according to the control instruction; the main control chip further includes an output terminal, and the output terminal is used to output a control signal; the control signal includes a high-level signal and a low-level signal; a key switch, connected to the control terminal of the first switching circuit, and the key switch is used to output the control instruction; when the key switch is closed, the first end and the second end of the first switching circuit are conducted; when the key switch is opened, the first end and the second end of the first switching circuit are disconnected; after the key switch is pressed, the control instruction is a high level, the first switching circuit is conducted, and the power supply (VBAT) supplies power to the main control chip; a second switching circuit, the control terminal of the second switching circuit is connected to the output terminal of the main control chip, the first end of the second switching circuit is connected to the power supply (VBAT), and the second end of the second switching circuit is connected to the input terminal (VCC); the second switching circuit controls the on / off of the first end and the second end of the second switching circuit according to the control signal.

2. The switching power supply circuit according to claim 1, characterized in that, the power supply (VBAT) is any one of commercial power, a storage battery or a dry battery.

3. The switching power supply circuit according to claim 1, characterized in that, the first switching circuit includes: a first switching tube (Q1), the control terminal of the first switching tube (Q1) is used to receive the control instruction, and the first end of the first switching tube (Q1) is grounded; a second switching tube (Q2), the control terminal of the second switching tube (Q2) is connected to the second end of the first switching tube (Q1), the first end of the second switching tube (Q2) is connected to the power supply (VBAT), and the second end of the second switching tube (Q2) is connected to the input terminal (VCC); when the first switching tube (Q1) is conducted, the second switching tube (Q2) is conducted; when the first switching tube (Q1) is cut off, the second switching tube (Q2) is cut off.

4. The switching power supply circuit according to claim 3, characterized in that, the first switching circuit further includes: a first resistor (R1), one end of the first resistor (R1) is connected to the control terminal of the first switching tube (Q1), and the other end of the first resistor (R1) is used to receive the control instruction; A second resistor (R2), one end of the second resistor (R2) is connected to the control terminal of the first switching transistor (Q1), and the other end of the second resistor (R2) is grounded; A third resistor (R3), one end of the third resistor (R3) is connected to the second terminal of the first switching transistor (Q1), and the other end of the third resistor (R3) is connected to the control terminal of the second switching transistor (Q2).

5. The switching power supply circuit according to claim 4, characterized in that, The second switching circuit includes: A third switching transistor (Q3), the control terminal of the third switching transistor (Q3) is connected to the output terminal of the main control chip, and the first terminal of the third switching transistor (Q3) is grounded; A fourth switching transistor (Q4), the control terminal of the fourth switching transistor (Q4) is connected to the second terminal of the third switching transistor (Q3), the first terminal of the fourth switching transistor (Q4) is connected to the power supply (VBAT), and the second terminal of the fourth switching transistor (Q4) is connected to the input terminal (VCC); When the third switching transistor (Q3) is turned on, the fourth switching transistor (Q4) is turned on; when the third switching transistor (Q3) is turned off, the fourth switching transistor (Q4) is turned off.

6. The switching power supply circuit according to claim 5, characterized in that, The second switching circuit further includes: A fourth resistor (R4), one end of the fourth resistor (R4) is connected to the control terminal of the third switching transistor (Q3), and the other end of the fourth resistor (R4) is used to receive the control instruction; A fifth resistor (R5), one end of the fifth resistor (R5) is connected to the control terminal of the third switching transistor (Q3), and the other end of the fifth resistor (R5) is grounded; A sixth resistor (R6), one end of the sixth resistor (R6) is connected to the second terminal of the third switching transistor (Q3), and the other end of the sixth resistor (R6) is connected to the control terminal of the fourth switching transistor (Q4).

7. A refrigerator, characterized in that, comprising: An odor removal device; The switching power supply circuit according to any one of claims 1 to 6, provided with the main control chip, and the main control chip is connected to the odor removal device through a power supply terminal.

Images