Switching power supply circuit and household appliance

Abstract

The invention discloses a switching power supply circuit and a household appliance, the switching power supply circuit comprises a rectification module, the first input end and the second input end of the rectification module are respectively connected with an AC power supply; the filtering module is controllably connected with the first output end and the second output end of the rectifying module; and the control module is respectively connected with the rectification module and the filtering module, and controls the connection relation between the rectification module and the filtering module according to the detected voltage information of the AC power supply, so as to improve the adaptive voltage range of the switching power supply circuit. Therefore, the compatibility of the switching power supply can be improved, the cost is reduced, and the miniaturization development trend of the switching power supply is promoted.

Description

Technical Field

[0001] The present invention relates to the electrical field, and in particular to a switching power supply circuit and a household appliance. Background Art

[0002] In the field of switching power supply technology, commonly used circuit topologies include BUCK, BOOST, forward and flyback, etc. These structures have their own characteristics and are widely used in various power conversion scenarios. Regardless of the circuit topology adopted, the filter module plays a vital role. It can not only effectively suppress the harmonic components in the power supply and protect the load from damage, but also significantly improve the anti-interference ability of the entire system. In view of the differences in power supply voltages in different regions of the world, usually 100-120V or 220-240V, the switching power supply design needs to be compatible with this wide input voltage range, that is, 85V to 270V. This means that the power supply system must simultaneously meet the withstand voltage requirements under high voltage input and the large capacity requirements at low voltage and high current input.

[0003] In the related art, the switching power supply generally adopts a combination of multiple electrolytic capacitors to form a filter module to achieve the above functions. However, this solution is not only costly, but also occupies a relatively large volume, which is not conducive to promoting the miniaturization trend of the switching power supply. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art to at least some extent. To this end, the first object of the present invention is to provide a switching power supply circuit, which can improve the compatibility of the switching power supply, reduce the cost, and promote the miniaturization development trend of the switching power supply.

[0005] A second objective of the present invention is to provide a household appliance.

[0006] In order to achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes a switching power supply circuit, wherein the circuit includes: a rectifier module, a first input terminal and a second input terminal of the rectifier module are respectively connected to an AC power supply; a filter module, the filter module is controllably connected to a first output terminal and a second output terminal of the rectifier module, respectively; a control module, the control module is respectively connected to the rectifier module and the filter module, and controls the connection relationship between the rectifier module and the filter module according to the voltage information of the AC power supply detected, so as to improve the adaptation voltage range of the switching power supply circuit.

[0007] According to the switching power supply circuit of the embodiment of the present invention, the connection relationship between the rectifier module and the filter module is controlled according to the voltage information of the detected AC power supply to improve the adaptive voltage range of the switching power supply circuit, thereby improving the compatibility of the switching power supply, reducing the cost, and promoting the miniaturization development trend of the switching power supply.

[0008] In addition, the switching power supply circuit according to the above embodiment of the present invention may also include the following additional technical features:

[0009] According to one embodiment of the present invention, the rectifier module includes a first diode, a second diode, a third diode and a fourth diode, wherein the anode of the first diode is connected to the cathode of the fourth diode and serves as the first input terminal, the cathode of the first diode is connected to the cathode of the second diode and serves as the second output terminal, the anode of the second diode is connected to the cathode of the third diode and serves as the second input terminal, and the anode of the third diode is connected to the anode of the fourth diode and serves as the first output terminal.

[0010] According to one embodiment of the present invention, the filtering module includes a first capacitor and a second capacitor, one end of the first capacitor is connected to the first output end of the rectifier module, the other end of the first capacitor is connected to the second output end of the rectifier module, one end of the second capacitor is connected to one end of the first capacitor, and the other end of the second capacitor is connected to the other end of the first capacitor through a controllable switch.

[0011] According to one embodiment of the present invention, the connection relationship between the rectifier module and the filter module is controlled based on the voltage information of the AC power supply detected, including: when it is determined according to the voltage information that the voltage of the AC power supply is less than a first preset voltage, the controllable switch is controlled to be closed so that the first capacitor and the second capacitor are connected in parallel; when it is determined according to the voltage information that the voltage of the AC power supply is greater than or equal to the first preset voltage, the controllable switch is controlled to be disconnected.

[0012] According to an embodiment of the present invention, the capacitance of the first capacitor is smaller than the capacitance of the second capacitor, and the withstand voltage of the first capacitor is greater than the withstand voltage of the second capacitor.

[0013] According to one embodiment of the present invention, the circuit further includes a sampling resistor and a protection resistor, one end of the sampling resistor is connected to the other end of the second capacitor, the other end of the sampling resistor is connected to the detection end of the control module, one end of the protection resistor is connected to one end of the second capacitor, and the other end of the protection resistor is connected to one end of the sampling resistor.

[0014] According to an embodiment of the present invention, the controllable switch is a MOS tube.

[0015] According to an embodiment of the present invention, the circuit further includes a circuit protection module, which is connected to the rectifier module and the control module respectively, and is used to perform overvoltage and overcurrent protection on the circuit.

[0016] According to an embodiment of the present invention, the circuit protection module includes at least one resistance device.

[0017] In order to achieve the above-mentioned object, a second embodiment of the present invention provides a household appliance, comprising the switching power supply circuit of the aforementioned embodiment of the present invention.

[0018] According to the household electrical appliances of the embodiments of the present invention, by adopting the switching power supply circuit of the above embodiments of the present invention, the compatibility of the switching power supply can be improved, the cost can be reduced, and the miniaturization development trend of the switching power supply can be promoted.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an electrical schematic diagram of a switching power supply circuit according to one embodiment of the present invention;

[0021] Figure 2 is an electrical schematic diagram of a switching power supply circuit according to another embodiment of the present invention;

[0022] Figure 3 is an electrical schematic diagram of a switching power supply circuit according to another embodiment of the present invention;

[0023] Figure 4 is an electrical schematic diagram of a switching power supply circuit according to another embodiment of the present invention;

[0024] Figure 5 is a block diagram of a household appliance according to an embodiment of the present invention.

[0025] Reference numerals:

[0026] Switching power supply circuit 100, rectifier module 10, filter module 20, control module 30, first diode D1, second diode D2, third diode D3, fourth diode D4, first capacitor C1, second capacitor C2, controllable switch 40, sampling resistor R1, protection resistor R2, first resistor R3, second resistor R4, household appliance 1000, first pin A, second pin B, third pin S, fourth pin SG, fifth pin BP, sixth pin L, seventh pin VTOP, eighth pin VBOT, ninth pin D, controllable chip U3. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0028] The switching power supply circuit and the household electrical appliance according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0029] Figure 1 is an electrical schematic diagram of a switching power supply circuit according to one embodiment of the present invention.

[0030] Specifically, in some embodiments of the present invention, Figure 1 As shown, the switching power supply circuit 100 includes a rectifying module 10 , a filtering module 20 and a control module 30 .

[0031] Among them, the first input terminal and the second input terminal of the rectifier module 10 are respectively connected to the AC power supply; the filter module 20 is controllably connected to the first output terminal and the second output terminal of the rectifier module 10; the control module 30 is respectively connected to the rectifier module 10 and the filter module 20, and controls the connection relationship between the rectifier module 10 and the filter module 20 according to the voltage information of the detected AC power supply to improve the adaptation voltage range of the switching power supply circuit.

[0032] Further, in some embodiments of the present invention, Figure 1 As shown, the rectifier module 10 includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, wherein the anode of the first diode D1 is connected to the cathode of the fourth diode D4 and serves as a first input terminal, the cathode of the first diode D1 is connected to the cathode of the second diode D2 and serves as a second output terminal, the anode of the second diode D2 is connected to the cathode of the third diode D3 and serves as a second input terminal, and the anode of the third diode D3 is connected to the anode of the fourth diode D4 and serves as a first output terminal.

[0033] Specifically, in this embodiment, the rectifier module 10 includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4. In the positive half cycle of the AC power supply, the first diode D1 and the third diode D3 are turned on, the second diode D2 and the fourth diode D4 are turned off, and the current flows in from the anode of the first diode D1, passes through the first diode D1, the load and the third diode D3 in sequence, flows out from the cathode of the third diode D3 and returns to the AC power supply; in the negative half cycle of the AC power supply, the second diode D2 and the fourth diode D4 are turned on, the first diode D1 and the third diode D3 are turned off, the current flows in from the anode of the second diode D2, passes through the second diode D2, the load and the fourth diode D4 in sequence, flows out from the cathode of the fourth diode D4 and returns to the AC power supply, thereby completing the rectification of the AC power, and the rectified DC power is output from the first output end and the second output end of the rectifier module 10.

[0034] Further, in some embodiments of the present invention, Figure 1 As shown, the filtering module 20 includes a first capacitor C1 and a second capacitor C2, one end of the first capacitor C1 is connected to the first output end of the rectifier module 10, the other end of the first capacitor C1 is connected to the second output end of the rectifier module 10, one end of the second capacitor C2 is connected to one end of the first capacitor C1, and the other end of the second capacitor C2 is connected to the other end of the first capacitor C1 through a controllable switch 40.

[0035] Specifically, in this embodiment, one end of the first capacitor C1 is connected to the anode of the third diode D3 and the anode of the fourth diode D4, and the other end of the first capacitor C1 is connected to the cathode of the first diode D1 and the cathode of the second diode D2, so that the high-frequency ripple component in the rectified direct current is filtered out by the first capacitor C1, and the output voltage is smoothed through the charging and discharging process, one end of the second capacitor C2 is connected to one end of the first capacitor C1, and the other end of the second capacitor C2 is connected to the other end of the first capacitor C1 through the controllable switch 40. When the controllable switch 40 is disconnected, the second capacitor C2 is isolated, and when the controllable switch 40 is connected, the second capacitor C2 works in parallel with the first capacitor C1.

[0036] Further, in some embodiments of the present invention, Figure 1 As shown, the connection relationship between the rectifier module 10 and the filter module 20 is controlled according to the voltage information of the detected AC power supply, including: when it is determined according to the voltage information that the voltage of the AC power supply is less than the first preset voltage, the controllable switch 40 is controlled to be closed so that the first capacitor C1 and the second capacitor C2 are connected in parallel; when it is determined according to the voltage information that the voltage of the AC power supply is greater than or equal to the first preset voltage, the controllable switch 40 is controlled to be disconnected.

[0037] Specifically, in this embodiment, the control module 30 can detect the voltage information of the AC power supply. When it is determined according to the voltage information that the voltage of the AC power supply is less than the first preset voltage, it means that the circuit has a lower voltage resistance requirement for the capacitor and a higher capacitance requirement. Figure 2 As shown, the controllable switch 40 is controlled to be closed, so that the first capacitor C1 and the second capacitor C2 are connected in parallel to form a filter module 20 with a relatively high capacitance.

[0038] When it is determined according to the voltage information that the voltage of the AC power source is greater than or equal to the first preset voltage, the capacitance requirement of the capacitor is relatively low and the withstand voltage is relatively high. Figure 3 As shown, the controllable switch 40 is controlled to be disconnected, and the filter module 20 in the circuit is composed of the first capacitor C1.

[0039] It should be noted that the value of the first preset voltage may be 150V. In addition, the present invention may not specifically limit the value of the first preset voltage.

[0040] Furthermore, in some embodiments of the present invention, the capacitance of the first capacitor C1 is smaller than the capacitance of the second capacitor C2, and the withstand voltage of the first capacitor C1 is greater than the withstand voltage of the second capacitor C2.

[0041] Specifically, in this embodiment, the capacitance of the first capacitor C1 can be 47uF, the capacitance of the second capacitor C2 can be 68uF, the withstand voltage of the first capacitor C1 can be 450V, and the withstand voltage of the second capacitor C2 can be 160V. In addition, the present invention may not specifically limit the values ​​of the capacitance of the first capacitor C1, the capacitance of the second capacitor C2, the withstand voltage of the first capacitor C1, and the withstand voltage of the second capacitor C2.

[0042] Furthermore, in some embodiments of the present invention, the circuit also includes a sampling resistor R1 and a protection resistor R2, one end of the sampling resistor R1 is connected to the other end of the second capacitor C2, the other end of the sampling resistor R1 is connected to the detection end of the control module 30, one end of the protection resistor R2 is connected to one end of the second capacitor C2, and the other end of the protection resistor R2 is connected to one end of the sampling resistor R1.

[0043] Specifically, in this embodiment, the control module 30 can obtain the voltage of the sampling resistor R1, thereby calculating the voltage input and output of the AC power supply. Through the overvoltage and overcurrent protection function of the protection resistor R2, the reliability of the switching power supply circuit 100 can be improved and the ablation of related components can be avoided.

[0044] Furthermore, in some embodiments of the present invention, the controllable switch 40 is a MOS transistor.

[0045] Specifically, in this embodiment, the controllable switch 40 is a MOS tube, and the controllable switch 40 can be controlled by an analog comparator or based on an MCU, which is not specifically limited here.

[0046] Further, in some embodiments of the present invention, Figure 4 As shown, the circuit further includes a circuit protection module, which is connected to the rectifier module 10 and the control module 30 respectively, and is used to perform overvoltage and overcurrent protection on the circuit.

[0047] Specifically, in this embodiment, the circuit protection module includes at least one resistor device, wherein, as shown in the figure, the number of the resistor devices can be two, namely a first resistor R3 and a second resistor R4, so that the circuit can be protected from overvoltage and overcurrent by the first resistor R3 and the second resistor R4.

[0048] In one embodiment of the present invention, Figure 4 As shown, the rectifier module 10 includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, the anode of the first diode D1 is connected to the cathode of the fourth diode D4 and serves as a first input terminal, the cathode of the first diode D1 is connected to the cathode of the second diode D2 and serves as a second output terminal, the anode of the second diode D2 is connected to the cathode of the third diode D3 and serves as a second input terminal, and the anode of the third diode D3 is connected to the anode of the fourth diode D4 and serves as a first output terminal.

[0049] The filtering module 20 includes a first capacitor C1 and a second capacitor C2, one end of the first capacitor C1 is connected to the anode of the third diode D3 and the anode of the fourth diode D4, the other end of the first capacitor C1 is connected to the cathode of the first diode D1 and the cathode of the second diode D2, and one end of the second capacitor C2 is connected to one end of the first capacitor C1.

[0050] One end of the sampling resistor R1 is connected to the other end of the second capacitor C2, one end of the protection resistor R2 is connected to one end of the second capacitor C2, the other end of the protection resistor R2 is connected to one end of the sampling resistor R1, one end of the first resistor R3 is connected to one end of the protection resistor R2, and the other end of the first resistor R3 is connected to one end of the second resistor R4.

[0051] The control module 30 includes a controllable chip U3, which includes a first pin A, a second pin B, a third pin S, a fourth pin SG, a fifth pin BP, a sixth pin L, a seventh pin VTOP, an eighth pin VBOT and a ninth pin D, wherein the first pin A, the second pin B, the third pin S, the fourth pin SG and the fifth pin BP are grounded, the sixth pin L is used as a power supply output, the seventh pin VTOP is connected to the other end of the second resistor R4, the eighth pin VBOT is connected to the other end of the sampling resistor R1, and the ninth pin D is connected to the other end of the second capacitor C2. A MOS tube is provided between the third pin S and the ninth pin D.

[0052] It should be noted that the resistance value of the sampling resistor R1 is 1MR, the resistance value of the protection resistor R2 is 3.9MR, the resistance value of the first resistor R3 is 2MR, the resistance value of the second resistor R4 is 1.8MR, the capacitance value of the first capacitor C1 is 47uF, and the withstand voltage is 450V, the capacitance value of the second capacitor C2 is 68uF, and the withstand voltage is 160V. In addition, the present invention may not specifically limit the values ​​of the sampling resistor R1, the protection resistor R2, the first resistor R3, the second resistor R4, the first capacitor C1 and the second capacitor C2.

[0053] In summary, according to the switching power supply circuit of the embodiment of the present invention, the connection relationship between the rectifier module and the filter module is controlled according to the voltage information of the detected AC power supply to improve the adaptation voltage range of the switching power supply circuit, thereby improving the compatibility of the switching power supply, reducing the cost, and promoting the miniaturization development trend of the switching power supply.

[0054] Figure 5 is a block diagram of a household appliance according to an embodiment of the present invention.

[0055] like Figure 5 As shown, the household appliance 1000 includes the switching power supply circuit 100 according to the above-mentioned embodiment of the present invention.

[0056] According to the household electrical appliances of the embodiments of the present invention, by adopting the switching power supply circuit of the above embodiments of the present invention, the compatibility of the switching power supply can be improved, the cost can be reduced, and the miniaturization development trend of the switching power supply can be promoted.

[0057] In addition, other structures and functions of the household appliance of the embodiment of the present invention are known to those skilled in the art and will not be described in detail here to reduce redundancy.

[0058] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0060] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0061] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0062] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0064] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A switching power supply circuit, characterized in that: The circuit comprises: A rectifier module, wherein a first input terminal and a second input terminal of the rectifier module are respectively connected to an AC power source; A filter module, wherein the filter module is controllably connected to the first output terminal and the second output terminal of the rectifier module respectively; A control module, wherein the control module is connected to the rectifier module and the filter module respectively, and controls the connection relationship between the rectifier module and the filter module according to the voltage information of the AC power supply detected, so as to improve the adaptation voltage range of the switching power supply circuit.

2. The switching power supply circuit according to claim 1, characterized in that: The rectifier module includes a first diode, a second diode, a third diode and a fourth diode, wherein the anode of the first diode is connected to the cathode of the fourth diode and serves as the first input end, the cathode of the first diode is connected to the cathode of the second diode and serves as the second output end, the anode of the second diode is connected to the cathode of the third diode and serves as the second input end, and the anode of the third diode is connected to the anode of the fourth diode and serves as the first output end.

3. The switching power supply circuit according to claim 2, characterized in that: The filtering module includes a first capacitor and a second capacitor, one end of the first capacitor is connected to the first output end of the rectifier module, the other end of the first capacitor is connected to the second output end of the rectifier module, one end of the second capacitor is connected to one end of the first capacitor, and the other end of the second capacitor is connected to the other end of the first capacitor through a controllable switch.

4. The switching power supply circuit according to claim 3, characterized in that: Controlling the connection relationship between the rectifier module and the filter module according to the detected voltage information of the AC power supply includes: When it is determined according to the voltage information that the voltage of the AC power supply is less than a first preset voltage, the controllable switch is controlled to be closed so that the first capacitor and the second capacitor are connected in parallel; when it is determined according to the voltage information that the voltage of the AC power supply is greater than or equal to the first preset voltage, the controllable switch is controlled to be disconnected.

5. The switching power supply circuit according to claim 4, characterized in that: The capacitance of the first capacitor is smaller than the capacitance of the second capacitor, and the withstand voltage of the first capacitor is greater than the withstand voltage of the second capacitor.

6. The switching power supply circuit according to claim 3, characterized in that: The circuit also includes a sampling resistor and a protection resistor, one end of the sampling resistor is connected to the other end of the second capacitor, the other end of the sampling resistor is connected to the detection end of the control module, one end of the protection resistor is connected to one end of the second capacitor, and the other end of the protection resistor is connected to one end of the sampling resistor.

7. The switching power supply circuit according to any one of claims 3 to 6, characterized in that: The controllable switch is a MOS tube.

8. The switching power supply circuit according to any one of claims 1 to 6, characterized in that: The circuit also includes a circuit protection module, which is connected to the rectifier module and the control module respectively, and is used to perform overvoltage and overcurrent protection on the circuit.

9. The switching power supply circuit according to claim 8, characterized in that: The circuit protection module includes at least one resistor device.

10. A household appliance, characterized in that: A switching power supply circuit comprising any one of claims 1 to 9.

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