Power supply circuit and power supply adapter

Abstract

The utility model relates to a power supply circuit and a power adapter. The power supply circuit comprises a first energy storage module which is connected with the input end and the output end of the power supply circuit; the second energy storage module is connected with the input end and the output end and is connected with the first energy storage module in parallel; the first switch module is connected to a first energy storage loop between the input end and the first energy storage module and connected to a second energy storage loop between the input end and the second energy storage module; when the first energy storage loop and the second energy storage loop are both conducted, the input end transmits energy to the first energy storage module and the second energy storage module. According to the embodiment of the invention, the size of the overall power circuit can be reduced, and the overall efficiency of the power adapter where the power circuit is located is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of power supply, and in particular, to a power supply circuit and a power adapter. BACKGROUND

[0002] With the development of technology, the power output (PD) adapter of consumer electronics products has become an important indicator in terms of high power, miniaturization, and high efficiency.

[0003] At present, in the existing PD adapter, the switching tube in the adapter is prone to hard switching loss due to the overlap of voltage and current in the switching process. However, the existence of hard switching loss limits the improvement of switching frequency, resulting in low overall efficiency of the adapter, and the overall size of the adapter cannot be reduced. UTILITY MODEL CONTENT

[0004] To overcome the problems in the related art, the present disclosure provides a power supply circuit and a power adapter, which can reduce the overall size of the power supply circuit and improve the overall efficiency of the power adapter in which the power supply circuit is located.

[0005] According to a first aspect of an embodiment of the present disclosure, a power supply circuit is provided, which at least includes:

[0006] a first energy storage module connected between the input end and the output end of the power supply circuit;

[0007] a second energy storage module connected between the input end and the output end and arranged in parallel with the first energy storage module;

[0008] a first switching module connected on a first energy storage loop between the input end and the first energy storage module, and connected on a second energy storage loop between the input end and the second energy storage module;

[0009] When the first energy storage loop and the second energy storage loop are both conductive, the input end transmits energy to the first energy storage module and the second energy storage module.

[0010] In some embodiments, the power supply circuit further includes:

[0011] a resonance component connected at one end to a connection line between the second energy storage module and the output end, and connected at the other end to a connection line between the input end and the output end;

[0012] a second switching module connected at one end to the resonance component and connected at the other end to a connection line between the input end and the output end;

[0013] The resonant assembly and the second energy storage module resonate when the second switch module is in the on state and the first switch module is in the off state.

[0014] In some embodiments, the first switch module comprises:

[0015] a first switch tube, one end of which is connected to a connecting line between the first energy storage module and the second energy storage module, and the other end of which is connected to a connecting line between the input end and the second switch module;

[0016] a first unidirectional conducting tube and a parasitic capacitor, both of which are connected in parallel across the first switch tube;

[0017] When the second switch module is in the on state and the first switch tube is in the off state, a resonant current generated by the resonant assembly and the second energy storage module discharges the parasitic capacitor; when the voltage of the parasitic capacitor drops to zero, the first unidirectional conducting tube is in a reverse bias state.

[0018] In some embodiments, the second energy storage module comprises:

[0019] an energy storage capacitor, which is connected between the first energy storage module and the output end, and connects the resonant assembly, for storing energy on the second energy storage module when the first switch module is in the on state, and resonating with the resonant assembly when the second switch module is in the on state and the first switch module is in the off state;

[0020] a second unidirectional conducting tube, which connects the input end and the energy storage capacitor, for inhibiting the backflow of transmitted energy when the energy storage capacitor transmits energy to the output end.

[0021] In some embodiments, the power supply circuit further comprises:

[0022] a third unidirectional conducting tube, which is connected between the energy storage capacitor and the output end;

[0023] a plurality of first output capacitors, which are arranged in parallel between the third unidirectional conducting tube and the input end;

[0024] When the first switch module is in the on state, the third unidirectional conducting tube is in a reverse bias state, and the first output capacitors transmit energy to the output end;

[0025] When the first switch module and the second switch module are both in the off state, the third unidirectional conducting tube is in a forward bias state, and the input end transmits energy to the first output capacitors through the first energy storage module, the energy storage capacitor and the third unidirectional conducting tube.

[0026] In some embodiments, the power supply circuit further comprises:

[0027] a voltage conversion module connected between the first output capacitor and the output terminal;

[0028] a second output capacitor connected in parallel across the voltage conversion module and arranged in parallel with the output terminal.

[0029] In some embodiments, the power supply circuit further comprises:

[0030] a first filter circuit connected between the input terminal and the first energy storage module, for filtering electromagnetic interference of the alternating current signal input by the input terminal;

[0031] a second filter circuit connected between the first filter circuit and the first energy storage module, for converting the alternating current signal filtered of electromagnetic interference into a direct current signal.

[0032] In some embodiments, the first filter circuit comprises:

[0033] a first filter capacitor arranged in parallel with the input terminal;

[0034] a common mode inductor, a first input terminal of the common mode inductor connected to one end of the first filter capacitor, a second input terminal of the common mode inductor connected to the other end of the first filter capacitor, a first output terminal of the common mode inductor and a second output terminal of the common mode inductor both connected to the second filter circuit.

[0035] In some embodiments, the second filter circuit comprises:

[0036] a rectifier bridge connected between the first output terminal of the common mode inductor and the second output terminal of the common mode inductor, and connected between the first energy storage module and the first switch module;

[0037] a filter inductor connected between the rectifier bridge and the first energy storage module;

[0038] a second filter capacitor, one end connected to a connection line between the rectifier bridge and the filter inductor, and the other end connected to a connection line between the rectifier bridge and the first switch module;

[0039] a third filter capacitor, one end connected to a connection line between the filter inductor and the first energy storage module, and the other end connected to a connection line between the rectifier bridge and the first switch module.

[0040] According to a second aspect of the embodiments of the present disclosure, a power adapter is provided, which at least comprises:

[0041] The power supply circuit according to the first aspect;

[0042] The control module is connected to the first switch module of the power supply circuit, and is configured to control the switching state of the first switch module.

[0043] The technical solution provided by the embodiments of the present disclosure can have the following beneficial effects:

[0044] The power supply circuit and the power adapter provided by the embodiments of the present disclosure have the following beneficial effects:

[0045] In this way, the embodiments of the present disclosure can set the first switch module on the first energy storage loop between the input end and the first energy storage module, and on the second energy storage loop between the input end and the second energy storage module, so that when the first energy storage loop and the second energy storage loop are both turned on, the second energy storage module can be used to share the energy stored in the first energy storage module. On the one hand, the current flowing through the first energy storage module can be reduced to reduce the energy storage parameters of the first energy storage module, so that the volume of the first energy storage module and the overall volume of the power supply circuit can be reduced. On the other hand, the current ripple in the power supply circuit can be reduced, thereby reducing the energy loss in the power supply circuit and improving the overall efficiency of the power adapter in which the power supply circuit is located.

[0046] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0047] The accompanying drawings, which are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure.

[0048] Figure 1 is a structural schematic diagram of a power supply circuit according to an exemplary embodiment Figure 1 .

[0049] Figure 2 is a structural schematic diagram of a power supply circuit according to an exemplary embodiment Figure 2 .

[0050] Figure 3 is a driving waveform timing diagram of the first switch module and the second switch module in a power supply circuit according to an exemplary embodiment.

[0051] Figure 4 is a schematic diagram of a power supply circuit when a first switch module is in an on state according to an exemplary embodiment.

[0052] Figure 5 is a schematic diagram of a power supply circuit when both the first switch module and the second switch module are in an off state according to an exemplary embodiment.

[0053] Figure 6 is a schematic diagram of a power supply circuit when the second switch module is in an on state and the first switch module is in an off state according to an exemplary embodiment.

[0054] Figure 7 is a waveform diagram of an output voltage in a power supply circuit according to an exemplary embodiment.

[0055] Figure 8 is a waveform diagram of a voltage of a first switch tube and a driving voltage in a power supply circuit according to an exemplary embodiment.

[0056] Figures 1 to 8 Reference numerals of the drawings:

[0057] 10 - power supply circuit, 11 - first energy storage module, 101 - input terminal, 102 - output terminal, 12 - second energy storage module, 13 - first switch module, 14 - second switch module, 15 - voltage conversion module, 16 - first filter circuit, 17 - second filter circuit. DETAILED DESCRIPTION

[0058] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, the same numbers are used to indicate the same elements throughout the drawings, unless otherwise explicitly stated. The following exemplary embodiments described in the detailed description are not meant to be limiting of all embodiments that can come within the scope of the present disclosure. Rather, they are example only, and are not exhaustive of all possible embodiments, as the scope of the claims is what determines what embodiments are within the scope of the present disclosure.

[0059] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0060] In the description of the present disclosure, it should be noted that the terms "mounting", "connection", "connecting" should be understood in a broad sense and should not be limited to the direct connection unless otherwise specified and limited. For example, it can be fixed connection, detachable connection, or integral connection; it can be mechanical connection, electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0061] The technical solutions provided by the various embodiments of the present disclosure are described in detail below in combination with the drawings.

[0062] In the related art, in the existing PD adapter, the switch tube in the adapter is prone to hard switching loss due to the overlap of voltage and current in the switching process. However, the existence of hard switching loss will limit the improvement of switching frequency, resulting in low overall efficiency of the adapter, and the overall size of the adapter cannot be reduced.

[0063] Based on this, the present embodiment provides a power supply circuit. Figure 1 is a structural schematic diagram of a power supply circuit according to an exemplary embodiment Figure 1 As shown in Figure 1 The power supply circuit 10 at least includes:

[0064] The first energy storage module 11 is connected to the input end 101 and the output end 102 of the power supply circuit 10.

[0065] The second energy storage module 12 is connected to the input end 101 and the output end 102, and is arranged in parallel with the first energy storage module 11.

[0066] The first switch module 13 is connected to the first energy storage circuit between the input end 101 and the first energy storage module 11, and is connected to the second energy storage circuit between the input end 101 and the second energy storage module 12.

[0067] Wherein, when the first energy storage circuit and the second energy storage circuit are both turned on, the input end 101 transmits energy to the first energy storage module 11 and the second energy storage module 12.

[0068] In the present embodiment, the above-mentioned power supply circuit can be a circuit for charging external devices in a power supply adapter; for example, the power supply circuit can be a circuit for charging mobile phones, notebook computers or tablet computers, etc. in a power supply adapter, or it can also be a circuit for charging household appliances or electric bicycles, etc. in a power supply adapter.

[0069] The input end of the power supply circuit can be a port for receiving external power supply (e.g., 220V mains) input AC signal or the like. The output end of the power supply circuit can be a port for charging external devices by the power adapter in which the power supply circuit is located. For example, as shown in FIG. 10, when the power supply circuit 10 is a circuit in a mobile phone charger, the input end 101 can be responsible for receiving AC signals from a socket, and the output end 102, i.e., the V Figure 2 out The DC signal converted by the power supply circuit 10 can be output to a mobile phone for charging.

[0070] The first energy storage module and the second energy storage module can each be an electronic component for converting the current in the power supply circuit into magnetic field energy for energy storage. For example, the first energy storage module and the second energy storage module can each include, but are not limited to, an energy storage inductor or an energy storage capacitor.

[0071] It should be noted that the specific number of components included in the first energy storage module can be set according to the actual application scenario, and the embodiments of the present disclosure do not limit the number of components. For example, the first energy storage module can include one, two, or three energy storage inductors, etc.

[0072] For example, the first energy storage module can include a power factor correction (PFC) inductor. The PFC inductor can store and release energy while the switching state of the first switching module in the power supply circuit is switched, thereby improving the power factor of the power supply circuit, reducing reactive power, i.e., reducing energy loss, and thereby improving energy utilization efficiency.

[0073] It can be understood that the second energy storage module can include, but is not limited to, an energy storage capacitor and a diode, such as a flying capacitor and a bypass diode. The flying capacitor is a circuit component for voltage reduction, voltage increase, or power waveform improvement, and can be composed of at least three capacitors. Two of the at least three capacitors can be considered as active capacitors, and the third capacitor can be used as a load capacitor.

[0074] It should be noted that the specific number of components included in the second energy storage module can also be set according to the actual application scenario, and the embodiments of the present disclosure do not limit the number of components.

[0075] In the embodiments of the present disclosure, the first switching module can be an electronic component for opening the power supply circuit, interrupting the current, or causing the current to flow to other circuits. For example, the first switching module can include, but is not limited to, a field effect transistor, a switching chip, or a relay, etc.

[0076] ​Here, the first switch module can serve as a main switch of the power supply circuit, one end of the first switch module can be connected to a connection line between the first energy storage module and the second energy storage module, and the other end of the first switch module can be connected to a connection line between the input end and the output end.

[0077] It should be noted that the number of switches in the first switch module can be set according to actual application scenarios, and the embodiments of the present disclosure do not limit.

[0078] It can be understood that when the first switch module is in a conducting state, the first energy storage loop between the input end, the first energy storage module and the first switch module can be conducted, and the second energy storage loop between the input end, the second energy storage module and the first switch module can also be conducted; that is, when the first energy storage loop and the second energy storage loop are both conducted, the above input end can transmit energy to the first energy storage module through the first energy storage loop, and can also transmit energy to the second energy storage module through the second energy storage loop, so as to be able to share the current flowing through the first energy storage module by using the second energy storage module.

[0079] In some embodiments, the first switch module can include a field effect tube; wherein the field effect tube can be a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), abbreviated as MOS tube, and the field effect tube can include a gate, a source and a drain.

[0080] Here, the gate of the field effect tube can be connected to the control module of the power adapter where the power supply circuit is located, and the gate of the field effect tube is controlled to input a high-level signal or a low-level signal through the control module, so as to control the first switch module to be in a conducting or disconnected state. Wherein, the field effect tube can be various types of MOS tubes, for example, the field effect tube can be divided into PMOS tube (P-channel type) and NMOS tube (N-channel type).

[0081] When the field effect tube is a PMOS tube, a high-level signal can be input to the gate of the PMOS tube to control the PMOS tube to be in a cut-off state; or a low-level signal can also be input to the gate of the PMOS tube to control the PMOS tube to be in a conducting state. When the field effect tube is an NMOS tube, a low-level signal can be input to the gate of the NMOS tube through the control module to control the NMOS tube to be in a cut-off state; or a high-level signal can also be input to the gate of the NMOS tube through the control module to control the NMOS tube to be in a conducting state.

[0082] For example, as shown in Figure 2 the first switch module 13 can include an NMOS tube, that is, Figure 2Q1 is an NMOS transistor. The source of Q1 in the first switch module 13 is connected to the connecting line between the input end 101 and the output end 102, and the drain of Q1 is connected to the connecting line between the first energy storage module 11 and the second energy storage module 12.

[0083] The power supply circuit provided by the embodiments of the present disclosure comprises: a first energy storage module connected to an input end and an output end of the power supply circuit; a second energy storage module connected to the input end and the output end and arranged in parallel with the first energy storage module; and a first switch module connected to a first energy storage loop between the input end and the first energy storage module and connected to a second energy storage loop between the input end and the second energy storage module; wherein when the first energy storage loop and the second energy storage loop are both turned on, the input end transmits energy to the first energy storage module and the second energy storage module.

[0084] In this way, the embodiments of the present disclosure can set the first switch module on the first energy storage loop between the input end and the first energy storage module and on the second energy storage loop between the input end and the second energy storage module, so that when the first energy storage loop and the second energy storage loop are both turned on, the second energy storage module can be used to share the energy stored in the first energy storage module. On the one hand, the current flowing through the first energy storage module can be reduced to reduce the energy storage parameters of the first energy storage module, so that the volume of the first energy storage module and the overall volume of the power supply circuit can be reduced. On the other hand, the current ripple in the power supply circuit can be reduced, thereby reducing the energy loss in the power supply circuit and improving the overall efficiency of the power supply adapter in which the power supply circuit is located.

[0085] In some embodiments, as shown in Figure 2 The power supply circuit 10 further comprises:

[0086] a resonant component Lr connected at one end to the connecting line between the second energy storage module 12 and the output end 102 and at the other end to the connecting line between the input end 101 and the output end 102;

[0087] a second switch module 14 connected at one end to the resonant component Lr and at the other end to the connecting line between the input end 101 and the output end 102;

[0088] When the second switch module 14 is in the on state and the first switch module 13 is in the off state, the resonant component Lr and the second energy storage module 12 resonate.

[0089] In this way, the first switch module can be turned on or turned off under zero-voltage or zero-current conditions, so as to help the first switch module to achieve soft switching technology, thereby being able to more effectively reduce electromagnetic interference and loss in the power supply circuit and improve the charging efficiency of the power adapter in which the power supply circuit is located.

[0090] In the embodiments of the present disclosure, the resonant assembly can be a device capable of resonating with the second energy storage module in the power supply circuit; for example, the resonant assembly can include but is not limited to a resonant inductor or a resonant capacitor, etc.

[0091] Here, the second switch module can be an electronic element that opens the power supply circuit, interrupts the current, or causes the current to flow to other circuits; for example, the second switch module can include but is not limited to a field effect transistor, a switch chip, or a relay, etc.

[0092] It should be noted that the second switch module can serve as an auxiliary switch of the power supply circuit, and the switch structures provided in the first switch module and the second switch module can be the same or different. In addition, the number of switches in the second switch module can also be set according to the actual application scenario, and the embodiments of the present disclosure do not make any limitation.

[0093] For example, as shown in FIG. 1, the second switch module 14 can include a PMOS tube, i.e., Q2 in FIG. 1 is a PMOS tube. Figure 2 As shown in FIG. 1, the second switch module 14 can also include a NMOS tube, i.e., Q2 in FIG. 1 is a NMOS tube. Figure 2 Among them, the source of Q2 in the second switch module 14 is connected to the connection line between the input end 101 and the output end 102, and the drain of Q2 is connected to the resonant assembly Lr.

[0094] It can be understood that when the first switch module and the second switch module are both in the off state, the energy stored in the first energy storage module and the second energy storage module can be released to the output end to achieve energy supply to the subsequent stage of the output end. Before the first switch module is turned on, the second switch module can be controlled to be turned on at a preset duty ratio, i.e., when the second switch module is in the on state and the first switch module is in the off state, the resonant assembly and the second energy storage module can resonate, and through the resonant current generated by the resonant assembly and the second energy storage module, the first switch module can be in the on state when the voltage across the first switch module is 0, so as to make the first switch module achieve soft switching technology.

[0095] Here, the soft switching technology is to introduce resonance before and after the switching process, so that the voltage is first reduced to zero (zero voltage conduction) or the current is first reduced to zero (zero current off) before the switch is turned on, thereby eliminating the overlap of voltage and current in the switching process, reducing the rate of change of voltage or current, and thus reducing or eliminating switching loss, while reducing switching noise.

[0096] It should be noted that the preset duty ratio can be the ratio of the on time of the second switch module in the preset period. For example Figure 3 As shown in the figure, in the preset period, the on time S1 of the first switch module is greater than the on time S2 of the second switch module; and the on time S2 of the second switch module in the last period is continuous with the on time S1 of the first switch module in the current period.

[0097] In some embodiments, as shown in the figure Figure 2 The first switch module 13 includes

[0098] The first switch tube Q1 is connected at one end to the connection line between the first energy storage module 11 and the second energy storage module 12, and at the other end to the connection line between the input end 101 and the second switch module 14;

[0099] The first unidirectional conduction tube D1 and the parasitic capacitor C1 are both connected in parallel across the first switch tube Q1;

[0100] When the second switch module 14 is in the on state and the first switch tube Q1 is in the off state, the resonance current generated by the resonance assembly Lr and the second energy storage module 12 discharges the parasitic capacitor C1; when the voltage of the parasitic capacitor C1 drops to zero, the first unidirectional conduction tube D1 is in a reverse bias state.

[0101] In this way, the resonance current generated by the resonance between the second switch module and the second energy storage module can discharge the parasitic capacitor in the first switch module when the second switch module is in the on state and the first switch tube in the first switch module is in the off state, so that when the voltage of the parasitic capacitor drops to zero, the first unidirectional conduction tube in the first switch module is turned on and the second switch module is switched from the on state to the off state, and the first switch module is switched from the off state to the on state, so that the first switch module realizes soft switching technology, thereby effectively reducing electromagnetic interference and loss in the power supply circuit, and effectively improving the charging efficiency of the power adapter in which the power supply circuit is located.

[0102] In the embodiments of the present disclosure, the first switch tube in the first switch module can include a field effect tube, such as a PMOS tube or an NMOS tube. The first unidirectional conduction tube can be a diode or a triode; the parasitic capacitor can be a parasitic capacitor formed between the gate, source and drain of the MOS tube.

[0103] For example, the first unidirectional conducting diode is connected in parallel across the source and drain of the first switching transistor and can serve as the body diode of the field-effect transistor; when the source and drain of the first switching transistor are conducting, the first unidirectional conducting diode is cut off, so that the first unidirectional conducting diode is in a reverse bias state.

[0104] Here, the voltage between the source and drain of the first switching transistor can be the same as the voltage across the first unidirectional conducting transistor, or it can be the same as the voltage across the parasitic capacitor.

[0105] Understandably, before controlling the first switching transistor to turn on, the second switching module can be controlled to turn on with a preset duty cycle. That is, when the second switching module is in the on state and the first switching transistor is in the off state, the parasitic capacitance of the first switching transistor is discharged through the resonant current generated by the resonant component and the second energy storage module. When the voltage of the parasitic capacitance drops to 0, the first unidirectional conducting transistor is in the reverse bias state. At this time, the source and drain of the first switching transistor can be controlled to conduct, so that the first switching transistor can realize soft switching technology.

[0106] In some embodiments, such as Figure 2 As shown, the second energy storage module 12 includes:

[0107] Energy storage capacitor C f It is connected between the first energy storage module 11 and the output terminal 102, and connected to the resonant component Lr. It is used to store the energy on the second energy storage module 12 when the first switch module 13 is in the on state, and to resonate with the resonant component Lr when the second switch module 14 is in the on state and the first switch module 13 is in the off state.

[0108] The second unidirectional transistor D2 is connected to the input terminal 101 and the energy storage capacitor C. f Between, used in energy storage capacitor C f When releasing energy to the output terminal 102, the backflow of the released energy is suppressed.

[0109] Thus, when the first switching module is in the ON state, energy can be transferred from the input terminal to the energy storage capacitor through the second unidirectional transistor, which can share the energy stored in the first energy storage module and better reduce the current ripple in the power supply circuit. Furthermore, when the energy storage capacitor releases energy to the output terminal, the second unidirectional transistor can suppress the backflow of the released energy, thereby effectively reducing energy loss in the power supply circuit and improving the overall efficiency of the power adapter in which the power supply circuit is located. At the same time, when the second switching module is in the ON state and the first switching module is in the OFF state, the energy storage capacitor can resonate with the resonant component, enabling the first switching module to turn on or off under zero voltage or zero current conditions, which helps the first switching module to achieve soft switching technology.

[0110] In the embodiments of the present disclosure, the energy storage capacitor can be a device for storing and releasing energy when the switching state of the first switch module or the second switch module in the power supply circuit is switched, and can be used to balance the voltage fluctuation in the power supply circuit to reduce the current ripple in the power supply circuit. At this time, the resonant component can be a resonant inductor.

[0111] Here, the second unidirectional conducting tube can be a diode or a triode; one end of the second unidirectional conducting tube can be connected to the connecting line between the input end and the first energy storage module, and the other end of the second unidirectional conducting tube can be connected to the connecting line between the energy storage capacitor and the output end.

[0112] It can be understood that when the first switch module is in a conducting state, the second energy storage circuit in which the second energy storage module is located can be conducted; at this time, the second unidirectional conducting tube can be in a forward bias state, i.e., a conducting state, and the input end transmits energy to the energy storage capacitor through the second unidirectional conducting tube. When the first switch module and the second switch module are both in a disconnected state, the energy stored in the energy storage capacitor in the second energy storage module can be released to the output end; at this time, the second unidirectional conducting tube can be in a reverse bias state, i.e., a cut-off state, and can inhibit the backflow of the energy released to the output end. When the second switch module is in a conducting state and the first switch module is in a disconnected state, the energy storage capacitor can resonate with the resonant component to enable the first switch module to implement soft switching technology.

[0113] It should be noted that the specific number of energy storage capacitors included in the second energy storage module can also be set according to actual application scenarios, and the embodiments of the present disclosure do not limit the number of energy storage capacitors. For example, the second energy storage module can include one or more energy storage capacitors; when there are multiple energy storage capacitors, the multiple energy storage capacitors can be connected in parallel between the first energy storage module and the output end.

[0114] In some embodiments, as shown in Figure 2 The power supply circuit 10 further includes:

[0115] a third unidirectional conducting tube D3 connected between the energy storage capacitor C f and the output end 102;

[0116] a plurality of first output capacitors EC connected in parallel between the third unidirectional conducting tube D3 and the input end 101;

[0117] When the first switch module 13 is in a conducting state, the third unidirectional conducting tube D3 is in a reverse bias state, and the first output capacitor EC releases energy to the output end 102;

[0118] When the first switch module 13 and the second switch module 14 are both in a disconnected state, the third unidirectional conducting tube D3 is in a forward bias state, and the input end 101 transmits energy to the output end 102 through the first energy storage module 11, the energy storage capacitor C fand the third unidirectional conducting tube D3 transmits energy to the first output capacitor EC.

[0119] In this way, the first output capacitor can release energy to the output terminal when the third unidirectional conducting tube is in the reverse bias state while the first switch module is in the conducting state, so as to provide energy for devices in the subsequent stage of the first output capacitor; and the input terminal can transmit energy to the first output capacitor through the first energy storage module, the energy storage capacitor and the third unidirectional conducting tube when the third unidirectional conducting tube is in the forward bias state while the first switch module and the second switch module are both in the open state, so as to directly supply energy to the devices in the subsequent stage of the first output capacitor, thereby effectively reducing energy loss in the power supply circuit and better improving the overall efficiency of the power adapter.

[0120] In the embodiments of the present disclosure, the third unidirectional conducting tube can be a diode or a triode; one end of the third unidirectional conducting tube can be connected to the connecting line between the energy storage capacitor and the first unidirectional conducting tube, and the other end of the third unidirectional conducting tube can be connected to the output terminal.

[0121] Here, the third unidirectional conducting tube in the forward bias state can be understood as the current in the third unidirectional conducting tube flowing from the positive electrode to the negative electrode, i.e., the third unidirectional conducting tube is in the conducting state; and the third unidirectional conducting tube in the reverse bias state can be understood as the current in the third unidirectional conducting tube flowing from the negative electrode to the positive electrode, i.e., the third unidirectional conducting tube is in the cut-off state.

[0122] It can be understood that one end of each first output capacitor can be connected to the connecting line between the third unidirectional conducting tube and the output terminal, and the other end of each first output capacitor can be connected to the connecting line between the input terminal and the output terminal. The first output capacitor can store energy from the input terminal and / or the first energy storage module, the energy storage capacitor when the first switch module and the second switch module are both in the open state, or when the second switch module is in the conducting state and the first switch module is in the open state; and release energy to devices in the subsequent stage of the first output capacitor, such as the voltage conversion module, when the first switch module is in the conducting state.

[0123] It should be noted that the specific number of first output capacitors can be set according to actual application scenarios, and the embodiments of the present disclosure do not limit the number of first output capacitors. For example, the first output capacitor can be 2, 3 or 4, etc.

[0124] In some embodiments, as shown in Figure 2 The power supply circuit 10 further includes:

[0125] a voltage conversion module 15 connected between the first output capacitor EC and the output terminal 102;

[0126] a second output capacitor C outThe voltage conversion module 15 is connected in parallel at both ends of the voltage conversion module 15 and is arranged in parallel with the output end 102.

[0127] In this way, by arranging the voltage conversion module and the second output capacitor between the first output capacitor and the output end, the voltage of the electrical signal output by the first output capacitor can be further boosted or reduced, so that the external device can be better charged through the output end, thereby effectively improving the overall efficiency of the power adapter in which the power supply circuit is located.

[0128] In the embodiments of the present disclosure, the voltage conversion module can be a device for converting a direct current signal into a direct current signal of a different voltage. For example, the voltage conversion module can be a direct current-to-direct current converter (DC / DC), which can convert a direct current signal of a first voltage into a direct current signal of a second voltage, the first voltage and the second voltage being different voltages.

[0129] Here, the second output capacitor can be a capacitor element connected in parallel at the output end in the power supply circuit, and the second output capacitor can store electrical energy to stabilize the output voltage of the power supply circuit.

[0130] It can be understood that the input voltage of the voltage conversion module can be different from the output voltage of the voltage conversion module. That is, the input voltage of the voltage conversion module can be greater than the output voltage of the voltage conversion module, or the input voltage of the voltage conversion module can be less than the output voltage of the voltage conversion module.

[0131] It should be noted that the specific type of the voltage conversion module can be set according to the actual application scenario, and the embodiments of the present disclosure do not limit the voltage conversion module. For example, the voltage conversion module can be a charge pump, a boost circuit or a buck circuit, etc.

[0132] In some embodiments, as shown in Figure 2 The power supply circuit 10 further includes:

[0133] The first filter circuit 16 is connected between the input end 101 and the first energy storage module 11, and is used to filter electromagnetic interference of the alternating current signal input by the input end 101.

[0134] The second filter circuit 17 is connected between the first filter circuit 16 and the first energy storage module 11, and is used to convert the alternating current signal filtered of electromagnetic interference into a direct current signal.

[0135] In this way, the first energy storage module can be filtered by sequentially arranging the first filter circuit and the second filter circuit between the input end and the first energy storage module, so that the first energy storage module is input with stable direct current voltage, thereby effectively improving the charging efficiency of the power adapter in which the power supply circuit is located.

[0136] In the embodiments of the present disclosure, the first filter circuit can be an electromagnetic interference (EMI) filtering circuit in the power supply circuit; for example, the first filter circuit can include but is not limited to a first filter capacitor and a common mode inductor. The second filter circuit can be a rectifier filter circuit in the power supply circuit; for example, the second filter circuit can include but is not limited to a rectifier bridge, a second filter capacitor, a filter inductor and a third filter capacitor.

[0137] It can be understood that the first filter circuit can filter the electromagnetic interference of the alternating current signal input by the input end, and then convert the alternating current signal after filtering the electromagnetic interference into a stable direct current signal through the second filter circuit.

[0138] It should be noted that the number of components included in the first filter circuit and the second filter circuit can be set according to the actual application scenario, and the embodiments of the present disclosure do not limit.

[0139] In some embodiments, as shown in Figure 2 The first filter circuit 16 includes:

[0140] a first filter capacitor C x , which is connected in parallel with the input end 101;

[0141] a common mode inductor LF1, a first input end of the common mode inductor LF1 is connected to one end of the first filter capacitor C x , a second input end of the common mode inductor LF1 is connected to the other end of the first filter capacitor C x , and a first output end of the common mode inductor LF1 and a second output end of the common mode inductor LF1 are both connected to the second filter circuit 17.

[0142] In this way, a first filter capacitor can be connected in parallel at the input end, and a common mode inductor connected to the first filter capacitor is arranged, so that the alternating current signal input by the input end can be better filtered for electromagnetic interference, thereby effectively improving the charging efficiency of the power adapter in which the power supply circuit is located.

[0143] In the embodiments of the present disclosure, the first filter capacitor can be a device that constitutes an EMI filter circuit together with the common mode inductor in the power supply circuit.

[0144] Here, the common mode inductance can be a common mode interference suppression device with a magnetic core of ferrite or the like, which is formed by two coils of the same size and number of turns symmetrically wound on the same ferrite ring-shaped magnetic core, the winding direction of the coils being opposite.

[0145] The common mode inductance can include a first coil and a second coil, the first coil can include a first input of the common mode inductance and a first output of the common mode inductance, and the second coil can include a second input of the common mode inductance and a second output of the common mode inductance.

[0146] It can be understood that the first filter capacitor can constitute an EMI filter circuit together with the common mode inductance to filter out electromagnetic interference of the alternating current signal transmitted by the input end, and transmit the alternating current signal after filtering out the electromagnetic interference to the second filter circuit.

[0147] In some embodiments, as shown in Figure 2 The power supply circuit 10 can further include a fuse F1 connected between the input end 101 and one end of the first filter capacitor C x , and a thermistor NTC connected between the input end 101 and the other end of the first filter capacitor C x . The negative temperature coefficient (NTC) thermistor can protect the input end together with the fuse.

[0148] In some embodiments, as shown in Figure 2 The second filter circuit 17 includes:

[0149] a rectifier bridge BD1 connected between the first output of the common mode inductance LF1 and the second output of the common mode inductance LF1, and connected between the first energy storage module 11 and the first switch module 13;

[0150] a filter inductance L1 connected between the rectifier bridge BD1 and the first energy storage module 12;

[0151] a second filter capacitor C2, one end of which is connected to a connection line between the rectifier bridge BD1 and the filter inductance L1, and the other end of which is connected to a connection line between the rectifier bridge BD1 and the first switch module 13;

[0152] a third filter capacitor C3, one end of which is connected to a connection line between the filter inductance L1 and the first energy storage module 11, and the other end of which is connected to a connection line between the rectifier bridge BD1 and the first switch module 13.

[0153] In this way, the AC signal after filtering out electromagnetic interference can be rectified by setting a rectifier bridge, and the DC signal after rectification can be filtered by a CLC filter circuit consisting of a second filter capacitor, a filter inductor and a third filter capacitor in sequence to obtain a stable DC signal. This allows a stable DC voltage to be input to the first energy storage module, thereby effectively improving the charging efficiency of the power adapter where the power supply circuit is located.

[0154] In this embodiment of the disclosure, the rectifier bridge can be a device in the power supply circuit that rectifies the AC signal after filtering out electromagnetic interference to obtain a pulsating DC signal.

[0155] Here, the rectifier bridge is a rectifier circuit consisting of four diodes connected in a bridge configuration and packaged in a single housing. These four diodes play a crucial role in the circuit, converting alternating current (AC) into direct current (DC). During each operating cycle, only two diodes operate at a time. Through the unidirectional conduction function of the diodes, the AC signal is converted into a unidirectional pulsating DC signal.

[0156] The second filter capacitor, the filter inductor, and the third filter capacitor can form a CLC filter circuit, which can convert the pulsating DC signal output by the rectifier bridge into a stable DC signal and input a stable DC signal to the first energy storage module.

[0157] It is understandable that when the first filter circuit transmits the AC signal after filtering out electromagnetic interference to the rectifier bridge, the rectifier bridge can convert the AC signal after filtering out electromagnetic interference into a pulsating DC signal and transmit the pulsating DC signal to the CLC filter circuit; the CLC filter circuit can convert the pulsating DC signal into a stable DC signal and transmit the stable DC signal to the first energy storage module.

[0158] For example, such as Figure 2 As shown, input terminal 101 can be protected by the thermistor NTC and fuse F1 before being fed into the first filter capacitor C. xThe EMI filter circuit composed of the common-mode inductor LF1 and the AC input signal AC can filter electromagnetic interference of the AC signal AC to obtain an AC signal filtered of electromagnetic interference. The rectifier bridge BD1 rectifies the AC signal to obtain a pulsating DC signal, which is then filtered by a CLC filter circuit composed of the second filter capacitor C2, the filter inductor L1 and the third filter capacitor C3 to obtain a stable DC signal, which is input to the first energy storage module 11. The first energy storage module 11, the second energy storage module 12, the first switch module 13, the resonant assembly Lr and the second switch module 14 perform power factor correction and voltage boosting, and finally output a high-voltage DC signal to the subsequent voltage conversion module DC / DC, which is transmitted to external equipment through the output terminal 102 to charge the external equipment.

[0159] As shown in Figure 2 and Figure 4 , when the first switch Q1 in the first switch module 13 is in a conducting state, the DC signal output by the second filter circuit 17 passes through the first energy storage module 11, such as the PFC inductor Lpfc, the first switch Q1 and the second filter circuit 17, to form a first energy storage loop; at this time, the PFC inductor Lpfc stores energy. At the same time, the DC signal can also pass through the second unidirectional conducting tube D2, the energy storage capacitor C f , the first switch Q1 and the second filter circuit 17 to form a second energy storage loop; at this time, the energy storage capacitor C f stores energy to share the energy on the PFC inductor Lpfc, reducing current ripple and stress. In this mode, the output side uses multiple first output capacitors such as EC1 and EC2 to provide energy to the subsequent voltage conversion module DC / DC, and at this time the third unidirectional conducting tube D3 is in a reverse blocking state.

[0160] As shown in Figure 2 and Figure 5 , when the first switch Q1 in the first switch module 13 and the auxiliary switch Q2 in the second switch module 14 are both in a cut-off state, the DC signal output by the second filter circuit 17 passes through the PFC inductor Lpfc, the energy storage capacitor C f and the third unidirectional conducting tube D3 to the subsequent voltage conversion module DC / DC, realizing direct energy supply.

[0161] As shown in Figure 2 and Figure 6As shown, before the first switch tube Q1 in the first switch module 13 is controlled to be turned on, the auxiliary switch tube Q2 can be controlled to be turned on at a preset duty ratio, that is, when the second switch module 14 is in a turn-on state and the first switch module 13 is in an off state, the resonance component Lr (such as a resonance inductor) and the energy storage capacitor C f The resonance is started, and the generated resonance current discharges the parasitic capacitor C1 of the first switch tube Q1; when the voltage of the parasitic capacitor C1 decreases to 0, the body diode D1 of the first switch tube Q1 is turned on to continue the current, the auxiliary switch tube Q2 is turned off, and the first switch tube Q1 is turned on, so that the first switch tube Q1 realizes the soft switching technology.

[0162] It should be noted that, referring to Figures 4 to 6 When the first switch tube Q1 is in a turn-on state, the voltage of the PFC inductor Lpfc can be Vin; when the first switch tube Q1 is in an off state, the voltage of the PFC inductor Lpfc can be Vin+Vcf-Vout=2Vin-Vout. According to the principle that the average voltage of the PFC inductor Lpfc in a preset period is 0, the boost ratio, that is, Vout / Vin=(1 / 1-d)+1, can be obtained. Wherein, d can be the duty ratio of the first switch tube Q1, that is, the proportion of the turn-on time of the first switch tube Q1 to the preset period. Therefore, the boost ratio of the power supply circuit of the embodiment of the present disclosure is greater than the boost ratio in the conventional boost converter.

[0163] As shown in Figure 7 L1 identifies the output voltage of the output end of the power supply circuit; at this time, the input voltage of the input end can be 200V, and according to the above boost ratio formula, the output voltage of the output end can be boosted from 200V to 796V. And as shown in Figure 8 L2 identifies the voltage between the source and the drain of the first switch tube Q1, L3 identifies the driving voltage of the first switch tube Q1, that is, the voltage input to the gate of the first switch tube Q1, and L4 identifies that when the voltage between the source and the drain of the first switch tube Q1 decreases to 0, the voltage input to the gate of the first switch tube Q1 is controlled, that is, the first switch tube Q1 is driven to be turned on, so that the first switch module realizes the soft switching technology.

[0164] In addition, the relationship between the current I flowing through the PFC inductor Lpfc and the output current Iout of the output end can be Iout=IL(1-d); wherein L can be the inductance value of the PFC inductor Lpfc. According to the mapping relationship between the voltage of the PFC inductor Lpfc and the ripple ratio and the volume, it can be obtained that the inductance volume of the PFC inductor Lpfc can be reduced by 1 to 3 times when the boost ratio is greater than 2, thereby reducing the volume of the overall power supply circuit.

[0165] In the related art, for the PD adapter of consumer electronics products, a mature quasi-resonant (QR) flyback converter is used below 70 watts (W) power segment, and a PFC circuit is added to the original QR flyback converter between 70 W and 130 W. When the power is higher than 135 W, due to the limitation of the efficiency of the adapter, the loss proportion of the transformer in the adapter is high, so a larger transformer has to be used, but this is not conducive to the miniaturization demand of the consumer electronics industry. Therefore, soft switching technologies such as asymmetric half bridge (AHB), audio video coding standard (AVS), active clamp flyback (ACF) and the like are used around 135 W to 240 W, which reduces the loss and improves the efficiency of the adapter by using the soft switching technology, so the transformer can tend to be miniaturized.

[0166] Due to the introduction of the soft switching technology in the circuit of the adapter, the efficiency of the main power loop of the adapter is improved. Therefore, in the high-power segment, the factor that limits the further reduction of the volume is changed from QR, AHB or resonant conversion circuit LLC to the PFC circuit in the front stage of the adapter; that is, in the low-voltage and high-current scenario, the loss of the PFC circuit in the adapter will occupy a dominant position, such as the loss of the PFC circuit including the loss caused by the PFC switch and the inductor. However, the PFC circuit in the adapter cannot improve the overall efficiency of the adapter while reducing the overall volume of the adapter.

[0167] Based on this, the embodiments of the present disclosure can set a first switch module on the first energy storage loop between the input end and the first energy storage module, and on the second energy storage loop between the input end and the second energy storage module, so that when the first energy storage loop and the second energy storage loop are both turned on, the second energy storage module can be used to share the energy stored in the first energy storage module. On the one hand, the current flowing through the first energy storage module can be reduced to reduce the energy storage parameter of the first energy storage module, so as to reduce the volume of the first energy storage module and the volume of the overall power supply circuit; on the other hand, the current ripple in the power supply circuit can be reduced, thereby reducing the energy loss in the power supply circuit and improving the overall efficiency of the power supply adapter in which the power supply circuit is located; in addition, when the second switch module is in the on state and the first switch module is in the off state, the resonant component and the second energy storage module can resonate, so that the first switch module can be turned on or turned off under the condition of zero voltage or zero current, which helps the first switch module to realize soft switching technology, thereby more effectively reducing electromagnetic interference and loss in the power supply circuit and effectively improving the charging efficiency of the power supply adapter in which the power supply circuit is located.

[0168] The power adapter provided by the embodiments of the present disclosure at least comprises:

[0169] The power supply circuit as described in the above embodiments of the present disclosure;

[0170] The control module is connected to the first switch module of the power supply circuit, and is configured to control the switching state of the first switch module.

[0171] In the embodiments of the present disclosure, the power adapter can be a mobile phone charger, a computer charger, or a charging adapter, and the like, and is not limited to this.

[0172] Here, the power adapter can charge any external device, and the external device can include, but is not limited to, a mobile phone, a tablet personal computer (Tablet Personal Computer, Tablet PC), a personal digital assistant (Personal Digital Assistant, PDA), a mobile Internet device (Mobile Internet Device, MID), a wearable device (Wearable Device), and the like.

[0173] The control module can be a microcontroller unit (Microcontroller Unit, MCU) in the power adapter.

[0174] It can be understood that the control module can control the first switch module or the second switch module of the power supply circuit, for example, control the gate input high level signal or low level signal of the field effect tube to control the first switch module or the second switch module to be in the on or off state.

[0175] In the embodiments of the present disclosure, the first switch module can be arranged on the first energy storage loop between the input end and the first energy storage module in the power supply circuit, and on the second energy storage loop between the input end and the second energy storage module, so that when the control module controls the first energy storage loop and the second energy storage loop to be in the on state, the second energy storage module can be used to share the energy stored in the first energy storage module. On the one hand, the current flowing through the first energy storage module can be reduced to reduce the energy storage parameter of the first energy storage module, so as to reduce the volume of the first energy storage module and the volume of the overall power supply circuit; on the other hand, the current ripple in the power supply circuit can be reduced, thereby reducing the energy loss in the power supply circuit and improving the overall efficiency of the power adapter. In addition, when the second switch module is in the on state and the first switch module is in the off state, the resonant assembly and the second energy storage module can resonate, so that the first switch module can be turned on or off under the condition of zero voltage or zero current, which helps the first switch module to realize soft switching technology, thereby more effectively reducing electromagnetic interference and loss in the power supply circuit and effectively improving the charging efficiency of the power adapter.

[0176] It is also to be noticed that the term "comprising", "including", and "having" or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises, includes or has a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a", "has... a", "includes... a", or "including a", does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus.

[0177] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the features disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the disclosure being indicated by the following claims.

[0178] It is to be understood that the disclosure is not limited to the precise structures herein described and illustrated in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the disclosure is limited only by the claims appended hereto.

Claims

1. A power supply circuit, characterized by comprising: The power supply circuit comprises: a first energy storage module connected between an input end and an output end of the power supply circuit; a second energy storage module connected between the input end and the output end and arranged in parallel with the first energy storage module; a first switch module connected in a first energy storage loop between the input end and the first energy storage module and connected in a second energy storage loop between the input end and the second energy storage module; wherein when the first energy storage loop and the second energy storage loop are both conductive, the input end transmits energy to the first energy storage module and the second energy storage module.

2. The power supply circuit of claim 1, wherein, The power supply circuit further comprises: a resonance component connected at one end to a connection line between the second energy storage module and the output end and connected at the other end to a connection line between the input end and the output end; a second switch module connected at one end to the resonance component and connected at the other end to the connection line between the input end and the output end; when the second switch module is in a conductive state and the first switch module is in a non-conductive state, the resonance component and the second energy storage module resonate.

3. The power supply circuit of claim 2, wherein, The first switch module comprises: a first switch tube connected at one end to a connection line between the first energy storage module and the second energy storage module and connected at the other end to a connection line between the input end and the second switch module; a first unidirectional conduction tube and a parasitic capacitor, both of which are connected in parallel across the first switch tube; when the second switch module is in a conductive state and the first switch tube is in a non-conductive state, a resonance current generated by the resonance component and the second energy storage module discharges the parasitic capacitor; when the voltage of the parasitic capacitor drops to zero, the first unidirectional conduction tube is in a reverse bias state.

4. The power supply circuit of claim 2, wherein The second energy storage module comprises: an energy storage capacitor connected between the first energy storage module and the output end and connected to the resonance component, for storing energy on the second energy storage module when the first switch module is in a conductive state, and for resonating with the resonance component when the second switch module is in a conductive state and the first switch module is in a non-conductive state; a second unidirectional conduction tube connected between the input end and the energy storage capacitor, for inhibiting the backflow of transmitted energy when the energy storage capacitor transmits energy to the output end.

5. The power supply circuit of claim 4, wherein, The power supply circuit further comprises: a third unidirectional conduction tube connected between the energy storage capacitor and the output end; a plurality of first output capacitors arranged in parallel between the third unidirectional conduction tube and the input end; when the first switch module is in a conductive state, the third unidirectional conduction tube is in a reverse bias state, and the first output capacitors transmit energy to the output end; when the first switch module and the second switch module are both in a non-conductive state, the third unidirectional conduction tube is in a forward bias state, and the input end transmits energy to the first output capacitors through the first energy storage module, the energy storage capacitor, and the third unidirectional conduction tube.

6. The power supply circuit of claim 5, wherein, The power supply circuit further comprises: a voltage conversion module connected between the first output capacitor and the output end; A second output capacitor is connected in parallel across the voltage conversion module and in parallel with the output terminal.

7. The power supply circuit according to any one of claims 1 to 6, characterized by, The power supply circuit further comprises: A first filter circuit is connected between the input terminal and the first energy storage module, and is configured to filter electromagnetic interference from the AC signal input by the input terminal. A second filter circuit is connected between the first filter circuit and the first energy storage module, and is configured to convert the AC signal filtered of electromagnetic interference into a DC signal.

8. The power supply circuit of claim 7, wherein, The first filter circuit comprises: A first filter capacitor is connected in parallel with the input terminal. A common mode inductor has a first input terminal connected to one end of the first filter capacitor, a second input terminal connected to the other end of the first filter capacitor, and a first output terminal and a second output terminal both connected to the second filter circuit.

9. The power supply circuit of claim 8, wherein, The second filter circuit comprises: A rectifier bridge is connected between the first output terminal of the common mode inductor and the second output terminal of the common mode inductor, and is connected to the first energy storage module and the first switch module. A filter inductor is connected between the rectifier bridge and the first energy storage module. A second filter capacitor has one end connected to a connection line between the rectifier bridge and the filter inductor, and the other end connected to a connection line between the rectifier bridge and the first switch module. A third filter capacitor has one end connected to a connection line between the filter inductor and the first energy storage module, and the other end connected to a connection line between the rectifier bridge and the first switch module.

10. A power adapter, characterized by The power supply circuit comprises: The power supply circuit according to any one of claims 1 to 9; A control module is connected to the first switch module of the power supply circuit, and is configured to control the switching state of the first switch module.

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