Power supply circuits, power adapters and electronic devices

Abstract

This disclosure relates to a power supply circuit, a power adapter, and an electronic device. The power supply circuit includes at least two flyback converter units. On the voltage input side, the at least two flyback converter units are connected in series between two voltage input terminals. On the voltage output side, the at least two flyback converter units are connected in parallel between two voltage output terminals. The at least two flyback converter units are configured to receive control signals and, according to the control signals, control at least one of the at least two flyback converter units to release energy, while the other flyback converter units store energy. This effectively achieves wide-range voltage regulation and improves the overall efficiency of the power supply circuit.

Description

Technical Field

[0001] This disclosure relates to the field of power supply technology, and in particular to a power supply circuit, a power adapter, and an electronic device. Background Technology

[0002] With the rapid development of technology, power adapters, as key energy components for various electronic devices, are constantly expanding in terms of technology and application scope. Especially in application scenarios requiring high power output, such as reaching or exceeding 135W, and particularly when charging electronic devices that meet the wide-range power management requirements of the PD (Power Delivery) 3.1 standard, the power circuitry inside current power adapters faces a major challenge: how to effectively achieve wide-range voltage regulation and improve the overall efficiency of the power circuitry. Summary of the Invention

[0003] This disclosure provides a power supply circuit, a power adapter, and an electronic device. The power supply circuit includes at least two flyback converter units. On the voltage input side, the at least two flyback converter units are connected in series between two voltage input terminals. On the voltage output side, the at least two flyback converter units are connected in parallel between two voltage output terminals. The flyback converter units control at least one of the at least two flyback converter units to release energy according to a received control signal, while the other flyback converter units store energy. This effectively achieves wide-range voltage regulation and improves the overall efficiency of the power supply circuit. The technical solution of this disclosure is as follows:

[0004] The first aspect of this disclosure provides a power supply circuit, including:

[0005] At least two flyback converter units; wherein,

[0006] On the voltage input side, the at least two flyback converter units are connected in series between the two voltage input terminals.

[0007] On the voltage output side, the at least two flyback converter units are connected in parallel between the two voltage output terminals;

[0008] The at least two flyback converter units are configured to receive control signals and, according to the control signals, control at least one of the at least two flyback converter units to release energy, while the other flyback converter units store energy.

[0009] A second aspect of this disclosure provides a power adapter, comprising: a power supply circuit and a control circuit as described above; wherein,

[0010] The control circuit is used to generate and send control signals to the power supply circuit;

[0011] The power supply circuit is used to control at least one of the at least two flyback converter units in the power supply circuit to release energy according to the received control signal, and the other flyback converter units in the at least two flyback converter units to store energy.

[0012] A third aspect of this disclosure provides an electronic device including a power adapter as described above.

[0013] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0014] The power supply circuit of this embodiment includes at least two flyback converter units; wherein, on the voltage input side, at least two flyback converter units are connected in series between two voltage input terminals; on the voltage output side, at least two flyback converter units are connected in parallel between two voltage output terminals; the at least two flyback converter units are used to receive control signals and, according to the control signals, control at least one of the at least two flyback converter units to release energy, and the other flyback converter units to store energy, thereby effectively realizing wide-range voltage regulation and improving the overall efficiency of the power supply circuit.

[0015] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure, and are not intended to unduly limit this disclosure.

[0017] Figure 1 This is a schematic diagram of a power supply circuit according to an embodiment of the present disclosure;

[0018] Figure 2 This is a circuit diagram of a power supply circuit according to an embodiment of the present disclosure;

[0019] Figure 3 This is a schematic diagram of a power supply circuit according to an embodiment of the present disclosure when the first switch is closed and the second switch is turned off;

[0020] Figure 4 This is a schematic diagram of a power supply circuit according to an embodiment of the present disclosure when the first switch is turned off and the second switch is closed;

[0021] Figure 5This is a current waveform diagram of the first flyback converter unit and the second flyback converter unit in a power supply circuit according to an embodiment of the present disclosure when the excitation inductance parameters are the same;

[0022] Figure 6 This is a current waveform diagram of the first flyback converter unit and the second flyback converter unit in a power supply circuit according to an embodiment of the present disclosure when the excitation inductance parameters deviate;

[0023] Figure 7 This is a schematic diagram of a power adapter according to an embodiment of the present disclosure. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions of this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings.

[0025] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0026] The power supply circuit, power adapter, and electronic device according to embodiments of the present disclosure are described below with reference to the accompanying drawings.

[0027] Figure 1 This is a schematic diagram of a power supply circuit according to an embodiment of the present disclosure.

[0028] like Figure 1 As shown, the power supply circuit 100 of this embodiment includes at least two flyback converter units.

[0029] In this configuration, at least two flyback converters are connected in series between two voltage input terminals on the voltage input side; and at least two flyback converters are connected in parallel between two voltage output terminals on the voltage output side. The at least two flyback converters receive control signals and, based on these signals, control at least one of them to release energy, while the other flyback converters store energy.

[0030] In this embodiment, the two voltage input terminals include a first voltage input terminal and a second voltage input terminal; wherein, the first voltage input terminal is one of the positive voltage input terminal Vin+ and the negative voltage input terminal Vin-, and the second voltage input terminal can be the other of the positive voltage input terminal Vin+ and the negative voltage input terminal Vin-.

[0031] The two voltage output terminals include a first voltage output terminal and a second voltage output terminal; wherein, the first voltage output terminal is one of the positive voltage output terminal Vout+ and the negative voltage output terminal Vout-, and the second voltage input terminal can be the other of the positive voltage output terminal Vout+ and the negative voltage output terminal Vout-.

[0032] The power supply circuit 100 includes N flyback converter units (N is a positive integer greater than or equal to 2), namely the first flyback converter unit 10, the second flyback converter unit 20, ..., the Nth flyback converter unit N0.

[0033] On the voltage input side, these N flyback converter units are connected in series between two voltage input terminals (such as the positive voltage input terminal Vin+ and the negative voltage input terminal Vin-). That is, the first terminal of the first flyback converter unit 10 is connected to the positive voltage input terminal Vin+, the second terminal of the first flyback converter unit 10 is connected to the first terminal of the second flyback converter unit 20, and so on, until the second terminal of the Nth flyback converter unit N0 is connected to the negative voltage input terminal Vin-, forming a series input link.

[0034] At the voltage output terminals, these N flyback converter units are connected in parallel between two voltage output terminals (such as the positive voltage output terminal Vout+ and the negative voltage output terminal Vout-). That is, the third terminal of the first flyback converter unit 10, the third terminal of the second flyback converter unit 20, ..., the third terminal of the Nth flyback converter unit N0 are all connected to the positive voltage output terminal Vout+, and the fourth terminal of the first flyback converter unit 10, the fourth terminal of the second flyback converter unit 20, ..., the fourth terminal of the Nth flyback converter unit N0 are all connected to the negative voltage output terminal Vout-, forming a parallel output network.

[0035] The control signals received by each flyback converter unit may come from two sources:

[0036] In the first scenario, the control signals received by each flyback converter unit may originate from a flyback chip that integrates multiple control circuits. This flyback chip is responsible for generating and sending control signals to all flyback converter units. In this case, all flyback converter units share a single flyback chip.

[0037] In the second scenario, each flyback converter unit corresponds to a flyback chip equipped with a control circuit. This means that multiple independent flyback chips are used to generate the control signals required by each flyback converter unit. In this case, each flyback converter unit has its own flyback chip.

[0038] The control circuits of these control chips comprehensively judge based on electrical parameters such as input voltage (i.e., the voltage difference between two voltage input terminals) and target output voltage (i.e., the voltage that needs to be maintained between two voltage output terminals), and then generate and issue corresponding control signals to adjust the operating state of the flyback converter unit, so as to precisely control the energy storage (e.g., storing energy in the magnetizing inductor on the primary side of the transformer in the flyback converter unit) and release (e.g., releasing energy to the load on the secondary side of the transformer). After receiving the control signal, at least two flyback converter units control at least one of the at least two flyback converter units to release energy, while the other flyback converter units store energy. This allows the power supply circuit 100 to efficiently convert the stored energy into electrical energy while storing the energy, thereby reducing energy loss.

[0039] The power supply circuit of this disclosure employs multiple independent flyback converter units. This design not only facilitates modular design, production, and subsequent maintenance but also significantly improves system reliability and scalability. On the voltage input side, by connecting at least two flyback converter units in series, the power supply circuit can adapt to a wider input voltage range. Simultaneously, by adjusting the operating state of each flyback converter unit, the output voltage, current, and power can be flexibly adjusted to meet different application requirements. On the voltage output side, by connecting at least two flyback converter units in parallel, the load current can be effectively distributed, thereby reducing the current stress on a single flyback converter unit and further improving the overall efficiency of the power supply circuit.

[0040] Figure 2 This is a circuit diagram of a power supply circuit according to an embodiment of the present disclosure.

[0041] like Figure 2 As shown, the power supply circuit 100 of this embodiment includes at least two flyback converter units, including: a first flyback converter unit 10 and a second flyback converter unit 20. The two voltage input terminals include a first voltage input terminal (the first voltage input terminal is described as Vin+) and a second voltage input terminal (the second voltage input terminal is described as Vin-). The two voltage output terminals include a first voltage output terminal (the first voltage output terminal is described as Vout+) and a second voltage output terminal (the second voltage output terminal is described as Vout-).

[0042] On the voltage input side, the first terminal of the first flyback converter 10 is connected to the first voltage input terminal Vin+, the second terminal of the first flyback converter 10 is connected to the first terminal of the second flyback converter 20, and the second terminal of the second flyback converter 20 is connected to the second voltage input terminal Vin-.

[0043] On the voltage output side, the third terminal of the first flyback converter unit 10 and the third terminal of the second flyback converter unit 20 are both connected to the first voltage output terminal Vout+, and the fourth terminal of the first flyback converter unit 10 and the fourth terminal of the second flyback converter unit 20 are both connected to the second voltage output terminal Vout-.

[0044] The control signal is used to control the first flyback converter 10 and the second flyback converter 20 to alternately store and release energy.

[0045] The power supply circuit of this embodiment employs two reverse flyback converters. By connecting the two reverse flyback converters in series on the voltage input side and in parallel on the voltage output side, the power supply circuit can adapt to a wider input voltage range while ensuring the stability of the output voltage and current.

[0046] like Figure 2 As shown, the first flyback converter unit 10 includes: a first magnetizing inductor Lm1 and a first converter T. rA and the first switching transistor Q A ;in,

[0047] The first terminal of the first excitation inductor Lm1 and the first converter T rA The connection point between the first ends of the primary and intermediate coils serves as the first end of the first flyback converter unit 10.

[0048] First switching transistor Q A The first terminal, connected to the second terminal of the first magnetizing inductor Lm1 and the first converter T rA The connection point between the second ends of the primary and secondary coils is connected, and the first switching transistor Q is connected. A The second end serves as the second end of the first flyback converter unit 10;

[0049] First converter T rA The first end of the intermediate secondary coil serves as the third end of the first flyback converter unit 10;

[0050] First converter T rA The second end of the intermediate secondary coil serves as the fourth end of the first flyback converter unit 10;

[0051] First switching transistor Q A The third terminal is used to receive control signals to control the first switching transistor Q. AThe on / off state; wherein, the control signal controls the first switch Q. A When in the ON state, energy is stored through the first magnetizing inductor Lm1; the first switching transistor Q is controlled by the control signal. A When in the off state, energy is released through the first magnetizing inductor Lm1.

[0052] It should be noted that the first switching transistor Q A It can be a field-effect transistor or a bipolar junction transistor, wherein the first switching transistor Q... A The first terminal is the source or collector, and the first switch Q is... A The second terminal is the drain or emitter, and the first switching transistor Q A The third terminal is either the gate or the base. First converter T rA The turns ratio of the primary coil to the secondary coil is N. A :1.

[0053] In this embodiment, the first switch Q A Let's take a field-effect transistor as an example. The first switching transistor Q... A When the received control signal is a high-level signal, the circuit is turned on, and energy is stored through the first magnetizing inductor Lm1. When the received control signal is a low-level signal, the circuit is turned off, and energy is released through the first magnetizing inductor Lm1.

[0054] like Figure 2 As shown, the second flyback converter unit 20 includes: a second magnetizing inductor Lm2 and a second converter T. rB Second switch Q B ;in,

[0055] The first terminal of the second excitation inductor Lm2 and the second converter T rB The connection point between the first ends of the primary coils serves as the first end of the second flyback converter unit 20.

[0056] Second switching transistor Q B The first terminal, the second terminal of the second magnetizing inductor Lm2, and the second converter T rB The connection point between the second terminals of the primary and secondary coils is connected, and the second switching transistor Q is connected. B The second end serves as the second end of the second flyback converter unit 20;

[0057] Second converter T rB The first end of the intermediate secondary coil serves as the third end of the second flyback converter unit 20;

[0058] Second converter T rB The second end of the intermediate secondary coil serves as the fourth end of the second flyback converter unit 20;

[0059] Second switching transistor Q B The third terminal is used to receive control signals to control the second switch Q. B The on / off state; wherein, in response to the control signal, the second switch Q is controlled. B When in the ON state, energy is stored through the second magnetizing inductor Lm2; the second switching transistor Q is controlled in response to the control signal. B When in the off state, energy is released through the second magnetizing inductor Lm2.

[0060] It should be noted that the second switch Q B It can be a field-effect transistor or a bipolar junction transistor, wherein the second switching transistor Q... B The first terminal is the source or collector, and the second switch Q is... B The second terminal is either the drain or the emitter, and the second switching transistor Q... B The third terminal is either the gate or the base. First converter T rB The turns ratio of the primary coil to the secondary coil is N. B :1.

[0061] In this embodiment, the second switch Q B The following explanation uses a field-effect transistor as an example. Specifically, the second switch Q... B When the received control signal is high, the circuit is turned on, and energy is stored through the second magnetizing inductor Lm2. When the control signal is low, the circuit is turned off, and energy is released through the second magnetizing inductor Lm2.

[0062] Therefore, the power supply circuit of this disclosure adopts a series-like configuration on the primary side of the transformer. However, the switching transistors in the first flyback converter unit and the second flyback converter unit are not turned on simultaneously, but are turned on complementaryly. The on / off control of the first and second switching transistors is performed by the duty cycle D, that is, the control signal can be a PWM signal.

[0063] like Figure 2 As shown, the power supply circuit 100 of this embodiment further includes: an energy storage unit 30; wherein,

[0064] The first end of the energy storage unit 30 is connected to the connection point between the second end of the first flyback converter unit 10 and the first end of the second flyback converter unit 20.

[0065] The second end of the energy storage unit 30 is connected to the connection point between the second end of the second flyback converter unit 20 and the second voltage input terminal Vin-.

[0066] The energy storage unit 30 is used to store energy during the energy storage process of the first flyback converter 10, or to release energy to the second flyback converter 20 during the energy release process of the first flyback converter 10.

[0067] like Figure 2 As shown, the energy storage unit 30 includes: an energy storage capacitor C f ;in,

[0068] Energy storage capacitor C f The first end serves as the first end of the energy storage unit 30;

[0069] Energy storage capacitor C f The second end serves as the second end of the energy storage unit 30.

[0070] The power supply circuit of this embodiment incorporates an energy storage unit, such as an energy storage capacitor C. f This allows the current flowing through the second flyback converter unit 20 and the current flowing through the first flyback converter unit 10 to be automatically balanced.

[0071] like Figure 2 As shown, the power supply circuit 100 of this embodiment further includes: a first diode D. pass ;in,

[0072] First diode D pass The anode is connected to the second end of the first flyback converter unit 10;

[0073] First diode D pass The cathode is connected to the first end of the second flyback converter unit 20.

[0074] The power supply circuit disclosed herein includes a diode D. pass diode D pass It can prevent the current in the second flyback converter unit 20 from flowing back to the first flyback converter unit 10.

[0075] like Figure 2 The first flyback converter unit 10 further includes: a second diode D. A ;in,

[0076] Second diode D A The anode, and the first converter T rA The first terminals of the intermediate and secondary coils are connected together;

[0077] Second diode D A The cathode is connected to the first voltage output terminal Vout+.

[0078] like Figure 2As shown, the second flyback converter unit 20 further includes: a third diode D B ;in,

[0079] Third diode D B The anode, and the second converter T rB The first terminals of the intermediate and secondary coils are connected together;

[0080] Third diode D B The cathode is connected to the first voltage output terminal Vout+.

[0081] like Figure 2 As shown, the power supply circuit 100 of this embodiment further includes a first filter capacitor C connected between two voltage input terminals (such as Vin+ and Vin-). in .

[0082] like Figure 2 As shown, the power supply circuit 100 of this embodiment further includes a second filter capacitor C connected between two voltage output terminals (such as Vout+ and Vout-). out .

[0083] The following is combined with Figure 3 and Figure 4 illustrate Figure 2 Working principle of the power supply circuit 100.

[0084] like Figure 3 As shown, when the first transistor Q A On, second transistor Q B When turned off, the input power supply Vin charges and stores energy in the first magnetizing inductor Lm1 of the first flyback converter unit 10, and also charges the energy storage capacitor C. f Energy storage and charging are performed. At this time, the second excitation inductor Lm2 in the second flyback converter unit 20 transfers the stored energy to the second transformer T. rB The secondary side is released, and the second transformer T rB The third diode D on the secondary side B When the circuit is turned on, energy is released to the power supply Vout on the output load side.

[0085] like Figure 4 As shown, when the second transistor Q B On, first transistor Q A When turned off, the energy stored in the first magnetizing inductor Lm1 in the first flyback converter unit 10 is transferred to the first transformer T. rA The secondary side is released, and the first transformer T rA The second diode D on the secondary side A When the circuit is turned on, energy is released to the power supply Vout on the load side, at which time the energy storage capacitor C... fThe energy stored in the capacitor is released to charge the second magnetizing inductor Lm2 in the second flyback converter unit 20. At this time, the energy storage capacitor C... f In this case, the energy is charged and stored by the current flowing through the first flyback converter unit 10, and the energy is released by the current flowing through the second excitation inductor Lm2 in the second flyback converter unit 20. According to the law of conservation of charge, the current flowing through the first flyback converter unit 10 and the current flowing through the second excitation inductor Lm2 in the second flyback converter unit 20 are automatically balanced.

[0086] The power supply circuit of this embodiment achieves continuous energy supply throughout the entire cycle by using a first flyback converter unit 10 and a second flyback converter unit 20 operating in a complementary manner. This feature not only significantly improves the overall efficiency and energy utilization of the power supply circuit, but also enables the energy storage capacitor C to... f The design requirements were reduced, thereby saving costs.

[0087] The power supply circuit of this embodiment uses a progressive connection method and is equipped with an energy storage capacitor C. f This design achieves automatic current balancing in two phases. It allows for the construction of a complete circuit topology using conventional flyback chips, eliminating the need for additional balancing circuitry and control chips. Parallel connections on the transformer secondary side reduce current stress, while series connections on the primary side reduce output ripple. This halves the power load on each transformer, resulting in more uniform heat treatment, improved manufacturability, and cost advantages.

[0088] In addition, the power supply circuit of this embodiment can achieve wide-range voltage regulation through the control of PWM control signal to meet the requirements of PD3.1. Even if two control circuits are used to control the corresponding flyback converter units respectively, it has a cost advantage compared with traditional AHB (Asymmetrical Half-Bridge) chips and LLC (Low Leakage Inductance Converter) chips and their control circuits.

[0089] To verify the effectiveness of the power supply circuit 100 in this embodiment, a simulation model was built for testing. After adjusting the magnetic inductance by 10%, the simulation results (such as...) were analyzed. Figure 5 and 6 As shown in the figure, A represents the current flowing through the first flyback converter unit 10, and B represents the current flowing through the second flyback converter unit 20. It can be seen that the current of the power supply circuit in this embodiment of the present disclosure hardly changes before and after the parameter deviation, achieving automatic balancing. This simulation result demonstrates the advantages of the power supply circuit 100 in this embodiment of the present disclosure in terms of stability and reliability.

[0090] The power supply circuit 100 of this disclosure can be applied to scenarios with high power requirements, especially for power requirements reaching or exceeding 135W. For example, it can be applied to scenarios that meet the PD3.1 standard and have extremely high requirements for cost control, such as power adapters for smartphones, laptops, tablets, as well as chargers for large appliances and electric bicycles.

[0091] In summary, the power supply circuit of this embodiment includes at least two flyback converter units; wherein, on the voltage input side, at least two flyback converter units are connected in series between two voltage input terminals; on the voltage output side, at least two flyback converter units are connected in parallel between two voltage output terminals; the at least two flyback converter units are used to receive control signals and, according to the control signals, control at least one of the at least two flyback converter units to release energy, and the other flyback converter units to store energy, thereby effectively achieving wide-range voltage regulation and improving the overall efficiency of the power supply circuit.

[0092] Figure 7 This is a schematic diagram of a power adapter according to an embodiment of the present disclosure.

[0093] like Figure 7 As shown, the power adapter 1000 of this embodiment includes: the power supply circuit 100 and the control circuit 200 as described above.

[0094] The control circuit 200 generates and sends control signals to the power supply circuit 100. The power supply circuit 100, based on the received control signals, controls at least one of the at least two flyback converter units in the power supply circuit 100 to release energy, and the other flyback converter units to store energy.

[0095] It should be noted that for details not disclosed in the power adapter of the embodiments of this disclosure, please refer to the details disclosed in the power circuit of the embodiments of this disclosure, which will not be repeated here.

[0096] The power adapter of this embodiment comprises the aforementioned power supply circuit and control circuit. The power adapter generates and sends control signals to the power supply circuit via the control circuit. Upon receiving the control signal, the power supply circuit controls at least one of the at least two flyback converter units in the power supply circuit to release energy, while the other flyback converter units store energy. Therefore, this power adapter can effectively achieve wide-range voltage regulation and improve the overall efficiency of the power adapter.

[0097] Based on the above embodiments, this disclosure also proposes an electronic device including the power adapter described above.

[0098] It should be noted that details not disclosed in the electronic devices of this disclosure embodiments are not provided here. Please refer to the details disclosed in the power adapter of this disclosure embodiments.

[0099] The electronic device of this disclosure embodiment, by using the power adapter described above, can achieve a wide range of voltage regulation and improve the overall efficiency of the power adapter.

[0100] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0101] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A power supply circuit, characterized in that, include: At least two flyback converter units; wherein, On the voltage input side, the at least two flyback converter units are connected in series between the two voltage input terminals. On the voltage output side, the at least two flyback converter units are connected in parallel between the two voltage output terminals; The at least two flyback converter units are configured to receive control signals and, according to the control signals, control at least one of the at least two flyback converter units to release energy, while the other flyback converter units store energy.

2. The power supply circuit according to claim 1, characterized in that, The at least two flyback converter units include a first flyback converter unit and a second flyback converter unit; the two voltage input terminals include a first voltage input terminal and a second voltage input terminal; and the two voltage output terminals include a first voltage output terminal and a second voltage output terminal. On the voltage input side, the first terminal of the first flyback converter unit is connected to the first voltage input terminal, the second terminal of the first flyback converter unit is connected to the first terminal of the second flyback converter unit, and the second terminal of the second flyback converter unit is connected to the second voltage input terminal. On the voltage output side, the third terminal of the first flyback converter unit and the third terminal of the second flyback converter unit are both connected to the first voltage output terminal, and the fourth terminal of the first flyback converter unit and the fourth terminal of the second flyback converter unit are both connected to the second voltage output terminal. The control signal is used to control the first flyback converter unit and the second flyback converter unit to alternately store and release energy.

3. The power supply circuit according to claim 2, characterized in that, The first flyback converter unit includes: a first magnetizing inductor, a first converter, and a first switching transistor; wherein, The connection point between the first end of the first excitation inductor and the first end of the primary coil in the first converter serves as the first end of the first flyback converter unit. The first end of the first switching transistor is connected to the connection point between the second end of the first magnetizing inductor and the second end of the primary coil in the first converter, and the second end of the first switching transistor serves as the second end of the first flyback converter unit. The first end of the secondary coil in the first converter serves as the third end of the first flyback converter unit; The second end of the secondary coil in the first converter serves as the fourth end of the first flyback converter unit; The third terminal of the first switching transistor is used to receive the control signal to control the on / off state of the first switching transistor; wherein, In response to the control signal, the first switch is controlled to be in the conducting state, and energy is stored through the first magnetizing inductor; In response to the control signal, the first switch is turned off, and energy is released through the first magnetizing inductor.

4. The power supply circuit according to claim 2, characterized in that, The second flyback converter unit includes: a second magnetizing inductor, a second converter, and a second switching transistor; wherein, The connection point between the first end of the second magnetizing inductor and the first end of the primary coil in the second converter serves as the first end of the second flyback converter unit. The first end of the second switching transistor is connected to the connection point between the second end of the second magnetizing inductor and the second end of the primary coil in the second converter, and the second end of the second switching transistor serves as the second end of the second flyback converter unit. The first end of the secondary coil in the second converter serves as the third end of the second flyback converter unit; The second end of the secondary coil in the second converter serves as the fourth end of the second flyback converter unit; The third terminal of the second switch is used to receive the control signal to control the on / off state of the second switch; wherein, In response to the control signal, the second switch is controlled to be in the conducting state, and energy is stored through the second magnetizing inductor; In response to the control signal, the second switch is controlled to be in the off state, and energy is released through the second magnetizing inductor.

5. The power supply circuit according to claim 2, characterized in that, The power supply circuit further includes: an energy storage unit; wherein, The first end of the energy storage unit is connected to the connection point between the second end of the first flyback converter unit and the first end of the second flyback converter unit; The second end of the energy storage unit is connected to the connection point between the second end of the second flyback converter unit and the second voltage input terminal; The energy storage unit is used to store energy during the energy storage process of the first flyback converter unit, or to release energy to the second flyback converter unit during the energy release process of the first flyback converter unit.

6. The power supply circuit according to claim 5, characterized in that, The energy storage unit includes: an energy storage capacitor; wherein, The first terminal of the energy storage capacitor serves as the first terminal of the energy storage unit. The second terminal of the energy storage capacitor serves as the second terminal of the energy storage unit.

7. The power supply circuit according to claim 2, characterized in that, The power supply circuit further includes: a first diode; wherein, The anode of the first diode is connected to the second terminal of the first flyback converter unit; The cathode of the first diode is connected to the first terminal of the second flyback converter unit.

8. The power supply circuit according to claim 3, characterized in that, The first flyback converter unit further includes: a second diode; wherein, The anode of the second diode is connected to the first terminal of the secondary coil in the first converter; The cathode of the second diode is connected to the first voltage output terminal.

9. The power supply circuit according to claim 4, characterized in that, The second flyback converter unit further includes: a third diode; wherein, The anode of the third diode is connected to the first terminal of the secondary coil in the second converter; The cathode of the third diode is connected to the first voltage output terminal.

10. The power supply circuit according to any one of claims 1-9, characterized in that, The power supply circuit further includes a first filter capacitor connected between the two voltage input terminals.

11. The power supply circuit according to any one of claims 1-9, characterized in that, The power supply circuit further includes a second filter capacitor connected between the two voltage output terminals.

12. A power adapter, characterized in that, include: The power supply circuit and control circuit as described in any one of claims 1-11; wherein, The control circuit is used to generate and send control signals to the power supply circuit; The power supply circuit is used to control at least one of the at least two flyback converter units in the power supply circuit to release energy according to the received control signal, and the other flyback converter units in the at least two flyback converter units to store energy.

13. An electronic device, characterized in that, include: The power adapter as described in claim 12.

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