Power supply circuit and electronic device

Abstract

The application provides a power supply circuit and electronic equipment, relates to the technical field of electronics, and solves the problem that the existing electronic equipment may bear excessive current in the working process, which leads to a safety hazard. The application comprises a power supply input end, at least two power supply output ends, at least two flyback conversion units and a flyback control unit. The flyback control unit is used for controlling the at least two flyback conversion units to be connected in parallel when the at least two power supply output ends output the second power supply. The power supply circuit of the application supports at least two-way simultaneous output, can realize output current sharing in the single-way output state, avoids that the output side of the power supply circuit bears excessive current, is safer in use, and can ensure that at least two-way output ports are independent of each other and do not affect each other in the at least two-way output state.

Description

Technical Field

[0001] This application relates to the field of electronic technology, specifically to a power supply circuit and electronic device. Background Technology

[0002] An adapter, also known as a power adapter, is used to charge devices. With the gradual development of power adapters, power adapters equipped with dual Type-C (a type of USB interface) output ports have appeared on the market.

[0003] Existing power adapters with dual Type-C output ports typically employ two DC-to-DC (Direct Current / Direct Current) converter circuits to step down the input power supply, thus achieving a solution for charging the dual Type-C output ports.

[0004] Existing power adapters have a problem during use: the main power output does not reach a sufficiently appropriate voltage, causing the power adapter's downstream circuitry to withstand excessive current, which poses a safety hazard. Summary of the Invention

[0005] This application provides a power supply circuit and electronic device that supports dual output ports, enables output current sharing in single-output mode, and ensures that multiple output ports output independently and do not affect each other in multi-output mode.

[0006] In a first aspect, this application provides a power supply circuit, comprising:

[0007] The power input terminal is used to provide the first power supply.

[0008] At least two power output terminals are provided for supplying a second power supply to an external load connected to the power supply circuit;

[0009] At least two flyback converter units are coupled to the power input terminal and to at least two power output terminals respectively, for converting the first power supply into the second power supply;

[0010] A flyback control unit is coupled to at least two of the flyback converter units. The flyback control unit is used to control the two flyback converter units to be connected in parallel when the second power supply is output at one of the power output terminals of the at least two power output terminals.

[0011] In one possible implementation of this application, the flyback converter unit includes:

[0012] The transformer section is coupled between the power input terminal and the power output terminal and is used to perform voltage transformation on the first power supply.

[0013] In one possible implementation of this application, the flyback converter unit further includes:

[0014] The synchronous rectification and filtering unit is coupled between the transformer unit and the power supply output terminal, and is used to rectify and filter the first power supply after voltage transformation.

[0015] In one possible implementation of this application, the flyback converter unit further includes:

[0016] The first control unit is coupled to the transformer unit and the synchronous rectification and filtering unit respectively, and is used to control the working state of the transformer unit and the synchronous rectification and filtering unit.

[0017] In one possible implementation of this application, the flyback converter unit further includes:

[0018] The power supply unit is coupled between the transformer unit and the first control unit and is used to convert the first power supply after voltage transformation into a third power supply, which is used to supply power to the first control unit.

[0019] In one possible implementation of this application, the flyback converter unit further includes:

[0020] The sampling unit, coupled to the first control unit and the power output terminal, is used to generate a sampling current when an external load is connected to the power output terminal.

[0021] In one possible implementation of this application, the flyback control unit includes:

[0022] A switching unit, coupled between the two flyback converter units, is used to control the connection or disconnection of the two flyback converter units;

[0023] The second control unit communicates bidirectionally with the first control unit and is coupled to the switch unit. The second control unit is used to receive the communication signal sent by the first control unit when it detects the sampling current, and to control the switch unit to turn on or off according to the communication signal.

[0024] In one possible implementation of this application, the switching unit includes a bidirectional switch, which includes two back-to-back switching transistors.

[0025] In one possible implementation of this application, the power supply circuit further includes:

[0026] At least two output switching units;

[0027] Each of the output switching units is coupled between a flyback converter unit and the power output terminal corresponding to the flyback converter unit, and is used to control the connection or disconnection of the flyback converter unit and the power output terminal corresponding to the flyback converter unit.

[0028] Secondly, this application provides an electronic device, which includes the power supply circuit described in any of the first aspects.

[0029] The power supply circuit of this application has at least two flyback converter units between the power input terminal and at least two power output terminals. When the second power supply is output from one of the at least two power output terminals, the flyback control unit controls the at least two flyback converter units to connect in parallel. At this time, the at least two flyback converter units simultaneously perform flyback conversion on the first power supply and simultaneously provide the second power supply to the power output terminal connected to the external load. This achieves the purpose of current sharing of the first power supply by the at least two flyback converter units and balanced output power of the at least two flyback converter units when there is a single output. When the second power supply is output from both at least two power output terminals, the flyback control unit controls the at least two flyback converter units to disconnect. At this time, the at least two flyback converter units work independently, so that the at least two power output terminals supply power to the outside at the same time. Therefore, the power supply circuit of this application supports at least two simultaneous outputs, can achieve output current sharing in the single output state, avoids excessive current on the output side of the power supply circuit, makes the use safer, and can ensure that the at least two output ports can output independently and without affecting each other in the at least two output state. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of an embodiment of the power supply circuit provided in this application.

[0032] Figure 2 This is a schematic diagram of an embodiment of the power supply circuit provided in this application.

[0033] Figure 3 This is a schematic diagram of an embodiment of the flyback converter unit provided in this application.

[0034] Figure 4 This is a schematic diagram of an embodiment of the flyback converter unit provided in this application.

[0035] Figure 5 This is a schematic diagram of an embodiment of the power supply circuit provided in this application.

[0036] Figure 6 This is a schematic diagram of an embodiment of the second control unit provided in this application.

[0037] Figure 7 This is a schematic diagram of an embodiment of the power supply circuit provided in this application.

[0038] Figure 8 This is a schematic diagram of an embodiment of the power supply circuit provided in this application. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0041] In this application, the term "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0042] Currently, some dual Type-C output adapters on the market use two DC-DC converter circuits to step down the input power and output it to each Type-C output port to achieve dual Type-C output port charging. Adapters that use two sets of DC / DC converter circuits are larger in size, have higher manufacturing costs, and have greater circuit losses during operation.

[0043] To solve this problem, some solutions use a single DC / DC converter circuit and divide the two Type-C output ports into a high-power Type-C output port and a low-power Type-C output port. When both Type-C output ports are connected to an external load, the high-power Type-C output port that is in operation must reduce its original high-power output to a low-power output, and then provide output to the other low-power Type-C output port through the DC / DC converter circuit.

[0044] While this solution addresses the issues of adapters with two separate DC / DC conversion circuits, the design process requires ensuring that the high-power Type-C output port can deliver sufficient power while maintaining compatibility with lower power outputs when both Type-C output ports are connected to external loads. This prevents insufficient power to meet the charging needs of external loads. Furthermore, during high-power output from the low-power Type-C output port, if the main power supply doesn't reach a sufficient voltage, excessive current can be applied to the synchronous rectification circuit and transformer secondary winding in the adapter, posing safety hazards and potentially leading to a poor user experience. Therefore, the solution of using a single DC / DC conversion circuit with both high-power and low-power Type-C output ports still presents several unresolved issues.

[0045] To address the aforementioned technical problems, this application provides a power supply circuit and an electronic device, which will be described in detail below.

[0046] like Figure 1 The diagram shown is a schematic representation of a power supply circuit according to an embodiment of this application. The power supply circuit includes a power input terminal 101, two power output terminals 102, two flyback converter units 201, and a flyback control unit 202. Specifically:

[0047] The power input terminal 101 is used to provide a first power supply to the aforementioned power circuit. The power input terminal can be directly connected to mains power or connected to an energy storage device to provide electrical energy to the power circuit. In this embodiment, the power input terminal 101 is connected to an external power source, which can be an AC power source, an AC / DC power source, a DC / DC power source, a regulated power source, a communication power source, a frequency converter, an inverter, an AC regulated power source, etc. This embodiment does not specifically limit the type of power source.

[0048] At least two power output terminals 102 are provided for supplying a second power supply to an external load connected to the power circuit. In this embodiment, the power output terminal 102 can be a USB Type-C interface or a USB Type-C male connector, or any other interface or connector capable of power transmission; this embodiment does not impose any specific limitations on this.

[0049] At least two flyback converter units 201 are coupled to the power input terminal 101 and to at least two power output terminals 102 respectively, for converting the first power supply into the second power supply. In this embodiment, the flyback converter unit 201 can be a specific flyback converter circuit.

[0050] A flyback control unit 202 is coupled to at least two flyback converter units 201. The flyback control unit 202 is used to control the at least two flyback converter units 201 to connect in parallel when a second power supply is output at one of the at least two power output terminals 102. In this embodiment, the flyback control unit 202 can be a specific flyback control circuit.

[0051] In this embodiment, the flyback control unit 202 also controls at least two flyback converter units 201 to disconnect when at least two power output terminals 102 are both outputting the second power supply.

[0052] When the second power supply is output from one of the at least two power output terminals 102, the flyback control unit 202 controls at least two flyback converter units 201 to connect in parallel. At this time, the at least two flyback converter units 201 simultaneously perform flyback conversion on the first power supply and simultaneously provide the second power supply to the power output terminal 102 connected to the external load. This achieves the purpose of current sharing between the at least two flyback converter units 201 and balanced output power for the at least two flyback converter units 201 when outputting in a single channel. When the second power supply is output from both at least two power output terminals 102, the flyback control unit 202 controls the at least two flyback converter units 201 to disconnect. At this time, the at least two flyback converter units 201 work independently, allowing the at least two power output terminals 102 to supply power to the outside simultaneously. Therefore, the power circuit of this application supports at least two simultaneous outputs, can achieve current sharing in the single-channel output state, avoids excessive current on the output side of the power circuit, makes the use safer, and can ensure that the at least two output ports output independently and do not affect each other in the at least two-channel output state.

[0053] In this embodiment, the power supply circuit further includes an input filter unit 203, which is coupled to the power input terminal 101 and is used to filter the first power supply.

[0054] In this embodiment, the input filtering unit 203 can be a specific input filtering circuit.

[0055] In this embodiment, as Figure 2 As shown, the input filter unit 203 includes a common-mode inductor LF101 and a first capacitor CX101, wherein the first capacitor CX101 is an X capacitor, and the common-mode inductor LF101 includes a first coil and a second coil. One end of the first coil and one end of the second coil are respectively coupled to the neutral wire and the live wire of the power input terminal 101, and the other end of the first coil and the other end of the second coil are respectively coupled to the two ends of the first capacitor CX101.

[0056] The common-mode inductor LF101 and the first capacitor CX101 work together to suppress common-mode interference in the AC power signal input to the power input terminal 101. Since different X capacitors have different high voltage withstand values, the capacitance value of the first capacitor CX101 can be adjusted according to the specific actual situation to change the cutoff frequency of the first capacitor CX101. This application does not make specific limitations on the component parameters of the common-mode inductor LF101 and the first capacitor CX101.

[0057] In this embodiment, other input filtering units 203 that can filter the first power supply can also be used. This application does not specifically limit the structure of the input filtering unit 203.

[0058] In this embodiment, the input filtering unit 203 further includes a first resistor R102 and a second resistor R103, which are connected in series and coupled to the two ends of the first capacitor CX101. The first resistor R102 and the second resistor R103 serve as the charging and discharging resistors for the first capacitor CX101, thereby enabling the charging and discharging function of the first capacitor CX101 and supplying power to the subsequent circuits of the power supply circuit.

[0059] In some embodiments, the input filter unit 203 further includes a fuse F101, which is coupled between the input filter unit 203 and the live wire of the power input terminal 101. When the circuit current abnormally rises to a certain level and temperature, the fuse F101 melts and cuts off the current, thus protecting the circuit.

[0060] In some embodiments, the power supply circuit further includes a rectifier unit 204, coupled to the input filter unit 203, for rectifying the first power supply.

[0061] In some embodiments, the rectifier unit 204 may be a specific rectifier circuit.

[0062] Specifically, the rectifier unit 204 includes a rectifier bridge BD101 composed of four independent rectifier diodes connected together. The two input terminals of the rectifier bridge BD101 are coupled to the two ends of the first capacitor CX101, and the two output terminals of the rectifier bridge BD101 are coupled to the π-type filter unit 205 (see below). The first power supply after filtering is rectified by the rectifier bridge BD101 to obtain the rectified first power supply.

[0063] In this embodiment, other rectifier units 204 that can rectify the first power supply can also be used. This application does not specifically limit the structure of the rectifier unit 204.

[0064] In some embodiments, the power supply circuit further includes a π-type filter unit 205, coupled to the rectifier unit 204, for further filtering the rectified first power supply.

[0065] In some embodiments, the π-type filter unit 205 can be a specific π-type filter circuit.

[0066] In some embodiments, the π-type filter unit 205 includes a first electrolytic capacitor EC101, a second electrolytic capacitor EC102, a third electrolytic capacitor EC103, and a first inductor L101. The positive and negative terminals of the first electrolytic capacitor EC101 are respectively coupled to the two output terminals of the rectifier bridge BD101. The two ends of the first inductor L101 are respectively coupled to the positive terminals of the first electrolytic capacitor EC101 and the second electrolytic capacitor EC102. The negative terminal of the second electrolytic capacitor EC102 is coupled to the negative terminal of the first electrolytic capacitor EC101. The positive and negative terminals of the third electrolytic capacitor EC103 are respectively coupled to the positive and negative terminals of the second electrolytic capacitor EC102. The negative terminals of the first electrolytic capacitor EC101, the second electrolytic capacitor EC102, and the third electrolytic capacitor EC103 are all coupled to ground.

[0067] In this embodiment, the first electrolytic capacitor EC101, the second electrolytic capacitor EC102, the third electrolytic capacitor EC103, and the first inductor L101 work together to further filter the rectified first power supply, thereby reducing the ripple current in the first power supply and making the first power supply more stable. At the same time, the first electrolytic capacitor EC101, the second electrolytic capacitor EC102, and the third electrolytic capacitor EC103 also play an energy storage role, which can store energy in the rectified first power supply. Through the continuous charging and discharging of the first electrolytic capacitor EC101, the second electrolytic capacitor EC102, and the third electrolytic capacitor EC103, the first power supply is transmitted to the subsequent circuit of the power supply circuit in the form of charging and discharging current.

[0068] This application employs at least two flyback converter units 201 to perform voltage conversion on the first power supply. Under the premise that the functions of the at least two flyback converter units 201 are the same, the at least two flyback converter units 201 can adopt the same circuit structure or different circuit structures. Therefore, in this application, the following describes one of the structures adopted by the flyback converter unit 201 and its functions using an example.

[0069] In one embodiment of this application, the flyback converter unit 201 includes:

[0070] The transformer section 2011 is coupled between the power input terminal 101 and the power output terminal 102 and is used to perform voltage transformation on the first power supply.

[0071] In this embodiment, as Figure 3As shown, the transformer section 2011 specifically includes a transformer T101a, which includes a primary winding, a first-stage winding, and a second-stage winding. The primary winding of the transformer T101a is coupled to the π-type filter unit 205, the first-stage winding of the transformer T101a is coupled to the synchronous rectification and filtering section 2013 (see below), and the second-stage winding of the transformer T101a is coupled to the power supply section 2015 (see below). The transformer T101a performs voltage transformation on the first power supply after rectification and filtering, and provides the first power supply transformed to a set voltage value to the synchronous rectification and filtering section 2013 and the power supply section 2015 respectively.

[0072] In this embodiment, the transformer unit 2011 may also adopt other circuit structures that can perform voltage transformation, and this application does not make specific limitations on this.

[0073] In this embodiment, the flyback converter unit 201 further includes a voltage absorption section 2012, which is coupled between the power input terminal 101 and the transformer section 2011, and is used to absorb the spike voltage generated by the primary coil of the transformer T101a.

[0074] In this embodiment, as Figure 3 As shown, the voltage absorption section 2012 specifically includes a second capacitor C113, a third resistor R105, a fourth resistor R117, and a first diode D103. One end of the second capacitor C113 is coupled to the positive terminal of the third electrolytic capacitor EC103, and the other end of the second capacitor C113 is coupled to the negative terminal of the first diode D103 through the fourth resistor R117. The two ends of the third resistor R105 are coupled to the two ends of the second capacitor C113. The first terminal 2 of the primary winding of the transformer T101a is coupled to one end of the third resistor R105, and the second terminal 1 of the primary winding of the transformer T101a is coupled to the positive terminal of the first diode D103.

[0075] In this embodiment, an RCD absorption circuit is formed by the second capacitor C113, the third resistor R105, the fourth resistor R117 and the first diode D103. When the primary coil of transformer T101a is turned on or off, the RCD absorption circuit absorbs the spike voltage generated by the primary coil of transformer T101a.

[0076] In some embodiments, the voltage absorption section 2012 may also employ other circuit structures that can absorb the spike voltage generated by the primary coil of the transformer T101a, and this application does not specifically limit this.

[0077] In some embodiments, the flyback converter unit 201 further includes:

[0078] The synchronous rectification and filtering unit 2013 is coupled between the transformer unit 2011 and the power output terminal 102, and is used to rectify and filter the first power supply after voltage transformation.

[0079] In some embodiments, such as Figure 3 As shown, the synchronous rectification and filtering section 2013 specifically includes a third switch Q203, a third capacitor C202, a twentieth resistor R261, and a twenty-first resistor R262. The third switch Q203 can be an N-channel metal-oxide-semiconductor field-effect transistor, i.e., an NMOS transistor, or a P-channel MOS transistor, i.e., a PMOS transistor. This embodiment does not make a specific limitation on this.

[0080] In some embodiments, a third body diode is coupled to the third switch Q203. The anode of the third body diode is coupled to the source of the third switch Q203, and the cathode of the third body diode is coupled to the drain of the third switch Q203. The gate of the third switch Q203 is coupled to the first control unit 2014 (see below). The drain of the third switch Q203 is coupled to the first terminal B of the first stage coil of the transformer T101a. The source of the third switch Q203 and the second terminal A of the first stage coil of the transformer T101a are both coupled to the power input terminal 101. One end of the third capacitor C202 is coupled to the drain of the third switch Q203 through the twentieth resistor R261, and the other end of the third capacitor C202 is coupled to the source of the third switch Q203. The twentieth resistor R262 is connected in parallel across the two ends of the twentieth resistor R261.

[0081] In this embodiment, the first power supply for voltage conversion is rectified and filtered by turning the third switch Q203 on and off; the third capacitor C202, the twentieth resistor R261, and the twenty-first resistor R262 together form an RC snubber circuit, which absorbs the spike voltage generated by the third switch Q203 during the turn-off process.

[0082] In this embodiment, the synchronous rectification and filtering unit 2013 further includes a twenty-second resistor R212. One end of the twenty-second resistor R212 is coupled to the drain of the third switching transistor Q203, and the other end is coupled to the first control unit 2014. The voltage of the primary winding of the transformer T101a is detected by the twenty-second resistor R212 to provide a reference for the first control unit 2014 to control the synchronous rectification of the third switching transistor Q203.

[0083] In this embodiment, the synchronous rectification and filtering unit 2013 further includes a ninth capacitor C205. One end of the ninth capacitor C205 is coupled to the source of the third switching transistor Q203, and the other end of the ninth capacitor C205 is coupled to the first control unit 2014. The ninth capacitor C205 serves as a decoupling capacitor, used to filter out interference in the output control signal of the first control unit 2014.

[0084] In this embodiment, the synchronous rectification and filtering unit 2013 may also adopt other circuit structures that can perform rectification and filtering on the first power supply after voltage transformation, and this application does not specifically limit it.

[0085] In this embodiment, the flyback converter unit 201 further includes:

[0086] The first control unit 2014 is coupled to the transformer unit 2011 and the synchronous rectification and filtering unit 2013 respectively, and is used to control the working state of the transformer unit 2011 and the synchronous rectification and filtering unit 2013.

[0087] In this embodiment, as Figure 3 As shown, the first control unit 2014 specifically includes a controller U101. The first control pin 24 of the controller U101 is coupled to the primary winding of the transformer T101a. The second control pin 11 of the controller U101 is coupled to the primary winding of the transformer T101a through a resistor R212. The third control pin 9 of the controller U101 is coupled to the gate of the third switching transistor Q203. The fourth control pin 4 of the controller U101 is coupled to the source of the third switching transistor Q203 through a capacitor C205.

[0088] In this embodiment, during the application process, a first power supply is connected to the power input terminal 101. After the first power supply is rectified and filtered by the input filter unit 203, the rectifier unit 204 and the π-type filter unit 205, the first power supply is transmitted to the flyback converter unit 201.

[0089] When the first control pin 24 of the controller U101 controls the primary winding of the transformer T101a to conduct, the second control pin 11, the third control pin 9 and the fourth control pin 4 of the controller U101 simultaneously control the third switch Q203 to turn off. At this time, the primary current and magnetic flux in the transformer T101a increase, thereby storing energy in the transformer T101a. The induced voltage in the primary winding of the transformer T101a is negative, and at this time, there is no energy release in the primary winding of the transformer T101a.

[0090] When the first control pin 24 of the controller U101 controls the primary winding of the transformer T101a to be cut off, the second control pin 11, the third control pin 9, and the fourth control pin 4 of the controller U101 simultaneously control the third switch Q203 to be turned on. At this time, the primary current and magnetic flux in the transformer T101a decrease, and since the induced voltage of the primary winding of the transformer T101a is positive, the transformer T101a is allowed to release the stored energy in the primary winding. That is, at this time, the transformer T101a outputs the first power supply after transformation in the primary winding. At the same time, the first power supply is rectified and filtered by the third switch Q203, and the rectified and filtered first power supply is transmitted to the power output terminal 102.

[0091] In one embodiment of this application, the flyback converter unit 201 further includes:

[0092] The power supply unit 2015 is coupled between the transformer unit 2011 and the first control unit 2014, and is used to convert the first power supply after voltage transformation into a third power supply, which is used to supply power to the first control unit 2014.

[0093] In this embodiment, as Figure 3 As shown, the power supply unit 2015 specifically includes a second diode D106, a fourth switch Q102 and a fifth resistor R106. The fourth switch Q102 can be an N-channel metal-oxide-semiconductor field-effect transistor, i.e., an NMOS transistor, or a P-channel MOS transistor, i.e., a PMOS transistor. This embodiment does not make a specific limitation on this.

[0094] The positive terminal of the second diode D106 is coupled to the first terminal 4 of the second stage coil of transformer T101a. The second terminal 3 of the second stage coil of transformer T101a is grounded. The negative terminal of the second diode D106 is coupled to the drain of the fourth switch Q102. The gate of the fourth switch Q102 is coupled to the fifth control pin 14 of controller U101. The source of the fourth switch Q102 is also coupled to the fifth control pin 14 of controller U101 through the fifth resistor R106. A fourth capacitor C104 is coupled between the fifth pin 14 and the sixth pin 13 of controller U101. The coupling point between the fourth capacitor C104 and the sixth pin 13 is grounded.

[0095] In this embodiment, when the power supply circuit is initially powered on, the power supply inside the controller U101 charges the fourth capacitor C104 through the fifth pin 14 to supply power to the primary side of the controller U101. When the power supply circuit starts normally, the first power supply is transmitted to the flyback converter unit 201 and the primary coil of the control transformer T101a is turned on by the first pin 24 of the controller U101. The first power supply output from the second secondary coil of the transformer T101a is rectified by the second diode D106 and transmitted to the fourth switch Q102. When the rectified first power supply meets the turn-on condition of the fourth switch Q102, the fourth switch Q102 is turned on; otherwise, it is not turned on. When the fourth switch Q102 is turned on, the converted third power supply is used to supply power to the primary side of the controller U101 through the fifth resistor R106, and the fourth capacitor C104 is charged at the same time.

[0096] In this embodiment, a Zener diode is coupled to the fourth switch Q102. The anode of the Zener diode is coupled to the source of the fourth switch Q102, and the cathode of the Zener diode is coupled to the drain of the fourth switch Q102. In this embodiment, the Zener diode in the fourth switch Q102 regulates the rectified first power supply to obtain a stable third power supply. In this embodiment, a circuit structure consisting of a transistor and a Zener diode connected in parallel can also be used to replace the fourth switch Q102 with an internal Zener diode as described in this application. Circuit structures that perform the same function as the fourth switch Q102 in this application are all within the protection scope of this application, and this embodiment does not specifically limit them.

[0097] In this embodiment, the power supply unit 2015 further includes a sixth resistor R107 and a fifth capacitor C129, which are connected in series. The other end of the sixth resistor R107 is coupled to the positive terminal of the second diode D106, and the other end of the fifth capacitor C129 is coupled to the negative terminal of the second diode D106. In this embodiment, the sixth resistor R107 and the fifth capacitor C129 together form an RC snubber circuit to absorb the voltage spikes generated during the turn-off process of the fourth switch Q102.

[0098] In this embodiment, the power supply unit 2015 further includes a fourth electrolytic capacitor C109, the positive terminal of which is coupled to the positive terminal of the second diode D106, and the negative terminal of which is grounded.

[0099] During application, when the first power supply is transmitted to the flyback converter unit 201 and the first pin 24 of the controller U101 controls the primary coil of the transformer T101a to conduct, the first power supply output from the secondary coil of the transformer T101a is rectified by the second diode D106 to charge and store energy in the fourth electrolytic capacitor C109. When the first pin 24 of the controller U101 controls the primary coil of the transformer T101a to be cut off, the fourth electrolytic capacitor C109 is discharged to continue to provide the first power supply to the fourth switch Q102.

[0100] In one embodiment of this application, the flyback converter unit 201 further includes:

[0101] The sampling unit 2017 is coupled to the first control unit 2014 and the power output terminal 102, and is used to generate a sampling current when an external load is connected to the power output terminal 102.

[0102] In this embodiment, as Figure 3 As shown, the sampling unit 2017 specifically includes a sampling resistor R204. One end of the sampling resistor R204 is coupled to the source of the third switching transistor Q203, and the other end of the sampling resistor R204 is coupled to the power output terminal 102. The seventh pin 1 and the eighth pin 2 of the controller U101 are respectively coupled to the two ends of the sampling resistor R204.

[0103] During application, when an external load is connected to the power output terminal 102 coupled to the sampling resistor R204, current flows through the circuit connected to the power output terminal 102, i.e., a sampling current is generated on the sampling resistor R204. Therefore, in this embodiment, the seventh pin 1 and the eighth pin 2 of the controller U101 are used to detect whether there is a sampling current on the sampling resistor R204, so as to determine whether there is an external load connected to the power output terminal 102 coupled to the sampling resistor R204.

[0104] In this embodiment, the sampling unit 2017 further includes a seventh resistor R215 and a sixth capacitor C225. One end of the seventh resistor R215 is coupled to the coupling point between the sampling resistor R204 and the power output terminal 102, and the other end of the seventh resistor R215 is coupled to the seventh pin 1 of the controller U101. The sixth capacitor C225 is coupled between the seventh pin 1 and the eighth pin 2 of the controller U101. In this embodiment, the seventh resistor R215 is used as a voltage divider resistor for the sixth resistor R204, and the sixth capacitor C225 is used for filtering to remove AC current from the sampling current.

[0105] In this embodiment, the controller U101 further includes a ninth pin 5 and a tenth pin 6. The ninth pin 5 and the tenth pin 6 of the controller U101 communicate with the second control unit 2022 (see below) to notify the second control unit 2022 whether an external load is connected to the power output terminal 102. In this embodiment, when the controller U101 detects a sampling current on the sampling resistor R204, the ninth pin 5 and the tenth pin 6 of the controller U101 communicate with the second control unit 2022, thereby determining that an external load has been connected to the power output terminal 102 coupled to the sampling resistor R204.

[0106] In this embodiment, the sampling unit 2017 may also adopt other circuit structures that can serve as sampling current, and this application does not specifically limit this.

[0107] In this application, since the power supply circuit includes N flyback converter units 201, N≥2, the power supply circuit may include two flyback converter units 201 or more flyback converter units 201; and each flyback converter unit 201 may adopt the same circuit structure or different circuit structures respectively.

[0108] For example, when N=2, that is, when the power supply circuit includes two flyback converter units 201, one flyback converter unit 201 can adopt the circuit structure of the flyback converter unit 201 described above, and the other can also adopt the circuit structure of the flyback converter unit 201 described above. Both flyback converter units 201 are coupled to the output terminal of the π-type filter unit 205. Figures 2 to 5 The node M shown is the coupling point between the two flyback converter units 201 and the π-type filter unit 205. That is, the structure of the other flyback converter unit 201 can be as follows: Figure 4 As shown, due to Figure 4 The structure of the flyback converter unit 201 shown is similar to Figure 3 The structures shown are identical and have the same function, therefore the structure of the other flyback converter unit 201 will not be described in detail (to distinguish the two flyback converter units 201, Figure 3 The and shown Figure 4 The components in the two flyback converter units 201 shown are labeled differently. The specific structure of the two flyback converter units 201 is subject to the attached drawings.

[0109] When N > 2, and the power supply circuit includes two or more flyback converter units 201, each of the two or more flyback converter units 201 can adopt... Figure 3 As shown or Figure 4The flyback converter unit 201 shown can also employ flyback converter units 201 with other circuit structures, or any N flyback converter units 201 from two or more flyback converter units 201 can be used. Figure 3 As shown or Figure 4 The flyback converter unit 201 shown is an example of another flyback converter unit 201 with a different circuit structure (not shown in the figure).

[0110] Therefore, regardless of whether two or more flyback converter units 201 are used, and regardless of whether each flyback converter unit 201 adopts the same circuit structure or a different circuit structure, any circuit structure that can perform the same function as at least two flyback converter units 201 in this application is within the protection scope of this application. Here, no specific limitation is made on the circuit structure adopted by two or more flyback converter units 201.

[0111] In one embodiment of this application, the power supply circuit further includes an output filter unit 206, coupled between the flyback converter unit 201 and the power output terminal 102, for filtering the first power supply after flyback conversion.

[0112] In this embodiment, the output filtering unit 206 can be a specific output filtering circuit.

[0113] In this embodiment, as Figure 3 As shown, the output filter unit 206 includes a fifth electrolytic capacitor EC205, which is coupled to the DC bus between the primary winding of transformer T101a and the power output terminal 102.

[0114] The first power supply output from the flyback converter unit 201 is filtered by the fifth electrolytic capacitor EC205 to obtain the second power supply for transmission to the power output terminal 102. The fifth electrolytic capacitor EC205 also serves as an energy storage function. When the flyback converter unit 201 provides the first power supply to the power output terminal 102, the fifth electrolytic capacitor EC205 converts the first power supply into the second power supply. At the same time, the fifth electrolytic capacitor EC205 is charged to store the first power supply. When the primary winding of the transformer T101a is in a state of no energy release, it discharges to the power output terminal 102 through the fifth electrolytic capacitor EC205 to continue to provide the second power supply to the power output terminal 102.

[0115] In this embodiment, the output filter unit 206 may also adopt other circuit structures that can play the roles of filtering and energy storage, and this application does not make specific limitations on this.

[0116] In one embodiment of this application, the flyback control unit 202 includes a switching unit 2021, specifically:

[0117] The switching unit 2021 is coupled between the two flyback converter units 201 and is used to control the connection or disconnection of the two flyback converter units 201.

[0118] The second control unit 2022 communicates bidirectionally with the first control unit 2014 and is coupled to the switch unit 2021. The second control unit is used to receive the communication signal sent by the first control unit when it detects the sampling current, and to control the switch unit 2021 to be turned on or off according to the communication signal.

[0119] In this embodiment, the switching unit 2021 includes a bidirectional switch, which includes two back-to-back switching transistors.

[0120] like Figure 5 As shown, the two back-to-back switching transistors can specifically include a first switching transistor Q205 and a second switching transistor Q207, with the first switching transistor Q205 and the second switching transistor Q207 connected in reverse series.

[0121] In this embodiment, a first body diode is internally coupled to the first switching transistor Q205. The anode of the first body diode is coupled to the source of the first switching transistor Q205, and the cathode of the first body diode is coupled to the drain of the first switching transistor Q205. A second body diode is internally coupled to the second switching transistor Q207. The anode of the second body diode is coupled to the source of the second switching transistor Q207, and the cathode of the second body diode is coupled to the drain of the second switching transistor Q207.

[0122] In this embodiment, the first switch Q205 and the second switch Q207 can both be N-channel metal-oxide-semiconductor field-effect transistors, i.e. NMOS transistors, or P-channel MOS transistors, i.e. PMOS transistors. The first switch Q205 and the second switch Q207 can be a combination of two transistors of any type. This embodiment does not make any specific limitation on this.

[0123] Specifically, such as Figure 5 As shown, the source of the first switch Q205 is coupled to the source of the second switch Q207, and the drain of the first switch Q205 is coupled to the DC bus between one of the flyback converter units 201 and its corresponding power output terminal 102. Figures 2 to 5 as well as Figures 7 to 8 Nodes Y1 and Y2 shown are the coupling points between the first switch Q205 and the DC bus. The source of the second switch Q207 is coupled to the DC bus between another flyback converter unit 201 and its corresponding power output terminal 102. Figures 2 to 5 as well as Figures 7 to 8Nodes K1 and K2 shown are the coupling points between the first switch Q205 and the DC bus. The gate of the first switch Q205 is coupled to the second control unit 2022 through the eighth resistor R241, and the gate of the second switch Q207 is coupled to the second control unit 2022 through the ninth resistor R243.

[0124] During application, when an external load is connected to one of the two power output terminals 102, the first control unit 2014 (controller U101 or controller U102) will communicate with the second control unit 2022 through pins 5 and 6 of controller U101 based on the sampled current on the corresponding sampling resistor (either sampling resistor R204 or sampling resistor R214). After determining that an external load is connected to one of the two power output terminals 102, the second control unit 2022 controls the first switch Q205 and the second switch Q2. When 07 is turned on, the two flyback converter units 201 are connected in parallel. Then, the second control unit 2022 writes the set power distribution value into the corresponding registers through the corresponding pins of the first control unit 2014 in the two flyback converter units 201. Then, the two first control units 2014 control the other parts in the two flyback converter units 201 to work, so as to realize the output current sharing of at least two flyback converter units 201, so that at least two flyback converter units 201 each bear a balanced output power, thereby solving the problem of excessive current bearing by the flyback converter unit 201 when the power supply circuit is in single-output state.

[0125] In this embodiment, the first switch Q205 and the second switch Q207 are connected in series between the two flyback converter units 201. The anode of the first body diode is coupled to the source of the first switch Q205, and the cathode of the first body diode is coupled to the drain of the first switch Q205. The anode of the second body diode is coupled to the source of the second switch Q207, and the cathode of the second body diode is coupled to the drain of the second switch Q207. This structure can prevent the voltage from the high-voltage output path of the two flyback converter units 201 from flowing into the low-voltage output path, thus preventing voltage backflow and making the overall power supply circuit safer.

[0126] In this embodiment, as Figure 5 and Figure 6 As shown, the second control unit 2022 specifically includes a controller U201;

[0127] Controller U201 includes pins SCL_A and SDA_A, which are coupled to pins 5 (ninth pin) and 6 (tenth pin) of controller U101, respectively. Pins SCL_A and SDA_A of controller U201 are used to enable bidirectional communication between controller U201 and controller U101.

[0128] The controller U201 also includes pins SCL_B and SDA_B, which are coupled to the first control unit 2014 in another flyback control unit 202. Pins SCL_B and SDA_B of the controller U201 are used to enable bidirectional communication between the controller U201 and the other first control unit 2014 (see attached figure for details).

[0129] The controller U201 also includes pins VOUT3G and VOUT4G, which are coupled to the eighth resistor R241 and the ninth resistor R243, respectively. Pins VOUT3G and VOUT4G of the controller U201 are used to control the first switch Q205 and the second switch Q207 to turn on or off, respectively.

[0130] In this embodiment, the controller U201 can be a PD protocol chip or other chips with the same control function. This embodiment does not make any specific limitations on this.

[0131] In this application, when N=2, that is, when the power supply circuit includes two flyback converter units 201, the power supply circuit correspondingly includes one flyback control unit 202. The flyback control unit 202 can be adopted as follows: Figure 5 The circuit structure shown can also be replaced with other circuit structures;

[0132] When N > 2, that is, when the power supply circuit includes two or more flyback converter units 201, for example, if the power supply circuit includes three flyback converter units 201, then the power supply circuit includes three flyback control units 202. Each pair of flyback converter units 201 is coupled to a flyback control unit 202. All three flyback control units 202 can adopt the following... Figure 5 The circuit structure shown can also employ other circuit structures, or a portion of the three flyback control units 202 can adopt a different circuit structure. Figure 5 The circuit structure shown is different from the other part (not shown in the attached diagram);

[0133] Therefore, regardless of whether one or more flyback control units 202 are used, and regardless of whether each flyback control unit 202 adopts the same circuit structure or different circuit structures, any circuit structure that can perform the same function as the flyback control unit 202 in this application is within the protection scope of this application. No specific limitation is made here regarding the circuit structure adopted by one or more flyback control units 202. In one embodiment of this application, the power supply circuit further includes:

[0134] At least two output switching units 207;

[0135] Each of the output switching units is coupled between a flyback converter unit 201 and the power output terminal 102 corresponding to the flyback converter unit 201, and is used to control the connection or disconnection of the flyback converter unit 201 and the power output terminal 102 corresponding to the flyback converter unit 201.

[0136] In this embodiment, the output switch unit 207 can be a specific output switch circuit.

[0137] In this embodiment, as Figure 7 As shown, the output switching unit 207 includes a fifth switching transistor Q206, a tenth resistor R234, an eleventh resistor R242, and a twelfth resistor R239;

[0138] The fifth switch Q206 can be an N-channel metal-oxide-semiconductor field-effect transistor, i.e., an NMOS transistor, or a P-channel MOS transistor, i.e., a PMOS transistor. This embodiment does not make a specific limitation on this.

[0139] In this embodiment, a fourth body diode is coupled to the fifth switch Q206. The anode of the fourth body diode is coupled to the source of the fifth switch Q206, and the cathode of the fourth body diode is coupled to the drain of the fifth switch Q206.

[0140] In this embodiment, the controller U201 also includes pins VINA, VOUT1G, and VOUT1; the gate of the fifth switch Q206 is coupled to pin VOUT1G of the controller U201 through the eleventh resistor R242, the drain of the fifth switch Q206 is coupled to the coupling point of the fifth electrolytic capacitor EC205 and the first stage coil of the transformer T101a, the drain of the fifth switch Q206 is also coupled to pin VINA of the controller U201 through the tenth resistor R234, the source of the fifth switch Q206 is coupled to the power output terminal 102, and is coupled to pin VOUT1 of the controller U201 through the twelfth resistor R239.

[0141] Since different external loads connected to the power output terminal have different power limits, during the application process, after the external load is connected to the power output terminal 102 and protocol communication is established with the external load, the controller U201 controls the fifth switch Q206 to turn on or off according to the power limit of the external load through pins VINA, VOUT1G, and VOUT1. When the power output to the power output terminal 102 meets the power limit requirements of the external load, the fifth switch Q206 is turned on; otherwise, the fifth switch Q206 is turned off. This avoids the risk of the voltage or current output by the power output terminal 102 to the external load exceeding the preset value within a specified time, which could damage the external load.

[0142] In this embodiment, the output switch unit 207 further includes a seventh capacitor C231, a thirteenth resistor R245, a fourteenth resistor R244, and a fifteenth resistor R247. The thirteenth resistor R245 is coupled to the output bus connected to the power output terminal 102. The two ends of the seventh capacitor C231 are coupled to the fourteenth resistor R244 and the fifteenth resistor R247, respectively. The other end of the fourteenth resistor R244 is coupled to one end of the thirteenth resistor R245, and the other end of the fifteenth resistor R247 is coupled to the other end of the thirteenth resistor R245.

[0143] In this embodiment, the controller U201 also includes pin CSN-A and pin CSP-A, and the two ends of the seventh capacitor C231 are respectively coupled to CSN-A and pin CSP-A of the controller U201.

[0144] In this embodiment, the seventh capacitor C231 absorbs the peak voltage generated in the output bus of the power output terminal 102, and the thirteenth resistor R245, the fourteenth resistor R244 and the fifteenth resistor R247 all play a damping role to consume the overvoltage output to the power output terminal 102, thereby suppressing the oscillation of the circuit and further avoiding the risk that the voltage or current output by the power output terminal 102 to the external load exceeds the preset value within a specified time, which may lead to damage to the external load.

[0145] In this embodiment, the output switching unit 207 further includes an eighth capacitor C222, which is coupled to the output bus connected to the power output terminal 102. The eighth capacitor C222 filters the second power supply output to the power output terminal 102.

[0146] In this embodiment, the output switch unit 207 may also adopt other circuit structures that can prevent overvoltage of the power output 102, and this application does not make specific limitations on this.

[0147] In one embodiment of this application, the power output terminal 102 includes a female USB-201, such as... Figure 7As shown, during the application process, the female USB-201 is connected to an external load to enable the power output terminal 102 to provide a second power supply to the external load.

[0148] In this embodiment, the female USB-201 is a 14-pin female connector, that is, the female USB-201 includes pins A4, B4, A9, B9, A5, B7, A7, B6, A6, B5, A1, B1, B12 and A12; in this embodiment, pins A4, B4, A9, B9, A1, B1, B12 and A12 of the female USB-201 are all coupled to the output bus connected to the power output terminal 102;

[0149] In this embodiment, the controller U201 also includes pins CC1A, DMA, DPA, and CC2A. Pins A5, A7, A6, and B5 of the female USB-201 are coupled to pins CC1A, DMA, DPA, and CC2A of the controller U201 through the sixteenth resistor R231, the seventeenth resistor R250, the eighteenth resistor R251, and the nineteenth resistor R233, respectively.

[0150] In this embodiment, when the female USB-201 is connected to an external load, protocol communication is achieved with the external load through the controller U201's pins CC1A, DMA, DPA, and CC2A.

[0151] Pins A5, A7, A6, and B5 of the female USB-201 are respectively coupled to the positive terminals of the first Zener diode D210, the second Zener diode D209, the third Zener diode D208, and the fourth Zener diode D207. The negative terminals of the first Zener diode D210, the second Zener diode D209, the third Zener diode D208, and the fourth Zener diode D207 are all grounded.

[0152] In this embodiment, the second power supply output to the USB-201 is regulated by the first Zener diode D210, the second Zener diode D209, the third Zener diode D208, and the fourth Zener diode D207. At the same time, it can prevent reverse flow and avoid the voltage of the external load from flowing back into the power supply circuit.

[0153] In this application, when N=2, that is, when the power supply circuit includes two flyback converter units 201, the power supply circuit includes two output switch units 207 respectively coupled to the two flyback converter units 201, and two power output terminals 102 respectively coupled to the two output switch units 207.

[0154] A set of output switching units 207 and power output terminals 102 in the power supply circuit can be adopted as follows: Figure 7 The circuit structure shown can be used in another part of the power supply circuit, which can also adopt the same circuit structure. That is, the other part of the power supply circuit can adopt the following... Figure 8 The circuit structure shown, due to Figure 7 The circuit structure shown is similar to Figure 8 The circuits shown have the same structure and function, therefore, no further details will be provided. Figure 8 The circuit structure shown will be described in detail (to distinguish between the output switch unit 207 and the power output terminal 102 in the two groups). Figure 7 The and shown Figure 8 The components in the output switch unit 207 and the power output terminal 102 shown are labeled differently. The specific structures of the output switch unit 207 and the power output terminal 102 in the two sets are as shown in the attached drawings.

[0155] When N>2, the power supply circuit includes two or more flyback converter units 201. For example, if the power supply circuit includes three flyback converter units 201, the power supply circuit includes three output switch units 207 that are respectively coupled to the three flyback converter units 201, and three power output terminals 102 that are respectively coupled to the three output switch units 207.

[0156] Each set of output switching units 207 and power output terminal 102 in the power supply circuit can be adopted as follows: Figure 7 The circuit structure shown can also be replaced with other circuit structures, or a portion of the three groups can be replaced with other structures. Figure 7 The circuit structure shown is different from the other part (not shown in the attached diagram);

[0157] Therefore, regardless of whether two output switch units 207 and two power output terminals 102 are used, or more than two output switch units 207 and more than two power output terminals 102 are used, and regardless of the circuit structure of the output switch units 207 and power output terminals 102, any circuit structure that can perform the same function as the output switch units 207 and power output terminals 102 in this application is within the protection scope of this application. Here, no specific limitation is made on the circuit structure used by the output switch units 207 and power output terminals 102.

[0158] In this application, when one of the two power output terminals 102 outputs a second power supply to an external load, the output power of the two power output terminals includes, but is not limited to, the following:

[0159] 5.0V / 9.0V / 12.0V / 15.0V 3.0A; 20.0V 2.25A;

[0160] When both power output terminals 102 simultaneously supply a second power to an external load, the output power of the two power outputs includes, but is not limited to, the following:

[0161] The first power output terminal 102: 5.0V 3.0A; 9.0V 2.22A; 12.0V 1.67A;

[0162] The second power output terminal 102: 5.0V 3.0A; 9.0V 2.22A; 12.0V 1.67A;

[0163] The above data is only an example based on the power supply circuit of this application. The power supply circuit of this application may also have two or more power output terminals 102 simultaneously outputting a second power supply to an external load. The output power of the power output terminal 102 of the power supply circuit of this application may also be other power, and this application does not make specific limitations on this.

[0164] Therefore, this application can support at least two power output terminals 102 to output a second power supply simultaneously under a single power supply, without affecting each other. When charging a single port, the current can be evenly distributed, which can perfectly replace the circuit structure that previously required DC-DC and protocol.

[0165] In addition, the power supply circuit with the above-described structure in this application has the following advantages:

[0166] (1) The power conversion efficiency of this application is equivalent to that of a power supply circuit composed of at least two AC / DC circuits. Compared with a power supply circuit using at least one AC / DC circuit plus at least two DC / DC circuits, the power conversion efficiency of this application is higher. Therefore, the power supply circuit with the above structure in this application improves the power conversion efficiency.

[0167] (2) Compared with a power supply circuit that uses at least one AC / DC circuit plus at least two DC / DC circuits, the power supply circuit of this application may not contain at least two DC / DC circuits, and the structure of the power supply circuit of this application is smaller, thereby facilitating the miniaturization of the device used to load the power supply circuit of this application.

[0168] (3) Compared with a power supply circuit that uses at least one AC / DC circuit plus at least two DC / DC circuits, since the power supply circuit of this application may not contain at least two DC / DC circuits, this application can reduce the manufacturing cost of the power supply circuit.

[0169] (4) The power supply circuit of this application includes a circuit structure that employs at least two flyback converter units 201 and at least two power output terminals 102, which can disperse the concentrated power heat generated by the input to the above-mentioned at least two subsequent circuits, so as to evenly distribute the heat in the power supply circuit, making the outer surface temperature of the device used to load the power supply circuit of this application uniform, and optimizing the heat dissipation cost of the device.

[0170] (5) Since the operating frequency of DC / DC circuits can only be controlled within the range of 300 kHz to 500 kHz, the size of DC / DC circuits can be reduced. However, when the operating frequency of DC / DC circuits is between 300 kHz and 500 kHz, the radiation generated is also relatively large. Therefore, additional manufacturing costs are required to solve the radiation problem. Since the power supply circuit of this application may not contain at least two DC / DC circuits, the power supply circuit of this application is equivalent to at least two AC / DC circuits. The radiation generated by at least two AC / DC circuits is much smaller than that of at least two DC / DC circuits. Therefore, this application can reduce the cost of solving the radiation problem.

[0171] (6) The power supply circuit of this application supports a wider range of output power, which can solve the problem of poor user experience caused by limited output power.

[0172] In another embodiment of this application, an electronic device is provided. This electronic device includes a power supply circuit as described in any of the above embodiments. For detailed explanations, please refer to the foregoing embodiments; further elaboration is not required here. In this embodiment, the electronic device may be a power adapter, a power bank, a docking station, or other devices capable of transmitting electrical energy or data. This embodiment does not specifically limit its functionality.

[0173] The power supply circuit and electronic device provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A power supply circuit, characterized in that, include: The power input terminal is used to provide a first power supply to the power circuit. At least two power output terminals are provided for supplying a second power supply to an external load connected to the power supply circuit; At least two flyback converter units are coupled to the power input terminal and to at least two power output terminals respectively, for converting the first power supply into the second power supply; A flyback control unit is coupled to at least two of the flyback converter units. The flyback control unit is used to control at least two of the flyback converter units to be connected in parallel when the second power supply is output at one of the power output terminals of the at least two power output terminals. The flyback converter unit includes: A transformer section is coupled between the power input terminal and the power output terminal and is used to perform voltage transformation on the first power supply. A synchronous rectification and filtering unit is coupled between the transformer unit and the power output terminal, and is used to rectify and filter the first power supply after voltage transformation; The first control unit is coupled to the transformer unit and the synchronous rectification and filtering unit respectively, and is used to control the working state of the transformer unit and the synchronous rectification and filtering unit; The flyback control unit includes: A switching unit, coupled between the two flyback converter units, is used to control the connection or disconnection of the two flyback converter units; The second control unit communicates bidirectionally with the first control unit and is coupled to the switch unit. The second control unit is used to receive the communication signal sent by the first control unit when it detects the sampling current, and to control the switch unit to turn on or off according to the communication signal.

2. The power supply circuit as described in claim 1, characterized in that, The flyback converter unit further includes: The power supply unit is coupled between the transformer unit and the first control unit and is used to convert the first power supply after voltage transformation into a third power supply, which is used to supply power to the first control unit.

3. The power supply circuit as described in claim 1, characterized in that, The flyback converter unit further includes: The sampling unit, coupled to the first control unit and the power output terminal, is used to generate a sampling current when an external load is connected to the power output terminal.

4. The power supply circuit as described in claim 1, characterized in that, The switching unit includes a bidirectional switch, which includes two back-to-back switching transistors.

5. The power supply circuit as described in claim 1, characterized in that, The power supply circuit also includes: at least two output switching units; Each of the output switching units is coupled between a flyback converter unit and the power output terminal corresponding to the flyback converter unit, and is used to control the connection or disconnection of the flyback converter unit and the power output terminal corresponding to the flyback converter unit.

6. An electronic device, characterized in that, The electronic device includes a power supply circuit as described in any one of claims 1 to 5.

Images