A small volume multi-port charging circuit and switching power supply

Abstract

The utility model provides a kind of multi-port charging circuit and switching power supply of small size, it is related to charging technical field, including: electromagnetic interference module, rectifier filter module, pulse width modulation control module, chip power module, synchronous rectification module, boost-buck conversion module, chip protocol module and transformer, electromagnetic interference module, rectifier filter module, pulse width modulation control module and chip power module are set in the primary side of transformer, synchronous rectification module, boost-buck conversion module, chip protocol module are set in the secondary side of transformer, pulse width modulation control module is electrically connected with the primary side of transformer by rectifier filter module, and synchronous rectification module is electrically connected with the secondary side of transformer.The utility model provides a kind of overall circuit occupies small, portable and charging power meets the requirement of equipment and can carry out the circuit of multi-port charging and the switching power supply of matched.

Description

Technical Field

[0001] This utility model relates to the field of charging technology, and in particular to a small-sized multi-port charging circuit and a switching power supply. Background Technology

[0002] Currently, most electronic devices use switching power supplies to save energy and improve efficiency. With the increasing popularity and application of portable electronic devices, in order to meet the charging requirements of these devices, chargers are usually equipped with multiple charging ports to facilitate simultaneous charging of multiple devices. Consequently, charging equipment such as chargers also need to be as portable as possible.

[0003] However, portable charging devices are prone to problems such as unstable internal charging circuits and low reliability due to their size. Therefore, it is necessary to improve the current charging circuits. Utility Model Content

[0004] In view of this, this utility model proposes a small-volume multi-port charging circuit and a switching power supply to solve the problem that current portable charging devices are prone to unstable internal charging circuits and low reliability due to size issues.

[0005] The technical solution of this utility model is implemented as follows:

[0006] According to a first aspect, this utility model provides a compact multi-port charging circuit, the circuit comprising:

[0007] Electromagnetic interference module, rectifier and filter module, pulse width modulation control module, chip power supply module, synchronous rectification module, buck-boost converter module, chip protocol module, and transformer T1;

[0008] The electromagnetic interference module, rectifier and filter module, pulse width modulation (PWM) control module, and chip power supply module are located on the primary side of transformer T1. The synchronous rectification module, buck-boost converter module, and chip protocol module are located on the secondary side of transformer T1. The input voltage is electrically connected to the PWM control module. The PWM control module is electrically connected to the primary side of transformer T1 through the rectifier and filter module. The synchronous rectification module is electrically connected to the secondary side of transformer T1 and is connected to at least one charging interface through the buck-boost converter module and the chip protocol module. The charging interface is responsible for providing the output voltage to the load. The PWM control module is electrically connected to the rectifier and filter module and the primary side of transformer T1. The PWM control module is equipped with an isolation device, and the PWM control module samples and provides feedback from the output voltage through the isolation device.

[0009] In conjunction with the first aspect, in the first embodiment of the first aspect, the electromagnetic interference module in the circuit includes:

[0010] Resistors RX1, RX2, RX3, RX4, capacitor CX1, and common-mode inductor LF1;

[0011] The first and second terminals of common-mode inductor LF1 are electrically connected between the live wire and the neutral wire. The first terminal of common-mode inductor L1 is electrically connected to the neutral wire, the second terminal of common-mode inductor L1 is electrically connected to the live wire, and the third terminal of common-mode inductor L1 is electrically connected to the live wire. The third and fourth terminals of common-mode inductor LF1 are both electrically connected to the rectifier filter module 200. Resistors RX1 and RX2 are connected in series between the third and fourth terminals of common-mode inductor LF1. One end of resistor RX1 is electrically connected to the fourth terminal of common-mode inductor LF1, and the other end of resistor RX1 is electrically connected to one end of resistor RX2. The other end of resistor RX2 is electrically connected to the third end of common mode inductor LF1. Resistors RX3 and RX4 are connected in series and connected between the third and fourth ends of common mode inductor LF1. One end of resistor RX3 is electrically connected to the fourth end of common mode inductor LF1. The other end of resistor RX3 is electrically connected to one end of resistor RX4. The other end of resistor RX4 is electrically connected to the third end of common mode inductor LF1. Resistors RX1 and RX2 are electrically connected to resistors RX3 and RX4. Capacitor CX1 is connected between the third and fourth ends of common mode inductor LF1.

[0012] In conjunction with the first embodiment of the first aspect, in the second embodiment of the first aspect, a fuse F1 is provided before the front end of the electromagnetic interference module;

[0013] Fuse F1 is located on the live wire. One end of fuse F1 is electrically connected to the live wire, and the other end of fuse F1 is electrically connected to the second end of common mode inductor L1.

[0014] In conjunction with the first embodiment of the first aspect, in the third embodiment of the first aspect, the pulse width modulation control module in the circuit includes:

[0015] The main control chip U4, diode D2, resistors R9, R27, R30, R47, R48, capacitors C11, C12, C15, C27, C35, thermistor NTC2, and the receiver of optocoupler U2A.

[0016] The first pin of the main control chip U4 is grounded through the thermistor NTC2. The second pin of the main control chip U4 is grounded through resistor R47. The third pin of the main control chip U4 is grounded through the receiver of the optocoupler U2A connected in series and capacitor C11. The fourth pin of the main control chip U4 is grounded through resistor R27 and capacitor C15 connected in series. The fourth pin of the main control chip U4 is electrically connected to the fourth terminal of the primary side of transformer T1 through series resistor R9. The fifth pin of the main control chip U4 is electrically connected to the fifth pin of the auxiliary control chip located on the primary side of transformer T1 through series resistor R30. The fifth pin of the main control chip U4 is grounded through series capacitor C12. The sixth pin of the main control chip U4 is grounded. The sixth pin of chip U4 is electrically connected to the second pin of the auxiliary control chip through a series capacitor C35. The seventh pin of the main control chip U4 is electrically connected to the third pin of the auxiliary control chip. The eighth pin of the main control chip U4 is electrically connected to the chip power supply module 400 and the second pin of the auxiliary control chip. The tenth pin of the main control chip U4 is electrically connected to the B+ terminal through a series resistor R48 and a diode D2. One end of resistor R48 is electrically connected to the tenth pin of the main control chip U4, and the other end of resistor R48 is electrically connected to the negative terminal of diode D2. The positive terminal of diode D2 is grounded. The end of resistor R48 furthest from the tenth pin of the main control chip U4 is electrically connected to capacitor C27, and the other end of capacitor C27 is grounded.

[0017] In conjunction with the third embodiment of the first aspect, in the fourth embodiment of the first aspect, the rectifier and filter module in the circuit includes:

[0018] Diodes D3, D4, D5, and D6; polarized capacitors EC1 and EC2; capacitors C18, C18A, C40, C44, and C47; and differential mode inductor L1.

[0019] The anode of diode D3 is electrically connected to the third terminal of common-mode inductor LF1, and the cathode of diode D3 is electrically connected to the second terminal of differential-mode inductor L1. The anode of diode D4 is electrically connected to the fourth terminal of common-mode inductor LF1, and the cathode of diode D4 is electrically connected to the first terminal of differential-mode inductor L1. The cathodes of diodes D3 and D4 are interconnected. The cathode of diode D5 is electrically connected to the fourth terminal of common-mode inductor LF1, and the cathode of diode D6 is electrically connected to the third terminal of common-mode inductor LF1. The anodes of diodes D5 and D6 are connected in series with polarized capacitors EC1 and C. 18. Capacitor C18A is electrically connected to the first terminal of differential mode inductor L1. The positive terminal of polarized capacitor EC1 is electrically connected to the first terminal of differential mode inductor L1. The negative terminal of polarized capacitor EC1 is electrically connected to the positive terminals of diodes D5 and D6. The positive terminals of diodes D5 and D6 are electrically connected to the two terminals of differential mode inductor L1 through polarized capacitors EC2, C40, and C44, which are connected in series. The positive terminal of polarized capacitor EC2 is electrically connected to the first terminal of differential mode inductor L1. The negative terminal of polarized capacitor EC2 is electrically connected to the positive terminals of diodes D5 and D6.

[0020] In conjunction with the fourth embodiment of the first aspect, in the fifth embodiment of the first aspect, the synchronous rectification module in the circuit includes:

[0021] Rectifier chip U5, resistors R49, R50, R51, capacitors C20A, C36, C37, C38, C39, MOSFET Q5, polarized capacitor EC4, and polarized capacitor EC5.

[0022] The seventh and eighth terminals of the secondary side of transformer T1 are electrically connected to the VIN terminal. The fifth and sixth terminals of the secondary side of transformer T1 are electrically connected to the drain of MOSFET Q5. The source of MOSFET Q5 is electrically connected to the VIN terminal through capacitors C37, C39, EC4, and EC5 connected in parallel. The positive terminals of EC4 and EC5 are electrically connected to the VIN terminal, and the negative terminals of EC4 and EC5 are electrically connected to the source of MOSFET Q5 and grounded. The gate of MOSFET Q5 is electrically connected to the fifth pin of rectifier chip U5. The drain and source of MOSFET Q5 are electrically connected through resistor R51 and capacitor C20A connected in series. One end of resistor R51 is electrically connected to the gate of MOSFET Q5, and the other end of resistor R51 is electrically connected to one end of capacitor C20A. The other end of capacitor C20A is electrically connected to the source of MOSFET Q5. The fifth and sixth terminals of the secondary side of transformer T1 are electrically connected to the sixth pin of rectifier chip U5 through series resistor R50. The fourth pin of rectifier chip U5 is electrically connected to the source of MOSFET Q5 through series capacitor C36. The first pin of rectifier chip U5 is electrically connected to the source of MOSFET Q5 through series capacitor C38. The second pin of rectifier chip U5 is electrically connected to the source of MOSFET Q5. The third pin of rectifier chip U5 is electrically connected to the source of MOSFET Q5 through series resistor R49.

[0023] In conjunction with the fifth embodiment of the first aspect, in the sixth embodiment of the first aspect, the chip protocol module in the circuit includes:

[0024] Resistors R2, R3, R15, R18, R33, capacitors C1, C2, C6, C7, C8, C9, C19, C23, C24, the light source of optocoupler U2A, MOSFET Q2, MOSFET Q4, and the protocol control chip;

[0025] The VIN terminal is electrically connected to the light source of optocoupler U2A via resistor R2 and to resistor R3 via capacitor C1. The branch formed by resistor R2 and the light source of optocoupler U2A is connected in series with the branch formed by capacitor C1 and resistor R3. Resistor R2 and the light source of optocoupler U2A are electrically connected. One end of the light source of optocoupler U2A is electrically connected to resistor R2. The other end of the light source of optocoupler U2A is electrically connected to the second pin (VFB1) of the protocol control chip via capacitor C23 and resistor R15 (connected in series). The other end of the light source of optocoupler U2A is electrically connected to the third pin of the protocol control chip via capacitor C24 and resistor R18 (connected in series). The first pin (VCC) of the protocol control chip is grounded via capacitor C19 (connected in series). Capacitor C19 is located away from the protocol control chip. One end of the protocol control chip is electrically connected to the VIN terminal via capacitors C6 and C7 connected in parallel. The VIN terminal is electrically connected to the drain of MOSFET Q2. The source of MOSFET Q2 is electrically connected to the source of MOSFET Q4. The gates of both MOSFET Q2 and Q4 are electrically connected to pin 31 of the protocol control chip. The gates of MOSFET Q2 and Q4, and the source of MOSFET Q2 and Q4 are electrically connected via resistor R33. The drain of MOSFET Q4 is electrically connected to pins 38 and 39 of the protocol control chip. Pin 38 of the protocol control chip is electrically connected to capacitors C6 and C7 via capacitors C8 and C9 connected in parallel. The protocol control chip is electrically connected to at least one charging interface via the first peripheral circuit.

[0026] In conjunction with the sixth embodiment of the first aspect, in the seventh embodiment of the first aspect, the buck-boost converter module 600 in the circuit includes:

[0027] Resistors R7, R10, R32, R37, R39; capacitors C01, C02, C03, C04, C13, C31, C30, C31A, C32, C33, C34, C41, C42, C45, C45A, C51, C52; polarized capacitor EC3; polarized capacitor EC6; differential mode inductor L2; and buck-boost control chip U1.

[0028] The second pin of the buck-boost control chip U1 is electrically connected to the VIN terminal. The second pin of the buck-boost control chip U1 is grounded through capacitors C02, C03, C04, C15, C31, and C31A connected in parallel, as well as polarized capacitor EC6. The positive terminal of polarized capacitor EC6 is grounded, and the negative terminal of polarized capacitor EC6 is electrically connected to the second pin of the buck-boost control chip U1. The twelfth and thirteenth pins of the buck-boost control chip U1 are electrically connected through a differential mode inductor L2. One end of the differential mode inductor L2 is electrically connected to the eleventh pin of the buck-boost control chip U1 through capacitor C32, and the other end of the differential mode inductor L2 is electrically connected to the fourteenth pin of the buck-boost control chip U1 through capacitor C30. The fourth pin of the buck-boost control chip U1 is grounded through capacitors C33, C45, and C45A connected in parallel. The fourth pin of the buck-boost control chip U1 is connected in series with resistor R3. 7. Capacitor C13 and resistor R10 are electrically connected to pin 17 of buck-boost control chip U1. Resistor R7 is connected in series with capacitor C13. Resistor R37 and capacitor C13 are grounded through parallel polarized capacitors EC3 and C25. The negative terminal of polarized capacitor EC3 is grounded, and the positive terminal of polarized capacitor EC3 is electrically connected to resistor R37. Pins 5 and 6 of buck-boost control chip U1 are connected to the two ends of resistor R37 and electrically connected through capacitor C01. Pin 18 of buck-boost control chip U1 is grounded through capacitor C42. Pin 15 of buck-boost control chip U1 is grounded through capacitor C41. Pin 7 of buck-boost control chip U1 is grounded through capacitor C34. The end of resistor R10 away from pin 17 of buck-boost control chip U1 is grounded through resistor R32. Resistor R7 is electrically connected to resistor R32. The end of resistor R7 away from resistor R32 is electrically connected to the drain of MOSFET Q4.

[0029] In conjunction with the third embodiment of the first aspect, in the eighth embodiment of the first aspect, the chip power supply module in the circuit includes:

[0030] Resistor R29, resistor R31, polarized capacitor C14, capacitor C29, diode D8, and power supply control chip U6;

[0031] The first pin of the power supply control chip U6 is electrically connected to the eighth pin of the main control chip U4 through a series resistor R31. The first pin of the power supply control chip U6 is grounded through a series capacitor C16. The second pin of the power supply control chip U6 is grounded. The third pin of the power supply control chip U6 is electrically connected to the fourth terminal of the primary side of the transformer T1 through a series diode D8 and a resistor R29. The cathode of the diode D8 is electrically connected to the third pin of the power supply control chip U6, and the anode of the diode D8 is electrically connected to the resistor R29. The other end of the resistor R29 is electrically connected to the fourth terminal of the primary side of the transformer T1. The third pin of the power supply control chip U6 is grounded through a parallel polarized capacitor C14 and a capacitor C29. The anode of the polarized capacitor C14 is electrically connected to the third pin of the power supply control chip U6, and the cathode of the polarized capacitor C14 is grounded.

[0032] According to a second aspect, the present invention also provides a switching power supply, the switching power supply comprising: a small-volume multi-port charging circuit according to any one of the preceding claims.

[0033] The small-sized multi-port charging circuit and switching power supply of this invention have the following advantages over the prior art:

[0034] This invention provides a flyback switching power supply by incorporating an electromagnetic interference module, a rectification and filtering module, a pulse width modulation (PWM) control module, a chip power supply module, a synchronous rectification module, a buck-boost conversion module, a chip protocol module, and a transformer. The PWM control module regulates the input voltage to store energy at the transformer's edge. Under the control of the PWM control module, the previously stored back electromotive force is released to the load via the transformer's primary side, thus charging the load. This flyback switching power supply can achieve multiple outputs, simultaneously charging multiple electronic devices within the load. Due to the inclusion of the chip protocol module, a preset charging protocol within the module controls at least one charging port to charge various devices within the load, enabling the charging circuit to meet the needs of various types of devices. In the charging scenario, an electromagnetic interference (EMI) module effectively suppresses electromagnetic interference (EMI) in the circuit, while simultaneously improving the circuit's anti-EMI capability. The generated EMI is optimized to ensure the circuit complies with relevant EMI standards. The rectifier-filter module, synchronous rectification module, and buck-boost conversion module respectively rectify, filter, synchronously rectify, and convert the input voltage to the target output voltage. An isolation device samples and feeds back the output voltage, then outputs a feedback signal to the pulse width modulation (PWM) control module. This process achieves isolated feedback; when the output voltage exceeds a preset value, the isolation device feeds back to the PWM control module, which then generates a corresponding protection signal. Therefore, this invention can simultaneously charge multiple electronic devices while maintaining a small overall circuit size, portability, and sufficient charging power to meet device requirements. It supports a wider range of charging scenarios and enables fast and efficient charging. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of the small-volume multi-port charging circuit of this utility model;

[0037] Figure 2 This is a circuit diagram of the electromagnetic interference module, rectifier and filter module, pulse width modulation control module, chip power supply module and synchronous rectification module in the small-volume multi-port charging circuit of this utility model.

[0038] Figure 3This is a circuit diagram of the chip protocol module in the small-volume multi-port charging circuit of this utility model.

[0039] Figure 4 This is a circuit diagram of the buck-boost conversion module in the small-volume multi-port charging circuit of this utility model. Detailed Implementation

[0040] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0041] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] Currently, most electronic devices use switching power supplies to save energy and improve efficiency. With the increasing popularity and application of portable electronic devices, chargers for these devices are typically equipped with multiple charging ports to meet the charging requirements of these devices simultaneously.

[0044] For safety reasons and to prevent equipment failure, there is a need for a switching power supply with a more stable charging voltage and the ability to charge multiple ports.

[0045] The compact multi-port charging circuit and switching power supply provided in this manual aim to offer a circuit that occupies a small overall size, is easy to carry, and provides sufficient charging power to meet device requirements while enabling multi-port charging, along with a matching switching power supply.

[0046] Please see Figures 1 to 4 , Figure 1A schematic diagram of the structure of a small-volume multi-port charging circuit according to an embodiment of the present invention is shown. Figure 2 This is a circuit diagram of the electromagnetic interference module, rectification and filtering module, pulse width modulation control module, chip power supply module, and synchronous rectification module in the small-volume multi-port charging circuit of this utility model. Figure 3 This is a circuit diagram of the chip protocol module in the small-volume multi-port charging circuit of this utility model. Figure 4 This is a circuit diagram of the buck-boost conversion module in the small-volume multi-port charging circuit of this utility model.

[0047] The circuit specifically includes:

[0048] The system includes an Electromagnetic Interference (EMI) module 100, a rectifier and filter module 200, a Pulse Width Modulation (PWM) control module 300, a chip power supply module 400, a synchronous rectification module 500, a buck-boost converter module 600, a chip protocol module 700, and a transformer T1. The EMI module 100, rectifier and filter module 200, PWM control module 300, and chip power supply module 400 are located on the primary side of transformer T1, while the synchronous rectification module 500, buck-boost converter module 600, and chip protocol module 700 are located on the secondary side of transformer T1. The input voltage is electrically connected to the EMI module 100. The rectifier and filter module 200 is electrically connected to the primary side of the transformer T1. The synchronous rectifier module 300 is electrically connected to the secondary side of the transformer T1. The synchronous rectifier module 300 is connected to at least one charging interface through the buck-boost converter module 600 and the chip protocol module 700. The charging interface is responsible for providing output voltage to the load. The PWM control module 300 is electrically connected to the rectifier and filter module 200 and the primary side of the transformer T1. The PWM control module 300 is equipped with an isolation device. The PWM control module 300 samples and provides feedback from the output voltage through the isolation device.

[0049] In this embodiment, the input voltage is AC mains voltage. After the input voltage is connected to the circuit, it will first enter the EMI module, i.e., the EMI circuit.

[0050] More specifically, the EMI module 100 in this circuit includes:

[0051] Resistors RX1, RX2, RX3, and RX4, capacitor CX1, and common-mode inductor LF1 constitute the EMI module 100, i.e., the EMI circuit. The common-mode inductor LF1 has four pins. The first and second pins of LF1 are electrically connected between the live wire (L line) and the neutral wire (N line). The first pin of LF1 is electrically connected to the neutral wire, the second pin is electrically connected to the live wire, and the third pin is electrically connected to the live wire. The third and fourth pins of LF1 are both electrically connected to the rectifier and filter module 200. Resistors RX1 and RX2 are connected in series between the third and fourth pins of LF1. One end of resistor RX1 is electrically connected to the fourth terminal of common-mode inductor LF1. The other end of resistor RX1 is electrically connected to one end of resistor RX2. The other end of resistor RX2 is electrically connected to the third terminal of common-mode inductor LF1. Resistors RX3 and RX4 are connected in series and connected between the third and fourth terminals of common-mode inductor LF1. One end of resistor RX3 is electrically connected to the fourth terminal of common-mode inductor LF1. The other end of resistor RX3 is electrically connected to one end of resistor RX4. The other end of resistor RX4 is electrically connected to the third terminal of common-mode inductor LF1. Resistors RX1 and RX2 are electrically connected to resistors RX3 and RX4. Capacitor CX1 is connected between the third and fourth terminals of common-mode inductor LF1.

[0052] Resistors RX1, RX2, RX3, and RX4 (all X resistors) will perform filtering and discharge. Using multiple resistors can effectively distribute the power carried by each resistor, protect the resistors, and improve the filtering and discharge effect. Capacitor CX1 is a differential mode capacitor (X capacitor), which plays a role in filtering differential mode interference. Common mode inductor LF1 can attenuate common mode current.

[0053] The EMI module 100 can effectively suppress electromagnetic interference in the circuit, while improving the circuit's own anti-electromagnetic interference capability, optimizing the generated electromagnetic interference, and making the circuit comply with the corresponding electromagnetic interference standards.

[0054] In this embodiment, a fuse F1 is provided at the front end of the EMI module 100, i.e., before the EMI module 100 is connected to the input voltage. The fuse F1 is located on the live wire, with one end of the fuse F1 electrically connected to the live wire and the other end of the fuse F1 electrically connected to the second terminal of the common-mode inductor L1. When the current flowing through the switching power supply is too large, the fuse F1 will open, protecting the circuit.

[0055] More specifically, the PWM control module 300 in this circuit includes:

[0056] The main control chip U4, diode D2, resistors R9, R27, R30, R47, R48, capacitors C11, C12, C15, C27, C35, thermistor NTC2, and the receiver of optocoupler U2A constitute the PWM control module 200, i.e., the PWM circuit. The main control chip U4 has 10 pins. The first pin (OTP pin) is grounded via a thermistor NTC. The second pin (SW / NC pin) is grounded via resistor R47. The third pin is grounded via the receiver of optocoupler U2A (connected in series) and capacitor C11. The fourth pin (ZCD pin) is grounded via resistor R27 and capacitor C15 (connected in series). The fourth pin is electrically connected to the fourth terminal (T1B) of the primary side of transformer T1 via resistor R9. The fifth pin is electrically connected to the fifth pin (CS pin) of the auxiliary control chip located on the primary side of transformer T1 via resistor R30. The fifth pin is grounded via capacitor C12. The sixth pin, GND, is grounded. The sixth pin of the main control chip U4 is electrically connected to the second pin, VCC, of ​​the auxiliary control chip through a series capacitor C35. The seventh pin, DRV, of the main control chip U4 is electrically connected to the third pin, PWM, of the auxiliary control chip. The eighth pin of the main control chip U4 is electrically connected to the chip power supply module 400 and the second pin of the auxiliary control chip. The tenth pin, HV, of the main control chip U4 is electrically connected to the B+ terminal through a series resistor R48 and a diode D2. One end of the resistor R48 is electrically connected to the tenth pin of the main control chip U4, and the other end of the resistor R48 is electrically connected to the negative terminal of the diode D2. The positive terminal of the diode D2 is grounded. The end of the resistor R48 furthest from the tenth pin of the main control chip U4 is electrically connected to a capacitor C27, and the other end of the capacitor C27 is grounded.

[0057] The auxiliary control chip has five pins. The first pin of the auxiliary control chip, namely the DRAIN pin, is electrically connected to the second end of the primary side of the transformer T1. The second pin of the auxiliary control chip is also grounded through capacitor C43. One end of capacitor C43 is electrically connected to the second pin of the auxiliary control chip, and the other end of capacitor C43 is grounded. The grounded end of capacitor C43 is electrically connected to the first pin of the auxiliary control chip through capacitor C53. The fifth pin of the auxiliary control chip, namely GND, is grounded.

[0058] The PWM control module 300 and the auxiliary control chip are the main and core parts of this circuit. After the EMI module 100 obtains the input voltage, it feeds the input voltage, which is the mains power, back to the PWM control module 300 at the input end for processing. The PWM control module 300 is responsible for regulating the output power to achieve a dynamic balance.

[0059] Pin 8 of the main control chip U4 is powered by the chip power supply module 400, and pin 10 is connected to the rectified high-voltage DC power for chip startup and internal high-voltage circuitry. The conduction of the MOSFET inside the PWM control module 300 is controlled by detecting the voltage at the corresponding pin. When the MOSFET inside the PWM control module 300 is on and forms a circuit, the primary winding terminal of transformer T1 is negative, and the secondary winding terminal is also negative. The buck-boost converter module 600 and the chip protocol module 700 connected to the secondary side of transformer T1 are not working, and transformer T1 stores energy. When the MOSFET inside the main control chip U4 is off, the primary winding of transformer T1 has a back electromotive force that needs to be released. At this time, the primary winding terminal of transformer T1 is positive, and the secondary winding terminal is also positive. The buck-boost converter module 600 and the chip protocol module 700 connected to the secondary side of transformer T1 process the input voltage accordingly. It can be seen that this circuit uses a flyback power supply.

[0060] The receiver of optocoupler U2B and the light source of optocoupler U2A (described later) together constitute a complete optocoupler. The optocoupler can sample and provide feedback on the output voltage. When the light source of optocoupler U2B is energized and turned on, it can further turn on the receiver, thereby outputting a feedback signal to the main control chip U4. Since the receiver of optocoupler U2B is an isolation device, this process achieves isolated feedback. When the output voltage is detected to exceed the preset value, it is fed back to the main control chip U4 through the receiver of optocoupler U2B. The main control chip U4 will generate a corresponding signal for protection.

[0061] Preferably, the main control chip U4 uses the SC3023D model chip.

[0062] Accordingly, the chip power supply module 400 in this circuit includes:

[0063] Resistors R29 and R31, polarized capacitors C14 and C29, diode D8, and power supply control chip U6 constitute the chip power supply module 400, i.e., the chip power supply circuit. The first pin (VDD) of the power supply control chip U6 is electrically connected to the eighth pin of the main control chip U4 via series resistor R31. The first pin of the power supply control chip U6 is grounded via series capacitor C16. The second pin (GND) of the power supply control chip U6 is grounded, and the third pin (VCC) of the power supply control chip U6... The pin is electrically connected to the fourth terminal of the primary side of transformer T1 via diode D8 and resistor R29, which are connected in series. The cathode of diode D8 is electrically connected to the third pin of power supply control chip U6, and the anode of diode D8 is electrically connected to resistor R29. The other end of resistor R29 is electrically connected to the fourth terminal of the primary side of transformer T1. The third pin of power supply control chip U6 is grounded via polarized capacitor C14 and capacitor C29, which are connected in parallel. The anode of polarized capacitor C14 is electrically connected to the third pin of power supply control chip U6, and the cathode of polarized capacitor C14 is grounded.

[0064] The chip power supply module 400 supplies power to the idle chip U6 and its peripheral circuits, and is responsible for power conversion and distribution network for the PWM control module 300, especially the main control chip U4.

[0065] Preferably, the power supply control chip U6 is an LN3220 chip, which is the core of the entire chip power supply module 400. It is responsible for monitoring, regulating and managing the operation of the chip power supply module 400.

[0066] More specifically, the rectifier and filter module 200 in this circuit includes:

[0067] Diodes D3, D4, D5, and D6, polarized capacitors EC1 and EC2, capacitors C18, C18A, C40, C44, and C47, and differential-mode inductor L1 constitute the rectifier-filter module 200, i.e., the rectifier-filter circuit. Specifically, the anode of diode D3 is electrically connected to the third terminal of common-mode inductor LF1, and the cathode of diode D3 is electrically connected to the second terminal of differential-mode inductor L1. The anode of diode D4 is electrically connected to the fourth terminal of common-mode inductor LF1, and the cathode of diode D4 is electrically connected to the first terminal of differential-mode inductor L1. The cathodes of diodes D3 and D4 are interconnected. The cathode of diode D5 is electrically connected to the fourth terminal of common-mode inductor LF1. The cathode of diode D6... The anode is electrically connected to the third terminal of the common-mode inductor LF1. The anodes of diodes D5 and D6 are electrically connected to the first terminal of the differential-mode inductor L1 through parallel polarized capacitors EC1, C18, and C18A. The anode of polarized capacitor EC1 is electrically connected to the first terminal of the differential-mode inductor L1. The cathode of polarized capacitor EC1 is electrically connected to the anodes of diodes D5 and D6. The anodes of diodes D5 and D6 are electrically connected to the second terminal of the differential-mode inductor L1 through parallel polarized capacitors EC2, C40, and C44. The anode of polarized capacitor EC2 is electrically connected to the third terminal of the differential-mode inductor L1. The cathode of polarized capacitor EC2 is electrically connected to the anodes of diodes D5 and D6.

[0068] It is understandable that the rectifier and filter module 200 is the rectifier circuit on the primary side of the transformer T1. The diodes D3 to D6 in the rectifier and filter module form a rectifier bridge structure to rectify the input voltage received by the EMI module 100 on the primary side. The low-frequency pulsation is leveled by charging and discharging the polarized capacitors EC1 and EC2. The differential mode inductor L1 is responsible for finely filtering out high-frequency noise.

[0069] In this embodiment, an absorption circuit is also provided on the primary side of transformer T1. More specifically, the absorption circuit consists of capacitor C10, resistor RX5, resistor R8, resistor R8A, and diode D1. The second terminal of the primary side of transformer T1 is electrically connected to the positive terminal of diode D1. The negative terminal of diode D1 is electrically connected to the first terminal of the primary side of transformer T1 through resistor R18 and resistor RX5 connected in series. The negative terminal of diode D1 is also electrically connected to the first terminal of the primary side of transformer T1 through resistor R18A and capacitor C10 connected in series. Furthermore, resistors R18 and RX5 are electrically connected to resistor R18A and capacitor C10.

[0070] Since transformer T1 also has winding coils and generated magnetism, when the primary winding circuit of transformer T1 is disconnected, there is a back electromotive force in the primary winding that needs to be released. Therefore, at this time, the same-name terminal of the primary winding is the positive terminal. At this time, the current flows through diode D1 to charge capacitor C10. Capacitor C10 then discharges through other resistors in the absorption circuit. In this way, the discharge voltage can be controlled within the preset range by using the absorption circuit.

[0071] More specifically, the synchronous rectification module 500 in this circuit includes:

[0072] The rectifier chip U5, resistors R49, R50, and R51, capacitors C20A, C36, C37, C38, and C39, MOSFET Q5, polarized capacitor EC4, and polarized capacitor EC5 constitute the synchronous rectification module 500, also known as the synchronous rectification circuit. The rectifier chip U5 has six pins. The seventh and eighth terminals of the secondary side of transformer T1 are connected to the input pin VIN of the chip protocol module 700. The transformer T1's secondary side is electrically connected to the drain of MOSFET Q5 via terminals 5 and 6. The source of MOSFET Q5 is electrically connected to the VIN terminal via capacitors C37, C39, EC4, and EC5 connected in parallel. The positive terminals of EC4 and EC5 are electrically connected to the VIN terminal, and the negative terminals of EC4 and EC5 are electrically connected to the source of MOSFET Q5 and grounded. The gate of MOSFET Q5 is connected to the mains. The fifth pin of rectifier chip U5, i.e., the DRV pin, is electrically connected. The drain and source of MOSFET Q5 are electrically connected through a series resistor R51 and a capacitor C20A. One end of resistor R51 is electrically connected to the gate of MOSFET Q5, and the other end of resistor R51 is electrically connected to one end of capacitor C20A. The other end of capacitor C20A is electrically connected to the source of MOSFET Q5. The fifth and sixth terminals of the secondary side of transformer T1 are electrically connected to the sixth pin of rectifier chip U5, i.e., the VSEN pin, through a series resistor R50. The fourth pin of rectifier chip U5, i.e., the VDD pin, is electrically connected to the source of MOSFET Q5 through a series capacitor C36. The first pin of rectifier chip U5 is electrically connected to the source of MOSFET Q5 through a series capacitor C38. The second pin of rectifier chip U5, i.e., the GND pin, is electrically connected to the source of MOSFET Q5. The third pin of rectifier chip U5, i.e., the RSET pin, is electrically connected to the source of MOSFET Q5 through a series resistor R49.

[0073] The synchronous rectification module 500 is the rectifier circuit on the secondary side of transformer T1, responsible for synchronously rectifying the input voltage before providing it to the buck-boost converter module 600 and the chip protocol module 700 for further processing. The rectifier chip U5 and its associated peripheral circuitry are responsible for performing the aforementioned synchronous rectification of the input voltage.

[0074] More specifically, the chip protocol module 700 in this circuit includes:

[0075] Resistors R2, R3, R15, R18, R33, capacitors C1, C2, C6, C7, C8, C9, C19, C23, C24, the light source of optocoupler U2A, MOSFETs Q2 and Q4, and the protocol control chip constitute the chip protocol module 700, i.e., the MCU protocol control circuit. The VIN terminal is electrically connected to the light source of optocoupler U2A through resistor R2 and electrically connected to resistor R3 through capacitor C1. The connection is as follows: the branch consisting of resistor R2 and the light source of optocoupler U2A is connected in series with the branch consisting of capacitor C1 and resistor R3. Resistor R2 and the light source of optocoupler U2A are electrically connected. One end of the light source of optocoupler U2A is electrically connected to resistor R2. The other end of the light source of optocoupler U2A is electrically connected to the second pin (VFB1) of the protocol control chip through capacitor C23 and resistor R15, which are connected in series. The other end of the light source of optocoupler U2A is connected to the protocol control chip through capacitor C24 and resistor R18, which are connected in series. The third pin of the control chip, i.e., IFB1, is electrically connected. The first pin of the protocol control chip, i.e., VCC, is grounded through a series capacitor C19. The end of capacitor C19 furthest from the protocol control chip is electrically connected to the VIN terminal through capacitors C6 and C7 connected in parallel. The VIN terminal is electrically connected to the drain of MOSFET Q2. The source of MOSFET Q2 is electrically connected to the source of MOSFET Q4. The gates of both MOSFET Q2 and MOSFET Q4 are electrically connected to the thirty-first pin of the protocol control chip, i.e., DRV4. The gates of MOSFETs Q2 and Q4 are electrically connected via resistor R33. The drain of MOSFET Q4 is electrically connected to pins 38 and 39 of the protocol control chip, namely pins VIN1 and VIN2. Pin 38 of the protocol control chip is electrically connected to capacitors C8 and C9, which are connected in parallel, along with capacitors C6 and C7. The protocol control chip is electrically connected to a first charging interface via a first peripheral circuit and also via a second peripheral circuit. For example, both the first and second charging interfaces can be configured as USB-C interfaces.

[0076] The protocol chip in the chip protocol module 700 controls at least one charging port to charge various devices in the load through a preset charging protocol, enabling the charging circuit to meet various charging scenarios. The preset charging protocol can be USB Power Delivery (PD) protocol, Quick Charge (QC) protocol, etc.

[0077] More specifically, the buck-boost converter module 600 in this circuit includes:

[0078] Resistors R7, R10, R32, R37, and R39; capacitors C01, C02, C03, C04, C13, C31, C30, C31A, C32, C33, C34, C41, C42, C45, C45A, C51, and C52; polarized capacitors EC3 and EC6; differential-mode inductor L2; and buck-boost control chip U1. These electronic components constitute the buck-boost converter module 600, or buck-boost converter circuit. The second pin, VIN, of the buck-boost control chip U1 is connected to V... The IN terminal is electrically connected. The second pin of the buck-boost control chip U1 is grounded through capacitors C02, C03, C04, C15, C31, C31A, and polarized capacitor EC6, which are connected in parallel. The positive terminal of polarized capacitor EC6 is grounded, and the negative terminal of polarized capacitor EC6 is electrically connected to the second pin of the buck-boost control chip U1. The twelfth pin (SW2) and the thirteenth pin (SW1) of the buck-boost control chip U1 are electrically connected through differential mode inductor L2. One end of differential mode inductor L2 is electrically connected to the eleventh pin (BST2) of the buck-boost control chip U1 through capacitor C32, and the other end of differential mode inductor L2 is connected to... The capacitor C30 is electrically connected to the fourteenth pin (BST1) of the buck-boost control chip U1. The fourth pin (OUT) of the buck-boost control chip U1 is grounded through capacitors C33, C45, and C45A connected in parallel. The fourth pin of the buck-boost control chip U1 is electrically connected to the seventeenth pin (FB) of the buck-boost control chip U1 through resistors R37, C13, and R10 connected in series. A resistor R7 is connected in series with capacitor C13. Resistor R37 and capacitor C13 are grounded through parallel polarized capacitors EC3 and C25. The negative terminal of polarized capacitor EC3 is grounded, and the positive terminal of polarized capacitor EC3 is connected to the ground. Resistor R37 is electrically connected. The fifth and sixth pins of the buck-boost control chip U1 are connected to the two ends of resistor R37 respectively and are electrically connected through capacitor C01. The eighteenth pin of buck-boost control chip U1, i.e., the V5V pin, is grounded through capacitor C42. The fifteenth pin of buck-boost control chip U1, i.e., the VCC pin, is grounded through capacitor C41. The seventh pin of buck-boost control chip U1, i.e., the IMON pin, is grounded through capacitor C34. The end of resistor R10 away from the seventeenth pin of buck-boost control chip U1 is grounded through resistor R32. Resistor R7 is electrically connected to resistor R32. The end of resistor R7 away from resistor R32 is electrically connected to the drain of MOSFET Q4.

[0079] Preferably, the eighth pin (ALT pin), tenth pin (SAL pin), ninth pin (SDA pin), and nineteenth pin (ADDR pin) of the buck-boost control chip U1 are electrically connected to the VCC_BUCK terminal through resistors R28, R24, R22, and R11, respectively, and the buck-boost control chip U1 is grounded through resistor R39.

[0080] When the input voltage range may be higher, lower, or equal to the required output voltage, the voltage is converted by a buck-boost converter module to maintain the stability of the output voltage.

[0081] This utility model embodiment also provides a switching power supply based on the above-described small-volume multi-port charging circuit. The working mode of the switching power supply is as described in the above-described small-volume multi-port charging circuit, and will not be repeated here.

[0082] This utility model provides a small-volume multi-port charging circuit and switching power supply. Through an electromagnetic interference module 100, a rectification and filtering module 200, a pulse width modulation (PWM) control module 300, a chip power supply module 400, a synchronous rectification module 500, a buck-boost converter module 600, a chip protocol module 700, and a transformer T1, it provides a flyback switching power supply. The PWM control module 500 controls the input voltage to store energy at the edge of the transformer T1. Under the control of the PWM control module 500, the previously stored back electromotive force is released to the load via the primary side of the transformer T1, providing energy to the load and charging it. This flyback switching power supply can achieve multi-output, simultaneously charging multiple electronic devices in the load. Because of the chip protocol module 700, at least one charging port is controlled to charge the load via a preset charging protocol. This charging circuit can charge various devices simultaneously, meeting diverse charging scenarios. Simultaneously, the electromagnetic interference module 100 effectively suppresses electromagnetic interference (EMI) and enhances the circuit's immunity to EMI. It optimizes the generated EMI to ensure compliance with relevant EMI standards. The rectifier-filter module 200, synchronous rectifier module 500, and buck-boost converter module 600 respectively rectify, filter, synchronously rectify, and convert the input voltage to the target output voltage. An isolation device samples and feeds back the output voltage, sending a feedback signal to the pulse width modulation (PWM) control module 500. This process achieves isolated feedback; when the output voltage exceeds a preset value, the isolation device feeds back to the PWM control module 500, which then generates a corresponding protection signal. Therefore, this invention can simultaneously charge multiple electronic devices while maintaining a small overall circuit size, portability, and sufficient charging power to meet device requirements. It supports a wider range of charging scenarios and enables fast and efficient charging.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A small volume multi-port charging circuit, characterized by: The circuit includes: Electromagnetic interference module 100, rectifier and filter module 200, pulse width modulation control module 300, chip power supply module 400, synchronous rectification module 500, buck-boost converter module 600, chip protocol module 700, and transformer T1; Electromagnetic interference module 100, rectifier and filter module 200, pulse width modulation control module 300, and chip power supply module 400 are located on the primary side of transformer T1. Synchronous rectification module 500, buck-boost converter module 600, and chip protocol module 700 are located on the secondary side of transformer T1. The input voltage is electrically connected to the pulse width modulation control module 300 (module 100). The pulse width modulation control module 300 is electrically connected to the primary side of transformer T1 through the rectifier and filter module 200. The synchronous rectification module 300 is electrically connected to the secondary side of transformer T1 and is connected to at least one charging interface through the buck-boost converter module 600 and the chip protocol module 700. The charging interface is responsible for providing output voltage to the load. The pulse width modulation control module 300 is electrically connected to the rectifier and filter module 200 and the primary side of transformer T1. The pulse width modulation control module 300 is equipped with an isolation device, and the pulse width modulation control module 300 samples and provides feedback from the output voltage through the isolation device.

2. The compact multi-port charging circuit as described in claim 1, characterized in that: The electromagnetic interference module 100 in the circuit includes: Resistors RX1, RX2, RX3, RX4, capacitor CX1, and common-mode inductor LF1; The first and second terminals of common-mode inductor LF1 are electrically connected between the live wire and the neutral wire. The first terminal of common-mode inductor L1 is electrically connected to the neutral wire, the second terminal of common-mode inductor L1 is electrically connected to the live wire, and the third terminal of common-mode inductor L1 is electrically connected to the live wire. The third and fourth terminals of common-mode inductor LF1 are both electrically connected to the rectifier filter module 200. Resistors RX1 and RX2 are connected in series between the third and fourth terminals of common-mode inductor LF1. One end of resistor RX1 is electrically connected to the fourth terminal of common-mode inductor LF1, and the other end of resistor RX1 is electrically connected to one end of resistor RX2. The other end of resistor RX2 is electrically connected to the third end of common mode inductor LF1. Resistors RX3 and RX4 are connected in series and connected between the third and fourth ends of common mode inductor LF1. One end of resistor RX3 is electrically connected to the fourth end of common mode inductor LF1. The other end of resistor RX3 is electrically connected to one end of resistor RX4. The other end of resistor RX4 is electrically connected to the third end of common mode inductor LF1. Resistors RX1 and RX2 are electrically connected to resistors RX3 and RX4. Capacitor CX1 is connected between the third and fourth ends of common mode inductor LF1.

3. The compact multi-port charging circuit as described in claim 2, characterized in that: A fuse F1 is provided before the front end of the electromagnetic interference module 100; Fuse F1 is located on the live wire. One end of fuse F1 is electrically connected to the live wire, and the other end of fuse F1 is electrically connected to the second end of common mode inductor L1.

4. The compact multi-port charging circuit as described in claim 2, characterized in that: The pulse width modulation control module 500 in the circuit includes: The main control chip U4, diode D2, resistors R9, R27, R30, R47, R48, capacitors C11, C12, C15, C27, C35, thermistor NTC2, and the receiver of optocoupler U2A. The first pin of the main control chip U4 is grounded through the thermistor NTC2; the second pin is grounded through resistor R47; the third pin is grounded through the receiver of the optocoupler U2A (connected in series) and capacitor C11; the fourth pin is grounded through resistor R27 and capacitor C15 (connected in series); the fourth pin is electrically connected to the fourth terminal of the primary side of transformer T1 through series resistor R9; the fifth pin is electrically connected to the fifth pin of the auxiliary control chip located on the primary side of transformer T1 through series resistor R30; the fifth pin is grounded through series capacitor C12; the sixth pin is grounded; and the main control chip U4... The sixth pin of the main control chip U4 is electrically connected to the second pin of the auxiliary control chip via a series capacitor C35. The seventh pin of the main control chip U4 is electrically connected to the third pin (PWM pin) of the auxiliary control chip. The eighth pin of the main control chip U4 is electrically connected to the chip power supply module 400 and the second pin of the auxiliary control chip. The tenth pin of the main control chip U4 is electrically connected to the B+ terminal via a series resistor R48 and a diode D2. One end of the resistor R48 is electrically connected to the tenth pin of the main control chip U4, and the other end of the resistor R48 is electrically connected to the negative terminal of the diode D2. The positive terminal of the diode D2 is grounded. The end of the resistor R48 furthest from the tenth pin of the main control chip U4 is electrically connected to a capacitor C27, and the other end of the capacitor C27 is grounded.

5. The compact multi-port charging circuit as described in claim 4, characterized in that: The rectifier and filter module 200 in the circuit includes: Diodes D3, D4, D5, and D6; polarized capacitors EC1 and EC2; capacitors C18, C18A, C40, C44, and C47; and differential mode inductor L1. The anode of diode D3 is electrically connected to the third terminal of common-mode inductor LF1, and the cathode of diode D3 is electrically connected to the second terminal of differential-mode inductor L1. The anode of diode D4 is electrically connected to the fourth terminal of common-mode inductor LF1, and the cathode of diode D4 is electrically connected to the first terminal of differential-mode inductor L1. The cathodes of diodes D3 and D4 are interconnected. The cathode of diode D5 is electrically connected to the fourth terminal of common-mode inductor LF1, and the cathode of diode D6 is electrically connected to the third terminal of common-mode inductor LF1. The anodes of diodes D5 and D6 are connected in series with polarized capacitors EC1 and C.

18. Capacitor C18A is electrically connected to the first terminal of differential mode inductor L1. The positive terminal of polarized capacitor EC1 is electrically connected to the first terminal of differential mode inductor L1. The negative terminal of polarized capacitor EC1 is electrically connected to the positive terminals of diodes D5 and D6. The positive terminals of diodes D5 and D6 are electrically connected to the two terminals of differential mode inductor L1 through polarized capacitors EC2, C40, and C44, which are connected in series. The positive terminal of polarized capacitor EC2 is electrically connected to the first terminal of differential mode inductor L1. The negative terminal of polarized capacitor EC2 is electrically connected to the positive terminals of diodes D5 and D6.

6. The compact multi-port charging circuit as described in claim 5, characterized in that: The synchronous rectification module 500 in the circuit includes: Rectifier chip U5, resistors R49, R50, R51, capacitors C20A, C36, C37, C38, C39, MOSFET Q5, polarized capacitor EC4, and polarized capacitor EC5. The seventh and eighth terminals of the secondary side of transformer T1 are electrically connected to the VIN terminal. The fifth and sixth terminals of the secondary side of transformer T1 are electrically connected to the drain of MOSFET Q5. The source of MOSFET Q5 is electrically connected to the VIN terminal through capacitors C37, C39, EC4, and EC5 connected in parallel. The positive terminals of EC4 and EC5 are electrically connected to the VIN terminal, and the negative terminals of EC4 and EC5 are electrically connected to the source of MOSFET Q5 and grounded. The gate of MOSFET Q5 is electrically connected to the fifth pin of rectifier chip U5. The drain and source of MOSFET Q5 are electrically connected through resistor R51 and capacitor C20A connected in series. One end of resistor R51 is electrically connected to the gate of MOSFET Q5, and the other end of resistor R51 is electrically connected to one end of capacitor C20A. The other end of capacitor C20A is electrically connected to the source of MOSFET Q5. The fifth and sixth terminals of the secondary side of transformer T1 are electrically connected to the sixth pin of rectifier chip U5 through series resistor R50. The fourth pin of rectifier chip U5 is electrically connected to the source of MOSFET Q5 through series capacitor C36. The first pin of rectifier chip U5 is electrically connected to the source of MOSFET Q5 through series capacitor C38. The second pin of rectifier chip U5 is electrically connected to the source of MOSFET Q5. The third pin of rectifier chip U5 is electrically connected to the source of MOSFET Q5 through series resistor R49.

7. The compact multi-port charging circuit as described in claim 6, characterized in that: The chip protocol module 700 in the circuit includes: Resistors R2, R3, R15, R18, R33, capacitors C1, C2, C6, C7, C8, C9, C19, C23, C24, the light source of optocoupler U2A, MOSFET Q2, MOSFET Q4, and the protocol control chip; The VIN terminal is electrically connected to the light source of optocoupler U2A via resistor R2 and to resistor R3 via capacitor C1. The branch formed by resistor R2 and the light source of optocoupler U2A is connected in series with the branch formed by capacitor C1 and resistor R3. Resistor R2 and the light source of optocoupler U2A are electrically connected. One end of the light source of optocoupler U2A is electrically connected to resistor R2. The other end of the light source of optocoupler U2A is electrically connected to the second pin (VFB1) of the protocol control chip via capacitor C23 and resistor R15 (connected in series). The other end of the light source of optocoupler U2A is electrically connected to the third pin of the protocol control chip via capacitor C24 and resistor R18 (connected in series). The first pin (VCC) of the protocol control chip is grounded via capacitor C19 (connected in series). Capacitor C19 is located away from the protocol control chip. One end of the protocol control chip is electrically connected to the VIN terminal via capacitors C6 and C7 connected in parallel. The VIN terminal is electrically connected to the drain of MOSFET Q2. The source of MOSFET Q2 is electrically connected to the source of MOSFET Q4. The gates of both MOSFET Q2 and Q4 are electrically connected to pin 31 of the protocol control chip. The gates of MOSFET Q2 and Q4, and the source of MOSFET Q2 and Q4 are electrically connected via resistor R33. The drain of MOSFET Q4 is electrically connected to pins 38 and 39 of the protocol control chip. Pin 38 of the protocol control chip is electrically connected to capacitors C6 and C7 via capacitors C8 and C9 connected in parallel. The protocol control chip is electrically connected to at least one charging interface via the first peripheral circuit.

8. The compact multi-port charging circuit as described in claim 7, characterized in that: The buck-boost converter module 600 in the circuit includes: Resistors R7, R10, R32, R37, R39; capacitors C01, C02, C03, C04, C13, C31, C30, C31A, C32, C33, C45, C45A, C51, C52; polarized capacitor EC3; polarized capacitor EC6; differential mode inductor L2; and buck-boost control chip U1. The second pin of the buck-boost control chip U1 is electrically connected to the VIN terminal. The second pin of the buck-boost control chip U1 is grounded through capacitors C02, C03, C04, C15, C31, and C31A connected in parallel, as well as polarized capacitor EC6. The positive terminal of polarized capacitor EC6 is grounded, and the negative terminal of polarized capacitor EC6 is electrically connected to the second pin of the buck-boost control chip U1. The twelfth and thirteenth pins of the buck-boost control chip U1 are electrically connected through a differential-mode inductor L2. One end of the differential-mode inductor L2 is electrically connected to the eleventh pin of the buck-boost control chip U1 through capacitor C32, and the other end of the differential-mode inductor L2 is electrically connected to the fourteenth pin of the buck-boost control chip U1 through capacitor C30. The fourth pin of the buck-boost control chip U1 is connected through capacitors C33, C4, C5, C31A, and C31A connected in parallel.

45. Capacitor C45A is grounded. The fourth pin of the buck-boost control chip U1 is electrically connected to the seventeenth pin of the buck-boost control chip U1 through a series connection of resistor R37, capacitor C13, and resistor R10. A resistor R7 is connected in series with capacitor C13. Resistor R37 and capacitor C13 are grounded through a parallel connection of polarized capacitor EC3 and capacitor C25. The negative terminal of polarized capacitor EC3 is grounded, and the positive terminal of polarized capacitor EC3 is electrically connected to resistor R37. The fifth and sixth pins of the buck-boost control chip U1 are respectively connected to the two ends of resistor R37 and electrically connected through capacitor C01. The end of resistor R10 away from the seventeenth pin of the buck-boost control chip U1 is grounded through resistor R32. Resistor R7 is electrically connected to resistor R32. The end of resistor R7 away from resistor R32 is electrically connected to the drain of MOSFET Q4.

9. The compact multi-port charging circuit as described in claim 4, characterized in that: The chip power supply module 400 in the circuit includes: Resistor R29, resistor R31, polarized capacitor C14, capacitor C29, diode D8, and power supply control chip U6; The first pin of the power supply control chip U6 is electrically connected to the eighth pin of the main control chip U4 through a series resistor R31. The first pin of the power supply control chip U6 is grounded through a series capacitor C16. The second pin of the power supply control chip U6 is grounded. The third pin of the power supply control chip U6 is electrically connected to the fourth terminal of the primary side of the transformer T1 through a series diode D8 and a resistor R29. The cathode of the diode D8 is electrically connected to the third pin of the power supply control chip U6, and the anode of the diode D8 is electrically connected to the resistor R29. The other end of the resistor R29 is electrically connected to the fourth terminal of the primary side of the transformer T1. The third pin of the power supply control chip U6 is grounded through a parallel polarized capacitor C14 and a capacitor C29. The anode of the polarized capacitor C14 is electrically connected to the third pin of the power supply control chip U6, and the cathode of the polarized capacitor C14 is grounded.

10. A switching power supply, characterized in that: The switching power supply includes: A compact multi-port charging circuit according to any one of claims 1-9.

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