Combined gallium nitride rapid charging device

Abstract

The utility model discloses a combined type gallium nitride rapid charging device, which comprises a shell, 16 USB Type-A charging interfaces and 16 USB Type-C charging interfaces are arranged on the shell, 8 AC-DC gallium nitride charging modules which are connected in parallel are arranged in the shell, and each AC-DC gallium nitride charging module is correspondingly connected with two USB Type-A charging interfaces and two USB Type-C charging interfaces. The combined gallium nitride rapid charging device is provided with 16 USB Type-A charging interfaces and 16 USB Type-C charging interfaces, can meet the requirement of charging a plurality of electronic devices at the same time, is installed in a fixed place, and can carry out centralized management charging on the electronic devices such as a mobile phone, a tablet computer and the like; according to the utility model, the output charging voltage can be adjusted according to the equipment accessed by the charging interface, and the multi-voltage charging requirements of different electronic equipment can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of charging equipment, and in particular to a combined gallium nitride fast charging device. Background Art

[0002] Currently, most of the commonly used mobile phone / tablet chargers on the market are in the form of charging heads. Some socket-type combined chargers generally have 2-4 charging interfaces, which are too few and cannot meet the needs of charging multiple electronic devices at the same time. In addition, existing chargers need to match the corresponding charging protocol to charge normally, and the charging voltage is fixed and cannot be adjusted, which cannot meet the multi-voltage charging needs of different electronic devices. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a combined gallium nitride fast charging device that can meet the needs of charging multiple electronic devices at the same time.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A combined gallium nitride fast charging device includes a shell, on which 16 USB Type-A charging interfaces and 16 USB Type-C charging interfaces are arranged, and 8 AC-DC gallium nitride charging modules connected in parallel are arranged in the shell, and each AC-DC gallium nitride charging module is correspondingly connected to 2 USB Type-A charging interfaces and 2 USB Type-C charging interfaces.

[0006] Preferably, the AC-DC gallium nitride charging module includes a rectifier module and two charging control modules, and the charging control module includes: a first filter circuit, which is used to filter the direct current output by the rectifier module after rectification and output a stable direct current voltage; a switching transformer, whose primary coil is connected to the output end of the first filter circuit; a power management chip, which is used to control the on / off of the primary coil of the switching transformer so that the secondary coil of the switching transformer outputs electric energy; a synchronous rectifier circuit, which is connected to the secondary coil of the switching transformer, and is used to rectify the current output by the secondary coil of the switching transformer and output direct current; a second filter circuit, which is used to filter the direct current output by the synchronous rectifier circuit and output a stable direct current voltage; a dual-interface charging control circuit, whose input end is connected to the output end of the second filter circuit, and the output end is respectively connected to a USB Type-A charging interface and a USB Type-C charging interface, which is used to charge the battery according to the USB Type-A charging interface or the USB The device connected to the Type-C charging interface outputs a corresponding feedback signal to the power management chip to control the switching frequency and duty cycle of the primary coil of the switching transformer; an auxiliary power supply circuit is connected to the secondary winding of the switching transformer to power the power management chip.

[0007] Preferably, the first filtering circuit includes capacitor EC1, capacitor EC2, capacitor C7 and inductor L1, one end of the inductor L1 is connected to the positive electrode of the capacitor EC1 and the output end of the rectifier module, the other end of the inductor L1 is connected to the positive electrode of the capacitor EC2 and the primary coil of the switching transformer, the negative electrode of the capacitor EC1 and the negative electrode of the capacitor EC2 are grounded, and the capacitor C7 is connected in parallel with the capacitor EC2.

[0008] Preferably, the synchronous rectification circuit includes a synchronous rectification power supply chip U2 with model MK91808H, a resistor R11, a resistor R12, a capacitor C10, a capacitor C14 and a MOS tube Q2, wherein pin 1 and pin 6 of the synchronous rectification power supply chip U2 are correspondingly connected to the two ends of the secondary coil of the switching transformer, pin 2 of the synchronous rectification power supply chip U2 is connected to the signal ground, pin 3 of the synchronous rectification power supply chip U2 is connected to the signal ground through the resistor R11, pin 4 of the synchronous rectification power supply chip U2 is connected to the signal ground through the capacitor C10, the gate of the MOS tube Q2 is connected to pin 5 of the synchronous rectification power supply chip U2, the drain of the MOS tube Q2 is connected to pin 6 of the synchronous rectification power supply chip U2, the source of the MOS tube Q2 is connected to the signal ground, one end of the capacitor C14 is connected to pin 6 of the synchronous rectification power supply chip U2, and the other end of the capacitor C14 is connected to the signal ground through the capacitor C12.

[0009] Preferably, the second filtering circuit includes a capacitor EC5 and a capacitor C13, the positive electrode of the capacitor EC5 is connected to the output end of the synchronous rectification circuit, the negative electrode of the capacitor EC5 is connected to the signal ground, and the capacitor C13 is connected in parallel with the capacitor EC5.

[0010] Preferably, the dual-port charging control circuit includes a dual-port charging controller chip U101 of model XPD738BF, a MOS tube Q101, a resistor R103, a resistor R104, a resistor R105, a resistor R106, a resistor R108, a capacitor C101, a capacitor C105, a transient suppression diode TV101 and a light-emitting diode LD1, pin 1 of the dual-port charging controller chip U101, pin 2 of the dual-port charging controller chip U101, and a source electrode of the MOS tube Q101 are connected to the output end of the second filtering circuit, pins 15 and 16 of the dual-port charging controller chip U101 are connected to pins A4, B9, A9, and B4 of the USB Type-C charging interface, pin 13 of the dual-port charging controller chip U101 is connected to pin A5 of the USB Type-C charging interface, pin 14 of the dual-port charging controller chip U101 is connected to pin B5 of the USB Type-C charging interface, and pin 11 of the dual-port charging controller chip U101 is connected to pin The A6 and B6 pins of the Type-C charging interface are connected, the 12th pin of the dual-port charging controller chip U101 is connected to the A7 and B7 pins of the USB Type-C charging interface, the 9th pin of the dual-port charging controller chip U101 is connected to the 3rd pin of the USB Type-A charging interface, the 10th pin of the dual-port charging controller chip U101 is connected to the 2nd pin of the USB Type-A charging interface, the 6th pin of the dual-port charging controller chip U101 is connected to the 4th, 5th and 6th pins of the USB Type-A charging interface, the 7th pin of the dual-port charging controller chip U101 is connected to the gate of the MOS tube Q101, the 8th pin of the dual-port charging controller chip U101 is connected to the drain of the MOS tube Q101, the drain of the MOS tube Q101 is connected to the 1st pin of the USB Type-A charging interface, the resistor R103, the capacitor C101 and the transient suppression diode TV101 are connected in parallel to the output end of the second filtering circuit, the resistor R108 and the light emitting diode LD1 are connected in series with the transient suppression diode TV101. The diode TV101 is connected in parallel, one end of the resistor R104 is connected to the output end of the second filter circuit, the other end of the resistor R104 is connected to the signal ground through the resistor R105, the connection point between the resistor R104 and the resistor R105 is connected to the 4th pin of the dual-port charging controller chip U101, the 4th pin of the dual-port charging controller chip U101 is connected to the 3rd pin of the dual-port charging controller chip U101 through the capacitor C105 and the resistor R106, and the 3rd pin of the dual-port charging controller chip U101 is connected to the power management chip.

[0011] Preferably, the charging control module also includes an isolation circuit, which includes an optocoupler U3, a resistor R7 and a resistor R8, pin 1 of the optocoupler U3 is connected to the output end of the second filter circuit through the resistor R7, pin 2 of the optocoupler U3 is connected to pin 3 of the dual-port charging controller chip U101, resistor R8 is connected between pin 1 of the optocoupler U3 and pin 2 of the optocoupler U3, pin 4 of the optocoupler U3 is connected to the power management chip, and pin 3 of the optocoupler U3 is grounded.

[0012] Preferably, the power management chip adopts a chip with model number DK035G, and the auxiliary power supply circuit includes a transistor Q1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C2, a capacitor C3, a capacitor C8, a capacitor C9, a diode D2 and a voltage regulator diode ZD1, one end of the resistor R3 is connected to the secondary winding of the switching transformer, the other end of the resistor R3 is grounded through the resistor R4, the connection point between the resistor R3 and the resistor R4 is connected to the 1st pin of the power management chip, and the anode of the diode D2 is connected to the secondary winding of the switching transformer. The cathode of the diode D2 is connected to the collector of the transistor Q1, the base of the transistor Q1 is connected to the cathode of the Zener diode ZD1, the anode of the Zener diode ZD1 is grounded, the emitter of the transistor Q1 is connected to pin 3 of the power management chip, the emitter of the transistor Q1 is grounded through the capacitor C8, the collector of the transistor Q1 is grounded through the capacitor C3, the resistor R5 is connected between the collector of the transistor Q1 and the base of the transistor Q1, the capacitor C9 is connected in parallel with the Zener diode ZD1, and the resistor R2 is connected in series with the capacitor C2 and then connected in parallel with the diode D2.

[0013] Preferably, the charging control module further includes a peak absorption circuit, and the peak absorption circuit is connected in parallel with the primary coil of the switching transformer.

[0014] Preferably, the input side of the rectifier module is connected with an EMI circuit, a lightning protection circuit, a surge protection circuit and an overcurrent protection circuit in sequence from near to far.

[0015] The beneficial technical effect of the utility model is that the above-mentioned combined gallium nitride fast charging device has 16 USB Type-A charging interfaces and 16 USB Type-C charging interfaces, which can meet the needs of charging multiple electronic devices at the same time. It can be installed in a fixed place and can centrally manage and charge electronic devices such as mobile phones and tablets. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the external structure of the combined gallium nitride fast charging device of the utility model;

[0017] Figure 2 This is a circuit structure block diagram of the AC-DC gallium nitride charging module of the utility model;

[0018] Figure 3 The circuit schematic diagram of the AC module and the first charging control module of the utility model;

[0019] Figure 4 This is a circuit schematic diagram of the dual-interface charging control circuit of the utility model. DETAILED DESCRIPTION

[0020] In order to enable ordinary technicians in the field to more clearly understand the purpose, technical solutions and advantages of the utility model, the utility model is further explained below in conjunction with the accompanying drawings and embodiments.

[0021] like Figure 1-2 As shown, in one embodiment of the utility model, the combined gallium nitride fast charging device includes a housing 100, on which 16 USB Type-A charging interfaces 101 and 16 USB Type-C charging interfaces 102 are arranged, and 8 AC-DC gallium nitride charging modules are arranged in the housing 100, and each AC-DC gallium nitride charging module is connected to 2 USB Type-A charging interfaces 101 and 2 USB Type-C charging interfaces 102. The 8 AC-DC gallium nitride charging modules are connected in parallel with each other and connected to the AC input terminal through a power switch 103.

[0022] The AC-DC gallium nitride charging module includes an AC module 10, a first charging control module 20 and a second charging control module 30, and the AC module 10 is respectively connected to the input ends of the first charging control module 20 and the second charging control module 30. In the embodiment shown in the accompanying drawings, the AC module 10 includes a rectifier module 11, an EMI circuit 12, a lightning protection circuit 13, an anti-surge circuit 14 and an overcurrent protection circuit 15; of course, in other embodiments of the utility model, the AC module 10 may include a rectifier module 11, or may include a rectifier module 11 and any one or any combination of the EMI circuit 12, the lightning protection circuit 13, the anti-surge circuit 14 and the overcurrent protection circuit 15.

[0023] like Figure 3As shown, the rectifier module 11 adopts a rectifier bridge DB1 of model MSB40M, the EMI circuit 12 adopts a common mode interference suppression coil LF1 to achieve an anti-interference function, the lightning protection circuit 13 adopts a lightning protection varistor VAR1 of model 10D561 to achieve a lightning protection function, the surge protection circuit 14 adopts a thermistor RT1 of model NTC50D-9 to achieve a surge protection function, and the overcurrent protection circuit 15 adopts a fuse F1 to achieve an overcurrent protection function. In other embodiments, the rectifier module 11, the EMI circuit 12, the lightning protection circuit 13, the surge protection circuit 14 and the overcurrent protection circuit 15 can also use existing technologies to achieve corresponding circuit functions, which will not be repeated here.

[0024] like Figure 2 , 3 As shown, the first charging control module 20 includes a filter circuit 21, a switching transformer T1, a power management chip U1, a synchronous rectification circuit 22, a filter circuit 23, a dual-interface charging control circuit 24 and an auxiliary power supply circuit 25; the filter circuit 21 is used to filter the DC power output after rectification by the rectification module 11 and output a stable DC voltage; the primary coil of the switching transformer T1 is connected to the output end of the filter circuit 21; the power management chip U1 is used to control the on / off of the primary coil of the switching transformer T1 so that the secondary coil of the switching transformer T1 outputs electric energy; the synchronous rectification circuit 22 is connected to the secondary coil of the switching transformer T1, and is used to rectify the current output by the secondary coil of the switching transformer T1 and output DC power; the filter circuit 23 is used to filter the DC power output by the synchronous rectification circuit 22 and output a stable DC voltage; the input end of the dual-interface charging control circuit 24 is connected to the output end of the filter circuit 23, and the output end is respectively connected to a USB Type-A charging interface 101 and a USB Type-C charging interface 102, which are used according to the USB The device connected to the Type-A charging interface 101 or the USB Type-C charging interface 102 outputs a corresponding feedback signal to the power management chip U1 to control the switching frequency and duty cycle of the primary coil of the switching transformer T1; the auxiliary power supply circuit 25 is connected to the secondary winding of the switching transformer T1 to power the power management chip U1.

[0025] like Figure 3 As shown, the filter circuit 21 is composed of capacitors EC1, EC2, C7 and inductor L1, and filters the DC power output after rectification by the rectifier module 11 to obtain a stable high-voltage DC voltage. In other embodiments, the circuit structure and function of the filter circuit 21 can also be implemented using existing technologies.

[0026] like Figure 3As shown, a synchronous rectification circuit 22 is formed by a synchronous rectification power chip U2 of model MK91808H, a resistor R11, a resistor R12, a capacitor C10, a capacitor C14 and a MOS tube Q2. Pins 1 and 6 of the synchronous rectification power chip U2 are connected to the two ends of the secondary coil of the switching transformer T1, respectively. Pin 2 of the synchronous rectification power chip U2 is connected to the signal ground, pin 3 of the synchronous rectification power chip U2 is connected to the signal ground through the resistor R11, pin 3 of the synchronous rectification power chip U2 is connected to the signal ground through the capacitor C10, the gate of the MOS tube Q2 is connected to pin 5 of the synchronous rectification power chip U2, the drain of the MOS tube Q2 is connected to pin 6 of the synchronous rectification power chip U2, the source of the MOS tube Q2 is connected to the signal ground, one end of the capacitor C14 is connected to pin 6 of the synchronous rectification power chip U2, and the other end of the capacitor C14 is connected to the signal ground through the capacitor C12. In other embodiments, the circuit structure and function of the synchronous rectification circuit 22 can also be implemented using existing technologies.

[0027] like Figure 3 As shown, the filter circuit 23 includes a capacitor EC5 and a capacitor C13, the positive electrode of the capacitor EC5 is connected to the output end of the synchronous rectification circuit 22, the negative electrode of the capacitor EC5 is connected to the signal ground, and the capacitor C13 is connected in parallel with the capacitor EC5. In other embodiments, the circuit structure and function of the filter circuit 23 can also be implemented using existing technologies.

[0028] like Figure 3 As shown, the switching transformer T1 adopts an ATQ18 transformer, the power management chip U1 adopts a chip model DK035G, and the auxiliary power supply circuit 25 includes a transistor Q1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C2, a capacitor C3, a capacitor C8, a capacitor C9, a diode D2 and a voltage regulator diode ZD1. One end of the resistor R3 is connected to the secondary winding of the switching transformer T1, the other end of the resistor R3 is grounded through the resistor R4, the connection point between the resistor R3 and the resistor R4 is connected to the pin 1 of the power management chip U1, the anode of the diode D2 is connected to the secondary winding of the switching transformer T1, the cathode of the diode D2 is connected to the collector of the transistor Q1, the base of the transistor Q1 is connected to the cathode of the voltage-stabilizing diode ZD1, the anode of the voltage-stabilizing diode ZD1 is grounded, the emitter of the transistor Q1 is connected to the pin 3 of the power management chip U1, the emitter of the transistor Q1 is grounded through the capacitor C8, the collector of the transistor Q1 is grounded through the capacitor C3, the resistor R5 is connected between the collector of the transistor Q1 and the base of the transistor Q1, the capacitor C9 is connected in parallel with the voltage-stabilizing diode ZD1, and the resistor R2 is connected in series with the capacitor C2 and then connected in parallel with the diode D2. In other embodiments, the switching transformer T1 may also use other types of transformers, and the power management chip U1 may also use other types of chips.

[0029] like Figure 2 , 3 As shown, the first charging control module 20 also includes a peak absorption circuit 27, which is connected in parallel with the primary coil of the switching transformer T1. The peak absorption circuit 27 is composed of a diode TV1, a diode D1, a resistor R1 and a capacitor C1, and is used to absorb the peak voltage generated by the switching action of the switching transformer T1. In other embodiments, the circuit structure and function of the peak absorption circuit 27 can also be implemented using existing technologies.

[0030] like Figure 4As shown, the dual-port charging control circuit 24 is composed of a dual-port charging controller chip U101 of model XPD738BF, a MOS tube Q101, a resistor R103, a resistor R104, a resistor R105, a resistor R106, a resistor R108, a capacitor C101, a capacitor C105, a transient suppression diode TV101 and a light-emitting diode LD1. Pin 1 of the dual-port charging controller chip U101, pin 2 of the dual-port charging controller chip U101, and the source electrode (pins S1, S2, and S3) of the MOS tube Q101 are connected to the output end of the filter circuit 23, pins 15 and 16 of the dual-port charging controller chip U101 are connected to pins A4, B9, A9, and B4 of the USB Type-C charging interface, pin 13 of the dual-port charging controller chip U101 is connected to pin A5 of the USB Type-C charging interface, and pin 14 of the dual-port charging controller chip U101 is connected to pin The B5 pin of the Type-C charging interface is connected, the 11th pin of the dual-port charging controller chip U101 is connected to the A6 and B6 pins of the USB Type-C charging interface, the 12th pin of the dual-port charging controller chip U101 is connected to the A7 and B7 pins of the USB Type-C charging interface, the 9th pin of the dual-port charging controller chip U101 is connected to the 3rd pin of the USB Type-A charging interface, the 10th pin of the dual-port charging controller chip U101 is connected to the 2nd pin of the USB Type-A charging interface, the 6th pin of the dual-port charging controller chip U101 is connected to the 4th, 5th and 6th pins of the USB Type-A charging interface, the 7th pin of the dual-port charging controller chip U101 is connected to the gate (G pin) of the MOS tube Q101, the 8th pin of the dual-port charging controller chip U101 is connected to the drain (D1, D2, D3, D4 and D5 pins) of the MOS tube Q101, and the drain of the MOS tube Q101 is connected to the USB Pin 1 of the Type-A charging interface is connected, resistor R103, capacitor C101 and transient suppression diode TV101 are connected in parallel to the output end of the filter circuit 22, resistor R108 and light emitting diode LD1 are connected in series and connected in parallel with the transient suppression diode TV101, one end of the resistor R104 is connected to the output end of the filter circuit 22, the other end of the resistor R104 is connected to the signal ground through the resistor R105, the connection point between the resistor R104 and the resistor R105 is connected to pin 4 of the dual-port charging controller chip U101, the 4th pin of the dual-port charging controller chip U101 is connected to pin 3 of the dual-port charging controller chip U101 through the capacitor C105 and the resistor R106, and the 3rd pin of the dual-port charging controller chip U101 is connected to the power management chip U1.

[0031] like Figure 2 , 3As shown, in a preferred embodiment, the first charging control module 20 also includes an isolation circuit 26, and the isolation circuit 26 includes an optocoupler U3, a resistor R7 and a resistor R8. Pin 1 of the optocoupler U3 is connected to the output end of the filter circuit 22 through the resistor R7, and pin 2 of the optocoupler U3 is connected to pin 3 of the dual-port charging controller chip U101. The resistor R8 is connected between pin 1 of the optocoupler U3 and pin 2 of the optocoupler U3. Pin 4 of the optocoupler U3 is connected to the power management chip U1, and pin 3 of the optocoupler U3 is grounded.

[0032] The circuit structure and circuit function of the second charging control module 30 are the same as those of the first charging control module 20. Figure 2 As shown, the second charging control module 30 includes a filtering circuit 31, a switching transformer, a power management chip, a synchronous rectification circuit 32, a filtering circuit 33, a dual-interface charging control circuit 34, an auxiliary power supply circuit 35, an isolation circuit 36 ​​and a peak absorption circuit 37. The specific circuit modules inside the second charging control module 30 have the same structure and function as the specific circuit modules inside the first charging control module 20, which will not be repeated here.

[0033] The working principle of the AC-DC gallium nitride charging module of the present utility model embodiment is as follows:

[0034] After the AC power supply is connected, it passes through the fuse F1, then the thermistor RT1 of the surge protection circuit 14, then the lightning protection varistor VAR1, and then through the common mode interference suppression coil LF1, enters the MBS40M rectifier bridge DB1 for rectification, and then passes through the capacitor EC1, inductor L1, capacitor EC2, and capacitor C7 for filtering to obtain a stable high-voltage DC connected to the primary coil of the switching transformer T1 and the power management chip U1. When the power management chip U1 controls the primary coil of the switching transformer T1 to be turned on, the switching transformer T1 is magnetized. When the power management chip U1 controls the primary coil of the switching transformer T1 to be turned off, the magnetic energy of the switching transformer T1 is converted into electrical energy output through the secondary coil, and then rectified by the synchronous rectification circuit 22, filtered by capacitor EC5 and capacitor C13 to be a stable DC voltage VO1 output.

[0035] The DC voltage VO1 is connected to the S (source) electrode of the dual-port charging controller chip U101 and the MOS tube Q101 respectively, and the dual-port charging controller chip U101 controls the output voltage to the VBUS1 of the USB Type-C charging interface 102, or controls the output voltage to the VBUS2 of the USB Type-A charging interface 101 by controlling the D (drain) electrode of the MOS tube Q101; at the same time, the dual-port charging controller chip U101 is connected to the USB Type-C charging interface 102 through pins 11-14 (CC11, CC12, DM1 / DP1), and is connected to the USB Type-C charging interface 102 through pins 9 and 10 (DM2 / DP2). Type-A charging interface 101, when an electronic device such as a mobile phone or tablet is connected, protocol communication is performed (supporting BC1.2 protocol, Apple proprietary charging protocol, Samsung, China Telecom protocol, Huawei charging protocol, as well as Qualcomm QC fast charging, Type-CPD fast charging and other mainstream charging protocols), and the most suitable charging voltage and current (power) are determined. The feedback loop control of the output specific voltage is as follows: the DC voltage VO1 is divided by resistors R4 and R5 and then compared with the internal reference circuit through the 4th pin of the dual-port charging controller chip U101. Based on the comparison result, the corresponding signal OPT01 is output through the 2nd pin of the dual-port charging controller chip U101 to control the optocoupler U3, and a feedback signal is established to the power management chip U1. The power management chip U1 controls the switching frequency and duty cycle of the primary coil of the switching transformer according to the feedback signal, thereby achieving the output voltage stability at 5V, 9V, 12V or other protocol voltage values.

[0036] The above is the working process of the AC-DC gallium nitride charging module charging the electronic device through the first charging control module 20. The working process of the AC-DC gallium nitride charging module charging the electronic device through the second charging control module 30 is the same as the working process of the AC-DC gallium nitride charging module charging the electronic device through the first charging control module 20, which will not be repeated here.

[0037] The beneficial technical effects of the utility model are:

[0038] (1) The combined GaN fast charging device has 16 USB Type-A charging ports and 16 USB Type-C charging ports, which can meet the needs of charging multiple electronic devices at the same time. It can be installed in a fixed place and can centrally manage and charge electronic devices such as mobile phones and tablets.

[0039] (2) The AC-DC gallium nitride charging module includes a rectifier module and two charging control modules. The charging control module includes a switching transformer, a power management chip and a dual-interface charging control circuit. The dual-interface charging control circuit can output a corresponding feedback signal to the power management chip according to the device connected to the USB Type-A charging interface or the USB Type-C charging interface, so as to control the switching frequency and duty cycle of the primary coil of the switching transformer, thereby adjusting the charging voltage and meeting the multi-voltage charging requirements of different electronic devices.

[0040] (3) The power management chip adopts a high-performance AC-DC gallium nitride power management chip, which has the characteristics of high switching frequency and low on-resistance. It improves the switching energy conversion density and reduces the product volume while maintaining low heat generation characteristics and has good heat dissipation performance.

[0041] The above description is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Those skilled in the art can make various equivalent changes and improvements based on the above embodiments, and all equivalent changes or modifications made within the scope of the claims should fall within the protection scope of the utility model.

Claims

1. A combined gallium nitride fast charging device, characterized in that: The invention comprises a shell, on which 16 USB Type-A charging interfaces and 16 USB Type-C charging interfaces are arranged, and in the shell, 8 AC-DC gallium nitride charging modules connected in parallel are arranged, and each AC-DC gallium nitride charging module is connected to 2 USB Type-A charging interfaces and 2 USB Type-C charging interfaces correspondingly; The AC-DC gallium nitride charging module includes a rectifier module and two charging control modules, and the charging control module includes: A first filtering circuit, used for filtering the DC power output after rectification by the rectifying module to output a stable DC voltage; A switching transformer, wherein a primary coil thereof is connected to an output end of the first filtering circuit; A power management chip, used to control the on / off of the primary coil of the switching transformer so that the secondary coil of the switching transformer outputs electrical energy; A synchronous rectification circuit, connected to the secondary coil of the switching transformer, for rectifying the current output by the secondary coil of the switching transformer to output direct current; A second filtering circuit, used for filtering the direct current output by the synchronous rectification circuit to output a stable direct current voltage; A dual-interface charging control circuit, wherein the input end is connected to the output end of the second filter circuit, and the output end is respectively connected to a USB Type-A charging interface and a USB Type-C charging interface, and is used to output a corresponding feedback signal to the power management chip according to the device connected to the USB Type-A charging interface or the USB Type-C charging interface, so as to control the switching frequency and duty cycle of the primary coil of the switching transformer; An auxiliary power supply circuit is connected to the secondary winding of the switching transformer and is used to supply power to the power management chip.

2. The combined gallium nitride fast charging device according to claim 1, characterized in that: The first filtering circuit includes capacitor EC1, capacitor EC2, capacitor C7 and inductor L1, one end of the inductor L1 is connected to the positive electrode of the capacitor EC1 and the output end of the rectifier module, the other end of the inductor L1 is connected to the positive electrode of the capacitor EC2 and the primary coil of the switching transformer, the negative electrode of the capacitor EC1 and the negative electrode of the capacitor EC2 are grounded, and the capacitor C7 is connected in parallel with the capacitor EC2.

3. The combined gallium nitride fast charging device according to claim 1, characterized in that: The synchronous rectification circuit includes a synchronous rectification power supply chip U2 of model MK91808H, a resistor R11, a resistor R12, a capacitor C10, a capacitor C14 and a MOS tube Q2. Pin 1 and pin 6 of the synchronous rectification power supply chip U2 are correspondingly connected to the two ends of the secondary coil of the switching transformer, pin 2 of the synchronous rectification power supply chip U2 is connected to the signal ground, pin 3 of the synchronous rectification power supply chip U2 is connected to the signal ground through the resistor R11, pin 4 of the synchronous rectification power supply chip U2 is connected to the signal ground through the capacitor C10, the gate of the MOS tube Q2 is connected to pin 5 of the synchronous rectification power supply chip U2, the drain of the MOS tube Q2 is connected to pin 6 of the synchronous rectification power supply chip U2, the source of the MOS tube Q2 is connected to the signal ground, one end of the capacitor C14 is connected to pin 6 of the synchronous rectification power supply chip U2, and the other end of the capacitor C14 is connected to the signal ground through the capacitor C12.

4. The combined gallium nitride fast charging device according to claim 1, characterized in that: The second filtering circuit includes a capacitor EC5 and a capacitor C13. The positive electrode of the capacitor EC5 is connected to the output end of the synchronous rectification circuit, the negative electrode of the capacitor EC5 is connected to the signal ground, and the capacitor C13 is connected in parallel with the capacitor EC5.

5. The combined gallium nitride fast charging device according to claim 1, characterized in that: The dual-port charging control circuit includes a dual-port charging controller chip U101 of model XPD738BF, a MOS tube Q101, a resistor R103, a resistor R104, a resistor R105, a resistor R106, a resistor R108, a capacitor C101, a capacitor C105, a transient suppression diode TV101 and a light-emitting diode LD1. Pin 1 of the dual-port charging controller chip U101, pin 2 of the dual-port charging controller chip U101 and the source of the MOS tube Q101 are connected to the output end of the second filtering circuit, pins 15 and 16 of the dual-port charging controller chip U101 are connected to pins A4, B9, A9 and B4 of the USB Type-C charging interface, pin 13 of the dual-port charging controller chip U101 is connected to pin A5 of the USB Type-C charging interface, pin 14 of the dual-port charging controller chip U101 is connected to pin B5 of the USB Type-C charging interface, and pin 11 of the dual-port charging controller chip U101 is connected to pin The A6 and B6 pins of the Type-C charging interface are connected, the 12th pin of the dual-port charging controller chip U101 is connected to the A7 and B7 pins of the USB Type-C charging interface, the 9th pin of the dual-port charging controller chip U101 is connected to the 3rd pin of the USB Type-A charging interface, the 10th pin of the dual-port charging controller chip U101 is connected to the 2nd pin of the USB Type-A charging interface, the 6th pin of the dual-port charging controller chip U101 is connected to the 4th, 5th and 6th pins of the USB Type-A charging interface, the 7th pin of the dual-port charging controller chip U101 is connected to the gate of the MOS tube Q101, the 8th pin of the dual-port charging controller chip U101 is connected to the drain of the MOS tube Q101, and the drain of the MOS tube Q101 is connected to the USB Pin 1 of the Type-A charging interface is connected, resistor R103, capacitor C101 and transient suppression diode TV101 are connected in parallel to the output end of the second filtering circuit, resistor R108 and light emitting diode LD1 are connected in series and connected in parallel with transient suppression diode TV101, one end of resistor R104 is connected to the output end of the second filtering circuit, the other end of resistor R104 is connected to the signal ground through resistor R105, the connection point between resistor R104 and resistor R105 is connected to pin 4 of the dual-port charging controller chip U101, pin 4 of the dual-port charging controller chip U101 is connected to pin 3 of the dual-port charging controller chip U101 through capacitor C105 and resistor R106, and pin 3 of the dual-port charging controller chip U101 is connected to the power management chip.

6. The combined gallium nitride fast charging device according to claim 5, characterized in that: The charging control module also includes an isolation circuit, which includes an optocoupler U3, a resistor R7 and a resistor R8. Pin 1 of the optocoupler U3 is connected to the output end of the second filter circuit through the resistor R7, pin 2 of the optocoupler U3 is connected to pin 3 of the dual-port charging controller chip U101, resistor R8 is connected between pin 1 of the optocoupler U3 and pin 2 of the optocoupler U3, pin 4 of the optocoupler U3 is connected to the power management chip, and pin 3 of the optocoupler U3 is grounded.

7. The combined gallium nitride fast charging device according to claim 1, characterized in that: The power management chip adopts a chip with model number DK035G. The auxiliary power supply circuit includes a transistor Q1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C2, a capacitor C3, a capacitor C8, a capacitor C9, a diode D2 and a voltage-stabilizing diode ZD1. One end of the resistor R3 is connected to the secondary winding of the switching transformer, and the other end of the resistor R3 is grounded through the resistor R4. The connection point between the resistor R3 and the resistor R4 is connected to the pin 1 of the power management chip. The anode of the diode D2 is connected to the secondary winding of the switching transformer. The cathode of the diode D2 is connected to the collector of the transistor Q1, the base of the transistor Q1 is connected to the cathode of the Zener diode ZD1, the anode of the Zener diode ZD1 is grounded, the emitter of the transistor Q1 is connected to pin 3 of the power management chip, the emitter of the transistor Q1 is grounded through the capacitor C8, the collector of the transistor Q1 is grounded through the capacitor C3, the resistor R5 is connected between the collector of the transistor Q1 and the base of the transistor Q1, the capacitor C9 is connected in parallel with the Zener diode ZD1, and the resistor R2 is connected in series with the capacitor C2 and then connected in parallel with the diode D2.

8. The combined gallium nitride fast charging device according to claim 1, characterized in that: The charging control module also includes a peak absorption circuit, which is connected in parallel with the primary coil of the switching transformer.

9. The combined gallium nitride fast charging device according to any one of claims 1 to 8, characterized in that: The input side of the rectifier module is connected with an EMI circuit, a lightning protection circuit, a surge protection circuit and an overcurrent protection circuit in sequence from near to far.

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