USB socket and circuit thereof
By using circuit designs such as rectifier filter modules and transformer T1 in the USB socket, the problem of equipment damage caused by current fluctuations during charging is solved, and the stability and safety of output power are achieved.
Patent Information
- Application Number
- CN202420271216.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-02
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-02-02
AI Technical Summary
USB sockets are prone to current fluctuations when charging, resulting in damage to the device and unstable output power.
The circuit design of the rectifying filter module, transformer T1, secondary filter module, control and protection module, feedback module and protocol chip U5 is adopted to keep the output power within the rated range by sampling and adjusting the output voltage.
It effectively reduces the probability of damage to the charging device, improves the stability of output power during charging, and reduces current fluctuations.
Smart Images
Figure CN222637837U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of sockets, and in particular to a USB socket and a circuit thereof. Background Art
[0002] As mobile devices such as mobile phones and pads are becoming more and more popular, and if this kind of mobile device needs a socket to charge, it is often necessary to insert the charging head into the socket, and then use a USB cable to electrically connect the USB port of the charging head to the USB port or Type-c port of the mobile device to achieve charging.
[0003] Therefore, sockets with USB holes are gradually becoming popular, that is, USB sockets, and USB sockets are often equipped with normal two-pin and three-pin sockets, which makes the USB sockets have current fluctuations when charging. For example, when too many devices are plugged in, if current fluctuations occur and the power exceeds the rated power, the charging device may be damaged easily, and the socket will stop outputting and cannot charge the device normally. Utility Model Content
[0004] In order to improve the problem that current fluctuations in a USB socket during charging may cause damage to the device, the present application provides a USB socket and a circuit thereof.
[0005] The present application provides a USB socket circuit, which adopts the following technical solution:
[0006] A USB socket circuit, comprising:
[0007] The rectifier and filter module is used to rectify and filter the AC power input and then output a DC voltage;
[0008] Transformer T1, used for stepping down the DC voltage output by the rectifier and filter module and then outputting it;
[0009] A secondary filtering module, used for filtering the output of the transformer T1 and then outputting it;
[0010] A control and protection module, used for sampling the output through the transformer T1 to obtain a sampling signal, and adjusting the voltage output by the rectification and filtering module (1) through the transformer T1 according to the sampling signal;
[0011] A feedback module, used for sampling the output voltage of the secondary filter module to obtain a voltage signal, and controlling and changing the transformer T1 through the control and protection module (3) according to the voltage signal to adjust the output voltage;
[0012] The protocol chip U5 is used to receive the output of the secondary filter module, and is matched with the protocol chip U5 through an external device, so that the output voltage and current are output through the USB.
[0013] By adopting the above technical solution, the output is sampled through the control and protection module, and the voltage is adjusted when the current is too high, so that the output power is maintained at the rated power, the probability of damage to the charging equipment is reduced, the stability of the output power during charging is improved, and the fluctuation is reduced.
[0014] Optionally, the rectification and filtering module includes an L end, an N end, a fuse F1, and a rectification and filtering unit, the L end and the N end are used to receive power input, the fuse F1 is electrically connected to the L end for overcurrent protection, the input end of the rectification and filtering unit receives the power input of the L end and the N end, the rectification and filtering unit is used to rectify and filter the power input and then output it, and the output end of the rectification and filtering unit is electrically connected to the fourth and third pins of the transformer T1.
[0015] By adopting the above technical solution, the power input is rectified and filtered to improve the input stability, and is protected by the fuse F1.
[0016] Optionally, the rectification and filtering module includes a capacitor CY1, one end of the capacitor CY1 is electrically connected to a strong current ground terminal, and the other end of the capacitor CY1 is electrically connected to a weak current ground terminal.
[0017] By adopting the above technical solution, the common ground of the strong current grounding and the weak current grounding is achieved through the capacitor CY1.
[0018] Optionally, the control and protection module includes a chip U1, a diode D2, and a capacitor C4, the positive electrode of the diode D2 is electrically connected to the first pin of the transformer T1, the negative electrode of the diode D2 is electrically connected to the second pin of the chip U1 for power supply, the capacitor C4 is electrically connected between the negative electrode of the diode D2 and the ground terminal, and the first pin and the third pin of the transformer T1 are the same-name terminals.
[0019] By adopting the above technical solution, the power supply to the chip U1 is realized and the stability of the power supply is improved.
[0020] Optionally, the control and protection module includes a capacitor C11, and the fifth pin, the sixth pin, the seventh pin, and the eighth pin of the chip U1 are connected in parallel to the third pin of the transformer T1 for switching frequency control. The capacitor C11 is connected in parallel between the fifth pin and the third pin of the chip U1, and draws power through the third pin of the chip U1. The chip U1 controls the switching frequency of the fifth pin, the sixth pin, the seventh pin, and the eighth pin according to the level of the third pin.
[0021] By adopting the above technical solution, power is taken through the third pin of the chip U1, and the switching frequency is adjusted through the fifth pin, the sixth pin, the seventh pin, and the eighth pin to adjust the output voltage.
[0022] Optionally, the secondary filtering module includes a chip U2, a capacitor C7, a resistor R9, a capacitor C10, a resistor R10, a capacitor C6, and a resistor R4. The first pin, the second pin, the third pin, and the fourth pin of the chip U2 are connected in parallel to the B pin of the transformer T1. The fifth pin, the sixth pin, the seventh pin, and the eighth pin of the chip U2 are connected in parallel to the A pin of the transformer T1. The B pin and the third pin of the transformer T1 are the same-name terminals. The capacitor C10 and the resistor R10 are connected in parallel between the third pin and the fourth pin of the chip U2. The resistor R4 and the capacitor C6 are connected in parallel between the first pin and the eighth pin of the chip U2. The capacitor C7 and the resistor R9 are connected in parallel between the A pin of the transformer T1 and the fifth pin of the chip U2. The fifth pin, the sixth pin, the seventh pin, and the eighth pin of the chip U2 are connected in parallel as the output end of the secondary filtering module.
[0023] By adopting the above technical solution, the output voltage is filtered and rectified again before being output for charging, that is, after the chip U1 adjusts the output voltage, the adjusted voltage is rectified and filtered, thereby further improving the stability of the output voltage.
[0024] Optionally, the feedback module includes an optocoupler isolator U4, a resistor R5, a resistor R6, and a diode U3, the resistor R5 is connected in parallel to the output end of the secondary filtering module, the resistor R6 is connected in series between the negative electrode of the diode U3 and the resistor R5, the input end of the optocoupler isolator U4 is electrically connected between the resistor R5 and the resistor R6, the output end of the optocoupler isolator U4 is electrically connected to the fourth pin of the chip U1, and the chip U1 controls the switching frequency of the fifth pin, the sixth pin, the seventh pin, and the eighth pin through the level of the fourth pin.
[0025] By adopting the above technical solution, when the output voltage is too high, it is detected through the third pin of the chip U1 and adjusted accordingly, thereby playing a protective role.
[0026] Optionally, it includes a charging terminal USB1, the output end of the secondary filtering module is electrically connected to the fifth pin of the protocol chip U5 and the first pin of the charging terminal USB1, the second pin of the protocol chip U5 is grounded, the sixth pin of the protocol chip U5 is electrically connected to the second pin of the charging terminal USB1, and the first pin of the protocol chip U5 is electrically connected to the third pin of the charging terminal USB1.
[0027] By adopting the above technical solution, the power supply voltage of the charging terminal USB1 is adjusted, so that when the current of the charging device fluctuates, the voltage can be adaptively adjusted to keep the power unchanged and improve the stability.
[0028] Optionally, it includes a Type-C charging end, which includes a power supply port VCC, a signal port CC2CC1, a data port D+ D-, and a ground port GND. The power supply port VCC and the signal port CC2 CC1 are electrically connected to the fifth pin and the second pin of the protocol chip U5, and the data port D+ D- is electrically connected to the third pin and the fourth pin of the protocol chip U5.
[0029] By adopting the above technical solution, the power supply voltage of the Type-C charging terminal is adjusted, so that when the current of the charging device fluctuates, the voltage can be adaptively adjusted to keep the power unchanged and improve stability.
[0030] The present application provides a USB socket, which adopts the following technical solution:
[0031] A USB socket comprises an insert plate and a shell, wherein the insert plate is provided with a USB hole for inserting a USB end and charging and a Type-C hole for inserting a Type-C end and charging, and a circuit board for current and voltage processing is arranged in the shell.
[0032] By adopting the above technical solution, the socket has a USB port and a Type-C port, thereby expanding the range of charging adapter devices.
[0033] In summary, the present application includes at least one of the following beneficial technical effects:
[0034] 1. When the current is too high, the voltage is adjusted to keep the output power at the rated power, reducing the probability of damage to the charging equipment, improving the stability of the output power during charging, and reducing fluctuations.
[0035] 2. After the chip U1 adjusts the output voltage, the adjusted voltage is rectified and filtered to further improve the stability of the output voltage. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] Figure 1 It is a schematic diagram of an overall module of a USB socket circuit in an embodiment of the present application.
[0037] Figure 2 It is the circuit diagram of the protocol chip.
[0038] Figure 3 It is the circuit diagram of the control and protection module.
[0039] Figure 4 It is a schematic diagram of the overall structure of a USB socket in an embodiment of the present application.
[0040] Figure 5 It is a schematic diagram highlighting the exploded structure of the circuit board.
[0041] Explanation of the accompanying drawings: 1. Rectification and filtering module; 2. Secondary filtering module; 3. Control and protection module; 4. Feedback module; 5. Plug-in board; 51. Shell; 52. USB port; 53. Type-C port; 54. Circuit board. DETAILED DESCRIPTION
[0042] The following is combined with Figure 1-5 This application is described in further detail.
[0043] The present application embodiment discloses a USB socket circuit. Figure 1 and Figure 2 and Figure 3 The USB socket circuit includes a rectifier filter module 1, a secondary filter module 2, a control and protection module 3, a feedback module 4, a transformer T1, and a protocol chip U5.
[0044] Reference Figure 3 The rectifier and filter module 1 is used to rectify and filter the AC power input and output DC high voltage. The rectifier and filter module 1 includes an L terminal, an N terminal, a fuse F1, and a rectifier and filter unit. The L terminal and the N terminal are used for power input. The L terminal is electrically connected to the fuse F1. The L terminal and the N terminal are electrically connected to the input terminal of the rectifier and filter unit. The output terminal of the rectifier and filter unit is electrically connected to the third and fourth pins of the transformer T1. The rectifier and filter unit is used to rectify and filter the AC power input and output DC high voltage. The rectifier and filter unit can be composed of, for example, a rectifier bridge, a capacitor, an inductor, and a resistor. It can also be replaced by other components or circuits with rectification and filtering functions. In this embodiment, the fuse F1 can be of the MTS 2A / 250V model. After receiving the high-voltage DC input of the rectifier and filter module 1, the transformer T1 steps down the voltage and outputs it.
[0045] Reference Figure 3 One end of capacitor CY1 is electrically connected to the strong current grounding terminal, and the other end of capacitor CY1 is electrically connected to the weak current grounding terminal. In this embodiment, the strong current grounding terminal is the grounding terminal of 220V power supply or 380V power supply, and the weak current grounding terminal is the grounding terminal of signal and data. In this embodiment, capacitor CY1 can adopt a model with parameter of 2200P / AC400V.
[0046] Reference Figure 3The control and protection module 3 includes a chip U1, a diode D2, a capacitor C4, a capacitor C11, and a resistor R3. The positive electrode of the diode D2 is electrically connected to the first pin of the transformer T1, the second pin of the transformer T1 is grounded, the negative electrode of the diode D2 is electrically connected to the second pin of the chip U1 for power supply, the positive electrode of the capacitor C4 is electrically connected to the negative electrode of the diode D2, the negative electrode of the capacitor C4 is grounded, and the first pin and the third pin of the transformer T1 are the same-name terminals. In this embodiment, the capacitor C4 is a polar capacitor, the chip U1 is an ACDC chip, and the chip U1 can adopt the JCP87 model.
[0047] Reference Figure 3 The fifth pin, the sixth pin, the seventh pin and the eighth pin of the chip U1 are connected in parallel to the third pin of the transformer T1, one end of the resistor R3 is electrically connected to the third pin of the chip U1, the other end of the resistor R3 is grounded, one end of the capacitor C11 is connected in parallel to the fifth pin of the chip U1, the other end of the capacitor C11 is connected in parallel between the third pin of the chip U1 and the resistor R3, and power is taken through the third pin of the chip U1. The chip U1 controls the switching frequency of the fifth pin, the sixth pin, the seventh pin and the eighth pin according to the level of the third pin, and controls the waveform frequency of the third and fourth pins of the transformer T1 through the switching frequency of the fifth pin, the sixth pin, the seventh pin and the eighth pin, thereby controlling the voltage of the A pin and the B pin of the transformer T1. For example, the sampling signal sampled by the third pin is 2.2A, and the preset current threshold in the chip U1 is 2A, the power threshold is 10W, and the sampling signal is greater than the current threshold 2.2>2. At this time, the calculated voltage should be less than 10 / 2.2=4.5V, so that the output voltage of the A pin and the B pin of the transformer T1 is less than or equal to 4.5V through the switching frequency of the fifth pin, the sixth pin, the seventh pin, and the eighth pin.
[0048] Reference Figure 3The secondary filter module 2 includes a chip U2, a capacitor C7, a resistor R9, a capacitor C10, a resistor R10, a capacitor C6, and a resistor R4. The first pin, the second pin, the third pin, and the fourth pin of the chip U2 are connected in parallel to the B pin of the transformer T1. The fifth pin, the sixth pin, the seventh pin, and the eighth pin of the chip U2 are connected in parallel to the A pin of the transformer T1. The B pin and the third pin of the transformer T1 are the same-named terminals. The capacitor C10 and the resistor R10 are connected in parallel between the third pin and the fourth pin of the chip U2. One end of the resistor R4 is connected in parallel to the first pin of the chip U2. The other end of the resistor R4 is connected in parallel to the One end is electrically connected to one end of capacitor C6, the other end of capacitor C6 is connected in parallel to the eighth pin of chip U2, the positive electrode of capacitor C7 is connected in parallel to the fifth pin of chip U2, the negative electrode of capacitor C7 is connected in parallel to the A pin of transformer T1, resistor R9 is connected in parallel between the A pin of transformer T1 and the fifth pin of chip U2, and the negative electrode of capacitor C7 is grounded between the A pin of transformer T1, the fifth pin, the sixth pin, the seventh pin, and the eighth pin of chip U2 are connected in parallel as the output end of secondary filter module 2, and the output end is used as the output of VCC / 5V, i.e., the 5V voltage after rectification and filtering. In the present embodiment, capacitor C7 and capacitor C8 are polar capacitors, and chip U2 can adopt JCP86 model. Secondary filter module 2 filters the low voltage output by transformer T1 to obtain low-voltage direct current.
[0049] Reference Figure 3The feedback module 4 includes an optocoupler isolator U4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C9, a capacitor C5, and a diode U3. One end of the resistor R5 is connected in parallel with one end of the resistor R7 and is electrically connected to VCC / 5V. The resistor R8 is connected in series between the other end of the resistor R7 and the ground terminal. One end of the resistor R6 is electrically connected to the other end of the resistor R5. One end of the capacitor C9 is electrically connected to the other end of the resistor R6. The other end of the capacitor C9 is connected in parallel between the resistor R7 and the resistor R8. The optocoupler isolator U4 The positive electrode of the light-emitting diode at the input end of the optocoupler isolator U4 (i.e., pin 1 of the optocoupler isolator U4) is connected in parallel between the resistor R5 and the resistor R6, the negative electrode of the light-emitting diode at the input end of the optocoupler isolator U4 (i.e., pin 2 of the optocoupler isolator U4) is connected in parallel between the resistor R6 and the capacitor C9, the negative electrode of the diode U3 is electrically connected between the resistor R6 and the negative electrode of the light-emitting diode at the input end of the optocoupler isolator U4, the positive electrode of the diode U3 is connected in parallel between the resistor R8 and the ground end, and the control end of the diode U3 is electrically connected between the resistor R7 and the resistor R8. One end of the output end of the optocoupler isolator U4 (i.e., pin 4 of the optocoupler isolator U4) is electrically connected to the fourth pin of the chip U1, the other end of the output end of the optocoupler isolator U4 (i.e., pin 3 of the optocoupler isolator U4) is grounded, and the capacitor C5 is connected in parallel to both ends of the output end of the optocoupler isolator U4. The resistor R5 and the resistor R6 form a voltage-dividing resistor group. When the voltage divided by the resistor R5 and the resistor R6 exceeds the threshold, the optocoupler isolator U4 is turned on, causing the level of the fourth pin of the chip U1 to change. The chip U1 controls the switching frequencies of the fifth pin, the sixth pin, the seventh pin, and the eighth pin through the level of the fourth pin. In this embodiment, the diode U3 can adopt the model with parameters of 431, 3 / K, 1 / REF, 2 / A, and the optocoupler isolator U4 can adopt the model 817C.
[0050] Reference Figure 2, also includes a charging terminal USB1, a Type-C charging terminal, a capacitor C11, a capacitor C12, a resistor R12, a resistor R13, a terminal 1, a terminal 2, and a +5V power supply terminal, VCC / 5V is used as terminal 1 for input, terminal 2 is used as GND for grounding, terminal 1 is electrically connected to the fifth pin IN of the protocol chip U5 and the first pin VDD of the charging terminal USB1, the second pin GND of the protocol chip U5 is electrically connected to terminal 2, the capacitor C11 is connected in parallel between terminal 1 and terminal 2, the positive electrode of the capacitor C12 is connected in parallel to terminal 1, the negative electrode of the capacitor C12 is connected in parallel to terminal 2, the sixth pin DM1 of the protocol chip U5 is electrically connected to the second pin D- of the charging terminal USB1, the +5V power supply terminal is electrically connected between terminal 1 and the fifth pin IN of the protocol chip U5, the first pin DP1 of the protocol chip U5 is electrically connected to the third pin D+ of the charging terminal USB1, and the fourth pin GND of the charging terminal USB1 is grounded. The charging terminal USB1 is powered by VCC / 5V, and the chip U1 also adaptively adjusts the power supply voltage of the charging terminal USB1. In this embodiment, the capacitor C12 is an electrolytic capacitor, the protocol chip U5 can use the UL4050 model, and the charging terminal USB1 can use the Type-A model.
[0051] Reference Figure 2 The Type-C charging end includes a power supply port VCC, a signal port CC2 CC1, a data port D+ D-, and a ground port GND. The first pin and the second pin of the power supply port VCC are electrically connected to end 1, the resistor R13 is electrically connected between the CC2 port of the signal port CC2 CC1 and end 1, the resistor R12 is electrically connected between the CC1 port of the signal port CC2 CC1 and end 1, the first pin of the data port D+ D- is electrically connected to the fourth pin DM2 of the protocol chip U5, the second pin of the data port D+ D- is electrically connected to the third pin DP2 of the protocol chip U5, and the ground port GND is grounded.
[0052] The implementation principle of a USB socket circuit in an embodiment of the present application is: when the output current is too large, the sampling signal collected through the third pin of the chip U1 is too large. At this time, the output voltage will be reduced through the fifth pin, the sixth pin, the seventh pin, and the eighth pin of the chip U1 so that the power remains at the rated power.
[0053] The present application embodiment discloses a USB socket. Figure 4 and Figure 5The USB socket includes a plug board 5 and a housing 51. The plug board 5 is covered on the housing 51. The plug board 5 is provided with a USB hole 52 for inserting and charging the USB end and a Type-C hole 53 for inserting and charging the Type-C end. The Type-C hole 53 is the Type-C charging end, and the USB hole 52 is the charging end USB1. A circuit board 54 for current and voltage processing is installed in the housing 51. The circuit board 54 is electrically connected to the plug board 5 through a wire to realize power supply. The plug board 5 can also be provided with two or three sockets.
[0054] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A USB socket circuit, characterized in that: include: A rectifier and filter module (1) is used to rectify and filter the AC power input and then output a DC voltage; Transformer T1, used for stepping down the DC voltage output by the rectifying and filtering module (1) for output; A secondary filtering module (2), used for filtering the output of the transformer T1 and then outputting it; A control and protection module (3) is used to sample the output through the transformer T1 to obtain a sampling signal, and adjust the voltage output by the rectifier and filter module (1) through the transformer T1 according to the sampling signal; A feedback module (4) is used to sample the output voltage of the secondary filter module (2) to obtain a voltage signal, and to control and change the transformer T1 through the control and protection module (3) according to the voltage signal, so as to adjust the output voltage; The protocol chip U5 is used to receive the output of the secondary filter module (2), and is matched with the protocol chip U5 through an external device, so that the output voltage and current are output through the USB.
2. A USB socket circuit according to claim 1, characterized in that: The rectification and filtering module (1) comprises an L terminal, an N terminal, a fuse F1, and a rectification and filtering unit. The L terminal and the N terminal are used to receive power input. The fuse F1 is electrically connected to the L terminal for overcurrent protection. The input end of the rectification and filtering unit receives the power input of the L terminal and the N terminal. The rectification and filtering unit is used to rectify and filter the power input and then output it. The output end of the rectification and filtering unit is electrically connected to the fourth pin and the third pin of the transformer T1.
3. A USB socket circuit according to claim 1, characterized in that: The rectification and filtering module (1) comprises a capacitor CY1, one end of the capacitor CY1 is electrically connected to a strong current grounding terminal, and the other end of the capacitor CY1 is electrically connected to a weak current grounding terminal.
4. A USB socket circuit according to claim 1, characterized in that: The control and protection module (3) comprises a chip U1, a diode D2, and a capacitor C4. The positive electrode of the diode D2 is electrically connected to the first pin of the transformer T1, the negative electrode of the diode D2 is electrically connected to the second pin of the chip U1 for power supply, the capacitor C4 is electrically connected between the negative electrode of the diode D2 and the ground terminal, and the first pin and the third pin of the transformer T1 are the same-name terminals.
5. A USB socket circuit according to claim 4, characterized in that: The control and protection module (3) comprises a capacitor C11. The fifth pin, the sixth pin, the seventh pin and the eighth pin of the chip U1 are connected in parallel to the third pin of the transformer T1 to control the switching frequency. The capacitor C11 is connected in parallel between the fifth pin and the third pin of the chip U1 and is powered through the third pin of the chip U1. The chip U1 controls the switching frequencies of the fifth pin, the sixth pin, the seventh pin and the eighth pin according to the level of the third pin.
6. A USB socket circuit according to claim 1, characterized in that: The secondary filtering module (2) comprises a chip U2, a capacitor C7, a resistor R9, a capacitor C10, a resistor R10, a capacitor C6, and a resistor R4. The first pin, the second pin, the third pin, and the fourth pin of the chip U2 are connected in parallel to the B pin of the transformer T1. The fifth pin, the sixth pin, the seventh pin, and the eighth pin of the chip U2 are connected in parallel to the A pin of the transformer T1. The B pin and the third pin of the transformer T1 are the same-name terminals. The capacitor C10 and the resistor R10 are connected in parallel between the third pin and the fourth pin of the chip U2. The resistor R4 and the capacitor C6 are connected in parallel between the first pin and the eighth pin of the chip U2. The capacitor C7 and the resistor R9 are connected in parallel between the A pin of the transformer T1 and the fifth pin of the chip U2. The fifth pin, the sixth pin, the seventh pin, and the eighth pin of the chip U2 are connected in parallel as the output end of the secondary filtering module (2).
7. A USB socket circuit according to claim 5, characterized in that: The feedback module (4) comprises an optocoupler isolator U4, a resistor R5, a resistor R6, and a diode U3, wherein the resistor R5 is connected in parallel to the output end of the secondary filter module (2), the resistor R6 is connected in series between the cathode of the diode U3 and the resistor R5, the input end of the optocoupler isolator U4 is electrically connected between the resistor R5 and the resistor R6, the output end of the optocoupler isolator U4 is electrically connected to the fourth pin of the chip U1, and the chip U1 controls the switching frequencies of the fifth pin, the sixth pin, the seventh pin, and the eighth pin through the level of the fourth pin.
8. The USB socket circuit according to claim 1, characterized in that: It comprises a charging terminal USB1, the output end of the secondary filter module (2) is electrically connected to the fifth pin of the protocol chip U5 and the first pin of the charging terminal USB1, the second pin of the protocol chip U5 is grounded, the sixth pin of the protocol chip U5 is electrically connected to the second pin of the charging terminal USB1, and the first pin of the protocol chip U5 is electrically connected to the third pin of the charging terminal USB1.
9. A USB socket circuit according to claim 8, characterized in that: It includes a Type-C charging end, which includes a power supply port VCC, a signal port CC2 CC1, a data port D+ D-, and a ground port GND. The power supply port VCC and the signal port CC2 CC1 are electrically connected to the fifth pin and the second pin of the protocol chip U5, and the data port D+ D- is electrically connected to the third pin and the fourth pin of the protocol chip U5.
10. A USB socket, according to any one of claims 1 to 9, characterized in that: The device comprises a plug board (5) and a shell (51); the plug board (5) is provided with a USB hole (52) for a USB terminal to be inserted and charged, and a Type-C hole (53) for a Type-C terminal to be inserted and charged; and a circuit board (54) for current and voltage processing is arranged inside the shell (51).