CN216817222U

CN216817222U - Controllable multi-port repeater based on CH552

Info

Publication number: CN216817222U
Application number: CN202220731053.0U
Authority: CN
Inventors: 黎俊杰
Original assignee: Chengdu Zhanwei Electromechanical Automation Co ltd
Current assignee: Chengdu Zhanwei Electromechanical Automation Co ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2022-06-24
Anticipated expiration: 2032-03-31

Abstract

The utility model provides a CH 552-based controllable multi-port repeater which comprises a power supply module, a CH552 control module, an insertion identification module, a HUB module and a relay module, wherein the power supply module is respectively connected with the CH552 control module, the HUB module and the insertion identification module, the CH552 control module is respectively connected with the insertion identification module, the HUB module and the relay module, the HUB module is connected with the relay module, the relay module is connected with a USB output module, and the USB output module is respectively connected with a plurality of devices. The utility model can simulate the actual USB plug and unplug, solves the problem that the equipment needs manual plug and unplug when the multiport transponder is disconnected, programs one or more channels, and can reconnect after the equipment is interrupted by program control, thereby reducing the plug and unplug times of the multiport transponder and the equipment and reducing the risk of equipment damage.

Description

Controllable multi-port repeater based on CH552

Technical Field

The utility model relates to the field of control circuits, in particular to a controllable multi-port repeater based on CH 552.

Background

In the field of industrial automation control, a plurality of devices are needed to realize automation control, the devices need to use a multi-port repeater for signal communication, when the multi-port repeater has only one interface but needs to be connected with a plurality of devices, the multi-port repeater is needed to divide one interface into a plurality of interfaces to ensure the normal operation of the automation devices, but when the multi-port repeater is used for connecting the devices, the devices need to be manually plugged and unplugged to be connected or disconnected with the multi-port repeater, communication jamming is very easy to cause in the manual plugging and unplugging process, and the devices are damaged.

Disclosure of Invention

In view of the above problems, the present invention provides a CH552 based controllable multiport repeater.

The utility model is realized by the following technical scheme:

the utility model provides a based on controllable multiport repeater of CH552, includes power module, CH552 control module, inserts identification module, HUB module and relay module, power module connects CH552 control module, HUB module respectively, inserts identification module, CH552 control module connects respectively and inserts identification module, HUB module and relay module, the relay module is connected to the HUB module, USB output module is connected to the relay module, a plurality of equipment are connected respectively to the USB output module.

Further, the power module includes an MP1584EN buck conversion chip U4, wherein a pin 7 of the buck conversion chip U4 is connected to one end of an inductor L2, one end of a capacitor C4, and one end of a capacitor C14, the other end of the inductor L2 is connected to one end of a resistor R34, the other end of the resistor R34 is connected to a power connection end, a pin 6 of the buck conversion chip U4 is connected to one end of a capacitor R16, the other end of the capacitor R16 is connected to the other end of a capacitor C14, the other end of the capacitor C4, a pin 5 of the buck conversion chip U4, one end of a resistor R17, one end of a resistor R21, the other end of the resistor R17 is connected to one end of a capacitor C7, the other end of the capacitor C7 is connected to a pin 3 of the buck conversion chip U4, a pin 8 of the buck conversion chip U4 is connected to one end of a capacitor C6, the other end of the capacitor C6 is connected to the other end of the buck conversion chip U4, the other end of the capacitor C3857 is connected to a pin 1 of the buck conversion chip U4, a cathode of a schottky diode D, one end of a cathode of a schottky diode D3882, one end of a schottky diode L1, and an anode of the schottky diode D4 is connected to one end of the capacitor C9, the other end of the capacitor C9 is connected with the other end of the inductor L1, one end of the resistor R14 and one end of the resistor R18 respectively, the other end of the resistor R14 is connected with one end of the resistor R20, and the other end of the resistor R20 is connected with the 4-pin of the buck conversion chip U4 and the other end of the resistor R21 respectively.

Further, the CH552 control module includes a CH552 single chip microcomputer U2, a pin 2 of the CH552 single chip microcomputer U2 is connected to an anode of the LED1, a cathode of the LED1 is connected to one end of a resistor R29, the other end of the resistor R29 is connected to one end of a resistor R19, the other end of the resistor R19 is connected to a cathode of the LED2, an anode of the LED2 is connected to the other end of the resistor R18, the other end of the CH552 single chip microcomputer U2, one end of a capacitor C8, and one end of a switch SW 8, the other end of the switch SW 8 is connected to one end of a resistor R8, the other end of the resistor R8 is connected to one end of the resistor R8, and a pin 12 of the CH552 single chip microcomputer U8, a pin 13 of the CH552 single chip microcomputer U8 is connected to one end of the resistor R8, and the other end of the capacitor C8 is connected to one end of the pin 8, one end of the resistor C8, one end of the single chip microcomputer 8 is connected to a pin 6859 of the CH 552U 8.

Further, the plug-in recognition module includes a triode Q5, the collector of the triode Q5 is connected with the other end of the resistor R26, the base of the triode Q5 is connected with one end of the resistor R33, the other end of the resistor R33 is connected with one end of the resistor R28, the drain of the MOS transistor Q4, the gate of the MOS transistor Q4 is connected with one end of the resistor R27, the source of the MOS transistor Q4 is connected with one end of the resistor R32, the other end of the resistor R32 is connected with the other end of the resistor R27, and the module is used for detecting whether the USB1 in the HUB module is plugged in.

Further, the HUB module comprises a HUB chip U1, the HUB chip U1 has 16 pins, pin 7 of the HUB chip U1 is connected to the other end of the resistor R5, pin 8 of the HUB chip U1 is connected to the other end of the resistor R4, pin 15 and pin 16 of the HUB chip U1 are connected to two ends of the crystal oscillator X1 respectively, pin 14 of the HUB chip U1 is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to one end of the capacitor C2, the other end of the capacitor C2 is connected to pin 13 of the HUB chip U1, pin 11 of the HUB chip U1 is connected to one end of the resistor 12 and one end of the capacitor C3 respectively, the other end of the resistor R12 is connected to pin 1 of the USB-B connector USB1 and the other end of the resistor R27 respectively, the other end of the capacitor C3 is connected to pin 4 of the USB-B connector USB1 and one end of the resistor R3, the other end of the USB-B interface 3 is connected to the USB 3, and the other end of the capacitor 3 is connected to the HUB 3 of the USB 3, the other end of the capacitor R22 is connected with a pin 3 of a USB-B connector USB1, a pin 9 of the HUB chip U1 is connected with one end of a capacitor R23, the other end of the capacitor R23 is connected with a pin 2 of the USB-B connector USB1, after the USB1 is connected with the HUB chip U1, the USB1 generates a signal and sends the signal to the MOS tube Q4 to enable the MOS tube Q4 to be conducted, the MOS tube Q4 is conducted and then drives the triode Q5 to be conducted, 5V voltage provided by a power supply circuit in the triode Q5 is transmitted to a pin 9 of the CH552 singlechip U2, and the CH552 completes identification and confirms the access of the USB 1.

Further, the relay module comprises 3 relay branches with the same structure, wherein the first relay branch comprises HFD4/12-S relay K1 and HFD4/12-S relay K2, 8 pins of the relay K1 are respectively connected with 8 pins of the relay K2 and one end of a resistor R35, 1 pin of the relay K1 is respectively connected with a cathode of a freewheeling diode D1, 1 pin of the relay K2 and the second relay branch, the other end of the resistor R35 of the relay K2 is connected with a drain of a MOS transistor Q1, a source of the MOS transistor Q1 is connected with one end of a resistor R7, a gate of the MOS transistor Q1 is connected with one end of a resistor R1, the other end of the resistor R1 is respectively connected with the other end of a resistor R7 and a 5 pin of a CH single chip 552U 2, a 2 pin of the relay K1 is connected with a 5 pin of a HUB chip U1, and a 7 pin of the relay K1 is connected with a 6 pin of the HUB chip U1.

Further, the USB interface device further comprises a USB output module, the USB output module comprises a USB connector USB2, pin 1 of the USB connector USB2 is connected with one end of an anode of the light emitting diode D6 and one end of a capacitor C10 respectively, the anode of the light emitting diode D6 is connected with one end of a capacitor R13, the other end of the capacitor R13 is connected with the other end of a capacitor C10, a pin 4 of the USB connector USB2 and one end of a capacitor R15 respectively, the other end of the capacitor R15 is connected with the USB connector USB2, a pin 2 of the USB connector USB2 is connected with a pin 3 of the electrical appliance K1, and a pin 3 of the USB connector USB2 is connected with a pin 6 of the electrical appliance K1.

Furthermore, there are 3 USB output modules, and 3 USB output modules connect 3 relay branch circuits respectively.

The utility model has the beneficial effects that:

the utility model can simulate the actual USB plug and unplug, solves the problem that the equipment needs manual plug and unplug when the multiport transponder is disconnected, programs one or more channels, and can reconnect after the equipment is interrupted by program control, thereby reducing the plug and unplug times of the multiport transponder and the equipment and reducing the risk of equipment damage.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a block diagram of a circuit structure of a CH 552-based controllable multi-port repeater according to the present invention;

fig. 2 is a first schematic circuit diagram of a CH552 controllable multi-port based repeater according to the present invention;

fig. 3 is a second schematic circuit diagram of a CH552 controllable multi-port based repeater according to the present invention;

fig. 4 is a third schematic circuit diagram of a CH 552-based controllable multi-port repeater according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

Example 1

Referring to fig. 1, a CH 552-based controllable multi-port repeater, includes a housing and a PCB board, the PCB is arranged in the shell, a power supply module, a CH552 control module, an insertion identification module, a HUB module and a relay module are arranged on the PCB, the power module is respectively connected with the CH552 control module and the HUB module, the CH552 control module is respectively connected with the insertion identification module, the HUB module and the relay module, the HUB module is connected with the relay module, the relay module is connected with the USB output module, the USB output module is respectively connected with a plurality of devices, the power supply module adopts a 12-5V voltage conversion chip, the model of the chip is MP1584EN-LF-Z, the CH552 control module adopts a CH552G chip, the entry module adopts an SL2.1A chip, and the relay model adopted by the relay module is HFD 4/12-S.

Example 2

Referring to fig. 2 to fig. 4, this embodiment proposes a circuit structure diagram of a CH 552-based controllable multi-port repeater based on embodiment 1.

The power module comprises a voltage reduction conversion chip U4, wherein a pin 7 of the voltage reduction conversion chip U4 is respectively connected with one end of an inductor L2, one end of a capacitor C4 and one end of a capacitor C14, the other end of the inductor L2 is connected with one end of a resistor R34, the other end of the resistor R34 is connected with a power access end, a pin 6 of the voltage reduction conversion chip U4 is connected with one end of a capacitor R16, the other end of the capacitor R16 is respectively connected with the other end of a capacitor C14, the other end of the capacitor C4, a pin 5 of a voltage reduction conversion chip U4, one end of a resistor R17 and one end of a resistor R21, the other end of the resistor R17 is connected with one end of a capacitor C7, the other end of the capacitor C7 is connected with a pin 3 of the voltage reduction conversion chip U4, a pin 8 of the voltage reduction conversion chip U4 is connected with one end of the capacitor C6, the other end of the capacitor C6 is respectively connected with a pin 1 of the voltage reduction conversion chip U4, a cathode of a Schottky diode D4 and one end of an inductor L1, and an anode of a Schottky diode D4 is connected with one end of a capacitor C9, the other end of the capacitor C9 is connected with the other end of the inductor L1, one end of the resistor R14 and one end of the resistor R18 respectively, the other end of the resistor R14 is connected with one end of the resistor R20, the other end of the resistor R20 is connected with the 4 pins of the buck conversion chip U4 and the other end of the resistor R21 respectively, and when the power supply access end is externally connected with a 12V power supply, the 5V power supply is output after passing through the buck conversion chip U4.

The CH552 control module comprises a CH552 singlechip U2, wherein a pin 2 of a CH552 singlechip U2 is connected with the anode of a light emitting diode LED1, the cathode of the light emitting diode LED1 is connected with one end of a resistor R29, the other end of the resistor R29 is connected with one end of a resistor R19, the other end of the resistor R19 is connected with the cathode of a light emitting diode LED2, the anode of the light emitting diode LED2 is respectively connected with the other end of the resistor R18, a pin 15 of a CH552 singlechip U2, one end of a capacitor C8 and one end of a switch SW2, the other end of the switch SW2 is connected with one end of a resistor R10, the other end of the resistor R10 is respectively connected with one end of a resistor R38, one end of a resistor R4 and a pin 12 of a CH 552U 2, a pin 13 of the CH552 singlechip U2 is connected with one end of a resistor R5, the other end of the capacitor C8 is respectively connected with one end of a resistor R9, one end of a capacitor C5, the other end of a capacitor C5 is connected with a pin 16 of a CH 552U 2, the other end of a singlechip R26 is connected with a pin 26, the other end of a USB 552 singlechip U2, wherein the pin is configured as a bidirectional channel pin 26, the power output end of the power supply module is connected with a pin 15 of the CH552 control module, pins 12 and 13 are D + and D-signal ends of the USB equipment, a pin 16 is output of the internal USB power supply regulator and input of the internal USB power supply, and the power supply voltage provided by the power supply module is 5V, so that the power supply decoupling capacitor of 0.1 muF is externally connected.

The plug-in identification module comprises a triode Q5, the collector connecting resistor R26 other end of triode Q5, the base connecting resistor R33 one end of triode Q5, the other end connecting resistor R28 one end of resistor R33, the drain electrode of MOS pipe Q4, MOS pipe Q4's grid connecting resistor R27 one end, MOS pipe Q4's source connecting resistor R32 one end, the other end connecting resistor R27 other end of resistor R32, triode Q5 also connects the 9 pins at CH552 control module simultaneously, the 9 pins are used for detecting the USB voltage input of access, whether insert successfully for detecting the USB interface on the HUB module.

The relay module comprises 3 relay branches with the same structure, wherein the first relay branch comprises HFD4/12-S relay K1 and HFD4/12-S relay K2, pins 8 of relay K1 are respectively connected with pins 8 of relay K2 and one end of a resistor R35, pin 1 of relay K1 is respectively connected with the cathode of a freewheeling diode D1, pin 1 of relay K2 and the second relay branch, the other end of pin 8 resistor R35 of relay K2 is connected with the drain of a MOS tube Q1, the source of MOS tube Q1 is connected with one end of a resistor R7, the gate of MOS tube Q1 is connected with one end of a resistor R1, the other end of resistor R1 is respectively connected with the other end of a resistor R7 and a pin 5 of a CH 552U 2, pin 2 of relay K1 is connected with a pin 5 of a HUB chip U1, pin 7 of relay K1 is connected with a pin 6 of the HUB chip U1, the source of each MOS tube arranged on each relay branch is connected with a CH552 single chip, the CH552 single chip microcomputer sends a control signal to control the conduction of the MOS tube so as to control the connection and disconnection of the USB output module.

The HUB module comprises a HUB chip U1, the HUB chip U1 is provided with 16 pins, a pin 7 of the HUB chip U1 is connected with the other end of a resistor R5, a pin 8 of the HUB chip U1 is connected with the other end of a resistor R4, pins 15 and 16 of the HUB chip U1 are respectively connected with two ends of a crystal oscillator X1, a pin 14 of the HUB chip U1 is connected with one end of a capacitor C1, the other end of the capacitor C1 is connected with one end of a capacitor C2, the other end of the capacitor C2 is connected with a pin 13 of the HUB chip U1, a pin 11 of the HUB chip U1 is respectively connected with one end of a resistor 12 and one end of a capacitor C3, the other end of a resistor R12 is respectively connected with a pin 1 of a USB-B connector USB1 and the other end of a resistor R27, the other end of a capacitor C27 is respectively connected with a pin 4 of a USB-B connector USB 27, one end of a resistor R27 is connected with a USB-B interface, the other end of the resistor R27 is connected with a USB-B connector U-27, and the other end of the USB-B connector is connected with a USB 27, the 9 pins of HUB chip U1 connect electric capacity R23 one end, and USB-B connector USB 1's 2 pins are connected to the electric capacity R23 other end, and wherein HUB chip U1's 5, 6 pins connect relay module's first relay branch road, and relay module's second relay branch road is connected to 3, 4 pins, and relay module's third relay branch road is connected to 1, 2 pins.

The USB output module comprises a USB connector USB2, wherein a pin 1 of the USB connector USB2 is connected with an anode of a light-emitting diode D6 and one end of a capacitor C10 respectively, the anode of the light-emitting diode D6 is connected with one end of a capacitor R13, the other end of the capacitor R13 is connected with the other end of a capacitor C10 respectively, the other end of a 4-pin of the USB connector USB2 and one end of a capacitor R15 respectively, the other end of the capacitor R15 is connected with a USB connector USB2, a pin 2 of the USB connector USB2 is connected with a pin 3 of an electric appliance K1, and a pin 3 of the USB connector USB2 is connected with a pin 6 of the electric appliance K1.

Example 3

This embodiment proposes an implementation manner of a CH 552-based controllable multi-port repeater on the basis of embodiment 1.

Further, the embodiment is as follows:

2-4, the relay module simulates the plugging and unplugging of the USB output module, the control module U2 is connected to the USB2 through the hub U1, the pin 5 of the control module U2 is used to send a control signal to the USB2, when the pin 5 of the control module U2 does not output a signal or is at a low level, the MOS transistor Q1 of the relay module is not turned on, the normally closed contacts of the relay K1 and the relay K2 are communicated, the USB2 is connected to the hub U1, when the pin 5 of the control module U2 outputs a high level, the MOS transistor Q1 of the relay module is turned on, the coils of the relay K1 and the relay K2 are powered, the normally closed contacts of the relay K1 and the relay K2 are disconnected, after the pin 5 of the control module U2 is pulled low, the digital signal is restored to 1, which is equivalent to the plugging and unplugging of the plug on the USB2, that is a technical scheme without manual plugging and unplugging the USB2 is implemented.

The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof.

It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a controllable multiport repeater based on CH552 which characterized in that, includes power module, CH552 control module, inserts identification module, HUB module and relay module, power module connects CH552 control module, HUB module respectively, inserts identification module, CH552 control module connects respectively and inserts identification module, HUB module and relay module, the relay module is connected to the HUB module, USB output module is connected to the relay module, a plurality of equipment are connected respectively to the USB output module.

2. The CH 552-based controllable multiport repeater according to claim 1, wherein the power module comprises an MP1584EN buck conversion chip U4, wherein pins 7 of the buck conversion chip U4 are respectively connected to one end of an inductor L2, one end of a capacitor C4 and one end of a capacitor C14, the other end of the inductor L2 is connected to one end of a resistor R34 and the other end of a resistor R34 are connected to the power input end, pin 6 of the buck conversion chip U4 is connected to one end of a capacitor R16, the other end of the capacitor R16 is respectively connected to the other end of a capacitor C14, the other end of the capacitor C4, pin 5 of the buck conversion chip U4, one end of a resistor R17 and one end of a resistor R21, the other end of the resistor R17 is connected to one end of a capacitor C7, the other end of a capacitor C7 is connected to pin 3 of the buck conversion chip U4, pin 8 of the buck conversion chip U4 is connected to one end of a capacitor C6, and the other end of the capacitor C6 is respectively connected to pin 1 of the buck conversion chip U4 and the cathode of a Schottky diode D4, Inductor L1 one end, schottky diode D4's positive pole is connected capacitor C9 one end, and the other end of capacitor C9 is connected the other end of inductor L1 respectively, resistance R14 one end, resistance R18 one end, and the resistance R14 other end is connected resistance R20 one end, and the 4 pins of step-down conversion chip U4, the resistance R21 other end are connected respectively to the resistance R20 other end.

3. The CH552 controllable multiport repeater as claimed in claim 1, wherein the CH552 control module comprises a CH552 single chip microcomputer U2, a pin 2 of the CH552 single chip microcomputer U2 is connected with an anode of a light emitting diode LED1, a cathode of the light emitting diode LED1 is connected with one end of a resistor R29, the other end of the resistor R29 is connected with one end of a resistor R19, the other end of a resistor R19 is connected with a cathode of a light emitting diode LED2, an anode of the light emitting diode LED2 is respectively connected with the other end of a resistor R18, a pin 15 of the CH552 single chip microcomputer U2, one end of a capacitor C8, one end of a switch SW2, the other end of the switch SW2 is connected with one end of a resistor R10, the other end of the resistor R10 is respectively connected with one end of a resistor R38, one end of a resistor R4, a pin 12 of the CH552 single chip microcomputer U4, a pin 13 of the CH 552U 4 is connected with one end of a resistor R4, the other end of the capacitor C4 is respectively connected with a pin 68516 of the single chip microcomputer 4, the other end of the resistor R26 is connected with a pin 9 of a CH552 singlechip U2.

4. The CH 552-based controllable multiport repeater according to claim 1, wherein the insertion identification module comprises a transistor Q5, the collector of the transistor Q5 is connected with the other end of the resistor R26, the base of the transistor Q5 is connected with one end of the resistor R33, the other end of the resistor R33 is connected with one end of the resistor R28 and the drain of the MOS transistor Q4, the gate of the MOS transistor Q4 is connected with one end of the resistor R27, the source of the MOS transistor Q4 is connected with one end of the resistor R32, and the other end of the resistor R32 is connected with the other end of the resistor R27.

5. The CH 552-based controllable multiport transponder according to claim 1, wherein said HUB module comprises a HUB chip U1, said HUB chip U1 has 16 pins, said HUB chip U1 has 7 pins connected to the other end of the resistor R5, said HUB chip U1 has 8 pins connected to the other end of the resistor R4, HUB chip U1 has 15 pins and 16 pins connected to the two ends of the crystal oscillator X1, HUB chip U1 has 14 pins connected to one end of the capacitor C1, capacitor C1 has the other end connected to one end of the capacitor C2, capacitor C2 has the other end connected to the 13 pin of the HUB chip U1, HUB chip U1 has 11 pins connected to one end of the resistor 12 and one end of the capacitor C3, resistor R12 has the other end connected to the 1 pin of the USB-B connector USB1 and the other end of the resistor R27, capacitor C3 has the other end connected to one end of the USB-B connector USB 364 pin and the other end of the resistor R3 and the other end of the USB 38B 3, a pin 10 of the HUB chip U1 is connected with one end of a capacitor R22, the other end of the capacitor R22 is connected with a pin 3 of a USB-B connector USB1, a pin 9 of the HUB chip U1 is connected with one end of a capacitor R23, and the other end of the capacitor R23 is connected with a pin 2 of a USB-B connector USB 1.

6. The CH552 controllable multiport repeater according to claim 1, wherein the relay module comprises 3 relay branches with the same structure, wherein the first relay branch comprises HFD4/12-S relay K1 and HFD4/12-S relay K2, 8 pins of relay K1 are respectively connected with 8 pins of relay K2 and one end of resistor R35, 1 pin of relay K1 is respectively connected with a cathode of freewheeling diode D1, 1 pin of relay K2 and the second relay branch, the other end of resistor R35 of relay K2 is connected with a drain of MOS transistor Q1, a source of MOS transistor Q1 is connected with one end of resistor R7, a gate of MOS transistor Q1 is connected with one end of resistor R1, the other end of resistor R1 is respectively connected with the other end of resistor R7 and the other end of CH 552U 2, and the 2 pin of relay K1 is connected with the 5 pin of HUB chip U1, the 7 pin of the relay K1 is connected to the 6 pin of the HUB chip U1.

7. The CH 552-based controllable multi-port repeater according to claim 1, further comprising a USB output module, wherein the USB output module comprises a USB connector USB2, pins 1 of the USB connector USB2 are respectively connected with an anode of a light emitting diode D6 and one end of a capacitor C10, an anode of the light emitting diode D6 is connected with one end of a capacitor R13, the other end of the capacitor R13 is respectively connected with the other end of a capacitor C10, pins 4 of the USB connector USB2 and one end of a capacitor R15, the other end of the capacitor R15 is connected with a USB connector USB2, pins 2 of the USB connector USB2 are connected with pins 3 of an electrical appliance K1, and pins 3 of the USB connector USB2 are connected with pins 6 of the electrical appliance K1.

8. The CH552 based controllable multi-port repeater according to claim 7, wherein there are 3 USB output modules, and 3 USB output modules are connected to 3 relay branches.