CN107124170B

CN107124170B - USB high-speed signal on-off control circuit

Info

Publication number: CN107124170B
Application number: CN201710287540.6A
Authority: CN
Inventors: 谈红贤
Original assignee: Bozhon Precision Industry Technology Co Ltd
Current assignee: Bozhon Precision Industry Technology Co Ltd
Priority date: 2017-04-27
Filing date: 2017-04-27
Publication date: 2020-05-12
Anticipated expiration: 2037-04-27
Also published as: CN107124170A

Abstract

The invention discloses a USB high-speed signal on-off control circuit, comprising: MCU controller, drive control circuit, USB signal control circuit and power supply circuit. The invention utilizes the application of the high-speed electronic analog switch U4 in USB signal communication, controls the drive control circuit through the microcontroller MCU to drive the P-channel MOSFET and the high-speed electronic analog switch U4 so as to control the on-off of the USB power supply VBUS and the on-off of the USB signal D +/D-, and realizes the signal control in the communication process with a test product through the probe TP.

Description

USB high-speed signal on-off control circuit

The technical field is as follows:

the invention belongs to the technical field of control circuits, and particularly relates to a USB high-speed signal on-off control circuit.

Background art:

USB (Universal Serial Bus) is an external Bus standard for standardizing the connection and communication between a computer and external devices, and is an interface technology applied in the field of PCs to support the plug and play and hot plug functions of devices.

With the more and more obvious superiority of the USB technology, more and more devices supporting the USB technology are provided, the USB technology is fully applied to modern industrial application fields, signal control in the communication process of the probe TP and a test product can be realized through USB signal communication, but the existing signal control circuit often has the defects of complex design, unstable performance, high cost and the like.

The invention content is as follows:

therefore, the technical problem to be solved by the invention is that in the prior art, a signal control circuit used in the communication process of a probe and a test product is complex in design, unstable in performance and high in cost, so that a USB high-speed signal on-off control circuit is provided.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a USB high-speed signal on-off control circuit comprises:

and the MCU controller is used for outputting a first control signal and a second control signal.

And the drive control circuit is used for outputting a first drive control signal and a second drive control signal, and two control input ends of the drive control circuit are respectively connected with two output ends of the MCU controller.

And the USB signal control circuit is used for controlling signals in the communication process of the probe and the test product, and two input ends of the USB signal control circuit are respectively connected with two output ends of the drive control circuit.

The power supply circuit, power supply circuit is used for exporting first mains voltage and second mains voltage, power supply circuit includes first step-down circuit and second step-down circuit, first step-down circuit's voltage output part respectively with the voltage end of MCU controller the voltage end of drive control circuit is connected, second step-down circuit's voltage input part with first step-down circuit's voltage output part is connected, second step-down circuit's voltage output part with USB signal control circuit's voltage end is connected.

Preferably, the MCU controller includes an MCU control chip JP1,

pins

21 and 22 of the MCU control chip JP1 are both the first control signal output terminal SCL1, and

pins

23 and 24 of the MCU control chip JP1 are both the second control signal output terminal SDA 1.

Pin 1 of the MCU control chip JP1 is connected to the first end of the fourth patch capacitor CP4, the second end of the patch capacitor CP4 is grounded, pin 1 of the MCU control chip JP1 is further connected to +24V,

pins

17, 18, 19, and 20 of the MCU control chip are respectively connected to VCC, and

pins

25, 26, 27, 28, 29, and 30 of the MCU control chip are respectively grounded.

Preferably, the drive control unit includes a drive control chip U3, the 5 pin of the drive control chip U3 is a first drive control signal output terminal SW _ USB _1, the 12 pin of the drive control chip U3 is a second drive control signal output terminal SW _ ON _1, and the first drive control signal output terminal SW _ USB _1 is divided by a seventh resistor R7 and an eighth resistor R8 to obtain a third drive control signal output terminal SW _ EN _ 1.

First control signal output terminal SCL1 is connected to drive control chip U3's 14 feet, second control signal output terminal SDA1 is connected to drive control chip U3's 15 feet, connect the VCC behind sixth resistance R6 is connected to first control signal output terminal SCL1, connect the VCC behind second control signal output terminal SDA1 connection ninth resistance R9.

VCC is connected to drive control chip U3's 1 foot, 2 feet and 3 feet ground connection of drive control chip U3, VCC is connected respectively after fourth resistance R4 to 4 feet, 5 feet, 6 feet, 7 feet of drive control chip U3, 8 feet ground connection of drive control chip U3, VCC is connected respectively after fifth resistance R5 is established ties respectively to 9 feet, 10 feet, 11 feet, 12 feet of drive control chip U3, VCC is connected to 16 feet of drive control chip U3, ground connection behind sixth electric capacity C6 is connected to 16 feet of drive control chip U3.

Preferably, the drive control chip U3 is a drive control chip of PCA 9554A.

Preferably, the ninth resistor R7 is a 39K/0805/1% resistor, and the tenth resistor R8 is a 68K/0805/1% resistor.

Preferably, the USB signal control circuit includes a MOSFET driver U5, a high-speed electronic analog switch U4, and a USB interface CON 1.

The 4 pins of the MOSFET driver U5 are connected to the second driving control signal output terminal SW _ ON _1, the 1 pin, the 2 pin and the 3 pin of the MOSFET driver U5 are respectively connected to the 1 pin of the USB interface CON1, the 5 pins, the 6 pins, the 7 pins and the 8 pins of the MOSFET driver U5 are respectively connected to the first end of the fifth capacitor C5, the second end of the fifth capacitor C5 is grounded, the first end of the fifth capacitor C5 is further connected to the first power signal control terminal TP4, and the first power signal control terminal TP1 is grounded.

The pin9 of the high-speed electronic analog switch U4 is connected to the third driving control signal output terminal SW _ EN _1, the

pins

1 and 5 of the high-speed electronic analog switch U4 are grounded respectively, the pin 2 of the high-speed electronic analog switch U4 is connected to the pin 3 of the UCB interface CON1, the pin 8 of the high-speed electronic analog switch U4 is connected to the pin 2 of the USB interface CON1, the pin 6 of the high-speed electronic analog switch U4 is connected to the first signal data control terminal TP2, the pin 5 of the high-speed electronic analog switch U4 is connected to the second signal data control terminal TP3, and the pin 10 of the high-speed electronic analog switch U4 is connected to the VCC 1.

The pin4, the pin 5, and the pin 6 of the USB interface CON1 are grounded, respectively.

Preferably, the MOSFET driver U5 selects a P-channel MOSFET, and the high-speed electronic analog switch U4 selects a high-speed electronic analog switch of the type FSUSB30 MUX/MSOP-10.

Preferably, the first voltage-reducing circuit includes a constant-voltage power supply chip J1 and a first voltage-stabilizing chip U2.

The pin 1 of the constant voltage source chip J1 is grounded, the pin 2 of the constant voltage source chip J1 outputs +24V voltage, the pin 2 of the constant voltage source chip J1 is connected with the anode of a second diode D2, the cathode of the second diode D2 is connected with the first end of a second capacitor C2, the second end of the second capacitor C2 is grounded, and the first capacitor C1 and the second capacitor C2 are connected in parallel.

A pin 1 of the first voltage stabilizing chip U2 is connected with a negative electrode of the second diode D2,

pins

3 and 5 of the first voltage stabilizing chip U2 are grounded respectively, a pin4 of the first voltage stabilizing chip U2 is connected with a first end of a first resistor R1, a second end of the first resistor R1 is grounded, a pin 2 of the first voltage stabilizing chip U2 is connected with a negative electrode of a third diode D3, an anode of the third diode D3 is grounded, a first end of an inductor L1 is connected with a negative electrode of a third diode D3, a second end of an inductor L1 is connected with a first lower terminal of an adjustable positioner R2, a second lower terminal of the adjustable positioner R2 is connected with a pin4 of the first voltage stabilizing chip U2, an upper terminal of the adjustable positioner R2 is connected with a first end of the first resistor R1, a first end of a third capacitor C3 is connected with a second terminal of the inductor L1, a third end of a third capacitor C5, a second end of the third capacitor C5857324 and a fourth capacitor C57324 are connected in parallel with the third capacitor, a first end of the third resistor R3 is connected to a first end of the third capacitor C3, a second end of the third resistor R3 is connected to an anode of the first light emitting diode D1, a cathode of the first light emitting diode D1 is grounded, a first end of the fuse F1 is connected to a first end of the sixth capacitor, and a second end of the fuse F1 is connected to the first output voltage VCC.

Preferably, in the above technical solution, the second voltage-reducing circuit includes a second voltage-stabilizing chip U1.

The pin 1 of the second voltage stabilization chip U1 is grounded, the pin 2 of the second voltage stabilization chip U1 outputs a second output voltage VCC1, the pin 3 of the second voltage stabilization chip U1 is connected to the first output voltage VCC, the first end of the second chip capacitor CP2 is connected to the first output voltage VCC, the second end of the second chip capacitor CP2 is grounded, the first end of the third chip capacitor CP3 is connected to the pin 2 of the second voltage stabilization chip U1, the second end of the third chip capacitor CP3 is grounded, the first chip capacitor CP1 is connected in parallel with the third chip capacitor CP3, the positive electrode of the second light emitting diode D4 is connected to the pin 2 of the second voltage stabilization chip U1, the negative electrode of the second light emitting diode D4 is connected to the first end of the potentiometer RP1, and the second end of the potentiometer RP1 is grounded.

Preferably, the first voltage stabilizing chip U2 is a voltage reduction type switch voltage stabilization power controller with the model of LM2576-ADJ, and the second voltage stabilizing chip U1 is a low-dropout linear voltage regulator with the model of LM1117 MPX-3.3.

Preferably, in the above technical solution, the first output voltage VCC is +5V, and the second output voltage VCC1 is + 3.3V.

The invention has the beneficial effects that: the invention utilizes the application of the high-speed electronic analog switch U4 in USB signal communication, controls the drive control circuit through the microcontroller MCU to drive the P-channel MOSFET and the high-speed electronic analog switch U4 so as to control the on-off of the USB power supply VBUS and the on-off of the USB signal D +/D-, and realizes the signal control in the communication process with a test product through the probe TP.

Description of the drawings:

the drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:

FIG. 1 is a schematic diagram of an MCU controller connection according to an embodiment of the present invention;

FIG. 2 is a diagram of a driving control circuit according to an embodiment of the present invention;

FIG. 3 is a circuit diagram of a USB signal control circuit according to an embodiment of the present invention;

FIG. 4 is a diagram of a first voltage reduction circuit in the power circuit according to one embodiment of the invention;

FIG. 5 is a diagram of a second voltage reduction circuit in the power circuit according to an embodiment of the invention;

fig. 6 is a truth table of the high-speed electronic analog switch U4 according to an embodiment of the present invention.

The specific implementation mode is as follows:

the invention discloses a USB high-speed signal on-off control circuit, which comprises:

As shown in fig. 1, the MCU controller includes an MCU control chip JP1,

pins

21 and 22 of the MCU control chip JP1 are both a first control signal output terminal SCL1, and

pins

23 and 24 of the MCU control chip JP1 are both a second control signal output terminal SDA 1.

pins

25, 26, 27, 28, 29, and 30 of the MCU control chip are respectively grounded.

As shown in fig. 2, the driving control unit includes a driving control chip U3, and the driving control chip U3 is a driving control chip with a model number of PCA 9554A. The pin 5 of the drive control chip U3 is a first drive control signal output terminal SW _ USB _1, the pin 12 of the drive control chip U3 is a second drive control signal output terminal SW _ ON _1, and the first drive control signal output terminal SW _ USB _1 is divided by a seventh resistor R7 and an eighth resistor R8 to obtain a third drive control signal output terminal SW _ EN _ 1. The ninth resistor R7 is a 39K/0805/1% resistor, and the tenth resistor R8 is a 68K/0805/1% resistor.

As shown in fig. 3, the USB signal control circuit includes a MOSFET driver U5, a high-speed electronic analog switch U4, and a USB interface CON 1. The MOSFET driver U5 selects a P-channel MOSFET, and the high-speed electronic analog switch U4 selects a high-speed electronic analog switch with the model of FSUSB30 MUX/MSOP-10.

The 4 pins of the MOSFET driver U5 are connected to the second driving control signal output terminal SW _ ON _1, the 1 pin, the 2 pin and the 3 pin of the MOSFET driver U5 are respectively connected to the 1 pin of the USB interface CON1, the 5 pins, the 6 pins, the 7 pins and the 8 pins of the MOSFET driver U5 are respectively connected to the first end of the fifth capacitor C5, the second end of the fifth capacitor C5 is grounded, the first end of the fifth capacitor C5 is further connected to the (USB) first power signal control terminal TP4(USB3_ VBUS _1), and the first power signal control terminal TP1 is grounded.

pins

1 and 5 of the high-speed electronic analog switch U4 are grounded, the pin 2 of the high-speed electronic analog switch U4 is connected to the pin 3 of the UCB interface CON1, the pin 8 of the high-speed electronic analog switch U4 is connected to the pin 2 of the USB interface CON1, the pin 6 of the high-speed electronic analog switch U4 is connected to the USB first signal data control terminal TP2(USB3_ HS _ DM), the pin 5 of the high-speed electronic analog switch U4 is connected to the USB second signal data control terminal TP3(USB3_ HS _ DP), and the pin 10 of the high-speed electronic analog switch U4 is connected to the VCC 1. TP1, TP2, TP3 and TP4 are probes connected to the USB signal end of the product.

As shown in fig. 4, the first voltage dropping circuit includes a constant voltage source chip J1 and a first voltage stabilization chip U2. The first voltage stabilization chip U2 selects a voltage reduction type switch voltage stabilization power supply controller with the model of LM 2576-ADJ.

A pin 1 of the first voltage stabilizing chip U2 is connected with a negative electrode of the second diode D2, pins 3 and 5 of the first voltage stabilizing chip U2 are grounded respectively, a pin4 of the first voltage stabilizing chip U2 is connected with a first end of a first resistor R1, a second end of the first resistor R1 is grounded, a pin 2 of the first voltage stabilizing chip U2 is connected with a negative electrode of a third diode D3, an anode of the third diode D3 is grounded, a first end of an inductor L1 is connected with a negative electrode of a third diode D3, a second end of an inductor L1 is connected with a first lower terminal of an adjustable positioner R2, a second lower terminal of the adjustable positioner R2 is connected with a pin4 of the first voltage stabilizing chip U2, an upper terminal of the adjustable positioner R2 is connected with a first end of the first resistor R1, a first end of a third capacitor C3 is connected with a second terminal of the inductor L1, a third end of a third capacitor C5, a second end of the third capacitor C5857324 and a fourth capacitor C57324 are connected in parallel with the third capacitor, a first end of the third resistor R3 is connected to a first end of the third capacitor C3, a second end of the third resistor R3 is connected to an anode of the first light emitting diode D1, a cathode of the first light emitting diode D1 is grounded, a first end of the fuse F1 is connected to a first end of the sixth capacitor, and a second end of the fuse F1 is connected to the first output voltage VCC. The first output voltage VCC is + 5V.

As shown in fig. 5, the second voltage-dropping circuit includes a second voltage-stabilizing chip U1. The second voltage stabilizing chip U1 selects a low-dropout linear voltage regulator with the model number of LM1117 MPX-3.3.

The 1 pin ground connection of second regulator chip U1, 2 pin output second output voltage VCC1 of second regulator chip U1, second output voltage VCC1 is + 3.3V. The 3 pin of the second voltage-stabilizing chip U1 is connected with a first output voltage VCC, the first end of the second patch capacitor CP2 is connected with the first output voltage VCC, the second end of the second patch capacitor CP2 is grounded, the first end of the third patch capacitor CP3 is connected with the 2 pin of the second voltage-stabilizing chip U1, the second end of the third patch capacitor CP3 is grounded, the first patch capacitor CP1 is connected with the third patch capacitor CP3 in parallel, the anode of the second light-emitting diode D4 is connected with the 2 pin of the second voltage-stabilizing chip U1, the cathode of the second light-emitting diode D4 is connected with the first end of a potentiometer RP1, and the second end of the potentiometer RP1 is grounded.

The working principle of the circuit is as follows:

in fig. 4 and 5, the +24V voltage is switched in through J1, and becomes VCC after being reduced by U2, then VCC becomes VCC1(3.3V regulated power supply) after being reduced by U1, and corresponding resistance-capacitance circuits R, C, a zener diode D, a corresponding power indication status LED, an inductor L, and an overcurrent fuse F are implanted to ensure the circuit stability.

In fig. 3, after the USB cable is plugged into the USB interface CON1, if the ON/off between CON1 and TP is to be controlled, the U4 is driven by the driving control circuit portion, and the U5 enters the working state, and when the network labels SW _ USB _1 and SW _ ON _1 in fig. 2 are high level 1, the U4 and U5 are not working, and the USB signal and TP are not communicatively connected, as shown in the truth table of U4 in fig. 6.

In FIG. 2, the initial output I/O (1-8) of U3 is high, as are SW _ USB _1 and SW _ ON _ 1. The U3 is controlled by the control signals SDA1 of the MCU and the IIC protocol of SCL1, so that SW _ USB _1 and SW _ ON _1 are controlled to be low level 0, at this time, the signal terminal SW _ ON _1 of the PIN4 of the U5 is low level, the G pole of U5 is triggered, U5 is a P-channel MOSFET, so that the U5 works and is conducted, and the power supply signal VCC of the USB signal is conducted to TP4(USB3_ VBUS). When SW _ USB _1 is at low level 0, the voltage division effect of R7 and R8 obtains that SW _ EN _1 is at low level signal 0, triggers PIN9(OE) signal end of U4, makes U4 enter into the working conducting state, and the D +/D-signal of USB is connected to product TP point through CON 1. Since the operating voltage of U4 is 3.3V and SW _ EN _1 is high, it cannot exceed 3.3V, so when SW _ USB _1 is high 5V, R7 divides voltage 5 × (39/68) to 2.86V <3.3V by R8.

The U3 type selection in fig. 2 must satisfy the low power consumption 2 channel high speed USB2.0(480Mbps) switch, because the D +/D-signal of USB is a high speed signal (480Mbps), the bad type selection may cause the communication interruption and the unstable situation occurs. The IIC signals SDA1 and SCL1 of U3 need to be connected with pull-up resistors R6 and R9 to create the necessary conditions for IIC communication.

The USB high-speed signal on-off control circuit described in this embodiment includes: MCU controller, drive control circuit, USB signal control circuit and power supply circuit. The invention utilizes the application of the high-speed electronic analog switch U4 in USB signal communication, controls the drive control circuit through the microcontroller MCU to drive the P-channel MOSFET and the high-speed electronic analog switch U4 so as to control the on-off of the USB power supply VBUS and the on-off of the USB signal D +/D-, and realizes the signal control in the communication process with a test product through the probe TP.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A USB high-speed signal on-off control circuit is characterized by comprising:

the MCU controller is used for outputting a first control signal and a second control signal;

the driving control circuit is used for outputting a first driving control signal and a second driving control signal, and two control input ends of the driving control circuit are respectively connected with two output ends of the MCU controller;

the USB signal control circuit is used for controlling signals in the communication process of the probe and the test product, and two input ends of the USB signal control circuit are respectively connected with two output ends of the drive control circuit;

the power supply circuit is used for outputting a first power supply voltage and a second power supply voltage, and comprises a first voltage reduction circuit and a second voltage reduction circuit, wherein the voltage output end of the first voltage reduction circuit is respectively connected with the voltage end of the MCU controller and the voltage end of the drive control circuit, the voltage input end of the second voltage reduction circuit is connected with the voltage output end of the first voltage reduction circuit, and the voltage output end of the second voltage reduction circuit is connected with the voltage end of the USB signal control circuit;

the MCU controller comprises an MCU control chip JP1, pins 21 and 22 of the MCU control chip JP1 are both a first control signal output end SCL1, and pins 23 and 24 of the MCU control chip JP1 are both a second control signal output end SDA 1;

a pin 1 of the MCU control chip JP1 is connected to a first end of a fourth patch capacitor CP4, a second end of the patch capacitor CP4 is grounded, a pin 1 of the MCU control chip JP1 is further connected to a voltage of +24V, pins 17, 18, 19 and 20 of the MCU control chip are respectively connected to VCC, and pins 25, 26, 27, 28, 29 and 30 of the MCU control chip are respectively grounded;

the drive control circuit comprises a drive control chip U3, wherein a pin 5 of the drive control chip U3 is a first drive control signal output end SW _ USB _1, a pin 12 of the drive control chip U3 is a second drive control signal output end SW _ ON _1, and the first drive control signal output end SW _ USB _1 is subjected to voltage division through a seventh resistor R7 and an eighth resistor R8 to obtain a third drive control signal output end SW _ EN _ 1;

a pin 14 of the driving control chip U3 is connected to a first control signal output terminal SCL1, a pin 15 of the driving control chip U3 is connected to a second control signal output terminal SDA1, the first control signal output terminal SCL1 is connected to a sixth resistor R6 and then connected to VCC, and the second control signal output terminal SDA1 is connected to a ninth resistor R9 and then connected to VCC;

2. The USB high-speed signal on-off control circuit according to claim 1, wherein: the drive control chip U3 is a drive control chip with model number PCA 9554A.

3. The USB high-speed signal on-off control circuit according to claim 1, wherein: the ninth resistor R7 is a 39K/0805/1% resistor, and the tenth resistor R8 is a 68K/0805/1% resistor.

4. The USB high-speed signal on-off control circuit according to claim 1, wherein:

the USB signal control circuit comprises a MOSFET driver U5, a high-speed electronic analog switch U4 and a USB interface CON 1;

the 4 pins of the MOSFET driver U5 are connected to the second driving control signal output terminal SW _ ON _1, the 1 pin, the 2 pin and the 3 pin of the MOSFET driver U5 are respectively connected to the 1 pin of the USB interface CON1, the 5 pins, the 6 pins, the 7 pins and the 8 pins of the MOSFET driver U5 are respectively connected to the first end of a fifth capacitor C5, the second end of the fifth capacitor C5 is grounded, the first end of the fifth capacitor C5 is further connected to a fourth power signal control terminal TP4, and the first power signal control terminal TP1 is grounded;

a pin9 of the high-speed electronic analog switch U4 is connected to the third drive control signal output terminal SW _ EN _1, pins 1 and 5 of the high-speed electronic analog switch U4 are grounded, a pin 2 of the high-speed electronic analog switch U4 is connected to a pin 3 of the USB interface CON1, a pin 8 of the high-speed electronic analog switch U4 is connected to a pin 2 of the USB interface CON1, a pin 6 of the high-speed electronic analog switch U4 is connected to the first signal data control terminal TP2, a pin 5 of the high-speed electronic analog switch U4 is connected to the second signal data control terminal TP3, and a pin 10 of the high-speed electronic analog switch U4 is connected to the VCC 1;

5. The USB high-speed signal on-off control circuit according to claim 1, wherein: the MOSFET driver U5 selects a P-channel MOSFET, and the high-speed electronic analog switch U4 selects a high-speed electronic analog switch of the type FSUSB30 MUX/MSOP-10.

6. The USB high-speed signal on-off control circuit according to claim 3, wherein:

the first voltage reduction circuit comprises a constant voltage source chip J1 and a first voltage stabilization chip U2;

the pin 1 of the constant voltage source chip J1 is grounded, the pin 2 of the constant voltage source chip J1 outputs a voltage of +24V, the pin 2 of the constant voltage source chip J1 is connected with the anode of a second diode D2, the cathode of the second diode D2 is connected with the first end of a second capacitor C2, the second end of the second capacitor C2 is grounded, and a first capacitor C1 is connected with the second capacitor C2 in parallel;

a pin 1 of the first voltage stabilizing chip U2 is connected with a negative electrode of the second diode D2, pins 3 and 5 of the first voltage stabilizing chip U2 are grounded respectively, a pin4 of the first voltage stabilizing chip U2 is connected with a first end of a first resistor R1, a second end of the first resistor R1 is grounded, a pin 2 of the first voltage stabilizing chip U2 is connected with a negative electrode of a third diode D3, an anode of the third diode D3 is grounded, a first end of an inductor L1 is connected with a negative electrode of a third diode D3, a second end of an inductor L1 is connected with a first lower terminal of an adjustable positioner R2, a second lower terminal of the adjustable positioner R2 is connected with a pin4 of the first voltage stabilizing chip U2, an upper terminal of the adjustable positioner R2 is connected with a first end of the first resistor R1, a first end of a third capacitor C3 is connected with a second terminal of the inductor L1, a third end of a third capacitor C5, a second end of the third capacitor C5857324 and a fourth capacitor C57324 are connected in parallel with the third capacitor, a first end of the third resistor R3 is connected to a first end of the third capacitor C3, a second end of the third resistor R3 is connected to an anode of the first light emitting diode D1, a cathode of the first light emitting diode D1 is grounded, a first end of the fuse F1 is connected to a first end of the third capacitor C3, and a second end of the fuse F1 outputs the first output voltage VCC.

7. The USB high-speed signal on-off control circuit according to claim 6, wherein:

the second voltage reduction circuit comprises a second voltage stabilization chip U1;

8. The USB high-speed signal on-off control circuit according to claim 7, wherein: the first voltage stabilizing chip U2 selects a voltage-reducing switch voltage-stabilizing power supply controller with the model of LM2576-ADJ, and the second voltage stabilizing chip U1 selects a low-dropout linear voltage regulator with the model of LM1117 MPX-3.3.

9. The USB high-speed signal on-off control circuit according to claim 7, wherein: the first output voltage VCC is +5V, and the second output voltage VCC1 is + 3.3V.