CN110768230A - Network interface protection circuit and terminal equipment - Google Patents

Network interface protection circuit and terminal equipment Download PDF

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Publication number
CN110768230A
CN110768230A CN201911387546.6A CN201911387546A CN110768230A CN 110768230 A CN110768230 A CN 110768230A CN 201911387546 A CN201911387546 A CN 201911387546A CN 110768230 A CN110768230 A CN 110768230A
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China
Prior art keywords
pin
network
capacitor
network interface
power supply
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CN201911387546.6A
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Chinese (zh)
Inventor
丁永波
宋长春
甘胜滨
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Shenzhen Weibu Information Co Ltd
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Shenzhen Weibu Information Co Ltd
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Priority to CN201911387546.6A priority Critical patent/CN110768230A/en
Publication of CN110768230A publication Critical patent/CN110768230A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/10—Current supply arrangements

Abstract

The embodiment of the invention discloses a network interface protection circuit and terminal equipment, which comprise a mainboard, wherein a network interface, a network chip and a network interface protection circuit are arranged on the mainboard; the network interface protection circuit converts a network signal output by the network chip into a network data signal and transmits the network data signal to the network interface, and also converts a network voltage into a working voltage and outputs the working voltage to the network chip for power supply and anti-surge and anti-static protection. The network interface protection circuit can also perform anti-surge and anti-static protection on instant abnormal voltage with higher level, so that the problem that the instant abnormal voltage is directly applied to the board end through the network interface to cause burning of the board end part can be solved.

Description

Network interface protection circuit and terminal equipment
Technical Field
The invention relates to the technical field of electronics, in particular to a network interface protection circuit and terminal equipment.
Background
Due to the development of modern technology, network technology is widely applied in various fields, computer network systems are applied in various fields, the integration level of network equipment is high, the overvoltage resistance is low, and the computer network systems are sensitive to lightning stroke electromagnetic pulse. The loss of computer network equipment caused by lightning strike and static electricity is difficult to estimate every year, so the design of the protection circuit of the computer network equipment becomes a great importance, the protection circuit is also the direction of research of various mainboard designers, and the requirements of stable performance and low cost are met.
The conventional network interface voltage protection circuit includes: the TVS tube is used for inhibiting (short time/low voltage/low current) instantaneous abnormal voltage and absorbing instantaneous high voltage, but the TVS tube has lower grade and can protect the TVS tube, the instantaneous abnormal voltage with higher grade (long time/high voltage/high current) cannot be effectively protected, and the instantaneous abnormal voltage is directly applied to a board end through a network interface to cause the burning of board end parts, can cause the burning of the whole system in severe cases, causes irreparable damage to a computer and causes severe economic loss to customers; and can not meet the requirements of some applications in higher environment.
Disclosure of Invention
In view of the above technical problems, embodiments of the present invention provide a network interface protection circuit and a terminal device, so as to solve the problem that a board end part is burnt down when an instantaneous abnormal voltage with a higher level is directly applied to a board end through a network interface.
The embodiment of the invention provides a network interface protection circuit, which is connected with a network interface and a network chip and comprises a protection module, a filtering module and a power supply module;
the protection module converts the network signal output by the network chip into a network data signal and transmits the network data signal to the network interface, and further performs anti-surge and anti-static protection; the filtering module filters, stabilizes and filters noise of the input voltage and outputs network voltage; the power supply module converts the network voltage into working voltage, stabilizes the working voltage and outputs the working voltage to the network chip for power supply;
the protection module comprises a network transformer, a first diode, a first resistor, a first capacitor, a second capacitor and a third capacitor;
the TD1+ pin, the TD 1-pin, the TD2+ pin, the TD 2-pin, the TD3+ pin, the TD 3-pin, the TD4+ pin and the TD 4-pin of the network transformer are connected with a network chip; the TCT1 pin of the network transformer is grounded through a second capacitor, and the TCT1 pin of the network transformer is also connected with the TCT2 pin, the TCT3 pin and the TCT4 pin of the network transformer; the TCT3 pin of the network transformer is grounded through a third capacitor, and the MX1+ pin, the MX 1-pin, the MX2+ pin, the MX 2-pin, the MX3+ pin, the MX 3-pin, the MX4+ pin and the MX 4-pin of the network transformer are connected with a network interface; the MCT1 pin of the network transformer is connected with the MCT2 pin, the MCT3 pin and the MCT4 pin of the network transformer; the MCT3 pin of the network transformer is also connected with one end of a first capacitor through a first resistor, and the MCT4 pin of the network transformer is also connected with the other end of the first capacitor and digital ground through a first diode.
Optionally, the protection module further comprises a first short-circuit point and a second short-circuit point;
the first short-circuit point is connected between digital ground and ground, and the second short-circuit point is connected between digital ground and ground.
Optionally, in the network interface protection circuit, the protection module further includes a first anti-static protection tube, a second anti-static protection tube, a fourth capacitor, and a fifth capacitor;
the pins I/O1, I/O2, I/O3 and I/O4 of the first anti-static protection tube are connected with the pins TD3-, TD4+, TD 4-and TD3+ of the network transformer in a one-to-one manner; the VCC pin of the first anti-static protection tube is connected with a network power supply end and one end of a fourth capacitor, and the other end of the fourth capacitor and the GND pin of the first anti-static protection tube are both grounded; the pins I/O1, I/O2, I/O3 and I/O4 of the second anti-static protection tube are connected with the pins TD2+, TD1+, TD 1-and TD 2-of the network transformer in a one-to-one manner; the VCC pin of the second anti-static protection tube is connected with the network power supply end and one end of the fifth capacitor, and the other end of the fifth capacitor and the GND pin of the second anti-static protection tube are both grounded.
Optionally, in the network interface protection circuit, the filtering module includes a sixth capacitor, a seventh capacitor, and an eighth capacitor;
one end of the sixth capacitor is connected with the power supply end, one end of the seventh capacitor, one end of the eighth capacitor and the network power supply end; the other end of the sixth capacitor, the other end of the seventh capacitor and the other end of the eighth capacitor are all grounded.
Optionally, in the network interface protection circuit, the power supply module includes an LDO voltage conversion chip, a second resistor, a third resistor, a ninth capacitor, and a tenth capacitor;
the VIN pin of the LDO voltage conversion chip is connected with one end of the second resistor and a network power supply end, the REF pin of the LDO voltage conversion chip is connected with one end of the ninth capacitor, the other end of the second resistor and one end of the third resistor, the other end of the ninth capacitor and the other end of the third resistor are all grounded, the VCNTL1 pin of the LDO voltage conversion chip, the VCNTL2 pin, the VCNTL3 pin and the VCNTL4 pin are connected with each other and connected with a reference power supply end, the VOUT pin of the LDO voltage conversion chip is connected with one end of the tenth capacitor and a chip power supply end of the network chip, the other end of the tenth capacitor is all grounded, and the GND0 pin and the GND1 pin of the LD.
Optionally, in the network interface protection circuit, the power supply module further includes an eleventh capacitor, a twelfth capacitor, and a thirteenth capacitor;
one end of the eleventh capacitor is connected with a VIN pin of the LDO voltage conversion chip and a network power supply end, one end of the twelfth capacitor is connected with a VCNTL1 pin of the LDO voltage conversion chip and a reference power supply end, and one end of the thirteenth capacitor is connected with one end of the tenth capacitor and a chip power supply end of the network chip; the other end of the eleventh capacitor, the other end of the twelfth capacitor and the other end of the thirteenth capacitor are all grounded.
Optionally, in the network interface protection circuit, the model of the network transformer is GSC-2418-R.
Optionally, in the network interface protection circuit, the first and second anti-static protection tubes are ESD _ AZC199-04S _ SOT 23-6.
A second aspect of the embodiments of the present invention provides a terminal device, including a motherboard, where the motherboard is provided with a network interface and a network chip, and is further provided with the network interface protection circuit;
the network interface protection circuit converts a network signal output by the network chip into a network data signal and transmits the network data signal to the network interface, and also converts a network voltage into a working voltage and outputs the working voltage to the network chip for power supply and anti-surge and anti-static protection.
In the technical scheme provided by the embodiment of the invention, the terminal equipment comprises a mainboard, wherein a network interface, a network chip and a network interface protection circuit are arranged on the mainboard; the network interface protection circuit converts a network signal output by the network chip into a network data signal and transmits the network data signal to the network interface, and also converts a network voltage into a working voltage and outputs the working voltage to the network chip for power supply and anti-surge and anti-static protection. The network interface protection circuit can also perform anti-surge and anti-static protection on instant abnormal voltage with higher level, so that the problem that the instant abnormal voltage is directly applied to the board end through the network interface to cause burning of the board end part can be solved.
Drawings
Fig. 1 is a block diagram of a terminal device according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a part of a protection module in a network interface protection circuit according to an embodiment of the present invention.
Fig. 3 is another circuit diagram of a protection module in a network interface protection circuit according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of a filtering module in a network interface protection circuit according to an embodiment of the present invention.
Fig. 5 is a circuit diagram of a power supply module in the network interface protection circuit according to the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The embodiments of the present invention, and all other embodiments obtained by those skilled in the art without any inventive step, belong to the protection scope of the present invention.
Referring to fig. 1, a terminal device according to an embodiment of the present invention includes a main board, where the main board is provided with a network interface protection circuit 10, a network interface 20, and a network chip 30; the network interface protection circuit 10 is connected to the network interface 20 and the network chip 30, the network interface protection circuit 10 converts a network signal output by the network chip 30 into a network data signal and transmits the network data signal to the network interface 20, and the network interface protection circuit 10 also converts a network voltage into a working voltage and outputs the working voltage to the network chip for power supply, and performs anti-surge and anti-static protection.
The network interface protection circuit can be applied to all terminal equipment with network interfaces, such as computers. The network interface 20 is a crystal header (a standardized telecommunication network interface).
The network interface protection circuit 10 comprises a protection module 100, a filtering module 200 and a power supply module 300; the filtering module 200 is connected with the protection module 100 and the power supply module 300, the protection module 100 is connected with the network interface 20, and the power supply module 300 is connected with the network chip 30; the protection module 100 converts a network signal output by the network chip into a network data signal and transmits the network data signal to a network interface, and performs anti-surge and anti-static protection; the filtering module 200 filters, stabilizes and filters noise of the input voltage, and outputs a network voltage; the power supply module 300 converts the network voltage into a working voltage, stabilizes the working voltage, and outputs the working voltage to the network chip for power supply.
Referring to fig. 2, the protection module 100 includes a network transformer T1, a first diode D1, a first resistor R1, a first capacitor C1, a second capacitor C2, and a third capacitor C3; the TD1+ pin, the TD 1-pin, the TD2+ pin, the TD 2-pin, the TD3+ pin, the TD 3-pin, the TD4+ pin and the TD 4-pin of the network transformer T1 are connected with the network chip 30; the TCT1 pin of the network transformer T1 is grounded through a second capacitor C2, and the TCT1 pin of the network transformer T1 is also connected with the TCT2 pin, the TCT3 pin and the TCT4 pin of the network transformer T1; the TCT3 pin of the network transformer T1 is also grounded through a third capacitor C3, and the MX1+ pin, the MX 1-pin, the MX2+ pin, the MX 2-pin, the MX3+ pin, the MX 3-pin, the MX4+ pin and the MX 4-pin of the network transformer T1 are all connected with the network interface 20; the MCT1 pin of the network transformer T1 is connected with the MCT2 pin, the MCT3 pin and the MCT4 pin of the network transformer T1; the MCT3 leg of network transformer T1 is also connected to one end of a first capacitor C1 through a first resistor R1, and the MCT4 leg of network transformer T1 is also connected to the other end of first capacitor C1 and to digital ground (i.e., ground like the inverted E-word shown in fig. 2) through a first diode D1.
The model of the network transformer T1 is preferably GSC-2418-R, 4 pairs of network signals (MDI 0 + -, MDI 1+ -, MDI 2+ -, MDI 3+ -) output by the network chip 30 are isolated (coupled, protected, high-frequency noise filtered) by the network transformer T1, and then 4 pairs of corresponding network data signals (D0 + -, D1+ -, D2+ -, D3+ are output, and the 4 pairs of network data signals are output through a network interface. Numerically in fig. 2 by the inverted E word and analogically by the 3 side-by-side and successively shorter lines, all other grounds being analogically (board-end grounds) except numerically specifically indicated in the text.
In the specific implementation, 4 resistors can be reserved, and when a certain network interface only needs two pairs of network data signals, the MX1+ pin, the MX 1-pin, the MX2+ pin and the MX 2-pin of the network transformer T1 can be respectively connected with the MCT1 pin of the network transformer T1 through one resistor, so that the two pairs of network data signals (D2 +/-and D3 +/-) are removed.
The first diode D1 is a TVS tube, and the MCT1-4 pin of the network transformer T1 is an anti-static protection pin and works together with D1, C1 and R1. When the instantaneous abnormal voltage occurs, the instantaneous high voltage can be restrained from reaching the GND through the first diode D1, so that the board-end device is protected from being damaged by the voltage, and the effect of preventing the surge voltage is achieved. The first resistor R1 and the first capacitor C1 form an RC filter circuit, and when instantaneous abnormal voltage occurs, instantaneous high voltage can be restrained from reaching GND, so that a plate end device is protected from being damaged by voltage, and the effect of preventing surge voltage protection is further enhanced.
The second capacitor C2 and the third capacitor C3 are used for filtering high frequency noise, and can better protect the stability of other signals (such as the voltage signal inside the V _ DAC and the network transformer T1, which plays a role of filtering through the second capacitor C2) of the network interface.
Preferably, in order that the protection module 100 further includes a first short-circuit point short _ a and a second short-circuit point short _ B; the first short-circuit point short _ a is connected between digital ground and ground, and the second short-circuit point short _ B is connected between digital ground and ground. The setting of the short circuit point (such as 0 ohm resistance) can further filter the noise and avoid the interference, thereby providing a cleaner network signal.
Referring to fig. 3, in an implementation, the protection module 100 further includes a first anti-static protection tube U1, a second anti-static protection tube U2, a fourth capacitor C4, and a fifth capacitor C5; the pin I/O1, the pin I/O2, the pin I/O3 and the pin I/O4 of the first anti-static protection tube U1 are connected with the pin TD3-, the pin TD4+ and the pin TD 4-and the pin TD3+ of the connection network transformer T1 in a one-to-one manner; the VCC pin of the first anti-static protection tube U1 is connected with a network power supply end (providing network voltage 3P3V _ LAN) and one end of a fourth capacitor C4, and the other end of the fourth capacitor C4 and the GND pin of the first anti-static protection tube U1 are both grounded; an I/O1 pin, an I/O2 pin, an I/O3 pin and an I/O4 pin of the second anti-static protection tube U2 are connected with a TD2+ pin, a TD1+ pin, a TD 1-pin and a TD 2-pin of the connecting network transformer T1 in a one-to-one mode; the VCC pin of the second anti-static protection tube U2 is connected with the power supply end of the network and one end of the fifth capacitor C5, and the other end of the fifth capacitor C5 and the GND pin of the second anti-static protection tube U2 are both grounded.
The I/O1 pin, the I/O2 pin, the I/O3 pin and the I/O4 pin of the two anti-static protection tubes (the type is preferably ESD _ AZC199-04S _ SOT 23-6L) are used for performing anti-static protection on input network signals (MDI 0 +/-minus or plus, MDI1 +/-or plus, MDI2 +/-or plus and MDI3 +/-) so as to avoid damage to the network transformer T1 due to the fact that instantaneous high voltage occurs to the network signals input to the network transformer T1. When the abnormal voltage appears in the twinkling of an eye, prevent that the static protection tube can restrain high pressure in the twinkling of an eye and couple to ground GND, avoid high-voltage breakdown to protect the device on the mainboard not damaged by high pressure in the twinkling of an eye, play the effect of preventing static protection, better protection computer. The first capacitor C1 and the second capacitor C2 have the functions of voltage stabilization, energy storage and high-frequency noise filtering, and preferably provide stable voltage for the two anti-static protection tubes (U1 and U2).
Referring to fig. 4, the filter module 200 includes a sixth capacitor C6 (10 uF), a seventh capacitor C7 (10 uF), and an eighth capacitor C8 (1 uF); one end of the sixth capacitor C6 is connected with a power supply end (providing an input voltage +3 VSB), one end of the seventh capacitor C7, one end of the eighth capacitor C8 and a network power supply end; the other end of the sixth capacitor C6, the other end of the seventh capacitor C7 and the other end of the eighth capacitor C8 are all grounded. The sixth capacitor C6, the seventh capacitor C7 and the eighth capacitor C8 function to stabilize voltage, store energy and filter high-frequency noise, and provide a stable network voltage 3P3V _ LAN.
Referring to fig. 5, the power supply module 300 includes an LDO voltage converting chip U3, a second resistor R2, a third resistor R3, a ninth capacitor C9 (0.1 uF), and a tenth capacitor C10 (10 uF); the VIN pin of the LDO voltage conversion chip U3 is connected to one end of the second resistor R2 and a network power supply terminal, the REF pin of the LDO voltage conversion chip U3 is connected to one end of the ninth capacitor C9, the other end of the second resistor R2 and one end of the third resistor R3, the other end of the ninth capacitor C9 and the other end of the third resistor R3 are both grounded, the VCNTL1 pin, the VCNTL2 pin, the VCNTL3 pin and the VCNTL4 pin of the LDO voltage conversion chip U3 are connected to each other and connected to a reference power supply terminal (providing a reference voltage +5VSB for the operation of the LDO voltage conversion chip U3), the LDO pin of the LDO voltage conversion chip U3 is connected to one end of the tenth capacitor C10 and a chip power supply terminal of the network chip 30 (providing an operating voltage VDD10_ LAN for the network chip 30), the other end of the tenth capacitor C10 is both grounded, and the pins 0 and 1 of the LDO voltage conversion chip.
The model of the LDO voltage conversion chip U3 is preferably UP0109PSW8, which down-converts the network voltage 3P3V _ LAN of 3.3V into the working voltage VDD10_ LAN of 1.0V to supply power to the network chip 30. The second resistor R2 and the third resistor R3 divide the input network voltage 3P3V _ LAN to obtain a reference voltage LANPWRVREF for the operation of the LDO voltage conversion chip U3, and meanwhile, R3 and C9 form an RC delay circuit to meet the requirement of power-on timing. The tenth capacitor C10 has the functions of voltage stabilization, energy storage and high-frequency noise filtering, and provides stable working voltage for the network chip, so that the network chip works stably and efficiently.
The power supply module 300 further comprises an eleventh capacitor C11 (10 uF), a twelfth capacitor C12 (10 uF) and a thirteenth capacitor C13 (0.1 uF); one end of the eleventh capacitor C11 is connected to a VIN pin of the LDO voltage conversion chip U3 and a network power supply terminal, one end of the twelfth capacitor C12 is connected to a VCNTL1 pin of the LDO voltage conversion chip U3 and a reference power supply terminal, and one end of the thirteenth capacitor C13 is connected to one end of the tenth capacitor C10 and a chip power supply terminal of the network chip 30; the other end of the eleventh capacitor C11, the other end of the twelfth capacitor C12 and the other end of the thirteenth capacitor C13 are all grounded.
The eleventh capacitor C11 has the functions of voltage stabilization, energy storage, and high-frequency noise filtering, so that the input network voltage 3P3V _ LAN is more stable and clean. The twelfth capacitor C12 has the functions of voltage stabilization, energy storage and high-frequency noise filtering, so that the LDO voltage conversion chip U3 can work more stably and efficiently. The thirteenth capacitor C13 further enhances the voltage stabilization, energy storage, and high frequency noise filtering effects on the operating voltage VDD10_ LAN.
In summary, the network interface protection circuit and the terminal device provided by the invention utilize the characteristics of the TVS and combine with the RC filter circuit formed by the first resistor and the first capacitor to suppress the instantaneous high voltage to the ground, thereby protecting the board end device from being damaged by the voltage and playing a role of surge voltage protection; by utilizing the characteristics of the anti-static protection tube, ESD and EOS at the plate end are effectively inhibited, and parts at the plate end are protected from being burnt by static electricity; the LDO voltage conversion chip is used for providing stable working voltage for the network chip, so that the network chip works stably and efficiently.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (9)

1. A network interface protection circuit is connected with a network interface and a network chip and is characterized by comprising a protection module, a filtering module and a power supply module;
the protection module converts the network signal output by the network chip into a network data signal and transmits the network data signal to the network interface, and further performs anti-surge and anti-static protection; the filtering module filters, stabilizes and filters noise of the input voltage and outputs network voltage; the power supply module converts the network voltage into working voltage, stabilizes the working voltage and outputs the working voltage to the network chip for power supply;
the protection module comprises a network transformer, a first diode, a first resistor, a first capacitor, a second capacitor and a third capacitor;
the TD1+ pin, the TD 1-pin, the TD2+ pin, the TD 2-pin, the TD3+ pin, the TD 3-pin, the TD4+ pin and the TD 4-pin of the network transformer are connected with a network chip; the TCT1 pin of the network transformer is grounded through a second capacitor, and the TCT1 pin of the network transformer is also connected with the TCT2 pin, the TCT3 pin and the TCT4 pin of the network transformer; the TCT3 pin of the network transformer is grounded through a third capacitor, and the MX1+ pin, the MX 1-pin, the MX2+ pin, the MX 2-pin, the MX3+ pin, the MX 3-pin, the MX4+ pin and the MX 4-pin of the network transformer are connected with a network interface; the MCT1 pin of the network transformer is connected with the MCT2 pin, the MCT3 pin and the MCT4 pin of the network transformer; the MCT3 pin of the network transformer is also connected with one end of a first capacitor through a first resistor, and the MCT4 pin of the network transformer is also connected with the other end of the first capacitor and digital ground through a first diode.
2. The network interface protection circuit of claim 1, wherein the protection module further comprises a first shorting point and a second shorting point;
the first short-circuit point is connected between digital ground and ground, and the second short-circuit point is connected between digital ground and ground.
3. The network interface protection circuit of claim 2, wherein the protection module further comprises a first anti-static protection tube, a second anti-static protection tube, a fourth capacitor and a fifth capacitor;
the pins I/O1, I/O2, I/O3 and I/O4 of the first anti-static protection tube are connected with the pins TD3-, TD4+, TD 4-and TD3+ of the network transformer in a one-to-one manner; the VCC pin of the first anti-static protection tube is connected with a network power supply end and one end of a fourth capacitor, and the other end of the fourth capacitor and the GND pin of the first anti-static protection tube are both grounded; the pins I/O1, I/O2, I/O3 and I/O4 of the second anti-static protection tube are connected with the pins TD2+, TD1+, TD 1-and TD 2-of the network transformer in a one-to-one manner; the VCC pin of the second anti-static protection tube is connected with the network power supply end and one end of the fifth capacitor, and the other end of the fifth capacitor and the GND pin of the second anti-static protection tube are both grounded.
4. The network interface protection circuit of claim 1, wherein the filtering module comprises a sixth capacitor, a seventh capacitor, and an eighth capacitor;
one end of the sixth capacitor is connected with the power supply end, one end of the seventh capacitor, one end of the eighth capacitor and the network power supply end; the other end of the sixth capacitor, the other end of the seventh capacitor and the other end of the eighth capacitor are all grounded.
5. The network interface protection circuit of claim 1, wherein the power supply module comprises an LDO voltage conversion chip, a second resistor, a third resistor, a ninth capacitor, and a tenth capacitor;
the VIN pin of the LDO voltage conversion chip is connected with one end of the second resistor and a network power supply end, the REF pin of the LDO voltage conversion chip is connected with one end of the ninth capacitor, the other end of the second resistor and one end of the third resistor, the other end of the ninth capacitor and the other end of the third resistor are all grounded, the VCNTL1 pin of the LDO voltage conversion chip, the VCNTL2 pin, the VCNTL3 pin and the VCNTL4 pin are connected with each other and connected with a reference power supply end, the VOUT pin of the LDO voltage conversion chip is connected with one end of the tenth capacitor and a chip power supply end of the network chip, the other end of the tenth capacitor is all grounded, and the GND0 pin and the GND1 pin of the LD.
6. The network interface protection circuit of claim 5, wherein the power module further comprises an eleventh capacitor, a twelfth capacitor, and a thirteenth capacitor;
one end of the eleventh capacitor is connected with a VIN pin of the LDO voltage conversion chip and a network power supply end, one end of the twelfth capacitor is connected with a VCNTL1 pin of the LDO voltage conversion chip and a reference power supply end, and one end of the thirteenth capacitor is connected with one end of the tenth capacitor and a chip power supply end of the network chip; the other end of the eleventh capacitor, the other end of the twelfth capacitor and the other end of the thirteenth capacitor are all grounded.
7. The network interface protection circuit of claim 1, wherein the network transformer is model number GSC-2418-R.
8. The network interface protection circuit of claim 3, wherein the first and second ESD protection tubes are ESD _ AZC199-04S _ SOT 23-6.
9. A terminal device, comprising a main board, wherein the main board is provided with a network interface and a network chip, and is characterized in that the terminal device is further provided with a network interface protection circuit according to any one of claims 1 to 8;
the network interface protection circuit converts a network signal output by the network chip into a network data signal and transmits the network data signal to the network interface, and also converts a network voltage into a working voltage and outputs the working voltage to the network chip for power supply and anti-surge and anti-static protection.
CN201911387546.6A 2019-12-30 2019-12-30 Network interface protection circuit and terminal equipment Pending CN110768230A (en)

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CN113103976A (en) * 2021-04-21 2021-07-13 宁波汽车软轴软管有限公司 Automobile P key fault detection system

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