CN209929946U - Power supply protection circuit of Ethernet switch - Google Patents
Power supply protection circuit of Ethernet switch Download PDFInfo
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- CN209929946U CN209929946U CN201920546339.XU CN201920546339U CN209929946U CN 209929946 U CN209929946 U CN 209929946U CN 201920546339 U CN201920546339 U CN 201920546339U CN 209929946 U CN209929946 U CN 209929946U
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Abstract
A power over ethernet switch protection circuit, the circuit comprising: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a fuse, a first capacitor, a second capacitor, a third capacitor, a first voltage regulator tube, a second voltage regulator tube, an MOS tube, a first diode, a second diode, a third diode, a first triode, a second triode, a third triode and a DC-DC power module. The utility model discloses an adjust the value of a plurality of resistances and electric capacity, can realize forming the circuit of voltage stabilization to the control of voltage, when external power supply voltage was too big, can slowly improve voltage, prevent the harm of instantaneous heavy current to inside components and parts, guaranteed the stability of ethernet switch internal circuit system, realized the protection to the switch.
Description
Technical Field
The utility model relates to an electron technique, electronic equipment field, concretely relates to ethernet switch power supply protection circuit.
Background
The Ethernet switch is a switch for transmitting data based on Ethernet, and the Ethernet adopts a local area network of a shared bus type transmission medium mode. It has the most common application, lower price and complete grade. Therefore, the application field is very wide, and the trace images of the local area networks can be seen in large and small local area networks. Ethernet switches typically have several to tens of ports, essentially a multi-port bridge. In addition, the port rate can be different, and the operation mode can also be different, for example, 10M or 100M bandwidth can be provided, half-duplex, full-duplex, adaptive operation mode can be provided, and the like. At present, the use of an ethernet interface at the speed of hundreds of meganets is more and more widespread, but the switch is often used in a fixed cabinet, does not need to be moved frequently, and is often used in an office building, an enterprise warehouse or a school machine room. The situations of circuit installation, maintenance and removal often occur in the places, and the situation that the voltage of an external power supply is unstable or the external power supply is directly powered off can occur at the moment. In addition, the switch is different in the conversion voltage of the external power adapter due to different specifications, if the voltage of the external power supply is too large, the switch power receiving system can absorb a large amount of current from the external power supply in the moment of switching on the power supply, and the internal circuit board card of the switch can be damaged under the conditions.
The existing ethernet switch has weak protection circuit performance and relatively poor protection capability, so the above problems need to be solved urgently.
SUMMERY OF THE UTILITY MODEL
The utility model provides an ethernet switch power supply protection circuit, the problem that exists among the above-mentioned prior art is solved to its purpose, improves the compatibility of switch, reduces the damage of external power supply to the inside circuit integrated circuit board of switch, realizes the protection to the inside circuit device of ethernet.
A power protection circuit for an ethernet switch, the circuit comprising:
a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a fuse, a first capacitor, a second capacitor, a third capacitor, a first voltage regulator tube, a second voltage regulator tube, an MOS tube, a first diode, a second diode, a third diode, a first triode, a second triode, a third triode, and a DC-DC power supply module, wherein,
an external power supply is connected into the power supply protection circuit of the Ethernet switch, a first resistor and a second resistor are connected with the external power supply in series, the first resistor is connected with the positive electrode of the external power supply, the second resistor is connected with the grid electrode of an MOS (metal oxide semiconductor) tube, the drain electrode of the MOS tube is connected with a fuse, the other end of the fuse is connected with the negative electrode of the external power supply, the connecting end of the first resistor and the second resistor is connected with the input end of a first diode, the output end of the first diode is connected with the input end of the first voltage-regulator tube, one end of a third resistor and one end of a fourth resistor, the output end of the first voltage-regulator tube is connected with the positive electrode of the external power supply, the other end of the third resistor is connected with the negative electrode of the external power supply, the other end of the fourth resistor is connected with the base electrode of a first triode, the collector electrode of the, the other end of the first capacitor is connected with the negative electrode of an external power supply, the second capacitor is connected with a second voltage-regulator tube in series, one end of the second capacitor is connected with the positive electrode of the external power supply, the other end of the second voltage-regulator tube is connected with the negative electrode of the external power supply and one end of a third capacitor, an eighth resistor is connected with a third capacitor in series, one end of an eighth resistor is connected with the connecting end of the third resistor and the external power supply, the other end of the third capacitor is connected with the external power supply and one end of the second voltage-regulator tube, the connecting section of the second capacitor and the second voltage-regulator tube is connected with the base electrode of a second triode, the collector electrode of the second triode is connected with one end of a tenth resistor, the other end of the tenth resistor is connected with the positive electrode of the external power supply, the connecting end of the tenth resistor and the positive electrode of the external power, the other end of the fifth resistor and the fuse are connected with a grounding end, the output end of the second diode is connected with a sixth resistor and a seventh resistor, the other end of the sixth resistor is connected with a third diode, the third diode is connected with a ninth resistor and the negative electrode of an external power supply, the other end of the seventh resistor is connected with the emitting electrode of a third triode, the base electrode of the third triode, the other end of the ninth resistor and the external power supply are connected with a DC-DC power supply module, and the DC-DC power supply module supplies power to the Ethernet switch.
Further, the MOS tube is an N-channel MOS tube.
Further, the model of the first voltage-stabilizing tube is WL 5572.
Further, the second capacitor is an electrolytic capacitor with the model number of CD 71.
The utility model has the advantages that:
the utility model provides a set of brand-new ethernet circuit protection architecture, when the external power supply of difference inserts, through the value of adjusting a plurality of resistance and electric capacity, can realize the control to voltage, form the circuit of voltage stabilization. The power supply circuit is independent by utilizing a reverse connection method and combining the characteristics of the MOS tube, the power can be taken from the main series circuit to supply power to a load, the protection of the circuit device inside the Ethernet switch can be realized only by one MOS tube, two diodes and a resistor which are connected in series, the circuit is simple and reliable, the design is reasonable, the self-power consumption is very small, and the cost is low; in addition, the power supply protection circuit can also rapidly cut off the path when the Ethernet switch or the power load has a short circuit phenomenon, thereby achieving the purpose of short circuit protection. When external power supply voltage is too big, can slowly improve voltage, prevent the harm of instantaneous heavy current to inside components and parts, guaranteed the stability of ethernet switch internal circuit system, realized the protection to the switch.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings. In the description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, and it will be appreciated that the examples are merely illustrative of the present invention and are not intended to limit the scope of the invention.
Fig. 1 shows a circuit diagram of the present invention. Wherein the circuit comprises:
a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a fuse F1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first voltage regulator ZD1, a second voltage regulator ZD2, a MOS transistor M1, a first diode D1, a second diode D2, a third diode D3, a first triode Q1, a second triode Q2, a third triode Q3 and a DC-DC power supply module, wherein,
an external power supply is connected into the power supply protection circuit of the Ethernet switch, a first resistor R1 and a second resistor R2 are connected with the external power supply in series, a first resistor R1 is connected with the anode of the external power supply, a second resistor R2 is connected with the grid of a MOS tube M1, the drain of the MOS tube M1 is connected with a fuse F1, the other end of the fuse F1 is connected with the cathode of the external power supply, the connecting end of the first resistor R1 and the second resistor R2 is connected with the input end of a first diode D1, the output end of the first diode D1 is connected with the input end of a first voltage regulator ZD1, one end of a third resistor R3 and one end of a fourth resistor R4, the output end of the first voltage regulator R1 is connected with the anode of the external power supply, the other end of the third resistor R3 is connected with the cathode of the external power supply, the other end of the fourth resistor R4 is connected with the base of a first triode Q1, and the collector of the first triode Q1 is, an emitting electrode of a first triode Q1 is connected with one end of a first capacitor C1, the other end of the first capacitor C1 is connected with a negative electrode of an external power supply, a second capacitor C2 is connected with a second voltage-regulator tube ZD2 in series, one end of a second capacitor C2 is connected with a positive electrode of the external power supply, the other end of the second voltage-regulator tube ZD2 is connected with a negative electrode of the external power supply and one end of a third capacitor C3, an eighth resistor R8 is connected with a third capacitor C3 in series, one end of an eighth resistor R8 is connected with a connecting end of a third resistor R3 and the external power supply, the other end of the third capacitor C3 is connected with the external power supply and one end of a second voltage-regulator tube 2, a connecting section of the second capacitor C2 and the second voltage-regulator tube 2 is connected with a base of the second triode Q2, a collector of the second triode Q2 is connected with one end of a tenth resistor R10, the other end of the tenth resistor R10 is connected with a connecting end of a collector of the third triode ZD 24, an emitter of a second triode Q2 is connected with a fifth resistor R5 and a second diode D2, the other end of the fifth resistor R5 and a fuse F1 are connected with the ground terminal, an output end of the second diode D2 is connected with a sixth resistor R6 and a seventh resistor R7, the other end of the sixth resistor R6 is connected with a third diode D3, the third diode D3 is connected with a ninth resistor R9 and the negative electrode of an external power supply, the other end of the seventh resistor R7 is connected with an emitter of a third triode Q3, the base of the third triode Q3, the other end of the ninth resistor R9 and the external power supply are connected with a DC-DC power supply module, and the DC-DC power supply module supplies power to an Ethernet switch.
An external power supply supplies power to the whole circuit, a first voltage-regulator tube ZD1, a fourth resistor R4, a first triode Q1, a first capacitor C1, a second capacitor C2 and a second voltage-regulator tube ZD2 form a protection circuit, a tenth resistor R10, a second triode Q2 and a fifth resistor R5 form a series circuit, and the two groups of circuits guarantee the current stability inside the switch system. The voltage loaded on the DC-DC power supply module can be adjusted by adjusting each resistor and each capacitor of the circuit, so that the impact of instantaneous large current on the circuit is reduced, and the influence on an Ethernet switch caused by external power supply voltage change and power plugging and unplugging of the Ethernet switch is avoided.
The working principle of the invention is as follows: when the power supply is used, the power supply is connected, the second capacitor is charged after being rectified by the first resistor, the second resistor and the first voltage regulator tube, when the voltage of the second capacitor rises to a starting voltage, the power supply module starts to work, and the load is not damaged under the condition of voltage surge. The power VCC is rectified and reduced by 220V mains voltage, combines the characteristics of MOS tubes, is independent of a power supply circuit, can get power on a main series circuit to supply a load, enables the MOS tubes to generate VGS starting voltage, and only needs one MOS tube, two diodes connected in series and a resistor to realize the protection of an internal circuit device of the Ethernet switch. And one part of the voltage supplies power to the power supply module, and is added to the reference electrode of the MOS tube after passing through the fourth resistor and the first triode. When the voltage is normal, the divided voltage is not enough to enable the MOS tube to be conducted, so that the second diode is not conducted, the third triode is not conducted, the external power supply enters the power module through the fifth resistor and the third diode, when the power voltage exceeds a critical range, the voltage divided by the fifth resistor and the seventh resistor enables the MOS tube to be conducted, so that the second diode is conducted, the third triode is also conducted, the grid voltage of the MOS tube 1 is cut off, the Ethernet circuit loop is disconnected, the external power supply current voltage stabilizing circuit flows through the protection circuit, flows into the DC-DC power module after being regulated by the voltage, and then flows out to supply power to the Ethernet switch.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (4)
1. A power protection circuit for an ethernet switch, the circuit comprising:
a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a fuse, a first capacitor, a second capacitor, a third capacitor, a first voltage regulator tube, a second voltage regulator tube, an MOS tube, a first diode, a second diode, a third diode, a first triode, a second triode, a third triode, and a DC-DC power supply module, wherein,
an external power supply is connected into the power supply protection circuit of the Ethernet switch, a first resistor and a second resistor are connected with the external power supply in series, the first resistor is connected with the positive electrode of the external power supply, the second resistor is connected with the grid electrode of an MOS (metal oxide semiconductor) tube, the drain electrode of the MOS tube is connected with a fuse, the other end of the fuse is connected with the negative electrode of the external power supply, the connecting end of the first resistor and the second resistor is connected with the input end of a first diode, the output end of the first diode is connected with the input end of the first voltage-regulator tube, one end of a third resistor and one end of a fourth resistor, the output end of the first voltage-regulator tube is connected with the positive electrode of the external power supply, the other end of the third resistor is connected with the negative electrode of the external power supply, the other end of the fourth resistor is connected with the base electrode of a first triode, the collector electrode of the, the other end of the first capacitor is connected with the negative electrode of an external power supply, the second capacitor is connected with a second voltage-regulator tube in series, one end of the second capacitor is connected with the positive electrode of the external power supply, the other end of the second voltage-regulator tube is connected with the negative electrode of the external power supply and one end of a third capacitor, an eighth resistor is connected with a third capacitor in series, one end of an eighth resistor is connected with the connecting end of the third resistor and the external power supply, the other end of the third capacitor is connected with the external power supply and one end of the second voltage-regulator tube, the connecting section of the second capacitor and the second voltage-regulator tube is connected with the base electrode of a second triode, the collector electrode of the second triode is connected with one end of a tenth resistor, the other end of the tenth resistor is connected with the positive electrode of the external power supply, the connecting end of the tenth resistor and the positive electrode of the external power, the other end of the fifth resistor and the fuse are connected with a grounding end, the output end of the second diode is connected with a sixth resistor and a seventh resistor, the other end of the sixth resistor is connected with a third diode, the third diode is connected with a ninth resistor and the negative electrode of an external power supply, the other end of the seventh resistor is connected with the emitting electrode of a third triode, the base electrode of the third triode, the other end of the ninth resistor and the external power supply are connected with a DC-DC power supply module, and the DC-DC power supply module supplies power to the Ethernet switch.
2. An Ethernet switch power protection circuit of claim 1,
the MOS tube is an N-channel MOS tube.
3. An Ethernet switch power protection circuit of claim 1,
the model of the first voltage-stabilizing tube is WL 5572.
4. An Ethernet switch power protection circuit of claim 1,
the second capacitor is an electrolytic capacitor with the model number of CD 71.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920546339.XU CN209929946U (en) | 2019-04-22 | 2019-04-22 | Power supply protection circuit of Ethernet switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920546339.XU CN209929946U (en) | 2019-04-22 | 2019-04-22 | Power supply protection circuit of Ethernet switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209929946U true CN209929946U (en) | 2020-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920546339.XU Expired - Fee Related CN209929946U (en) | 2019-04-22 | 2019-04-22 | Power supply protection circuit of Ethernet switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209929946U (en) |
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2019
- 2019-04-22 CN CN201920546339.XU patent/CN209929946U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Bai Yi Document name: Notice of termination of patent |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200110 Termination date: 20200422 |