CN212012139U - Lightning protection device for power supply and high-speed differential signal multiplexing interface - Google Patents
Lightning protection device for power supply and high-speed differential signal multiplexing interface Download PDFInfo
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- CN212012139U CN212012139U CN202020909402.4U CN202020909402U CN212012139U CN 212012139 U CN212012139 U CN 212012139U CN 202020909402 U CN202020909402 U CN 202020909402U CN 212012139 U CN212012139 U CN 212012139U
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Abstract
The utility model relates to a lightning protection device to multiplexing interface of power and high-speed differential signal, including compound input port and power output branch road and high-speed differential signal output branch road, compound input port with power output branch road reaches be equipped with one-level protection module between the high-speed differential signal output branch road, one-level protection module include a three-terminal discharge tube and two with the piezo-resistor of three-terminal discharge tube series connection, one-level protection module is used for the common mode protection and the differential mode protection of multiplexing interface; the common mode protection discharge path is from a voltage dependent resistor to a pin of a three-terminal discharge tube connected with the voltage dependent resistor to a grounding pin of the three-terminal discharge tube; the discharge path of the differential mode protection is from the first piezoresistor RV1 to the three-terminal discharge tube to the second piezoresistor RV 2. The lightning protection device needs fewer circuit components, so that the production cost is reduced, and the occupied space of the PCB is reduced; compared with the traditional lightning protection circuit, the high-speed signal is attenuated less.
Description
Technical Field
The utility model relates to a direct current line carrier communication technical field, concretely relates to lightning protection device to power and the multiplexing interface of high-speed differential signal.
Background
Power Line carrier Communication PLC (Power Line Communication) is carrier Communication using a Power Line as a transmission channel, is a Communication method specific to a Power system, and is a technology for transmitting an analog or digital signal at high speed by a carrier method using an existing Power Line.
It is indispensable to set up lightning protection circuit at the input of power signal and the multiplexing interface of high-speed differential signal, in current protection circuit design, adopts 3 piezo-resistors and 3 discharge tubes usually, separates common mode protection and differential mode protection design, makes common mode protection and differential mode protection realize through a piezo-resistor respectively. The protection circuit has the advantages of more design materials, high cost, larger occupied space of a PCB surface, large attenuation to high-speed signals and reduced performance.
SUMMERY OF THE UTILITY MODEL
In view of the above, there is a need for a lightning protection device with simple structure and fewer circuit components for power supply and high-speed differential signal multiplexing interface.
The utility model provides a lightning protection device to multiplexing interface of power and high-speed differential signal, includes compound input port and power output branch road and high-speed differential signal output branch road, compound input port with power output branch road reaches be equipped with one-level protection module between the high-speed differential signal output branch road, one-level protection module include one three-terminal discharge tube and two with the piezo-resistor of three-terminal discharge tube series connection, one-level protection module is used for limiting surge voltage, plays overvoltage protection's effect to the circuit.
Further, the two piezoresistors comprise a first piezoresistor RV1 and a second piezoresistor RV2, the first piezoresistor RV1 and the second piezoresistor RV2 are respectively connected in series to pins at two ends of the three-end discharge tube, and a middle pin of the three-end discharge tube is grounded.
Furthermore, the primary protection module is bridged on two output signal lines of the composite input port; the free ends of the first piezoresistor RV1 and the second piezoresistor RV2 are respectively connected to the two output signal lines of the composite input port.
Furthermore, the two input signal lines of the power output branch and the two input signal lines of the high-speed differential signal output branch are respectively connected to the two output signal lines of the composite input port.
Further, the power output branch comprises a power decoupling circuit, a power secondary protection module and a power output port which are sequentially arranged, the power output port is connected with a power output end surge absorption circuit in a bridging mode, and the power output end surge absorption circuit comprises a transient voltage suppression diode D2.
Further, the power decoupling circuit includes a first inductor L1 and a second inductor L2, where the first inductor L1 and the second inductor L2 are respectively connected in series to two input signal lines of the power output branch, and the power decoupling circuit is configured to eliminate parasitic coupling generated on the power output branch when a circuit network current changes.
Further, the power supply secondary protection module adopts an electromagnetic interference filter, the electromagnetic interference filter comprises a filter capacitor C8 and a common mode choke CMC1, and the power supply secondary protection module is used for suppressing electromagnetic interference from the circuit input end.
Furthermore, the high-speed differential signal output branch comprises a high-speed signal decoupling circuit, a power isolation circuit, a high-speed signal secondary protection module and a high-speed signal output port which are sequentially arranged, the high-speed signal output port is connected with a high-speed signal output end surge absorption circuit in a crossing mode, and the high-speed signal output end surge absorption circuit comprises a transient voltage suppression diode D1.
Further, the high-speed signal decoupling circuit comprises a first resistor R10 and a second resistor R12, the first resistor R10 and the second resistor R12 are respectively connected in series on the two input signal lines of the high-speed differential signal output branch, and the high-speed signal decoupling circuit is used for eliminating parasitic coupling generated on the high-speed differential signal output branch when the current of a circuit network changes.
Further, the output ends of the first resistor R10 and the second resistor R12 are respectively connected in series with a first high-voltage capacitor C9 and a second high-voltage capacitor C10, the first high-voltage capacitor C9 and the second high-voltage capacitor C10 form the power isolation circuit and the high-speed signal secondary protection module, and the first high-voltage capacitor C9 and the second high-voltage capacitor C10 are used for isolating the power signal from the composite input port, so that overvoltage protection of the high-speed signal output port is realized.
In the lightning protection device for the power supply and the high-speed differential signal multiplexing interface, the primary protection module is used for common-mode protection and differential-mode protection of the multiplexing interface; the common mode protection discharge path is from a voltage dependent resistor to a pin of a three-terminal discharge tube connected with the voltage dependent resistor to a grounding pin of the three-terminal discharge tube; the discharge path of the differential mode protection is from the first piezoresistor RV1 to the three-terminal discharge tube to the second piezoresistor RV 2. The lightning protection device needs fewer circuit components, so that the production cost is reduced, and the occupied space of the PCB is reduced; compared with the traditional lightning protection circuit, the high-speed signal is attenuated less. The utility model discloses an installation structure is simple, easily production, low cost, facilitate promotion.
Drawings
Fig. 1 is a block diagram of a lightning protection device for a power supply and a high-speed differential signal multiplexing interface according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a lightning protection device for a power supply and a high-speed differential signal multiplexing interface according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments and drawings.
Please refer to fig. 1 and fig. 2, which illustrate a lightning protection device 100 for power supply and high-speed differential signal multiplexing interface provided by an embodiment of the present invention, which includes a composite input port 10, a power output branch 30 and a high-speed differential signal output branch 40, a primary protection module 20 is disposed between the composite input port 10 and the power output branch 30 as well as between the high-speed differential signal output branch 40, the primary protection module 20 includes a three-terminal discharge tube and two voltage dependent resistors connected in series with the three-terminal discharge tube, and the primary protection module 20 is used for limiting surge voltage and performing overvoltage protection on the circuit.
Further, the two piezoresistors comprise a first piezoresistor RV1 and a second piezoresistor RV2, the first piezoresistor RV1 and the second piezoresistor RV2 are respectively connected in series to pins at two ends of the three-end discharge tube, and a middle pin of the three-end discharge tube is grounded. The primary protection module 20 is bridged on two output signal lines of the composite input port 10; the free ends of the first piezoresistor RV1 and the second piezoresistor RV2 are respectively connected to the two output signal lines of the composite input port 10.
Specifically, a first pin of the three-terminal discharge tube is connected to the second piezoresistor RV2, a third pin is connected to the first piezoresistor RV1, and a second pin is grounded.
The two common mode protection discharge paths of the primary protection module 20 are respectively:
a first path: the first piezoresistor RV1, the third pin of the three-terminal discharge tube, is the second pin of the three-terminal discharge tube;
a second path: the second piezoresistor RV 2-the first pin of the three-terminal discharge tube-the second pin of the three-terminal discharge tube.
The differential mode protection discharge path of the primary protection module 20 is: the first piezoresistor RV1, the third pin of the three-terminal discharge tube, the second pin of the three-terminal discharge tube, the first pin of the three-terminal discharge tube, and the second piezoresistor RV 2.
Specifically, the conducting threshold voltage of the piezoresistor is utilized to prevent the short circuit of the power supply when the discharge tube acts; meanwhile, the low junction capacitance of the discharge tube is used for preventing the high-speed differential signal from being absorbed.
Specifically, assume that: the breakover threshold voltage of the voltage dependent resistor is 120V, and the junction capacitance is 100 pF; the turn-on threshold voltage of the discharge tube is 90V and the junction capacitance is 1 pF.
When only using piezo-resistor, when surge voltage was higher than 120V, the piezo-resistor switched on, can reach the protection effect, but this moment the junction capacitance reaches 100pF, and high-speed signal is absorbed, causes the performance degradation.
When only the discharge tube is used, the discharge tube is conducted when the surge voltage is higher than 90V, and the protection effect can be achieved. However, when the discharge tube is turned on, the discharge tube is in a short circuit state, and the power supply is discharged through the discharge tube and cannot be recovered, so that the power supply is over-current.
When the piezoresistor and the discharge tube are connected in series for use, the piezoresistor can prevent a power supply from short circuit, the discharge tube can prevent the signal from being absorbed, the conduction voltage can be increased to 210V, namely the conduction threshold voltage of the piezoresistor is the sum of 120V and the conduction threshold voltage of the discharge tube is 90V, and when the surge voltage is higher than 210V, the piezoresistor and the discharge tube are opened for protection.
Specifically, when a high voltage is introduced to the input end of the power output branch 30, the discharge is performed through the first path of the primary protection module 20; when a high voltage is introduced to the input terminal of the high-speed differential signal output branch circuit 40, discharging through the second path of the primary protection module 20; when the composite input port 10 is introduced by high voltage, the discharge is performed through the differential mode protection discharge path of the primary protection module 20, so as to achieve the lightning protection effect.
Further, the two input signal lines of the power output branch 30 and the two input signal lines of the high-speed differential signal output branch 40 are respectively connected to the two output signal lines of the composite input port 10.
Further, the power output branch 30 includes a power decoupling circuit 31, a power secondary protection module 32 and a power output port 33, which are sequentially arranged, where the power output port 33 is connected across a power output end surge absorption circuit, and the power output end surge absorption circuit includes a transient voltage suppression diode D2. The power decoupling circuit 31 includes a first inductor L1 and a second inductor L2, the first inductor L1 and the second inductor L2 are respectively connected in series to two input signal lines of the power output branch 30, and the power decoupling circuit 31 is configured to eliminate parasitic coupling generated on the power output branch 30 when a circuit network current changes. The power supply secondary protection module 32 adopts an electromagnetic interference filter, the electromagnetic interference filter comprises a filter capacitor C8 and a common mode choke CMC1, and the power supply secondary protection module 32 is used for suppressing electromagnetic interference from the circuit input end.
Specifically, the transient voltage suppressor diode D2 employs a transient voltage suppressor SMCJ 58A.
Further, the high-speed differential signal output branch 40 includes a high-speed signal decoupling circuit 41, a power isolation circuit 42, a high-speed signal secondary protection module 43, and a high-speed signal output port 44, which are sequentially arranged, where the high-speed signal output port 44 is connected across a high-speed signal output end surge absorption circuit, and the high-speed signal output end surge absorption circuit includes a transient voltage suppression diode D1. The high-speed signal decoupling circuit 41 includes a first resistor R10 and a second resistor R12, the first resistor R10 and the second resistor R12 are respectively connected in series to the two input signal lines of the high-speed differential signal output branch 40, and the high-speed signal decoupling circuit 41 is configured to eliminate parasitic coupling generated on the high-speed differential signal output branch 40 when a circuit network current changes. The output ends of the first resistor R10 and the second resistor R12 are respectively connected in series with a first high-voltage capacitor C9 and a second high-voltage capacitor C10, the first high-voltage capacitor C9 and the second high-voltage capacitor C10 form the power isolation circuit 42 and the high-speed signal secondary protection module 43, and the first high-voltage capacitor C9 and the second high-voltage capacitor C10 are used for isolating a power signal from the composite input port 10 to realize overvoltage protection of the high-speed signal output port 44.
In particular, the transient voltage suppression diode D1 employs a transient suppression diode BV 12C.
In the lightning protection device 100 for multiplexing power and high-speed differential signals, the primary protection module 20 is used for common-mode protection and differential-mode protection of the multiplexing interface; the common mode protection discharge path is from a voltage dependent resistor to a pin of a three-terminal discharge tube connected with the voltage dependent resistor to a grounding pin of the three-terminal discharge tube; the discharge path of the differential mode protection is from the first piezoresistor RV1 to the three-terminal discharge tube to the second piezoresistor RV 2. The lightning protection device needs fewer circuit components, so that the production cost is reduced, and the occupied space of the PCB is reduced; compared with the traditional lightning protection circuit, the high-speed signal is attenuated less. The utility model discloses an installation structure is simple, easily production, low cost, facilitate promotion.
It should be noted that the present invention is not limited to the above embodiments, and other changes can be made by those skilled in the art according to the spirit of the present invention, and all the changes made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. The lightning protection device for the power supply and high-speed differential signal multiplexing interface is characterized by comprising a composite input port, a power supply output branch and a high-speed differential signal output branch, wherein a primary protection module is arranged between the composite input port and the power supply output branch and between the composite input port and the high-speed differential signal output branch, the primary protection module comprises a three-terminal discharge tube and two piezoresistors connected with the three-terminal discharge tube in series, and the primary protection module is used for limiting surge voltage and playing a role in overvoltage protection on a circuit.
2. The lightning protection device for power supply and high-speed differential signal multiplexing interface of claim 1, wherein the two piezoresistors include a first piezoresistor RV1 and a second piezoresistor RV2, the first piezoresistor RV1 and the second piezoresistor RV2 are respectively connected in series to two end pins of the three-end discharge tube, and a middle pin of the three-end discharge tube is grounded.
3. The lightning protection device for a power supply and high-speed differential signal multiplexing interface of claim 2, wherein the primary protection module is connected across two output signal lines of the composite input port; the free ends of the first piezoresistor RV1 and the second piezoresistor RV2 are respectively connected to the two output signal lines of the composite input port.
4. The lightning protection device for a power supply and high-speed differential signal multiplexing interface according to claim 3, wherein the two input signal lines of the power supply output branch and the two input signal lines of the high-speed differential signal output branch are respectively connected to the two output signal lines of the composite input port.
5. The lightning protection device for a power supply and high-speed differential signal multiplexing interface of claim 4, wherein the power supply output branch comprises a power supply decoupling circuit, a power supply secondary protection module and a power supply output port, which are sequentially arranged, the power supply output port is connected across a power supply output end surge absorption circuit, and the power supply output end surge absorption circuit comprises a transient voltage suppression diode D2.
6. The lightning protection device for a power and high speed differential signal multiplexing interface of claim 5, wherein the power decoupling circuit comprises a first inductor L1 and a second inductor L2, the first inductor L1 and the second inductor L2 are respectively connected in series to two input signal lines of the power output branch, and the power decoupling circuit is configured to eliminate parasitic coupling generated on the power output branch when a circuit network current changes.
7. The lightning protection device for a power supply and high speed differential signal multiplexing interface of claim 5, wherein the power supply secondary protection module employs an electromagnetic interference filter comprising a filter capacitor C8 and a common mode choke CMC1, the power supply secondary protection module being configured to suppress electromagnetic interference from the circuit input.
8. The lightning protection device for the power supply and high-speed differential signal multiplexing interface of claim 4, wherein the high-speed differential signal output branch comprises a high-speed signal decoupling circuit, a power supply isolation circuit, a high-speed signal secondary protection module and a high-speed signal output port, which are sequentially arranged, the high-speed signal output port is connected across a high-speed signal output port surge absorption circuit, and the high-speed signal output port surge absorption circuit comprises a transient voltage suppression diode D1.
9. The lightning protection device for a power supply and high-speed differential signal multiplexing interface of claim 8, wherein the high-speed signal decoupling circuit comprises a first resistor R10 and a second resistor R12, the first resistor R10 and the second resistor R12 are respectively connected in series to two input signal lines of the high-speed differential signal output branch, and the high-speed signal decoupling circuit is configured to eliminate parasitic coupling generated on the high-speed differential signal output branch when a circuit network current changes.
10. The lightning protection device for power supply and high-speed differential signal multiplexing interfaces as claimed in claim 9, wherein the output ends of the first resistor R10 and the second resistor R12 are respectively connected in series with a first high-voltage capacitor C9 and a second high-voltage capacitor C10, the first high-voltage capacitor C9 and the second high-voltage capacitor C10 form the power isolation circuit and the high-speed signal secondary protection module, and the first high-voltage capacitor C9 and the second high-voltage capacitor C10 are used for isolating the power supply signal from the composite input port, thereby realizing overvoltage protection for the high-speed signal output port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020909402.4U CN212012139U (en) | 2020-05-26 | 2020-05-26 | Lightning protection device for power supply and high-speed differential signal multiplexing interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020909402.4U CN212012139U (en) | 2020-05-26 | 2020-05-26 | Lightning protection device for power supply and high-speed differential signal multiplexing interface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212012139U true CN212012139U (en) | 2020-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020909402.4U Active CN212012139U (en) | 2020-05-26 | 2020-05-26 | Lightning protection device for power supply and high-speed differential signal multiplexing interface |
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| Country | Link |
|---|---|
| CN (1) | CN212012139U (en) |
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- 2020-05-26 CN CN202020909402.4U patent/CN212012139U/en active Active
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