CN117118054B - Dual-power supply protection device - Google Patents
Dual-power supply protection device Download PDFInfo
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- CN117118054B CN117118054B CN202311369507.XA CN202311369507A CN117118054B CN 117118054 B CN117118054 B CN 117118054B CN 202311369507 A CN202311369507 A CN 202311369507A CN 117118054 B CN117118054 B CN 117118054B
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- 230000009977 dual effect Effects 0.000 claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims description 24
- 230000002441 reversible effect Effects 0.000 claims description 11
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- 239000003985 ceramic capacitor Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 5
- 230000001052 transient effect Effects 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 abstract description 5
- 238000013461 design Methods 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 230000005856 abnormality Effects 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
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- 230000008054 signal transmission Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/207—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage also responsive to under-voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- Emergency Protection Circuit Devices (AREA)
Abstract
The embodiment of the application provides a dual power supply protection device, which comprises: the power supply system comprises a POE power supply input unit, a POE power supply output unit, a direct current power supply input unit, a direct current power supply output unit and a switching protection unit, wherein the switching protection unit receives a power supply switching trigger signal output by the POE power supply output unit or the direct current power supply output unit, controls the connection state between the POE power supply output unit or the direct current power supply output unit and powered equipment, and performs overvoltage and undervoltage protection on a power supply signal output by the POE power supply output unit or the direct current power supply output unit. The POE and DC two-way power supply interface can be connected simultaneously, and the situation that two-way power supply sources supply power simultaneously to cause consumption or mutual interference can be avoided through switching the protection unit. When the main circuit power supply operates, the auxiliary circuit power supply is automatically cut off, and the auxiliary circuit power supply can automatically switch operation only when the main circuit power supply is powered down or abnormal. Meanwhile, overvoltage and undervoltage protection can be provided, and normal operation of power supply is guaranteed.
Description
Technical Field
The application relates to the field of power supply protection, in particular to a double-power supply protection device.
Background
In the vehicle-road cloud integrated system, power supply of C-V2X equipment currently comprises POE and DC direct current power supply modes. Usually, only one power supply mode is adopted in planning in the early stage of project design, and the design is reserved in the other power supply mode. In special cases, two-way power supply can be adopted, but the two-way power supply is connected through an anti-reflection diode, so as to avoid the condition that the two-way power supply is possibly interfered, or to save the cost, the construction connection is only provided with one power supply.
The roadside V2X device may have unstable or abnormal power supply due to various factors during construction debugging or long-term outdoor environment operation, so that an input protection circuit is generally required. One possible protection circuit scheme is an input protection circuit built based on an integrated chip, such as a fuse chip or a hot plug controller chip. However, for some high-power-consumption V2X devices, such as MEC edge computers, thunder and vision integrated computers and the like, the scheme is not as flexible as discrete device design in terms of cost selection, wide voltage input range, high current overcurrent capacity, outdoor environment lightning surge pulse interference, protection function types, design difficulty, compatibility and the like. For example, 9V-36V, 8A wide input range capability may be required for a roadside MEC, and most of these chips on the market can be adapted for DC12V systems, which alone may result in limited choice. Or the basic functions of high current, lightning surge and the like are realized by matching with a larger discrete device. The integrated chip which can be compatible with reverse connection prevention and overvoltage and undervoltage prevention is not good in shape selection, and the design is relatively complex. The clamp filtering for transient interference still needs to be realized by matching with a discrete device so as to meet the application scene of a road side, and the clamp filtering can resist short-time interference, but is not applicable to frequent system outage.
Another possible solution is that the lightning surge, electrostatic pulse and reverse connection prevention functions are realized by discrete devices, but the functions of overvoltage and undervoltage protection and adjustable input voltage range are monitored by the MCU processor. However, for the road side MEC, constant power supply is required to be independently operated for a long term, the difficulty of updating and maintaining a software program is increased by introducing the MCU, the updating program of the brush machine cannot be frequently and manually assembled and disassembled, and the design difficulty and human resources are increased even if OTA is remotely updated.
Disclosure of Invention
In order to solve one of the technical defects, a dual-power protection device is provided in an embodiment of the present application.
The embodiment of the application provides a dual power supply protection device, which comprises:
the POE power supply input unit is connected with POE power supply equipment, and outputs a power supply signal output by the POE power supply equipment to the POE power supply output unit after lightning protection surge treatment;
the POE power supply output unit receives the power supply signal output by the POE power supply input unit and outputs the power supply signal to the power receiving equipment;
the direct-current power supply input unit is connected with the direct-current power supply equipment and outputs a power supply signal output by the direct-current power supply equipment to the direct-current power supply output unit after lightning protection surge treatment;
the direct current power supply output unit receives the power supply signal output by the direct current power supply input unit, filters the power supply signal and outputs the power supply signal to the power receiving equipment;
the switching protection unit is used for receiving the power supply switching trigger signal output by the POE power supply output unit, controlling the connection state between the direct current power supply output unit and the powered equipment, and performing overvoltage and undervoltage protection on the power supply signal output by the direct current power supply output unit; or, receiving a power supply switching trigger signal output by the direct current power supply output unit, controlling the connection state between the POE power supply output unit and the powered equipment, and performing overvoltage and undervoltage protection on the power supply signal output by the POE power supply output unit.
By adopting the dual-power supply protection device provided by the embodiment of the application, POE and DC two-way power supply interfaces can be connected simultaneously, and the situation that two-way power supply sources supply power simultaneously to cause consumption or mutual interference can be avoided by switching the protection unit. When the main circuit power supply operates, the auxiliary circuit power supply is automatically cut off, and the auxiliary circuit power supply can automatically switch operation only when the main circuit power supply is powered down or abnormal. Meanwhile, overvoltage and undervoltage protection can be provided, and normal operation of power supply is guaranteed. In addition, when realizing dual power supply protection, the application does not need to adopt software program, is particularly suitable for the C-V2X equipment which needs to be independently operated on an outdoor road side rod without power off for a long time, and avoids the risk of frequently replacing power supply equipment, interfaces or redesigning when abnormality occurs in the later stage or the requirement is not met after the road side equipment is constructed, installed and connected.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
fig. 1 is a schematic diagram of a dual power supply protection device according to embodiment 1 of the present application;
fig. 2 is a circuit diagram of a pulse group filtering circuit according to embodiment 1 of the present application;
fig. 3 is a circuit diagram of a switching protection unit provided in embodiment 1 of the present application;
fig. 4 is a schematic diagram of a dual power protection device according to embodiment 2 of the present application.
Detailed Description
In order to make the technical solutions and advantages of the embodiments of the present application more apparent, the following detailed description of exemplary embodiments of the present application is given with reference to the accompanying drawings, and it is apparent that the described embodiments are only some of the embodiments of the present application and not exhaustive of all the embodiments. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
Example 1
As shown in fig. 1, the present embodiment proposes a dual power supply protection device, which includes:
the POE power supply input unit is connected with the POE power supply equipment, and outputs a power supply signal output by the POE power supply equipment to the POE power supply output unit after lightning protection surge treatment;
the POE power supply output unit receives the power supply signal output by the POE power supply input unit and outputs the power supply signal to the power receiving equipment;
the direct current power supply input unit is connected with the direct current power supply equipment and outputs a power supply signal output by the direct current power supply equipment to the direct current power supply output unit after lightning protection surge treatment;
the direct current power supply output unit receives the power supply signal output by the direct current power supply input unit, filters the power supply signal and outputs the power supply signal to the power receiving equipment;
and the switching protection unit is used for receiving the power supply switching trigger signal output by the POE power supply output unit, controlling the connection state between the direct current power supply output unit and the powered equipment, and performing overvoltage and undervoltage protection on the power supply signal output by the direct current power supply output unit.
Specifically, the dual power supply protection device provided in this embodiment uses the main path as POE power supply, and the auxiliary path as dc power supply mode for explanation. The dual power supply protection device can be divided into a high voltage area and a low voltage area. The upper part and the lower part of the left side, which are related to the ground of the shell, are high-voltage areas, wherein the high-voltage areas comprise POE power supply input units and direct current power supply input units. In the high-voltage area, the lightning protection surge treatment of the power supply signal can be realized. The low-voltage area is the left part on the right side and is the area after the power supply signal is protected by lightning surge, and the low-voltage area and the powered equipment share one GND (ground reference). The shell ground and the GND reference ground can be connected through a lightning protection resistor and capacitor so as to ensure the integrity of the ground plane and charge discharge.
In the high-voltage area, the POE power input unit of the present embodiment adopts an independent RJ45 connector and a portal filter, so as to facilitate the layout of the lightning protection filter circuit. In this embodiment, a first lightning protection filter circuit and a second lightning protection filter circuit are respectively arranged at the front end and the rear end of the network port filter. The dual lightning protection filter circuit can ensure that a stable power supply signal source is provided for the output of a follow-up power supply signal.
The first lightning protection filter circuit comprises a plurality of GDT gas discharge tubes. Wherein, each GDT gas discharge tube corresponds a set of RJ45 connector and net twine between the net gape filter. Generally, 4 networking wires are arranged between the RJ45 connector and the network port filter, so in the embodiment, the first lightning protection filter circuit correspondingly also has 4 GDT gas discharge tubes. The parasitic capacitance of the GDT gas discharge tube is only 1pF, and the GDT gas discharge tube has little influence on the signal transmission quality of giga-to-ten megamega-communications.
The second lightning protection filter circuit is arranged between the central tap of the network port filter and the POE power supply output unit and comprises a GDT gas discharge tube, an MOV piezoresistor, an ESD electrostatic protection element, a capacitor and a common mode inductor. The GDT gas discharge tube is connected with the MOV piezoresistor in series after the center tap of the network port filter, the serial structure of the GDT gas discharge tube and the MOV piezoresistor is connected with the MOV piezoresistor in parallel, then is connected with the serial structure of the ESD electrostatic protection element and the capacitor in parallel, and then is connected with the POE power supply output unit after being connected with the common mode inductor in series.
The POE power supply input unit integrally adopts an independent integrated module, so that the internal space of the equipment is conveniently and fully utilized, the occupation of the space of a PCB (printed circuit board) is reduced, and the overall system structure can be simplified.
For the direct current power supply input unit, the embodiment adopts a combination form of lightning protection surge and common mode filtering. Specifically, the direct current power supply input unit comprises a lightning surge prevention circuit and a high current common mode filter circuit. The lightning protection surge circuit is connected with the direct current power supply equipment to receive the power supply signal, inputs the power supply signal after lightning protection filtering treatment to the heavy current common mode filter circuit, and outputs the power supply signal to the direct current power supply output unit after common mode interference filtering treatment to the power supply signal.
More specifically, the lightning surge protection circuit comprises a GDT gas discharge tube, an MOV piezoresistor, an ESD electrostatic protection element and a Y capacitor. The GDT gas discharge tube is connected with the direct current power supply equipment and is connected with the MOV piezoresistor in series, and then is connected with the ESD electrostatic protection element and the Y capacitor in series. After positive and negative lines of the direct current power supply equipment are processed by the MOV piezoresistor connected in series through the GDT gas discharge tube, residual overvoltage and overcurrent are further processed through the ESD electrostatic protection element and the Y capacitor. And finally, the large-current common-mode filter circuit is connected in series to further filter common-mode interference, so that the direct-current power supply output unit in a low-voltage area is supplied.
In a low-voltage area, the anti-reverse connection protection circuit is arranged between the direct current power supply input unit and the direct current power supply output unit, so that the situation that the direct current power supply equipment is damaged due to the fact that the positive electrode and the negative electrode of the direct current power supply equipment are connected back when the V2X equipment is installed in a regulating and testing mode is avoided. The reverse connection preventing protection circuit of the embodiment can use the MOS tube based to build the classical reverse connection preventing circuit so as to increase the overcurrent and heat dissipation capacity, and the embodiment is not described in detail.
The present embodiment further provides a pulse group filter circuit at the rear end of the anti-reverse connection protection circuit. As shown in fig. 2, the pulse group filter circuit includes a ceramic capacitor C3, an electrolytic capacitor C4, and an inductor L1. The ceramic capacitor, the inductor and the electrolytic capacitor are sequentially connected in series to form the pi-shaped filter circuit, and specific parameters can be adjusted according to actual requirements. Residual pulse group transient interference can be effectively filtered out for the over-current and 18V-36V supply voltage in 8A, so that the direct current supply output unit outputs stable direct current supply, and the over-voltage and under-voltage protection mechanism of the subsequent switching protection unit can be prevented from being triggered by mistake.
Specifically, after the power supply signal output by the direct current power supply equipment is subjected to lightning protection surge treatment by the direct current power supply input unit, possible transient high voltage is controlled within 60V. The roadside V2X device needs to be operated with 18V to 36V of constant power supply for a long time under the outdoor roadside environment again, and thus needs to be further designed for electromagnetic compatibility. Sufficient resistance to short-term transient disturbances outside the 18V to 36V range is required to ensure that the system is stably powered for proper operation. Therefore, the pi-type filter circuit formed by sequentially connecting the ceramic capacitor, the inductor and the electrolytic capacitor in series is adopted in the embodiment to further filter and clamp 60V pulse interference in a normal working voltage range, and the ceramic capacitor can be arranged at the periphery to further stably optimize the electromagnetic compatibility of direct current power supply.
The POE power supply mode in the low-voltage area is divided into two paths. The output of the POE power supply output unit and the output of the direct current power supply output unit are combined and then connected into the power receiving equipment. The other path can provide a power supply switching trigger signal for the switching protection unit so that the switching protection unit controls the connection state between the direct current power supply output unit and the powered equipment, and the power supply mode of the current powered equipment is switched between the POE power supply mode and the direct current power supply mode.
The embodiment provides a mode that a POE power supply output unit provides a power supply switching trigger signal for a switching protection unit. The current limiting resistor and the single diode or the current limiting resistor can be connected in series between the POE power supply output unit and the switching protection unit, and the output signal can be used as a power supply switching trigger signal of the switching protection unit. If the two power supplies are simultaneously connected, when the main POE power supply is output, the POE power supply output unit outputs a power supply switching trigger signal to the switching protection unit so as to trigger the switching protection unit to cut off the secondary DC power supply. When the power supply of the main path POE is turned off, the switching protection unit can also restore the connection between the direct current power supply output unit and the powered equipment, so that the secondary path direct current power supply is restored.
Specifically, the switching protection unit provided in this embodiment is implemented by a pure discrete device circuit that does not require software real-time sampling. The switching protection unit is suitable for V2X equipment with overcurrent and 24V direct current supply voltage range within 8A. The over-voltage and under-voltage power supply protection range is 18V to 36V, and has the functions of preventing backflow to a main POE power supply path and triggering the power supply path switching by a POE power supply signal.
The switching protection unit comprises a current limiting protection circuit, a voltage dividing circuit and a switching circuit. The current-limiting protection circuit carries out current-limiting protection processing on the received power supply switching trigger signal and then inputs the power supply switching trigger signal into the voltage dividing circuit. The voltage dividing circuit divides the received output signal of the current limiting protection circuit and the received power supply signal and inputs the divided signals into the switching circuit. The switching circuit performs a switching operation according to the output signal of the voltage dividing circuit.
Specifically, as shown in fig. 3, the switching protection unit structure includes a resistor R1 and a diode D2. The voltage dividing circuit comprises a voltage stabilizing diode D4, resistors R3-R8, a triode Q2, a triode Q3 and a capacitor C2. The switching circuit comprises a voltage stabilizing diode D3, a capacitor C1, a resistor R2 and a MOS tube Q1. The positive pole of diode D2 connects POE power supply output unit, the one end of resistance R1 is connected to the negative pole of diode D2, the positive pole of zener diode D4 is connected to the other end of resistance R1, the one end of resistance R5 and the one end of electric capacity C2, the other end ground connection of electric capacity C2, the direct current power supply output unit is connected to the negative pole of zener diode D4, the one end of resistance R3, the negative pole of zener diode D3, the one end of electric capacity C1, the one end of resistance R2 and the source electrode of MOS transistor Q1, the one end of resistance R5 is connected to the one end of resistance R6 and the base electrode of triode Q2, the other end ground connection of resistance R6, the emitter ground connection of triode Q2, the other end of resistance R3, the one end of resistance R8 and the base electrode of triode Q3, the other end ground connection of resistance R7, the other end ground connection of resistance R4 the other end of resistance R2, the other end of resistance C1 and the drain electrode of MOS transistor Q1, the positive electrode of MOS transistor Q1 and the MOS transistor Q1 are connected to the other end of resistance C8. In the switching protection unit, the voltage drop of the base electrodes of the triodes Q2 and Q3 is 0.58V to 0.7V, the error of the voltage drop of the base electrodes of the triodes Q2 and Q3 is small, and the control precision is higher than that of the MOS transistor Q1. Specific circuits and device functions in the switching protection unit are described in detail below.
In the switching protection unit, the diode D2 is mainly used for preventing reverse current from being driven by reverse voltage of about 6V when only secondary dc power is supplied, and the voltage-dividing and current-limiting resistor R1 is provided for current limiting. And when the power supply of the main circuit POE is recovered to be normal, the base voltage of the triode Q2 can lead the triode Q2 to be conducted through the voltage division effect of the resistors R1, R5 and R6, so that the secondary circuit direct current power supply is turned off.
When the voltage output by the direct current power supply output unit is 18V, the voltage which is given to the triode Q3 after the voltage division effect of the voltage division resistors R3 and R8 is just the base electrode conduction voltage drop, so that when the power supply is lower than 18V, the triode Q3 is turned off. At this time, MOS transistor Q1 is turned off because vgs=0 (R7 is DNP empty). When the voltage output by the direct current power supply output unit is 36V, the triode Q2 is turned on, and then the triode Q3 is turned off. Finally, the MOS transistor Q1 is turned off (R7 is DNP empty) because vgs=0 (if the patch is provided, the system has no functions of under-voltage and over-voltage protection and adjustable voltage range).
In the switching protection unit, the power consumption of each resistor is not more than 0.05mW at maximum. The zener diode D3 is used for protecting the gate Vgs limit voltage of the MOS transistor Q1. The capacitor C1 is used for filtering anti-interference and avoiding misleading of the MOS tube Q1. The capacitor C2 is used for clamping, delaying and stably conducting the triode Q2, so that the phenomenon that power supply input supplies power again for a short time under the condition of high-voltage power failure and output burrs appear is avoided.
Furthermore, this embodiment is further provided with a power supply anti-backflow circuit, and the power supply anti-backflow circuit can be constructed in a suitable anti-backflow diode or MOS tube mode to perform anti-backflow circuit processing, and the selected device needs to ensure enough overcurrent and power, and polar reverse leakage current. The method mainly aims at avoiding direct current power supply output from flowing backwards into the switching protection unit after POE power supply is turned off, so that the direct current power supply output is turned off automatically.
The power supply anti-backflow circuit of the present embodiment includes a rectifier D1. The rectifier D1 is a high-current rectifier, has the characteristic of strong overcurrent capacity, and is more suitable for high-current scenes. The positive electrode of the rectifier D1 is connected with the POE power supply output unit, and the negative electrode of the rectifier D1 is connected with the drain electrode of the MOS tube Q1. The rectifier D1 considers that the POE power supply reverse current is blocked, namely after the POE power supply of the main path is cut off, the output of the auxiliary path direct current power supply output unit flows backward into the switching protection unit, the switching protection unit is prevented from being triggered to be switched off when the POE power supply is cut off, and the direct current power supply output is also automatically switched off, so that the direct current power supply is normally output to the powered equipment when the POE power supply is cut off.
By adopting the dual-power supply protection device provided by the embodiment of the application, POE and DC two-way power supply interfaces can be connected simultaneously, and the situation that two-way power supply sources supply power simultaneously to cause consumption or mutual interference can be avoided by switching the protection unit. When the main circuit power supply operates, the auxiliary circuit power supply is automatically cut off, and the auxiliary circuit power supply can automatically switch operation only when the main circuit power supply is powered down or abnormal. Meanwhile, overvoltage and undervoltage protection can be provided, and normal operation of power supply is guaranteed. In addition, when realizing dual power supply protection, the application does not need to adopt software program, is particularly suitable for the C-V2X equipment which needs to be independently operated on an outdoor road side rod without power off for a long time, and avoids the risk of frequently replacing power supply equipment, interfaces or redesigning when abnormality occurs in the later stage or the requirement is not met after the road side equipment is constructed, installed and connected.
Example 2
As shown in fig. 4, this embodiment proposes a dual power supply protection device, which is characterized in that the device includes:
the direct-current power supply input unit is connected with the direct-current power supply equipment and outputs a power supply signal output by the direct-current power supply equipment to the direct-current power supply output unit after lightning protection surge treatment;
the direct current power supply output unit receives the power supply signal output by the direct current power supply input unit, filters the power supply signal and outputs the power supply signal to the power receiving equipment;
the POE power supply input unit is connected with POE power supply equipment, and outputs a power supply signal output by the POE power supply equipment to the POE power supply output unit after lightning protection surge treatment;
the POE power supply output unit receives the power supply signal output by the POE power supply input unit and outputs the power supply signal to the power receiving equipment;
and the switching protection unit is used for receiving the power supply switching trigger signal output by the direct current power supply output unit, controlling the connection state between the POE power supply output unit and the powered equipment, and performing overvoltage and undervoltage protection on the power supply signal output by the POE power supply output unit.
Specifically, the dual-power supply protection device provided in this embodiment uses the main path as the dc power supply, and the auxiliary path as the power supply mode of POE power supply. Similar to the dual power protection device described in embodiment 1, the dual power protection device of this embodiment can be divided into a high voltage region and a low voltage region as well, as shown in fig. 4. The upper part and the lower part of the left side, which are related to the ground of the shell, are high-voltage areas, wherein the high-voltage areas comprise a direct current power supply input unit and a POE power supply input unit. In the high-voltage area, the lightning protection surge treatment of the power supply signal can be realized. The low-voltage area is the left part on the right side and is the area after the power supply signal is protected by lightning surge, and the low-voltage area and the powered equipment share one GND (ground reference). The shell ground and the GND reference ground can be connected through a lightning protection resistor and capacitor so as to ensure the integrity of the ground plane and charge discharge. The specific composition and principle of the dc power supply input unit, the dc power supply output unit, the POE power supply input unit, and the POE power supply output unit can be seen in detail in the technical solution described in embodiment 1, and there is no significant difference between this embodiment and the description.
In this embodiment, the switching protection unit is triggered by the power supply switching trigger signal output by the dc power supply output unit. The circuit configuration is the same as that of embodiment 1, and when the circuit is connected, only the two connection points of POE and DC in fig. 3 need to be reversed. Therefore, when the two paths of power supplies are simultaneously connected, if the main path of direct current power supply is output, the direct current power supply output unit outputs a power supply switching trigger signal to the switching protection unit so as to trigger the switching protection unit to cut off the power supply of the auxiliary path POE. When the main path direct current power supply is turned off, the switching protection unit can also restore the connection between the POE power supply output unit and the powered equipment, so that the auxiliary path POE power supply is restored.
In addition, this embodiment is provided with the power supply again and prevents flowing backward the circuit, when direct current power supply cuts off the back, avoids POE power supply output to flow backward to switch protection unit in, leads to POE power supply output to turn off by oneself.
By adopting the dual-power supply protection device provided by the embodiment of the application, POE and DC two-way power supply interfaces can be connected simultaneously, and the situation that two-way power supply sources supply power simultaneously to cause consumption or mutual interference can be avoided by switching the protection unit. When the main circuit power supply operates, the auxiliary circuit power supply is automatically cut off, and the auxiliary circuit power supply can automatically switch operation only when the main circuit power supply is powered down or abnormal. Meanwhile, overvoltage and undervoltage protection can be provided, and normal operation of power supply is guaranteed. In addition, when realizing dual power supply protection, the application does not need to adopt software program, is particularly suitable for the C-V2X equipment which needs to be independently operated on an outdoor road side rod without power off for a long time, and avoids the risk of frequently replacing power supply equipment, interfaces or redesigning when abnormality occurs in the later stage or the requirement is not met after the road side equipment is constructed, installed and connected.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.
In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may communicate with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (9)
1. A dual power protection device, the device comprising:
the POE power supply input unit is connected with POE power supply equipment, and outputs a power supply signal output by the POE power supply equipment to the POE power supply output unit after lightning protection surge treatment;
the POE power supply output unit receives the power supply signal output by the POE power supply input unit and outputs the power supply signal to the power receiving equipment;
the direct-current power supply input unit is connected with the direct-current power supply equipment and outputs a power supply signal output by the direct-current power supply equipment to the direct-current power supply output unit after lightning protection surge treatment;
the direct current power supply output unit receives the power supply signal output by the direct current power supply input unit, filters the power supply signal and outputs the power supply signal to the power receiving equipment;
the switching protection unit is used for receiving the power supply switching trigger signal output by the POE power supply output unit, controlling the connection state between the direct current power supply output unit and the powered equipment, and performing overvoltage and undervoltage protection on the power supply signal output by the direct current power supply output unit; or, receiving a power supply switching trigger signal output by the direct current power supply output unit, controlling the connection state between the POE power supply output unit and the powered equipment, and performing overvoltage and undervoltage protection on the power supply signal output by the POE power supply output unit;
the switching protection unit comprises a current-limiting protection circuit, a voltage division circuit and a switching circuit, wherein the current-limiting protection circuit inputs a received power supply switching trigger signal to the voltage division circuit after current-limiting protection treatment, the voltage division circuit inputs a received current-limiting protection circuit output signal and a received power supply signal to the switching circuit after voltage division treatment, and the switching circuit executes switching action according to the voltage division circuit output signal;
the current-limiting protection circuit comprises a resistor R1 and a diode D2, the voltage-dividing circuit comprises a voltage-stabilizing diode D4, resistors R3-R8, a triode Q2, a triode Q3 and a capacitor C2, the switching circuit comprises the voltage-stabilizing diode D3, the capacitor C1, the resistor R2 and a MOS transistor Q1, the positive electrode of the diode D2 is connected with a POE power supply output unit, the negative electrode of the diode D2 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with the positive electrode of the voltage-stabilizing diode D4, one end of the resistor R5 and one end of the capacitor C2 are grounded, the negative electrode of the voltage-stabilizing diode D4 is connected with one end of the resistor R3, the negative electrode of the voltage-stabilizing diode D3, one end of the capacitor C1, one end of the resistor R2 and the source electrode of the MOS transistor Q1, the other end of the resistor R5 is connected with one end of the resistor R6 and the base electrode of the triode Q2, the other end of the resistor R6 is grounded, the emitter of the diode Q2 is grounded, the other end of the triode Q2 is connected with the other end of the resistor R3 and the other end of the MOS transistor Q2 is connected with the collector electrode of the resistor R3, and the other end of the MOS transistor Q3 is connected with the collector electrode of the resistor Q3 and the other end of the MOS transistor Q1 is grounded, and the other end of the MOS transistor Q3 is connected with the other end of the resistor 3 is grounded.
2. The device according to claim 1, wherein the POE power supply input unit comprises an RJ45 connector and a portal filter, the RJ45 connector is connected with POE power supply equipment, and a first lightning protection filter circuit and a second lightning protection filter circuit are respectively arranged at the front end and the rear end of the portal filter.
3. The apparatus of claim 2, wherein the first lightning protection filter circuit comprises a plurality of GDT gas discharge tubes, each GDT gas discharge tube corresponding to a set of net wires between an RJ45 connector and a net mouth filter.
4. The device according to claim 2, wherein the second lightning protection filter circuit comprises a GDT gas discharge tube, an MOV varistor, an ESD electrostatic protection element, a capacitor and a common mode inductor, the GDT gas discharge tube is connected to the MOV varistor after the center tap of the network filter, the serial connection structure of the GDT gas discharge tube and the MOV varistor is connected in parallel with the MOV varistor, the serial connection structure of the ESD electrostatic protection element and the capacitor is connected in parallel with the common mode inductor, and the POE power supply output unit is connected in series with the common mode inductor.
5. The device according to claim 1, wherein the dc power supply input unit includes a lightning protection surge circuit and a heavy current common mode filter circuit, the lightning protection surge circuit is connected with the dc power supply device to receive a power supply signal, the power supply signal is input to the heavy current common mode filter circuit after lightning protection filter processing, and the heavy current common mode filter circuit outputs the power supply signal to the dc power supply output unit after common mode interference filter processing.
6. The device according to claim 5, wherein the surge protection circuit comprises a GDT gas discharge tube, an MOV varistor, an ESD electrostatic protection element, and a Y capacitor, and the GDT gas discharge tube is connected to a dc power supply and connected in series with the MOV varistor, and then connected in series with the ESD electrostatic protection element and the Y capacitor.
7. The apparatus of claim 1, wherein the dc power output unit includes a reverse connection preventing protection circuit and a pulse group filtering circuit, the reverse connection preventing protection circuit is connected to the dc power input unit, and the pulse group filtering circuit receives a power signal output by the dc power input unit after passing through the reverse connection preventing protection circuit and outputs the power signal after performing transient interference filtering processing.
8. The apparatus of claim 7, wherein the pulse-group filter circuit comprises a ceramic capacitor, an electrolytic capacitor, and an inductor, the ceramic capacitor, the inductor, and the electrolytic capacitor being serially connected in sequence to form a pi-type filter circuit.
9. The device according to claim 1, further comprising a power supply anti-backflow circuit, wherein the power supply anti-backflow circuit comprises a rectifier D1, a positive electrode of the rectifier D1 is connected with the POE power supply output unit, and a negative electrode of the rectifier D1 is connected with a drain electrode of the MOS transistor Q1.
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| CN117118054A (en) | 2023-11-24 |
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