CN111147106B - Coaxial line power supply device and method - Google Patents
Coaxial line power supply device and method Download PDFInfo
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- CN111147106B CN111147106B CN201911330585.2A CN201911330585A CN111147106B CN 111147106 B CN111147106 B CN 111147106B CN 201911330585 A CN201911330585 A CN 201911330585A CN 111147106 B CN111147106 B CN 111147106B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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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
- H02H3/08—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 current
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/548—Systems for transmission via power distribution lines the power on the line being DC
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/56—Circuits for coupling, blocking, or by-passing of signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5462—Systems for power line communications
- H04B2203/547—Systems for power line communications via DC power distribution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5462—Systems for power line communications
- H04B2203/5483—Systems for power line communications using coupling circuits
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Abstract
The invention discloses a coaxial power supply device and a method, which comprises a power supply end and a power receiving end, wherein a coaxial cable is connected between the output end of the power supply end and the input end of the power receiving end; the integrated power supply function on data communication's transmission line has used same root coaxial cable to realize data communication and transmission line power supply for data communication and power supply function mutual noninterference can automated inspection receive the electric end and adjust power supply state simultaneously, have realized that the automatic power supply of power supply end and receive the electric end is connected.
Description
Technical Field
The invention relates to the technical field of transmission line power supply, in particular to a coaxial line power supply device and method.
Background
The coaxial line is a guiding system formed by two coaxial cylindrical conductors, a broadband microwave transmission line with air or high-frequency medium filled between an inner conductor and an outer conductor sequentially comprises a protective sleeve, an outer conductor layer, an insulating medium layer and an inner conductor layer from outside to inside. The coaxial line has the advantages of strong anti-interference capability, stable data transmission, long transmission distance, low cost and the like, and is widely applied to the field of data communication. For example, an industrial image transmission bus CoaXPress bus which has the fastest transmission speed and is widely used at present uses a standard 75-ohm coaxial cable for transmission, and is rapidly popularized in the fields of machine vision, medical treatment, security and the like due to the advantages of high bandwidth, low cost, long transmission distance and the like.
However, the coaxial line is used for power supply and data communication less conventionally, on one hand, the used extra power supply equipment increases the system cost and complexity, on the other hand, the simple coaxial line is often used for power supply, and if cable short circuit or equipment mis-plugging occurs, the risk of equipment damage and fire hazard is brought. The demand for coaxial line power supply devices is therefore increasingly stringent.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a coaxial power supply device and a coaxial power supply method, which realize data communication and transmission line power supply by using the same coaxial cable, so that the data communication and the power supply function are not interfered with each other.
The invention provides a coaxial power supply device, which comprises a power supply end and a power receiving end, wherein a coaxial cable is connected between the output end of the power supply end and the input end of the power receiving end;
the power supply end comprises a power supply module, a power supply detection module and a power supply control module, wherein the power supply detection module is used for detecting the output voltage/current of the power supply module, the power supply control module is used for controlling the power supply mode of the power supply module, the power supply mode comprises a power-off mode, a searching mode and a normal power supply mode, and the output end of the power supply module is connected with the power receiving end through a coaxial cable.
Furthermore, the power supply module comprises an equipment power supply, an overcurrent protection unit, a switch unit, a voltage conversion unit for outputting a first specified voltage value and a search voltage generation unit for outputting a second specified voltage value; the output end of the equipment power supply is connected with the input end of the overcurrent protection unit, the output end of the overcurrent protection unit is connected with the voltage conversion unit, the output end of the voltage conversion unit is respectively connected with the input end of the search voltage generation unit and the input end of the switch unit, and the output end of the search voltage generation unit is connected with the input end of the switch unit.
Further, the power supply detection module comprises a current detection unit and a voltage detection unit; the input end of the current detection unit is connected with the output end of the voltage conversion unit, the output end of the current detection unit is connected with the input end of the power supply control module, the input end of the voltage detection unit is connected with the output end of the switch unit, and the output end of the voltage detection unit is connected with the input end of the power supply control module.
Further, the search voltage generating unit includes a PNP triode and an NPN triode, an input terminal of the PNP triode is connected to the output terminal of the voltage converting unit, an output terminal of the PNP triode is connected to the input terminal of the NPN triode, and an output terminal of the NPN triode is connected to the input terminal of the switching unit.
Furthermore, the power-off mode is interactively connected with the searching mode, the searching mode is interactively connected with the normal power supply mode, and the output end of the normal power supply mode is connected with the input end of the power-off mode.
Furthermore, the power supply end and the power receiving end are both coupled and connected with the coaxial cable through a direct current path and an alternating current path;
the direct current coupling interface is used for power supply of a transmission line between the power supply end and the power receiving end, and the alternating current coupling interface is used for signal communication between the power supply end and the power receiving end.
Furthermore, an input induction resistor for searching and detecting the power receiving end is arranged on the direct-current coupling interface of the power receiving end;
each cable in the coaxial cables simultaneously realizes data communication and power supply of the transmission line, and the two cables are not interfered with each other.
Furthermore, the overcurrent protection unit is a resettable fuse.
A coaxial line power supply method, comprising:
the power supply control module controls the power supply module to start, and the power supply module enters a search mode from a power-off mode;
the power supply module is connected with the power receiving end through a coaxial cable, an input induction resistance value of the power receiving end is calculated according to an output voltage change value detected by the power supply detection module, and when the input induction resistance value is equal to a set resistance value, the power supply control module controls the power supply module to enter a normal power supply mode from a search mode;
when the power supply detection module detects that the output current of the power supply module is smaller than a second specified current value, the power supply control module controls the power supply module to enter a search mode from a normal power supply mode;
when the power supply detection module detects that the output current of the power supply module exceeds the tripping protection current of the overcurrent protection unit, the power supply control module controls the power supply module to enter a power-off mode from a normal power supply mode/a search mode.
A computer readable storage medium having stored thereon a number of get classification programs for being invoked by a processor and performing the steps of:
the power supply control module controls the power supply module to start, and the power supply module enters a search mode from a power-off mode;
the power supply module is connected with the power receiving end through a coaxial cable, an input induction resistance value of the power receiving end is calculated according to an output voltage change value detected by the power supply detection module, and when the input induction resistance value is equal to a set resistance value, the power supply control module controls the power supply module to enter a normal power supply mode from a search mode;
when the power supply detection module detects that the output current of the power supply module is smaller than a second specified current value, the power supply control module controls the power supply module to enter a search mode from a normal power supply mode;
when the power supply detection module detects that the output current of the power supply module exceeds the tripping protection current of the overcurrent protection unit, the power supply control module controls the power supply module to enter a power-off mode from a normal power supply mode/a search mode.
The coaxial line power supply device and the method provided by the invention have the advantages that: according to the coaxial power supply device and the method provided by the structure, the power supply function is integrated on the transmission line of data communication, each cable in the coaxial cables simultaneously realizes data communication and transmission line power supply, two cables are not interfered with each other, so that the data communication and power supply functions are not interfered with each other, the coaxial power supply can realize the data communication and power supply functions by using a single cable, the flexibility and compatibility of an interconnection system can be greatly improved, and the difficulty and cost of wiring are reduced; therefore, the transmission line power supply is realized by using the same coaxial cable under the condition of not interfering high-speed data communication, and meanwhile, the power receiving end can be automatically detected and the power supply state can be adjusted, so that the automatic power supply connection between the power supply end and the power receiving end is realized.
Drawings
Fig. 1 is a schematic structural diagram of a coaxial power supply device according to the present invention;
FIG. 2 is a schematic diagram of an embodiment of a coaxial power supply apparatus;
FIG. 3 is a power supply mode relationship diagram of a power supply module;
the power supply device comprises a power supply end 100, a power supply module 110, a device power supply 111, an overcurrent protection unit 112, a voltage conversion unit 113, a search voltage generation unit 114, a switch unit 115, a PNP triode 116, an NPN triode 117, a first switch 118, a second switch 119, a first inductor 141, a first capacitor 142, an output induction resistor 143, a power supply detection module 120, a current detection unit 121, a voltage detection unit 122, a power supply control module 130, a coaxial cable 200, a power receiving end 300, a second inductor 301, a second capacitor 302 and an input induction resistor 303.
Detailed Description
The present invention is described in detail below with reference to specific embodiments, and in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Referring to fig. 1 to 3, the coaxial power supply apparatus according to the present invention includes a power supply end 100 and a power receiving end 300, wherein a coaxial cable 200 is connected between an output end of the power supply end 100 and an input end of the power receiving end 300; the power supply terminal 100 includes a power supply module 110, a power supply detection module 120 for detecting an output voltage/current of the power supply module 110, and a power supply control module 130 for controlling a power supply mode of the power supply module 110, where the power supply mode includes a power-off mode, a search mode, and a normal power supply mode, and an output terminal of the power supply module 110 is connected to the power receiving terminal 300 through the coaxial cable 200.
The power supply module 110 is connected to the power receiving terminal 300 through the coaxial cable 200 and provides power to the power receiving terminal 300, the power supply detection module 120 detects the state of the power supply module 110 and transmits the state to the power supply control module 130, and the power supply control module 130 adjusts the power supply module 110 to switch among the power-off mode, the search mode and the normal power supply mode. The power-off mode is interactively connected with the searching mode, the searching mode is interactively connected with the normal power supply mode, and the output end of the normal power supply mode is connected with the input end of the power-off mode.
The method comprises the steps that a power supply function is integrated on a transmission line of data communication, and specifically, a power supply end 100 and a power receiving end 300 are both coupled and connected with a coaxial cable 200 through direct current and alternating current; the dc coupling interface is used for supplying power to the transmission line between the power supply terminal 100 and the power receiving terminal 300, and the ac coupling interface is used for signal communication between the power supply terminal 100 and the power receiving terminal 300. Each cable in the coaxial cable 200 simultaneously realizes data communication and power supply of the transmission line, and the two cables do not interfere with each other; the data communication and power supply functions are not interfered with each other, the coaxial line is used for supplying power, the data communication and power supply functions can be realized by using a single cable, the flexibility and compatibility of an interconnection system can be greatly improved, and the difficulty and cost of wiring are reduced.
Meanwhile, the dc coupling interface of the power receiving terminal 300 is provided with an input sense resistor having a specific value, and the input sense resistor is used for searching and detecting the power receiving terminal 300. The power supply control module 130 can calculate an input induced resistance value of the power receiving terminal 300 according to the output voltage variation detected by the power supply detection module 120, and when the resistance value is equal to the set resistance value, the power supply control module 130 controls the power supply module 110 to enter the normal power supply mode from the search mode.
As shown in fig. 1 and 2, the power supply module 110 includes an apparatus power supply 111, an overcurrent protection unit 112, a switch unit 115, a voltage conversion unit 113 for outputting a first specified voltage value, and a search voltage generation unit 114 for outputting a second specified voltage value; the output end of the device power supply 111 is connected with the input end of the overcurrent protection unit 112, the output end of the overcurrent protection unit 112 is connected with the voltage conversion unit 113, the output end of the voltage conversion unit 113 is respectively connected with the input end of the search voltage generation unit 114 and the input end of the switch unit 115, and the output end of the search voltage generation unit 114 is connected with the input end of the switch unit 115.
The overcurrent protection unit 112 is a resettable fuse and is configured to implement overcurrent trip protection, and when the output current of the power supply module 110 exceeds the trip protection current of the overcurrent protection unit 112, the power supply control module 130 controls the power supply module 110 to enter a power-off mode from a normal power supply mode/a search mode; the switching unit 115 controls a power supply mode of the power supply module 110 through the power supply control module 130.
When the power supply module 110 is in the power-off mode, the output voltage is equal to zero; in the searching mode, the output voltage is smaller than a second specified voltage value, the output current does not exceed a first specified current value, and the first specified current value is obtained by calculating the second specified voltage value; and outputting a first specified voltage value in the normal power supply mode.
As shown in fig. 1 and 2, the power supply detection module 120 includes a current detection unit 121 and a voltage detection unit 122; the input end of the current detection unit 121 is connected to the output end of the voltage conversion unit 113, the output end is connected to the input end of the power supply control module 130, the input end of the voltage detection unit 122 is connected to the output end of the switch unit 115, and the output end is connected to the input end of the power supply control module 130.
The current detection unit 121 is configured to detect an output current of the power supply module 110, and the voltage conversion unit is configured to detect an output voltage of the power supply module 110.
As shown in fig. 2, the search voltage generating unit 114 includes a PNP transistor 116 and an NPN transistor 117, an input terminal of the PNP transistor 116 is connected to the output terminal of the voltage converting unit 113, an output terminal of the PNP transistor 116 is connected to an input terminal of the NPN transistor 117, and an output terminal of the NPN transistor 117 is connected to an input terminal of the switching unit 115.
A coaxial line power supply method, comprising:
s100: the power supply control module 130 controls the power supply module 110 to start, and the power supply module 110 enters a search mode from a power-off mode;
s200: connecting the power supply terminal 100 and the power receiving terminal 300 through the coaxial cable 200, calculating an input induced resistance value of the power receiving terminal 300 according to the output voltage variation value detected by the power supply detection module 120, and controlling the power supply module 110 to enter a normal power supply mode from a search mode when the input induced resistance value is equal to a set resistance value by the power supply control module 130;
s300: when the power supply detection module 120 detects that the output current of the power supply module 110 is smaller than the second specified current value, the power supply control module 130 controls the power supply module 110 to enter the search mode from the normal power supply mode;
s400: when the power supply detection module 120 detects that the output current of the power supply module 110 exceeds the trip protection current of the overcurrent protection unit 112, the power supply control module 130 controls the power supply module 110 to enter the power-off mode from the normal power supply mode/search mode.
For a trip power failure, the overcurrent protection unit 112 is automatically reset, and after a fault is discharged, the step S100 can be re-entered to enter a search mode. Or the power supply control module 130 controls the power supply module 110 to directly enter the power-off mode from the normal power supply mode/search mode to turn off the power supply mode.
As shown in fig. 2, for the present embodiment, the equipment power supply 111 of the power supply device is powered by +12V dc, the over-current protection unit 112 is a resettable fuse, the holding current is 1.5A, and the trip current is 3A; the voltage conversion unit 113 is a DC/DC converter, the search voltage generation unit 114 includes a PNP transistor 116, an NPN transistor 117, and a resistor network, and the switch unit 115 includes a first switch 118 and a second switch 119. The power supply detection module 120 is implemented by two ADCs (121, 122) to detect current and voltage respectively. The resistance value of the input sensing resistor 303 of the dc coupling interface of the power receiving terminal 300 is 4.7k Ω. The first specified voltage value output by the voltage conversion unit 113 is +24V, the first specified current value is 1mA, the second specified voltage value output by the search voltage generation unit 114 is +6.5V, the second specified current value is 8mA, and both the first specified current value and the second specified current value are preset values.
The coaxial cable interfaces of the power supply terminal 100 and the power receiving terminal 300 both adopt a dc and ac coupling manner, and respectively adopt the first inductor 141, the first capacitor 142, the second inductor 301 and the second capacitor 302 to perform dc and ac coupling, and the selection of the coupling inductor and the capacitor is determined by the frequency of the high-speed signal. The direct current and alternating current coupling interfaces are respectively used for power supply signal (transmission line power supply) connection and high-speed communication signal (data communication) connection, and the direct current and alternating current coupling interfaces are not interfered with each other.
The device power supply 111 provides +12V dc power, and the dc power passes through the overcurrent protection unit 112 and then is input to the voltage conversion unit 113, converted into +24V dc voltage, and input to the search voltage generation unit 114.
When the first switch 118 is closed and the second switch 119 is opened, the output voltage of the power supply module 110 is +24V, and the power supply module 110 operates in a normal power supply mode; when the first switch 118 is turned off and the second switch 119 is turned on, the NPN transistor 117 is turned on to provide a ground path to the base of the PNP transistor 116, so that the PNP transistor 116 is also turned on, and finally, the transistor 116 and the transistor 117 are both turned on, and the power supply module 110 operates in the search mode. The +24V voltage produces a search voltage of about 6.5V under the partial pressure of the 27k Ω and 10 k Ω resistors, and its maximum current does not exceed 24V/27k Ω ≈ 0.89 mA.
When the second switch 119 is turned off, the PNP transistor 116 and the NPN transistor 117 are also turned off, and the search voltage generating unit 114 cannot output a voltage and a current to the outside.
When the power receiving terminal 300 is not plugged or the input sense resistor of the plugged power receiving terminal 300 is not equal to the set resistance, the output voltage of the search voltage generating unit 114 is about +6.49V, which is smaller than the second specified voltage value +6.5V, according to the calculation of the resistance of the divider resistor. When the power receiving terminal 300 is plugged, the output voltage of the search voltage generating unit 114 is lower than +6.49V due to the parallel effect of the input sensing resistor 303; when the coaxial cable 200 or the power receiving end 300 is short-circuited, the output current of the search voltage generating unit 114 is the maximum, about 0.89mA, which is smaller than the first specified current value 1 mA; when the first switch 118 and the second switch 119 are both turned off, the power supply module 110 does not provide the output voltage and operates in the power-off mode.
The direct current coupling interface of the power supply terminal 100 is connected in series with an output sensing resistor 143, the resistance value is 100m Ω, the positive and negative terminals of the ADC of the current detection unit 121 are connected to the two ends of the sensing resistor 143, and the output current of the power supply module 100 is calculated by measuring the voltage drop across the sensing resistor 143 and dividing by the resistance value; the ADC positive and negative terminals of the voltage detection module 122 are respectively connected to the output terminal of the power supply module 110 and the ground, so as to measure the output voltage of the power supply module 110.
The switching process of the power supply module 110 between the power supply modes (power-off mode, search mode, and normal power supply mode) is as follows:
1) in the initial state, the power supply module 110 operates in the power-off mode, and both the first switch 118 and the second switch 119 are turned off and do not provide the power supply voltage;
2) when the power supply control module 130 sends a start command to the switch unit 115, the first switch 118 is turned off, the second switch 119 is turned on, and the power supply module 110 operates in the search mode;
3) when the power supply control module 130 sends a stop command to the switch unit 115, the first switch 118 and the second switch 119 are both turned off, and the power supply module 110 operates in the power-off mode;
4) when the power supply module 110 works in the search mode, the voltage detection module 122 continuously detects the output voltage of the power supply module 110, and when the voltage value changes, it is determined that the power receiving terminal 300 is plugged, and the induced resistance value of the input induction resistor 303 of the plugged power receiving terminal 300 can be calculated according to the voltage value: if the sensing resistance value is consistent with the resistance value of the input sensing resistor 4.7k Ω (set resistance value), the power supply control module 130 controls the second switch 119 to be turned off, the first switch 118 is turned on, and the power supply module 110 enters the normal power supply mode 403; if the sensing resistance value does not conform to the resistance value of 4.7k Ω, the power supply mode of the power supply module 110 is unchanged;
5) when the power supply module 110 operates in the normal power supply mode, the current detection unit 121 continuously detects the output current of the power supply module 110, and when the current value of the output current is smaller than the second specified current value 8mA, it is determined that the power receiving terminal 300 is removed, the power supply control module 130 controls the first switch 118 to be opened, the second switch 119 to be closed, and the power supply module 110 enters the search mode;
6) when the power supply module 110 works in the search mode or the normal power supply mode, the power supply detection module 120 continuously detects the output current and the output voltage of the power supply module 110, when the current value of the output current is less than 0.5mA and the voltage value of the output voltage is less than 1V, it is considered that the overcurrent trip occurs in the resettable fuse of the overcurrent protection unit 112, the power supply control module controls the first switch 118 and the second switch 119 to be switched off, the power supply module 110 enters the power-off mode, and can receive the start command of the power supply control module 130 again after waiting for more than 10 seconds, and the time of waiting for more than 10 seconds is used for the self-recovery of the resettable fuse.
A computer readable storage medium having stored thereon a number of get classification programs for being invoked by a processor and performing the steps of:
the power supply control module 130 controls the power supply module 110 to start, and the power supply module 110 enters a search mode from a power-off mode;
connecting the power supply terminal 100 and the power receiving terminal 300 through the coaxial cable 200, calculating an input induced resistance value of the power receiving terminal 300 according to the output voltage variation value detected by the power supply detection module 120, and controlling the power supply module 110 to enter a normal power supply mode from a search mode when the input induced resistance value is equal to a set resistance value by the power supply control module 130;
when the power supply detection module 120 detects that the output current of the power supply module 110 is smaller than the second specified current value, the power supply control module 130 controls the power supply module 110 to enter the search mode from the normal power supply mode;
when the power supply detection module 120 detects that the output current of the power supply module 110 exceeds the trip protection current of the overcurrent protection unit 112, the power supply control module 130 controls the power supply module 110 to enter the power-off mode from the normal power supply mode/search mode.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A coaxial line power supply device is characterized by comprising a power supply end (100) and a power receiving end (300), wherein a coaxial cable (200) is connected between the output end of the power supply end (100) and the input end of the power receiving end (300);
the power supply terminal (100) comprises a power supply module (110), a power supply detection module (120) for detecting the output voltage/current of the power supply module (110) and a power supply control module (130) for controlling the power supply mode of the power supply module (110), wherein the power supply mode comprises a power-off mode, a searching mode and a normal power supply mode, and the output end of the power supply module (110) is connected with the power receiving terminal (300) through a coaxial cable (200);
the power supply module (110) comprises an equipment power supply (111), an overcurrent protection unit (112), a switch unit (115), a voltage conversion unit (113) for outputting a first specified voltage value and a search voltage generation unit (114) for outputting a second specified voltage value;
the output end of the equipment power supply (111) is connected with the input end of the overcurrent protection unit (112), the output end of the overcurrent protection unit (112) is connected with the voltage conversion unit (113), the output end of the voltage conversion unit (113) is respectively connected with the input end of the search voltage generation unit (114) and the input end of the switch unit (115), and the output end of the search voltage generation unit (114) is connected with the input end of the switch unit (115);
when the power supply detection module (120) detects that the output current of the power supply module (110) is smaller than a second specified current value, the power supply control module (130) controls the power supply module (110) to enter a search mode from a normal power supply mode.
2. The coaxial line power supply device according to claim 1, wherein the power supply detection module (120) comprises a current detection unit (121) and a voltage detection unit (122);
the input end of the current detection unit (121) is connected with the output end of the voltage conversion unit (113), the output end of the current detection unit is connected with the input end of the power supply control module (130), the input end of the voltage detection unit (122) is connected with the output end of the switch unit (115), and the output end of the voltage detection unit is connected with the input end of the power supply control module (130).
3. The coaxial power supply device according to claim 1, wherein the search voltage generating unit (114) comprises a PNP transistor (116) and an NPN transistor (117), an input terminal of the PNP transistor (116) is connected to the output terminal of the voltage converting unit (113), an output terminal of the PNP transistor (116) is connected to an input terminal of the NPN transistor (117), and an output terminal of the NPN transistor (117) is connected to an input terminal of the switching unit (115).
4. The coaxial power supply apparatus of claim 1, wherein the power-off mode is interactively connected to the search mode, the search mode is interactively connected to the normal power mode, and the output of the normal power mode is connected to the input of the power-off mode.
5. The coaxial line power supply device according to any one of claims 1 to 4, wherein the power supply end (100) and the power receiving end (300) are both coupled with the coaxial line (200) through DC and AC;
the direct current coupling interface is used for power supply of a transmission line between the power supply end (100) and the power receiving end (300), and the alternating current coupling interface is used for signal communication between the power supply end (100) and the power receiving end (300).
6. The coaxial power supply device according to claim 5, wherein the dc coupling interface of the power receiving terminal (300) is provided with an input sensing resistor for searching and detecting the power receiving terminal (300);
each cable in the coaxial cable (200) realizes data communication and transmission line power supply simultaneously, and the two cables do not interfere with each other.
7. The coaxial line power supply device according to any of claims 1 to 4, wherein the over-current protection unit (112) is a resettable fuse.
8. A coaxial line power supply method, comprising:
the power supply control module (130) controls the power supply module (110) to start, and the power supply module (110) enters a search mode from a power-off mode;
the power supply terminal (100) and the power receiving terminal (300) are connected through a coaxial cable (200), an input induction resistance value of the power receiving terminal (300) is calculated according to an output voltage change value detected by the power supply detection module (120), and when the input induction resistance value is equal to a set resistance value, the power supply control module (130) controls the power supply module (110) to enter a normal power supply mode from a search mode;
when the power supply detection module (120) detects that the output current of the power supply module (110) is smaller than a second specified current value, the power supply control module (130) controls the power supply module (110) to enter a search mode from a normal power supply mode;
when the power supply detection module (120) detects that the output current of the power supply module (110) exceeds the trip protection current of the overcurrent protection unit (112), the power supply control module (130) controls the power supply module (110) to enter the power-off mode from the normal power supply mode/the search mode.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a program for being called by a processor and executing the steps of:
the power supply control module (130) controls the power supply module (110) to start, and the power supply module (110) enters a search mode from a power-off mode;
the power supply terminal (100) and the power receiving terminal (300) are connected through a coaxial cable (200), an input induction resistance value of the power receiving terminal (300) is calculated according to an output voltage change value detected by the power supply detection module (120), and when the input induction resistance value is equal to a set resistance value, the power supply control module (130) controls the power supply module (110) to enter a normal power supply mode from a search mode;
when the power supply detection module (120) detects that the output current of the power supply module (110) is smaller than a second specified current value, the power supply control module (130) controls the power supply module (110) to enter a search mode from a normal power supply mode;
when the power supply detection module (120) detects that the output current of the power supply module (110) exceeds the trip protection current of the overcurrent protection unit (112), the power supply control module (130) controls the power supply module (110) to enter the power-off mode from the normal power supply mode/the search mode.
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