CN112821573A - Device for supplying power to railway cable acquisition and transmission unit - Google Patents

Device for supplying power to railway cable acquisition and transmission unit Download PDF

Info

Publication number
CN112821573A
CN112821573A CN202110175694.2A CN202110175694A CN112821573A CN 112821573 A CN112821573 A CN 112821573A CN 202110175694 A CN202110175694 A CN 202110175694A CN 112821573 A CN112821573 A CN 112821573A
Authority
CN
China
Prior art keywords
resistor
super capacitor
transmission unit
electrically connected
acquisition
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110175694.2A
Other languages
Chinese (zh)
Inventor
缪弼东
宋东海
张玉平
艾广宁
饶洪伟
高峰
李�瑞
马进军
李曌宇
赵广智
李俊华
齐佳风
张斌
叶锐利
张峰
崔超
刘亚光
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Railway Electrification Engineering Group Co Ltd
Original Assignee
China Railway Electrification Engineering Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Railway Electrification Engineering Group Co Ltd filed Critical China Railway Electrification Engineering Group Co Ltd
Priority to CN202110175694.2A priority Critical patent/CN112821573A/en
Publication of CN112821573A publication Critical patent/CN112821573A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors

Abstract

The invention relates to a device for supplying power to a railway cable acquisition and transmission unit, which comprises a current transformer, a rectification and voltage stabilization module, a control module and a super capacitor, wherein the current transformer is connected with the rectification and voltage stabilization module; the current transformer is sleeved on the power supply cable, the output end of the current transformer is electrically connected with the input end of the rectification voltage stabilizing module, and the input end of the super capacitor is electrically connected with the output end of the rectification voltage stabilizing module; the output end of the super capacitor is electrically connected with the power supply end of the acquisition and transmission unit; the control module is connected in the super capacitor and the acquisition and transmission unit and used for controlling the charging and discharging of the super capacitor. According to the device for supplying power to the railway cable acquisition and transmission unit, the super capacitor is charged by sensing the current in the power supply cable, and then the super capacitor supplies power to the acquisition and transmission unit.

Description

Device for supplying power to railway cable acquisition and transmission unit
Technical Field
The invention relates to the field of railway power equipment, in particular to a device for supplying power to a railway cable acquisition and transmission unit.
Background
The temperature, electric current, voltage isoparametric of head need be measured and the transmission in the middle of the cable along the railway, but the cable is all installed in advance and is accomplished, can't directly get the electricity from the cable, in order to measure multiple data such as temperature, voltage, electric current to through internet of things, with data display platform, must solve and gather transmission unit power supply problem.
At present, the mode of providing power for the acquisition and transmission unit is mainly powered by a battery, and can also be realized by a power supply mode of charging the battery and a solar panel.
However, only a battery power supply mode is used, the battery needs to be replaced periodically, and the workload is large; the power supply mode of charging by the battery and the solar panel can avoid frequent replacement of the battery, but has higher requirements on the installation environment, and the railway line has strict requirements on external equipment, so that the battery and the solar panel type power supply cannot be realized in some areas.
Disclosure of Invention
In order to solve the technical problems, the invention provides a device for supplying power to a railway cable acquisition and transmission unit, wherein a super capacitor is charged by sensing current in a power supply cable, and then the super capacitor supplies power to the acquisition and transmission unit.
The technical scheme adopted by the invention for solving the technical problems is as follows: a device for supplying power to a railway cable acquisition and transmission unit comprises a current transformer, a rectification and voltage stabilization module, a control module and a super capacitor; the current transformer is sleeved on the power supply cable, the output end of the current transformer is electrically connected with the input end of the rectification voltage stabilizing module, and the input end of the super capacitor is electrically connected with the output end of the rectification voltage stabilizing module; the output end of the super capacitor is electrically connected with the power supply end of the acquisition and transmission unit; the control module is connected in the super capacitor and the acquisition and transmission unit and used for controlling the charging and discharging of the super capacitor.
Furthermore, a comparator and a switching tube are adopted in a circuit of the control module; the comparator is configured to: setting a first comparison voltage value for judging whether the super capacitor is fully charged or not, and setting a first comparison voltage value limited under discharge of the super capacitor; is further configured to: when the voltage value of the super capacitor is larger than the first comparison voltage value, controlling the switching tube to be conducted, and supplying power to the super capacitor; and when the voltage value of the super capacitor is smaller than the second comparison voltage value, the switching tube is controlled to be switched off, and the super capacitor is charged.
Further, the output end of the rectifying and voltage stabilizing module is also used for supplying power to the comparator.
Furthermore, a circuit of the rectifying and voltage-stabilizing module adopts a rectifier bridge, a voltage-stabilizing diode and a filter capacitor; the input end of the rectifier bridge is electrically connected with the output end of the current transformer; the current output by the current transformer is converted into direct current voltage after being processed by the rectifier bridge, the direct current voltage is stabilized by the voltage stabilizing diode, and then a stable direct current voltage signal is output by filtering of the filter capacitor and used for charging the super capacitor.
Furthermore, the comparator at least has a non-inverting input terminal, an output terminal and a reference voltage terminal; the circuit of the control module is at least provided with a super capacitor interface, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a capacitor and an acquisition and transmission unit interface; the first end of the super capacitor interface is electrically connected with the first end of the acquisition and transmission unit interface; the second end of the super capacitor interface is grounded, and the second end of the acquisition and transmission unit interface is connected with the D pole of the switching tube; the S pole of the switching tube is grounded; the first end of the first resistor is electrically connected with the first end of the super capacitor interface, the second end of the first resistor is electrically connected with the first end of the fourth resistor, and the second end of the fourth resistor is grounded; the first end of the second resistor is electrically connected with the first end of the super capacitor interface, and the second end of the second resistor is electrically connected with the first end of the third resistor; the second end of the third resistor is electrically connected with the first end of the fourth resistor; the in-phase input end of the comparator is electrically connected with the first end of the fourth resistor, the inverting input end of the comparator is electrically connected with the first end of the fifth resistor, the second end of the fifth resistor is electrically connected with the reference voltage end of the comparator, the output end of the comparator is respectively electrically connected with the G pole of the switch tube and the first end of the third resistor, a first comparison voltage value is provided for the comparator through the voltage division of the first resistor and the fourth resistor, and a second comparison voltage value is provided for the comparator through the voltage division of the second resistor, the third resistor and the fourth resistor.
Furthermore, the electric energy stored by the super capacitor needs to meet the requirement of power supply of data transmission of the acquisition and transmission unit at least once.
The invention has the advantages that: according to the device for supplying power to the railway cable acquisition and transmission unit, the super capacitor is charged by sensing the current in the power supply cable, and then the super capacitor supplies power to the acquisition and transmission unit, so that 24-hour charging can be realized due to the fact that the current is always in the power supply cable, the super capacitor is kept charged, and the time-sharing transmission of data of the acquisition and transmission unit is realized; the device is characterized in that the railway power supply cable generally has only a small current of about 5A, the device charges the super capacitor by sensing the small current in the power supply cable through the current transformer, the super capacitor can supply power to the acquisition and transmission unit in a time-sharing manner, and the acquisition and transmission unit at least completes data transmission once when supplying power once, so that the data transmission requirements of the acquisition and transmission unit of the railway cable are met; the adopted control module can avoid the overcharge and the over-discharge of the super capacitor by using a low-power consumption device in a circuit switching mode; the device is easy to install, does not need to be replaced regularly like a battery, does not need a mounting environment with higher requirements, and has good applicability and strong practicability.
Drawings
FIG. 1 is a schematic diagram of an apparatus for supplying power to a railway cable acquisition and transmission unit according to an embodiment;
fig. 2 is a schematic circuit diagram of a rectifying and voltage-stabilizing module of an apparatus for supplying power to a railway cable acquisition and transmission unit according to the present embodiment;
fig. 3 is a schematic circuit diagram of a control module of an apparatus for supplying power to a railway cable collection and transmission unit according to the embodiment.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
Examples
As shown in fig. 1 to 3, the present embodiment provides an apparatus for supplying power to a railway cable acquisition and transmission unit, which includes a current transformer, a rectifying and voltage-stabilizing module, a control module, and a super capacitor; the current transformer is sleeved on the power supply cable, the output end of the current transformer is electrically connected with the input end of the rectification voltage stabilizing module, and the input end of the super capacitor is electrically connected with the output end of the rectification voltage stabilizing module; the output end of the super capacitor is electrically connected with the power supply end of the acquisition and transmission unit; the control module is connected in the super capacitor and the acquisition and transmission unit and is used for controlling the charging and discharging of the super capacitor; the current transformer adopts a bayonet current transformer, is directly sleeved on a power supply cable, senses the current (about 5A generally) in the cable, and outputs a small current on the secondary side of the current transformer, which is about 1mA approximately; the device can charge the super capacitor by utilizing the small current of the power supply cable through the induction of the current transformer, and then supplies power for the acquisition and transmission unit in a time-sharing manner.
In the device for supplying power to the railway cable acquisition and transmission unit of the embodiment, a circuit of the control module adopts a comparator IC2 and a switching tube Q1; the comparator IC2 is configured to: setting a first comparison voltage value for judging whether the super capacitor is fully charged or not, and setting a first comparison voltage value limited under discharge of the super capacitor; is further configured to: when the voltage value of the super capacitor is larger than the first comparison voltage value, controlling the switching tube to be conducted, and supplying power to the super capacitor; and when the voltage value of the super capacitor is smaller than the second comparison voltage value, the switching tube is controlled to be switched off, and the super capacitor is charged.
In the device for supplying power to the railway cable acquisition and transmission unit of the embodiment, the output end of the rectifying and voltage-stabilizing module is also used for supplying power to the comparator IC 2.
In the device for supplying power to the railway cable acquisition and transmission unit of the embodiment, a circuit of a rectifying and voltage-stabilizing module adopts a rectifier bridge IC1, a voltage-stabilizing diode D1 and a filter capacitor EC 1; the input end of the rectifier bridge IC1 is electrically connected with the output end of the current transformer; the current output by the current transformer is converted into direct current voltage after being processed by a rectifier bridge IC1, the direct current voltage is stabilized by a voltage stabilizing diode D1, and then a stable direct current voltage signal is filtered and output by a filter capacitor EC1 and used for charging the super capacitor; the interface J1 is connected with the secondary side of the current transformer, and the output end of the interface J1 is connected with the input end of the rectifier bridge IC 1; and the circuit of the rectification voltage-stabilizing module is used for converting the secondary side current of the current transformer and transmitting the converted secondary side current to the circuit of the rectification voltage-stabilizing module to stabilize the voltage.
IN the apparatus for supplying power to the railway cable acquisition and transmission unit of the present embodiment, the comparator IC2 further has at least a non-inverting input terminal + IN, an inverting input terminal-IN, an output terminal OUT, and a reference voltage terminal REF; the circuit of the control module at least comprises a super capacitor interface CJDR, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a capacitor C1 and an acquisition and transmission unit interface CJDY; the first end of the super capacitor interface CJDR is electrically connected with the first end of the acquisition and transmission unit interface CJDY; the second end of the super capacitor interface CJDR is grounded, and the second end of the acquisition transmission unit interface CJDY is connected with a pin D of a switch tube Q1; the S pin of the switching tube Q1 is grounded; a first end of the first resistor R1 is electrically connected with a first end of the super capacitor interface CJDR, a second end of the first resistor R1 is electrically connected with a first end of the fourth resistor R4, and a second end of the fourth resistor R4 is grounded; a first end of the second resistor R2 is electrically connected with a first end of the super capacitor interface CJDR, and a second end of the second resistor R2 is electrically connected with a first end of the third resistor R3; a second end of the third resistor R3 is electrically connected with a first end of the fourth resistor R4; a non-inverting input terminal + IN of the comparator IC2 is electrically connected to a first terminal of the fourth resistor R4, an inverting input terminal-IN of the comparator IC2 is electrically connected to a first terminal of the fifth resistor R5, a second terminal of the fifth resistor R5 is electrically connected to a reference voltage terminal REF of the comparator IC2, an output terminal OUT of the comparator IC2 is electrically connected to the G pin of the switching tube Q1 and the first terminal of the third resistor R3, the comparator IC2 is provided with a first comparison voltage value through voltage division of the first resistor R1 and the fourth resistor R4, and the comparator IC2 is provided with a second comparison voltage value through voltage division of the second resistor R2, the third resistor R3 and the fourth resistor R4.
In the device for supplying power to the railway cable acquisition and transmission unit, the control module is used for monitoring the electric quantity of the super capacitor; after the super capacitor is fully charged, the switch tube is started to discharge, the electric quantity stored by the super capacitor can be used for collecting data transmitted by the transmission unit at least once for supplying power, and then the switch tube is turned off. And then the super capacitor is charged, so that the next power supply is completed. The main working process of the control module is as follows: the super capacitor interface CJDR is connected with a super capacitor, a power supply which is rectified and stabilized provides the super capacitor for charging, meanwhile, the comparator IC2 is powered, and the output voltage of the super capacitor supplies power for the acquisition transmission unit through the acquisition transmission unit interface CJDY. A first comparison voltage value for judging whether the super capacitor is fully charged or not is provided by voltage division of the first resistor R1 and the second resistor R4, and a second comparison voltage value limited under discharge of the super capacitor is provided by voltage division of the second resistor R2, the third resistor R3 and the fourth resistor R4; therefore, the electric energy stored by the super capacitor is controlled to meet the requirement of at least one time of data transmission and power supply of the acquisition and transmission unit, so that a proper super capacitor can be selected, and the super capacitor can be fully charged within a specified time. When the voltage value of the super capacitor is larger than the first comparison voltage value, the controlled switching tube is conducted, and the super capacitor supplies power to the acquisition and transmission unit; and when the voltage value of the super capacitor is smaller than the second comparison voltage value, the controlled switching tube is switched off, and the super capacitor is continuously charged.
In the device for supplying power to the railway cable acquisition and transmission unit of this embodiment, the electric energy stored in the super capacitor needs to satisfy the requirement of supplying power to the acquisition and transmission unit for transmitting data at least once.
According to the device for supplying power to the railway cable acquisition and transmission unit, the super capacitor is charged by sensing the current in the power supply cable, and then the super capacitor supplies power to the acquisition and transmission unit, and as the current is always in the power supply cable, 24-hour charging can be realized, the super capacitor is kept charged, and the time-sharing transmission of data of the acquisition and transmission unit is realized; the device is characterized in that the railway power supply cable generally has only a small current of about 5A, the device charges a super capacitor by sensing the small current of the power supply cable through a current transformer, the super capacitor can supply power to an acquisition and transmission unit in a time-sharing manner, and the acquisition and transmission unit at least completes data transmission once every time power is supplied, so that the data transmission requirements of the acquisition and transmission unit of the railway cable are met; the adopted control module can avoid the overcharge and the over-discharge of the super capacitor by using a low-power consumption device in a circuit switching mode; the device is easy to install, does not need to be replaced regularly like a battery, does not need a mounting environment with higher requirements, and has good applicability and strong practicability.
The above embodiments should not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent transformations fall within the protection scope of the present invention.

Claims (6)

1. A device for supplying power to a railway cable acquisition and transmission unit, characterized in that: the current transformer, the rectification and voltage stabilization module, the control module and the super capacitor are included; the current transformer is sleeved on the power supply cable, the output end of the current transformer is electrically connected with the input end of the rectification voltage stabilizing module, and the input end of the super capacitor is electrically connected with the output end of the rectification voltage stabilizing module; the output end of the super capacitor is electrically connected with the power supply end of the acquisition and transmission unit; the control module is connected in the super capacitor and the acquisition and transmission unit and used for controlling the charging and discharging of the super capacitor.
2. The apparatus of claim 1, wherein the power supply comprises: a comparator and a switching tube are adopted in a circuit of the control module; the comparator is configured to: setting a first comparison voltage value for judging whether the super capacitor is fully charged or not, and setting a first comparison voltage value limited under discharge of the super capacitor; is further configured to: when the voltage value of the super capacitor is larger than the first comparison voltage value, controlling the switching tube to be conducted, and supplying power to the super capacitor; and when the voltage value of the super capacitor is smaller than the second comparison voltage value, the switching tube is controlled to be switched off, and the super capacitor is charged.
3. An apparatus for powering a railway cable acquisition transmission unit according to claim 2, wherein: and the output end of the rectification voltage-stabilizing module is also used for supplying power to the comparator.
4. A device for powering a railway cable acquisition transmission unit according to claim 3, characterized in that: in the circuit of the rectification voltage-stabilizing module, a rectifier bridge, a voltage-stabilizing diode and a filter capacitor are adopted; the input end of the rectifier bridge is electrically connected with the output end of the current transformer; the current output by the current transformer is converted into direct current voltage after being processed by the rectifier bridge, the direct current voltage is stabilized by the voltage stabilizing diode, and then a stable direct current voltage signal is output by filtering of the filter capacitor and used for charging the super capacitor.
5. A device for powering a railway cable acquisition transmission unit according to claim 3, characterized in that: the comparator at least comprises a non-inverting input end, an output end and a reference voltage end; the circuit of the control module is at least provided with a super capacitor interface, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a capacitor and an acquisition and transmission unit interface; the first end of the super capacitor interface is electrically connected with the first end of the acquisition and transmission unit interface; the second end of the super capacitor interface is grounded, and the second end of the acquisition and transmission unit interface is connected with the D pole of the switching tube; the S pole of the switching tube is grounded; the first end of the first resistor is electrically connected with the first end of the super capacitor interface, the second end of the first resistor is electrically connected with the first end of the fourth resistor, and the second end of the fourth resistor is grounded; the first end of the second resistor is electrically connected with the first end of the super capacitor interface, and the second end of the second resistor is electrically connected with the first end of the third resistor; the second end of the third resistor is electrically connected with the first end of the fourth resistor; the in-phase input end of the comparator is electrically connected with the first end of the fourth resistor, the inverting input end of the comparator is electrically connected with the first end of the fifth resistor, the second end of the fifth resistor is electrically connected with the reference voltage end of the comparator, the output end of the comparator is respectively electrically connected with the G pole of the switch tube and the first end of the third resistor, a first comparison voltage value is provided for the comparator through the voltage division of the first resistor and the fourth resistor, and a second comparison voltage value is provided for the comparator through the voltage division of the second resistor, the third resistor and the fourth resistor.
6. An apparatus for powering a railway cable acquisition and transmission unit according to any one of claims 1 to 5, characterized in that: the electric energy stored by the super capacitor needs to meet the power supply requirement of data transmission of the acquisition and transmission unit at least once.
CN202110175694.2A 2021-02-09 2021-02-09 Device for supplying power to railway cable acquisition and transmission unit Pending CN112821573A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110175694.2A CN112821573A (en) 2021-02-09 2021-02-09 Device for supplying power to railway cable acquisition and transmission unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110175694.2A CN112821573A (en) 2021-02-09 2021-02-09 Device for supplying power to railway cable acquisition and transmission unit

Publications (1)

Publication Number Publication Date
CN112821573A true CN112821573A (en) 2021-05-18

Family

ID=75864513

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110175694.2A Pending CN112821573A (en) 2021-02-09 2021-02-09 Device for supplying power to railway cable acquisition and transmission unit

Country Status (1)

Country Link
CN (1) CN112821573A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114069882A (en) * 2021-11-16 2022-02-18 华东交通大学 Self-powered low-voltage power supply system of high-voltage power cable and control method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114069882A (en) * 2021-11-16 2022-02-18 华东交通大学 Self-powered low-voltage power supply system of high-voltage power cable and control method thereof
CN114069882B (en) * 2021-11-16 2024-01-30 华东交通大学 Self-powered low-voltage power supply system of high-voltage power cable and control method thereof

Similar Documents

Publication Publication Date Title
CN102640076B (en) Power converter with reduced power consumption when toggling between sleep and normal modes during device charging
EP0631696B1 (en) A power supply and battery charging system
US7017055B1 (en) Hub that can supply power actively
US20150019894A1 (en) Power Supply Control Device, Power Supply System and Electronic Device
CN110861512A (en) Charging control device, charger and vehicle
CN211508661U (en) Portable power supply equipment
CN112821573A (en) Device for supplying power to railway cable acquisition and transmission unit
CN108092349A (en) Charging unit for electric installation and to charge for electric installation
CN111864888B (en) Method for automatically adjusting operation mode
CN103683435A (en) Voltage stabilizing frequency stabilizing uninterruptible power supply (UPS) and intelligent charging integrated method for mobile power supply
CN214755748U (en) Device for supplying power to railway cable acquisition and transmission unit
CN106160196B (en) Uninterrupted power supply system of intermittent power supply concentrator of distribution transformer
CN210225002U (en) Charging control device and system
CN104767243A (en) Charging method, charging device, charging circuit and charging system with charging circuit
CN205283221U (en) Fill by force and fill portable power source soon
CN114301119A (en) Wake-up circuit, battery management system, battery pack and electric device
CN210430980U (en) Rechargeable battery power supply device
KR20150062785A (en) Low heat wireless power receiving device
CN209896766U (en) Multi-mode power supply automatic switching circuit
CN209823910U (en) Video monitoring device for combined power-taking overhead power line
CN115378057A (en) Wireless charging method, device and storage medium
CN114696435A (en) Vehicle emergency charging system, control method and vehicle
CN205004816U (en) Intelligent charging ware and control circuit charges thereof
CN209823443U (en) Intelligent acquisition system and intelligent acquisition instrument using same
CN215494050U (en) Use power down detection device on filling electric pile

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination