CN211015184U - Direct current switch circuit and direct current switch device comprising same - Google Patents

Direct current switch circuit and direct current switch device comprising same Download PDF

Info

Publication number
CN211015184U
CN211015184U CN201921799619.8U CN201921799619U CN211015184U CN 211015184 U CN211015184 U CN 211015184U CN 201921799619 U CN201921799619 U CN 201921799619U CN 211015184 U CN211015184 U CN 211015184U
Authority
CN
China
Prior art keywords
switch
circuit
direct current
output
unit
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.)
Active
Application number
CN201921799619.8U
Other languages
Chinese (zh)
Inventor
阳林
王勇
赵跃
夏维
赵旭东
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.)
Chongqing Ruidun Technology Development Co ltd
Original Assignee
Chongqing Ruidun Technology Development 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
Priority to CN201921478687 priority Critical
Priority to CN2019214786874 priority
Application filed by Chongqing Ruidun Technology Development Co ltd filed Critical Chongqing Ruidun Technology Development Co ltd
Application granted granted Critical
Publication of CN211015184U publication Critical patent/CN211015184U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The utility model provides a direct current switch circuit and contain this switch circuit's direct current switching device. The direct current switch circuit comprises at least one switch channel, wherein the switch channel comprises an input terminal and an output terminal, the input terminal is externally connected with a direct current power supply, and the output terminal is externally connected with a direct current load; the switch channel is connected with at least one control switch; arc extinguishing devices are connected in parallel at two ends of the control switch. This direct current switch circuit realizes going up the electricity and the power down of external direct current load through control switch to reduce the harm of electric arc that produces when going up the electricity through arc control device to the control switch contact, traditional direct current contactor has been abandoned to this direct current switch circuit, makes the volume less, and is with low costs, can satisfy the last electric control of going up of a plurality of passageways.

Description

Direct current switch circuit and direct current switch device comprising same
Technical Field
The utility model relates to an electrical technology field, concretely relates to direct current switch circuit and contain this switch circuit's direct current switching device.
Background
In the communication base station, because of different business requirements, the equipment of the operator needs to be powered on or powered off by direct current from time to time, for example, the direct current voltage is 48V, and the current is 50A, 120A or more, and usually a direct current contactor is needed to complete the powering on and powering off of the equipment of the operator, but the direct current contactor is usually large in size, high in cost, large in occupied space, not beneficial to device miniaturization, and not beneficial to low-cost operation requirements of enterprises.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects existing in the prior art, the present invention provides a dc switch circuit and a dc switch device including the same.
In order to achieve the above object of the present invention, according to a first aspect of the present invention, the present invention provides a dc switch circuit, comprising at least one switch channel, wherein the switch channel comprises an input terminal and an output terminal, the input terminal is externally connected to a dc power supply, and the output terminal is externally connected to a dc load;
each switch channel is connected with at least one control switch;
arc extinguishing devices are connected in parallel at two ends of the control switch.
The beneficial effects of the above technical scheme are: this direct current switch circuit realizes going up the electricity and the power down of external direct current load through control switch to reduce the harm of electric arc that produces when going up the electricity through arc control device to the control switch contact, traditional direct current contactor has been abandoned to this direct current switch circuit, makes the volume less, and is with low costs, can satisfy the last electric control of going up of a plurality of passageways.
The utility model discloses an in a preferred embodiment, still include the control unit, control switch includes the switch of concatenating in the interface of input terminal and output terminal, the switch has manual control end and electric control end, the electric control end is connected with the output of control unit.
The beneficial effects of the above technical scheme are: only one switch element is used, the power-on and power-off of the external direct current load can be controlled manually and electrically, the structure is simple, and the cost is further reduced.
In a preferred embodiment of the present invention, the switch further comprises an electrical parameter measuring unit disposed in at least one of the switch channels.
The beneficial effects of the above technical scheme are: the power utilization condition of the external load in each switch channel is monitored, and the power utilization control is facilitated. The utility model discloses an in a preferred embodiment, still include display element and/or memory cell, electrical parameter measuring unit's output is connected with display element and/or memory cell's input.
The beneficial effects of the above technical scheme are: can directly perceivedly observe the power consumption condition of the external direct current load of every switch passageway through the display element, preserve the power consumption information of external direct current load through the memory cell, the staff's of being convenient for inquiry.
In a preferred embodiment of the present invention, the switch further includes an overcurrent protection unit connected in series in at least one switch channel.
The beneficial effects of the above technical scheme are: and each switching channel is subjected to overcurrent protection, so that devices on the switching channels are prevented from being damaged when a load is overloaded or short-circuited.
In a preferred embodiment of the present invention, the control unit includes one or more signal receiving units, and an output end of the signal receiving unit is connected to an electric control end of the switch.
The beneficial effects of the above technical scheme are: the on-off of the switch is controlled by the external signal received by the signal receiving unit, the circuit structure is simple, and the cost is low.
The utility model discloses an in a preferred embodiment, the signal receiving unit is light signal receiving unit, or for receiving the trigger unit of external sensor output signal, or for wireless communication signal receiving module, or for wired communication signal receiving module.
The beneficial effects of the above technical scheme are: several configurations are disclosed that are readily accessible to the signal receiving unit.
In a preferred embodiment of the present invention, the signal receiving unit includes a processor, and a triggering unit and/or a wired communication signal receiving module for receiving an output signal of the external sensor;
the first input end of the processor is connected with the output end of the trigger unit, the second input end of the processor is connected with the output end of the wired communication signal receiving module, and the input end of the wired communication signal receiving module is connected with the remote console in a wired communication manner;
and the first output end of the processor is respectively connected with the electric control end of the switch.
The beneficial effects of the above technical scheme are: a structural form of a signal receiving unit is disclosed.
In a preferred embodiment of the present invention, the switch channel includes a relay and a driving circuit;
the driving circuit is arranged in a power supply loop of the relay coil, a power supply end of the driving circuit is connected with a power supply end, an output end of the driving circuit is connected with a power supply end of the coil, and a control end of the driving circuit is connected with an output end of the control unit;
the contacts of the relay are connected in series in the connecting path of the input terminal and the output terminal.
The beneficial effects of the above technical scheme are: a hardware structure of switch channel is disclosed, which can effectively and safely control the power-on or power-off of the drive circuit to the external DC load by weak current signal.
In order to realize the above object of the utility model, according to the utility model discloses a second aspect, the utility model provides a direct current switch device, including base plate and vertical set up in the power strip of base plate one side, be provided with on the base plate and be had the direct current switch circuit, the power strip includes DC/DC power supply circuit, the external outside power supply of DC/DC power supply circuit's input, DC/DC power supply circuit's output with each feeder ear of direct current switch circuit is connected on the base plate.
The beneficial effects of the above technical scheme are: the direct current switch device can effectively and safely power on or power off a plurality of external direct current loads, abandons a traditional direct current contactor, greatly reduces the size, reduces the cost, and further reduces the occupied space by arranging the power panel on one side of the substrate.
In a preferred embodiment of the present invention, the power supply further comprises an overvoltage protection unit disposed at an input end of the DC/DC power circuit;
and/or a lightning protector is provided, and all or part of the input terminal, the output terminal, the input end of the DC/DC power supply circuit and the output end of the DC/DC power supply circuit are connected with the ground through the lightning protector.
The beneficial effects of the above technical scheme are: the overvoltage protection unit is arranged to protect the power supply of the direct current switch device, and the phenomenon that the direct current switch device cannot work due to the fact that the DC/DC power circuit is damaged by the fact that too high voltage is input into the input end of the DC/DC power circuit is avoided. Through setting up the lightning protection device for direct current switching device has the lightning protection effect, avoids damaging the thunderbolt and damages or the trouble, has improved security and the reliability of using at communication base station. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a transmission channel of a dc switch circuit according to a preferred embodiment of the present invention;
fig. 2 is a circuit diagram of a dc switch circuit according to a preferred embodiment of the present invention;
fig. 3 is a schematic structural diagram of a transmission channel of a dc switch circuit according to another preferred embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or may be connected between two elements through an intermediate medium, or may be directly connected or indirectly connected, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The utility model discloses a direct current switch circuit, in a preferred embodiment, as shown in figure 1, the direct current switch circuit comprises at least one switch channel, the switch channel comprises an input terminal and an output terminal, the input terminal is externally connected with a direct current power supply, and the output terminal is externally connected with a direct current load;
the switch channel is connected with at least one control switch;
arc extinguishing devices are connected in parallel at two ends of the control switch.
In this embodiment, the input terminal and the output terminal may be selected from the existing electrical connection socket capable of carrying a large current, for example, the carrying current is greater than 40A, and reaches 50A, 120A or even greater current; the control switch can be a manual switch, an electric control switch or a combination of the manual switch and the electric control switch.
In the present embodiment, the arc extinguishing device is preferably, but not limited to, an existing arc extinguishing product, such as a DM-2 type dc arc extinguisher manufactured by great company, electronics technologies, ltd, a composite PTC thermistor manufactured by watma technologies, etc., or an RC arc extinguishing circuit is selected and connected in series through a resistor and a capacitor, and the series circuit is connected in parallel across the control switch.
In a preferred embodiment, the control unit further comprises a control switch including a switch serially connected in a connection path of the input terminal and the output terminal, the switch having a manual control terminal and an electric control terminal, the electric control terminal being connected to an output terminal of the control unit.
In the present embodiment, as shown in fig. 1, the switch is preferably but not limited to a relay, and contacts of the relay are connected in series in a connection path of the input terminal and the output terminal, on one hand, the control unit controls the relay coil to be powered on or powered off through an electric control terminal, so as to implement the on and off of the switch, and the electric control terminal may be a control terminal of a driving device connected in series in a relay coil power-on loop, such as a gate of a MOS transistor, or a base of a triode; on the other hand, the manual control end is an insulated handheld part arranged on a spring piece (preferably an opening end of the spring piece) of the normally open contact, and the manual on-off of the control switch is realized by pushing the handheld part to move back and forth.
In a preferred embodiment, the system further comprises an electrical parameter measuring unit arranged in at least one switching channel.
In the present embodiment, the electrical parameter measuring unit preferably includes, but is not limited to, a direct current electric energy meter, a power meter, a voltage meter, an ammeter, and the like. The direct current electric energy meter, the power meter, the voltmeter and the ammeter can all select the existing products, of course, the voltmeter can also be a resistance voltage division network, one end of the resistance voltage division network is connected with the output terminal, the other end of the resistance voltage division network is connected with the ground, and the output end of the resistance voltage division network is connected with a rear-stage circuit (such as a display unit, a processor and the like). The ammeter may be a current transformer.
In a preferred embodiment, the device further comprises a display unit and/or a storage unit, and the output end of the electrical parameter measuring unit is connected with the input end of the display unit and/or the storage unit.
In this embodiment, the display unit is preferably, but not limited to, an L CD display module or a L ED display module, etc. for displaying electrical parameters of each channel, such as current, voltage, power or electricity.
In a preferred embodiment, the overcurrent protection device further comprises an overcurrent protection unit connected in series in at least one switching channel. Specifically, each switch channel may be connected to an overcurrent protection unit, or several switch channels may share one overcurrent protection unit.
In the present embodiment, the overcurrent protection unit is preferably, but not limited to, a self-recovery Fuse, i.e., a positive temperature coefficient thermistor (PTC) that can be connected in series to any position of the connection path of the input terminal and the output terminal. When the current of the switch channel is normal, the self-recovery fuse is in a normal state, the resistance value is very small, and the normal work of the switch channel is not influenced. The self-healing fuse is preferably, but not limited to, a product selected as model number FSMD 1812.
In a preferred embodiment, the control unit comprises one or more signal receiving units, the output of which is connected to the electrical control of the switch.
In this embodiment, when the control unit includes one signal receiving unit, the output terminal of the signal receiving unit is connected to the electrical control terminals of all the switches; when the control unit includes a plurality of signal receiving units, the output ends of the signal receiving units may be connected to the electric control ends of all the switches in a one-to-one correspondence manner, or the output ends of the signal receiving units may be connected to the electric control ends of the switches in a one-to-many manner, or the output ends of the signal receiving units may be connected to the electric control ends of the switches in a many-to-one manner.
In a preferred embodiment, the signal receiving unit is an optical signal receiving unit, or a triggering unit for receiving an output signal of an external sensor, or a wireless communication signal receiving module, or a wired communication signal receiving module.
In this embodiment, when the signal receiving unit is an optical signal receiving unit, it is preferably, but not limited to, an optoelectronic switch, which receives an external optical signal and outputs a high level signal to an electric control terminal of a switch connected thereto, so as to close the switch and power on an external dc load, and when the external optical signal cannot be received, outputs a low level signal to the electric control terminal of the switch connected thereto, so as to open the switch and power off the external dc load.
In this embodiment, when the signal receiving unit is a trigger unit for receiving the output signal of the external sensor, the trigger unit is preferably, but not limited to, a high level trigger or a rising edge trigger, and an existing product may be selected. The external sensor is preferably but not limited to an illumination sensor, when sunlight exists, a high level is output to the trigger unit, and the trigger unit outputs the high level to the electric control end of the switch connected with the trigger unit to control the corresponding direct current load to be electrified.
In this embodiment, when the signal receiving unit is a wireless communication signal receiving module, it is preferable, but not limited to, to select an existing product such as a WIFI communication module, a Zigbee communication module, a GSM communication module, an L TE communication module, or a 3G communication module, and any control pin of a modem chip inside these modules is connected to an electric control end of a corresponding switch, so that on/off of each switch can be remotely controlled, and remote power-on/off control of a dc load can be realized.
In the present embodiment, when the signal receiving unit is a wired communication signal receiving module, it is preferable to select, but not limited to, existing products such as an ethernet port communication module and a serial port communication module.
Fig. 2 is a circuit diagram of a preferred embodiment of the present invention, in which the signal receiving unit includes a processor, and a triggering unit and/or a wired communication signal receiving module for receiving an output signal of an external sensor;
the first input end of the processor is connected with the output end of the trigger unit, the second input end of the processor is connected with the output end of the wired communication signal receiving module, and the input end of the wired communication signal receiving module is connected with the remote console in a wired communication manner;
the first output end of the processor is respectively connected with the electric control end of the switch.
In this embodiment, the processor is preferably, but not limited to, a single chip microcomputer, such as model number STM32051C8T 6; the trigger unit is preferably but not limited to an existing high-level or rising edge trigger, and the output end of the trigger is connected with the processor through an I/O pin; the wired communication signal receiving module is preferably but not limited to a 485 serial port communication module, the wired communication signal receiving module is connected and communicated with the processor through a UART serial port, and the 485 serial port communication module is connected with a 485 interface of the remote control console through a serial port line. The processor is connected with the electric control ends of the 3 switches in a one-to-one correspondence mode through the 3I/O pins.
In the present embodiment, it is preferable that the electronic device further includes an electrical parameter measuring unit provided in a connection path between at least one pair of the input terminal and the output terminal;
and/or further comprising a display unit;
and/or further comprising a data storage unit;
the output end of the electrical parameter measuring unit is respectively connected with the third input end of the processor;
the second output end of the processor is connected with the input end of the display unit, and the third output end of the processor is connected with the input end of the data storage unit.
As shown in fig. 2, the processor is connected to the display unit through PB0, PB1, and PB3 pins, connected to the data storage unit through the SPI serial port, and connected to the electrical parameter measurement units of 3 switch channels through 3 ADC pins in a one-to-one correspondence manner.
In this embodiment, it is preferable that the display unit displays the current operating mode of the dc switch circuit, specifically including a manual mode and an automatic mode, where the manual mode is to manually control the on/off of each channel, and the automatic mode is to automatically control the on/off of each channel through a remote signal. In a preferred embodiment, as shown in FIG. 1, the switch channel includes a relay and a drive circuit;
the driving circuit is arranged in a power supply loop of the relay coil, a power supply end of the driving circuit is connected with a power supply end, an output end of the driving circuit is connected with a power supply end of the coil, and a control end of the driving circuit is connected with an output end of the control unit; the contacts of the relay are connected in series in the connection path of the input terminal and the output terminal.
In this embodiment, the driving circuit is preferably, but not limited to, a triode driving circuit, a MOS transistor driving circuit, or the like. Preferably, the output end of the control unit may be an output end of the signal receiving unit, and specifically may be an output end of the optical signal receiving unit, an output end of the triggering unit, a first output end of the processor, and the like.
In a preferred embodiment, as shown in fig. 3, the driving circuit includes a transistor and a first resistor;
a first end of a coil of the relay is connected with a power supply end, a second end of the coil is connected with a collector of the triode, an emitter of the triode is connected with the ground, a base of the triode is connected with a first end of a first resistor, and a second end of the first resistor is connected with an output end of the control unit or an output end of the signal receiving unit or a first output end of the processor;
the contacts of the relay are connected in series in the connection path of the input terminal and the output terminal.
The utility model also discloses a direct current switching device, including base plate and the vertical power strip that sets up in base plate one side, be provided with on the base plate and be had like direct current switching circuit, the power strip includes DC/DC power supply circuit, the external outside power supply of DC/DC power supply circuit's input, DC/DC power supply circuit's output with each feeder ear of direct current switching circuit connects on the base plate.
In this embodiment, the DC/DC power circuit is a 48V-12V DCDC circuit, and the DCDC conversion chip MP2494 and its peripheral circuits can be selected, and the specific circuit structure can refer to the chip manual of MP2494, which is not described herein again. The external power supply is preferably, but not limited to, a 48V dc power supply.
In a preferred embodiment, the DC switching device further comprises an overvoltage protection unit disposed at an input terminal of the DC/DC power circuit;
and/or a lightning protector is provided, and all or part of the input terminal, the output terminal, the input end of the DC/DC power supply circuit and the output end of the DC/DC power supply circuit are connected with the ground through the lightning protector.
In this embodiment, the overvoltage protection unit preferably includes an overvoltage protection chip and a peripheral circuit thereof, the overvoltage protection chip may select L TC4367, the specific circuit structure may refer to a technical manual of the chip, and no further description is given here, and when the voltage accessed by the input terminal of the DC/DC power circuit exceeds an allowable range, the L TC4367 may cut off the connection between the external power supply and the DC/DC power circuit.
In this embodiment, the lightning protection device at the input end of the DC/DC power circuit is preferably, but not limited to, the NKP-DY-III L-D48 lightning protection device product of kojia electric company, the lightning protection device at the output end of the DC/DC power circuit is preferably, but not limited to, the NKP-DY-III L-D12 lightning protection device product of kojia electric company, and the lightning protection device at the input terminal and the output terminal is preferably, but not limited to, the KDY-40-D48 lightning protection device product of kojia electric company.
In this embodiment, the lightning protection device may also select an existing dc lightning protection circuit, and the specific circuit structure may refer to a website: and the direct-current power supply lightning protection circuit disclosed by https:// wenku.baidu.com/view/3228c919964bcf84b9d57b63.html is not described herein again.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A direct current switch circuit is characterized by comprising at least one switch channel, wherein the switch channel comprises an input terminal and an output terminal, the input terminal is externally connected with a direct current power supply, and the output terminal is externally connected with a direct current load;
each switch channel is connected with at least one control switch;
arc extinguishing devices are connected in parallel at two ends of the control switch.
2. The dc switching circuit according to claim 1, wherein the control switch comprises a switch connected in series in a connection path of the input terminal and the output terminal, the switch having a manual control terminal and an electric control terminal, the electric control terminal being connected to an output terminal of the control unit.
3. The dc switching circuit of claim 1, further comprising an over-current protection unit connected in series in at least one switching channel.
4. The direct current switch circuit according to claim 1, further comprising an electrical parameter measuring unit disposed in at least one switch channel, and a display unit and/or a storage unit;
the output end of the electrical parameter measuring unit is connected with the input end of the display unit and/or the storage unit.
5. The dc switching circuit of claim 2, wherein the control unit comprises one or more signal receiving units, and wherein an output terminal of the signal receiving unit is connected to the electrical control terminal of the switch.
6. The direct current switch circuit according to claim 5, wherein the signal receiving unit is an optical signal receiving unit, or a triggering unit for receiving an output signal of an external sensor, or a wireless communication signal receiving module, or a wired communication signal receiving module.
7. The direct current switch circuit according to claim 5, wherein the signal receiving unit comprises a processor, and a triggering unit and/or a wired communication signal receiving module for receiving an output signal of an external sensor;
the first input end of the processor is connected with the output end of the trigger unit, the second input end of the processor is connected with the output end of the wired communication signal receiving module, and the input end of the wired communication signal receiving module is connected with the remote console in a wired communication manner;
and the first output end of the processor is respectively connected with the electric control end of the switch.
8. The direct current switch circuit according to one of claims 1 to 7, wherein the switch channel comprises a relay and a drive circuit;
the driving circuit is arranged in a power supply loop of the relay coil, a power supply end of the driving circuit is connected with a power supply end, an output end of the driving circuit is connected with a power supply end of the coil, and a control end of the driving circuit is connected with an output end of the control unit;
the contacts of the relay are connected in series in the connecting path of the input terminal and the output terminal.
9. A DC switch device, comprising a substrate and a power board vertically disposed on one side of the substrate, wherein the substrate is disposed with the DC switch circuit as claimed in any one of claims 1 to 8, the power board comprises a DC/DC power circuit, an input terminal of the DC/DC power circuit is externally connected to an external power supply, and an output terminal of the DC/DC power circuit is connected to each power supply terminal of the DC switch circuit on the substrate.
10. The direct current switching device according to claim 9, further comprising an overvoltage protection unit provided at an input terminal of the DC/DC power supply circuit;
and/or a lightning protector is provided, and all or part of the input terminal, the output terminal, the input end of the DC/DC power supply circuit and the output end of the DC/DC power supply circuit are connected with the ground through the lightning protector.
CN201921799619.8U 2019-09-06 2019-10-24 Direct current switch circuit and direct current switch device comprising same Active CN211015184U (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201921478687 2019-09-06
CN2019214786874 2019-09-06

Publications (1)

Publication Number Publication Date
CN211015184U true CN211015184U (en) 2020-07-14

Family

ID=71476920

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201921799619.8U Active CN211015184U (en) 2019-09-06 2019-10-24 Direct current switch circuit and direct current switch device comprising same

Country Status (1)

Country Link
CN (1) CN211015184U (en)

Similar Documents

Publication Publication Date Title
CN201594664U (en) Electric energy metering socket with electric leakage and overload protection function
CN201383668Y (en) Over-current protection circuit and motor controller applied to same
CN201682430U (en) Temperature control power supply device
CN103092147A (en) Process control field device with circuitry protection
EP3407156A1 (en) Control apparatus and combiner box
US9097772B2 (en) Battery test and condensation prevention method, system and apparatus
CN211015184U (en) Direct current switch circuit and direct current switch device comprising same
CN211088168U (en) Manually controllable direct current switch circuit and direct current switch device
CN200969510Y (en) Minisize intelligent electricity protector
CN210534559U (en) Circuit board layout structure of direct current switch device
CN210328309U (en) Data center computer room network cabinet
CN105515072A (en) Communication power supply battery anti-reverse-connection circuit and communication power supply control system
CN204423222U (en) A kind of D.C. regulated power supply current foldback circuit
CN201740830U (en) Surge protector thermal stability testing device
CN207977776U (en) A kind of DC power cabinet
CN210468769U (en) Intelligent circuit breaker
Guerriero et al. A wireless controlled circuit for PV panel disconnection in case of fire
CN211826218U (en) Heater monitoring relay
CN213936067U (en) Circuit breaker that possesses electric quantity collection function
CN202373805U (en) Electricity-saving protecting device of internet of things
CN214708251U (en) PDU cabinet
CN206685780U (en) A kind of terminal box intelligently powered off
KR102293197B1 (en) Photovoltaic equipment
CN210490548U (en) Intelligent high-voltage switch cabinet
CN213843459U (en) Electric device testing arrangement

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant