CN216794857U

CN216794857U - Equivalent current-variable power supply

Info

Publication number: CN216794857U
Application number: CN202123368088.7U
Authority: CN
Inventors: 巩晨赟; 陈涛; 张为庚
Original assignee: Wenzhou Zhenze Electronics Co ltd
Current assignee: Zhejiang Zhongxin Avionics Equipment Manufacturing Co ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-06-21
Anticipated expiration: 2031-12-29

Abstract

The utility model relates to a power supply, in particular to an equivalent variable current power supply, which comprises a power conversion module, a first power module, a detection module, a main control module, an input module, an output module and a touch display used for setting and displaying parameters, wherein the power conversion module is provided with a power input interface, an output power interface and a first communication interface, the first power module is provided with a first input interface and a first output interface, the detection module comprises a voltage sensor, the voltage sensor is provided with a first power supply interface, a voltage measurement interface and a signal output interface, the touch display is provided with a second power supply interface and a second communication interface, the input module comprises a plurality of control switches, the output module comprises an alarm device, the first communication interface and the second communication interface are both in communication connection with the main control module, and the voltage measurement interface is connected to the power input interface in parallel. The utility model can conveniently control and output the adjustable direct current voltage and can also give an alarm in time when the equivalent variable current power supply is abnormal.

Description

Equivalent current-variable power supply

Technical Field

The utility model relates to the technical field of power supplies, in particular to an equivalent variable current power supply.

Background

The equivalent variable current power supply is used for converting specified direct current voltage input into adjustable direct current voltage output. The equivalent variable current power supply is used as a load for simulating a medium-voltage direct-current network, electric energy is obtained through a simulation power distribution system and a load system, and the electric energy is converted to supply power for the direct-current regional power distribution simulation test facilities.

Most of the existing equivalent variable current power supplies are complex in design and often cannot conveniently output adjustable direct current voltage, and the existing equivalent variable current power supplies often do not have an alarm function and cannot give an alarm in time when the equivalent variable current power supplies are abnormal, so that great inconvenience is brought to the actual use of the equivalent variable current power supplies. The present invention improves upon the above-described deficiencies.

Disclosure of Invention

In order to overcome the defects of the background art, the utility model provides the equivalent variable current power supply which is reasonable in design, can conveniently control and output adjustable direct current voltage, and can timely give an alarm when the equivalent variable current power supply is abnormal, so that the actual use requirements can be better met.

The technical scheme adopted by the utility model is as follows: an equivalent variable current power supply comprises a power conversion module, a first power supply module, a detection module, a main control module, an input module, an output module and a touch display used for setting and displaying parameters, wherein the power conversion module is provided with a power input interface, an output power supply interface and a first communication interface, the first power supply module is provided with a first input interface and a first output interface, the detection module comprises a voltage sensor, the voltage sensor is provided with a first power supply interface, a voltage measurement interface and a signal output interface, the touch display is provided with a second power supply interface and a second communication interface, the input module comprises a plurality of control switches, the output module comprises an alarm device, the power input interface and the first input interface both input total power supply direct current voltage, the output power supply interface outputs adjustable direct current voltage, and the first communication interface and the second communication interface both are in communication connection with the main control module, the first output interface outputs direct-current working voltage, the first power supply interface, the second power supply interface and the main control module are all connected into the direct-current working voltage to supply power, the voltage measurement interface is connected to the power input interface in parallel, the main control module is electrically connected with the signal output interface, the input module and the output module, and the input module and the output module are electrically connected with the anode of the direct-current working voltage.

Preferably, the main control module adopts a programmable controller, the programmable controller is in communication connection with the first communication interface through an RS485 communication interface, a power input end of the programmable controller is connected to the direct-current working voltage, the input module is electrically connected to a switching value input interface of the programmable controller, the output module is electrically connected to a switching value output interface of the programmable controller, and the signal output interface is electrically connected to an analog value input/output interface of the programmable controller.

Preferably, the input module comprises a start switch, a stop switch and an alarm elimination switch, the start switch is a first button, the stop switch is a second button, the alarm eliminating switch is a third button, one end of each of the first button, the second button and the third button is electrically connected with the anode of the direct current working voltage, the other end of each of the first button, the second button and the third button is respectively used as one input and is respectively electrically connected with a switching value input interface of the programmable controller, the first button is a button with a lamp, the first button is provided with an operation indicating lamp, the output module comprises an alarm indicating lamp and an alarm buzzer, and three paths of outputs of the switching value output interface are respectively and electrically connected with one ends of the operation indicator lamp, the alarm indicator lamp and the alarm buzzer, and the other ends of the operation indicator lamp, the alarm indicator lamp and the alarm buzzer are electrically connected with the anode of the direct-current working voltage.

Preferably, still include second power module and first diode, the second power module has second input interface and second output interface, second input interface inserts auxiliary power, auxiliary power is AC220V, first diode has two inputs and an output, and two inputs divide into first input and second input, the anodal electricity of first output interface is connected first input, the anodal electricity of second output interface is connected the second input, the output of first diode is regarded as direct current operating voltage's positive pole, the negative pole of first output interface with after the negative pole short circuit of second output interface as direct current operating voltage's negative pole.

Preferably, the power conversion module further has a parallel current sharing interface, a parallel current sharing control interface and a parallel network interface, the input module further includes a parallel selection switch, the output module further includes an intermediate relay and a second diode, the parallel selection switch is a short handle knob, one end of the parallel selection switch is electrically connected to the positive pole of the dc working voltage, the other end of the parallel selection switch is electrically connected to the switching value input interface of the programmable controller as one input, the intermediate relay includes a relay coil and a relay contact, one output of the switching value output interface is electrically connected to one end of the relay coil, the other end of the relay coil is electrically connected to the positive pole of the dc working voltage, the second diode is connected in parallel to both ends of the relay coil, and the negative pole of the second diode is electrically connected to the positive pole of the dc working voltage, and two ends of the relay contact are connected in parallel to the parallel current-sharing control interface.

Preferably, still include the current protection device, the current protection device includes first fuse, second fuse, third fuse, fourth fuse, fifth fuse, sixth fuse, seventh fuse and eighth fuse, first fuse and second fuse are established ties respectively on two inlet terminals of mains DC voltage, the third fuse is established ties the positive inlet terminal of first input interface, the fourth fuse is established ties the live wire inlet terminal of second input interface, the output of first diode is established ties the fifth fuse, the negative pole of first output interface with establish ties behind the negative pole short circuit of second output interface the sixth fuse, seventh fuse and eighth fuse are established ties respectively on two outlet terminals of output power source interface.

Preferably, the cooling device further comprises a cooling module, wherein the cooling module comprises a fan and a power indicator, the fan is connected with the power indicator in parallel, and the fan and the power indicator are powered by the direct-current working voltage.

Preferably, the programmable controller is provided with two paths of RS485 communication interfaces, wherein one path of RS485 communication interface is in communication connection with the first communication interface, and the other path of RS485 communication interface is used for being connected with a superior monitoring device for communication.

In conclusion, the beneficial effects of the utility model are as follows:

1. the equivalent variable current power supply comprises a power conversion module, a first power supply module, a detection module, a main control module, an input module, an output module and a touch display for setting and displaying parameters, and is reasonable in design, not only can conveniently control and output adjustable direct current voltage, but also can timely give an alarm when the equivalent variable current power supply is abnormal, so that the actual use requirement can be better met;

2. the two equivalent variable current power supplies are connected through the parallel network interface to realize network line communication, the network line communication can realize data exchange, the two equivalent variable current power supplies are connected through the parallel current-sharing interface to enable the output voltages of power conversion modules in the two equivalent variable current power supplies to be consistent, the two equivalent variable current power supplies are connected in parallel to well realize parallel output, the parallel output can play a role in stabilizing voltage and stabilizing current, power supply can be better realized, and the actual use requirement can be better met;

3. the programmable controller is provided with two RS485 communication interfaces, one RS485 communication interface is in communication connection with the first communication interface, working state information of the power conversion module can be conveniently read, the other RS485 communication interface is in communication with superior monitoring equipment to realize remote monitoring, digitalization and informatization levels of the equipment are effectively improved, and working intensity of operators can be reduced.

The utility model is further described with reference to the following figures and detailed description.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of a first portion of a schematic of the present invention;

FIG. 2 is a schematic view of a second portion of the schematic of the present invention;

FIG. 3 is a schematic diagram of a main interface of a touch screen display according to the present invention;

FIG. 4 is a schematic illustration of CAT5E size cable 568B connections of the present invention;

FIG. 5 is a schematic view of a first portion of the external wiring diagram of the present invention;

FIG. 6 is a schematic view of a second portion of the external wiring diagram of the present invention;

FIG. 7 is a schematic view of a third portion of the external wiring diagram of the present invention;

the number of the power input interface, the number of the output power interface, the number of the communication interface, the number of the input interface, the number of the output interface, the voltage measuring interface, the signal output interface, the signal, the second power supply interface, the 10, the second communication interface, the second input interface, the 2, the output power interface, the number of the communication interface, the 1, the parallel network interface, the parallel connection, the 1;

-FU 1: first fuse, -FU 2: second fuse, -FU 3: third fuse, -FU 4: fourth fuse, -FU 5: fifth fuse, -FU 6: sixth fuse, -FU 7: seventh fuse, -FU 8: eighth fuse, -D1, first diode, -HL 1: power indicator, -SB 1: first button, -HL (SB 1): running indicator, SB 2: second button, SB 3: third button, -HAU 1: alarm buzzer, -HL 2: alarm indicator lamp, -MK 1: first power module, -PLC 1: programmable controller, -PLC 2: communication extension module, -MK 3: power conversion module, -HMI: touch display, -U1: voltage sensor, -MK 2: second power supply module, -SA 1: parallel selector switch, -KA 1: relay coil, -KA 1-1: relay contact, -D2: second diode, -M1: first fan, -M2: and a second fan.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 7 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention.

As shown in fig. 1 to 7, the equivalent variable current power supply disclosed in this embodiment includes a power conversion module-MK 3, a first power module-MK 1, a detection module, a main control module, an input module, an output module, and a touch display-HMI for setting and displaying parameters, where the power conversion module-MK 3 has a power input interface 1, an output power interface 2, and a first communication interface 3, the first power module-MK 1 has a first input interface 4 and a first output interface 5, the detection module includes a voltage sensor-U1, the voltage sensor-U1 has a first power supply interface 6, a voltage measurement interface 7, and a signal output interface 8, the touch display-HMI has a second power supply interface 9 and a second communication interface 10, the input module includes a plurality of control switches, the output module comprises an alarm device, the power input interface 1 and the first input interface 4 input the total power supply direct-current voltage, the output power interface 2 outputs the adjustable direct-current voltage, the first communication interface 3 and the second communication interface 10 are connected with the main control module in a communication mode, the first output interface 5 outputs the direct-current working voltage, the first power supply interface 6, the second power supply interface 9 and the main control module are connected with the direct-current working voltage for power supply, the voltage measurement interface 7 is connected with the power input interface 1 in parallel, the main control module is electrically connected with the signal output interface 8, the input module and the output module, and the input module and the output module are electrically connected with the positive pole of the direct-current working voltage.

In the technical scheme, the input total power supply direct current voltage is DC400V, DC700V-1000V is output through an output power interface 2, DC24V is output by a first output interface 5 of a first power module-MK 1 and serves as direct current working voltage, a main control module is in communication connection with a first communication interface 3 and can be conveniently communicated with a power conversion module-MK 3, the main control module is in communication connection with a second communication interface 10 and can be conveniently communicated with a touch display-HMI, the main control module can read the working state information of the power conversion module-MK 3 and then can display the working state information on the touch display-HMI, the power supply voltage and the power supply current on the output side of the power conversion module-MK 3 can be displayed on the touch display-HMI, and the power conversion module-MK 3 can be controlled by setting parameters on the touch display-HMI, such as setting an operation state (start or stop), a set voltage, a set current, a soft start time, etc., the voltage sensor-U1 measures the voltage at the input side of the power conversion module-MK 3 through the voltage measuring interface 7, and outputs a signal to the main control module through the signal output interface 8, the sensor signals are operated and processed by the main control module, so that the input voltage can be displayed on a touch display-HMI (human machine interface), the alarm prompt of the input under-voltage state can be controlled, the alarm prompt is realized by controlling an alarm device to give an alarm, the input module comprises a plurality of control switches, the manual control can be conveniently realized, therefore, the equivalent variable current power supply is reasonable in design, can conveniently control and output the adjustable direct current voltage, and can give an alarm in time when the equivalent variable current power supply is abnormal, so that the actual use requirement can be better met. In the specific implementation of this embodiment, the device capacity of the power conversion module-MK 3 is 20kW, which is referred to the prior art and will not be further described herein; the specification model of the first power supply module MK1 is PDB150-400S24-C3, the input DC is 300-500V, and the output DC is 24V; the specification model of the voltage sensor-U1 is WBV342U05-S, and the working power supply: DC24V, measurement range: DC0-500V, output signal: 0-5V. During specific implementation, the power conversion module-MK 3 can also collect direct-current output busbar voltage and current information in real time, sends signals to the main control module through communication, and the main control module performs operation processing on the sensor signals and controls alarm prompting of an output overvoltage state, an output low-voltage state and an output overload state. The touch display HMI can refer to the prior art and is not further described here.

As a preferable technical solution, the main control module adopts a programmable controller-PLC 1, the programmable controller-PLC 1 is in communication connection with the first communication interface 3 through an RS485 communication interface, a power input end of the programmable controller-PLC 1 is connected to the dc working voltage, the input module is electrically connected to a switching value input interface of the programmable controller-PLC 1, the output module is electrically connected to a switching value output interface of the programmable controller-PLC 1, and the signal output interface 8 is electrically connected to an analog value input/output interface of the programmable controller-PLC 1. IN this embodiment, the PLC1 is configured with NHP3-32DT06MAD-D, INPUT-FCB/OUTPUT-FCB/IN/OUT-FCB junction boxes one by one, RS485 communication is adopted between the programmable controller-PLC 1 and the power conversion module-MK 3, the programmable controller-PLC 1 is connected with DC24V for power supply, the switching value input interface of the programmable controller-PLC 1 is provided with multiple inputs, can be conveniently and electrically connected with the input module to input control signals, the switching value output interface of the programmable controller-PLC 1 is provided with a plurality of outputs, can be conveniently and electrically connected with an output module for output control, the analog quantity input and output interface of the programmable controller-PLC 1 is also provided with a plurality of channels, an electrical connection signal output interface 8 can be facilitated to communicate the output signal of the voltage sensor-U1 to the programmable controller-PLC 1.

Preferably, the input module comprises a start switch, a stop switch and an alarm-eliminating switch, the start switch is a first button-SB 1, the stop switch is a second button-SB 2, the alarm-eliminating switch is a third button-SB 3, one end of each of the first button-SB 1, the second button-SB 2 and the third button-SB 3 is electrically connected with the positive pole of the dc operating voltage, the other end of each of the first button-SB 1, the second button-SB 2 and the third button-SB 3 is electrically connected with a switching value input interface of the programmable controller-PLC 1 as a single input, the first button-SB 1 is a lighted button, the first button-SB 1 is provided with an operation indicator light-HL (SB 1), the output module comprises an alarm indicator light-HL 2 and an alarm buzzer-HAU 1, the three paths of outputs of the switching value output interface are respectively and electrically connected with one ends of the operation indicator lamp-HL (SB 1), the alarm indicator lamp-HL 2 and the alarm buzzer-HAU 1, and the other ends of the operation indicator lamp-HL (SB 1), the alarm indicator lamp-HL 2 and the alarm buzzer-HAU 1 are respectively and electrically connected with the anode of the direct-current working voltage. In this embodiment, the first button-SB 1, the second button-SB 2, and the third button-SB 3 are respectively used as one path of switching value input of the PLC1, the first button-SB 1 is used to input a start signal to the PLC1, the start signal is used to control the start of the power conversion module-MK 3, the PLC1, after receiving the start signal, controls the power conversion module-MK 3 to perform power conversion and output a dc voltage, the PLC1 also controls the lighting of the operation indicator light-HL (SB 1) through one path of output control of the switching value output interface, the first button-SB 1 is used to input a stop signal to the PLC1, the stop signal is used to control the power conversion module-MK 3 to stop output, and the PLC1, when detecting an abnormality, controls the alarm finger to be turned on through two paths of output of the switching value output interface respectively The alarm prompting is realized by a display lamp-HL 2 and an alarm buzzer-HAU 1, a third button-SB 3 is used for inputting an alarm eliminating signal to a programmable controller-PLC 1, and after the programmable controller-PLC 1 receives the alarm eliminating signal, the stop alarm indicator lamp-HL 2 and the alarm buzzer-HAU 1 are respectively controlled by two paths of output of a switching value output interface, so that the alarm eliminating can be realized.

As a preferred technical solution, the dc power supply further includes a second power module-MK 2 and a first diode-D1, the second power module-MK 2 has a second input interface 11 and a second output interface 12, the second input interface 11 is connected to an auxiliary power supply, the auxiliary power supply is AC220V, the first diode-D1 has two input ends and one output end, the two input ends are divided into a first input end and a second input end, a positive electrode of the first output interface 5 is electrically connected to the first input end, a positive electrode of the second output interface 12 is electrically connected to the second input end, an output end of the first diode-D1 is used as a positive electrode of the dc operating voltage, and a negative electrode of the first output interface 5 and a negative electrode of the second output interface 12 are short-circuited and then used as a negative electrode of the dc operating voltage. In this embodiment, two power sources of the DC working voltage are provided, one is the total power DC voltage 400V, and the other is the auxiliary power AC220V, which can improve the stability of power supply, and when the total power DC voltage is not input, the DC working voltage can be provided by the auxiliary power and the second power module-MK 2, so as to better supply power to the programmable controller-PLC 1, the first power module-MK 1 and the second power module-MK 2 both output DC24V, and the first diode-D1 can isolate the positive output ends of the two power modules, so as to protect the two power modules, the negative electrode of the first output interface 5 is directly short-circuited with the negative electrode of the second output interface 12, and there is no voltage difference between the negative electrodes, so that the power modules are not damaged. When the embodiment is implemented specifically, the specification model of the second power module-MK 2 is RS150-24, AC176V-264V is input, and DC24V is output; the specification model of the first diode-D1 is MDK 25/2000V.

As a preferred technical solution, the power conversion module-MK 3 further has a parallel current sharing interface 13, a parallel current sharing control interface 14, and a parallel network interface 15, the input module further includes a parallel selection switch-SA 1, the output module further includes an intermediate relay and a second diode-D2, the parallel selection switch-SA 1 is a short handle knob, one end of the parallel selection switch-SA 1 is electrically connected to the positive electrode of the dc operating voltage, the other end of the parallel selection switch-SA 1 is electrically connected to the switching value input interface of the programmable controller-PLC 1 as one input, the intermediate relay includes a relay coil-KA 1 and a relay contact-KA 1-1, one output of the switching value output interface is electrically connected to one end of the relay coil-KA 1, the other end of the relay coil-KA 1 is electrically connected to the positive electrode of the dc operating voltage, the second diode-D2 is connected in parallel at two ends of the relay coil-KA 1, the cathode of the second diode-D2 is electrically connected with the anode of the direct current working voltage, and two ends of the relay contact-KA 1-1 are connected in parallel on the parallel current-sharing control interface 14. In this embodiment, a parallel current sharing interface 13, a parallel current sharing control interface 14 and a parallel network interface 15 are added in a power conversion module-MK 3 to enable an equivalent variable current power supply to realize a parallel function, a second diode-D2 is connected in parallel to two ends of a relay coil-KA 1 to clamp a back electromotive force generated when the relay coil-KA 1 is powered off, so as to protect a switching value output interface of a programmable controller-PLC 1, a parallel selector-SA 1 is used for starting the parallel function, the parallel selector-SA 1 is used for inputting a parallel starting signal to a programmable controller-PLC 1, the programmable controller-PLC 1 outputs a control signal to enable an intermediate relay to act after receiving the parallel starting signal, a relay contact-KA 1-1 is closed, and the power conversion module-MK 3 enters a parallel working mode, in the specific implementation, the parallel network interfaces 15 of the power conversion modules-MK 3 in the two equivalent variable current power supplies are connected in parallel, then the parallel current sharing interfaces 13 of the power conversion modules-MK 3 in the two equivalent variable current power supplies are connected in parallel, then the output power interfaces 2 of the power conversion modules-MK 3 in the two equivalent variable current power supplies are connected in parallel, which is equivalent to that two devices supply power to the same load, when in actual use, the two equivalent variable current power supplies are required to be started to be connected in parallel through the parallel selection switch-SA 1, the power conversion modules-MK 3 in the two devices are all in a parallel working mode, the two equivalent variable current power supplies are connected through the parallel network interfaces 15 to realize network communication, and the network communication can realize data exchange, in the embodiment, a judgment of a master slave machine exists in the two equivalent variable current power supplies, the started first can be used as a master machine, the host machine can be started through network communication, the slave machine is set only through a touch display-HMI (human machine interface) on the host machine when parameters are actually set, the slave machine does not need to be set, the slave machine is started along with the host machine and performs adaptive adjustment and output according to the voltage and current of the host machine, the two equivalent variable current power supplies are connected through the parallel current-sharing interface 13, so that the output voltage of the power conversion module-MK 3 in the two equivalent variable current power supplies is kept consistent, the parallel output can be well realized by connecting the two equivalent variable current power supplies in parallel through the technical scheme, the parallel output can play a role in stabilizing voltage and stabilizing current, the power supply can be better realized, and the actual use requirements can be better met. In specific implementation, two parallel network interfaces 15 of equivalent variable current power supplies are connected through CAT5E specification network cables, and are connected by adopting CAT5E specification network cables 568B. In the embodiment, the two equivalent variable current power supplies can be output in parallel through the distribution board, and the parallel current sharing coefficient is not lower than 90%. The CAT5E specification network cable and 568B connections are all referred to in the prior art and will not be further described herein.

Preferably, the current protection device further comprises a current protection device, the current protection device comprises a first fuse-FU 1, a second fuse-FU 2, a third fuse-FU 3, a fourth fuse-FU 4, a fifth fuse-FU 5, a sixth fuse-FU 6, a seventh fuse-FU 7 and an eighth fuse-FU 8, the first fuse-FU 1 and the second fuse-FU 2 are respectively connected in series to two incoming lines of the total power supply direct current voltage, the third fuse-FU 3 is connected in series to a positive incoming line end of the first input interface 4, the fourth fuse-FU 4 is connected in series to an incoming line end of the second input interface 11, an output end of the first diode-D1 is connected in series to the fifth fuse-FU 5, a negative electrode of the first output interface 5 is short-circuited with a negative electrode of the second output interface 12 and then connected in series to the sixth fuse-FU 6, the seventh fuse-FU 7 and the eighth fuse-FU 8 are respectively connected in series on two outlet ends of the output power interface 2. In the embodiment, the specification models of the first fuse-FU 1 and the second fuse-FU 2 are RL98B-100/63A, the specification models of the third fuse-FU 3 and the fourth fuse-FU 4 are RL98B-16/2A, the specification models of the fifth fuse-FU 5 and the sixth fuse-FU 6 are RL98B-16/4A, and the specification models of the seventh fuse-FU 7 and the eighth fuse-FU 8 are RL98B-63/63A, so that the current protection effect can be well realized by arranging the fuses.

As a preferable technical scheme, the heat dissipation device further comprises a heat dissipation module, wherein the heat dissipation module comprises a fan and a power indicator lamp-HL 1, the fan is connected in parallel with the power indicator lamp-HL 1, and the fan and the power indicator lamp-HL 1 are both powered by the direct-current working voltage. In the embodiment, the fans and the power indicator lamp HL1 are both directly powered by direct-current working voltage DC24V, the power indicator lamp HL1 is used for power input indication, two fans are arranged and connected in parallel, and the two fans can well play a role in heat dissipation. The fans include a first fan-M1 and a second fan-M2.

As a preferred technical solution, the programmable controller-PLC 1 is provided with two RS485 communication interfaces, wherein one RS485 communication interface is in communication connection with the first communication interface 3, and the other RS485 communication interface is used for connecting a higher-level monitoring device for communication. In this embodiment, two RS485 communication interfaces are required to be arranged on the programmable controller-PLC 1, since the programmable controller-PLC 1 adopts NHP3-32DT06MAD-D, a communication extension module-PLC 2 needs to be added, and the specification model is JP-NHP3-COM01, in specific implementation, the programmable controller-PLC 1 is in communication connection with the first communication interface 3 through the communication extension module-PLC 2, so that the working state information of the power conversion module-MK 3 can be conveniently read, the programmable controller-PLC 1 communicates with a superior monitoring device through the own RS485 communication interface to realize remote monitoring, the digitization and informatization levels of the device are effectively improved, and the working strength of operators can be reduced.

The parts not referred to in the present embodiment are the same as or can be implemented by the prior art, and will not be further described here.

The skilled person should understand that: although the present invention has been described in terms of the above embodiments, the inventive concept is not limited to this embodiment, and any modification which uses the inventive concept is intended to be included within the scope of the appended claims.

Claims

1. An equivalent variable current power supply, characterized by: the touch display comprises a power conversion module, a first power supply module, a detection module, a main control module, an input module, an output module and a touch display used for setting and displaying parameters, wherein the power conversion module is provided with a power input interface, an output power supply interface and a first communication interface, the first power supply module is provided with a first input interface and a first output interface, the detection module comprises a voltage sensor, the voltage sensor is provided with a first power supply interface, a voltage measurement interface and a signal output interface, the touch display is provided with a second power supply interface and a second communication interface, the input module comprises a plurality of control switches, the output module comprises an alarm device, the power input interface and the first input interface both input total power supply direct current voltage, the output power supply interface outputs adjustable direct current voltage, and the first communication interface and the second communication interface both are in communication connection with the main control module, the first output interface outputs direct-current working voltage, the first power supply interface, the second power supply interface and the main control module are all connected into the direct-current working voltage to supply power, the voltage measurement interface is connected to the power input interface in parallel, the main control module is electrically connected with the signal output interface, the input module and the output module, and the input module and the output module are electrically connected with the anode of the direct-current working voltage.

2. An equivalent variable current power supply as claimed in claim 1, wherein: the main control module adopts a programmable controller, the programmable controller is in communication connection with the first communication interface through an RS485 communication interface, a power input end of the programmable controller is connected with the direct-current working voltage, the input module is electrically connected with a switching value input interface of the programmable controller, the output module is electrically connected with a switching value output interface of the programmable controller, and the signal output interface is electrically connected with an analog value input/output interface of the programmable controller.

3. An equivalent variable current power supply as claimed in claim 2, wherein: the input module comprises a starting switch, a stopping switch and an alarm eliminating switch, the starting switch is a first button, the stop switch is a second button, the alarm eliminating switch is a third button, one end of each of the first button, the second button and the third button is electrically connected with the anode of the direct current working voltage, the other end of each of the first button, the second button and the third button is respectively used as one input and is respectively electrically connected with a switching value input interface of the programmable controller, the first button is a button with a lamp, the first button is provided with an operation indicator lamp, the output module comprises an alarm indicator lamp and an alarm buzzer, and three paths of outputs of the switching value output interface are respectively and electrically connected with one ends of the operation indicator lamp, the alarm indicator lamp and the alarm buzzer, and the other ends of the operation indicator lamp, the alarm indicator lamp and the alarm buzzer are electrically connected with the anode of the direct-current working voltage.

4. An equivalent variable current power supply as claimed in claim 3, wherein: still include second power module and first diode, the second power module has second input interface and second output interface, second input interface inserts auxiliary power, auxiliary power is AC220V, first diode has two inputs and an output, and two inputs divide into first input and second input, the anodal electricity of first output interface is connected first input, the anodal electricity of second output interface is connected the second input, the output of first diode is regarded as direct current operating voltage's positive pole, the negative pole of first output interface with regard as behind the negative pole short circuit of second output interface direct current operating voltage's negative pole.

5. An equivalent variable current power supply as claimed in claim 4, wherein: the power conversion module is also provided with a parallel current sharing interface, a parallel current sharing control interface and a parallel network interface, the input module also comprises a parallel connection selection switch, the output module also comprises an intermediate relay and a second diode, the parallel connection selection switch is a short handle knob, one end of the parallel connection selection switch is electrically connected with the positive pole of the direct current working voltage, the other end of the parallel connection selection switch is used as a path of input to be electrically connected with a switching value input interface of the programmable controller, the intermediate relay comprises a relay coil and a relay contact, one path of output of the switching value output interface is electrically connected with one end of the relay coil, the other end of the relay coil is electrically connected with the anode of the direct-current working voltage, the second diode is connected in parallel at two ends of the relay coil, a negative pole of the second diode is electrically connected with a positive pole of the direct current working voltage, and two ends of the relay contact are connected in parallel on the parallel current-sharing control interface.

6. An equivalent variable current power supply according to claim 5, wherein: still include the electric current protection device, the electric current protection device includes first fuse, second fuse, third fuse, fourth fuse, fifth fuse, sixth fuse, seventh fuse and eighth fuse, first fuse and second fuse are established ties respectively on two inlet terminals of mains DC voltage, the third fuse is established ties the positive inlet wire end of first input interface, the fourth fuse is established ties the live wire inlet wire end of second input interface, the output of first diode is established ties the fifth fuse, the negative pole of first output interface with establish ties behind the negative pole short circuit of second output interface the sixth fuse, seventh fuse and eighth fuse are established ties respectively on two outlet terminals of output power interface.

7. An equivalent variable current power supply as claimed in claim 6, wherein: the fan is connected with the power indicator in parallel, and the fan and the power indicator are supplied with power by the direct-current working voltage.

8. An equivalent variable current power supply according to any one of claims 2 to 7, wherein: the programmable controller is provided with two paths of RS485 communication interfaces, one path of RS485 communication interface is in communication connection with the first communication interface, and the other path of RS485 communication interface is used for being connected with superior monitoring equipment for communication.