CN216699861U

CN216699861U - DC-AC inverter

Info

Publication number: CN216699861U
Application number: CN202123393127.9U
Authority: CN
Inventors: 陈涛; 巩晨赟; 曾焕能
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: 2022-06-07
Anticipated expiration: 2031-12-29

Abstract

The utility model relates to the field of power electronics, in particular to a DC-AC inverter which comprises a power conversion module, a working power supply module, an input voltage detection module, an output voltage processing module, a main control module, an input module, an output module and a touch display, wherein the power conversion module is provided with a power input interface, an output power supply interface, a first communication interface and a signal sampling interface, the working power supply module is provided with a first input interface and a first output interface, the touch display is provided with a first 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 output voltage processing module is electrically connected with the signal sampling interface, the first communication interface and the second communication interface are both in communication connection with the main control module, the input voltage detection module is connected to the power input interface in parallel, the main control module is electrically connected with the input voltage detection module, An input module and an output module. The utility model has reasonable structure, can stably output AC380V and can send out alarm in time when abnormity occurs.

Description

DC-AC inverter

Technical Field

The utility model relates to the technical field of power electronics, in particular to a DC-AC inverter.

Background

The main function of the DC-AC inverter is to convert DC700-DC1000V DC bus voltage into AC380V stable voltage output and provide AC380V AC power for a DC regional distribution system.

Most of the existing DC-AC inverters are complex in design, AC380V alternating current power cannot be conveniently and stably output, the existing DC-AC inverters do not have an alarm function and cannot give an alarm in time when the DC-AC inverters are abnormal, and therefore great inconvenience is brought to actual use of an equivalent variable current power supply. The present invention improves upon the above-mentioned deficiencies.

Disclosure of Invention

In order to overcome the defects of the background technology, the DC-AC inverter provided by the utility model has reasonable structural design, can stably output AC380V after outputting three-phase alternating-current voltage through the output power interface of the power conversion module and processing the three-phase alternating-current voltage by the output voltage processing module, and can give an alarm in time when abnormality occurs, so that the actual use requirements can be better met.

The technical scheme adopted by the utility model is as follows: a DC-AC inverter comprises a power conversion module, a working power supply module, an input voltage detection module, an output voltage processing 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, a first communication interface and a signal sampling interface, the working power supply module is provided with a first input interface and a first output interface, the touch display is provided with a first 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 three-phase alternating current voltage, the output power supply interface is electrically connected with the output voltage processing module, and the output voltage processing module is also electrically connected with the signal sampling interface, the first communication interface and the second communication interface are in communication connection with the main control module, the first output interface outputs direct-current working voltage, the first power supply interface, the input voltage detection module and the main control module are all connected into the direct-current working voltage for power supply, the input voltage detection module is connected in parallel to the power input interface, the main control module is electrically connected with the input voltage detection module, 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.

Preferably, the output voltage processing module includes a transformer and a passive filter, the transformer is a step-up transformer, an input side of the transformer is electrically connected to the output power interface, an output side of the transformer is electrically connected to an input end of the passive filter and the signal sampling interface, and an output end of the passive filter outputs a three-phase alternating-current voltage.

Preferably, still including the first diode that is used for the isolation, the power input interface sets up two way input interfaces side by side, and two way total power direct current voltage are imported respectively to two way input interfaces, and two way total power direct current voltage is provided by 1# power and 2# power respectively, first diode has two inputs and an output, and the positive pole of 1# power and 2# power is connected to two inputs of first diode electricity respectively, and the output electricity of first diode is connected the positive pole of first input interface, electricity connection after the negative pole short circuit of 1# power and 2# power the negative pole of first input interface.

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, and the output module is electrically connected to a switching value 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, the input voltage detection module includes two voltage sensor, divide into first voltage sensor and second voltage sensor, voltage sensor has power supply interface, voltage measurement interface and signal output interface, and first voltage sensor and second voltage sensor's power supply interface all inputs direct current operating voltage, first voltage sensor's voltage measurement interface is parallelly connected on power input interface of the same kind of power conversion module, second voltage sensor's voltage measurement interface is parallelly connected on another way power input interface of power conversion module, first voltage sensor and second voltage sensor's signal output interface electricity respectively connects programmable controller's analog quantity input output 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, eighth fuse, ninth fuse, tenth fuse and eleventh fuse, first fuse and second fuse establish ties respectively on two inlet terminals of 1# power, third fuse and fourth fuse establish ties respectively on two inlet terminals of 2# power, the fifth fuse establishes ties the anodal inlet terminal of first input interface, the sixth fuse establishes ties the negative pole inlet terminal of first input interface, the anodal outlet terminal of first output interface establishes ties the seventh fuse, the negative pole outlet terminal of first output interface establishes ties the eighth fuse, the ninth fuse, And the tenth fuse and the eleventh fuse are respectively connected in series on three outlet ends of the passive filter.

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:

the DC-AC inverter comprises a power conversion module, a working power supply module, an input voltage detection module, an output voltage processing module, a main control module, an input module, an output module and a touch display for setting and displaying parameters, and has reasonable structural design, can conveniently and stably output AC380V, and can timely give an alarm when abnormity occurs, thereby better meeting the actual use requirement;

2. the output voltage processing module comprises a transformer and a passive filter, voltage transformation can be realized by arranging the transformer, an isolation effect can be well played, certain harmonic wave or multiple harmonic waves can be well filtered by arranging the passive filter, AC380V electric energy can be favorably and better output, the output side of the transformer is electrically connected with a signal sampling interface of the power transformation module, signal sampling can be conveniently carried out, and output voltage and current information can be collected in real time;

3. two way input power is provided for power conversion module through 1# power and 2# power, can realize dual supply input function, can satisfy the in-service use demand better, can keep apart the positive pole of 1# power and 2# power through addding first diode, can play the effect of two powers of protection, the direct short circuit of the negative pole of 1# power and 2# power, there is not the voltage difference between the negative pole, so can not lead to the fact the damage to the power.

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;

the label in the figure is 1-power input interface, 2-output power interface, 3-first communication interface, 4-signal sampling interface, 5-first input interface, 6-first output interface, 7-first power supply interface, 8-second communication interface;

-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, -FU 9: ninth fuse, -FU 10: tenth fuse, -FU 11: an eleventh fuse, -D1, a 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: working power supply module, -T: transformer, -LC 1: passive filter, -PLC 1: programmable controller, -PLC 2: communication extension module, -MK 2: power conversion module, -HMI: touch display, -U1: first voltage sensor, -U2: second voltage sensor, -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 2 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 fig. 2, the DC-AC inverter disclosed in this embodiment includes a power conversion module-MK 2, a working power supply module-MK 1, an input voltage detection module, an output voltage processing 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 2 has a power input interface 1, an output power interface 2, a first communication interface 3, and a signal sampling interface 4, the working power supply module-MK 1 has a first input interface 5 and a first output interface 6, the touch display-HMI has a first power supply interface 7 and a second communication interface 8, the input module includes a plurality of control switches, the output module includes an alarm device, and the power input interface 1 and the first input interface 5 both input a total power supply DC voltage, output power source interface 2 output three-phase alternating voltage, output power source interface 2 electricity is connected output voltage processing module, output voltage processing module still electricity are connected signal sampling interface 4, first communication interface 3 and second communication interface 8 all with host system communication connection, first output interface 6 output direct current operating voltage, first power supply interface 7, input voltage detection module and host system all insert direct current operating voltage supplies power, input voltage detection module connects in parallel on the power input interface 1, the host system electricity is connected input voltage detection module, input module and output module all electricity are connected direct current operating voltage's positive pole.

In the technical scheme, the input total power supply direct current voltage is DC1000V, AC380V is output through an output power interface 2 and can be more stably output AC380V after being processed by an output voltage processing module, a first output interface 6 of a working power module-MK 1 outputs DC24V as direct current working voltage, a signal sampling interface 4 is arranged on a power conversion module-MK 2 for conveniently sampling signals, the main control module is in communication connection with a first communication interface 3 and can be conveniently communicated with the power conversion module-MK 2, the main control module is in communication connection with a second communication interface 8 and can be conveniently communicated with a touch display-HMI (human machine interface), the main control module can read the working state information of the power conversion module-MK 2 and then can display the working state information on the touch display-HMI, and the power supply voltage and the power supply current at the output side of the power conversion module-MK 2 can be displayed on the touch display-HMI, the power conversion module-MK 2 can be controlled by touching the display-HMI setting parameters, such as setting the operating state (start or stop), setting voltage, setting current, soft-start time, etc., the input voltage detection module measures the voltage at the input side of the power conversion module-MK 2, and outputs a signal to the main control module, the main control module is used for operating and processing the signals, not only can display the input voltage on the touch display-HMI, but also can control the alarm prompt of the input under-voltage state, the alarm prompt is realized by controlling the alarm device to give out the alarm, the input module comprises a plurality of control switches, the manual control can be conveniently realized, therefore, the DC-AC inverter is reasonable in design, can conveniently and stably output the AC380V, and can give an alarm in time when an abnormity occurs, so that the actual use requirement can be better met. In the specific implementation of the embodiment, the capacity of the power conversion module-MK 2 is 10kW, which is referred to the prior art and will not be further described herein; the specification model of the working power supply module MK1 is PDB150-900S24-N, the input DC is 600-1100V, and the output DC is 24V. During specific implementation, the power conversion module-MK 2 can acquire output voltage and current information in real time through signal sampling and send the signals to the main control module through communication, and the main control module performs operation processing on the signals and controls alarm prompt on output overvoltage state, output low-voltage state and output overload state. The touch display HMI can refer to the prior art and is not further described here. In specific implementation, the power conversion module-MK 2 includes an auxiliary power supply, a power conversion unit and a control signal unit, wherein for the auxiliary power supply, considering that the input direct-current voltage is 700V-1000V higher, the auxiliary power supply selects a mature power supply module, inputs DC600-1100V, outputs DC24V, and has power of 25W, and the dual-module redundancy is used for supplying power to the control board, and for the power conversion unit, the following design is preferred: the control signal unit adopts an ARM32 bit processor, carries out high-speed sampling on output voltage and current, outputs SPWM modulated waves to drive an IGBT module (FF 150R17KE 4), outputs SPWM waves, and outputs pure sine waves after inductive filtering.

Preferably, the output voltage processing module comprises a transformer-T and a passive filter-LC 1, the transformer-T is a step-up transformer-T, an input side of the transformer-T is electrically connected to the output power interface 2, an output side of the transformer-T is electrically connected to the input end of the passive filter-LC 1 and the signal sampling interface 4, and an output end of the passive filter-LC 1 outputs a three-phase alternating-current voltage. In the embodiment, voltage conversion can be realized by arranging the transformer-T, an isolation effect can be well played, one or more times of harmonic waves can be well filtered by arranging the passive filter-LC 1, AC380V electric energy can be favorably and better output, the signal sampling interface 4 of the power conversion module-MK 2 is electrically connected to the output side of the transformer-T, signal sampling can be conveniently carried out, and output voltage and current information can be collected in real time. In specific implementation, the specification model of the transformer-T is AC340V/AC400V, and the specification model of the passive filter-LC 1 is ADL-HF-15/0.4.

As a preferable technical solution, the power supply further comprises a first diode-D1 for isolation, the power supply input interface 1 is provided with two input interfaces side by side, the two input interfaces respectively input two main power dc voltages, the two main power dc voltages are respectively provided by a 1# power supply and a 2# power supply, the first diode-D1 has two input ends and an output end, the two input ends of the first diode-D1 are respectively electrically connected with the anodes of the 1# power supply and the 2# power supply, the output end of the first diode-D1 is electrically connected with the anode of the first input interface 5, and the cathodes of the 1# power supply and the 2# power supply are electrically connected with the cathode of the first input interface 5 after short circuit. The embodiment provides two paths of input power supplies for the power conversion module-MK 2, namely, the dual-power input function can be realized, the actual use requirement can be better met, the anodes of the 1# power supply and the 2# power supply can be isolated by additionally arranging the first diode-D1, the two power supplies can be protected, the cathodes of the 1# power supply and the 2# power supply are directly short-circuited, no voltage difference exists between the cathodes, and therefore the power supplies cannot be damaged. During specific implementation, the two input power supplies are respectively provided with a guide diode, and the guide diodes determine which power supply supplies power. The specification model of the first diode-D1 is MDK 25/2000V.

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, and the output module is electrically connected to a switching value 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 2, 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, the input voltage detection module can be conveniently and electrically connected to transmit the detection signal to the programmable logic controller-PLC 1 for operation processing.

Preferably, the input module comprises a start switch, a stop switch and an alarm elimination switch, the start switch is a first button-SB 1, the stop switch is a second button-SB 2, the alarm elimination 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 2, the PLC1, after receiving the start signal, controls the power conversion module-MK 2 to perform power conversion and output three-phase ac voltage, meanwhile, the PLC1 also controls the lighting of the operation indicator light-HL (SB 1) through one path of output of the switching value output interface, the second button-SB 2 is used to input a stop signal to the PLC1, the stop signal is used to control the power conversion module-MK 2 to stop output, and the PLC1, when detecting an abnormality, controls the turn-on alarm through two paths of output of the switching value output interface respectively Alarm indicator lamp-HL 2 and alarm buzzer-HAU 1, so as to realize alarm prompt, the third button-SB 3 is used for inputting alarm eliminating signal to the programmable controller-PLC 1, and the programmable controller-PLC 1 respectively controls the alarm stopping indicator lamp-HL 2 and the alarm buzzer-HAU 1 through two-way output of the switching value output interface after receiving the alarm eliminating signal, so as to realize alarm elimination.

Preferably, the input voltage detection module comprises two voltage sensors, which are divided into a first voltage sensor-U1 and a second voltage sensor-U2, the voltage sensor is provided with a power supply interface, a voltage measurement interface and a signal output interface, the power supply interfaces of the first voltage sensor-U1 and the second voltage sensor-U2 are all used for inputting the direct-current working voltage, the voltage measurement interface of the first voltage sensor-U1 is connected in parallel to one power supply input interface 1 of the power conversion module-MK 2, the voltage measurement interface of the second voltage sensor-U2 is connected in parallel to the other power supply input interface 1 of the power conversion module-MK 2, and the signal output interfaces of the first voltage sensor-U1 and the second voltage sensor-U2 are respectively and electrically connected with the analog quantity input and output interface of the programmable controller-PLC 1. In the embodiment, the two voltage sensors respectively measure the voltage of two input interfaces of the power conversion module-MK 2 through the voltage measurement interface, output signals to the programmable controller-PLC 1 through the signal output interface, and perform operation processing on sensor signals through the programmable controller-PLC 1, so that the input voltage can be displayed on the touch display-HMI, and the alarm prompt of the input under-voltage state can be controlled, wherein the alarm prompt is realized by controlling the operation of the alarm indicator lamp-HL 2 and the alarm buzzer-HAU 1. The specification model of the voltage sensor is WBV342U05-S, and the working power supply: DC24V, measurement range: DC0-1000V, output signal: 0-5V.

Preferably, the 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, an eighth fuse-FU 8, a ninth fuse-FU 9, a tenth fuse-FU 10 and an eleventh fuse-FU 11, the first fuse-FU 1 and the second fuse-FU 2 are respectively connected in series to two incoming lines of the No. 1 power supply, the third fuse-FU 3 and the fourth fuse-FU 4 are respectively connected in series to two incoming lines of the No. 2 power supply, the fifth fuse-FU 5 is connected in series to a positive incoming line end of the first input interface 5, the sixth fuse-FU 6 is connected in series to a negative incoming line end of the first input interface 5, the positive leading-out terminal of the first output interface 6 is connected in series with the seventh fuse-FU 7, the negative leading-out terminal of the first output interface 6 is connected in series with the eighth fuse-FU 8, and the ninth fuse-FU 9, the tenth fuse-FU 10 and the eleventh fuse-FU 11 are respectively connected in series with three leading-out terminals of the passive filter-LC 1. In the embodiment, the specification models of the first fuse-FU 1, the second fuse-FU 2, the third fuse-FU 3 and the fourth fuse-FU 4 are RL98B-32/20A, the specification models of the fifth fuse-FU 5 and the sixth fuse-FU 6 are RL98B-16/2A, the specification models of the seventh fuse-FU 7 and the eighth fuse-FU 8 are RL98B-16/4A, and the specification models of the ninth fuse-FU 9, the tenth fuse-FU 10 and the eleventh fuse-FU 11 are RL98B-63/25A, and the fuses can respectively play a good current protection role.

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 2 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 following table is a reference table for the first part of the external wiring diagram of the present invention:

the following table is a reference table for the second part of the external wiring diagram of the present invention:

Figure DEST_PATH_990246DEST_PATH_IMAGE002

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. A DC-AC inverter characterized by: the touch display device comprises a power conversion module, a working power supply module, an input voltage detection module, an output voltage processing module, a master 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, a first communication interface and a signal sampling interface, the working power supply module is provided with a first input interface and a first output interface, the touch display is provided with a first 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 input total power supply direct current voltage, the output power supply interface outputs three-phase voltage, the output power supply interface is electrically connected with the output voltage processing module, and the output voltage processing module is also electrically connected with the signal sampling interface, the first communication interface and the second communication interface are in communication connection with the main control module, the first output interface outputs direct-current working voltage, the first power supply interface, the input voltage detection module and the main control module are all connected into the direct-current working voltage for power supply, the input voltage detection module is connected in parallel to the power input interface, the main control module is electrically connected with the input voltage detection module, 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.

2. A DC-AC inverter according to claim 1, wherein: the output voltage processing module comprises a transformer and a passive filter, the transformer is a step-up transformer, the input side of the transformer is electrically connected with the output power interface, the output side of the transformer is electrically connected with the input end of the passive filter and the signal sampling interface, and the output end of the passive filter outputs three-phase alternating-current voltage.

3. A DC-AC inverter as claimed in claim 2, wherein: still including the first diode that is used for the isolation, the power input interface sets up two way input interfaces side by side, and two way total power DC voltage is inputed respectively to two way input interfaces, and two way total power DC voltage is provided by 1# power and 2# power respectively, first diode has two inputs and an output, and two inputs of first diode are the positive pole of electricity connection 1# power and 2# power respectively, and the output electricity of first diode is connected the positive pole of first input interface, electricity connection behind the negative pole short circuit of 1# power and 2# power the negative pole of first input interface.

4. A DC-AC inverter as claimed in claim 3, 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, and the output module is electrically connected with a switching value output interface of the programmable controller.

5. A DC-AC inverter as claimed in claim 4, 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 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.

6. A DC-AC inverter as claimed in claim 5, wherein: the input voltage detection module comprises two voltage sensors, and is divided into a first voltage sensor and a second voltage sensor, the voltage sensors are provided with a power supply interface, a voltage measurement interface and a signal output interface, the power supply interfaces of the first voltage sensor and the second voltage sensor are all input with direct current working voltage, the voltage measurement interface of the first voltage sensor is connected in parallel on one path of power input interface of the power conversion module, the voltage measurement interface of the second voltage sensor is connected in parallel on the other path of power input interface of the power conversion module, and the signal output interfaces of the first voltage sensor and the second voltage sensor are respectively and electrically connected with the analog input and output interface of the programmable controller.

7. A DC-AC inverter according to claim 6, 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, eighth fuse, ninth fuse, tenth fuse and eleventh fuse, first fuse and second fuse establish ties respectively on two inlet wires of 1# power end, third fuse and fourth fuse establish ties respectively on two inlet wires of 2# power end, fifth fuse establishes ties and is in the positive inlet wire end of first input interface, sixth fuse establishes ties the negative pole inlet wire end of first input interface, the positive leading-out terminal of first output interface establishes ties the seventh fuse, the negative pole leading-out terminal of first output interface establishes ties the eighth fuse, ninth fuse, And the tenth fuse and the eleventh fuse are respectively connected in series on three outlet ends of the passive filter.

8. A DC-AC inverter as claimed in claim 7, 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.

9. A DC-AC inverter according to any one of claims 4-8, characterized in that: 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.