CN212649377U

CN212649377U - DC400V-DC1000V wide voltage range input inverter

Info

Publication number: CN212649377U
Application number: CN202021633529.4U
Authority: CN
Inventors: 王斌赞; 阳刚; 罗春晖
Original assignee: Shenzhen Xingdian Technology Co ltd
Current assignee: Shenzhen Xingdian Technology Co ltd
Priority date: 2020-08-08
Filing date: 2020-08-08
Publication date: 2021-03-02
Anticipated expiration: 2030-08-08

Abstract

The utility model discloses a DC400V-DC1000V wide voltage range input DC-to-ac converter, concretely relates to DC-to-ac converter technical field, including the DC-to-ac converter main part, DC-to-ac converter main part receiving terminal is connected with input voltage detection module, DC-to-ac converter main part output is connected with output isolation transformer, output isolation transformer output is connected with output feedback respectively and keeps apart detection module and output voltage current detection module, output feedback keeps apart the detection module output and is connected with SPWM control circuit. The utility model discloses a high voltage direct current remote supply power supply mode steps up the alternating current rectification into the direct current through the local side equipment at the power distribution room, then the remote step-down contravariant equipment that the electrical equipment along the line carried to the twin-core cable carries out the voltage step-down contravariant, gives equipment power supply along the line, effectively reduces cable laying cost, receives with pipeline cable electromagnetic interference influence little, the invertion power supply of great range input makes the voltage drop along the line change of better use cable.

Description

DC400V-DC1000V wide voltage range input inverter

Technical Field

The embodiment of the utility model provides a relate to inverter technical field, concretely relates to DC400V-DC1000V wide voltage range input inverter.

Background

The DC400V-DC1000V wide input range inverter is one of the main components of a DC remote power supply system generated for adapting to the intelligent development of a highway, and can provide AC220V power supply for electric equipment along the highway, including provincial toll stations, whole-process monitoring, real-time image conditions, vehicle flow and flow speed detection, emergency telephone and environment monitoring, variable information boards and other systems. The conventional power supply of electric equipment along the highway comprises the following steps: the direct alternating current power supply, the power supply of the larger power equipment such as the information board and the like at present, the power supply of the equipment such as the remote information board and the like from an expressway toll station or a transformer substation along the line is generally adopted; the method is characterized by comprising the following steps of supplying power by using new energy, wherein the new energy comprises wind-solar complementary power supply and solar power supply, the wind-solar complementary power supply is new energy power supply combining wind power generation and solar power generation, and the method is low-carbon, environment-friendly, energy-saving and emission-reducing; the alternating-current remote power supply is similar to the direct-current remote power supply, the voltage of the local side is increased, and the voltage of the electric equipment along the highway is reduced. The difference with direct current is that alternating current high voltage is adopted in the electric energy transmission process, and the alternating current has equivalent inductive reactance in addition to the impedance of the equivalent resistance of the cable in the transmission process, so the loss along the line is slightly larger than the direct current.

The prior art has the following defects: the existing power supply mode for highway electric equipment comprises the following steps: the cable laying cost is high, the influence of electromagnetic interference of cables in the same pipeline is large, and the voltage drop change along the cable cannot be better used.

Therefore, it is desirable to invent a wide voltage range input inverter from DC400V to DC 1000V.

SUMMERY OF THE UTILITY MODEL

Therefore, the embodiment of the utility model provides a DC400V-DC1000V wide voltage range input DC-to-ac converter, supply the power supply mode far away through the high voltage direct current, it steps up into the direct current to join in marriage the power supply room through the office end equipment with the alternating current rectification, then the remote step-down contravariant equipment that the twin-core cable carried along with electric equipment carries out the voltage step-down contravariant, give along with the equipment power supply of equipment power supply, compared with the prior art, effectively reduce cable laying cost, it is little influenced by same pipeline cable electromagnetic interference, the inverter power supply of great range input makes the voltage drop along the line change of better use cable, with solving among the prior art cable laying cost height, it is big influenced by same pipeline cable electromagnetic interference, the problem that the voltage drop along the line of use cable that can not be better changes.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions: DC400V-DC1000V wide voltage range input inverter, including the DC-to-ac converter main part, DC-to-ac converter main part receiving terminal is connected with input voltage detection module, DC-to-ac converter main part output is connected with output isolation transformer, output isolation transformer output is connected with output feedback isolation detection module and output voltage current detection module respectively, output feedback isolation detection module output is connected with SPWM control circuit, SPWM control circuit output is connected with a plurality of network communication units and a driver isolated power respectively, driver isolated power receiving terminal is connected with auxiliary switch power supply, auxiliary switch power supply output is connected with the door driver, the door driver output is connected with the DC-to-ac converter main part.

Further, the auxiliary switching power supply is used for taking power on the direct current bus and converting a direct current high voltage into a voltage of the DC 24V.

Furthermore, the SPWM control circuit is used for generating a control signal and receiving a feedback signal to control a core device of the whole machine to operate.

Further, the inverter main body is an H-bridge conversion circuit composed of four paths of IGBTs.

Furthermore, the output isolation transformer is a power frequency transformer, is arranged on the output side and is used for reducing the transmission of harmonic waves generated by the switch to electric equipment during inversion and removing the direct current component of the inverted sine wave.

Further, the network communication unit is composed of a plurality of road displays with different functions.

Further, the inverter main body is connected with a rectification and boosting local side through a transmission cable.

The embodiment of the utility model provides a have following advantage:

through the high voltage direct current long-distance power supply mode, the power distribution room is with the alternating current rectification step-up into the direct current through local side equipment, then the remote step-down contravariant equipment that the twin-core cable carried along the line consumer carries out the voltage step-down contravariant, give along the line equipment power supply, compare with prior art, effectively reduce the cable and lay the cost, it is little influenced by same pipeline cable electromagnetic interference, the invertion power supply of great wide range input makes the voltage drop along the line of better use cable change.

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. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.

Fig. 1 is a diagram of a dc remote power supply system provided by the present invention;

fig. 2 is a structural block diagram of the overall structure provided by the present invention;

fig. 3 is a current diagram of the energy storage capacitor according to the present invention;

fig. 4 is an isolated driving current diagram provided by the present invention;

fig. 5 is an isolated driving current diagram provided by the present invention;

in the figure: the system comprises an inverter main body 1, a 3-gate driver, a 4-driver isolation power supply, a 5-auxiliary switching power supply, a 6SPWM control circuit, a 7-output feedback isolation detection module, an 8-input voltage detection module, a 9-output isolation transformer, a 10-output voltage and current detection module and an 11-network communication unit.

Detailed Description

The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to the attached drawings 1-5 of the specification, the wide voltage range input inverter of DC400V-DC1000V of this embodiment includes an inverter body 1, the inverter body 1 controls the signal to be in the periodic on-off state, so as to generate the sine wave with fixed voltage, the energy storage capacitor, the capacitor is at the input side of the DC bus, it is difficult to find the large capacity capacitor with 1000V withstand voltage in the market, then the capacitor parallel connection mode is adopted, and the voltage equalizing resistor is equipped, so that the voltage on each capacitor is approximately equal, and the service life is not shortened or the maximum withstand voltage value is not burst due to the different equivalent resistance of each capacitor, the service life of the utility model is prolonged, the receiving end of the inverter body 1 is connected with an input voltage detection module 8, the output end of the inverter body 1 is connected with an output isolation transformer 9, the isolation transformer 9 is an, the output end of the output isolation transformer 9 is respectively connected with an output feedback isolation detection module 7 and an output voltage and current detection module 10, the output end of the output feedback isolation detection module 7 is connected with an SPWM control circuit 6, the SPWM control circuit 6 is a core device which generates a control signal and receives the feedback signal to control the operation of the whole machine, signals controlled by the SPWM control circuit 6 are divided into four paths to drive four bridge arms of an H bridge inverter through a driver isolation power supply 4, and the output isolation transformer has the functions of voltage detection, output voltage feedback and temperature detection input interfaces, the output end of the SPWM control circuit 6 is respectively connected with a plurality of network communication units 11 and a driver isolation power supply 4, in order to adapt to high-voltage wide-range voltage input, an inverter different from low-voltage 600V is designed, a high-voltage-resistant driving chip can be directly adopted to solve the driving problem, four-way isolation driving is adopted to drive inversion of an H bridge, the part mainly comprises an optocoupler isolator and an isolation power supply suitable for IGBT voltage grade, four-way SPWM signals are respectively driven to drive four IGBT arms of the H bridge through four-way isolation driving, so that the signal of the SPWM control circuit 6 is transmitted to the H bridge at a high-voltage side in an isolation mode to control inversion of direct current voltage, the high-voltage part does not generate interference on a weak current control part, the receiving end of the driver isolation power supply 4 is connected with an auxiliary switch power supply 5, the auxiliary switch power supply 5 takes electricity from a direct current bus, and converts the, the controller is converted into to linear regulator (LDO) again, keeps apart the available grade voltage of power, the 5 output of auxiliary switch power is connected with

gate driver

3, 3 output of gate driver are connected with dc-to-ac converter main part 1, and the very high contravariant of input voltage is realized to cooperation local side equipment to reach the transmission of more remote distance, with this purpose of realizing long distance transmission, the very wide contravariant of input voltage range has reached a local side and has given the distal end power supply of a plurality of unable powers, adopts high frequency drive, has effectively increased inverter power supply's power density, adopts the little component of heating element after that, makes conversion efficiency effectively promote.

Further, the auxiliary switching power supply 5 is used for taking power on the DC bus and converting a DC high voltage into a voltage of DC 24V.

Further, the SPWM control circuit 6 is used for generating a control signal, and receiving a feedback signal to control a core device of the whole machine.

Further, the inverter body 1 is an H-bridge conversion circuit composed of four IGBT paths.

Furthermore, the output isolation transformer 9 is a power frequency transformer, is disposed on the output side, and is used for reducing transmission of harmonic waves generated by the switch to the electric equipment during inversion, and removing direct current components of the inverted sine waves.

Further, the network communication unit 11 is composed of a plurality of road displays with different functions, and road information, speed limit prompts and road condition shooting can be provided for vehicles running on the road through the plurality of displays.

Further, the inverter main body 1 is connected to a rectification and boosting office through a transmission cable.

Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

A DC400V-DC1000V wide voltage range input inverter, comprising an inverter body (1), characterized in that: the utility model discloses a high-voltage direct current drive inverter, including inverter main part (1), inverter main part (1) receiving end, output isolation transformer (9) output is connected with output feedback isolation detection module (7) and output voltage current detection module (10) respectively, output feedback isolation detection module (7) output is connected with SPWM control circuit (6), SPWM control circuit (6) output is connected with a plurality of network communication unit (11) and a driver isolation power supply (4) respectively, driver isolation power supply (4) receiving end is connected with auxiliary switch power supply (5), auxiliary switch power supply (5) output is connected with door driver (3), door driver (3) output is connected with inverter main part (1).
2. The DC400V-DC1000V wide voltage range input inverter of claim 1, wherein: the auxiliary switching power supply (5) is used for taking power on a direct current bus and converting direct current high voltage into voltage of DC 24V.
3. The DC400V-DC1000V wide voltage range input inverter of claim 1, wherein: the SPWM control circuit (6) is used for generating a control signal and receiving a feedback signal to control a core device of the whole machine to operate.
4. The DC400V-DC1000V wide voltage range input inverter of claim 1, wherein: the inverter main body (1) is an H-bridge conversion circuit formed by four paths of IGBTs.
5. The DC400V-DC1000V wide voltage range input inverter of claim 1, wherein: the output isolation transformer (9) is a power frequency transformer, is arranged on the output side and is used for reducing the transmission of harmonic waves generated by a switch to electric equipment during inversion and removing the direct current component of an inverted sine wave.
6. The DC400V-DC1000V wide voltage range input inverter of claim 1, wherein: the network communication unit (11) is composed of a plurality of road displays with different functions.
7. The DC400V-DC1000V wide voltage range input inverter of claim 1, wherein: the inverter main body (1) is connected with a rectification and boosting local end through a transmission cable.