CN200959569Y

CN200959569Y - Inverse-outputting filter

Info

Publication number: CN200959569Y
Application number: CN 200620108315
Authority: CN
Inventors: 罗勇; 李新范; 李卫东; 卢长根
Original assignee: Ningbo CSR Times Transducer Technology Co Ltd
Current assignee: Ningbo CRRC Times Transducer Technology Co Ltd
Priority date: 2006-09-29
Filing date: 2006-09-29
Publication date: 2007-10-10
Anticipated expiration: 2016-09-29

Abstract

The utility model discloses an inverted output filter, the three-phase magnetic core coil component of the filter is arranged with the same air gap in equal distance, the upper and lower of the three-phase magnetic core coil component are separately arranged with insulated upper and lower magnetic yokes and an air gap insulated gasket is padded between the upper and lower magnetic yokes, which are connected into one body in series by a connection plate, and the extraction conductor of each phase of the magnetic core coil component is separately connected with two parallel high voltage electrodeless capacitance and outputs three-phase sine wave with 50Hz. The design is additionally arranged on the output terminal of the inverted power supply to filter the SPWM waveform with the carrier frequency of 1KHz to 16KHz and the fundamental frequency of 50Hz to voltage waveform similar to sine 50 Hz, the THD value of the output voltage is below 5 percent, the structure is simple, reliability is high, capacity is large, phenomena such as overvoltage in motor terminal, damage of motor insulation, burst of the cable and so on are avoided from arising when any long wire cables are used in transmission, the use as the power supply of the railway air conditioning coach can eliminate the higher harmonic of the coach inverted power supply and improve the load carrying ability of the power supply.

Description

The inversion output filter

Technical field

The utility model relates to the inversion output filter of using in a kind of power industry and the Electric Drive.

Background technology

In the modern industry field, inversion, the application of converter technique more and more widely, the develop rapidly of modern power electronic device makes the operation of high-speed switching devices become the performance that may and improve inverter, reduced switching loss, along with significantly improving of switching frequency, the negative effect of inverter is obvious further, the output that is inverter contains high-frequency harmonic, make cable, the loss of motor and transformer increases, in addition because the use of high-speed switching devices makes the dv/dt of inverter output SPWM ripple very high, can cause electromagnetic interference problem on the one hand up to the number megahertz, on the other hand when using the long cable transmission, owing to the motor side overvoltage that the row wave reflection causes, electrical machine insulation is damaged, the cable explosion.For the harmonic current problem, can harmonic component be reduced but can not eliminate by changing the modulation waveform method.Can adopt the dv/dt rejects trap for the overvoltage that causes owing to speed-sensitive switch, but can only the cable of certain-length be suitable for, and not be suitable for the cable of random length.

Summary of the invention

Goal of the invention of the present utility model be to overcome the defective of prior art and provide a kind of simple in structure, reliability is high, inversion output filter capacious, output at inverter installs the inversion output filter additional, with the carrier frequency of inverter output is that the SPWM waveform of 1KHz～16KHz, fundamental frequency 50Hz is filtered near sinusoidal 50Hz voltage waveform, and THD (the Total Harmonic Distortion) value that reaches output voltage is lower than 5%.

Goal of the invention of the present utility model is achieved through the following technical solutions:

A kind of inversion output filter, it comprises the magnetic core coil assembly, yoke, the high pressure electrodeless electric capacity, the structure installed part, it is characterized in that described magnetic core coil assembly by three-phase with the equidistant arrangement of identical air gap, input connects the output of three phase inverter, the both sides of every phase magnetic core coil assembly are equipped with connecting plate, on, be respectively equipped with upper magnet yoke and lower yoke down with the air gap gasket insulation that increases magnetic resistance, on, each is connected in series one by clamping plate lower yoke, the three-phase high-voltage electrodeless electric capacity is connected on the lower yoke clamping plate, every phase magnetic core coil assembly draw the high pressure electrodeless electric capacity that lead connects two parallel connections respectively, output is the 50Hz three-phase sine-wave.

Described filter three-phase input end and output cable coat by cable cover(ing).

The utility model compared with prior art, because the output at inverter installs the inversion output filter additional, can be 1KHz～16KHz with the carrier frequency of inverter output, fundamental frequency is that the SPWM waveform of 50Hz is filtered near sinusoidal 50Hz voltage waveform, and the THD value of output voltage is lower than 5%, it is simple in structure, the reliability height, capacity is big, use is when long cable transmits arbitrarily, avoid causing the motor side overvoltage, electrical machine insulation damages, phenomenons such as cable explosion, be applied to novel railway air-conditioned passenger train power supply, can eliminate the high order harmonic component of passenger vehicle inverter, improve the load capacity of power supply.

Description of drawings

Fig. 1 faces structural representation for the utility model.

Fig. 2 is the left side view of Fig. 1.

Fig. 3 is the utility model perspective view.

Fig. 4 is a circuit working schematic diagram of the present utility model.

Embodiment

Below with reference to above-mentioned accompanying drawing the utility model embodiment is described in detail again.

Shown in Fig. 1～4, the inversion output filter is mainly used in novel railway air-conditioned passenger train power supply, as 25T air-conditioning passenger vehicle, 25G air-conditioning passenger vehicle etc.Be mainly used in the high order harmonic component of eliminating the passenger vehicle inverter, and improve the load capacity of power supply, its principle is to utilize the frequency characteristic of RLC filter, installs the inversion output filter additional at the output of inverter.

The inversion output filter comprises the magnetic core coil assembly 4 that connects the inverter output, between the adjacent magnetic core coil assembly with the equidistant arrangement of the air gap of identical about 10mm, the both sides of every phase magnetic core coil assembly are equipped with the connecting plate 13 of copper sheet system, purpose is to increase magnetic resistance, in case the extreme prematurity magnetisation is saturated, both sides at magnetic core coil assembly skeleton during installation are inserted connecting plate earlier, between two connecting plates, insert the magnetic core coil assembly then, and on the three-phase core coil block, down (increase magnetic resistance with the air gap gasket 14 of asbestos board system respectively, in case the extreme prematurity magnetisation is saturated), the upper magnet yoke 8 and the lower yoke 15 of insulation, on, lower yoke is respectively by the flat-plate series one, 8 liang of side connecting plates of upper magnet yoke are respectively outward " U " type clamping plate 7 and " L " type clamping plate 9, installation end daughter board 2 in " L " type clamping plate passes through nut, pad, bolt serial connection one; 15 liang of side connecting plates of lower yoke are respectively outward " L " type base plate 16 and " U " type base plate 6, and preprocessing has connecting hole on " L " type base plate and " U " type base plate, install by this connecting hole to be connected on the air-conditioned passenger train power supply box.Three phase capacitance must adopt 500V high pressure electrodeless electric capacity 5, it is connected on " U " type base plate and by outer jagged lock washer and locks, every phase magnetic core coil assembly 4 draw lead connects two parallel connections respectively by electric wire, inserted sheet 12 the high pressure electrodeless electric capacity 5 that has the electric capacity sheath, be that each high pressure electrodeless electric capacity is by shared secondary, constitute the inversion output filter, as shown in Figure 4, to motor output 380/50Hz three-phase sine-wave AC power.The cable 11 of its three-phase input end 1 and output 3 coats by cable cover(ing) 10.

Claims

1, a kind of inversion output filter, it comprises the magnetic core coil assembly, yoke, the high pressure electrodeless electric capacity, the structure installed part, it is characterized in that described magnetic core coil assembly (4) by three-phase with the equidistant arrangement of identical air gap, input (1) connects the output of three phase inverter, the both sides of every phase magnetic core coil assembly are equipped with connecting plate (13), on, be respectively equipped with upper magnet yoke (8) and lower yoke (15) down with air gap gasket (14) insulation that increases magnetic resistance, on, each is connected in series one by clamping plate lower yoke, three-phase high-voltage electrodeless electric capacity (5) is connected on the lower yoke clamping plate, every phase magnetic core coil assembly (4) draw the high pressure electrodeless electric capacity (5) that lead connects two parallel connections respectively, output (3) is the 50Hz three-phase sine-wave.

2, inversion output filter according to claim 1 is characterized in that described filter three-phase input end (1) and output (3) cable (11) coat by cable cover(ing) (10).