CN205901604U

CN205901604U - High -efficient electromagnetic compatibility's converter

Info

Publication number: CN205901604U
Application number: CN201620853744.2U
Authority: CN
Inventors: 王展英
Original assignee: Suzhou Bangtuo Electromechanical Science & Technology Co Ltd
Current assignee: Suzhou Bangtuo Electromechanical Science & Technology Co Ltd
Priority date: 2016-08-09
Filing date: 2016-08-09
Publication date: 2017-01-18
Anticipated expiration: 2026-08-09

Abstract

The utility model discloses a high -efficient electromagnetic compatibility's converter, including rectification filter circuit and the inverter circuit who connects gradually, be connected with the common mode choke coil in rectification filter outlet's the major loop, common mode choke coil output connection inverter circuit, inverter circuit is the bridge type inverter circuit that a plurality of power tubes are constituteed, and it has RC filter module wherein to connect in parallel on every power tube, inverter circuit is by the pulse control ware connection control of output multichannel pulse. The converter designs into the PCB board, power cord on the PCB board and ground wire walk the adjacent overall arrangement of line. The utility model discloses an electromagnetic compatibility design is carried out to the mode that hardware principles of design and PCB design combined together, and the inductance filtering and the absorptive capacitor filter of resistance -capacitance of common mode choke coil combine together, and principles of design and PCB design combine together, reduce the influence that the electron disturbed, makes the wave form be close sinusoidal wave more, the security and the reliability of the operation of assurance system.

Description

A kind of compatible converter of high-efficiency electromagnetic

Technical field

This utility model is related to converter, particularly to a kind of compatible converter of high-efficiency electromagnetic.

Background technology

Current converter technique is in an increasingly wide range of applications in productive life, in motor speed regulation system, frequency control Become main flow, progressively instead of traditional variable voltage control control system.Frequency conversion speed-adjusting system, is become using " AC-DC-AC " mostly Change mode, controlled the switching of the on off state of power tube by single-chip microcomputer output control pulse, obtain the frequency of needs.Mode of speed regulation Also there are many kinds, modes of speed regulation as various in vector controlled, Direct Torque Control, pulsewidth modulation etc..Pulsewidth in Small-power Inverter Modulation pwm technology, because hardware is simple, it is convenient to realize, can direct opened loop control, have been obtained for being widely applied.Pulsewidth is adjusted What mode processed exported is the impulse waveform of certain frequency and amplitude, rather than sinusoidal wave form, so existing a large amount of in this pulse Higher hamonic wave.The presence of higher hamonic wave will have a strong impact on the performance of system, be also a kind of serious pollution to electrical network.Additionally, Due to the change of the logic state in the switching and digital integrated electronic circuit of the on off state of power tube, cause the fast of electric current and voltage Speed change, forms ripple, produces electromagnetic radiation, deals with improperly the work of severe jamming electronic devices and components.Electromagnetic interference is to work as One of difficult problem that modern electronic product faces.

For electromagnetic interference, this utility model is by the way of integrated treatment, is difficult to allow electricity in single interference protection measure In the case that magnetic compatibility reaches promising result, various ways integrated use has become necessary selection.The frequency conversion that this technology is applied Device frequency is 200-700hz, due to using the pulse modulation technology pwm of AC-DC-AC, the cutting of the on off state of power tube Changing frequency is 2.4khz, and power is 250-3000w, and the maximum speed of motor is up to 40000 revs/min.By multiple filtering techniques, This converter is applied, is realized the safe and reliable operation of converter.With single-chip microcomputer as control section core devices, Ir2130 exports six pulsed drive field effect transistor, realizes frequency transformation.There is overcurrent protection, the function such as short-circuit protection.

Utility model content

This utility model purpose is: a kind of compatible converter of high-efficiency electromagnetic, and the electromagnetic wave using comprehensive converter is repaiied Positive structure reduces the impact of electronic interferences, makes waveform be more nearly sine wave it is ensured that the safety and reliability of system operation.

The technical solution of the utility model is:

A kind of compatible converter of high-efficiency electromagnetic, including the current rectifying and wave filtering circuit being sequentially connected and inverter circuit, its feature It is, be connected with common mode choke in the major loop of described current rectifying and wave filtering circuit output, common mode choke output connects inversion electricity Road, described inverter circuit is the bridge inverter main circuit of some power tube compositions, is wherein parallel with rc filtering mould on each power tube Block；Described inverter circuit connects control by the impulse controller of output multi-channel pulse.

Preferably, described Design of Inverter becomes pcb plate, the cabling adjacent layouts of the power and ground on described pcb plate.

Compared with prior art, the utility model has the advantages that:

This utility model carries out EMC Design, common mode by way of hardware principle design and pcb design combine The capacitor filtering of the inductor filter of choke coil and resistance-capacitance absorption combines, and principle design and pcb design combine, and reduce electronics and do The impact disturbed, makes waveform be more nearly sine wave it is ensured that the safety and reliability of system operation.

Brief description

Below in conjunction with the accompanying drawings and embodiment is further described to this utility model:

Fig. 1 is the circuit theory diagrams increasing common mode choke in converter current rectifying and wave filtering circuit described in the utility model；

Fig. 2 be converter described in the utility model inverter circuit in increase rc filtration module circuit theory diagrams；

Fig. 3 is the cabling schematic diagram of pcb plate described in the utility model.

Specific embodiment

A kind of compatible converter of high-efficiency electromagnetic disclosed in this utility model, as shown in figure 1, defeated in current rectifying and wave filtering circuit Increase common mode choke l100 in the major loop going out, major loop plays inductive, reduce the effect of di/dt, reduce and produce Electromagnetic wave.As Fig. 2, power tube adds rc filtration module, absorb higher hamonic wave, reduce the change speed of power tube both end voltage Rate dv/dt, makes voltage smooth change, close to sine wave.

Inverter circuit as shown in Figure 2 is adjusted by this utility model by the pulsewidth that 12 pulses are changed in the pulsewidth modulation of 6 pulses System, so closer to sine wave.The waveform phase sequence of six kinds of pulses punching is: ah → cl, ah → bl, ch → bl, ch → al, bh → al, bh → cl, ah represent half-bridge conducting such as q1 in Fig. 2 in a phase, and cl represents half-bridge conducting such as q6 in Fig. 2 under c phase, by that analogy.Using 6 The pulse modulation technology of pulse, a pulse step size is 60 degree.After being changed to the pulsewidth modulation of 12 pulses, pulse train is: ah → Cl, ah → blcl, ah → bl, ahch → bl, ch → bl, ch → albl, ch → al, bhch → al, bh → al, bh → alcl, Bh → cl, ahbh → cl.The step-length of pulse, by original 60 degree, is changed to 30 degree, reduces vibration noise, the waveform of line voltage is more Close to sinusoidal wave form.Itself reduces the generation of higher hamonic wave from waveform, reduce electromagnetic interference.

This utility model, when pcb designs, power and ground adjacent layouts cabling makes power and ground produce Can cancel out each other in magnetic field, reduce electromagnetic interference.Because the direction of power supply and ground line current is always contrary, equal in magnitude, so Can cancel out each other in the magnetic field producing.As shown in figure 3, power supply and ground wire are adjacently positioned, allow the loop that power supply and ground wire are formed Little, it is the strength that electromagnetic field produces in the electric current formed electric current loop of power and ground, outside electric current loop, because on ground wire Cancel out each other in the magnetic field that electric current on electric current and power line produces, then electromagnetic interference is greatly lowered.Components and parts try not to arrange In the loop that power supply and ground wire are formed, to avoid interference.

The method realizing filtering in terms of electromagnetic compatibility is a lot, such as low pass filter, and on pcb, planning grid reduces electromagnetism Radiation, design 0v plane of reference etc..The difference that the electromagnetic wave modification method of converter of the present utility model is main is mainly The generation of interference source is reduced on source.For example: adopt common mode choke, lower di/dt, rc wave filter reduces dv/dt, lower Electric current and the rate of change of voltage, reduce the generation of electromagnetic interference.Pcb using ground wire and the adjacent, parallel design of power line is In curent change, the electromagnetic radiation energy that equal-sized two curent changes in opposite direction produce is cancelled out each other, power supply and ground The loop of line composition is minimum, reduces electromagnetic interference.12 pulses are changed in the pulsewidth modulation of 6 pulses, allows waveform more adjunction itself Nearly sine wave, reduces higher hamonic wave.By the sine wave amendment design of this electromagnetic compatibility technology, substantially improve the electricity of converter Magnetic compatibility, improves the performance of product, increased reliability.

Above-described embodiment is only that technology design of the present utility model and feature are described, its object is to allow and is familiar with technique People will appreciate that content of the present utility model and implement according to this, protection domain of the present utility model can not be limited with this.All The modification done according to the spirit of this utility model main technical schemes, all should cover in protection domain of the present utility model Within.

Claims

1. the compatible converter of a kind of high-efficiency electromagnetic, including the current rectifying and wave filtering circuit being sequentially connected and inverter circuit, its feature exists In, it is connected with common mode choke in the major loop of described current rectifying and wave filtering circuit output, common mode choke output connects inverter circuit, Described inverter circuit is the bridge inverter main circuit of some power tube compositions, is wherein parallel with rc filtration module on each power tube； Described inverter circuit connects control by the impulse controller of output multi-channel pulse.

2. the compatible converter of high-efficiency electromagnetic according to claim 1 it is characterised in that: described Design of Inverter becomes pcb Plate, the cabling adjacent layouts of the power and ground on described pcb plate.