CN204334309U - A kind of low voltage frequency converter - Google Patents

A kind of low voltage frequency converter Download PDF

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Publication number
CN204334309U
CN204334309U CN201420838486.1U CN201420838486U CN204334309U CN 204334309 U CN204334309 U CN 204334309U CN 201420838486 U CN201420838486 U CN 201420838486U CN 204334309 U CN204334309 U CN 204334309U
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CN
China
Prior art keywords
frequency converter
contactor
series
low voltage
reactor
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Expired - Fee Related
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CN201420838486.1U
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Chinese (zh)
Inventor
赵欣
陈志强
蔡成闻
任里刚
王海燕
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赵欣
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Priority to CN201420838486.1U priority Critical patent/CN204334309U/en
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Publication of CN204334309U publication Critical patent/CN204334309U/en
Expired - Fee Related legal-status Critical Current
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Abstract

The utility model provides a kind of low voltage frequency converter, comprise frequency converter casing, control panel, input and output Wiring port, control panel is provided with LCDs, frequency converter is arranged on frequency converter box house by signal of telecommunication connection control panel, frequency converter comprises rectifying part, Converting Unit, loop protection part, series AC reactor before rectifying part, before AC reactor, current transformer is installed and voltage sensor accesses three phase network again, series direct current lateral capacitance between rectifying part and Converting Unit, Converting Unit connects motor by series loop protection part, the utility model is by series AC reactor between power supply and frequency converter input side, commutating impedance can be increased to suppress higher harmonic current, loop protection portion is installed simultaneously divide and can reduce the impact of power network fluctuation on frequency converter, ensure the continuity of frequency converter work.

Description

A kind of low voltage frequency converter
Technical field
The utility model relates to a kind of frequency converter, particularly relates to a kind of low voltage frequency converter
Background technology
Frequency converter arises at the historic moment along with the needs of frequency control, it is application converter technique and microelectric technique, being controlled the Electric Drive element of alternating current motor by the mode of the frequency and amplitude that change machine operation power supply, is the electric energy control device utilizing the on-off action of power semiconductor device power frequency supply to be transformed to another frequency.In recent years, due to speed governing and energy-conservation needs, frequency converter obtains increasingly extensive application.The energy saving motor successful of transducer drive, easy to adjust, safeguard simple.But learn from many user feedbacks; frequency converter is while enhancing productivity, reducing energy consumption; also harmonic pollution is brought to its input side, outlet side; time serious, not only himself system cannot reliability service, also can cause the deterioration of station service busbar voltage, factory becomes the consequences such as protective relaying device malfunction, motor insulation damages.Even some user is because cannot bearing the negative effect of frequency converter and by long-term for frequency converter bypass, thus causing great waste, has dampened the enthusiasm that user uses frequency converter.Therefore, the harmonic measure of frequency converter, analysis and improvement are seemed particularly important.
Low voltage frequency converter is commonly used to control motor speed, to meet needs that are energy-conservation and that control.In Electric Machine Control, although the reliability of motor itself is higher, the low voltage frequency converter being used for controlling motor speed can break down because of various reasons, once break down, will cause motor stopping, equipment is out of service, thus brings economic loss to enterprise.
Utility model content
In order to solve the problem, it is simple that the utility model provides a kind of circuit structure, can solve the technical scheme that harmonic problem can protect load simultaneously:
A kind of low voltage frequency converter; comprise frequency converter casing, control panel, input and output Wiring port; control panel is provided with LCDs; frequency converter is arranged on frequency converter box house by signal of telecommunication connection control panel; frequency converter comprises rectifying part, Converting Unit, loop protection part; series AC reactor A before rectifying part; current transformer A was installed before AC reactor A and voltage sensor accesses three phase network again; series direct current lateral capacitance between rectifying part and Converting Unit, Converting Unit connects motor by series loop protection part.
As preferably, current transformer A and voltage sensor connection data Acquisition Circuit input, data acquisition circuit output connection signal control circuit input, signal control circuit input connects drive circuit, drive circuit connect current transformer again series AC reactor B and through high pass filter access three phase network, signal control circuit comprises digital signal processor.
As preferably, loop protection part comprises contactor A, contactor B, contactor C and energization delay relay A and auxiliary relay A, contactor self-locking branch road and time delay branch circuit parallel connection.
As preferably, contactor self-locking branch road comprises the auxiliary relay A normally opened contact of series connection, energization delay relay A normally-closed contact and contactor C, auxiliary relay A normally opened contact parallel contactor A normally opened contact.
As preferably, time delay branch road comprises the auxiliary relay B normally-closed contact of series connection, contactor B normally opened contact and energization delay relay B.
The beneficial effects of the utility model are:
(1) the utility model is by series AC reactor between power supply and frequency converter input side, can increase commutating impedance to suppress higher harmonic current.
(2) the utility model divides can reduce the impact of power network fluctuation on frequency converter by installing loop protection portion, ensures the continuity of frequency converter work.
Accompanying drawing explanation
Fig. 1 is three-dimensional structure diagram of the present utility model;
Fig. 2 is anatomical connectivity schematic diagram of the present utility model;
Fig. 3 is that circuit controls main circuit of the present utility model connects sketch;
Fig. 4 is loop control circuit figure of the present utility model.
Embodiment
For making goal of the invention of the present utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, execution mode of the present utility model is described in further detail.
Low voltage frequency converter as shown in Figure 1-2, comprise frequency converter casing 1, control panel 2, input and output Wiring port 3, on control panel, 2 are provided with LCDs 21, frequency converter is arranged on frequency converter box house by signal of telecommunication connection control panel 2, frequency converter comprises rectifying part a, Converting Unit b, loop protection part c, series AC reactor A a0 before rectifying part a, current transformer A a2 was installed before AC reactor A a0 and voltage sensor a3 accesses three phase network again, current transformer A a2 and voltage sensor a3 connection data Acquisition Circuit d input, data acquisition circuit d output connection signal control circuit e input, signal control circuit e input connects drive circuit f, drive circuit f connects current transformer g series AC reactor B a1 and access three phase network through high pass filter h again, the data collected are delivered to signal control circuit e by data acquisition circuit d by current transformer A a2 and voltage sensor a3, signal control circuit e produces pulse-width signal and delivers to drive circuit f, drive circuit f drives current transformer g to produce offset current, after high pass filter h filtering switch subharmonic, electrical network is sent into by AC reactor B a1, electrolytic capacitor C2 is in parallel with the positive and negative busbar of current transformer g, contact with AC reactor B a1 again, be connected in parallel on electrical network bus, data acquisition circuit d connects current transformer B a4 and accesses electrical network, current transformer g is as main execution unit, direct current voltage pulse is added on AC reactor B a1 by PWM control strategy by each brachium pontis, thus be compensated electric current.Signal control circuit e comprises digital signal processor, and series direct current lateral capacitance C1 between rectifying part a and Converting Unit b, Converting Unit b connect motor by series loop protection part c.
As shown in Figure 3-4; loop protection part c comprises contactor A Km1, contactor B Km2, contactor C Km3 and energization delay relay A Kt1 and auxiliary relay A Ka1; in the control main circuit of loop protection part c, be connected with power supply u after the normally opened contact of load blower fan m series contactor A km 1, circuit breaker A qf1.Be connected with power supply u after the normally opened contact of power cell n series contactor B km2, circuit breaker B qf2, after circuit breaker A qf1 closes, because there is self-holding circuit in contactor A km1, the normally-closed contact of energization delay relay A kt1 does not disconnect, contactor A km1 keeps attracting state, thus series contactor C km3 normally opened contact closes, make load blower fan m energy continuous firing.Contactor self-locking branch road and time delay branch circuit parallel connection, contactor self-locking branch road comprises the auxiliary relay A ka1 normally opened contact of series connection, energization delay relay A kt1 normally-closed contact and contactor C km3, auxiliary relay A ka1 normally opened contact parallel contactor A km1 normally opened contact; When detect the signal of telecommunication or converting operation signal time auxiliary relay A ka1 normally opened contact obtain electric adhesive, when dead electricity or converting operation stop, auxiliary relay A ka1 normally opened contact dead electricity disconnects.Time delay branch road comprises the auxiliary relay B ka2 normally-closed contact of series connection, contactor B km2 normally opened contact and energization delay relay B kt2.This loop protection circuit can reduce the impact of power network fluctuation on frequency converter, ensures the continuity of frequency converter work.
Above-described embodiment is preferred embodiment of the present utility model; it is not the restriction to technical solutions of the utility model; as long as without the technical scheme that creative work can realize on the basis of above-described embodiment, all should be considered as falling within the scope of the rights protection of the utility model patent.

Claims (5)

1. a low voltage frequency converter, comprise frequency converter casing (1), control panel (2), input and output Wiring port (3), control panel (2) is provided with LCDs (21), frequency converter is arranged on frequency converter casing (1) inside by signal of telecommunication connection control panel (2), it is characterized in that: described frequency converter comprises rectifying part (a), Converting Unit (b), loop protection part (c), series AC reactor A (a0) before described rectifying part (a), before described AC reactor A (a0), installation current transformer A (a2) and voltage sensor (a3) access three phase network again, series direct current lateral capacitance (C1) between described rectifying part (a) and described Converting Unit (b), described Converting Unit (b) connects motor by described loop protection part (c) of series connection.
2. a kind of low voltage frequency converter according to claim 1, it is characterized in that: described current transformer A (a2) and described voltage sensor (a3) connection data Acquisition Circuit (d) input, described data acquisition circuit (d) output connection signal control circuit (e) input, described signal control circuit (e) input connects drive circuit (f), described drive circuit (f) connects current transformer (g) series AC reactor B (a1) and access three phase network through high pass filter (h) again, described signal control circuit (e) comprises digital signal processor.
3. a kind of low voltage frequency converter according to claim 1; it is characterized in that: described loop protection part (c) comprises contactor A (Km1), contactor B (Km2), contactor C (Km3) and energization delay relay A (Kt1) and auxiliary relay A (Ka1), contactor self-locking branch road and time delay branch circuit parallel connection.
4. a kind of low voltage frequency converter according to claim 3, it is characterized in that: described contactor self-locking branch road comprises auxiliary relay A (ka1) normally opened contact of series connection, described energization delay relay A (kt1) normally-closed contact and described contactor C (km3), described auxiliary relay A (ka1) normally opened contact described contactor A (km1) normally opened contact in parallel.
5. a kind of low voltage frequency converter according to claim 3, is characterized in that: described time delay branch road comprises auxiliary relay B (ka2) normally-closed contact of series connection, contactor B (km2) normally opened contact and energization delay relay B (kt2).
CN201420838486.1U 2014-12-18 2014-12-18 A kind of low voltage frequency converter Expired - Fee Related CN204334309U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420838486.1U CN204334309U (en) 2014-12-18 2014-12-18 A kind of low voltage frequency converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420838486.1U CN204334309U (en) 2014-12-18 2014-12-18 A kind of low voltage frequency converter

Publications (1)

Publication Number Publication Date
CN204334309U true CN204334309U (en) 2015-05-13

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CN201420838486.1U Expired - Fee Related CN204334309U (en) 2014-12-18 2014-12-18 A kind of low voltage frequency converter

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CN (1) CN204334309U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105490554A (en) * 2016-01-29 2016-04-13 济南山开电力设备有限公司 Variable frequency power supply
CN109101062A (en) * 2018-09-12 2018-12-28 江西正邦科技股份有限公司 A kind of intelligence ring control frequency converter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105490554A (en) * 2016-01-29 2016-04-13 济南山开电力设备有限公司 Variable frequency power supply
CN105490554B (en) * 2016-01-29 2018-07-24 济南山开电力设备有限公司 A kind of variable-frequency power sources
CN109101062A (en) * 2018-09-12 2018-12-28 江西正邦科技股份有限公司 A kind of intelligence ring control frequency converter

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C14 Grant of patent or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20150513

Termination date: 20151218

EXPY Termination of patent right or utility model