CN206195348U - Power supply unit is used in converter maintenance with protection - Google Patents
Power supply unit is used in converter maintenance with protection Download PDFInfo
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- CN206195348U CN206195348U CN201621087448.2U CN201621087448U CN206195348U CN 206195348 U CN206195348 U CN 206195348U CN 201621087448 U CN201621087448 U CN 201621087448U CN 206195348 U CN206195348 U CN 206195348U
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- power supply
- frequency converter
- loop
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- supply unit
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Abstract
The utility model relates to a power supply unit is used in converter maintenance with protection, including three -phase four -wire switching power supply, direct current regulating power supply return circuit, the interchange electric source circuit of debugging and control circuit, the input in direct current regulating power supply return circuit and control circuit's control bus all connect three -phase four -wire switching power supply's AC220V binding post, three -phase four -wire switching power supply's AC380V binding post is connected to the input that exchanges the electric source circuit of debugging, the output in direct current regulating power supply return circuit is the dc supply end of converter, the output that exchanges the electric source circuit of debugging is the ac energisation end of converter. This power supply unit's simple structure, area is little, uses in a flexible way reliably, can provide continuously adjustable direct current debugging voltage on the one hand, and on the other hand can also provide the three -phase AC voltage who takes short -circuit protection, and application scope is wide.
Description
Technical field
The utility model be related to frequency converter debug maintenance conditions technical field, concretely relate to it is a kind of with protection
Frequency converter maintenance supply unit.
Background technology
Frequency converter is widely used in the speed governing of blower-pump load, such as automation, printing, elevator, lathe, streamline
The control of the various plant equipment such as the dynamic control of speed, transmission, lifting, extruding and lathe, it can improve technological level and product
The advantages of quality, the impact of reduction equipment and noise, extension device service life, function of raising whole equipment, therefore in industry
It is widely used with civil area.Due to existing low-voltage electronic device in frequency converter, also there is high-voltage power component, signal was both
There is analog signal also to have between data signal, difference in functionality circuit and there is interrelated and influence, the scene dimension of high-tension electricity device
Repair with very big risk and difficulty, therefore be generally at present offline for maintenance.It is required each during frequency converter offline for maintenance in order to meet
Kind of power supply and square-wave signal, the voltage of existing frequency converter maintenance power supply are generally DC550V, and current continuous-current plant
All it is standardized product, every output voltage is generally DC0-120V, with 5 direct currents so when frequency converter offline for maintenance is carried out
Power sources in series.This not only causes the continuous-current plant high cost for frequency converter offline for maintenance, and also takes up larger sky
Between, using also especially inconvenient, additionally, it is this by the maintenance supply unit that is composed in series by standard DC power supply device also without
Method realizes having the AC power of protection to export.Therefore, exigence development provides a kind of new and with the frequency converter of protection
Offline for maintenance supply unit.
The content of the invention
The purpose of this utility model is high cost in order to overcome existing continuous-current plant and takes up an area excessive asking
Topic, and a kind of frequency converter maintenance supply unit with protection is provided, the device overall construction design is ingenious, easy to operate,
Floor space it is small and on the one hand can provide continuously adjustabe direct current debugging voltage on the other hand can also provide with short-circuit protection three
Cross streams voltage.
To achieve these goals, the technical solution adopted in the utility model is that a kind of frequency converter with protection is repaired
With supply unit, including three-phase four-wire switching power supply, DC voltage regulator power supply loop, exchange debugging electric power loop and control loop,
The input in the DC voltage regulator power supply loop and the control bus of control loop are all connected with three-phase four-wire switching power supply
AC220V binding posts, the input of the exchange debugging electric power loop connects the AC380V terminals of three-phase four-wire switching power supply
Son；The output end in the DC voltage regulator power supply loop is the DC power supply terminal of frequency converter, and the defeated of electric power loop is debugged in the exchange
It is the Alternating Current Power Supply end of frequency converter to go out end.
Used as a kind of improvement of the present utility model, the DC voltage regulator power supply loop includes contact voltage regulator, boosting transformation
Device, rectifier bridge, current-limiting resistance, RC filter circuits and the first guard lamp, the primary side of the contact voltage regulator are drawn and are adjusted as direct current
The input of piezoelectricity resource loop, the secondary of the contact voltage regulator is connected with the input wires terminal of the step-up transformer,
The output wiring terminal of step-up transformer connects the input of rectifier bridge, and the output end of rectifier bridge connects one end of current-limiting resistance,
The other end connection RC filter circuits of current-limiting resistance, one end of the RC filter circuits is drawn as the DC power supply terminal of frequency converter
A binding post, the other end connect the first guard lamp after draw again as another wiring of the DC power supply terminal of frequency converter
Terminal.
Used as a kind of improvement of the present utility model, the exchange debugging electric power loop includes three the second guard lamps, each
One end of second guard lamp is connected on the AC380V binding posts of three-phase four-wire switching power supply, and the other end is drawn as frequency converter
Alternating Current Power Supply end binding post.
As it is of the present utility model it is a kind of improve, the control loop include multichannel AC selecting switch, the first breaker,
Second breaker, contactor, very first time relay and second time relay, first breaker and the second breaker
Binding post of the current coil with multichannel AC selecting switch is connected in series, and the main contacts of first breaker is connected to three
Between the AC220V binding posts of phase four-wire switching power supply and the input in DC voltage regulator power supply loop, second breaker
Main contacts is connected between the AC380V binding posts of three-phase four-wire switching power supply and the second guard lamp；The master of the contactor touches
Point is connected in parallel with the first guard lamp and the second guard lamp respectively, the delayed contact and current-limiting resistance of the very first time relay
It is connected in parallel, the auxiliary contact of the contactor are connected in series with the delayed contact of second time relay.
Used as a kind of improvement of the present utility model, the very first time relay and second time relay are using energization
Time-delay relay.
As a kind of improvement of the present utility model, the work(of the power and frequency converter of first guard lamp and the second guard lamp
Rate matches, so that the phenomenon that is short-circuited again inside frequency converter can be prevented in the upper moment for electrically connecting.
Used as a kind of improvement of the present utility model, the RC filter circuits include the first electric capacity, the first divider resistance, second
Electric capacity and the second divider resistance, first electric capacity and the connection of the second capacitances in series, first divider resistance and the second partial pressure
Resistant series are connected, and first electric capacity and the first divider resistance are connected in parallel, and the second electric capacity and the second divider resistance are in parallel even
Connect.
Used as a kind of improvement of the present utility model, the DC voltage regulator power supply loop also includes DC ammeter and direct current
Pressure table, the DC ammeter be connected in series in the DC power supply terminal of RC filter circuits and frequency converter a binding post it
Between, the D.C. voltmeter is connected in parallel between two binding posts of the DC power supply terminal of frequency converter.
Used as a kind of improvement of the present utility model, the exchange debugging electric power loop also includes three alternating current ammeters, often
Individual alternating current ammeter is connected in series between the AC380V binding posts of three-phase four-wire switching power supply and each second guard lamp.
Relative to prior art, overall construction design of the present utility model is ingenious, dismounting assembling convenient maintenance and replacement, cost
Relatively low, overall structure is simple, and floor space is small, can effectively improve the reliability and security of frequency converter maintenance；In this power supply dress
DC voltage regulator power supply loop, exchange debugging electric power loop and control loop are centered, has been handed over by the multichannel in control loop
Flow selecting switch to realize switching over DC voltage regulator power supply loop with debugging electric power loop is exchanged, due in direct current voltage reulation electricity
Resource loop is provided with contact voltage regulator, the DC voltage continuously adjustabe that the loop is exported, with the full-featured, scope of application
Extensively, using flexibility and reliability, easy-to-operate the features such as；It is equipped with debugging electric power loop is exchanged in DC voltage regulator power supply loop
Guard lamp plays shunting voltage-limiting protection effect to frequency converter, while also allowing for detecting and judging whether frequency converter inside major loop is deposited
In short circuit phenomenon, so as to be conducive to improving the accuracy and maintenance efficiency of frequency converter maintenance；It is provided with logical in control loop in addition
Electric time-delay relay, can by DC voltage regulator power supply loop with exchange debugging electric power loop in current-limiting resistance and guard lamp time delay it is short
Connect, it is got rid of from loop, so as to reduce the energy loss in DC voltage regulator power supply loop and frequency converter will can be debugged
Influence minimize.
Brief description of the drawings
Fig. 1 is the structured flowchart of supply unit of the present utility model.
Fig. 2 is the electrical structure diagram of the utility model preferred embodiment.
Specific embodiment
In order to deepen, to understanding and cognition of the present utility model, the utility model to be further described below in conjunction with the accompanying drawings
And introduction.
Fig. 1 and 2 give it is a kind of with protection frequency converter maintenance supply unit, including three-phase four-wire switching power supply,
DC voltage regulator power supply loop, exchange debugging electric power loop and control loop, the three-phase four-wire switching power supply use three-phase and four-line
Power supply system, including live wire U, V, W and zero line N, wherein voltage between two any live wires is 380V, any one live wire with
Voltage between zero line is 220V.Three live wires U, V, W are drawn as AC380V wiring in this three-phase four-wire switching power supply
Terminal, live wire U and zero line N is drawn as AC220V binding posts.The input in the DC voltage regulator power supply loop and control
The control bus in loop processed are all connected with the AC220V binding posts of three-phase four-wire switching power supply, the exchange debugging electric power loop
Input connects the AC380V binding posts of three-phase four-wire switching power supply.The output end in the DC voltage regulator power supply loop is frequency conversion
The DC power supply terminal of device, the output end of the exchange debugging electric power loop is the Alternating Current Power Supply end of frequency converter.And the direct current
Voltage controller power source loop prevents frequency converter from the guard lamp that damages again occurring with exchanging to be equipped with debugging electric power loop.
In the present embodiment, the DC voltage regulator power supply loop includes contact voltage regulator TY, step-up transformer TYQ, rectification
Bridge ZLQ, current-limiting resistance R1, RC filter circuit and the first guard lamp X1 and X2（Hereinafter abbreviated as X1-2）, the contact voltage regulator
The primary side of TY is drawn as the input in DC voltage regulator power supply loop, the secondary of the contact voltage regulator TY and the boosting transformation
The input wires terminal of device TYQ is connected, the input of the output wiring terminal connection rectifier bridge ZLQ of step-up transformer TYQ, whole
One end of the output end connection current-limiting resistance R1 of stream bridge ZLQ, the other end connection RC filter circuits of current-limiting resistance R1, the RC filters
Draw a binding post as the DC power supply terminal of frequency converter, the first guard lamp X1-2 of other end series connection in one end of wave circuit
Draw again afterwards as another binding post of the DC power supply terminal of frequency converter.DC voltage regulator power supply loop passes through contact voltage regulator
The DC voltage that TY is exported to it carries out continuously adjustabe, so as to adapt to the VDCT volts ,direct-current ,test needs of different frequency converters, rectification
The AC rectification that bridge exports step-up transformer TYQ is direct current, and by current-limiting resistance R1's and the first guard lamp X1-2
Exported after pressure limiting and the filter action of RC filter circuits.
Wherein, the primary side input voltage of the contact voltage regulator TY be AC220V, the output voltage continuously adjustabe of secondary, its
Range of regulation be AC 0 to 250V, the transformation of step-up transformer TYQ boosts to 380V for 220V transformations.The RC filter circuits bag
Include the first electric capacity C1, the first divider resistance R2, the second electric capacity C2 and the second divider resistance R3, the first electric capacity C1 and the second electricity
Hold C2 to be connected in series, the first divider resistance R2 and the second divider resistance R3 are connected in series, the first electric capacity C1 and first
Divider resistance R2 is connected in parallel, and the second electric capacity C2 and the second divider resistance R3 are connected in parallel.The electricity of the first electric capacity C1 and second
Hold C2 and on the one hand play a part of charge balancing, on the other hand constituted with the first divider resistance R2 and the second divider resistance R3 respectively
Two RC filter circuits, carry out harmonic component and filter effect to the direct current that rectified bridge ZLQ is exported.First guard lamp
The quantity of X1-2 is two, and power and the power of frequency converter of the first guard lamp X1-2 matches, so as to can be electrically connected upper
Moment prevents the phenomenon that is short-circuited again inside main circuit of frequency converter.
In addition, DC ammeter A1 and D.C. voltmeter V1 is additionally provided with the DC voltage regulator power supply loop, it is described straight
Stream ammeter A1 is connected in series between a binding post of the DC power supply terminal of RC filter circuits and frequency converter, the direct current
Voltmeter V1 is connected in parallel between two binding posts of the DC power supply terminal of frequency converter.DC ammeter A1 and DC voltage
Table V 1 is respectively used to monitor the electric current and voltage on DC voltage regulator power supply loop, so as to as the reference of frequency converter maintenance operation
Amount.
In the present embodiment, the exchange debugging electric power loop includes three second guard lamps X3, X4 and X5（Following shorthand
It is X3-5）, one end of each the second guard lamp X3-5 is connected on the AC380V binding posts of three-phase four-wire switching power supply, another
Draw the binding post as the Alternating Current Power Supply end of frequency converter in end.The power of the second guard lamp X3-5 and the power phase of frequency converter
Match somebody with somebody, so that the phenomenon that is short-circuited again inside main circuit of frequency converter can be prevented in the upper moment for electrically connecting.And in the exchange
Three alternating current ammeters A2, A3 and A4 are provided with debugging electric power loop（Hereinafter abbreviated as A2-4）, each alternating current ammeter A2-4
It is connected in series between the AC380V binding posts of three-phase four-wire switching power supply and each second guard lamp X3-5.Three exchanges
Whether ammeter A2-4 is used to debug the current value on each road, and equal for judging tested frequency converter three-phase current operationally
Weighing apparatus.
In the present embodiment, the control loop includes multichannel AC selecting switch XZ, the first breaker JS, the second open circuit
Device ZS, contactor ZC, very first time relay YS and the second time relay DJ.The first breaker JS and the second breaker
Binding post of the current coil of ZS with multichannel AC selecting switch XZ is connected in series, and the first breaker JS and second breaks
Delayed contact of the closing coil of road device ZS with the second time relay DJ is connected in series, and the master of the first breaker JS touches
Point is connected between the AC220V binding posts of three-phase four-wire switching power supply and the input in DC voltage regulator power supply loop, and described the
The main contacts of two breaker ZS is connected between the AC380V binding posts of three-phase four-wire switching power supply and the second guard lamp X3-5.
The main contacts of the contactor ZC is connected in parallel with the first guard lamp X1-2 and the second guard lamp X3-5 respectively, the very first time
The delayed contact of relay YS is connected in parallel with current-limiting resistance R1, the auxiliary contact and second time relay of the contactor ZC
The delayed contact of DJ is connected in series.The first breaker JS and the second breaker ZS are led to by multichannel AC selecting switch XZ
It is disconnected to switch over selection, so as to reach the switching purpose between realizing DC voltage regulator power supply loop and exchanging debugging electric power loop.
The auxiliary contact of the contactor ZC can realize common folding with its main contacts, by the time delay for controlling the second time relay DJ
The folding of contact carrys out the folding of the main contacts of indirect control contactor ZC, so as to the first guard lamp X1-2 and the second guard lamp
X3-5 realizes the operation of time delay short circuit, and then by the first guard lamp X1-2 and the second guard lamp X3-5 from DC voltage regulator power supply loop
With exchange debugging electric power loop in get rid of with realize safety debugging purpose.By the time delay for controlling very first time relay YS
The folding of contact carries out current-limiting resistance R1 time delay short circuit and it is got rid of from DC voltage regulator power supply loop, so as to reduce direct current
Energy loss in voltage controller power source loop.
Preferably, the very first time relay YS and the second time relay DJ use energization delay relay, from
And postpone a period of time connection after electricity can be realized, so that current-limiting resistance R1 and guard lamp（Including the first guard lamp X1-2
With the second guard lamp X3-5）The moment of electricity plays one to frequency converter on DC voltage regulator power supply loop or exchange debugging electric power loop
Fixed protective effect, and after being realized to the defencive function of frequency converter when current-limiting resistance and guard lamp, then by current-limiting resistance and guarantor
Shield lamp carries out short circuit treatment, so that the influence to frequency converter debugging is on the one hand reduced, on the other hand also reducing two loops
Electric energy loss and avoid heating.
Frequency converter when in use, is first accessed DC power supply terminal or Alternating Current Power Supply end, then by multichannel by this supply unit
The XZ selections of exchange selecting switch connect DC voltage regulator power supply loop or exchange debugging electric power loop to carry out alternating current-direct current debugging operations.
Current-limiting resistance R1 is put into connecting when DC voltage regulator power supply loop realizes that device starts, can be prevented because of the electricity of the first electric capacity C1 and second
The charging current for holding C2 is excessive and cause two electric capacity to fill quick-fried, after being lowered when the electric current in RC filter circuits, by first
Time relay YS carries out short circuit to current-limiting resistance.When the first guard lamp is lighted and can reach high-high brightness, frequency converter is illustrated
There is short circuit phenomenon in major loop, while the first guard lamp serves partial pressure current-limiting protection effect to frequency converter, prevent frequency converter again
Secondary damage, now needs to break frequency converter from DC voltage regulator power supply loop to carry out tearing machine check open.And when the first guard lamp
When non-lit up, illustrate that main circuit of frequency converter, now can be by the second time relay DJ to contactor in the absence of short circuit phenomenon
The auxiliary contact of ZC carry out timing closing, by the first guard lamp short circuit, will be become so as to the main contacts for driving contactor ZC is closed
Frequency device puts into normal commissioning test.
And when exchange debugging electric power loop is connected, when the second guard lamp X3-5 is lighted and can be reached high-high brightness,
Illustrate that main circuit of frequency converter has short circuit phenomenon, while the second guard lamp X3-5 serves partial pressure current-limiting protection work to frequency converter
With, prevent frequency converter from damaging again, now need to break to carry out tearing machine check open from exchange debugging electric power loop by frequency converter.
And when the second guard lamp X3-5 is non-lit up, illustrate main circuit of frequency converter in the absence of short circuit phenomenon, now can by second when
Between relay DJ timing closing is carried out to the auxiliary contact of contactor ZC so as to the main contacts for driving contactor ZC is closed by the
Two guard lamp X3-5 short circuits, normal commissioning test is put into by frequency converter.
As can be seen here, this supply unit realizes that direct current is adjusted by the selection of the multichannel AC selecting switch XZ in control loop
Piezoelectricity resource loop or exchange debugging electric power loop switching, by the illuminating state of the first guard lamp or the second guard lamp X3-5 come
Frequency converter inside major loop is judged with the presence or absence of failure, and by time delay short circuit current-limiting resistance, the first guard lamp and the second protection
Lamp X3-5 come realize safety debugging purpose, it is simple to operate safe and reliable, it is cheap.
It should be noted that above-described embodiment, not for limiting protection domain of the present utility model, in above-mentioned technical side
Done equivalents or replacement each fall within the utility model scope of the claimed protection on the basis of case.Will in right
In asking, word "comprising" does not exclude the presence of element not listed in the claims.Word first, second and the third use
Any order is not indicated that, these words title can be construed to.
Technological means disclosed in the utility model scheme is not limited only to the technological means disclosed in above-mentioned implementation method, also
Including being combined constituted technical scheme by above technical characteristic.It should be pointed out that for the ordinary skill of the art
For personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improve and moisten
Decorations are also considered as protection domain of the present utility model.
Claims (9)
1. a kind of with the frequency converter maintenance supply unit protected, it is characterised in that：Including three-phase four-wire switching power supply, direct current
Voltage controller power source loop, exchange debugging electric power loop and control loop, the input in the DC voltage regulator power supply loop and control
The control bus in loop are all connected with the AC220V binding posts of three-phase four-wire switching power supply, and the defeated of electric power loop is debugged in the exchange
Enter the AC380V binding posts of end connection three-phase four-wire switching power supply；The output end in the DC voltage regulator power supply loop is frequency converter
DC power supply terminal, the output end of exchange debugging electric power loop is the Alternating Current Power Supply end of frequency converter.
2. it is as claimed in claim 1 a kind of with the frequency converter maintenance supply unit protected, it is characterised in that the direct current
Voltage controller power source loop includes contact voltage regulator, step-up transformer, rectifier bridge, current-limiting resistance, RC filter circuits and the first guard lamp,
The primary side of the contact voltage regulator is drawn as the input in DC voltage regulator power supply loop, the secondary of the contact voltage regulator and institute
The input wires terminal for stating step-up transformer is connected, and the output wiring terminal of step-up transformer connects the input of rectifier bridge,
The output end of rectifier bridge connects one end of current-limiting resistance, the other end connection RC filter circuits of current-limiting resistance, the RC filtered electricals
A binding post as the DC power supply terminal of frequency converter is drawn in the one end on road, is drawn again after the other end the first guard lamp of series connection
As another binding post of the DC power supply terminal of frequency converter.
3. it is as claimed in claim 2 a kind of with the frequency converter maintenance supply unit protected, it is characterised in that the exchange
Debugging electric power loop includes three the second guard lamps, and one end of each the second guard lamp is connected on three-phase four-wire switching power supply
On AC380V binding posts, the other end draws the binding post as the Alternating Current Power Supply end of frequency converter.
4. it is as claimed in claim 3 a kind of with the frequency converter maintenance supply unit protected, it is characterised in that the control
When loop is including multichannel AC selecting switch, the first breaker, the second breaker, contactor, very first time relay and second
Between relay, the coil of first breaker and the second breaker connects company with the binding post of multichannel AC selecting switch
Connect, the main contacts of first breaker is connected to the AC220V binding posts and DC voltage regulator power supply of three-phase four-wire switching power supply
Between the input in loop, the main contacts of second breaker is connected to the AC380V binding posts of three-phase four-wire switching power supply
Between the second guard lamp；The main contacts of the contactor is connected in parallel with the first guard lamp and the second guard lamp respectively, described
The delayed contact of very first time relay is connected in parallel with current-limiting resistance, the auxiliary contact of the contactor and the second time relay
The delayed contact of device is connected in series.
5. it is as claimed in claim 4 a kind of with the frequency converter maintenance supply unit protected, it is characterised in that described first
The time relay and second time relay use energization delay relay.
6. it is as claimed in claim 3 a kind of with the frequency converter maintenance supply unit protected, it is characterised in that described first
The power of guard lamp and the second guard lamp matches with the power of frequency converter.
7. it is as claimed in claim 2 a kind of with the frequency converter maintenance supply unit protected, it is characterised in that the RC filters
Wave circuit includes the first electric capacity, the first divider resistance, the second electric capacity and the second divider resistance, first electric capacity and the second electric capacity
It is connected in series, first divider resistance and the second divider resistance are connected in series, first electric capacity and the first divider resistance are simultaneously
Connection connection, the second electric capacity and the second divider resistance are connected in parallel.
8. it is as claimed in claim 2 a kind of with the frequency converter maintenance supply unit protected, it is characterised in that the direct current
Voltage controller power source loop also include DC ammeter and D.C. voltmeter, the DC ammeter be connected in series in RC filter circuits with
Between one binding post of the DC power supply terminal of frequency converter, the D.C. voltmeter is connected in the direct current supply of frequency converter in parallel
Between two binding posts at end.
9. it is as claimed in claim 3 a kind of with the frequency converter maintenance supply unit protected, it is characterised in that the exchange
Debugging electric power loop also includes three alternating current ammeters, and each alternating current ammeter is connected in series in three-phase four-wire switching power supply
Between AC380V binding posts and each second guard lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621087448.2U CN206195348U (en) | 2016-09-28 | 2016-09-28 | Power supply unit is used in converter maintenance with protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621087448.2U CN206195348U (en) | 2016-09-28 | 2016-09-28 | Power supply unit is used in converter maintenance with protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206195348U true CN206195348U (en) | 2017-05-24 |
Family
ID=58731271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621087448.2U Withdrawn - After Issue CN206195348U (en) | 2016-09-28 | 2016-09-28 | Power supply unit is used in converter maintenance with protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206195348U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300346A (en) * | 2016-09-28 | 2017-01-04 | 江苏恒创软件有限公司 | A kind of with protected converter maintenance supply unit |
-
2016
- 2016-09-28 CN CN201621087448.2U patent/CN206195348U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300346A (en) * | 2016-09-28 | 2017-01-04 | 江苏恒创软件有限公司 | A kind of with protected converter maintenance supply unit |
| CN106300346B (en) * | 2016-09-28 | 2019-02-26 | 江苏恒创软件有限公司 | A kind of frequency converter maintenance power supply device with protection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170524 Effective date of abandoning: 20190226 |
|
| AV01 | Patent right actively abandoned |