CN106301000B - Inverter and its control unit - Google Patents
Inverter and its control unit Download PDFInfo
- Publication number
- CN106301000B CN106301000B CN201610656910.4A CN201610656910A CN106301000B CN 106301000 B CN106301000 B CN 106301000B CN 201610656910 A CN201610656910 A CN 201610656910A CN 106301000 B CN106301000 B CN 106301000B
- Authority
- CN
- China
- Prior art keywords
- inverter
- bus
- power supply
- control module
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
Abstract
The present invention provides a kind of inverter and its control unit.The control unit of the inverter, including：Control module, rectification side voltage/current sensor, the first power supply and second source；The rectification side voltage/current sensor is used to detect the voltage or electric current of the rectifying part of inverter；First power supply, for powering when the inverter works normally for the control module；The second source, for powering in the inverter power down for the control module；And voltage or electric current that the control module is detected according to the rectification side voltage/current sensor, judge the inverter power down, its power supply is switched to second source from first power supply by the control module.When inverter works normally, discharge circuit is not accessed, and improves system reliability.And further, by increasing discharge indicating lamp, indicator light is lighted in discharge circuit work, extinguishes indicator light after the completion of electric discharge, so that discharge process is more intuitive.
Description
Technical field
The present invention relates to electron electric power technical field more particularly to a kind of inverter and its control units.
Background technique
The main topology of high-power frequency conversion centrifugal chiller inverter generallys use " cross-straight-intersection " structure.Alternating current input,
DC potential is established by rectifying part, biggish capacitor is accessed on intermediate link, that is, DC bus for energy storage, main body
Structure is as shown in Figure 1.
Wherein, inverter establishes higher voltage at work, on DC bus, the direct current when inverter is shut down
Residual voltage on bus need to discharge by discharge circuit, and security risk otherwise will be present.As shown in Figure 1, its scheme for using
It is to be directly accessed bleeder resistance at DC bus both ends to realize this function.However, then make whether under which kind of state in this way,
As long as there is voltage on DC bus, energy will be consumed on bleeder resistance, to cause energy dissipation, and the bleeder resistance
Fever can be such that inverter inside temperature increases.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of inverter and its control unit, to reduce energy consumption.
According to the first aspect of the invention, a kind of control unit of inverter is provided, including：
Control module, rectification side voltage/current sensor, the first power supply and second source；
The rectification side voltage/current sensor is used to detect the voltage or electric current of the rectifying part of inverter；
First power supply, for powering when the inverter works normally for the control module；
The second source, for powering in the inverter power down for the control module；And
The voltage or electric current that the control module is detected according to the rectification side voltage/current sensor, described in judgement
Its power supply is switched to second source from first power supply by inverter power down, the control module.
Further, first power supply is the Switching Power Supply being connected between DC bus；And/or the second source
For the UPS being connect with alternating current source.
Further, the control module includes controller and contactor；
When the controller is by the collected voltage of rectification side voltage/current sensor or current signal, judge to change
Flowing device power down, then the controller controls the contactor, so that the normally-closed contact of contactor disconnects, and normally opened contact is closed,
To which the power supply is switched to second source from first power supply.
Further, in the inverter power down, the control module sends pulse signal, drives the DC/ of inverter
AC circuit makes a bridge arm upper tube and the conducting of another bridge arm down tube in any two bridge arm of the DC/AC circuit, thus
So that machine winding is connected in the discharge circuit of inverter, discharge for the residual charge to DC bus.
It further, is high level signal or pwm signal for driving the pulse signal of the DC/AC circuit.
Further, described control unit further includes DC bus-bar voltage sensor, for detecting between two DC bus
Voltage；And
The voltage that the control module is detected according to DC bus-bar voltage sensor, control is by its power supply from second
Power supply is switched to the first power supply.
Further, described control unit further includes DC bus-bar voltage sensor, for detecting between two DC bus
Voltage；And
The voltage that the control module is detected according to DC bus-bar voltage sensor, control is by its power supply from second
Power supply is switched to the first power supply.
Further, when the voltage that control module is detected by the DC bus-bar voltage sensor, judge DC bus
At the end of residual charge discharges, control module output control signal makes the coil power down of the contactor, then contactor is normally opened
Contact disconnects, normally-closed contact closure, so that the power supply of control module is switched to the first power supply by second source.
Further, the control module further includes contactor coil indicator light, for being lighted when discharge circuit discharges,
To indicate discharge process.
According to the second aspect of the invention, a kind of inverter is provided, including：
Circuit part, the circuit part include will from the convert alternating current of alternating current source be direct current rectifying part,
The discharge circuit that discharges in inverter power down to the DC bus for two output ends for being connected to rectifying part and will be straight
Galvanic electricity is transformed to the Converting Unit of alternating current；And
Control unit as described in any one of the above embodiments.
Further, the discharge circuit includes the bus capacitor being connected between the DC bus, is put for storing
Electric energy in electric process.
According to the solution of the present invention, it is shut down by detecting the power down of inverter, the electric discharge of inverter is controlled and referred to
Show, realizes that DC bus remnants discharge of electricity function is controllable when inverter is shut down.Specifically, the access electric discharge electricity when inverter is shut down
Road, with the residual charge on DC bus of releasing in time；And discharge circuit does not access when inverter works normally, on the one hand
Unnecessary loss is reduced, inverter inside temperature will not on the other hand increased, improves system reliability.And further
Indicator light is lighted in discharge circuit work, extinguishes indicator light after the completion of electric discharge, to make by increasing discharge indicating lamp in ground
It is more intuitive to obtain discharge process.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings：
Fig. 1 shows the inverter of the prior art and its structural schematic diagram of control circuit.
Fig. 2 is according to the inverter of one embodiment of the present invention and its structural schematic diagram of control unit.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and
Technical solution of the present invention is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
It is illustrated in combination with fig. 2 inverter and its control unit of the invention first.It is preferred real Fig. 2 shows according to the present invention one
Apply the inverter including control unit of mode.As shown in Fig. 2, the inverter includes circuit part 1 and control unit 2.
The circuit part include will from the convert alternating current of alternating current source be direct current rectifying part 11, inverter stop when pair
It is connected to discharge circuit 12 that the DC bus 14 of two output ends of rectifying part 11 discharges and is by DC power conversion
The Converting Unit 13 of alternating current.The discharge circuit 12 includes the bus capacitor 121 being connected between the DC bus 14.Institute
Bus capacitor 121 is stated for storing the electric energy in discharge process.
Described control unit 2 includes control module 21, rectification side voltage/current sensor 22, the first power supply 23, Yi Ji
Two power supplys 24.The rectification side voltage/current sensor 22 is used to detect the voltage or electric current of rectifying part.First power supply
23 and second source 24 be used to for the control module 21 power supply.Wherein, one end of the first power supply 23 and two DC bus connect
It connects, for powering in inverter work for the control module 21, and preferably Switching Power Supply.The second source 24
Preferably uninterruptible power supply UPS (the Uninterruptible Power System/ that is connect with the alternating current source of one end
Uninterruptible Power Supply).Certainly, other accumulation power supplies also can be selected in the second source 24, in inversion
It powers when device power down to control module 21.The control module 21 is detected according to the rectification side voltage/current sensor 22
Voltage or electric current, judge that inverter is shut down, its power supply is switched to second source from the first power supply by control module 21, with
It discharges DC bus.
Specifically, in a preferred embodiment, the control module 21 includes being capable of providing pwm signal and believing sampling
Number controller handled, specially such as variable frequency drive controller, contactor 211.In the feelings that inverter works normally
Under condition, control module 21 takes electricity through the first power supply 23, such as Switching Power Supply from DC bus 14, after inverter powers on, direct current
Bus 14 establishes potential, and after potential reaches the starting voltage of control module 21, and control module 21 is started to work.At this point, changing
Stream device normally starts.Also, it when inverter works normally, powers to motor and drags loaded work piece, at this point, due to discharge circuit
It does not access, then on the one hand reduces unnecessary loss, inverter inside temperature will not on the other hand increased, that improves system can
By property.
When inverter power down, 14 both end voltage of DC bus is sufficiently large, so that control module 21 and rectification side voltage/electricity
Flow sensor 22 can not stop working immediately.At this point, control module 21 is collected by rectification side voltage/current sensor 22
Voltage or current signal, judge inverter power down.212 control contactor of variable frequency drive controller, so that it is powered
Power supply is switched to UPS from Switching Power Supply 23.Specifically, the sending of the variable frequency drive controller 212 control signal makes contactor
211 coil obtain it is electric so that normally-closed contact K1 disconnect, normally opened contact K2 closure, i.e., power supply is switched from Switching Power Supply 23
To UPS 24, make the variable frequency drive controller 212 that there is stable power supply.Wherein, UPS is in inverter power down to change
Frequency drive control device 212 is powered, and inverter can charge when working normally.
Further, the Converting Unit of the circuit part of the inverter is DC/AC circuit, controls phase in DC/AC circuit
The switching tube answered makes dc-link capacitance, switching tube, machine winding constitute access, to form discharge loop.It is specific at one
In embodiment, the DC/AC circuit is preferably bridge inverter main circuit, three-phase inverter bridge circuit for example, as shown in Figure 2.?
When inverter is shut down because of power down, variable frequency drive controller 212 sends pulse signal, drives the bridge inverter main circuit, makes institute
The bridge arm upper tube and another bridge arm down tube on or off in any two bridge arm of bridge inverter main circuit are stated, to make
It obtains machine winding to be connected in the discharge circuit, discharge for the residual charge to DC bus, such as by institute in Fig. 2
Show the access of UP and VN composition or by UP and the WN access constituted or by VP and WN access constituted, etc..For driving
The pulse signal for moving the bridge inverter main circuit, can choose high level signal or pwm signal.The pulse signal is high
When level, then switching tube is in the conductive state, if the pulse signal takes pwm signal, switching tube is on, turns off back and forth
The state of switching.Also, when selecting high level signal, the remaining discharge of electricity speed on DC bus 14 is fast, but because motor
Winding direct impedance is less big, overcurrent protection easily occurs.When selecting pwm signal, the residual charge on DC bus 14 is put
Slightly slow when electric speed is than selecting high level signal as the pulse signal but more reliable, safety.
Further, described control unit 2 further includes DC bus-bar voltage sensor 26, for detect two DC bus it
Between voltage.The voltage control that the control module 21 is detected according to DC bus-bar voltage sensor 26 by its power supply from
Second source is switched to the first power supply.Specifically, when the electricity that control module 21 is detected by the DC bus-bar voltage sensor
Pressure, at the end of judging the electric discharge of 14 residual charge of DC bus, the output control signal of control module 21 makes the coil of contactor 211
Power down, then contactor 211 normally opened contact K2 disconnect, normally-closed contact K1 closure, in this way, by 21 power supply of control module by
UPS switches to Switching Power Supply.
It is further preferred that the control module 21 further includes contactor coil indicator light, when inverter is shut down, pass through
Variable frequency drive controller realizes that DC bus residual charge is completed to discharge through machine winding, while lighting indicator light instruction and discharging
Journey, until electric discharge is completed, indicator light extinguishes.
Inverter and its control unit of the invention are described above.According to the solution of the present invention, pass through detection
The power down of inverter is shut down, and the electric discharge of inverter is controlled and indicated, realizes DC bus remaining electricity when inverter is shut down
Lotus discharging function is controllable.Specifically, discharge circuit is accessed when inverter is shut down, with the remnants on DC bus that release in time
Charge；And when inverter works normally, discharge circuit is not accessed, and is on the one hand reduced unnecessary loss, on the other hand will not be made
Inverter inside temperature increases, and improves system reliability.And further, by increasing discharge indicating lamp, in discharge circuit
Indicator light is lighted when work, extinguishes indicator light after the completion of electric discharge, so that discharge process is more intuitive.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, according to
According to technical spirit any simple modification, equivalent change and modification to the above embodiments of the invention, this hair is still fallen within
In the range of bright technical solution.
Claims (12)
1. a kind of control unit of inverter, which is characterized in that including：
Control module, rectification side voltage/current sensor, the first power supply and second source；
The rectification side voltage/current sensor is used to detect the voltage or electric current of the rectifying part of inverter；
First power supply, for powering when the inverter works normally for the control module；
The second source, for powering in the inverter power down for the control module；And
The voltage or electric current that the control module is detected according to the rectification side voltage/current sensor, judge the change of current
Device power down, its power supply is switched to second source from first power supply by the control module, with the direct current to inverter
Bus discharges；
Described control unit further includes DC bus-bar voltage sensor, for detecting the voltage between two DC bus；And
The voltage that the control module is detected according to DC bus-bar voltage sensor judges DC bus residual charge electric discharge knot
Its power supply is switched to the first power supply from second source by Shu Shi, control.
2. control unit as described in claim 1, which is characterized in that
First power supply is the Switching Power Supply being connected between DC bus；And/or the second source is to connect with alternating current source
The UPS connect.
3. control unit as described in claim 1, which is characterized in that
The control module includes controller and contactor；
When the controller is by the collected voltage of rectification side voltage/current sensor or current signal, inverter is judged
Power down, then the controller controls the contactor, so that the normally-closed contact of contactor disconnects, and normally opened contact is closed, thus
The power supply is switched to second source from first power supply, is discharged with the DC bus to inverter.
4. control unit as claimed in claim 2, which is characterized in that
The control module includes controller and contactor；
When the controller is by the collected voltage of rectification side voltage/current sensor or current signal, inverter is judged
Power down, then the controller controls the contactor, so that the normally-closed contact of contactor disconnects, and normally opened contact is closed, thus
The power supply is switched to second source from first power supply, is discharged with the DC bus to inverter.
5. control unit according to any one of claims 1-4, which is characterized in that
In the inverter power down, the control module sends pulse signal, drives the DC/AC circuit of inverter, makes described
Corresponding switching tube, bus capacitor and machine winding constitute access in DC/AC circuit, so that discharge loop is formed, to straight
The residual charge of stream bus discharges.
6. control unit as claimed in claim 5, which is characterized in that wherein,
The DC/AC circuit is bridge inverter main circuit, and the control module sends pulse signal, drives the bridge type inverse electricity
Road makes a bridge arm upper tube and another bridge arm down tube conducting in any two bridge arm of the bridge inverter main circuit or closes
Disconnected, i.e., corresponding switching tube, bus capacitor and machine winding constitute access in the described bridge inverter main circuit, so that composition is put
Electrical circuit is discharged with the residual charge to DC bus.
7. control unit as claimed in claim 5, which is characterized in that
It is high level signal or pwm signal for driving the pulse signal of the DC/AC circuit.
8. control unit as described in claim 3 or 4, which is characterized in that
Described control unit further includes DC bus-bar voltage sensor, for detecting the voltage between two DC bus；And
The voltage that the control module is detected according to DC bus-bar voltage sensor, control is by its power supply from second source
It is switched to the first power supply.
9. control unit as claimed in claim 8, which is characterized in that
When the voltage that control module is detected by the DC bus-bar voltage sensor, DC bus residual charge electric discharge knot is judged
Shu Shi, control module output control signal, makes the coil power down of the contactor, then the normally opened contact of contactor disconnects, normally closed
Contact closure, so that the power supply of control module is switched to the first power supply by second source.
10. such as claim 3,4 or 9 described in any item control units, which is characterized in that
The control module further includes contactor coil indicator light, for lighting when discharge circuit discharges, to indicate to discharge
Process.
11. a kind of inverter, which is characterized in that including：
Circuit part, the circuit part include by the convert alternating current from alternating current source be direct current rectifying part, changing
The discharge circuit that discharges when flowing device power down to the DC bus for two output ends for being connected to rectifying part and by direct current
It is transformed to the Converting Unit of alternating current；And
Such as the described in any item control units of claim 1-10.
12. inverter as claimed in claim 11, which is characterized in that
The discharge circuit includes the bus capacitor being connected between the DC bus, for storing the electricity in discharge process
Energy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610656910.4A CN106301000B (en) | 2016-08-11 | 2016-08-11 | Inverter and its control unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610656910.4A CN106301000B (en) | 2016-08-11 | 2016-08-11 | Inverter and its control unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106301000A CN106301000A (en) | 2017-01-04 |
| CN106301000B true CN106301000B (en) | 2018-11-23 |
Family
ID=57668802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610656910.4A Active CN106301000B (en) | 2016-08-11 | 2016-08-11 | Inverter and its control unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106301000B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101534083A (en) * | 2008-03-12 | 2009-09-16 | 通用汽车环球科技运作公司 | DC bus discharge in an electric motor system |
| JP2013055821A (en) * | 2011-09-05 | 2013-03-21 | Toyota Motor Corp | Power apparatus |
| CN103562108A (en) * | 2011-05-27 | 2014-02-05 | 三菱电机株式会社 | Control device for elevator |
| CN103904776A (en) * | 2014-03-27 | 2014-07-02 | 国网浙江省电力公司舟山供电公司 | Intelligent power distribution room power system |
| CN103916059A (en) * | 2012-12-28 | 2014-07-09 | 北京中纺锐力机电有限公司 | Switched-reluctance-motor speed adjusting device |
| CN204119111U (en) * | 2014-10-31 | 2015-01-21 | 施耐德东芝换流器欧洲公司 | Motor driver |
| CN204761143U (en) * | 2015-06-16 | 2015-11-11 | 广州日滨科技发展有限公司 | Frequency conversion door machine controller |
| CN205992860U (en) * | 2016-08-11 | 2017-03-01 | 珠海格力电器股份有限公司 | Inverter and its control unit |
-
2016
- 2016-08-11 CN CN201610656910.4A patent/CN106301000B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101534083A (en) * | 2008-03-12 | 2009-09-16 | 通用汽车环球科技运作公司 | DC bus discharge in an electric motor system |
| CN103562108A (en) * | 2011-05-27 | 2014-02-05 | 三菱电机株式会社 | Control device for elevator |
| JP2013055821A (en) * | 2011-09-05 | 2013-03-21 | Toyota Motor Corp | Power apparatus |
| CN103916059A (en) * | 2012-12-28 | 2014-07-09 | 北京中纺锐力机电有限公司 | Switched-reluctance-motor speed adjusting device |
| CN103904776A (en) * | 2014-03-27 | 2014-07-02 | 国网浙江省电力公司舟山供电公司 | Intelligent power distribution room power system |
| CN204119111U (en) * | 2014-10-31 | 2015-01-21 | 施耐德东芝换流器欧洲公司 | Motor driver |
| CN204761143U (en) * | 2015-06-16 | 2015-11-11 | 广州日滨科技发展有限公司 | Frequency conversion door machine controller |
| CN205992860U (en) * | 2016-08-11 | 2017-03-01 | 珠海格力电器股份有限公司 | Inverter and its control unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106301000A (en) | 2017-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101277085B (en) | Motor drive device | |
| CN107204713B (en) | Mutually missing detection in Active Front End Converter | |
| CN103094825B (en) | Laser power supply device | |
| CN105529796B (en) | Subsidiary engine test device in a kind of battery charging circuit and library | |
| CN106385101B (en) | Method and device for realizing power supply of high-power elevator automatic rescue device | |
| EP2290785A2 (en) | Power-saving line interactive uninterruptible power system | |
| JP2013176251A (en) | Power supply device | |
| CN105406580A (en) | Power supply system and method | |
| CN104682543B (en) | A kind of mixed power supply system based on DC frequency-changing generating set | |
| CN203406658U (en) | Storage battery detection device of direct current system | |
| CN108429453A (en) | On-board high-voltage inversion conversion equipment and control method | |
| CN107181414A (en) | A kind of comprehensive power quality high-frequency rectification inverse control system | |
| CN205992860U (en) | Inverter and its control unit | |
| CN106301000B (en) | Inverter and its control unit | |
| CN212708991U (en) | Vehicle-mounted charger with pre-charging and discharging functions | |
| CN109560585A (en) | Circuit, energy storage device and control method are restarted in a kind of battery over-discharge | |
| US9130500B2 (en) | AC motor drive device | |
| CN108808834B (en) | On-line uninterrupted power supply and control method thereof | |
| CN108199572B (en) | Frequency converter and power-off protection system thereof | |
| CN111186449B (en) | Electric drive system | |
| CN207466410U (en) | A kind of electric vehicle electricity system | |
| CN106451751B (en) | A kind of EPS power-supply system that lithium battery intelligent can be controlled | |
| JP2016174473A (en) | Converter device | |
| JP5602605B2 (en) | Power supply device for electric hoisting and traversing device | |
| CN202872450U (en) | Cold boot circuit for UPS power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |