CN105991059A - Inverter system and method of reducing capacitance of inverter DC bus - Google Patents
Inverter system and method of reducing capacitance of inverter DC bus Download PDFInfo
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Abstract
The present invention provides an inverter system and a method of reducing inverter DC bus capacitor The inverter system comprises an AC power supply, an AC/DC converter, a DC bus capacitor, an unidirectional DC/DC converter, a DC auxiliary power supply and a DC/AC converter. The output end and the input end of the unidirectional DC/DC converter are connected with the DC bus capacitor and the DC auxiliary power supply respectively, and the AC power supply is in series connection with the AC/DC converter, then is in parallel connection with the DC bus capacitor, and then is connected with the DC/AC converter. When the voltages at the two ends of a DC bus are less than a preset voltage, the DC auxiliary power supply outputs energy to the DC bus capacitor. The present invention also provides the method of reducing the inverter DC bus capacitor. The method is applied to the above inverter system, and comprises the steps of acquiring the voltages at the two ends of the DC bus capacitor, comparing the voltages with the preset voltage, if the voltages are less than the preset voltage, triggering the unidirectional DC/DC converter to conduct, and using the DC auxiliary power supply to output energy to the DC bus capacitor.
Description
Technical field
The present invention relates to power electronics, motor-drive technique field, particularly relate to a kind of reduce the inverse of dc-link capacitance
Become device system and control method.
Background technology
In inverter field, owing to the capacity needing dc-link capacitance is very big, generally use electrochemical capacitor, however electric
Solving electric capacity increasing along with the working time, electrolyte can slowly volatilize, and corresponding capacitance will reduce, stability
Difference becomes, and reduces the complete machine service life of inverter.Increasingly focusing on life of product instantly, electrochemical capacitor due to
Its life-span short shortcoming is the most gradually substituted by thin-film capacitor, but the capacity of thin-film capacitor is less relative to electrochemical capacitor, because of
This, for using thin-film capacitor, there has been proposed the topological structure reducing bus capacitor.Traditional reduces opening up of bus capacitor
Flutterring structure and include a two-way DC/DC changer and auxiliary capacitor C1, one end of two-way DC/DC changer connects
Auxiliary capacitor C1, the other end connects dc-link capacitance Cdc, sees accompanying drawing 1.When inverter load is less, directly
Energy on stream bus capacitor Cdc is higher, and therefore dc-link capacitance Cdc passes through two-way DC/DC changer to auxiliary
Electric capacity C1 is helped to charge, by unnecessary energy storage on auxiliary capacitor C1；When loading bigger when, auxiliary electricity
Hold C1 by two-way DC/DC changer to dc-link capacitance Cdc feedback energy, by this energy exchange
Method, reduces the size of dc-link capacitance Cdc.Above-mentioned conventional topologies structure becomes owing to using two-way DC/DC
Parallel operation, energy can between auxiliary capacitor C1 and dc-link capacitance Cdc two-way exchange, this mode not only reduces
The efficiency of whole inverter, and require that auxiliary capacitor C1 must be sufficiently large, otherwise cannot effectively reduce direct current female
Line capacitance Cdc.Being electric capacity due to C1 again, the flash-over characteristic of itself determines when it is to dc-link capacitance Cdc
The when of feedback energy, it is impossible to ensureing the seriality of feedback energy, the performance of whole inverter system may be affected.
Summary of the invention
The present invention is directed to the defect that in background technology, inverter system exists: dc-link capacitance is relatively big, the work of inverter
Make efficiency low and it cannot be guaranteed that to the seriality of dc-link capacitance conveying energy, propose a kind of inverter system and subtract
The method of little inverter dc-link capacitance.
The present invention solves above-mentioned technical problem by following technical proposals:
One aspect of the present invention provides a kind of inverter system, and described inverter system includes: alternating current power supply, AC/DC
Changer, dc-link capacitance, unidirectional DC/DC changer, DC auxiliary supply and DC/AC changer；Described
Two outfans of unidirectional DC/DC changer connect the two ends of described dc-link capacitance respectively；Described unidirectional
The input of DC/DC changer connects described DC auxiliary supply；Described alternating current power supply is connected with AC/DC changer
It is connected in parallel with described dc-link capacitance afterwards, then connects the input of described DC/AC changer；When described directly
When the voltage at stream bus capacitor two ends is less than the running voltage preset, described DC auxiliary supply is by described unidirectional
DC/DC changer exports energy to described dc-link capacitance.
In one embodiment, described system also includes: a voltage collection circuit, connects described dc-link capacitance two ends,
For gathering the voltage at described dc-link capacitance two ends.
In one embodiment, described system also includes: one triggers circuit, the input of described triggering circuit and described electricity
Pressure Acquisition Circuit outfan connects, and the outfan of described triggering circuit is connected with described unidirectional DC/DC changer, when
When the voltage of described dc-link capacitance is less than described default running voltage, unidirectional described in described trigger circuit triggers
DC/DC changer works, and described DC auxiliary supply passes through described unidirectional DC/DC changer to described dc bus
Electric capacity output energy.
In one embodiment, the input of described DC auxiliary supply connects filter capacitor.
In one embodiment, described DC auxiliary supply is anti exciting converter.
In one embodiment, described voltage collection circuit includes: resistance and voltmeter.
In one embodiment, described unidirectional DC/DC changer is Buck changer.
Another aspect of the present invention provides a kind of method reducing inverter dc-link capacitance, is applied to described inverter
System, described method includes: gather the voltage at dc-link capacitance two ends；By described voltage and described default work
Make voltage row to compare；If described voltage is less than described default running voltage, trigger the work of unidirectional DC/DC changer,
Described DC auxiliary supply is made to export energy by described unidirectional DC/DC changer to described dc-link capacitance.
In one embodiment, the input of described DC auxiliary supply connects filter capacitor.
In one embodiment, described DC auxiliary supply is anti exciting converter.
In one embodiment, the voltage at described collection dc-link capacitance two ends, specifically include: at described dc bus
An electric capacity two ends resistance in parallel；Measure the voltage at described resistance two ends, as the voltage at described dc-link capacitance two ends.
The present invention can effectively reduce dc-link capacitance, improves the efficiency of inverter system simultaneously, and ensure that to directly
The seriality of stream bus capacitor feedback energy.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only
It is some embodiments of the present invention, for those of ordinary skill in the art, in the premise not paying creative work
Under, it is also possible to other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the inverter system topological structure schematic diagram reducing dc-link capacitance traditional in prior art；
Fig. 2 is embodiment of the present invention inverter system topological structure schematic diagram；
Fig. 3 is that the embodiment of the present invention unidirectional DC/DC changer uses Buck changer, DC auxiliary supply to use
The topological structure schematic diagram of anti exciting converter；
Fig. 4 is inverter system the opening up in PLECS simulation software that the embodiment of the present invention reduces dc-link capacitance
Flutter structure chart；
Fig. 5 is the embodiment of the present invention when connecting Buck changer and being not connected to Buck changer, dc bus electricity
Hold the voltage oscillogram at two ends.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.
Based on the embodiment in the present invention, those of ordinary skill in the art are obtained under not making creative work premise
Every other embodiment, broadly falls into the scope of protection of the invention.
In inverter system, traditional topological structure reducing dc-link capacitance includes that a two-way DC/DC becomes
Parallel operation 104 and auxiliary capacitor 105, one end of two-way DC/DC changer 104 connects auxiliary capacitor 105, the other end
Connect dc-link capacitance 103, as shown in Figure 1.When inverter load 107 consumed energies less time, energy will
Dc-link capacitance 103 stores, but because dc-link capacitance 103 capacity is less, it is impossible to store relatively multi-energy,
Therefore, dc-link capacitance 103 is charged to auxiliary capacitor 105, by unnecessary by two-way DC/DC changer 104
Energy storage on auxiliary capacitor 105；When loading 107 consumed energies and being more, dc-link capacitance 103 due to
Capacity is less, and the energy that it stores is not enough to band dynamic load, and auxiliary capacitor 105 is by two-way DC/DC changer
104 to dc-link capacitance 103 feedback energy.By the method for above-mentioned energy exchange, reach to reduce dc bus electricity
Hold the purpose of 103.Two-way DC/DC changer 104 in above-mentioned traditional inverter system topological structure is due to one
Directly keep two-way admittance, make energy two-way exchange between auxiliary capacitor 105 and dc-link capacitance 103, this energy
The two-way exchange of amount reduces the work efficiency of whole inverter, and requires that auxiliary capacitor 105 must be sufficiently large, energy
Enough store the energy that dc-link capacitance 103 cannot store, otherwise cannot effectively reduce dc-link capacitance 103, and
And the flash-over characteristic of auxiliary capacitor 105 itself determines when it is to dc-link capacitance 103 feedback energy, it is impossible to protect
The seriality of card feedback energy, the performance of whole inverter system may be affected.
In order to solve the problems referred to above, embodiments providing a kind of inverter system, Fig. 2 is the embodiment of the present invention
Reduce the inverter system topological structure schematic diagram of dc-link capacitance.This inverter system includes: alternating current power supply 201,
AC/DC changer 202, dc-link capacitance 203, unidirectional DC/DC changer 206, DC auxiliary supply 207,
DC/AC changer 208 and load 209.The outfan of unidirectional DC/DC changer 206 connects dc-link capacitance
203, the input of unidirectional DC/DC changer 206 connects the outfan of DC auxiliary supply 207.Alternating current power supply
201 be connected with AC/DC changer 202 after in parallel with dc-link capacitance 203, then by DC/AC changer
208 connect load 209.This system also includes voltage collection circuit 204, triggers circuit 205.Wherein, voltage acquisition
Circuit 204 is connected to the two ends of dc-link capacitance 203, for gathering the voltage at dc-link capacitance 203 two ends；
Trigger circuit 205 input is connected with the outfan of voltage collection circuit 204, triggering circuit 205 outfan and
Unidirectional DC/DC changer 206 connects, and is used for when dc-link capacitance 203 both end voltage is less than predeterminated voltage,
Trigger unidirectional DC/DC changer 206 to turn on.
When load 209 is relatively big, and the energy that dc-link capacitance 203 stores is not enough to supply load, dc bus
The voltage at electric capacity 203 two ends declines, when the voltage that voltage collection circuit 204 collects is less than the running voltage preset,
Triggering circuit 205 triggers unidirectional DC/DC changer 206 and turns on, and now DC auxiliary supply 207 is by unidirectional
DC/DC changer 206 exports energy to dc bus 203, in order to supply load 209.When loading 209 and being less,
The voltage on dc-link capacitance 203 that voltage collection circuit 204 collects is not less than default running voltage, now
Triggering circuit 205 does not trigger unidirectional DC/DC changer 206 and turns on, and DC auxiliary supply 207 cannot be by unidirectional
DC/DC changer 206 provides energy to dc-link capacitance 203, makes dc-link capacitance 203 without storing relatively
Many energy, effectively reduce dc-link capacitance 203.
The present invention " unidirectional DC/DC changer 206+ DC auxiliary supply 207 " structure substitutes conventional inverter system
" two-way DC/DC changer 104+ auxiliary capacitor 105 " structure in system, effectively reduces dc-link capacitance 203,
And the one-way conduction characteristic of unidirectional DC/DC changer 206 ensure that energy can only from DC auxiliary supply 207 to
Dc-link capacitance 203 transmits, and improves the work efficiency of inverter system, it is ensured that to dc-link capacitance 203
The seriality of feedback energy.
In one embodiment, voltage collection circuit 204 includes: resistance and voltmeter.The present invention is only with resistance and voltage
Table illustrates, and when being embodied as, needs resistor coupled in parallel at the two ends at dc-link capacitance 203, utilizes voltage
The magnitude of voltage of above-mentioned resistance measured by table, as the voltage of dc-link capacitance.In one embodiment, circuit 205 is triggered
Can be voltage comparator, the present invention only illustrates with voltage comparator, and the present invention is not limited.
When being embodied as, if unidirectional DC/DC changer 206 being set to high level conducting, then by above-mentioned voltage ratio
The input voltage of the normal phase input end of relatively device is set to the default running voltage of dc-link capacitance 203, and inverting input is even
Connect the outfan of voltage collection circuit 204.When the voltage at dc-link capacitance 203 two ends reduces, preset less than it
During running voltage, when i.e. the anti-phase input terminal voltage of voltage comparator is less than normal phase input end voltage, above-mentioned voltage ratio is relatively
Device output high trigger signal, triggers unidirectional DC/DC changer 206 and turns on, now DC auxiliary supply 207
Energy is provided to dc-link capacitance 203 by unidirectional DC/DC changer 206.If by unidirectional DC/DC changer
206 are set to low level conducting, then the normal phase input end of above-mentioned voltage comparator is connected voltage collection circuit 204
Outfan, the input voltage of inverting input is set to the default running voltage of dc-link capacitance 203, works as dc bus
The voltage at electric capacity 203 two ends reduces, during less than its running voltage preset, i.e. and the inverting input electricity of voltage comparator
When pressure is less than normal phase input end voltage, above-mentioned voltage comparator output low level triggers signal, triggers unidirectional DC/DC
Changer 206 turns on, and now DC auxiliary supply 207 is electric to dc bus by unidirectional DC/DC changer 206
203 offer energy are provided.
In the above-described embodiments, owing to the input voltage of voltage comparator positive and negative phase input is the least, it is to the maximum
5V, but in inverter system, the voltage at dc-link capacitance two ends is higher, and corresponding default running voltage is the most relatively
Height, therefore, by dc-link capacitance 203 both end voltage, preset running voltage be connected to voltage comparator just,
During inverting input, first it is depressured to below 5V, then accesses voltage comparator and compare.
In one embodiment, the outfan of DC auxiliary supply 207 filter capacitor (not shown in Fig. 2) in parallel,
Unidirectional current for exporting DC auxiliary supply 207 is filtered, and the voltage making DC auxiliary supply 207 export is
One steady state value, it is ensured that carry the seriality of energy to dc-link capacitance 203.
The unidirectional preferred Buck changer of DC/DC changer 206 in the present invention, DC auxiliary supply 207 is the most anti-
Exciting converter.As it is shown on figure 3, use anti exciting converter 211, list for embodiment of the present invention DC auxiliary supply 207
The topological structure schematic diagram of Buck changer 210 is used to DC/DC changer 206.This inverter system includes:
Alternating current power supply 201, AC/DC changer 202, dc-link capacitance 203, voltage collection circuit 204, triggering electricity
Road 205, Buck changer 210, anti exciting converter 211, DC/AC changer 208 and load 209.Buck
The outfan of changer 210 connects dc-link capacitance 203, and the input of Buck changer 210 connects inverse-excitation converting
The direct-flow input end of device 211.Alternating current power supply 201 be connected with AC/DC changer 202 after with dc-link capacitance 203
Parallel connection, then connects load 209 by DC/AC changer 208.It is female that voltage collection circuit 204 is connected to direct current
The two ends of line capacitance 203, for gathering the voltage at dc-link capacitance 203 two ends.Trigger the input of circuit 205
Being connected with the outfan of voltage collection circuit 204, the outfan triggering circuit 205 is connected with Buck changer 210.
When the voltage of dc-link capacitance 203 is less than the running voltage preset, anti exciting converter 211 is converted by Buck
Device 210 carries energy to dc-link capacitance 203.
Fig. 4 is inverter system the opening up in PLECS simulation software that the embodiment of the present invention reduces dc-link capacitance
Flutter structure chart (voltage collection circuit 204 and triggering circuit 205 not shown in figure).The virtual value of alternating current power supply 201
Being set to 220V, frequency is set to 50Hz；Diode bridge rectifier circuit selected by AC/DC changer 202；Direct current is female
The capacitance of line capacitance 203 is set to 5 μ F；Buck changer 210 selected by unidirectional DC/DC changer, and is set to height
Level turns on；The DC voltage of anti exciting converter 211 output is 300V；PWM selected by DC/AC changer 208
Inverter；The load 209 variable resistive load of selection, this variable resistive load minimum load resistance is 30 Ω, is to the maximum
300 Ω, and the resistance value of this variable resistive load changes over, period of change is set to 20ms, i.e. a cycle
In, load 209 and be uniformly reduced to 30 Ω from 300 Ω or uniformly increase to 300 Ω from 30 Ω；Dc-link capacitance
The default running voltage of 203 is set to 100V.
In the case of connecting Buck changer 210 and being not connected with 210 two kinds of Buck changer, measure Fig. 4 respectively
The voltage of middle AB point-to-point transmission, i.e. the voltage at dc-link capacitance 203 two ends, obtains voltage oscillogram as shown in Figure 5.
Curve 1 is solid line, is in artificial circuit in the case of connection Buck changer 210, dc-link capacitance 203 liang
The voltage waveform of end.Wherein, the resistance value of the load 209 that a point is corresponding is 300 Ω, now dc-link capacitance 203
The voltage at two ends is the highest, reaches 311V；The resistance value of the load 209 that c point is corresponding is 30 Ω, now dc bus
The voltage at electric capacity 203 two ends is minimum, for 0V.Resistance value in load 209 is reduced to the process of 30 Ω from 300 Ω
In, the energy of load consumption gradually increases, and dc-link capacitance 203 both end voltage is gradually lowered, when voltage acquisition electricity
The voltage that road collects is less than when presetting running voltage 100V, and trigger circuit triggers Buck changer 210 turns on,
B point in Fig. 5 represents Buck changer 210 and turns on, anti exciting converter 211 by Buck changer 210 to
Dc-link capacitance 203 carries energy.Afterwards, the voltage at dc-link capacitance 203 two ends is because of anti exciting converter 211
Conveying energy and rise, when the voltage that voltage collection circuit collects higher than preset running voltage 100V time, Buck
Changer 210 turns off, and the d point in Fig. 5 represents Buck changer 210 and turns off, and anti exciting converter 211 can not lead to
Cross Buck changer 210 to continue to export energy to dc-link capacitance 203.
Curve 2 is dotted line, is to be not connected with in artificial circuit under Buck changer 210 circuit conditions, dc bus
The voltage waveform at electric capacity 203 two ends.Resistance value (i.e. song during 300 Ω are reduced to 30 Ω in load 209
Ab section on line 2), the energy of load 209 consumption gradually increases, and dc-link capacitance 203 both end voltage gradually drops
Low, owing to being not connected with Buck changer 210, anti exciting converter 211 cannot carry energy to dc-link capacitance 203
Amount, therefore the voltage at dc-link capacitance 203 two ends continues to reduce, directly after less than default running voltage 100V
When resistance value to load 209 reaches 30 Ω, dc-link capacitance 203 both end voltage is reduced to 0V, such as curve 2
On bc section.Afterwards, when the resistance value loading 209 is gradually increased from 30 Ω, the energy of load 209 consumption subtracts
Few, the voltage at dc-link capacitance 203 two ends gradually goes back up to 100V, such as the cd section on curve 2, direct current afterwards
The voltage at bus capacitor 203 two ends gos up along with the increase of the resistance value of load 209.
It can be seen that inverter system is connected to Buck changer 210, at dc-link capacitance from simulation waveform
When 203 both end voltage are less than 100V, anti exciting converter 211 can be made to direct current by the conducting of Buck changer 210
Bus capacitor 203 carries energy, so that dc-link capacitance 203 both end voltage raises, along with the electricity of load 209
The increase of resistance, the energy consumed gradually decreases, and the energy that anti exciting converter 211 is persistently supplied, and direct current is female
The voltage at line capacitance 203 two ends gradually gos up, but voltage interior (i.e. bd section on curve 1) during this period of time does not surpasses
Crossing the peak value (i.e. 311V) of dc-link capacitance 203 voltage, the voltage therefore born on dc-link capacitance 203 should
Power will not increase.If inverter system is not connected with Buck changer 210, and to obtain just the same with curve 1
Voltage waveform, only by strengthen dc-link capacitance 203 method, as connect Buck changer 210 feelings
Under condition, dc-link capacitance 203 only 5 μ F, and if be not connected to Buck changer 210, then direct current mother
Line capacitance 203 at least 150 μ F, just can obtain the curve as the voltage waveform shown in curve 1.
The present invention applies specific embodiment principle and the embodiment of the present invention are set forth, above example
Explanation be only intended to help to understand method and the core concept thereof of the present invention；General technology simultaneously for this area
Personnel, according to the thought of the present invention, the most all will change, in sum,
This specification content should not be construed as limitation of the present invention.
Claims (11)
1. an inverter system, it is characterised in that described system includes: alternating current power supply, AC/DC changer,
Dc-link capacitance, unidirectional DC/DC changer, DC auxiliary supply and DC/AC changer；
Two outfans of described unidirectional DC/DC changer connect the two ends of described dc-link capacitance respectively；Described
The input of unidirectional DC/DC changer connects described DC auxiliary supply；Described alternating current power supply and AC/DC changer
It is connected in parallel with described dc-link capacitance after connection, then connects the input of described DC/AC changer；
When the voltage at described dc-link capacitance two ends is less than the running voltage preset, described DC auxiliary supply passes through
Described unidirectional DC/DC changer exports energy to described dc-link capacitance.
Inverter system the most according to claim 1, it is characterised in that described system also includes a: voltage
Acquisition Circuit, connects described dc-link capacitance two ends, for gathering the voltage at described dc-link capacitance two ends.
Inverter system the most according to claim 2, it is characterised in that described system also includes: one triggers
Circuit, the input of described triggering circuit is connected with described voltage collection circuit outfan, the output of described triggering circuit
End is connected with described unidirectional DC/DC changer, when the voltage of described dc-link capacitance is less than described default work
During voltage, unidirectional DC/DC changer work described in described trigger circuit triggers, described DC auxiliary supply passes through institute
State unidirectional DC/DC changer and export energy to described dc-link capacitance.
Inverter system the most according to claim 1, it is characterised in that the input of described DC auxiliary supply
End connects filter capacitor.
5. according to the inverter system described in claim 1-4 any claim, it is characterised in that described direct current
Accessory power supply is anti exciting converter.
Inverter system the most according to claim 5, it is characterised in that described voltage collection circuit includes:
Resistance and voltmeter.
Inverter system the most according to claim 6, it is characterised in that described unidirectional DC/DC changer is
Buck changer.
8. the method reducing inverter dc-link capacitance, is applied to the inverter system described in claim 1,
It is characterized in that, described method includes:
Gather the voltage at dc-link capacitance two ends；
Described voltage is compared with described default running voltage row；
If described voltage less than described default running voltage, triggers the work of unidirectional DC/DC changer, make described directly
Stream accessory power supply exports energy by described unidirectional DC/DC changer to described dc-link capacitance.
Method the most according to claim 8, it is characterised in that the input of described DC auxiliary supply connects
Filter capacitor.
Method the most according to claim 8 or claim 9, it is characterised in that described DC auxiliary supply is that flyback becomes
Parallel operation.
11. methods according to claim 10, it is characterised in that described collection dc-link capacitance two ends
Voltage, specifically includes:
A resistance in parallel at described dc-link capacitance two ends；
Measure the voltage at described resistance two ends, as the voltage at described dc-link capacitance two ends.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510046729.7A CN105991059A (en) | 2015-01-29 | 2015-01-29 | Inverter system and method of reducing capacitance of inverter DC bus |
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| CN201510046729.7A CN105991059A (en) | 2015-01-29 | 2015-01-29 | Inverter system and method of reducing capacitance of inverter DC bus |
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| CN107257160A (en) * | 2017-06-30 | 2017-10-17 | 深圳奥特迅电力设备股份有限公司 | A kind of DC operation power supply system and its control method |
| CN107317486A (en) * | 2017-07-21 | 2017-11-03 | 深圳市赛格瑞电子有限公司 | A kind of ac buck circuit |
| CN107482892A (en) * | 2017-08-10 | 2017-12-15 | 华为技术有限公司 | Energy snubber circuit and current transformer |
| CN110138227A (en) * | 2019-06-03 | 2019-08-16 | 一巨自动化装备（上海）有限公司 | A kind of busbar voltage discharge circuit of the Emergency Power based on Flyback |
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| CN107482892A (en) * | 2017-08-10 | 2017-12-15 | 华为技术有限公司 | Energy snubber circuit and current transformer |
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| CN111082671A (en) * | 2018-10-19 | 2020-04-28 | 奥的斯电梯公司 | Power management in an elevator system |
| CN111082671B (en) * | 2018-10-19 | 2023-07-18 | 奥的斯电梯公司 | Power management in an elevator system |
| CN110138227A (en) * | 2019-06-03 | 2019-08-16 | 一巨自动化装备（上海）有限公司 | A kind of busbar voltage discharge circuit of the Emergency Power based on Flyback |
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Application publication date: 20161005 |