CN205724934U - Low pressure H bridge cascaded topology photovoltaic system and current sensing means thereof and inverter - Google Patents
Low pressure H bridge cascaded topology photovoltaic system and current sensing means thereof and inverter Download PDFInfo
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- CN205724934U CN205724934U CN201620645013.9U CN201620645013U CN205724934U CN 205724934 U CN205724934 U CN 205724934U CN 201620645013 U CN201620645013 U CN 201620645013U CN 205724934 U CN205724934 U CN 205724934U
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- bridge
- cascaded topology
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
Described low pressure H bridge cascaded topology photovoltaic system that the application provides and current sensing means and inverter, by the switching tube electric current of sampling resistor sampling H bridge inverter unit, generate voltage signal;By filtering and amplifying circuit described voltage signal is amplified and more than half grid cycle filtering, generates overcurrent protection signal and the current signal of photovoltaic module.The current sensing means of whole low pressure H bridge cascaded topology photovoltaic system only includes a sampling resistor, described overcurrent protection signal and the current signal of described photovoltaic module can be obtained;Decrease the sampling resistor quantity of half compared to existing technology, reduce the current sample cost of system.
Description
Technical field
This utility model relates to technical field of photovoltaic power generation, particularly relate to a kind of low pressure H bridge cascaded topology photovoltaic system and
Its current sensing means and inverter.
Background technology
In current photovoltaic system, owing to H bridge cascade connection type topology can realize the output of many level with low switching frequency, because of
This gradually obtains application.Common low pressure H bridge cascaded topology photovoltaic system is general as it is shown in figure 1, include several photovoltaic modulies
PV, several H bridge inverter unit, a main power filter (not showing in figure) and master controller (not showing in a figure) structure
Become.
Owing to the overcurrent protection of main power can be realized by detection grid-connected current, but in the situation of communication failure
Under, master controller can not issue PWM locking signal in time, will result in the damage of H bridge inverter unit.It is thus desirable to each H
Bridge inversion unit realizes single overcurrent protection, namely the current signal of each H bridge inverter unit breaker in middle pipe that needs to sample.Separately
Outward, due to the I-V characteristic that photovoltaic module is special, need photovoltaic module carries out MPPT (Maximum Power Point
Tracking, MPPT maximum power point tracking) control, namely the current signal of each photovoltaic module PV that needs to sample.
Prior art generally uses two sampling resistor R1 and R2 as shown in Figure 1 to obtain the electric current letter of photovoltaic module respectively
Number and the current signal of switching tube.But, owing to the maximum power point voltage of single photovoltaic module PV only has tens volts, in low pressure
For obtaining high grid-connected voltage in H bridge cascade connection type topology photovoltaic system, the H bridge inverter unit of series connection generally compares many, so will
Cause the enormous amount of sampling resistor, add the current sample cost of system.
Utility model content
In view of this, this utility model provides a kind of low pressure H bridge cascaded topology photovoltaic system and current sensing means thereof
And inverter, to reduce the current sample cost of system.
To achieve these goals, the technical scheme that this utility model embodiment provides is as follows:
A kind of current sensing means of low pressure H bridge cascaded topology photovoltaic system, including:
The switching tube electric current of sampling H bridge inverter unit, generates the sampling resistor of voltage signal;Described sampling resistor is connected to
Between one H bridge inverter unit and the corresponding DC bus capacitor of low pressure H bridge cascaded topology photovoltaic system;
Described voltage signal is amplified and more than half grid cycle filtering, generates overcurrent protection signal and photovoltaic
The filtering and amplifying circuit of the current signal of assembly;Two inputs of described filtering and amplifying circuit respectively with described sampling resistor
Two ends are connected.
Preferably, described filtering and amplifying circuit includes:
Described voltage signal is amplified, generates the first operational amplifier of described overcurrent protection signal;Described first
Two inputs of operational amplifier two ends with described sampling resistor respectively are connected;
Described voltage signal is amplified and more than half grid cycle filtering, generates the electric current of described photovoltaic module
Second operational amplifier of signal;Two inputs of described second operational amplifier respectively with the two ends phase of described sampling resistor
Even.
Preferably, after described first operational amplifier is also for being amplified described voltage signal, then Preset Time is carried out
Filtering, just generate the operational amplifier of described overcurrent protection signal.
Preferably, described filtering and amplifying circuit includes:
Described voltage signal is amplified, generates the amplifying circuit of described overcurrent protection signal;Described amplifying circuit
Two inputs two ends with described sampling resistor respectively are connected;
Described overcurrent protection signal is carried out the filtering of more than half grid cycle, generates the electric current letter of described photovoltaic module
Number filter circuit;The input of described filter circuit is connected with the outfan of described amplifying circuit.
Preferably, described filter circuit is digital filter circuit or active filter.
The inverter of a kind of low pressure H bridge cascaded topology photovoltaic system, including: DC bus capacitor, H bridge inverter unit and as above
State the current sensing means of arbitrary described low pressure H bridge cascaded topology photovoltaic system;Wherein:
The input of the inverter of the two ends of described DC bus capacitor and described low pressure H bridge cascaded topology photovoltaic system and
The photovoltaic module of low pressure H bridge cascaded topology photovoltaic system is connected;
The current sensing means of described low pressure H bridge cascaded topology photovoltaic system is connected to described DC bus capacitor and described H
Between bridge inversion unit;
The outfan of the current sensing means of described low pressure H bridge cascaded topology photovoltaic system and described H bridge inverter unit
Control end to be connected with the master controller of described low pressure H bridge cascaded topology photovoltaic system.
A kind of low pressure H bridge cascaded topology photovoltaic system, including: n photovoltaic module, main power filter, a master
Controller and the inverter of n low pressure H bridge cascaded topology photovoltaic system as described above;N is the positive integer more than 1;Wherein:
The input of the inverter of described n photovoltaic module and n described low pressure H bridge cascaded topology photovoltaic system one a pair
Should be connected;
The outfan series connection of the inverter of n described low pressure H bridge cascaded topology photovoltaic system;The two ends of series connection are by described
Main power filter is connected with electrical network.
Preferably, also include: n the current foldback circuit receiving corresponding overcurrent protection signal.
The current sensing means of the described low pressure H bridge cascaded topology photovoltaic system that the application provides, is adopted by sampling resistor
The switching tube electric current of sample H bridge inverter unit, generates voltage signal;By filtering and amplifying circuit, described voltage signal is amplified
With filtering more than half grid cycle, generate overcurrent protection signal and the current signal of photovoltaic module.Whole low pressure H bridge cascades
The current sensing means of topology photovoltaic system only includes a sampling resistor, described overcurrent protection signal and described can be obtained
The current signal of photovoltaic module;Decrease the sampling resistor quantity of half compared to existing technology, reduce the current sample of system
Cost.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, the accompanying drawing in describing below is only
It is embodiment of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, also
Other accompanying drawing can be obtained according to the accompanying drawing provided.
The current sensing means schematic diagram of a kind of low pressure H bridge cascaded topology photovoltaic system that Fig. 1 provides for prior art;
The current sensing means structure of a kind of low pressure H bridge cascaded topology photovoltaic system that Fig. 2 provides for the embodiment of the present application
Schematic diagram;
The electricity of the current sensing means of the low pressure H bridge cascaded topology photovoltaic system that Fig. 3 provides for another embodiment of the application
Road schematic diagram;
The current sensing means of the low pressure H bridge cascaded topology photovoltaic system that Fig. 4 provides for another embodiment of the application another
One structural representation;
The current sensing means of the low pressure H bridge cascaded topology photovoltaic system that Fig. 5 provides for another embodiment of the application another
One structural representation;
The current sensing means of the low pressure H bridge cascaded topology photovoltaic system that Fig. 6 provides for another embodiment of the application another
One circuit diagram;
The structural representation of the low pressure H bridge cascaded topology photovoltaic system that Fig. 7 provides for another embodiment of the application.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under making creative work premise
The every other embodiment obtained, broadly falls into the scope of this utility model protection.
This utility model provides the current sensing means of a kind of low pressure H bridge cascaded topology photovoltaic system, to reduce system
Current sample cost.
Concrete, the current sensing means of described low pressure H bridge cascaded topology photovoltaic system, as in figure 2 it is shown, include: sampling
Resistance R and filtering and amplifying circuit 101;Wherein:
Sampling resistor R is connected to a H bridge inverter unit of low pressure H bridge cascaded topology photovoltaic system and corresponding DC side
Between electric capacity;
Two inputs of filtering and amplifying circuit 101 two ends with sampling resistor R respectively are connected.
Concrete operation principle is:
Sampling resistor R, for the switching tube electric current of described H bridge inverter unit of sampling, generates voltage signal;
Sampling resistor R in Fig. 2, between H bridge inverter unit and DC bus capacitor, modulates plan based on known H bridge
Slightly, the electric current in sampling resistor R is equal to the switching tube electric current of H bridge inverter unit.Sampling resistor R is the electric current on switching tube
Signal is converted into voltage signal, but this voltage signal is the faintest, may be less than 10mV in the application that some are concrete.
Filtering and amplifying circuit 101 is for the filtering being amplified described voltage signal and more than half grid cycle, raw
Become overcurrent protection signal and the current signal of photovoltaic module.
Faint described voltage signal is amplified by the filtering and amplifying circuit 101 in Fig. 2, makes rear class for overcurrent protection
Device be capable of identify that.
Concrete, see the current sensing means of low pressure H bridge cascaded topology photovoltaic system as shown in Figure 2, i1 therein
For the switching tube electric current of H bridge inverter unit, i2 is DC bus capacitor electric current, and I3 is photovoltaic module electric current.
By Kirchhoff's current law (KCL):
I1=i2+I3 (1)
(1) formula is done the integration of half grid cycle, and wherein fl is mains frequency, obtains:
In half grid cycle, direct current surveys electric capacity to be needed to meet discharge and recharge balance, so that
Because I3 is photovoltaic module electric current, its ripple is the least, it is believed that be a constant DC quantity, (2) formula and
(3) during formula substitutes into (1) formula, then have:
From (4) formula, the switching tube electric current i1 of H bridge inverter unit is carried out the filtering of more than half grid cycle, just
Photovoltaic module electric current I3 can be obtained.
Therefore described voltage signal can be amplified and more than half grid cycle by filtering and amplifying circuit 101
Filtering, i.e. can get two current signals of current signal of described overcurrent protection signal and described photovoltaic module.
The current sensing means of the described low pressure H bridge cascaded topology photovoltaic system that the present embodiment provides, passes through said process
I.e. can obtain being respectively used to overcurrent protection and carrying out two current signals of MPPT, due to whole described low pressure H bridge cascaded topology
The current sensing means of photovoltaic system only includes a sampling resistor R, described overcurrent protection signal and described light can be obtained
The current signal of photovoltaic assembly;Decreasing the sampling resistor quantity of half compared to existing technology, the current sample reducing system becomes
This.
It addition, what deserves to be explained is, in prior art as shown in Figure 1, a H bridge inverter unit uses two sampling electricity
Resistance, its equivalent resistance is relatively big, can cause the biggest loss, reduce the efficiency of H bridge cascaded topology complete machine.And described in the present embodiment
The current sensing means of low pressure H bridge cascaded topology photovoltaic system, only include a sampling resistor, decrease compared to existing technology
While the sampling resistor quantity of half, it is to avoid bigger loss, improve the efficiency of H bridge cascaded topology complete machine.
In another specific embodiment of this utility model, on the basis of Fig. 2, concrete, as it is shown on figure 3, amplify filter
Wave circuit 101 includes: the first operational amplifier A MP1 and the second operational amplifier A MP2;
Two inputs of the first operational amplifier A MP1 two ends with sampling resistor R respectively are connected;
Two inputs of the second operational amplifier A MP2 two ends with sampling resistor R respectively are connected;
First operational amplifier A MP1, for being amplified described voltage signal, generates described overcurrent protection signal;The
Two operational amplifier A MP2, for the filtering being amplified described voltage signal and more than half grid cycle, generate described light
The current signal of photovoltaic assembly.
Preferably, after the first operational amplifier A MP1 is additionally operable to be amplified described voltage signal, then when carrying out presetting
Between filtering, just generate described overcurrent protection signal.
Voltage on sampling resistor R is done amplification computing by the first operational amplifier A MP1 in Fig. 3, it is possible to obtain described
Overcurrent protection signal (the switching tube current signal of MOSFET in the most described H bridge inverter unit).Further, the first operation amplifier herein
During parameter in device AMP1 is arranged, described Preset Time can be set according to specific circumstances, is not specifically limited herein;
Certain first operational amplifier A MP1 entirely without filtering also can, all in the protection domain of the application.
The overcurrent protection signal that first operational amplifier A MP1 produces can be given the comparator of rear class and produce protection signal,
Or be directly fed to MCU etc. do interruption protection process.It is not specifically limited, all in the protection domain of the application herein.
Voltage on sampling resistor R is done amplification computing by the second operational amplifier A MP2 in Fig. 3, and arranges big filtering
Time (more than half grid cycle), it is possible to obtain the current signal of described photovoltaic module.This current signal can be given low
The master controller of pressure H bridge cascaded topology photovoltaic system is MPPT and follows the tracks of.
Or, as shown in Figure 4, filtering and amplifying circuit 101 includes: amplifying circuit 111 and filter circuit 112;
Two inputs of amplifying circuit 111 two ends with sampling resistor R respectively are connected;
The input of filter circuit 112 is connected with the outfan of amplifying circuit 111;
Amplifying circuit 111, for being amplified described voltage signal, generates overcurrent protection signal;
Filter circuit 112, for described overcurrent protection signal carries out the filtering of more than half grid cycle, generates photovoltaic
The current signal of assembly.
In concrete actual application, filter circuit 112 can be digital filter circuit as shown in Figure 5 or such as Fig. 6
Shown active filter.
The current sensing means of the described low pressure H bridge cascaded topology photovoltaic system that the present embodiment provides, filtering part therein
Dividing can be single active power filtering (as shown in Figure 6), it is also possible to integrate (as shown in Figure 3) with amplifier section, or
By software filtering (as shown in Figure 5), but it is not necessarily limited to this, in concrete actual application, it is also possible to pass through
Other modes realize filtering accordingly, all in the protection domain of the application.
Another embodiment of this utility model additionally provides a kind of low pressure H bridge cascaded topology photovoltaic system, as Fig. 2 to Fig. 6 appoints
Shown in one, including: DC bus capacitor, H bridge inverter unit and the low pressure H bridge cascaded topology photovoltaic as described in above-described embodiment is arbitrary
The current sensing means of system;Wherein:
The input of the inverter of the two ends of described DC bus capacitor and described low pressure H bridge cascaded topology photovoltaic system and
The photovoltaic module of low pressure H bridge cascaded topology photovoltaic system is connected;
The current sensing means of described low pressure H bridge cascaded topology photovoltaic system is connected to described DC bus capacitor and described H
Between bridge inversion unit;
The outfan of the current sensing means of described low pressure H bridge cascaded topology photovoltaic system and described H bridge inverter unit
Control end to be connected with the master controller of described low pressure H bridge cascaded topology photovoltaic system.
The current signal of the corresponding photovoltaic module of the current sensing means output of described low pressure H bridge cascaded topology photovoltaic system
Can be input in described master controller, carry out MPPT tracking;Corresponding overcurrent protection signal can also be input to described master control
In device processed, do interruption protection and process to carry out corresponding overcurrent protection.
Wherein, the current sensing means of described low pressure H bridge cascaded topology photovoltaic system, as in figure 2 it is shown, include: sampling electricity
Resistance R and filtering and amplifying circuit 101;Wherein:
Sampling resistor R is connected to a H bridge inverter unit of low pressure H bridge cascaded topology photovoltaic system and corresponding DC side
Between electric capacity;
Two inputs of filtering and amplifying circuit 101 two ends with sampling resistor R respectively are connected;
On the basis of Fig. 2, concrete, as it is shown on figure 3, filtering and amplifying circuit 101 includes: the first operational amplifier
AMP1 and the second operational amplifier A MP2;
Two inputs of the first operational amplifier A MP1 two ends with sampling resistor R respectively are connected;
Two inputs of the second operational amplifier A MP2 two ends with sampling resistor R respectively are connected;
First operational amplifier A MP1, for being amplified described voltage signal, generates described overcurrent protection signal;The
Two operational amplifier A MP2, for the filtering being amplified described voltage signal and more than half grid cycle, generate described light
The current signal of photovoltaic assembly.
Preferably, after the first operational amplifier A MP1 is additionally operable to be amplified described voltage signal, then when carrying out presetting
Between filtering, just generate described overcurrent protection signal.
Or, as shown in Figure 4, filtering and amplifying circuit 101 includes: amplifying circuit 111 and filter circuit 112;
Two inputs of amplifying circuit 111 two ends with sampling resistor R respectively are connected;
The input of filter circuit 112 is connected with the outfan of amplifying circuit 111;
Amplifying circuit 111, for being amplified described voltage signal, generates overcurrent protection signal;
Filter circuit 112, for described overcurrent protection signal carries out the filtering of more than half grid cycle, generates photovoltaic
The current signal of assembly.
In concrete actual application, filter circuit 112 can be digital filter circuit as shown in Figure 5 or such as Fig. 6
Shown active filter.
Concrete operation principle is same as the previously described embodiments, repeats the most one by one.
Another embodiment of this utility model additionally provides a kind of low pressure H bridge cascaded topology photovoltaic system, as it is shown in fig. 7, bag
Include: n photovoltaic module, a main power filter (not showing in figure), a master controller (not showing in figure) and n as above
State the inverter 200 of low pressure H bridge cascaded topology photovoltaic system described in embodiment;N is the positive integer more than 1;Wherein:
The input of the inverter 200 of described n photovoltaic module and n low pressure H bridge cascaded topology photovoltaic system one a pair
Should be connected;
The outfan series connection of the inverter 200 of n low pressure H bridge cascaded topology photovoltaic system;The two ends of series connection are by described
Main power filter is connected with electrical network.
Concrete, the inverter 200 of each low pressure H bridge cascaded topology photovoltaic system includes: DC bus capacitor, H bridge inversion
Unit and as arbitrary in Fig. 2 to Fig. 6 shown in the current sensing means 100 of low pressure H bridge cascaded topology photovoltaic system.
The electric current letter of each photovoltaic module of current sensing means 100 output of n low pressure H bridge cascaded topology photovoltaic system
Number can all be input in described master controller, carry out MPPT tracking;Each overcurrent protection signal can also be input to described master
In controller, do interruption protection and process to carry out corresponding overcurrent protection.
Or, described low pressure H bridge cascaded topology photovoltaic system, also include: n the mistake receiving corresponding overcurrent protection signal
Stream protection circuit.
Each overcurrent protection signal can also be input in the comparator of rear class, realized stream with the control mode of hardware and protects
Protect.
In this utility model, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is and it
The difference of his embodiment, between each embodiment, identical similar portion sees mutually.
Below it is only preferred implementation of the present utility model, makes to skilled artisans appreciate that or realize this practicality
Novel.Multiple amendment to these embodiments will be apparent to one skilled in the art, defined herein
General Principle can realize in other embodiments in the case of without departing from spirit or scope of the present utility model.Therefore,
This utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and new
The widest scope that grain husk feature is consistent.
Claims (8)
1. the current sensing means of a low pressure H bridge cascaded topology photovoltaic system, it is characterised in that including:
The switching tube electric current of sampling H bridge inverter unit, generates the sampling resistor of voltage signal;Described sampling resistor is connected to low pressure
Between one H bridge inverter unit and the corresponding DC bus capacitor of H bridge cascaded topology photovoltaic system;
Described voltage signal is amplified and more than half grid cycle filtering, generates overcurrent protection signal and photovoltaic module
The filtering and amplifying circuit of current signal;Two inputs of described filtering and amplifying circuit respectively with the two ends of described sampling resistor
It is connected.
The current sensing means of low pressure H bridge cascaded topology photovoltaic system the most according to claim 1, it is characterised in that institute
State filtering and amplifying circuit to include:
Described voltage signal is amplified, generates the first operational amplifier of described overcurrent protection signal;Described first computing
Two inputs of amplifier two ends with described sampling resistor respectively are connected;
Described voltage signal is amplified and more than half grid cycle filtering, generates the current signal of described photovoltaic module
The second operational amplifier;Two inputs of described second operational amplifier two ends with described sampling resistor respectively are connected.
The current sensing means of low pressure H bridge cascaded topology photovoltaic system the most according to claim 2, it is characterised in that institute
State the first operational amplifier also for after described voltage signal is amplified, then carry out the filtering of Preset Time, just generate described in
The operational amplifier of overcurrent protection signal.
The current sensing means of low pressure H bridge cascaded topology photovoltaic system the most according to claim 1, it is characterised in that institute
State filtering and amplifying circuit to include:
Described voltage signal is amplified, generates the amplifying circuit of described overcurrent protection signal;Two of described amplifying circuit
Input two ends with described sampling resistor respectively are connected;
Described overcurrent protection signal is carried out the filtering of more than half grid cycle, generates the current signal of described photovoltaic module
Filter circuit;The input of described filter circuit is connected with the outfan of described amplifying circuit.
The current sensing means of low pressure H bridge cascaded topology photovoltaic system the most according to claim 4, it is characterised in that institute
Stating filter circuit is digital filter circuit or active filter.
6. the inverter of a low pressure H bridge cascaded topology photovoltaic system, it is characterised in that including: DC bus capacitor, H bridge inversion
Unit and the current sensing means of the low pressure H bridge cascaded topology photovoltaic system as described in claim 1 to 5 is arbitrary;Wherein:
The input of the inverter of the two ends of described DC bus capacitor and described low pressure H bridge cascaded topology photovoltaic system and low pressure
The photovoltaic module of H bridge cascaded topology photovoltaic system is connected;
It is inverse with described H bridge that the current sensing means of described low pressure H bridge cascaded topology photovoltaic system is connected to described DC bus capacitor
Become between unit;
The outfan of the current sensing means of described low pressure H bridge cascaded topology photovoltaic system and the control of described H bridge inverter unit
End is connected with the master controller of described low pressure H bridge cascaded topology photovoltaic system.
7. a low pressure H bridge cascaded topology photovoltaic system, it is characterised in that including: n photovoltaic module, a main power filter
The inverter of device, a master controller and n low pressure H bridge cascaded topology photovoltaic system as claimed in claim 6;N is more than 1
Positive integer;Wherein:
The input one_to_one corresponding phase of the inverter of described n photovoltaic module described low pressure H bridge cascaded topology photovoltaic system individual with n
Even;
The outfan series connection of the inverter of n described low pressure H bridge cascaded topology photovoltaic system;The two ends of series connection are by described main merit
Rate wave filter is connected with electrical network.
Low pressure H bridge cascaded topology photovoltaic system the most according to claim 7, it is characterised in that also include: n receives phase
The current foldback circuit of the overcurrent protection signal answered.
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CN110320396A (en) * | 2018-03-27 | 2019-10-11 | Ls产电株式会社 | Inverter peak current detection device |
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