CN207706085U - A kind of electric machine controller - Google Patents
A kind of electric machine controller Download PDFInfo
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- CN207706085U CN207706085U CN201721901741.2U CN201721901741U CN207706085U CN 207706085 U CN207706085 U CN 207706085U CN 201721901741 U CN201721901741 U CN 201721901741U CN 207706085 U CN207706085 U CN 207706085U
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Abstract
The utility model discloses a kind of electric machine controllers.The electric machine controller includes：The input terminal of computing circuit inputs driving voltage preset value, for obtaining supply voltage preset value according to driving voltage preset value；The input terminal of sample circuit is electrically connected with the output end of power supply, is sampled for the voltage to power supply, and supply voltage information is obtained；The first input end of comparison circuit is electrically connected with the output end of computing circuit, and the second input terminal of comparison circuit is electrically connected with the output end of sample circuit, for according to supply voltage information and supply voltage preset value, obtaining voltage deviation；Control circuit is used for when the absolute value of voltage deviation is more than voltage deviation threshold value, the driving voltage of adjustment DC transfer circuit output.The utility model embodiment solves the problems, such as the prior art there are sample circuit and control methods that complicated, cost is higher, realizes simplified sample circuit and control method, reduces the effect of cost.
Description
Technical field
The utility model embodiment is related to automatic control technology field more particularly to a kind of electric machine controller.
Background technology
Motor is in welding machine and the technical fields such as automatically controls and is widely applied.Wherein, pass motor controlled
One of key technology is accurately controlled to motor speed.In the prior art, it in order to provide accurate voltage to motor, needs pair
The driving voltage for being input to motor side is sampled, to control the rotating speed of motor.However, sampling the drive of motor side
Dynamic voltage also includes the voltage signals such as the counter electromotive force generated when motor rotation, needs to handle the driving voltage, filter out
The influence of counter electromotive force.Therefore, there are sample circuits and control method complexity, the higher disadvantage of cost for the prior art.
Utility model content
The utility model provides a kind of electric machine controller, simplifies sample circuit and control method to realize, reduces cost
Effect.
The utility model embodiment provides a kind of electric machine controller, which includes：
DC transfer circuit, the output end of the DC transfer circuit are electrically connected with the input terminal of motor, are driven for exporting
Dynamic voltage；
The input terminal of computing circuit, the computing circuit inputs driving voltage preset value, for according to the driving voltage
Preset value obtains supply voltage preset value；
Power supply；
Sample circuit, the input terminal of the sample circuit are electrically connected with the output end of the power supply, for described
The voltage of power supply is sampled, and supply voltage information is obtained；
Comparison circuit, the first input end of the comparison circuit are electrically connected with the output end of the computing circuit, the ratio
The second input terminal compared with circuit is electrically connected with the output end of the sample circuit, for according to the supply voltage information and described
Supply voltage preset value obtains voltage deviation；
Control circuit, the first input end of the control circuit are electrically connected with the output end of the comparison circuit, the control
First output end of circuit processed is electrically connected with the control terminal of the DC transfer circuit, for the absolute value in the voltage deviation
When more than voltage deviation threshold value, the driving voltage of the DC transfer circuit output is adjusted.
Optionally, the DC transfer circuit includes：Buck circuit, the input terminal conduct of the buck circuit
The input terminal of the DC transfer circuit, the output of the output end of the buck circuit as the DC transfer circuit
End, the control terminal of the control terminal of the buck circuit as the DC transfer circuit；
The control circuit is additionally operable to adjust the duty ratio of the buck circuit.
Optionally, the comparison circuit includes：Subtracter, the first end of the subtracter and the first of the comparison circuit
Input terminal is electrically connected, and the second end of the subtracter is electrically connected with the second input terminal of the comparison circuit, is used for the electricity
Source information of voltage and the supply voltage preset value subtract each other.
Optionally, the electric machine controller further includes：Switching circuit；
The output end of the switching circuit is electrically connected with the second input terminal of the control circuit, for electric to the control
Road output starts information, and according to the startup information, obtains the driving voltage preset value.
The utility model inputs driving voltage preset value by the way that the input terminal of computing circuit is arranged, for according to driving voltage
Preset value obtains supply voltage preset value；The input terminal of sample circuit is electrically connected with the output end of power supply, for power supply
The voltage of power supply is sampled, and supply voltage information is obtained；The first input end of comparison circuit and the output end electricity of computing circuit
Connection, the second input terminal of comparison circuit are electrically connected with the output end of sample circuit, for according to supply voltage information and power supply
Voltage preset value obtains voltage deviation, solves the prior art there are sample circuit and control methods that complicated, cost is higher asks
Topic, realizes simplified sample circuit and control method, reduces the effect of cost.
Description of the drawings
Fig. 1 is a kind of flow chart of the control method for electric machine controller that the utility model embodiment one provides；
Fig. 2 is a kind of flow chart of the control method for electric machine controller that the utility model embodiment two provides；
Fig. 3 is a kind of flow chart of the control method for electric machine controller that the utility model embodiment three provides；
Fig. 4 is a kind of structural schematic diagram for electric machine controller that the utility model embodiment four provides；
Fig. 5 is a kind of structural schematic diagram for electric machine controller that the utility model embodiment five provides.
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, it illustrates only for ease of description, in attached drawing and the relevant part of the utility model rather than entire infrastructure.
Embodiment one
Fig. 1 is a kind of flow chart of the control method for electric machine controller that the utility model embodiment one provides, this implementation
Example is applicable to the rotating speed control of direct current generator.This method can also be held by computer program to execute by hardware circuit
Row.This method specifically comprises the following steps：
Step S110, supply voltage preset value is obtained according to the driving voltage preset value of DC transfer circuit output.
Wherein, driving voltage preset value is determined by the default operational factor of motor, for same motor, motor
Operating parameter and the driving voltage of motor be one-to-one relationship.If for example, the operating parameter of motor be rotating speed, motor
When driving voltage is 10V, the rotating speed of corresponding motor is 200r/min.Also, the driving voltage of motor is bigger, the rotating speed of motor
It is bigger.
DC transfer circuit includes chopper circuit, and chopper circuit is by changing pulse width by the fixed direct current of amplitude
Buckling changes the translation circuit of the variable DC voltage of amplitude size into.For example, supply voltage can be 24V, DC transfer circuit
The supply voltage of 24V can be down to 10V.In the present embodiment, supply voltage is transformed to motor operation by DC transfer circuit
Required driving voltage.So, the transformation relation between the driving voltage preset value and supply voltage preset value is become by direct current
The type and topological structure for changing circuit determine.
Supply voltage preset value provides the preset value of voltage for power supply.Power supply provides electric energy for motor operation.
Step S120, the voltage of power supply is sampled, obtains supply voltage information.
Wherein, supply voltage information refers to the information of the supply voltage size by sampling the power supply obtained output.
Step S130, according to supply voltage information and supply voltage preset value, voltage deviation is obtained.
Thus the voltage deviation obtained can characterize, the deviation of the driving voltage after DC transfer circuit converts, in turn
Whether the driving voltage that characterization motor actually obtains disclosure satisfy that the requirement of motor operation.
If step S140, the absolute value of voltage deviation is more than voltage deviation threshold value, the drive of adjustment DC transfer circuit output
Dynamic voltage.
Wherein, the absolute value of voltage deviation shows that more greatly the actual operation parameters in motor operation course are joined with default operation
Several deviations is bigger.In order to control the even running of motor, when the absolute value of the voltage deviation is more than voltage deviation threshold value, need
The driving voltage of motor is adjusted, keep the driving voltage of motor equal with voltage preset value.Specifically, new in this practicality
In type embodiment, the driving voltage of output can be adjusted by being controlled to DC transfer circuit.For example, when supply voltage
When initial value is 24V, the driving voltage of DC transfer circuit output is 10V.When supply voltage decline, when being down to 23V by 24V,
The supply voltage information that sampling circuit samples obtain is 23V, then, it is possible thereby to determine the driving electricity of DC transfer circuit output
Pressure will correspondingly reduce.The present embodiment can make the driving voltage of output remain 10V by adjusting DC transfer circuit, from
And motor speed is made to stablize.
The technical solution of the present embodiment, by the operational process of motor, sampling, obtaining to the voltage of power supply
Supply voltage information is taken, the driving voltage information then exported according to the supply voltage acquisition of information DC transfer circuit solves
The prior art there are sample circuits and control method complicated, cost higher disadvantage.In electric machine controller, supply voltage phase
It is metastable for driving voltage.The technical solution of the present embodiment actually samples supply voltage, and
It is sampled without the driving voltage to motor, because of the shadow of the driving voltage obtained to sampling without regard to counter electromotive force of motor
It rings.In this way, on the one hand simplifying sample circuit without being sampled to parameters such as the electric currents of motor；On the other hand, in controlling party
In method, without the size for calculating the counter electromotive force that motor generates, control method is simplified.To sum up, the technical side of the present embodiment
Case has reached simplified sample circuit and control method, reduces the effect of cost.
Optionally, which can be zero, that is, as long as the supply voltage of motor and supply voltage preset value are not
It is equal, just DC transfer circuit is adjusted.Show at this point, voltage deviation is zero for example, supply voltage preset value is 24V
The driving voltage of DC transfer circuit output is 10V, and motor speed is stablized, without being adjusted to DC transfer circuit.If voltage
Deviation is -1V, i.e. supply voltage is 23V, shows that supply voltage is then answered less than 24V in order to ensure the stabilization of speed of motor at this time
The driving voltage of adjustment DC transfer circuit output.
With continued reference to Fig. 1, optionally, step S130 further includes：Step S131, supply voltage information and supply voltage are default
Value is subtracted each other, and voltage deviation is obtained.It is poor by making supply voltage information and supply voltage preset value, it can intuitively obtain power supply
The deviation size of the voltage of power supply output.
In above-mentioned each technical solution, supply voltage information can also be sampled voltage information, supply voltage preset value
It can be a reference value of sample circuit.For example, set supply voltage preset value as 2V (i.e. a reference value of sample circuit is 2V), it is right
The supply voltage answered is 24V.If supply voltage information is 2V, at this point, voltage deviation is zero, show that power supply is stablized, i.e., it is electric
Machine stabilization of speed, without being adjusted to DC transfer circuit.If supply voltage information is 1.85V, i.e., voltage deviation is -0.15V,
Show that supply voltage is less than 24V at this time, then should adjust DC transfer circuit, to keep motor speed to stablize.
Embodiment two
Fig. 2 is a kind of flow chart of the control method for electric machine controller that the utility model embodiment two provides.Above-mentioned
On the basis of embodiment, specifically, step S140 further includes：Step S141, the duty cycle information of adjustment DC transfer circuit obtains
Take driving voltage information.
DC transfer circuit can be made of controllable power electronic devices.Power electronic devices is also known as power semiconductor
Device is mainly used for the transformation of electrical energy and the powerful electronic device of control circuit aspect of power equipment.Power electronic devices
Type has half control type device (for example, thyristor), wholly-controled device (for example, gate level turn-off thyristor, power transistor, electricity
Field of force effect transistor, igbt) and uncontrollable device (for example, Power Diode Pumped).If the DC converting is electric
It route half control type device or wholly-controled device is constituted, which may be used the drive of pulse width modulation mode control output
The size of dynamic voltage, can specifically control the duty ratio of DC transfer circuit.Thus, it is possible to pass through supply voltage information and control
The size of the Duty ratio control driving voltage of the DC transfer circuit.
The technical solution of the present embodiment, by the operational process of motor, sampling, obtaining to the voltage of power supply
Supply voltage information is taken, the duty ratio of DC transfer circuit is then controlled according to voltage deviation, to control DC transfer circuit
The driving voltage of output solves the prior art there are sample circuit and control method complexity, the higher disadvantage of cost, reaches
Sample circuit and control method are simplified, the effect of cost is reduced.
Specifically, the driving voltage of adjustment DC transfer circuit output includes：If the absolute value of voltage deviation is more than voltage
Deviation threshold, and voltage deviation is more than zero, reduces duty cycle information；If the absolute value of voltage deviation is more than voltage deviation threshold value,
And voltage deviation is less than zero, increases duty cycle information.When voltage deviation is more than zero, the duty ratio for reducing DC transfer circuit can
To reduce the driving voltage of its output, the size of driving voltage and voltage preset value is made to reach unanimity.Similarly, when voltage deviation is small
When zero, the driving voltage of its output can be increased by increasing the duty ratio of DC transfer circuit, make the size and electricity of driving voltage
Pressure preset value reaches unanimity.For example, supply voltage is 24V, the preset rotation speed of motor is 200r/min, and DC transfer circuit corresponds to
Duty ratio be 45%.When supply voltage reduces by 10%, supply voltage is reduced to 21.6V, and voltage deviation is -2.4V.It keeps
The preset rotation speed of motor needs the duty ratio of DC transfer circuit being increased to 50% (45%/90%=50%), to make drive
Dynamic voltage keeps 10V, motor speed to stablize.
Embodiment three
Fig. 3 is a kind of flow chart of the control method for electric machine controller that the utility model embodiment three provides.Referring to figure
3, on the basis of the various embodiments described above, further include after step s 130：
If step S142, the absolute value of voltage deviation is less than or equal to voltage deviation threshold value, DC transfer circuit output
Driving voltage remains unchanged.
Wherein, step S142 and step S140 is two steps arranged side by side, and the size according to the absolute value of voltage deviation is true
Surely step S142 or step S140 is executed.When the absolute value of voltage deviation be less than or equal to voltage deviation threshold value when, without pair
The operating parameter of motor is adjusted.Because without being adjusted to DC transfer circuit, keeping the current operating conditions of motor.
Optionally, voltage deviation threshold value is set as zero.So, when voltage deviation is zero, without adjusting DC transfer circuit output
Driving voltage, motor keep current operating conditions.When voltage deviation is not zero, the driving electricity of adjustment DC transfer circuit output
Pressure, makes motor stabilizing run.
The technical solution of the present embodiment, by the operational process of motor, sampling, obtaining to the voltage of power supply
Supply voltage information is taken, then adjusting the direct current according to the voltage deviation of the supply voltage information and supply voltage preset value becomes
The driving voltage for changing circuit output solves the prior art there are sample circuit and control methods complicated, the higher disadvantage of cost,
Reach and simplified sample circuit and control method, has reduced the effect of cost.
On the basis of above-mentioned each technical solution, step S110, according to DC transfer circuit export driving voltage it is pre-
Before if value obtains supply voltage preset value, further include：
Step S100, it detects that switching circuit is connected, obtains and start information.
Wherein, which can be the preset rotation speed of motor operation.After switching circuit is connected, power supply electricity can be controlled
Source powers to DC transfer circuit, and driving motor operation is provided with the clean boot conducive to motor in this way.
Step S101, according to information is started, driving voltage preset value is obtained.
When the startup information is the preset rotation speed of motor operation, since the rotating speed of motor and the driving voltage of motor are one
Therefore one-to-one correspondence can determine driving voltage preset value by preset rotation speed information, accurate control is provided for subsequent step
Information processed.
Example IV
Fig. 4 is a kind of structural schematic diagram for electric machine controller that the utility model embodiment four provides, and the present embodiment can be held
The motor control method that row the various embodiments described above are provided.The electric machine controller includes：DC transfer circuit 230, computing circuit
240, power supply 210, sample circuit 220, comparison circuit 250 and control circuit 260.
The output end 232 of DC transfer circuit 230 is electrically connected with the input terminal of motor 270, is used for outputting drive voltage；Fortune
The input terminal 241 for calculating circuit 240 is electrically connected with the second output terminal 264 of control circuit 260, default for inputting driving voltage
Value, and supply voltage preset value is obtained according to driving voltage preset value；Power supply 210；The input terminal of sample circuit 220
221 are electrically connected with the output end 212 of power supply 210, are sampled for the voltage to power supply 210, obtain power supply electricity
Press information；The first input end 251 of comparison circuit 250 is electrically connected with the output end 242 of computing circuit 240, comparison circuit 250
Second input terminal 253 is electrically connected with the output end 222 of sample circuit 220, for pre- according to supply voltage information and supply voltage
If value obtains voltage deviation；The first input end 261 of control circuit 260 is electrically connected with the output end 252 of comparison circuit 250, control
First output end 262 of circuit 260 processed is electrically connected with the control terminal 233 of DC transfer circuit 230, in the exhausted of voltage deviation
When being more than voltage deviation threshold value to value, the driving voltage of the adjustment output of DC transfer circuit 230.
The technical solution of the present embodiment, the input terminal 241 by the way that computing circuit 240 is arranged input driving voltage preset value,
For obtaining supply voltage preset value according to driving voltage preset value；The input terminal 221 of sample circuit 220 and power supply 210
Output end 212 be electrically connected, sampled for the voltage to power supply 210, obtain supply voltage information；Comparison circuit
250 first input end 251 is electrically connected with the output end 242 of computing circuit 240, the second input terminal 253 of comparison circuit 250 with
The output end 222 of sample circuit 220 is electrically connected, for according to driving voltage supply voltage information and supply voltage preset value, obtaining
Voltage deviation is taken, solving the prior art, there are sample circuits and control method complexity, the higher disadvantage of cost.The present embodiment
Technical solution is actually that sample circuit samples supply voltage, is sampled without the driving voltage to motor 270,
Because of the influence of the driving voltage obtained to sampling without regard to 270 counter electromotive force of motor.In this way, on the one hand without to motor
The parameters such as 270 electric current are sampled, and sample circuit is simplified；On the other hand, in control method, without calculating motor
The size of 270 counter electromotive force generated, simplifies control method.To sum up, the technical solution of the present embodiment has reached simplified sampling
Circuit and control method reduce the effect of cost.
With continued reference to Fig. 4, on the basis of above-mentioned each technical solution, the comparison circuit 250 of the electric machine controller can wrap
It includes：Subtracter, the first end of subtracter are electrically connected with the first input end 251 of comparison circuit 250, the second end of subtracter with than
The second input terminal 253 compared with circuit 250 is electrically connected, for subtracting each other supply voltage information and supply voltage preset value.
On the basis of above-mentioned each technical solution, which includes：Buck circuit, buck chopper
Input terminal 231 of the input terminal of circuit as DC transfer circuit 230, the output end of buck circuit is as DC converting electricity
The output end 232 on road 230, the control terminal 233 of the control terminal of buck circuit as DC transfer circuit 230；Control circuit
260 are additionally operable to the duty cycle information of adjustment buck circuit.
Wherein, buck circuit refers to that the average value of output voltage is less than the value of input voltage, that is, the driving electricity exported
The value of pressure is less than the value of supply voltage.
Embodiment five
Fig. 5 is a kind of structural schematic diagram for electric machine controller that the utility model embodiment five provides, and the present embodiment can be held
The motor control method that one~embodiment of row above-described embodiment three is provided.On the basis of example IV, the electric machine controller
Further include：Switching circuit 280；The output end 282 of the switching circuit 280 and the second input terminal 263 of control circuit 260 are electrically connected
It connects, starts information for being exported to control circuit 260, and according to the startup information, obtain the driving voltage preset value.
The technical solution of the present embodiment, by the way that computing circuit 240, the input driving of input terminal 241 of computing circuit 240 is arranged
Voltage preset value, for obtaining supply voltage preset value according to driving voltage preset value；The input terminal 221 of sample circuit 220 with
The output end 212 of power supply 210 is electrically connected, and is sampled for the voltage to power supply 210, and supply voltage letter is obtained
Breath；The first input end 251 of comparison circuit 250 is electrically connected with the output end 242 of computing circuit 240, and the second of comparison circuit 250
Input terminal 253 is electrically connected the first preset value of input with the output end 212 of sample circuit 220, for according to driving voltage power supply electricity
Press information and supply voltage preset value, obtain voltage deviation, solve the prior art there are sample circuits and control method it is complicated,
The higher disadvantage of cost.The technical solution of the present embodiment is actually that sample circuit samples supply voltage, without right
The driving voltage of motor 270 is sampled, because of the shadow of the driving voltage obtained to sampling without regard to 270 counter electromotive force of motor
It rings.In this way, on the one hand simplifying sample circuit without being sampled to parameters such as the electric currents of motor 270；On the other hand, it is controlling
In method processed, without the size for calculating the counter electromotive force that motor 270 generates, control method is simplified.To sum up, the present embodiment
Technical solution has reached simplified sample circuit and control method, reduces the effect of cost.In addition, after switching circuit is connected, it can be with
It controls power supply to power to DC transfer circuit, driving motor operation is provided with the clean boot conducive to motor in this way.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, can carry out for a person skilled in the art various bright
Aobvious variation is readjusted and is substituted without departing from the scope of protection of the utility model.Therefore, although passing through above example
The utility model is described in further detail, but the utility model is not limited only to above example, is not departing from
Can also include other more equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Right determine.
Claims (4)
1. a kind of electric machine controller, which is characterized in that including：
DC transfer circuit, the output end of the DC transfer circuit are electrically connected with the input terminal of motor, for output driving electricity
Pressure；
The input terminal of computing circuit, the computing circuit inputs driving voltage preset value, for default according to the driving voltage
Value obtains supply voltage preset value；
Power supply；
Sample circuit, the input terminal of the sample circuit are electrically connected with the output end of the power supply, for the power supply
The voltage of power supply is sampled, and supply voltage information is obtained；
Comparison circuit, the first input end of the comparison circuit are electrically connected with the output end of the computing circuit, and the comparison is electric
Second input terminal on road is electrically connected with the output end of the sample circuit, for according to the supply voltage information and the power supply
Voltage preset value obtains voltage deviation；
Control circuit, the first input end of the control circuit are electrically connected with the output end of the comparison circuit, the control electricity
First output end on road is electrically connected with the control terminal of the DC transfer circuit, for being more than in the absolute value of the voltage deviation
When voltage deviation threshold value, the driving voltage of the DC transfer circuit output is adjusted.
2. electric machine controller according to claim 1, which is characterized in that the DC transfer circuit includes：Buck chopper
Circuit, the input terminal of the input terminal of the buck circuit as the DC transfer circuit, the buck circuit
Output end of the output end as the DC transfer circuit, the control terminal of the buck circuit is as DC converting electricity
The control terminal on road；
The control circuit is additionally operable to adjust the duty ratio of the buck circuit.
3. electric machine controller according to claim 1, which is characterized in that the comparison circuit includes：Subtracter, it is described to subtract
The first end of musical instruments used in a Buddhist or Taoist mass is electrically connected with the first input end of the comparison circuit, the second end of the subtracter and the comparison circuit
The second input terminal electrical connection, for the supply voltage information and the supply voltage preset value to be subtracted each other.
4. electric machine controller according to claim 1, which is characterized in that further include：Switching circuit；
The output end of the switching circuit is electrically connected to the control circuit, and starts information for being exported to the control circuit,
And according to the startup information, obtain the driving voltage preset value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721901741.2U CN207706085U (en) | 2017-12-29 | 2017-12-29 | A kind of electric machine controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721901741.2U CN207706085U (en) | 2017-12-29 | 2017-12-29 | A kind of electric machine controller |
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| Publication Number | Publication Date |
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| CN207706085U true CN207706085U (en) | 2018-08-07 |
Family
ID=63030298
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108075699A (en) * | 2017-12-29 | 2018-05-25 | 上海沪工焊接集团股份有限公司 | A kind of motor control method and electric machine controller |
-
2017
- 2017-12-29 CN CN201721901741.2U patent/CN207706085U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108075699A (en) * | 2017-12-29 | 2018-05-25 | 上海沪工焊接集团股份有限公司 | A kind of motor control method and electric machine controller |
| CN108075699B (en) * | 2017-12-29 | 2024-02-20 | 上海沪工焊接集团股份有限公司 | Motor control method and motor controller |
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Effective date of registration: 20200707 Address after: Room 301-305, building 1, 3883 Yuanjiang Road, Minhang District, Shanghai 201100 Patentee after: Shanghai Huhang Satellite Technology Co., Ltd Address before: No. 7177, pine road outside Qingpu District, Shanghai City, Shanghai Patentee before: SHANGHAI HUGONG ELECTRIC (Group) Co.,Ltd. |
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