CN108923528A - A kind of mine hoist emergency releases electric installation and its application method - Google Patents
A kind of mine hoist emergency releases electric installation and its application method Download PDFInfo
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- CN108923528A CN108923528A CN201810756572.0A CN201810756572A CN108923528A CN 108923528 A CN108923528 A CN 108923528A CN 201810756572 A CN201810756572 A CN 201810756572A CN 108923528 A CN108923528 A CN 108923528A
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- 238000009434 installation Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000005611 electricity Effects 0.000 claims abstract description 42
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 12
- 101000746134 Homo sapiens DNA endonuclease RBBP8 Proteins 0.000 claims description 3
- 101000969031 Homo sapiens Nuclear protein 1 Proteins 0.000 claims description 3
- 102100021133 Nuclear protein 1 Human genes 0.000 claims description 3
- 230000003139 buffering effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000013011 mating Effects 0.000 abstract description 2
- 238000004804 winding Methods 0.000 abstract description 2
- 238000005065 mining Methods 0.000 description 8
- 230000033001 locomotion Effects 0.000 description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 4
- 239000010931 gold Substances 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000013270 controlled release Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/08—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems requiring starting of a prime-mover
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Elevator Control (AREA)
Abstract
The invention discloses a kind of mine hoist emergency to release electric installation and its application method, solving under mains failure situation by there is technical issues that elevator when diesel-electric set electric supply, belonging to emergency and releasing electric installation technical field.The device includes core PLC arithmetic element, soft circuit of switch, rectification filtering circuit, electricity release module and power consumption module.The application method of the device is：It is coupled in parallel to chippy hoist voltage input end, the voltage change of dynamic monitoring herein is controlled by the stable state that voltage herein is completed in the setting to target control voltage threshold.Device provided by the invention, mine hoist operation is effectively ensured, it mating can be suitable for the alternating current-direct current transmission device of each transmission producer both at home and abroad extensively, the use of apparatus of the present invention, it can solve the problems, such as that the man winding under emergency condition is withdrawn with low-down loss, be of great significance for guaranteeing safe production.
Description
Technical field
The present invention relates to emergency release electric installation technical field more particularly to a kind of mine hoist emergency release electric installation and its
Application method.
Background technique
Metal mine enterprise mining mining method be broadly divided into it is outdoor and two kinds of underground mining, due to the particularity of gold mine,
Its strip mining transformation scale is extremely limited, and most of mining areas are underground mining, so a large amount of mine hoists are used for mine life
Produce enterprise.Mine hoisting is generally divided into main shaft and auxiliary shaft (a few cases are combined shaft), and main shaft is based on lifting ore, so right
The main hoist power of motor answered is larger, and auxiliary shaft generally carries goods and materials and the commuting transport of personnel, so auxiliary shaft
Emergency use become safety in production key factor.In order to guarantee the effective and safe operation of chippy hoist, adopt extensively at present
Use two kinds of technologies as its operational support：
One is the characteristic for the reciprocating motion that the transmission device in view of mine hoist loads, elevator transmission device is equal
Energy back measure is installed additional, the energy effective Feedback that mine hoist back and forth movement is generated in the process to power grid supplies
Power grid other electrical equipments consumption is lifted the hidden danger of DC voltage damage transmission device during customer service energy feedback, reaches
Energy-saving purpose；
Another kind is that alternating current powers off the influence to work chippy hoist in order to prevent,《Mine Electric Power design specification》In advise
The vertical shaft hoist of fixed frequent lifts personnel is Mine Electric Power first order load, thus vertical shaft winder system can all have two sets it is complete
Independent power supply, a set of normal mining area main power source (alternating current), a set of emergency diesel-oil power generation are used as backup power source.
The existing mode for ensureing that chippy hoist operates normally is to configure diesel generating set and installation energy back feed device,
Can make its efficient operation under the operating condition that alternating current operates normally, but under mains failure situation, diesel generating set due to
Capacity is limited, when carrying the energy of mine hoist feedback, will lead to the lifting of elevator entrance potential, so that elevator mistake
Pressure protection；It is exactly to increase the voltage that diesel-driven generator pool-size is lifted the energy of feedback transmission is not achieved there are also a kind of scheme
Unit protection threshold value, but this formula investing is excessively high.
Summary of the invention
The present invention is for by when diesel-electric set electric supply, there are the technologies of elevator overvoltage protection under mains failure situation
Problem provides a kind of mine hoist emergency and releases electric installation and its application method, passes through power electronic technique and chip controls
Technology realizes the safe and stable operation under any operating condition of chippy hoist, while emergency being overcome to release electric system band in mains-supplied
The harmonic current and reactive power impact problem come.
To achieve the goals above, the present invention provides the following technical solutions：
A kind of mine hoist emergency releases electric installation, including core PLC arithmetic element, switch soft circuit, rectifying and wave-filtering
Circuit, electricity release module and power consumption module, power grid three-phase alternating voltage enter soft circuit of the switch, this circuit is used
Carry out the electric power buffering when electric power access and original equipment starting of control device, then by the rectifier filter circuit by handing over
Galvanic electricity is rectified into direct current and is linked into electricity release module, and the electricity release module receives the control of PLC arithmetic element, is needing
PLC arithmetic element is sent to it switching pulse signal when electric discharge, and the IGBT inside electricity release module receives switching pulse
Signal is turned on and off, and DC voltage is discharged by the power consumption module.
Further, described soft circuit of switch includes inputting circuit breaker Q 1, main A.C. contactor KM1, supplementary AC to connect
Tentaculum KM2, current-limiting resistance R1 and current-limiting resistance R2, elevator power grid alternating current three phase mains are respectively connected to 1,3, the 5 of circuit breaker Q 1
Input terminal, 2,4,6 output terminals of Q1 are linked into the 1 of main A.C. contactor KM1,3,5 three input terminal, and then auxiliary is handed over
First and the third group contact for flowing contactor KM2 are connected to main A.C. contactor after series limiting resistor R1 and R2 respectively respectively again
Between the 1 of KM1 and 2,5 and 6 terminals.
Further, the rectifier filter circuit three-phase reactor L1 and rectifier bridge V1 switchs the output in soft circuit
End is respectively connected to the three-phase alternating current input terminal of rectifier bridge V1, the output positive and negative anodes difference of rectifier bridge V1 by three-phase reactor L1
It is connected to electricity release module.
Further, the electricity release module includes storage capacitor C1 and discharge cell U1, and rectifier filter circuit is defeated
Positive and negative anodes are respectively connected to positive and negative anodes X1, X2 of storage capacitor C1 out, and storage capacitor C1 is DC voltage link, storage capacitor C1's
Direct current it is positive and negative export be respectively connected to discharge cell U1 anode input DC+ and cathode input DC-, the output B1 of discharge cell U1,
B2 terminal accesses power consumption module and carries out direct-current discharge.
Further, the power consumption module is resistance R3.
Further, when discharge time is more frequent, the electric quantity consumption module replaces with the progress of electricity memory module
Electricity storage, when power grid normal electricity consumption again by inside electricity memory module electricity feedback to power grid carry out using.
Further, the electricity memory module is battery pack.
Further, the core PLC arithmetic element includes the power supply power supply terminal of DC+, GND；XX public terminal；The end X1
Son, for receiving system emergent stop signal；X2 terminal, for receiving reactor excess temperature fault-signal；X3 terminal, for receiving rectification
Device excess temperature fault-signal；X4 terminal and X5 terminal are separately connected and operate normally lamp and trouble light, for judging the operation shape of equipment
State；And YY and Y0 terminal, output pwm signal is transmitted to control terminal S1, S2 of electricity release module respectively.
Further, above-mentioned mine hoist emergency releases electric installation, and PLC arithmetic element passes through COM1 and external 7 cun of people
Machine interface HMI communication, for display and parameter setting.
Above-mentioned mine hoist emergency releases the application method of electric installation, specially：It is coupled in parallel to chippy hoist
Voltage input end, the voltage change of dynamic monitoring herein complete voltage herein by the setting to target control voltage threshold
Stable state control.
By sampling to three-phase voltage, and the comparison for analyzing itself and setting value is analyzed, and whether determining device carries out
Movement；It feeds back energy release channel and controlled release is carried out by exclusive PWM control mode, keep network voltage slowly varying
And it is constant in setting voltage range；Control system collection voltages are to voltage regulating command is issued, and the whole process speed of service is not
More than one second, the process status of voltage can be quickly adjusted very much, the safe operation for promoting machine equipment is effectively ensured.
Compared with prior art, beneficial effects of the present invention are：
Mine hoist emergency provided by the invention releases electric installation, is a kind of voltage-controlled complexes in scene, can
Threshold value setting is carried out to voltage, elevator entrance potential is higher than the threshold voltage of device setting, and there is special energy to release
Channel is put, the energy of feedback is discharged, so that the voltage is lower than the protection voltage of elevator transmission device, auxiliary shaft is maintained to mention
The normal safe operation of the machine of liter.When alternating current power-off occurs, in diesel-driven generator loading hoisting machine operational process, complexes energy
It is enough that rapidly input coefficient operation is risen according to voltage, mine hoist operation is effectively ensured；Can select with DC voltage
Or alternating voltage is control object, mating can be suitable for the alternating current-direct current transmission device of each transmission producer both at home and abroad extensively, fit
Ying Xingqiang；Mine hoist emergency provided by the invention releases the use of electric installation, and emergency shape can be solved with low-down loss
Problem is withdrawn in man winding under condition, is of great significance for making safety in production.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing do simple introduction.It should be evident that the accompanying drawings in the following description is only one embodiment of the present of invention, for this
For the technical staff in field, without creative efforts, it can also be obtained according to these attached drawings other accompanying drawings.
Fig. 1 is the functional block diagram that mine hoist emergency of the invention releases electric installation；
Fig. 2 is the key wiring diagram that mine hoist emergency of the invention releases electric installation.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, the technical solution of the embodiment of the present invention is carried out clearly and completely
Description, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole embodiments.Based on the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts,
Belong to protection scope of the present invention.
Shown in Figure 1, the present invention provides a kind of mine hoist emergency to release electric installation, including core PLC operation list
Member, soft circuit of switch, rectification filtering circuit, electricity release module and power consumption module, power grid three-phase alternating voltage enter
Soft circuit of the switch, this circuit are used to the electric power buffering when electric power access and original equipment starting of control device, then
It is linked into electricity release module for direct current by AC rectification by the rectifier filter circuit, the electricity release module connects
By the control of PLC arithmetic element, PLC arithmetic element is sent to it switching pulse signal, electricity release when needing to discharge
The IGBT of inside modules receives switching pulse signal and carries out switch and disjunction, and DC voltage is electricity by the power consumption module
Resistance is discharged.For special occasion, when discharge time is more frequent, it is contemplated that the waste of resistance consumption comparision of quantity of electricity, it can also
So that electricity consumption memory module, that is, battery pack is stored, again by the electricity feedback inside battery to electricity when power grid normal electricity consumption
Net carry out using.
Above-mentioned mine hoist emergency releases the application method of electric installation, specially：It is coupled in parallel to chippy hoist
Voltage input end, the voltage change of dynamic monitoring herein complete voltage herein by the setting to target control voltage threshold
Stable state control.
Shown in Figure 2, input circuit breaker Q 1 is incoming switch, forms soft circuit of switch with KM1, KM2, R1 and R2,
Elevator power grid alternating current three phase mains is respectively connected to 1,3,5 input terminals of circuit breaker Q 1, and 2,4,6 output terminals of Q1 are linked into
1,3,5 three input terminal of main A.C. contactor KM1, then the first of supplementary AC contactor KM2 and third group contact are divided
It is connected to respectively again after other series limiting resistor R1, R2 between 1 and 2,5 and 6 terminals of KM1.
Switch the i.e. KM1 of output in soft circuit 2,4,6 terminal of output terminal be respectively connected to by three-phase reactor L1 it is whole
The three-phase alternating current input terminal of bridge V1 is flowed, the output positive and negative anodes of rectifier bridge V1 are respectively connected to positive and negative anodes X1, X2 of storage capacitor C1.
Storage capacitor C1 is DC voltage link, and the positive negative output of direct current is respectively connected to the positive and negative anodes input of discharge cell U1
(DC+ and DC-), output B1, B2 terminal of discharge cell U1 meet corona discharge module R3 and carry out direct-current discharge.
When initial power supply state Q1 closes a floodgate, KM2 closure, electric current passes through R1, R2, L1 and rectifier bridge V1 to DC capacitor C1
Charging, when DC capacitor voltage is supplemented with money close to the voltage value of 10-50V (Ui × 1.4), major loop A.C. contactor KM1 closure,
Soft circuit KM2 of Simultaneous Switching is disconnected, and is powered from KM1 to device, this process is so effective that prevent high voltage from directly inputting system band
The dash current come damages equipment.
The PLC arithmetic element AP1 moment monitors elevator entrance three-phase voltage, and is compared with the voltage threshold of setting
Right, if elevator entrance potential is because when a variety of causes causes voltage to be raised to threshold voltage, PLC arithmetic element AP1 is issued
PWM wave begins through the resistance R3 release electricity of series connection with it after receiving PWM wave discharge signal to discharge cell U1, U1, directly
It is down at the threshold voltage of setting or less 5V to input voltage and stops electric discharge, it is again in the monitoring state.
The wherein PLC that PLC is DVP32EH00T3 using Delta company model provides 24V control by Switching Power Supply Z1
Electricity supplies power to its DC+, GND connecting terminal, and XX terminal is common end, and X1 terminal receives system emergent stop signal, and X2 terminal receives
Reactor excess temperature fault-signal, X3 terminal receive rectifier excess temperature fault-signal, X4 and X5 and connect normal running indicator and event respectively
Hinder lamp, for judging the operating status of equipment.Meanwhile in order to which the electric discharge calculated instruction is transported to discharge cell U1,
S1, S2 control terminal that YY, Y0 terminal output pwm signal are transmitted to discharge cell U1 are set.The reliability for considering sampling, is in addition adopted
With three expansion module DVP04AD, alternating voltage, alternating current, DC voltage and the DC current of sampling system are distinguished, then
It is communicated by COM1 and external 7 cun of Human machine interface, completes the operation and display of relevant parameter.
By sampling to three-phase voltage, and the comparison for analyzing itself and setting value is analyzed, and whether determining device carries out
Movement；It feeds back energy release channel and controlled release is carried out by exclusive PWM control mode, keep network voltage slowly varying
And it is constant in setting voltage range；Control system collection voltages are to voltage regulating command is issued, and the whole process speed of service is not
More than one second, the process status of voltage can be quickly adjusted very much, the safe operation for promoting machine equipment is effectively ensured.
In order to protect the operational safety of equipment, device devises humidity control system and mistake in scram button SB1 and system
Warm protection system, such as scheming EP1 and EP2 is efficient cooling blower, prevents apparatus overheat from shutting down.
Embodiment
Chinese gold industry group Henan Jin Yuan Gold Mining Industry Co., Ltd Qiyugou gold deposit mine chippy hoist runs power
265kW, generator 300kW, mains failure in emergency circumstances due to the reciprocating motion of elevator, generator outlet voltage fluctuation
Range is 450V~680V, and when entrance potential is greater than 650V, the drive apparatus of model 1P6RA7018-6DV62 is reported defeated once in a while
Enter over-voltage shutdown, needs artificial hand-reset that could operate normally again, after releasing electric system using emergency of the invention, will meet an urgent need
It releases electric threshold value and is set as 640V, for Network Voltage Stability between 450V~640V, transmission device is always maintained at stable operation.
It is above that certain exemplary embodiments of the invention are only described by way of explanation, undoubtedly, for ability
The those of ordinary skill in domain without departing from the spirit and scope of the present invention can be with a variety of different modes to institute
The embodiment of description is modified.Therefore, above-mentioned attached drawing and description are regarded as illustrative in nature, and should not be construed as to the present invention
The limitation of claims.
Claims (10)
1. a kind of mine hoist emergency releases electric installation, which is characterized in that including core PLC arithmetic element, soft circuit of switch,
Rectification filtering circuit, electricity release module and power consumption module, power grid three-phase alternating voltage enter soft circuit of the switch,
This circuit is used to the electric power buffering when electric power access and original equipment starting of control device, then passes through the rectifier filter
Circuit is that direct current is linked into electricity release module by AC rectification, and the electricity release module receives the control of PLC arithmetic element
System, PLC arithmetic element is sent to it switching pulse signal when needing to discharge, and the IGBT inside electricity release module is received
Switching pulse signal is turned on and off, and DC voltage is discharged by the power consumption module.
2. mine hoist emergency as described in claim 1 releases electric installation, which is characterized in that soft circuit of the switch includes
Input circuit breaker Q 1, main A.C. contactor KM1, supplementary AC contactor KM2, current-limiting resistance R1 and current-limiting resistance R2, elevator
Power grid alternating current three phase mains is respectively connected to 1,3,5 input terminals of circuit breaker Q 1, and 2,4,6 output terminals of Q1 are linked into main exchange
1,3,5 three input terminal of contactor KM1, then the first of supplementary AC contactor KM2 and third group contact are connected respectively
It is connected to respectively again after current-limiting resistance R1 and R2 between 1 and 2,5 and 6 terminals of main A.C. contactor KM1.
3. mine hoist emergency as described in claim 1 releases electric installation, which is characterized in that the rectifier filter circuit three
The output end of phase reactor L1 and rectifier bridge V1, soft circuit of switch are respectively connected to the three of rectifier bridge V1 by three-phase reactor L1
The output positive and negative anodes of phase AC input terminal, rectifier bridge V1 are respectively connected to electricity release module.
4. mine hoist as described in claim 1 emergency releases electric installation, which is characterized in that the electricity release module includes
Storage capacitor C1 and discharge cell U1, rectifier filter circuit output positive and negative anodes be respectively connected to storage capacitor C1 positive and negative anodes X1,
X2, storage capacitor C1 are DC voltage link, and the direct current of storage capacitor C1 is positive and negative to export the anode for being respectively connected to discharge cell U1
It inputs DC+ and cathode inputs DC-, output B1, B2 terminal access power consumption module of discharge cell U1 carries out direct-current discharge.
5. mine hoist emergency as described in claim 1 releases electric installation, which is characterized in that the power consumption module is electricity
Hinder R3.
6. mine hoist emergency as described in claim 1 releases electric installation, which is characterized in that when discharge time is more frequent
When, the electric quantity consumption module replaces with electricity memory module and carries out electricity storage, again deposits electricity when power grid normal electricity consumption
Storage module inside electricity feedback to power grid carry out using.
7. mine hoist emergency as claimed in claim 6 releases electric installation, which is characterized in that the electricity memory module is electricity
Pond group.
8. mine hoist emergency as described in claim 1 releases electric installation, which is characterized in that the core PLC arithmetic element
Power supply power supply terminal including DC+, GND；XX public terminal；X1 terminal, for receiving system emergent stop signal；X2 terminal, is used for
Receive reactor excess temperature fault-signal；X3 terminal, for receiving rectifier excess temperature fault-signal；X4 terminal and X5 terminal, respectively
Connection operates normally lamp and trouble light, for judging the operating status of equipment；And YY and Y0 terminal, difference output pwm signal
It is transmitted to control terminal S1, S2 of electricity release module.
9. mine hoist emergency as described in claim 1 releases electric installation, which is characterized in that PLC arithmetic element passes through COM1
It is communicated with external 7 cun of Human machine interface, for display and parameter setting.
10. the application method that mine hoist emergency as described in claim 1 releases electric installation, which is characterized in that be specially：It will
It is coupled in parallel to chippy hoist voltage input end, the voltage change of dynamic monitoring herein, by target control voltage threshold
The stable state control of voltage herein is completed in the setting of value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810756572.0A CN108923528B (en) | 2018-07-11 | Emergency electricity release device of mine hoist and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810756572.0A CN108923528B (en) | 2018-07-11 | Emergency electricity release device of mine hoist and application method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108923528A true CN108923528A (en) | 2018-11-30 |
| CN108923528B CN108923528B (en) | 2024-10-25 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080036431A1 (en) * | 2004-08-27 | 2008-02-14 | Robert Bosch Gmbh | Voltage Regulator Having Overvoltage Protection |
| CN101615861A (en) * | 2009-07-31 | 2009-12-30 | 东北大学 | A kind of high-frequency PWM commutation inversion integrated apparatus and control method thereof |
| CN101841292A (en) * | 2010-06-07 | 2010-09-22 | 苏州能健电气有限公司 | Direct-current motor driver of wind generating variable-propeller control system |
| CN103825470A (en) * | 2014-03-10 | 2014-05-28 | 台州富凌电气有限公司 | Four-quadrant frequency converter |
| CN208445347U (en) * | 2018-07-11 | 2019-01-29 | 长春黄金设计院有限公司 | A kind of mine hoist emergency releases electric installation |
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080036431A1 (en) * | 2004-08-27 | 2008-02-14 | Robert Bosch Gmbh | Voltage Regulator Having Overvoltage Protection |
| CN101615861A (en) * | 2009-07-31 | 2009-12-30 | 东北大学 | A kind of high-frequency PWM commutation inversion integrated apparatus and control method thereof |
| CN101841292A (en) * | 2010-06-07 | 2010-09-22 | 苏州能健电气有限公司 | Direct-current motor driver of wind generating variable-propeller control system |
| CN103825470A (en) * | 2014-03-10 | 2014-05-28 | 台州富凌电气有限公司 | Four-quadrant frequency converter |
| CN208445347U (en) * | 2018-07-11 | 2019-01-29 | 长春黄金设计院有限公司 | A kind of mine hoist emergency releases electric installation |
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