CN207652318U - A kind of elevator frequency conversion equipment - Google Patents
A kind of elevator frequency conversion equipment Download PDFInfo
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- CN207652318U CN207652318U CN201721381907.2U CN201721381907U CN207652318U CN 207652318 U CN207652318 U CN 207652318U CN 201721381907 U CN201721381907 U CN 201721381907U CN 207652318 U CN207652318 U CN 207652318U
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- frequency converter
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- bipolar transistor
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Abstract
The utility model discloses a kind of elevator frequency conversion equipments comprising：One converter plant comprising multiple switch element and multiple insulated gate bipolar transistors, the converter plant is for driving an elevator host；One current detector, it is connected with the converter plant and the elevator host respectively, the current detector includes input side current detector and outlet side current detector, the current detector is used to monitor in real time the input side electric current and outlet side electric current of the converter plant, when the converter plant breaks down, fault-signal is sent to a microcomputer by the current detector in real time；The microcomputer is connected with the converter plant and the current detector respectively, working condition of the microcomputer for the converter plant detected by the current detector carries out logical operation and judgement, and corresponding control instruction is sent to the converter plant, and then control the switch element and insulated gate bipolar transistor on or off of the converter plant.
Description
Technical field
The utility model is related to elevator control technology fields, are a kind of elevator frequency conversion equipments specifically.
Background technology
In elevator device, converter plant is used to control the operating of elevator host, to drive the operation up and down of car, because
This, converter plant is very important component part in elevator device.Currently, break down in converter plant (such as IGBT damages
Bad or short circuit) when, it is controlled by microcomputer so that elevator carries out emergency stop, but microcomputer will not attempt automatic analysis and judgment failure original
Cause, and make further operation measures (such as continuing low speed operation or the passenger of flat bed release nearby).It may result in change in this way
The working efficiency and reliability of frequency device substantially reduce, and stranded passenger can only wait for maintenance personnel to rescue, and cause to multiply
The psychology of visitor is panic.
In view of this, it is urgent to provide a kind of novel elevator frequency conversion equipments.
Utility model content
The purpose of the utility model is to provide a kind of elevator frequency conversion equipments, can be in elevator frequency conversion equipment
Converter plant break down, and after elevator emergency stop, described device is made corresponding operation by the logic judgment of microcomputer and is arranged
It applies, to greatly improve the reliability and operational efficiency of elevator frequency conversion equipment.
To achieve the above object, the utility model uses following technical scheme.
The utility model provides a kind of elevator frequency conversion equipment, including：One converter plant, the converter plant include multiple
Switch element and multiple insulated gate bipolar transistors, the converter plant is for driving an elevator host；One current detector,
The current detector is connected with the converter plant and the elevator host respectively, and the current detector includes input side electricity
Current sensor and outlet side current detector, the current detector are used to monitor in real time the input side electric current of the converter plant
With outlet side electric current, when the converter plant breaks down, fault-signal is sent to one by the current detector in real time
Microcomputer；The microcomputer is connected with the converter plant and the current detector respectively, and the microcomputer is used for according to the electric current
The working condition of converter plant detected by detector carries out logical operation and judgement, and sends corresponding control instruction to institute
Converter plant is stated, and then controls the switch element and insulated gate bipolar transistor on or off of the converter plant.
In an embodiment of the utility model, the microcomputer includes：One communication unit, a logical operation process unit,
One control unit and an I/O interface unit；Wherein, the communication unit is connected with the current detector, and the communication unit is used
In the working condition of the converter plant is sent to the logical operation process unit；The logical operation process unit and institute
It states control unit to be connected, the logical operation process unit is used for the working condition according to the converter plant and patrols based on one
It collects algorithm and obtains corresponding control instruction；Described control unit respectively with the I/O interface unit and the converter plant
Insulated gate bipolar transistor be connected, described control unit is used to according to the control instruction drive the insulated gate bipolar
The on or off of transistor npn npn；The I/O interface unit is connected with the switch element of the converter plant, the I/O interface list
Member is disconnected for when the converter plant breaks down, controlling corresponding switch element.
In an embodiment of the utility model, the microcomputer further includes：One storage unit, the storage unit respectively with
The logical operation process unit is connected with described control unit, and the storage unit is for storing the logical operation process list
Member generated data when carrying out logical operation and judging, and handling result is sent to described control unit.
In an embodiment of the utility model, the multiple switch element is contactor, and each switch element is used
In the on or off for controlling each insulated gate bipolar transistor circuit.
In an embodiment of the utility model, the converter plant further comprises that input side frequency converter and outlet side become
Frequency device；Input side frequency converter is separated by one first bus capacitor with outlet side frequency converter；The input side frequency converter is by first
Three-phase alternating current is rectified into high voltage direct current and is stored in first bus capacitor；The outlet side frequency converter reception comes from
The power supply of first bus capacitor, and by the second three-phase alternating current to drive elevator host.
In an embodiment of the utility model, the input side frequency converter includes first group of frequency converter and second group of frequency conversion
Device, first group of frequency converter and second group of frequency converter are including N to frequency converter, the multiple that wherein N is 3, per a pair of change
Frequency device includes identical first branch path of structure and the second branch path；First branch path and the second branch path include successively
The first switching element of setting, the first insulated gate bipolar transistor and second switch element, wherein the first switching element,
Second switch element is one kind of the switch element, and the first insulated gate bipolar transistor is the insulated gate bipolar crystal
One kind of pipe；The outlet side frequency converter includes third group frequency converter and the 4th group of frequency converter, the third group frequency converter and
For four groups of frequency converters including N to frequency converter, the multiple that wherein N is 3 includes that structure is first point identical per a pair of frequency converter
Branch and the second branch path；First branch path and the second branch path include the first switching element set gradually, first
Insulated gate bipolar transistor and second switch element, wherein the first switching element, second switch element are the switch
One kind of element, the first insulated gate bipolar transistor are one kind of the insulated gate bipolar transistor.
In an embodiment of the utility model, the converter plant further comprises identical and in parallel defeated of two structures
Enter side frequency converter and outlet side frequency converter；Each input side frequency converter passes through one first bus capacitor and outlet side frequency converter
It separates；Each input side frequency converter is connected to the first three-phase alternating current by first switching element, and by the described 1st
Phase alternating current is rectified into high voltage direct current and is stored in first bus capacitor；Each outlet side frequency converter, which receives, to be come
The second three-phase alternating current is connected to drive elevator master from the power supply of first bus capacitor, and by second switch element
Machine.
In an embodiment of the utility model, each input side frequency converter includes first group of frequency converter and second group
Frequency converter, first group of frequency converter and second group of frequency converter are including N to frequency converter, the multiple that wherein N is 3, per a pair of institute
It includes identical first branch path of structure and the second branch path to state frequency converter；First branch path and the second branch path include
First insulated gate bipolar transistor, wherein the first insulated gate bipolar transistor is the one of the insulated gate bipolar transistor
Kind；Each outlet side frequency converter includes third group frequency converter and the 4th group of frequency converter, the third group frequency converter and the 4th
For group frequency converter including N to frequency converter, the multiple that wherein N is 3 includes identical first branch of structure per a pair of frequency converter
Road and the second branch path；First branch path and the second branch path include the first insulated gate bipolar transistor；Wherein institute
State first switching element, one kind that second switch element is the switch element, the first insulated gate bipolar transistor is described
One kind of insulated gate bipolar transistor.
In an embodiment of the utility model, the current detector is current sensor.
The utility model has the advantage of in converter plant event can occur for elevator frequency conversion equipment described in the utility model
Barrier, and after elevator emergency stop, described device is made accordingly under the premise that security is guaranteed by the logical operation and judgement of microcomputer
Operation measures, to greatly improve the reliability and operational efficiency of described device.
Description of the drawings
Fig. 1 is the configuration diagram of the elevator frequency conversion equipment in one embodiment of the utility model；
Fig. 2 is the circuit connection of the converter plant in the elevator frequency conversion equipment in embodiment described in the utility model
Schematic diagram；
Fig. 3 is the circuit connection of the converter plant in the elevator frequency conversion equipment in another embodiment of the utility model
Schematic diagram.
Specific implementation mode
It elaborates below in conjunction with the accompanying drawings to the specific implementation mode of elevator provided by the utility model frequency conversion equipment.
Shown in Figure 1, the utility model provides a kind of elevator frequency conversion equipment, including：One converter plant, 120, one electricity
Current sensor 130 and a microcomputer 110.
Wherein, the converter plant 120 include multiple switch element 121 and multiple insulated gate bipolar transistors 122 (i.e.
IGBT), the company of switch element 121 and insulated gate bipolar transistor 122 will be further illustrated in two embodiments below
Connect relationship.The converter plant 120 is for driving an elevator host 140.
The current detector 130 is connected with the converter plant 120 and the elevator host 140 respectively, the electric current
Detector 130 includes input side current detector 131 and outlet side current detector 132.In embodiment described in the utility model
In, the current detector 130 is current sensor.The current detector 130 is for monitoring the converter plant 120 in real time
Input side electric current and outlet side electric current.When the converter plant 120 breaks down, the current detector 130 is by failure
Signal is sent to the microcomputer 110 in real time.In the present embodiment, input side electric current refers to that three-phase (R, S, T-phase in Fig. 2) is defeated
Enter electric current, outlet side electric current refers to three-phase (U, V, W phase in Fig. 2) output current.
The microcomputer 110 is connected with the converter plant 120 and the current detector 130 respectively, and the microcomputer 110 is used
Logical operation and judgement are carried out in the working condition of the converter plant 120 detected by the current detector 130, concurrently
It send corresponding control instruction to the converter plant 120, and then controls switch element 121 and the insulation of the converter plant 120
122 on or off of grid bipolar transistor.
With continued reference to Fig. 1, in the embodiment of the utility model, the microcomputer 110 includes：One communication unit 111,
One logical operation process unit 112, a control unit 113 and an I/O interface unit 114.Wherein, the communication unit 111 and institute
It states current detector 130 to be connected, the communication unit 111 is used to the working condition of the converter plant 120 being sent to described
Logical operation process unit 112；The logical operation process unit 112 is connected with described control unit 113, the logical operation
Processing unit 112 is used for the working condition according to the converter plant 120 and is obtained based on a logical operation rule corresponding
Control instruction；Described control unit 113 is double with the insulated gate of the I/O interface unit 114 and the converter plant 120 respectively
Bipolar transistor 122 is connected, and described control unit 113 according to the control instruction for driving the insulated gate bipolar brilliant
The on or off of body pipe 122；The I/O interface unit 114 is connected with the switch element 121 of the converter plant 120, described
I/O interface unit 114 is used for when the converter plant 120 breaks down, and controls the disconnection of corresponding switch element 121.
Optionally, the microcomputer 110 further includes：One storage unit 115, the storage unit 115 respectively with the logic
Operation processing unit 112 is connected with described control unit 113, and the storage unit 115 is for storing the logical operation process
The generated data when carrying out logical operation and judging of unit 112, and handling result is sent to described control unit
113。
In addition, in the embodiment of the utility model, the multiple switch element 121 is contactor, the contact
Device includes main contacts and auxiliary contact.The main contacts of each switch element 121 is for controlling each insulated gate bipolar
The on or off in 122 circuit of transistor npn npn.
Shown in Figure 2, in the embodiment of the utility model, the converter plant 120 further comprises that one is defeated
Enter side frequency converter (not identified in figure) and an outlet side frequency converter (not identified in figure).The input side frequency converter passes through one first
Bus capacitor (not identified in figure) is separated with the outlet side frequency converter；The input side frequency converter is by the first three-phase alternating current
(being herein R, S, T three-phase alternating current from power grid) is rectified into high voltage direct current and is stored in first bus capacitor；
At the same time the outlet side frequency converter receives the power supply from first bus capacitor, and passes through the second three-phase alternating current
To drive elevator host 140.
Wherein, the input side frequency converter include first group of frequency converter 123 and second group of frequency converter 124, described first group
Frequency converter 123 and second group of frequency converter 124 are including N to frequency converter, the multiple that wherein N is 3.In the present embodiment, described
One group of frequency converter 123 and second group of frequency converter 124 include 3 pairs of frequency converters.Include that structure is identical per a pair of frequency converter
First branch path 127 and the second branch path 128.First branch path, 127 and second branch path 128 includes setting gradually
First switching element, the first insulated gate bipolar transistor and second switch element, wherein the first switching element, second opening
One kind that element is the switch element 121 is closed, the first insulated gate bipolar transistor is the insulated gate bipolar transistor
122 one kind.Equally, the outlet side frequency converter includes third group frequency converter 125 and the 4th group of frequency converter 126, the third
Including N to frequency converter, the multiple that wherein N is 3 is in the present embodiment, described for group frequency converter 125 and the 4th group of frequency converter 126
Third group frequency converter 125 and the 4th group of frequency converter 126 include 3 pairs of frequency converters.That is, input side frequency converter includes 6 pairs
Frequency converter, outlet side frequency converter also include 6 pairs of frequency converters.
Include identical first branch path, 127 and second branch path 128 of structure per a pair of frequency converter；Described first point
Branch 127 and the second branch path 128 include the first switching element set gradually, the first insulated gate bipolar transistor and the
Two switch elements, wherein the first switching element, second switch element are one kind of the switch element 121, the first insulation
Grid bipolar transistor is one kind of the insulated gate bipolar transistor 122.
Therefore, when first group of frequency converter 123 and second group of frequency converter 124 (i.e. input side frequency converter) or third group frequency conversion
Device 125 and every a pair of of frequency converter of the 4th group of frequency converter 126 (i.e. outlet side frequency converter) (may be the first branch path 127 or the
Two branch paths 128) in insulated gate bipolar transistor 122 break down (damage or short circuit) when, the input side electric current inspection
The failure can be detected in real time by surveying device 131 and the outlet side current detector 132, and fault-signal is transmitted in real time
To the microcomputer 110.
The microcomputer 110 is after receiving fault-signal, to every a pair of of change of input side frequency converter and outlet side frequency converter
122 time of insulated gate bipolar transistor in the first branch path 127 in frequency device extremely short normal driving signal, and to input
The insulated gate bipolar transistor in the second branch path 128 in every a pair of of frequency converter of side frequency converter and outlet side frequency converter
122 do not give drive signal.If input side current detector 131 and outlet side current detector 132 still detect event at this time
Hinder signal, then explanation is by the first branch path 127 in every a pair of of frequency converter of input side frequency converter and outlet side frequency converter
Insulated gate bipolar transistor 122 forms this set of frequency converter there are failure, and the microcomputer 110 passes through I/O interface unit 114
To disconnect all contactor main contacts of this set of frequency converter；Simultaneously to every a pair of input side frequency converter and outlet side frequency converter
122 normal driving of insulated gate bipolar transistor in the second branch path 128 in frequency converter, and microcomputer 110 was according at that time
Load-carrying in car simultaneously makes corresponding operation measures based on a logical operation rule, order deceleration of elevator operation or nearby
Flat bed discharges passenger.Certainly, if event is not detected in input side current detector 131 and outlet side current detector 132 at that time
Hinder signal, then corresponding action is opposite with the above situation.
In another embodiment of the utility model, the converter plant 120 further comprises that two structures are identical and simultaneously
The input side frequency converter and outlet side frequency converter of connection.Referring to Fig. 3, the converter plant 120 includes being set to top and being set to
Lower section and the identical input side frequency converter of structure and outlet side frequency converter.
Each input side frequency converter is separated by one first bus capacitor (not identified in figure) with outlet side frequency converter；
Each input side frequency converter is connected to the first three-phase alternating current by first switching element, and by first three-phase alternating current
Electric rectification is at high voltage direct current and is stored in first bus capacitor；Each outlet side frequency converter is received from described
The power supply of first bus capacitor, and the second three-phase alternating current is connected to drive elevator host 140 by second switch element.
Each input side frequency converter includes first group of frequency converter 123 and second group of frequency converter 124, first group of change
Frequency device 123 and second group of frequency converter 124 are including N to frequency converter, the multiple that wherein N is 3.In another embodiment, institute
It includes 3 pairs of frequency converters to state first group of frequency converter 123 and second group of frequency converter 124.Include structure phase per a pair of frequency converter
Same the first branch path 127 and the second branch path 128；First branch path, 127 and second branch path 128 includes first exhausted
Edge grid bipolar transistor, wherein the first insulated gate bipolar transistor is one kind of the insulated gate bipolar transistor 122；
Each outlet side frequency converter includes third group frequency converter 125 and the 4th group of frequency converter 126, the third group frequency converter 125
With the 4th group of frequency converter 126 including N to frequency converter, the multiple that wherein N is 3.In another embodiment, the third group
Frequency converter 125 and the 4th group of frequency converter 126 include 3 pairs of frequency converters.Include structure identical first per a pair of frequency converter
Branch path 127 and the second branch path 128.First branch path, 127 and second branch path 128 includes the first insulated gate bipolar
Transistor npn npn.First group of frequency converter 123 and second group of frequency conversion 124 are connected to the first three-phase by identical first switching element
Alternating current, third group frequency converter 125 and the 4th group of frequency conversion 126 are connected to the two or three intersection by identical second switch element
Galvanic electricity, wherein the first switching element is one kind of the switch element 121, the first insulated gate bipolar transistor is described
One kind of insulated gate bipolar transistor 122.
Therefore, it when the input side frequency converter and outlet side frequency converter (being visually integral) for being set to top, or is set to
Event occurs for the insulated gate bipolar transistor 122 in the input side frequency converter and outlet side frequency converter (being visually integral) of lower section
When barrier (damage or short circuit), input side current detector 131 and outlet side current detector 132 can detect the event in real time
Barrier, and fault-signal is sent to the microcomputer 110 in real time.
The microcomputer 110 is after receiving fault-signal, to the input side frequency converter and outlet side frequency conversion for being set to top
122 time of all insulated gate bipolar transistors in device extremely short normal driving signal, the input side to being set to lower section become
All insulated gate bipolar transistors 122 of frequency device and outlet side frequency converter do not give drive signal.If at this point, input side electric current
Detector 131 and outlet side current detector 132 still detect fault-signal, then explanation is set to the input side frequency conversion of top
There are 122 failures of insulated gate bipolar transistor, the microcomputer 110 to pass through I/O interface unit 114 in device and outlet side frequency converter
To disconnect the input side of this set of frequency converter and the contactor main contacts of outlet side；Simultaneously to the input side frequency conversion for being set to lower section
122 normal driving of all insulated gate bipolar transistors in device and outlet side frequency converter, and microcomputer 110 is according to car at that time
Interior load-carrying simultaneously makes corresponding operation measures based on a logical operation rule, the operation of order deceleration of elevator or nearby flat bed
Discharge passenger.Certainly, if failure letter is not detected in input side current detector 131 and outlet side current detector 132 at that time
Number, then corresponding action is opposite with the above situation.
Elevator described in the utility model can be broken down with frequency conversion equipment in elevator frequency converter, and after elevator emergency stop, institute
It states device and corresponding operation measures is made by the logical operation and judgement of microcomputer 110 under the premise that security is guaranteed, to
Greatly improve the reliability and operational efficiency of described device.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
Art personnel can also make several improvements and modifications without departing from the principle of this utility model, these improvements and modifications
Also it should be regarded as the scope of protection of the utility model.
Claims (9)
1. a kind of elevator frequency conversion equipment, which is characterized in that including：
One converter plant, the converter plant include multiple switch element and multiple insulated gate bipolar transistors, the frequency conversion
Device is for driving an elevator host；
One current detector, the current detector are connected with the converter plant and the elevator host respectively, the electric current
Detector includes input side current detector and outlet side current detector, and the current detector is for monitoring the change in real time
The input side electric current and outlet side electric current of frequency device, when the converter plant breaks down, the current detector is by failure
Signal is sent to a microcomputer in real time；
The microcomputer is connected with the converter plant and the current detector respectively, and the microcomputer is used to be examined according to the electric current
The working condition for surveying the converter plant detected by device carries out logical operation and judgement, and sends corresponding control instruction to described
Converter plant, and then control the switch element and insulated gate bipolar transistor on or off of the converter plant.
2. elevator frequency conversion equipment according to claim 1, which is characterized in that the microcomputer includes：One communication unit, one
Logical operation process unit, a control unit and an I/O interface unit；Wherein,
The communication unit is connected with the current detector, and the communication unit is used for the working condition of the converter plant
It is sent to the logical operation process unit；
The logical operation process unit is connected with described control unit, and the logical operation process unit is used for according to the change
The working condition of frequency device and corresponding control instruction is obtained based on a logical operation rule；
Described control unit is connected with the insulated gate bipolar transistor of the I/O interface unit and the converter plant respectively, institute
State on or off of the control unit for driving the insulated gate bipolar transistor according to the control instruction；
The I/O interface unit is connected with the switch element of the converter plant, and the I/O interface unit is used to fill when the frequency conversion
It sets when breaking down, controls corresponding switch element and disconnect.
3. elevator frequency conversion equipment according to claim 2, which is characterized in that the microcomputer further includes：
One storage unit, the storage unit is connected with the logical operation process unit and described control unit respectively, described
Storage unit is used to store the logical operation process unit generated data when carrying out logical operation and judging, and will
Handling result is sent to described control unit.
4. elevator frequency conversion equipment according to claim 1, which is characterized in that the multiple switch element is contactor,
Each switch element is used to control the on or off in each insulated gate bipolar transistor circuit.
5. elevator frequency conversion equipment according to claim 1, which is characterized in that the converter plant further comprises inputting
Side frequency converter and outlet side frequency converter；Input side frequency converter is separated by one first bus capacitor with outlet side frequency converter；It is described
First three-phase alternating current is rectified into high voltage direct current and is stored in first bus capacitor by input side frequency converter；It is described defeated
Go out side frequency converter and receive the power supply from first bus capacitor, and by the second three-phase alternating current to drive elevator master
Machine.
6. elevator frequency conversion equipment according to claim 5, which is characterized in that the input side frequency converter includes first group
Including N to frequency converter, wherein N is 3 for frequency converter and second group of frequency converter, first group of frequency converter and second group of frequency converter
Multiple includes identical first branch path of structure and the second branch path per a pair of frequency converter；First branch path and
Two branch paths include first switching element, the first insulated gate bipolar transistor and the second switch element set gradually,
Described in first switching element, one kind that second switch element is the switch element, the first insulated gate bipolar transistor is
One kind of the insulated gate bipolar transistor；The outlet side frequency converter includes third group frequency converter and the 4th group of frequency converter,
The third group frequency converter and the 4th group of frequency converter are including N to frequency converter, the multiple that wherein N is 3, per a pair of frequency converter
Including identical first branch path of structure and the second branch path；First branch path and the second branch path include setting gradually
First switching element, the first insulated gate bipolar transistor and second switch element, wherein the first switching element, second
Switch element is one kind of the switch element, and the first insulated gate bipolar transistor is the insulated gate bipolar transistor
It is a kind of.
7. elevator frequency conversion equipment according to claim 1, which is characterized in that the converter plant further comprises two
The identical and in parallel input side frequency converter of structure and outlet side frequency converter；Each input side frequency converter passes through one first busbar
Capacitance is separated with outlet side frequency converter；Each input side frequency converter is connected to the first three-phase alternating current by first switching element
Electricity, and the first three-phase alternating current is rectified into high voltage direct current and is stored in first bus capacitor；Each output
Side frequency converter receives the power supply from first bus capacitor, and is connected to the second three-phase alternating current by second switch element
Electricity is to drive elevator host.
8. elevator frequency conversion equipment according to claim 7, which is characterized in that each input side frequency converter includes the
One group of frequency converter and second group of frequency converter, first group of frequency converter and second group of frequency converter include N to frequency converter, wherein N
Include identical first branch path of structure and the second branch path per a pair of frequency converter for 3 multiple；First branch path
Include the first insulated gate bipolar transistor with the second branch path, wherein the first insulated gate bipolar transistor is the insulation
One kind of grid bipolar transistor；Each outlet side frequency converter includes third group frequency converter and the 4th group of frequency converter, described
Including N to frequency converter, the multiple that wherein N is 3 includes per a pair of frequency converter for third group frequency converter and the 4th group of frequency converter
Identical first branch path of structure and the second branch path；First branch path and the second branch path include that the first insulated gate is double
Bipolar transistor；The wherein described first switching element, one kind that second switch element is the switch element, the first insulated gate are double
Bipolar transistor is one kind of the insulated gate bipolar transistor.
9. elevator frequency conversion equipment according to claim 1, which is characterized in that the current detector is current sense
Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721381907.2U CN207652318U (en) | 2017-10-25 | 2017-10-25 | A kind of elevator frequency conversion equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721381907.2U CN207652318U (en) | 2017-10-25 | 2017-10-25 | A kind of elevator frequency conversion equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207652318U true CN207652318U (en) | 2018-07-24 |
Family
ID=62883778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721381907.2U Active CN207652318U (en) | 2017-10-25 | 2017-10-25 | A kind of elevator frequency conversion equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207652318U (en) |
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2017
- 2017-10-25 CN CN201721381907.2U patent/CN207652318U/en active Active
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