CN106712464A - Frequency converter digital signal input terminal and frequency converter - Google Patents
Frequency converter digital signal input terminal and frequency converter Download PDFInfo
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- CN106712464A CN106712464A CN201710108297.7A CN201710108297A CN106712464A CN 106712464 A CN106712464 A CN 106712464A CN 201710108297 A CN201710108297 A CN 201710108297A CN 106712464 A CN106712464 A CN 106712464A
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- frequency converter
- diode
- signal processing
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0083—Converters characterised by their input or output configuration
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention belongs to the technical field of a frequency converter and provides a frequency converter digital signal input terminal and a frequency converter. The frequency converter digital signal input terminal is connected between a digital signal source and a controller, and comprises a mode control circuit and a digital signal processing circuit. The mode control circuit outputs an enable signal to the controller to realize selection of a signal processing mode of the controller; the mode control circuit outputs an anti-misoperation signal to enable the output of the digital signal processing circuit to be stable; and the digital signal processing circuit sends the processed digital output signal to the controller. The frequency converter digital signal input terminal can realize an effect same with a conventional frequency converter having an optocoupler under the condition of not having the optocoupler, so that manufacture cost is reduced.
Description
Technical field
The invention belongs to converter technology field, more particularly to frequency converter digital signal input end and frequency converter.
Background technology
The control terminal circuit of frequency converter is connected with external control circuit.The control terminal of frequency converter, with character of circuit
To divide, digital control terminal and simulation control terminal can be divided into；Divided with the input of signal, output, input signal end can be divided into
Son and output signal terminal.Digital signal input end, starting, stopping, reset, multistage speed operation etc. can be completed to frequency converter and is controlled
System.
Existing frequency converter digital signal input end is mainly passed through by jumper terminal, diode, resistance, electric capacity and optocoupler
Electrical connection is realized.The data signal of input terminal is connected to light by the front stage circuits of the compositions such as diode, resistance and electric capacity
Coupling primary side, is controlled by the break-make of optocoupler, and data signal finally is sent into digital signal processing chip by optical coupling secondary edges.It is existing
Frequency converter product typically has 4-7 railway digitals signal input terminal and provides expanded function, then need to use 4-7 or more
Optocoupler, because optocoupler price in itself is higher, causes production cost high.Therefore, existing frequency converter digital signal input end
There is high cost because being realized using optocoupler in son.
The content of the invention
It is an object of the invention to provide frequency converter digital signal input end and frequency converter, it is intended to solve prior art institute
Frequency converter digital signal input end of presence is using optocoupler realization, the problem of high cost.
The first aspect of the present invention, there is provided frequency converter digital signal input end, for be connected to derived digital signal and
Between controller, including mode control circuit and digital signal processing circuit；
First output end of the mode control circuit connects the first input end of the controller, the Schema control electricity
Second output end on road connects the first input end of the digital signal processing circuit, the second of the digital signal processing circuit
Input connects the output end of the derived digital signal, and the output end of the digital signal processing circuit connects the controller
Second input；
The mode control circuit output enables signal makes the controller determine corresponding signal processing model, the mould
Formula control circuit output anti-misoperation signal is used to stablize the output voltage of the digital signal processing circuit, the data signal
Process circuit obtains data signal and exports to the controller according to the digital source signal that the derived digital signal is exported.
The second aspect of the present invention, there is provided frequency converter, including above-mentioned frequency converter digital signal input end.
The present invention is by electric using mode control circuit and Digital Signal Processing in frequency converter digital signal input end
Road, enabling signal by mode control circuit output makes controller determine corresponding signal processing model, mode control circuit output
Anti-misoperation signal is used to stablize the output voltage of digital signal processing circuit, and digital signal processing circuit is according to derived digital signal
The digital source signal of output obtains data signal and exports to controller, so that frequency converter digital signal input end does not make
The function consistent with the conventional inverter device with optocoupler can be realized with the case of optocoupler, manufacturing cost is reduced.
Brief description of the drawings
Fig. 1 is the structure chart of frequency converter digital signal input end that the embodiment of the present invention is provided；
Fig. 2 is the exemplary circuit structure chart of frequency converter digital signal input end that first embodiment of the invention is provided；
Fig. 3 is the exemplary circuit structure chart of frequency converter digital signal input end that second embodiment of the invention is provided.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The embodiment of the present invention uses mode control circuit and data signal by frequency converter digital signal input end
Process circuit, enabling signal by mode control circuit output makes controller determine corresponding signal processing model, Schema control electricity
Road output anti-misoperation signal is used to stablize the output voltage of digital signal processing circuit, and digital signal processing circuit is according to numeral
The digital source signal of signal source output obtains data signal and exports to controller, so that frequency converter digital signal input end is sub
The function consistent with the conventional inverter device with optocoupler can be realized in the case where optocoupler is not used, is reduced and is manufactured into
This..
Fig. 1 shows the structure of frequency converter digital signal input end that the embodiment of the present invention is provided, for the ease of saying
It is bright, the part related to the embodiment of the present invention is illustrate only, details are as follows：
Frequency converter digital signal input end, for being connected between derived digital signal 300 and controller 400, including mould
Formula controls circuit 100 and digital signal processing circuit 200.
First output end of mode control circuit 100 connects the first input end of controller 400, mode control circuit 100
The second output end connect digital signal processing circuit 200 first input end, digital signal processing circuit 200 second input
The output end of end connection derived digital signal 300, the second of the output end connection controller 400 of digital signal processing circuit 200 is defeated
Enter end.
The output of mode control circuit 100 enables signal makes the controller 400 determine corresponding signal processing model, pattern
The control output anti-misoperation signal of circuit 100 is used to stablize the output voltage of digital signal processing circuit 200, Digital Signal Processing
Circuit 200 obtains data signal and exports to controller 400 according to the digital source signal that derived digital signal 300 is exported.
In embodiments of the present invention, derived digital signal 300 is the derived digital signal that user accesses.Controller 400 is numeral
Signal processing chip, such as DSP (Digital Signal Processing, Digital Signal Processing) chip or FPGA (Field
Programmable Gate Array, field programmable gate array) chip etc..
The output of mode control circuit 100 enables signal makes controller 400 determine corresponding signal processing model.Specifically,
As a kind of embodiment, when the enable signal that the first input end of controller 400 is received is low level, its second input
The data signal for receiving is held for high level is effective；When the enable signal that the first input end of controller 400 is received is high level,
The data signal that its second input is received is Low level effective.
Mode control circuit 100 exports anti-misoperation signal to digital signal processing circuit 200, primarily to ensureing
The no signal supplied with digital signal process circuit 200 of derived digital signal 300 (i.e. the second input of digital signal processing circuit 200
When vacantly), the output of digital signal processing circuit 200 is still stablized, it is to avoid the output error signal of digital signal processing circuit 200
To controller 400 so as to cause controller 400 that maloperation occurs.By taking concrete condition as an example, when digital signal processing circuit 200
When second input is hanging, the digital source signal that it is received is unstable signal (voltage may be height, it is also possible to for low), then may be used
Maloperation can be caused by outside, the hand of such as operator contacts electrostatic may cause a high level to be input into, so as to cause
Trigger controller.Anti-misoperation signal is used to avoid such case, it is ensured that the output voltage of digital signal processing circuit 200 is steady
It is fixed.
Digital signal processing circuit 200 obtains data signal and defeated according to the digital source signal that derived digital signal 300 is exported
Go out to controller 400.Specifically, digital signal processing circuit 200 is processed digital source signal, the numeral letter that adjustment is obtained
Number controller 400 allow input voltage range in.
Above-mentioned implementing for frequency converter digital signal input end is retouched in detail below in conjunction with specific embodiment
State：
Embodiment one：
Fig. 2 shows the exemplary circuit knot of frequency converter digital signal input end that first embodiment of the invention is provided
Structure, for convenience of description, illustrate only the part related to first embodiment of the invention, and details are as follows：
Used as one embodiment of the invention, mode control circuit 100 includes：
First connector, resistance R1, resistance R2, electric capacity C1, diode D1 and diode D2.
First the first power supply V1 of termination of the first connector, the second end of the first connector is the second of mode control circuit
Output end, the first end of the second end connection resistance R1 of the first connector, second end of resistance R1 is the of mode control circuit
One output end, second end of resistance R1 connects the positive pole of the first end, the first end of electric capacity C1 and diode D1 of resistance R2 simultaneously,
Second end of resistance R2 and the second end common ground of electric capacity C1, the positive pole of diode D1 connect the negative pole of diode D2, diode
The plus earth of D2, the negative pole of diode D1 meets second source V2.
Specifically, the first connector can be various connectors or switch etc..
Specifically, the first power supply V1 and second source V2 are dc source, it is different voltages etc. that can be arranged as required to
Level.First power supply V1 and second source V2 can be provided in power module in mode control circuit 100, or external
Power supply.
Specifically, in the first embodiment of the invention, the first connector is row's pin J1.
Used as one embodiment of the invention, digital signal processing circuit 200 includes：
Resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, electric capacity C3, diode D3, diode D4 and diode
D5。
The just extremely first input end of digital signal processing circuit of diode D3, the negative pole connecting resistance R6's of diode D3
First end, second end of resistance R6 is the second input of digital signal processing circuit, and second end of resistance R6 connects electricity simultaneously
The first end of R7 and the first end of resistance R8 are hindered, second end of resistance R8 is the output end of digital signal processing circuit, resistance R8
The second end connecting first end, the first end of resistance R10, the first end of electric capacity C3 and the diode D4 of resistance R9 simultaneously just
Pole, second end at second end of resistance R7, second end of resistance R9 and electric capacity C3 is connected to ground, second end of resistance R10 and two altogether
The negative pole of pole pipe D4 connects the 5th power supply V5 jointly, and the positive pole of diode D4 connects the negative pole of diode D5, the positive pole of diode D5
Ground connection.
Specifically, the 5th power supply V5 is dc source, it is different voltage class that can be arranged as required to.5th power supply V5 can
To be provided in power module, or external power supply in digital signal processing circuit 200.
Specifically, in the first embodiment of the invention, controller 400 is Digital Signal Processing (DSP) chip.
Above-mentioned frequency converter digital signal input end is described further below in conjunction with operation principle：
As shown in Fig. 2 the enable signal of the first output end output of mode control circuit 100 is EN signals, the second output
The anti-misoperation signal for holding output is Source signals.The digital source that second input of digital signal processing circuit 200 is received
Signal is D_IN signals, and the data signal of output end output is D_OUT signals.
During work, in mode control circuit 100, the first power supply V1 and second source V2 can be adjusted to according to different designs
Different voltage class.1 pin of row's pin J1 is connected to the first power supply V1；Electric capacity C1 strobes；Diode D1 and diode
One end of D2 is connected to second source V2, and one end is grounded, and Main Function is by node voltage VDClamper is between 0~V2, so as to protect
Card is input to the EN signals of dsp chip first input end in the voltage range for allowing input, it is to avoid dsp chip excessive pressure damages.
When 1, the 2 pin not short circuit of row pin J1, Source signals by resistance R1, resistance R2 with being pulled to, similarly EN signals
Also it is 0V to be pulled to ground, i.e. Source signals, and EN signals are low level state, and it is height to be now input into the D_OUT signals of dsp chip
Level is effective；
When 1, the 2 pin short circuits of row's pin J1, Source signals are connected with the first power supply V1, and resistance R1, resistance R2 constitute partial pressure
Circuit, now equal to the voltage at resistance R2 two ends, i.e. equal to V1, EN signals are high level state to Source signals to EN signals, this
When input dsp chip D_OUT signals be Low level effective.
During work, in digital signal processing circuit 200, resistance R7, resistance R8 series connection after it is in parallel with resistance R9, then with resistance
R10 constitutes bleeder circuit, carries out partial pressure to the 5th power supply V5, the voltage that the 5th power supply V5 buttons are gone after resistance R10 both end voltages by
D_OUT signals are sent to dsp chip, so that ensureing the second input of dsp chip has a level for determination, this level falls
The intermediate area of low level and high level, no matter arrange in mode control circuit 100 pin J1 1,2 pin whether short circuit, all protect
The second input demonstrate,proved in mode control circuit 100 is vacantly that dsp chip does not occur maloperation during without D_IN signals.Numeral letter
In number process circuit 200, D_IN signals are digital source signal, are accessed by user；Diode D3 is used to prevent negative voltage from pouring in down a chimney stream
To Source signal ends；Electric capacity C3 strobes in circuit；Resistance R8 is primarily to prevent from being input to the D_ of dsp chip
OUT signal electric current allows the maximum of input more than it, causes dsp chip overcurrent damage, plays metering function；Diode D4 and two
The D_OUT signal voltages that pole pipe D5 will enter into dsp chip are clamped between 0V~V2, prevent dsp chip excessive pressure damages, play clamper
Effect.
To sum up, when 1, the 2 pin not short circuit of pin J1 is arranged, Source signals are 0V, and EN signals are low level state, D_OUT
Be the 5th power supply V5 through the voltage after partial pressure clamper, now D_IN signals are that high level is effective.When 1, the 2 pin short circuits of row's pin J1
When, Source signals are equal to V1, and EN signals are high level state, and now D_IN signals are Low level effective.
It follows that the level of Source signals is always with the significant level of D_IN signals conversely, so ensure that
Controller 400 is not in that (user what when not connecing, Digital Signal Processing electricity for maloperation when as user, what does not connect
Second input on road 200 is hanging, not know level).So the effect of Source is exactly to digital signal processing circuit 200
The determination of first input end one level, it is ensured that user does not access signal, and controller 400 works and do not malfunction.
If user does not access D_IN signals, when the second input of digital signal processing circuit 200 is hanging, level may
It is height, it is also possible to for low, thus by outside the hand contact electrostatic of maloperation, such as operator may be caused may to cause
One high level input, Source signals are exactly mainly to avoid such case, it is to avoid external trigger.
Embodiment two：
Fig. 3 shows the exemplary circuit knot of frequency converter digital signal input end that second embodiment of the invention is provided
Structure, for convenience of description, illustrate only the part related to second embodiment of the invention, and details are as follows：
Used as one embodiment of the invention, mode control circuit 100 includes：
Second connector, resistance R3, resistance R4, electric capacity C2, switching tube 101 and resistance R5；
First the 3rd power supply V3 of termination of the second connector, the second end of the second connector is the second of mode control circuit
Output end, the first end of the second end connection resistance R3 of the second connector, second end of resistance R3 connects the of resistance R4 simultaneously
The controlled end of one end, the first end of electric capacity C2 and switching tube 101, second end of resistance R4 connects jointly with second end of electric capacity C2
Ground, the hot end of switching tube 101 is the first output end of mode control circuit, the hot end connecting resistance R5 of switching tube 101
First end, resistance R5 second termination the 4th power supply V4, switching tube 101 cold end ground connection.
Specifically, above-mentioned switching tube 101 is NPN type triode Q1, the base stage of NPN type triode Q1 is switching tube 101
Controlled end, the hot end of the current collection extremely switching tube 101 of NPN type triode Q1, the transmitting of NPN type triode Q1 is extremely switched
The cold end of pipe 101.
Specifically, the second connector is row's pin J2.
Specifically, the 3rd power supply V3 and the 4th power supply V4 are dc source, it is different voltages etc. that can be arranged as required to
Level.3rd power supply V3 and the 4th power supply V4 can be provided in power module, or external electricity in mode control circuit 100
Source.
Above-mentioned frequency converter digital signal input end is described further below in conjunction with operation principle：
As shown in figure 3, the enable signal of the first output end output of mode control circuit 100 is EN ' signals, the second output
The anti-misoperation signal for holding output is Source ' signals.The digital source that second input of digital signal processing circuit 200 is received
Signal is D_IN ' signals, and the data signal of output end output is D_OUT ' signals.
During work, in mode control circuit 100, when row's pin J2 short circuits, output EN ' signals are low levels；When row's pin J2 breaks
Open, output EN ' signals are high level.
When row pin J2 short circuits, the base stage high voltage of triode Q1, triode Q1 be in saturation conduction state, colelctor electrode and
Emitter stage is turned on, equivalent to the conducting state of switch between collector and emitter.
Saturation conduction state is：When the voltage for being added in triode Q1 emitter junctions is more than the conducting voltage of PN junction, and work as base stage
Electric current increases when to a certain extent, and collector current no longer increases with the increase of base current, but in certain certain value
Nearby less change, at this moment triode Q1 loses Current amplifier effect, the voltage very little between colelctor electrode and emitter stage, current collection
Equivalent to the conducting state of switch between pole and emitter stage.
When row's pin J2 disconnects, triode Q1 is in cut-off state, and collector and emitter disconnects.
Cut-off state is：When conducting voltage of the voltage less than PN junction for being added in triode Q1 emitter junctions, base current is zero,
Collector current and emitter current are all zero, triode Q1 now lose Current amplifier effect, collector and emitter it
Between equivalent to switch off-state.
The internal junction of the digital signal processing circuit 200 in frequency converter digital signal input end that the present embodiment is provided
Structure is identical with the internal structure of the digital signal processing circuit 200 that first embodiment of the invention is provided, therefore repeats no more.
The embodiment of the present invention is believed by frequency converter digital signal input end using mode control circuit 100 and numeral
Number process circuit 200, is exported by mode control circuit 100 and enables signal to controller 400 to realize the signal of controller 400
The selection of reason pattern, the output anti-misoperation signal of mode control circuit 100 makes the output of digital signal processing circuit 200 steady
Fixed, the digital output signal after treatment is sent to controller 400 by digital signal processing circuit 200, so that frequency converter is digital
Signal input terminal can realize the function consistent with the conventional inverter device with optocoupler in the case where optocoupler is not used, drop
Low manufacturing cost, and simple structure, circuit threshold value adjusting range are wide, can apply on frequency converter product, with very strong
Adaptability and practicality.
Based on the advantage of above-mentioned frequency converter digital signal input end, the embodiment of the present invention additionally provides a kind of frequency converter,
It includes above-mentioned frequency converter digital signal input end.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (9)
1. frequency converter digital signal input end is sub, for being connected between derived digital signal and controller, it is characterised in that：Including
Mode control circuit and digital signal processing circuit；
First output end of the mode control circuit connects the first input end of the controller, the mode control circuit
Second output end connects the first input end of the digital signal processing circuit, the second input of the digital signal processing circuit
The output end of the end connection derived digital signal, the output end of the digital signal processing circuit connects the second of the controller
Input；
The mode control circuit output enables signal makes the controller determine corresponding signal processing model, the pattern control
Circuit output anti-misoperation signal processed is used to stablize the output voltage of the digital signal processing circuit, the Digital Signal Processing
Circuit obtains data signal and exports to the controller according to the digital source signal that the derived digital signal is exported.
2. frequency converter digital signal input end according to claim 1 is sub, it is characterised in that the mode control circuit bag
Include：
First connector, resistance R1, resistance R2, electric capacity C1, diode D1 and diode D2；
First the first power supply of termination of first connector, the second end of first connector is the mode control circuit
The second output end, the second end of first connector connects the first end of the resistance R1, second end of the resistance R1
Be the first output end of the mode control circuit, second end of the resistance R1 connect simultaneously the first end of the resistance R2,
The positive pole of the first end of the electric capacity C1 and the diode D1, second end of second end of the resistance R2 and the electric capacity C1
Common ground, the positive pole of the diode D1 connects the negative pole of the diode D2, the plus earth of the diode D2, described two
The negative pole of pole pipe D1 connects second source.
3. frequency converter digital signal input end according to claim 2 is sub, it is characterised in that：First connector is row
Pin J1.
4. frequency converter digital signal input end according to claim 1 is sub, it is characterised in that the mode control circuit bag
Include：
Second connector, resistance R3, resistance R4, electric capacity C2, switching tube and resistance R5；
First the 3rd power supply of termination of second connector, the second end of second connector is the mode control circuit
The second output end, the second end of second connector connects the first end of the resistance R3, second end of the resistance R3
The controlled end of the first end, the first end of the electric capacity C2 and the switching tube of the resistance R4, the resistance R4 are connected simultaneously
The second end and the electric capacity C2 the second end common ground, the hot end of the switching tube is the mode control circuit
First output end, the high potential of the switching tube terminates the first end of the resistance R5, second termination the 4th of the resistance R5
Power supply, the cold end ground connection of the switching tube.
5. frequency converter digital signal input end according to claim 4 is sub, it is characterised in that：The switching tube is NPN type
The base stage of triode Q1, the NPN type triode Q1 is the controlled end of the switching tube, the current collection of the NPN type triode Q1
The hot end of extremely described switching tube, the cold end of the extremely described switching tube of transmitting of the NPN type triode Q1.
6. frequency converter digital signal input end according to claim 4 is sub, it is characterised in that：Second connector is row
Pin J2.
7. frequency converter digital signal input end according to claim 1 is sub, it is characterised in that the Digital Signal Processing electricity
Road includes：
Resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, electric capacity C3, diode D3, diode D4 and diode D5；
The first input end of the just extremely described digital signal processing circuit of the diode D3, the negative pole of the diode D3 connects
The first end of the resistance R6, second end of the resistance R6 is the second input of the digital signal processing circuit, described
Second end of resistance R6 connects the first end of the resistance R7 and the first end of the resistance R8, the second of the resistance R8 simultaneously
It is the output end of the digital signal processing circuit to hold, and second end of the resistance R8 connects the first of the resistance R9 simultaneously
The positive pole at end, the first end of the resistance R10, the first end of the electric capacity C3 and the diode D4, the of the resistance R7
Second end at two ends, second end of the resistance R9 and the electric capacity C3 is connected to ground, second end of the resistance R10 and described altogether
The negative pole of diode D4 connects the 5th power supply jointly, and the positive pole of the diode D4 connects the negative pole of the diode D5, described two
The plus earth of pole pipe D5.
8. frequency converter digital signal input end according to claim 1 is sub, it is characterised in that：The controller is believed for numeral
Number process chip.
9. frequency converter, it is characterised in that：Including frequency converter digital signal input end as described in claim any one of 1-8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710108297.7A CN106712464B (en) | 2017-02-27 | 2017-02-27 | Digital signal input terminal of frequency converter and frequency converter |
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|---|---|---|---|
| CN201710108297.7A CN106712464B (en) | 2017-02-27 | 2017-02-27 | Digital signal input terminal of frequency converter and frequency converter |
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| CN202444248U (en) * | 2012-02-14 | 2012-09-19 | 北京千驷驭电气有限公司 | Direct-current traction power supply protection device |
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| CN105553379A (en) * | 2015-12-29 | 2016-05-04 | 合肥龙多电子科技有限公司 | Interface circuit of variable-frequency driving board and control board |
| CN106451783A (en) * | 2016-11-04 | 2017-02-22 | 浙江中科正方电子技术有限公司 | Remotely controllable power distribution control circuit |
| CN206686066U (en) * | 2017-02-27 | 2017-11-28 | 华远电气股份有限公司 | Frequency converter digital signal input end and frequency converter |
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