CN203038049U - Programmable AC power source digital platform - Google Patents
Programmable AC power source digital platform Download PDFInfo
- Publication number
- CN203038049U CN203038049U CN 201320062703 CN201320062703U CN203038049U CN 203038049 U CN203038049 U CN 203038049U CN 201320062703 CN201320062703 CN 201320062703 CN 201320062703 U CN201320062703 U CN 201320062703U CN 203038049 U CN203038049 U CN 203038049U
- Authority
- CN
- China
- Prior art keywords
- circuit
- module
- power
- inverter
- processor module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Inverter Devices (AREA)
Abstract
The utility model relates to a digital platform for controlling, analyzing and displaying a programmable AC power source and more specifically relates to a programmable AC power source digital platform based on FPGA, DSP and ARM. The programmable AC power source digital platform based on the FPGA, the DSP and the ARM includes an inverter and signal collecting circuit, a heat dissipating device and a numerical control and display platform, wherein the inverter and signal collecting circuit includes an inverter core circuit, a temperature detecting circuit, an LC filtering circuit and a data collecting module; and the numerical control and display platform includes an FPGA (Field-Programmable Gate Array) module, a DSP (Digital Signal Processor) module, a keying circuit, an LCD display circuit, an ARM processor module and a communication expansion circuit. According to the utility model, a closed-loop control system is composed of the FPGA, the DSP and the ARM, so that the high-precision output of the programmable power source is realized.
Description
Technical field
The utility model relates to control, the analysis of AC power able to programme and shows digital platform, more specifically, relates to a kind of AC power digital platform able to programme based on FPGA, DSP and ARM.
Background technology
Programmable power supply refers to the power supply that some function or parameter can be controlled by computer software programming, can simulate various power supply states, power supply distortion easily, can carry out electricity characteristic easily and measure and analyze, be widely used in fields such as research and development, production.Traditional AC power able to programme adopts high speed digital signal processor (DSP) to finish system control function in conjunction with peripheral components.Development along with Power Electronic Technique, function and the structure of AC power supply system able to programme become increasingly complex, and require not only that output power is big, waveform can be program control arbitrarily, and require the precision height of output, the DSP own resources are limited, the needs that can't satisfy working control of this control system.
Because the abundant logic interfacing resource of field programmable gate array (FPGA), programming flexibly, characteristic that can the parallel processing multiple signals, therefore the inverter control platform based on digital signal processor (DSP) and field programmable gate array (FPGA) uses more and more widely.Such as: patent " a kind of control system of three-level inverter and the method " (2005.3.1 of people such as Yan Changhui, Wei Xuesen, golden dawn application; application number 200510033388.6); utilize digital signal processor (DSP) and the field programmable gate array (FPGA) introduced are realized the control of three-level inverter; wherein digital signal processor (DSP) is as processing and the protection work of affairs, and field programmable gate array (FPGA) is for generation of the inverter control signal.But this control platform is not realized closed-loop control, can't realize the accurate control of output signal frequency, amplitude, does not have the test section of inverter abnormality yet.Afterwards, the Master's thesis of delivering at Chen Shouxian " the power electronics general digital platform design of networking " (Zhejiang University's master thesis, 2008.7) in the design of the inverter digital platform hardware and software introduced, wherein digital signal processor (DSP) is realized USB, Ethernet, R232 communication interface, and field programmable gate array (FPGA) produces the multi-channel PWM control signal.Realize that thus DSP is good at calculating, but its various interface resource is abundant, and this platform do not realize the inverter circuit closed-loop control yet, can not realize the requirement of high precision output occasion.
Summary of the invention
The technical matters that the utility model solves is to overcome the deficiencies in the prior art, and a kind of AC power digital platform able to programme based on FPGA, DSP and ARM that can realize the inverter circuit closed-loop control and then realize the high precision output of programmable power supply is provided.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is as follows:
A kind of AC power digital platform able to programme comprises successively the inverter that connects and signal acquiring system, numerical control and display platform system, heat abstractor, wherein:
Inverter and signal acquiring system comprise temperature sensing circuit, the inverter core circuit, LC filtering circuit and the data acquisition module that connect successively;
The inverter core circuit is used for finishing the AC-DC-AC transfer process, comprises the full bridge rectifier, power factor (PF) circuit for rectifying (PFC), DC TO DC power circuit and the DC TO AC power circuit that connect successively; Temperature sensing circuit is for detection of the temperature of above-mentioned power circuit;
Full bridge rectifier is used for the civil power full-bridge rectification is become direct current; DC TO DC power circuit is used for converting the signal after the rectification to busbar voltage; DC TO AC power circuit is used for converting busbar voltage to AC signal; The power factor (PF) circuit for rectifying is used for realizing the power factor (PF) rectification of output signal;
Numerical control and display platform system, be used for inverter driving signal SPWM and the generation of PWM, the detection of inverter abnormality, real-time detection, the control of inverter close-loop feedback, the monitoring of system temperature, various input and the demonstration of waveform and the expansion of communication interface of inverter output signal, comprise field programmable gate array (FPGA) module, digital signal processor (DSP) module, key circuit, LCD display circuit, arm processor module and communication interface circuit; Wherein:
The field programmable gate array module drives the adjusting of the detection of signal SPWM and PWM, inverter core circuit abnormality and interruption, heat abstractor and sends corresponding status information to the arm processor module for generation of inverter;
The digital signal processor module, be used for collecting the output signal data that data sampling module obtains, and carry out computational analysis, obtain the parameters of output signal, and the result that will analyze and arm processor module transmit parameter comparison is set, feedback parameter is passed to arm processor module and field programmable gate array module;
The arm processor module is used for realizing human-computer interaction function, drives key circuit and display circuit, and expands various communication interface circuits; The user is arranged parameter send field programmable gate array module and digital signal processor module to, and the status information of the analysis result of receiving digital signals processor module and field programmable gate array module, then result and information are preserved and show by display circuit;
Field programmable gate array module, digital signal processor module and arm processor module link to each other in twos, form closed-loop control system; The digital signal processor module is connected with data acquisition module; Heat abstractor, temperature sensing circuit and field programmable gate array module are formed closed-loop control system, and the power factor (PF) circuit for rectifying in the inverter core circuit, DC TO DC power circuit, DC TO AC power circuit all are connected on the field programmable gate array module.
AC power digital platform able to programme of the present utility model is formed a closed-loop control system with FPGA and DSP, ARM, can realize the high precision output of programmable power supply.FPGA regulates the heat abstractor duty by temperature sensing circuit real-time monitoring system temperature, is in safe range to guarantee system temperature.FPGA in time responds various unusual interruptions in real time to the detection of PFC, DC TO DC power circuit, DC TO AC power circuit abnormality simultaneously; In addition, the AC power digital platform able to programme based on FPGA, DSP and ARM of the present utility model is easy to upgrading and is with good expansibility, and can be used as the general-purpose platform of inverter.
Further, described data acquisition module comprises Hall element, signal conditioning circuit and the high-speed A/D converter that connects successively, Hall element comprises Hall voltage sensor and Hall current sensor, and signal conditioning circuit is for voltage, the current signal to the Hall element collection carries out filtering before high-speed A/D converter, ratio is amplified and amplitude limit.
Further, described heat abstractor is fan, and fan is simple radiating device the most, by regulating rotation speed of the fan, can adjust the intensity of heat radiation.Fan is driven by FPGA, be used for to accelerate the heat radiation of total system, avoids system works overheated and cause safety problem.Described display circuit is the LCD display circuit.
Further, field programmable gate array module, digital signal processor module and arm processor module all link to each other in twos by the SCI interface, satisfy the direct communicating requirement of three.
Further, the digital signal processor module links to each other with data acquisition module by the SPI interface.
Further, communication interface circuit is a kind of or several combination arbitrarily among RS232, USB, GPIB, the Ethernet.One or more interface circuit types can be set as required, realize the standardization of the communication interface of system, be convenient to link to each other with host computer, realize the remote monitoring of data.
Compared with prior art, the beneficial effect of technical solutions of the utility model is: AC power digital platform able to programme of the present utility model, FPGA and DSP, ARM are formed a closed-loop control system, and can realize the high precision output of programmable power supply.FPGA regulates the heat abstractor duty by temperature sensing circuit real-time monitoring system temperature, is in safe range to guarantee system temperature.FPGA in time responds various unusual interruptions in real time to the detection of PFC, DC TO DC power circuit, DC TO AC power circuit abnormality simultaneously; In addition, the utility model AC power digital platform able to programme is realized based on FPGA, DSP and ARM, is easy to upgrade and be with good expansibility, and can be used as the general-purpose platform of inverter.
Description of drawings
Fig. 1 is AC power digital platform structural representation able to programme of the present utility model.
Fig. 2 is field programmable gate array inside modules logic function block diagram.
Fig. 3 is digital signal processor inside modules logic function block diagram.
Embodiment
Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing, in the accompanying drawing from start to finish identical or similar label indicate identical or similar element or the element with identical or similar functions.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the utility model, and can not be interpreted as restriction of the present utility model.
For the ease of explaining and explanation that the size of various piece and structure does not represent physical size, have exaggeratively, have and dwindle, what accompanying drawing was represented only is synoptic diagram, but not pictorial diagram.Specifically describe for clear, some known function and structure are the abridged, and the explanation of these structures has also been omitted.
In the utility model, unless otherwise prescribed or limit, need to prove that term " connection " should be done broad understanding with " linking to each other " etc., for example, can be that mechanical connection or electrical connection or gas circuit connect, also can be the connection of two element internals, can be direct connection, also can be to link to each other indirectly by intermediary, for the ordinary skill in the art, can understand the concrete implication of above-mentioned term as the case may be.
Be illustrated in figure 1 as the structural representation of the AC power digital platform able to programme based on FPGA, DSP and ARM of the present utility model, comprise the inverter that connects successively and signal acquiring system 101, numerical control and display platform system 103, fan 102, wherein:
Inverter and signal acquiring system 101 comprise: temperature sensing circuit 1012 and the inverter core circuit 1011, LC filtering circuit 1013 and the data acquisition module 1014 that connect successively.
Inverter core circuit 1011 is used for finishing the AC-DC-AC transfer process, comprises the full bridge rectifier 10111, PFC power factor (PF) circuit for rectifying 10112, DC TO DC power circuit 10113 and the DC TO AC power circuit 10114 that connect successively.Wherein, full bridge rectifier 10111 is used for the civil power full-bridge rectification is become direct current; DC TO DC power circuit is used for converting the signal after the rectification to busbar voltage; DC TO AC power circuit 10114 is used for converting busbar voltage to AC signal; PFC power factor (PF) circuit for rectifying 10112 is used for realizing the power factor (PF) rectification of output signal.Temperature sensing circuit 1012 is for detection of the temperature of above-mentioned power circuit.
Inverter core circuit 1011 links to each other with LC filtering circuit 1013, inverter output AC signal is through obtaining sine output signal after 1013 filtering of LC filtering circuit, sine output signal is sent to numerical control and 103 analyses of display platform system and demonstration after data acquisition module 1014 is gathered voltage, current parameters.
Data acquisition module 1014 comprises Hall element, signal conditioning circuit and the high-speed A/D converter that connects successively, Hall element comprises Hall voltage sensor and Hall current sensor, and signal conditioning circuit is for voltage, the current signal to the Hall element collection carries out filtering before high-speed A/D converter, ratio is amplified and amplitude limit.
Numerical control and display platform system 103, be used for inverter driving signal SPWM and the generation of PWM, the detection of inverter abnormality, real-time detection, the control of inverter close-loop feedback, the monitoring of system temperature, various input and the demonstration of waveform and the expansion of communication interface of inverter output signal, comprise field programmable gate array (FPGA) module 1031, digital signal processor (DSP) module 1032, key circuit 1033, LCD display circuit 1034, arm processor module 1035, communication interface circuit 1036.Wherein:
Field programmable gate array module 1031 drives the speed governing of the detection of signal SPWM and PWM, inverter core circuit 1011 abnormality and interruption, fan 102 and sends corresponding status information to the arm processor module for generation of inverter.
Digital signal processor module 1032, adopt the TMS320F28335 chip of TI company, its main operational process chip as native system, link to each other with data acquisition module 1014 by the SPI interface, be used for collecting the output signal data that data sampling module obtains, and carry out computational analysis, obtain the voltage root mean square (Vrms) of output signal, electric current root mean square (Irms), voltage peak factor (CFU), current peak factor (CFI), parameters such as power factor (PF) (PF) and principal wave harmonic wave, and the result that will analyze and ARM transmit parameter comparison is set, feedback parameter is passed to arm processor module and FPGA.
Arm processor module 1035 can be selected the S3C2440 chip of Samsung for use.Be used for realizing human-computer interaction function, drive key circuit 1033 and display circuit 1034, and expand various communication interface circuits 1036; The user is arranged parameter (comprising the amplitude of wanting output signal and frequency etc.) send FPGA and DSP module to, and receive the analysis result of DSP module and the status information of FPGA module, then with the result with information is preserved and show by LCD display circuit 1034.
Field programmable gate array module 1031, digital signal processor module 1032 and arm processor module 1035 all link to each other in twos by the SCI interface, form closed-loop control system; Power factor (PF) circuit for rectifying 10112 in fan 102, temperature sensing circuit 1012 and the inverter core circuit 1011, DC TO DC power circuit 10113, DC TO AC power circuit 10114 all are connected on the field programmable gate array module 1031.
The communication interface circuit 1036 of ARM expansion comprises: one or more among RS232, USB, GPIB and the Ethernet, can realize the standardization of the communication interface of system, and be convenient to link to each other with host computer, realize the remote monitoring of data.
The control method of above-mentioned AC power digital platform able to programme based on FPGA, DSP and ARM may further comprise the steps:
S1. the AC signal of 1011 outputs of the inverter core circuit in inverter and the signal acquiring system is through obtaining sine output signal after the filtering of LC filtering circuit, sine output signal is sent to numerical control and display platform system 103 after data collecting module collected voltage, current parameters;
S2. numerical control and display platform system receive the signal from inverter and signal acquiring system transmission, and carry out following processing:
A. producing inverter by field programmable gate array module 1031 drives the duty of signal SPWM and PWM, the detection of carrying out inverter core circuit 1011 abnormality and interruption, adjusting heat abstractor and sends corresponding status information to the arm processor module;
B. collect voltage, the current signal that data sampling module is gathered by the digital signal processor module, and carry out computational analysis, obtain the parameters of output signal, and the result that will analyze and ARM transmit parameter comparison is set, if the AC signal of power amplifier board output is the signal of customer requirements, then analysis result is submitted to demonstration that the arm processor module is correlated with and communicated by letter, if output signal is not user's signalization, then the field programmable gate array module is sent look-at-me, meanwhile the arm processor module is sent warning information;
C. by arm processor module 1035 user is arranged parameter and send field programmable gate array module and digital signal processor module to, and receive the status information of the analysis result FPGA module of DSP module, then with analysis result with status information is preserved and show by LCD display circuit 1034.
The specific implementation method of field programmable gate array module 1031 is as shown in Figure 2 among the step S2:
Field programmable gate array module 1031 receives the information-setting by user that arm processor module 1035 transmits, method by look-up table reads the sine value of storing in the DDS waveform generation module, the triangular wave that produces with digital triangular wave generation module relatively draws in SPWM and PWM generation module and obtains A and export (wherein the SPWM ripple is produced by natural sampling method) mutually then, then A is mutually 180 ° of delay acquisition B and exports mutually.
Two-way SPWM signal drives two pairs of metal-oxide-semiconductors on the H bridge in the DC TO AC power circuit 10114 respectively, and the signal of output is through obtaining sinusoidal ac signal after the LC filtering; The two-way pwm signal drives two pairs of metal-oxide-semiconductors on the H bridge in the DC TO DC power circuit 10113 respectively, the busbar voltage behind the adjustment commercial power rectification.
SPWM and PWM all leave the dead band, namely take to delay time conducting and bilateral symmetry The dead time mode, make behind a pair of metal-oxide-semiconductor reliable turn-off on the same brachium pontis, a pair of metal-oxide-semiconductor on another brachium pontis is just open-minded, avoid the conducting simultaneously of two pairs of metal-oxide-semiconductors of H bridge and short circuit, and SPWM ripple and PWM ripple drive signal all through inserting two pairs of metal-oxide-semiconductors on the H bridge after the optocoupler electrical isolation, improve the antijamming capability of system.
Meanwhile, field programmable gate array module 1031 detects the voltage amplitude value that DC TO DC power circuit 10113 is exported direct currents by the high-speed ADC converter, can control busbar voltage in real time by adjusting the PWM dutycycle, keeps the stable of busbar voltage.Detect alternating voltage, the current peak of 10114 outputs of DC TO AC power circuit by the high-speed ADC converter, when voltage, when current peak is unusual, turn off SPWM, PWM and drive signal at once, and send warning information to arm processor module 1035, to prevent that metal-oxide-semiconductor from burning out, guarantee security of system work.
In operational process of the present utility model, field programmable gate array module 1031 is then adjusted rotation speed of the fan by the temperature of the power circuit in the temperature sensing circuit 1012 detection inverter core circuits 1011 when temperature is too high, accelerate heat radiation.Be higher than setting value and work as temperature, then send high temperature warning information and cut-off signals output protection circuit to arm processor module 1035.The abnormal monitoring of the inverter core circuit 1011 of FPGA and interruption control are followed the start of whole device and are moved two duties.
The specific implementation method of digital signal processor module 1032 is as shown in Figure 3 among the step S2:
Digital signal processor module 1032 is collected voltage, the current sampling data that data acquisition module 1014 transmits, carry out time-domain analysis after the preservation, obtain voltage root mean square (Vrms), electric current root mean square (Irms), voltage peak factor (CFU), current peak factor (CFI) and power factor (PF) (PF) parameter, then sampled value is carried out the algorithm pre-service, carry out frequency-domain analysis, obtain fundamental frequency and each harmonic content.
Digital signal processor module 1032 is finished after the computational analysis of signal, the user that these analysis results and arm processor module 1035 are transmitted arranges parameter comparison, if with user's configuration information in error range, then these data are passed to arm processor module 1035, and show by 1035 preservations of arm processor module and by LCD display circuit 1034; If DSP analysis result and user arrange parameter and differ bigger, the frequency of namely exporting sinusoidal signal surpasses the error range of setting with amplitude and the conceivable signal of user, then send look-at-me and transmit abnormal information to field programmable gate array module 1031 by the SCI interface, meanwhile send warning information to arm processor module 1035, the field programmable gate array module is received frequency and the amplitude of adjusting sine wave output after the information by the degree of modulation of adjust frequency control word and SPWM ripple.
Above-described embodiment is preferable embodiment of the present utility model; it should be understood that; above-described embodiment is not limited to the utility model; those of ordinary skill in the art is under the situation of the aim that does not break away from principle of the present utility model; variation, modification, replacement and distortion to above-described embodiment is made all should fall within the protection domain of the present utility model.
Claims (7)
1. an AC power digital platform able to programme is characterized in that, comprises successively the inverter that connects and signal acquiring system, numerical control and display platform system, heat abstractor, wherein:
Inverter and signal acquiring system comprise temperature sensing circuit, the inverter core circuit, LC filtering circuit and the data acquisition module that connect successively;
The inverter core circuit comprises full bridge rectifier, power factor (PF) circuit for rectifying, DC TO DC power circuit and the DC TO AC power circuit that connects successively;
Numerical control and display platform system comprise field programmable gate array module, digital signal processor module, key circuit, LCD display circuit, arm processor module and communication interface circuit;
Field programmable gate array module, digital signal processor module and arm processor module link to each other in twos, form closed-loop control system; The digital signal processor module is connected with data acquisition module; Heat abstractor, temperature sensing circuit and field programmable gate array module are formed closed-loop control system, and the power factor (PF) circuit for rectifying in the inverter core circuit, DC TO DC power circuit, DC TO AC power circuit all are connected on the field programmable gate array module.
2. AC power digital platform able to programme according to claim 1, it is characterized in that, described data acquisition module comprises Hall element, signal conditioning circuit and the high-speed A/D converter that connects successively, and Hall element comprises Hall voltage sensor and Hall current sensor.
3. AC power digital platform able to programme according to claim 1 is characterized in that, described heat abstractor is fan.
4. AC power digital platform able to programme according to claim 1 is characterized in that, described display circuit is the LCD display circuit.
5. AC power digital platform able to programme according to claim 1 is characterized in that, field programmable gate array module, digital signal processor module and arm processor module all link to each other in twos by the SCI interface.
6. AC power digital platform able to programme according to claim 1 is characterized in that, communication interface circuit is a kind of or several combination arbitrarily among RS232, USB, GPIB, the Ethernet.
7. AC power digital platform able to programme according to claim 1 is characterized in that, the digital signal processor module links to each other with data acquisition module by the SPI interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320062703 CN203038049U (en) | 2013-02-04 | 2013-02-04 | Programmable AC power source digital platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320062703 CN203038049U (en) | 2013-02-04 | 2013-02-04 | Programmable AC power source digital platform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203038049U true CN203038049U (en) | 2013-07-03 |
Family
ID=48690156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320062703 Expired - Fee Related CN203038049U (en) | 2013-02-04 | 2013-02-04 | Programmable AC power source digital platform |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203038049U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103356183A (en) * | 2013-07-05 | 2013-10-23 | 中国科学院深圳先进技术研究院 | ECG acquisition platform |
| CN106059350A (en) * | 2016-05-31 | 2016-10-26 | 东莞市思普电子有限公司 | AC wide-frequency conversion power supply |
| CN117750577A (en) * | 2023-12-21 | 2024-03-22 | 青岛豪江电子科技有限公司 | High-power square wave output circuit for programming and detecting LED driving power supply |
-
2013
- 2013-02-04 CN CN 201320062703 patent/CN203038049U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103356183A (en) * | 2013-07-05 | 2013-10-23 | 中国科学院深圳先进技术研究院 | ECG acquisition platform |
| CN103356183B (en) * | 2013-07-05 | 2016-02-17 | 中国科学院深圳先进技术研究院 | ECG acquisition platform |
| CN106059350A (en) * | 2016-05-31 | 2016-10-26 | 东莞市思普电子有限公司 | AC wide-frequency conversion power supply |
| CN117750577A (en) * | 2023-12-21 | 2024-03-22 | 青岛豪江电子科技有限公司 | High-power square wave output circuit for programming and detecting LED driving power supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103207578A (en) | Digital platform for programmable alternating current power supply and control method of digital platform | |
| CN101149425B (en) | Electronic electric energy meter debugging, checkout automated system | |
| CN204425298U (en) | A kind of faint AC signal amplitude lock-in amplifier | |
| CN204008751U (en) | Frequency conversion experiment power supply system in wind-power electricity generation machine testing | |
| CN103439679A (en) | Absolute time delay detection device and method of intelligent substation mutual inductor data collection system | |
| CN201860111U (en) | Reactance controlling device of dynamic harmonic filter | |
| CN203038049U (en) | Programmable AC power source digital platform | |
| CN101956578A (en) | Vibration data collection and fault analysis system of networking portable type steam turbine set | |
| CN112910098A (en) | Novel open-source real-time testing platform for motor frequency converter | |
| CN201859178U (en) | Metering device for harmonic electric energy | |
| CN101458275A (en) | High temperature resistant three phase intermediate frequency electric quantity acquisition module | |
| CN203216993U (en) | Power-grid harmonic real-time online monitor | |
| CN110058100A (en) | A kind of the Time delay measurement method, apparatus and system of DC transmission system | |
| CN204205923U (en) | Wind-powered electricity generation Variable flow control system | |
| CN202721612U (en) | Intelligent frequency-conversion variable-voltage test power supply | |
| CN204556726U (en) | A kind of power panel three-phase ac signal frequency detecting device | |
| CN204597786U (en) | A kind of variable frequency power supply based on IGBT | |
| CN203206121U (en) | FPGA-based frequency conversion AC power-supply control apparatus | |
| CN204405737U (en) | A kind of harmonic measurement device based on DSP | |
| CN106921308A (en) | A kind of Novel Three-phase Inverter and control method | |
| CN101826813A (en) | Intelligent DC/AC inverter | |
| CN201846245U (en) | Intelligent DC/AC inverter | |
| CN205787992U (en) | Constant-current source control system | |
| CN104734527A (en) | Three-phase programmable AC power supply device | |
| CN204241561U (en) | A kind of online energy monitor end device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130703 Termination date: 20140204 |