51 Research and Design, Electronic Engineers website - Embedded Systems, MCU, DSP, EDA, Test and Measurement, Components, Communications, Power, Microelectronics, Semiconductors

Monday, October 5th, 2009 at 12:57 | No comments

Categories: DSP

Tags: A/D, connection, design, DSP, invertor

Short Content: O introduction    Switching power supply toward high efficiency, high stability, high power density, low pollution, modular development. Each kind of new analysis situs electric circuit and the technology also obtained the application. Resonant and the soft switch technology's application also causes the mains input density to be able to enhance. The power source controls, the control circuit, the driving circuit, the protection circuit used integrate the module to reduce power source's design difficulty. High speed microprocessor DSP (Digital Signal Processing ...

Sunday, October 4th, 2009 at 10:17 | No comments

Categories: DSP

Tags: frequency changer, invertor, overtone distortion factor, SPWM, Switch, TMS320LF2407

Short Content: Sees the AC/DC/AC frequency changer, is carries on the frequency conversion, the live pressure adjustment to the output unit, moreover in many kinds of inversion control technology, applies the most widespread one kind of inversion control technology is the sine pulse-duration modulation (SPWM) technology. In the frequency conversion velocity modulation system, realizes the numerical control using DSP as the control chip, it both enhanced the system reliability, and causes system's control precision to be high, timeliness is strong, the hardware ...

Thursday, April 9th, 2009 at 21:09 | No comments

Categories: Power Supply

Tags: IGBT, invertor, PCB, Power source

Short Content: Abstract: Has analyzed in three level invertor system the IGBT driving circuit's main noise source and the coupling way, based on this design's some questions has conducted the research to lGBT driving circuit EMC, discussed the fiber optic transmission signal, the accessory power supply design, transient state noise abatement as well as PCB questions with emphasis and so on antijamming design, and has given the design proposal.Key word: Three level invertors; IGBT driving circuit; Electromagnetic interference; Electromagnetic compatibility 0 introductions    ...

Wednesday, February 18th, 2009 at 19:02 | No comments

Categories: Power Supply

Tags: invertor, multi-link feedback, numerical control

Short Content: Abstract: Has adjusted the UPS invertor's output using more than a link reaction control strategy. Has analyzed this kind of control policy time domain and the frequency range characteristic. Finally has given the simulation and the experiment profile, finally had proven this control method has the very good control effect to the linear load and the rectification bridge load.Key word: Invertor; Multi-link feedback; Numerical control 0 introductions    In the past stressed to invertor's research in uses the new high frequency ...

Tuesday, February 10th, 2009 at 21:02 | No comments

Categories: Power Supply

Tags: invertor, numerical control, Power source, Three-phase

Short Content: Abstract: To the three-phase UPS system's various modular circuit analysis situs, the circuitry structure as well as each kind of popular control policy have made a concise evaluation, had pointed out in the UPS design and the application exists the question and the current research's new hot spot, has made the prediction finally to the UPS development trendKey word: Three-phase UPS; The invertor is parallel; Numerical control O introduction    In next quite long period of time, our country city electricity ...

Tuesday, February 3rd, 2009 at 08:53 | No comments

Categories: Power Supply

Tags: high-voltage power supply, invertor, phase compensation, Phase track, series resonance, static electricity dust removal

Short Content: Abstract: Introduced the traditional series resonance power source's principle of work, has analyzed its phase track technology shortcoming, gave has affected its phase track several factors. According to invertor deviation resonance point when the after flow diode existence after flow, proposed the improvement to the traditional phase track technology. The experiment proved that after the improvement phase track technology effect was obvious, had guaranteed the invertor work nearby the resonance point, enhanced the static electricity dust removal to use the ...

Monday, February 2nd, 2009 at 07:53 | No comments

Categories: Power Supply

Tags: invertor, Power source, sine pulse-duration modulation, The single-phase, TL494, vehicle carries

Short Content: Abstract: Introduced one new single-phase sine vehicle carries the power source, this power source produces the sine pulse-duration modulation signal by the single chip, realizes from directs current 12V to exchange the 220V/50Hz transformation. Has given power source's system structure drawing, the multianalysis its main part's function, and has given the experimental result.Key word: Sine pulse-duration modulation; Invertor; The vehicle carries the power sourceO introduction    Along with society's development, the automobile more and more is closely linked with people's life, ...

Thursday, January 29th, 2009 at 13:53 | No comments

Categories: Power Supply

Tags: compensates the, invertor, series-parallel connection, The three-phase, UPS

Short Content: Abstract: Narrated this kind of UPS principle of work and the control mode, proposed the control mode may realize the series-parallel connection compensation type UPS completely control function, in the supply voltage is not a rated value, and includes the harmonic voltage, the load to include the harmonic current and in the idle current situation, the mains input electric current is accused makes the sine, the power factor is equal to 1, the load voltage is accused makes the rated ...

Thursday, January 29th, 2009 at 03:53 | No comments

Categories: Power Supply

Tags: Entire bridge inversion, invertor, SPWM, unipolarity, zero crossing vibration

Short Content: Abstract: The unipolarity entire bridge inversion is opposite in the bipolarity inversion loses lowly, the electromagnetic interference are few, unipolarity SPWM is suitable for the contravariant control, but this control mode has a zero crossing vibration. Introduced the unipolarity inverts the bilateral SPWM control method, has analyzed this control method in the sine wave voltage zero crossing nearby oscillatory occurrences, proposes one kind of solution zero crossing vibration plan, and after experimental verification.Key word: Entire bridge inversion; Unipolarity; Sine wave ...

Wednesday, September 10th, 2008 at 23:35 | No comments

Categories: DSP

Tags: control system, DSP, invertor, UPS

Short Content: 1 introduction    Along with information processing and management technology's unceasing development, particularly computer's widespread application and the Internet rapid development, power supply system's reliable request is getting higher and higher, therefore (UPS) technical specification's request is also getting higher and higher to the UPS. The UPS hard core is a permanent frequency constant pressure invertor, because the tradition analogue control needs to use the massive separation primary device, the aging and floated warm the serious influence system's long-term stability. Can ...