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Based on DSP intelligent electrical machinery protector design

August 25, 2008 – 8:29 pm
Foreword        Because the production automation and each kind of automatic control, the sequential control equipment's appearance, requests the electrical machinery to move in the frequent starting, the brake, the pro and con biography, the intermittence as well as changes frequently the load and so on each way. Electrical machinery's movement request is getting higher and higher. At the same time, because electrical machinery and necessary machinery continually in the same place, when the electrical machinery breaks down, affects the production system frequently. Therefore, implements the effective protection to the electrical machinery is guarantees the production system normal work an important task.        Along with science's and technology's development, in the electrical machinery protective device has used the electron protective device gradually. In overseas, at present the electron protective device already has obtained the widespread application in the electrical power system and in the electrical machinery protective device, domestic also ...

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With realizes - en.51rd.net based on the DS80C320 host from the contravariant power source supervisory system’s design

August 25, 2008 – 7:56 pm
Abstract: Introduced based on the DS80C320 host from the contravariant power source supervisory system's design proposal, from the hardware architecture, the software establishment and the antijamming measure three aspects has carried on the detailed discussion, and has carried on the introduction to the monolithic integrated circuit phase lock technique. The actual movement indicated that this supervisory system satisfies the actual need completely, the performance is good.     Key word: Monolithic integrated circuit; Contravariant power source; Phase-lock; Antijamming Introduction This supervisory system is main inverts the electrical power system design for the railroad with 4kVA/25Hz from the hot backup. 4kVA/25Hz main from the contravariant power source is the electric railway sector signaling system's key equipment, two output: 110V/1.6kVA partial voltage (A); 220V/2.4kVA track voltage (B); Two are 25Hz, and requests A permanent in advance B 90°. Because the invertor is for the important load power supply, and the load does not ...

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Realizes - en.51rd.net based on the FPGA IDE hard disk connection card

August 25, 2008 – 7:56 pm
Abstract: This article introduced one kind based on FPGA the technical IDE hard disk connection design. This card provides two to conform to the ATA-6 standard connection, used FPGA to realize two set of IDE interface function, the design has supported PIO and Ultra the DMA mode of transmission, the article stresses in the introduction realizes the IDE connection agreement concrete method with FPGA. Key word: FPGA; Hard disk; IDE connection Introduction     This article used FPGA to realize the IDE hard disk connection agreement. The system provides two sets to conform to ATA-6 the standard IDE connection, with the ordinary IDE hard disk connection, another is connected with the computer motherboard's on IDE connection. The system uses FPGA to realize the connection agreement, completes the interface data the interception, processing (is mainly in this paper data encryption) and the repeater, supports PIO and Ultra the DMA two kind ...

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Mobile communication terminal power source management principle of design

August 25, 2008 – 2:56 pm
  Abstract: The mobile communication terminal product was already popular in ours daily life, therefore, its design's secure question appears especially important. On the mobile termination product safe hidden danger biggest place - - power source management design, proposed some design idea enhances the product the security.     Key word: Mobile communication terminal; Power source management; May charge the lithium ion battery Introduction The mobile communication terminal product like GSM handset, the CDMA handset and the PHS Personal Access Phone System telephone already penetrated popularize to ours daily life, promoted China telecommunications' development, also has brought the convenience for ours life and quickly. But simultaneously, as a result of some mobile termination manufacturer's design defects, many times presented the handset to explode the offending somebody event, but caused the detonation the primary cause to lie in the power source management part design to have the flaw or the design existence ...

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With realizes - en.51rd.net based on the FPGA decision feedback equalizer’s design

August 25, 2008 – 2:56 pm
Abstract: This article has summarized the decision feedback equalizer basic principle and realizes the way, to realize the balancer to be possible satisfiedly to dispose the need, aims at the decision feedback equalizer specially the multiple structure, proposed that one kind uses the modulation design method from bottom to top, has carried on the exhaustive analysis to system's each module design, and discussed the main point which needs to pay attention. Key word: Decision feedback equalizer, DFE, FPGA, design method 1.   Introduction     When the mobile communication and the high speed wireless data communication, the multi-diameter effect and channel bandwidth's finiteness as well as the channel characteristic imperfect cause the data transmission the inevitable production intersymbol interference, becomes the influence correspondence quality the primary factor, but channel's balanced technology may eliminate the intersymbol interference and the noise, and reduces the error rate. And the decision feedback equalizer (DFE) ...

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Based on Matlab TMS320LF2407 procedure fast design

August 25, 2008 – 2:23 pm
The abstract under the Matlab/Simulink environment, designs the DSP procedure with the presente in figures and diagrams way, but reduced program design. Using Embedded Targetfor T1 C2000 the DSP tool bag, designs DSP the ADC conversion routine; Using the Simulink digital signal processing tool bag, designs the FIR filter clamour to carry on filter processing; Gives when the revision production C language procedure how to enable DSP to move correctly. The design procedure moves correctly on the TM$320LF2407A processor.Key word digital signal processing Matlab Embedded Target for TI C2000 toolbox FIR filter     TMS320LF2407 is one kind of high performance which, the low price DSP processor the TI Corporation hosts push, its processing speed achieves 30 MIPS, internal processing integrates outside RAM, Flash and the timer, but also integrated modules and so on A/D switch, PWM controller and CAN bus control unit, especially qualify in electrical machinery, power source ...

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Based on overtone compensation invertor profile control technology research

August 25, 2008 – 9:56 am
    Abstract: Introduced one kind based on the overtone compensation's invertor profile control technology, has analyzed system's principle of work, has discussed the control system parameter design method in detail, and has obtained the test result.     Key word: Overtone compensation; Invertor; Profile control Introduction The invertor is one kind of important DC/AC transducer. Weighs its performance an important target is the output voltage profile quality, a good invertor, its output voltage profile should as far as possible close sine, the total overtone distortion factor (THD) be supposed to be as far as possible small. The invertor needs to meet the rectification load frequently in the practical application, in this case uses the SPWM modulating technology merely the invertor, its output voltage profile will have the very big distortion. In order to obtain the THD small output voltage, the profile control technology obtained the enormous development in recent years. Repeatedly ...

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PDH corresponds two time group multiple connections to realize - en.51rd.net in CPLD

August 25, 2008 – 9:56 am
1 introduction     The digital multiple connection is merges the sole closed circuit digital signal two or two above leg digital signal according to the multiple connection way. According to each low order group clock's situation, the multiple connection has 3 ways: If each input leg digital signal mutual synchronization, and with this aircraft timing signal also synchronization, then the adjustment unit only need adjust the phase, this is the synchronized multiple connection; If input leg digital signal not synchronization, and with this aircraft timing signal also asynchronous, then the adjustment unit must carry on the frequency and the phase adjustment to various legs signal, causes it to become the synchronized signal, this is the asynchronous multiple connection; If the input leg digital signal becomes effective instantaneous is opposite the timing signal which corresponds to this aircraft is by the identical datum speed appears, but speed any change limits ...

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Based on MCU and DSP piezoelectricity strapdown inertial navigation system

August 25, 2008 – 8:16 am
The abstract takes the inertia component's inertial navigation/guidance system by the piezoelectricity top and the piezoelectricity accelerometer, has the cost to be low, quality light, anti-impact, reliable higher merit. Is solution which the inertial navigation has studied. The article introduced that realizes the piezoelectricity strapdown inertial navigation system's platform based on TI Corporation TMS320C5410. The elaboration system's hardware and the system composition and the design, show in detail the DSP system. The HPI connection, the serial port transmission data as well as the program load from lift and so on use with to realize the method.Key word piezoelectricity strapdown inertial navigation system DSP Strapdown attitude computation Introduction     In recent years, the general scientific research worker studied each kind to reduce the piezoelectricity strapdown inertial navigation system's erroneous method, enabled the piezoelectricity inertia component's precision to obtain enormous enhancement [1]. this article to introduce one kind practical the piezoelectricity ...

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One kind of simple effective current limiting protection circuit

August 25, 2008 – 4:56 am
 Abstract: Proposed one kind of simple effective current limiting protection circuit, elaborated this protection circuit to apply in the wide scope input is stirring up the converter and the wide scope input instead stirred up when the converter the working condition difference, and gave one to be suitable for the wide scope input instead stirs up converter's compensating circuit. The final experimental result has confirmed the current limiting protection circuit and compensating circuit's principle of work and the validity.     Key word: Overflow protection; Just violent; Counter-violent Introduction The overflow protection circuit is in the power source product an essential constituent, may divide into the shutdown way and the current limiting way approximately according to its control method. Because the current limiting way it has the electric current sagging characteristic, after the breakdown relieves, the switching power supply can the self-recovery work, therefore, obtains the quite widespread application.    The current ...

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