four weeks-wave modulation

,franklin marshall milano
Spread-spectrum communication technology in welding application


Port unit consists of a bandpass filter and the output voltage of the rectifier welding machine parts,abercrombie copenhagen, with a filter band-pass filter is not only clutter,ed hardy rea, but also to ensure impedance matching between before and after class,abercrombie københavn, in order to achieve the purpose of successfully passing the signal . As the main crystal frequency different carrier frequencies are different; modulation frequency for different data transfer rate and bandwidth are different. Therefore,ed hardy, the filter parameters are not in the main oscillator frequency will also change. The study design of the carrier remote control use a 10MHz crystal frequency,abercrombie paris, data rate 1kbps,franklin and marshall sale, four weeks-wave modulation,franklin marshall outlet, 250kHz carrier frequency,ed hardy suomessa, bandwidth of 100kHz (200-300kHz). Carrier for remote control filter circuit shown in Figure 4. Welding letter was received n number of a falling tone J == control system Wu falling ● a) [Wu motor key source of core fall <- a fall eleven Wu Wu carrier remote control device structure in Figure 3 Fig. 3Structureofcarrierremotecontrolinstallment 1.6nFI. 1.6nFOUTz ‰ 4 carrier for remote control filter circuit Fig. 4Filtercircuitofcarrierremotecontrol hardware design focusing on the signal isolation, the parameters of discrete choice, chip drive capability and the reliability of the carrier remote control. Power supply unit should ensure that good buck while minimizing interference in selection of voltage regulator chips UPC7805, conjugate with the input filter ring, for the MCU and SC1128 to provide a stable power supply. Because the smaller carrier remote control, heat dissipation should be fully considered in the choice of the associated resistors, capacitors, transistors, carefully analyzing their power consumption at maximum load parameters. Display unit 8 by the three common anode LED to complete, and the MCU with dynamic scanning mode parallel transmission of data through the 74HC573. Key research and design of public use Omron hail Hui pulled Vol.36 Division B3W a 1042 series of products to ensure reliability. 3-3 Software System Design (1) around the chip and the software part of the communication to complete the SC1128, the main program flow shown in Figure 5. To better understand the process control section, Figure 6 of the carrier remote control panel local map, press the button assigned Figure 5 The main program flow Fig. 5Proceedingofmainprogram (2) SC1128 and MCU communication. SC1128 transmit or receive data through the SR (transmit / receive control side), TX (transmit / receive data terminal) and SYN (transmit / receive synchronization pulse end) 3 side of. SR = 0 circuit in the receiving state, SR = I circuit in the firing state. ① launch status. When SR = 1, transmit / receive synchronization pulse output terminal SYN sync pulse. When the circuit is fired when the circuit within the SYN on the edge of the TX-ended input data latch, so the external MCU should maintain a SYN on the edge of the data does not change the TX side, and the next hop along the SYN can gives the emission data. The specific sequence shown in Figure 7. Receiving state. When SR = 0, the circuit in the receiving state, SYN client will not immediately sync output pulse only when the circuit is the received data with the circuit OO ⑧ Figure 6 increase to reduce the send local remote control panel Fig. 6Controlinterfacelocalofremotecontrollern Ji n few nn Jiji launch timing waveform in Figure 7 Fig. 7waveformoflauchsuccessionSYN edge at the output terminal to receive data from the TX side latch output, and held until the next positive edge, the MCU should SYN sync pulse after the next hop along the read data from the TX side. The specific sequence shown in Figure 8. In Figure 8, when the SR just as low, SYN output is low. s: Factory is not synchronized synchronized; sYNl1IT puzzle Kou marrow circle C is to receive the timing waveforms in Figure 8 Fig. 8waveformofreceivesuccession4 chip SC1128 and conclusion spread spectrum communication with the MCU application, making the carrier remote control anti-interference ability, and versatile and can be expanded, interactive interface is good. Application of new technologies effectively address the shortcomings of traditional wired remote control, with great promotional value. References: [1] Wang. Communication Theory A Concise Guide groan Beijing: Electronic Industry Press, 2O05

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