Ultrasonic welding machine power device experiences by tube - process of thyristor field effect transistor, tube size, power consumption is very big also;Can turn off thyristor switch speed is low and the gate shut off the electric current is big, drive power;Bipolar transistor to a larger drive current;Large power field effect tube conduction impedance and insulated gate bipolar transistor IGBT possesses the advantages of bipolar and field-effect transistor, small switch loss, high voltage, large capacity, current density, low on state voltage, so the discussion into power equipment ideal switch components adopt IGBT as the power device, using 8098 single chip microcomputer to generate SPWM switch signals and end frequency active Shadowed 1 switch principle of single chip microcomputer end SPWM signal sequences have natural sampling and sampling rules two methods.Natural sampling is a sine wave and triangle wave cross intersection of judges SPWM sequence of concave and convex level, the shortcoming in use brief analytical formula describing pulse width calculation.

   Can't end the microcomputer real-time control of SPWM waveform.Rules sampling is a sampling value decided that with pulse width h as shown below.Meanwhile, t2 = I + Msinkt (l), T for the triangular wave cycle, namely SPWM switch cycle, M is the ratio of the sine wave amplitude and the triangle wave amplitude value of k to sine wave frequency microcontroller SPWM sequence using this algorithm, but when processing the data, to reduce switching time,  progress switch frequency, can choose the deposit table of 360 plan, the SPWM waveform data stored in E PROM2764, operation look-up table to take the sequence pulse width control Erfc programmable 1 dozen, and suspend the work s can end, its principle as shown in 2 system hardware circuit diagram of SPWM is fundamental to suspend the time switch cycle, a punctual punctuality is radically suspend the function of service program is punctual to the device into the time constant, a punctual operation.

    1 in the tr, H "! Stop 1 to suspend the punctual punctuality 2 1 SPW.; M sequence control method program for SPWM pulse 1 function is rising along the processing, and punctual to implement into pulse width time constant, punctual to start homework, to suspend the program function is to deal with lower edge of 2 through to suspend the program 1 and suspended 2 processing is a pulse generation and manipulation of the end, the punctual to suspend the handling method is characterized by a switch cycle domestic demand two suspension, and the CPU response and handling these to suspend the program cost a lot of time, thus to restrain the progress of SPWM switching frequency using 8098 single chip microcomputer high-speed output channel (HSO) to generate and output SPWM sequence, the characteristics of the principle as shown in b HSO is under the condition of minimum CPU time spending trigger user setting things, things the trigger point and suspend or not by the user via the HSO organization in manipulation of the instruction set, the CPU of things, no longer participate in the operation of the HSO things, thus with HSO is very suitable for real-time generation and output SPWM sequence HSO in real time to generate SPWM method is written to the entrance of the fundamental to suspend the service program a HSO instruction, punctual to launch the software operation, so that the CPU after T punctuality again into the suspension of service program, and then according to the calculation of the pulse width of time t2, the HSO output channel separation into 2 instruction, so just make a suspension can output SPWM sequence, compared with a shows two aborted can you improve the switch frequency.

    23 frequency active the four power device of the power converter for the whole bridge circuit, 2 Gi and G2G3 switch of IGBT tubes for complementary operation condition, through the HSO. O output, signal separation by reverse phase delay composition 2 road driving Gi and G2G ultrasonic plastic welding machine normal operation conditions is the frequency of the acoustic system active scrutiny, the generator of the input signal frequency is equal to the transducer mechanical resonance frequency.Research plan of frequency active Shadowed circuit using balanced bridge reaction principle of current signal through the transducer, the resonant frequency and ultrasonic source frequency resonance occur when together, the current signals in response to the plastic, expanding into the single chip microcomputer 8098, through A/D converter transform processing, to find the best working frequency, by HSO. 0 output operation frequency, triggered by reverse phase, drive IGBT tubes, the system oscillation frequency approaches to the optimal resonance condition 3 system software programming and use system program first generated by the main program, SPWM sequence and frequency active Shadowed program, as shown in the composition such as the completion of the main program first initialization, pointer setting, set to suspend the manipulation of words, sine table look-up table address, frequency active Shadowed to suspend the program entry.SP - WM sequence generator primary end sine table look-up table, pulse width, and accounting and update frequency of the sine table address active Shadowed end program first launched A/D transformation digital filter and find the best frequency, etc.Turn the main program block diagram under the first well end page pAcademi plastic ultrasonic welding machine for plastic parts and plastic parts to connect the instances of when harmonic oscillation oscillation from the plastic workpiece end to the other end, lead to touch on the surface of the plastic parts plastic particle oscillation, happen a lot of friction heat, in a short time to agile warming plastic melting point, under the effect of pressure, upper and lower artifacts closely touch and fusion, and then weld end 7 conclusion the damage of cold rolling torsion reinforced concrete flexural members belongs to the ductile damage type.

    Function index of the cold-rolled and twisted bars, especially elongation e1 (fc 4.5%, the tensile strength/y = 360 n/was planning values, has guaranteed the safety of the structure (components) secure function index value of cold-rolled and twisted bars scientific and reasonable, the quality assurance system, convenient operation, stable product quality of cold-rolled and twisted bars function remains to be further optimized, especially the progress of the elongation of 115-97, technical specification for concrete member cold-rolled and twisted bars | SI. 3 | GB68-84, building construction planning and unified standard. | SI (editor qiu-juan zhang) (on page 815) 4 knot power generator USES 8098 single chip microcomputer HSO. O output switch signals, to the end frequency active scrutiny, and Shadowed precision chooses 8098 single chip microcomputer control system, outstanding features, strong research and development of the ultrasonic power generator operation can be widely used in ultrasonic plastic welding equipment.