With the development of digital welding inverter and soft switching welding inverter,it is vital to develop digital PWM chip to meet the demand of digital control system.

It is beneficial to the development of the digital PWM.

In order to realize a complete digital PWM control,the paper advances a digital PWM wave-generate circuit that is composed of a few common elecronic elements used in high-frequency and is able to accept directly 8 bit digital information sent out by a sigle-chip computer.

Then, flaw of existing full-digital voltage commutation method is pointed out after the change of the critical area which switch sequence will encounter corresponding to the variety of displacement angle at the input-side of converter has been explicated, then several rules have been presented and used to instruct detailed voltage commutati.

In order to overcome the current technical backward condition of blast-hole-drill in china,a full-digital DC SR system of mining blast-hole-drill is developed by using Intel 16-bit 80196CKC monolithic computer.

This paper uses TI company special-purpose on TMS320F240 type Digital Signal Processor (DSP) that controls electrical machines as the core, designs and develops software and hardware of the full-digital PMSM vector control speed adjustment system which reduces system, and elevates its availability.

As the newst alternative current transmission form,digital vector-controlling frequency-converting transmission has shown great advantage.

With the electrical-source kinds, deepply introduced three kinds electrical-source, UPS electrical-source internet, intelligent, new digital technique and the direction developping.

The all-digital target automatic tracking system of Combat Vehicle can automatically track and collect dimension information and deal with high speed target information immediately.

The all-digital design is applied to improve the performance of RCT further,including digital integrating,digital transmission,digital signal processing and digital output.

To improve the integrated accuracy of high-voltage power metering system,a type of all-digital power metering system is developed based on the high-voltage electronic instrument transformers.

Development and application of full digital plate quality management system;

The experiment results show that the full digital sensor-less VVVF system for induction motor has better performance, at the same time, the design method isproved validity and speed estimation is feasible.