The article uses SPCE061A sheet piece machine regard numerical control dc as current source advocate control a part, through clever software design and simple and easy and reliable hardware circuit close suitably, came true to export electricity but beforehand buy, but the pace is entered adjust, signal of output electric current can show directly and the function such as speech clew. The system adopted closed-loop control plan, the electricity that exports actually the value carries accurate resistor sampling to feedback, classics PID algorithm revises actual output cost, increased the output precision of current source and stability.

Often use stability in electronic equipment good, precision tall, output but beforehand the dc current source of buy. Because of,the current source of numerical control dc that the article designs can be reduced well yuan the output error that the reason such as ageing of parts of an apparatus, Wen Piao causes, output electric current is in 20mA ～ 2000mA is adjustable, output electric current but beforehand buy, have“Pace of ” , “-” is entered adjust, signal of output electric current can show directly and the function such as speech clew. Hardware circuit uses Ling Yang sheet piece machine SPCE061A is control core, use closed-loop control principle, add feedback circuitry, make whole circuit makes a closed circuit, basically use PID algorithm to realize the accurate control to exporting electricity in software side. This system dependability tall, bulk small, operation is simple interface of convenient, man-machine is friendly.

Systematic hardware implements plan

This design uses sheet piece machine as main control unit, buy outputs electric current to be worth and use liquid crystal module to show in real time beforehand through clavier. Part of whole system hardware by small controller, voltage - voltaic changeover, clavier, show, the module composition such as dc regulated power supply and speech clew. If the graph is shown 1 times,the system comprises block diagram. Origin: HTtp://www.tede.cn

Origin: HTtp://tede.cn

Graph the origin of basic module block diagram of current source of dc of 1 numerical control: WWw.tede.cn

Small controller is the core of whole system, of responsible and whole system run. Simplify to come true performance of hardware circuit, system is stable and reliable, facilitating implementation speech sows newspaper, clavier to show the harmony that waits for a function of setting and information in real time, after be being proved through a variety of plan, small controller chooses the SPCE061A of Ling Yang company, this are odd a machine interior is compositive have the circuit such as ADC, DAC, PLL, AGC, DTMF, LCD-Driver (concern) with IC model. It uses compact instruction part (RISC) , instruction cycle all is an unit with CPU clock number. Additional, it still holds DSP function concurrently, 16 hardware multiplier mixes buy inside adder, distribute the special statement that stock DSP has, quickened all sorts of algorithmic traversal speed greatly. Can use Ling Yang sheet below Windows environment at the same time piece machine application development tool, language of C of level of this tool support and approach this world are odd a machine assembly language, collect collection, process designing, emulate wait for a function at an organic whole, accelerated software to develop a process greatly. With this sheet piece machine compare as controller appropriate, in hardware circuit simple premise falls, realize the function such as operation of clew of A/D and D/A changeover, speech, PID easily.
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