| 摘要 |
PURPOSE:To eliminate the need for a D/A converter and to simplify the constitution of a digital servo control method by producing the driving PWM pulse from the PWM pulse given from a control arithmetic part and using the driving PWM pulse to drive a power transistor. CONSTITUTION:As shown in the diagram, the PWM pulse (a) and the plus/minus pulse (b) are available for the output of a control arithmetic part 1. These pulse signals are processed properly and used as the base signal of a power transistor. As a result, both transistors (TR) T1 and T4 are turned on at a time point t0 and the current increases. Then the TR T1 is turned off at a time point t1 and therefore the current flows to a diode D2 by the energy stored in the reactance of a motor. Thus the current decreases. The TR T1 is turned on again at a time time point t2 and the current increases. Then a TR T4 is turned off at a time point t3 and the current flows a diode D3. |
