| 摘要 |
PURPOSE:To automatically and smoothly switch 4-quadrant operations by supplying a signal obtained by integrating an error between a motor terminal voltage and a reference voltage through comparators having difference upper and lower limit values to switching elements connected in a bridge. CONSTITUTION:An integrator applies a signal v obtained by integrating an error between the terminal voltage va of a motor M and a set value E1 to hysteresis comparators 1-4. The comparators 1-4 have different upper and lower limit values, and compare the signal vc with the upper and lower limit values, respectively. The outputs of the comparators 1-4 are supplied through flip-flops 1, 2 to transistors Tr1-Tr4 connected in a bridge. Thus, the voltage controls of 4-quadrant choppers can be accurately performed. |
