| 摘要 |
PURPOSE:To reduce the power loss of Darlington transistors by a method wherein the primary winding in a coil is connected to a DC motor circuit and voltage is supplied to the initial stage transistors of the Darlington transistors from the secondary winding in a coil. CONSTITUTION:In a driving control circuit 1, a DC motor M is connected to a power source 4 through a control circuit 2 and a motor circuit 3. In the control circuit 2, transistors Tr1, TR3 for positive and negative rotation, and speed control transistors Tr2, Tr4 are connected and transistors Tr5-Tr8 are connected to each transistor Tr1-Tr4 in Darlington form to gain current amplification factor. Furthermore, the motor current is smoothed by connecting the primary winding in a coil to the motor circuit 3 and the power loss of Darlington transistors is reduced by supplying a voltage to the transistors Tr5, Tr7 from the secondary winding in the coil. |
