| 摘要 |
PURPOSE:To eliminate the coexistence of two outputs and to obtain the constant voltage, by avoiding the generation of the output of one side until it is detected that the output of the other side is reduced down to a certin level during a switching action of the power supply and at the same time by incorporating a constant voltage power supply. CONSTITUTION:Both transistors (TR)1 and 2 function as switching elements. The 1st control circuit is formed with an amplifying circuit A1, the TR1 and an amplifying circuit A2; while the 2nd control circuit is formed with an amplifying circuit A3, the TR2 and an amplifying circuit A4. When the voltage emerges at an outputIand exceeds the level of the voltage of a comparing voltage source VT1, the outut of an NAND circuit 3 is set at ''1'' by the output of a control input terminal Vc. A TR4 is turned on to set the plus terminal of the circuit A3 at 0. Then the TR2 is turned off, and an output II is set at zero potential. When the output voltage exceeds a certain level, the impedances of the TR1 and TR2 increase to set the voltage at a certain level. |
