| 摘要 |
PURPOSE:To eliminate wasteful power consumption by providing a diode in the forward direction toward an output terminal of a power source stabilizing circuit, and providing a comparing means for turning off a switching element in case the voltage of a connecting point of each load is lower than the set voltage. CONSTITUTION:In case the voltage of a point P4 becomes lower than 5V, a comparator 63 generates an output. Therefore, since transistors 66, 67 are turned on and off, respectively, a current flowing through a coil 68 and the transistor 67 is disconnected as to its paths. During that time, energy is stored in the coil 68, and the moment the transistor 67 is turned off, it is brought to reflux to a power source through a diode 69 as a current. When the reflux current does not flow, the voltage of the point P4 rises and is stabilized to 5V which is set voltage. The reflux current flows to a load 41, therefore, an output current of a power source stabilizing circuit 50 is reduced by the reflux current portion. |
