| 摘要 |
PURPOSE:To realize not only a stabilized operation even in a heavy load but a self- starting in case when a battery is applied, by driving both the normal and heavy through a voltage reducing circuit and a constant voltage circuit, respectively, and increasing the level of constant voltage when the clock stops. CONSTITUTION:The on-off of n transistors 26 and 27 of a voltage reducing circuit 10 as well as p transistors 35 and 36 is controlled via a power source control circuit 9. Then capacitors 12 and 13 having the same capacity are connected in series to a power source circuit to reduce the battery voltage down to 1/2, etc. Thus the normal load of an elapsed time circuit or the like is driven. On the other hand, the outputs of AND gates 67 and 68 of the circuit 9 are set at a low level during a heavy load, and thus the capacitors 12 and 13 of the circuit 10 are connected in parallel to be backed up for a prescribed time. After this, a heavy load of a lamp or the like is driven stably via a constant voltage circuit 8. A gate 47 of the circuit 8 is opened by a clock stoppage detecting circuit 84, and the resistance value varies by a partial pressure resistance 86 or the like to increase the level of output voltage of the circuit 8. As a result, a quartz oscillator starts with no malfunction by a high voltage even in case when a battery is applied. Thus an electronic timepiece executes a self- starting. |
