| 摘要 |
In an energization circuit for a memory module, the primary energization is derived from a primary power supply source fed through an isolating diode to a regulating circuit. The regulating circuit includes a series regulator device such as a darlington amplifier. A voltage detector module is provided which is characterized in very accurate operation while drawing a negligible amount of current for its own operation. The output of the voltage detector is used to control the operation of the series regulator. A stand-by, or back-up, power supply, which may be a battery is connected to the regulator circuit through a further isolating diode. The sensing circuit for the voltage detector module is so arranged that, when the primary power supply is operational, one level of output voltage for the regulator will be required to effect a controlled operation of the voltage detector; and when the back-up power supply is operational, a different voltage level output signal is required to effect a corresponding control of the voltage detector module.
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