| 摘要 |
<p>A power supply for regulating energy delivered to a power consuming apparatus (12) operating at low current levels includes a power source (16) comprising at least one battery for generating an output voltage greater than a desired operating level. The power supply further includes a voltage regulator circuit (R1) comprising a light emitting diode (LED)(D1). The light emitting diode, which is preferably configured as a gallium arsenide diode, operates at a substantially constant voltage within a current range of between 10 to 25 micro amps. As a result, reliable and economical voltage regulating circuits can be constructed with substantially improved performance, as compared to circuits utilizing zener diodes as the active voltage regulating component, at the very low current levels required for such applications as line powered telecommunication devices.</p> |
