| 摘要 |
The present invention discloses a constant current source circuit with energy saving and over voltage protection to provide a constant current source circuit with fewer elements, simple circuitry, energy saving and over voltage protection. The present invention includes a regulating circuit (1), a filtering capacitor (2) and a load (3), and further includes a depletion mode FET (field effect transistor) (4). The present invention can generally be applied to lamps, wherein the load is high voltage LED (light emitting diode) elements, or a lamp composed of several LED elements connected in series or serial-parallel connected. This invention can also be applied to an electronic circuit with high working voltage. This invention can also be applied to a DC motor with high working voltage. This invention can also be applied to an electrical thermal load with high resistivity.
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