| 摘要 |
A transient over-voltage protection circuit includes a normally closed switch connected between a rectifier circuit and a DC to DC converter. This switch is caused to partially open when the voltage input to the DC to DC converter exceeds a predetermined value, thereby protecting the DC to DC converter from input voltages that exceed the converter's operational limits. The switch is returned to its normally closed state when the level of voltage input to the converter drops below a predetermined lower value. A capacitor connected across the input terminals of the converter is charged up when the switch is closed and functions to supply power to the DC to DC converter when the switch is in its partially opened or current limit state. |
