Dynamic damper and lighting driving circuit comprising the dynamic damper

摘要

A dynamic damper in a lighting driving circuit for limiting an inrush current includes a damper circuit and a timing circuit comprising capacitor. The damper circuit is connected to the timing circuit. When an input voltage is provided to the dynamic damper, the capacitor begins to be charged and the capacitance-voltage of the capacitor rises. The damper circuit enters to a first working state and generates a dynamic damper resistor value. When the capacitance-voltage of the capacitor is greater than a first threshold voltage, the damper circuit enters to a second working state and the dynamic damper resistor value begins to decrease. When the capacitance-voltage of the capacitor is greater than a second threshold voltage, the damper circuit enters to a short-circuit state, and the dynamic damper resistor value decreases to zero to facilitate the normal work of the power source converter.

主权项

1. A dynamic damper for limiting an inrush current, comprising:
a timing circuit, comprising:
a first capacitor having a first end of the first capacitor and a second end of the first capacitor, the second end of the first capacitor is connected to ground;a current source having a first end of the current source and a second end of the current source, the first end of the current source connected to the first end of the first capacitor; andan one-way conductive element connected in parallel to the current source, wherein a conductive direction of the one-way conductive element is opposite to a current direction of the current source, wherein the current source and the first capacitor forms a charging loop, the one-way conductive element and the first capacitor forms a discharging loop, when an input voltage is provided to the dynamic damper, the first capacitor is charged by the charging loop, and when the input voltage is zero, the first capacitor begins to be discharged by the discharging loop; and a damper circuit connected to the timing circuit, when the first capacitor begins to be charged, the damper circuit enters to a first working state and generates a dynamic damper resistor value, when a capacitance-voltage of the first capacitor is greater than a first threshold voltage, the damper circuit enters to a second working state and the dynamic damper resistor value begins to decrease, and when the capacitance-voltage is greater than a second threshold voltage, the damper circuit enters to a short-circuit state and the dynamic damper resistor value decreases to zero.