US Patent No. 10,342,089

CONSTANT CURRENT DEVICE AND HEAT DISPERSION MODULE THEREOF


Patent No. 10,342,089
Issue Date July 02, 2019
Title Constant Current Device And Heat Dispersion Module Thereof
Inventorship Chen-Chi Lin, New Taipei (TW)
Assignee CHICONY POWER TECHNOLOGY CO., LTD., New Taipei (TW)

Claim of US Patent No. 10,342,089

1. A constant current device with adaptive distribution of power dissipation, used for stabilizing a current of a light emitting unit, the light emitting unit being electrically connected to a power supply, the constant current device comprising:a current regulating unit, which is electrically connected to the light emitting unit; and
a first heat dispersion module, comprising:
a first impedance element, which is electrically connected between the current regulating unit and a ground;
a first detection control unit, which is electrically connected to the light emitting unit, for detecting a node voltage value between the light emitting unit and the current regulating unit;
a first switch unit, which is electrically connected to the first detection control unit, the current regulating unit and the ground, the first switch unit being controlled by the first detection control unit to switch between an on-state and an open state according to the node voltage value; when the first switch unit is in the on-state, a current of the current regulating unit is conducted to the ground via the first switch unit; when the first switch unit is in the open state, the current of the current regulating unit is conducted to the ground via the first impedance element; and
a first feedback unit, which is electrically connected between the first switch unit and the first detection control unit, causing the first switch unit to exhibit hysteresis when changing between the on-state and the open state.