Full wave low flicker LED light string

摘要

A split bridge circuit for rectifying the alternating current house supply into direct current (D.C.), using hi-polar transistor as rectifying devices. Using specified terminals of the bi-polar transistors results in a high forward voltage drop across the transistors (particularly as compared to the voltage drop across diode rectifiers in the prior art circuits), which reduces ripple significantly and lessens, or even eliminates, the need for a series limiting resistor in the circuit.

主权项

1. A series wired light string comprising:
(a) at least 30 light emitting diodes (LED's) connected in electrical series; and (b) a split bridge rectifying circuit for powering the series connected LED's, the split bridge rectifying circuit comprising:
(i) a first half bridge rectifying circuit formed of two transistors as rectifying devices, using only the emitter and collector terminals of the transistors, with the base terminal not connected, and(ii) a second half bridge rectifying circuit formed of two transistors as rectifying devices, using only the emitter and collector terminals of the transistors, with the base terminal not connected;wherein the series connected LED's are connected between the first and second halves of the bridge rectifying circuit, andwherein the first half bridge rectifying circuit is connected to a first AC plug and the second half bridge rectifying circuit is connected to a second AC plug.