Light indicating system having light emitting diodes and power reduction circuit
First Claim
1. Apparatus for controlling a component operated by low voltage direct current in response to actuation of a device operated by high voltage alternating current, said apparatus comprising rectifying means including a silicon controlled rectifier connected to said direct current operated component and to said alternating current operated device, said rectifying means being effective to rectify the alternating current received from said device into direct current for said direct current component, said direct current component being connected through a resistor to said rectifier for limiting the direct current through said component, said component being connected to said device through a diode, and voltage phase control means for limiting conduction of the rectified current through said component and said resistor for limiting the heat produced by said resistor.
0 Assignments
0 Petitions
Accused Products
Abstract
A light indicating monitoring system includes a plurality of light emitting diodes (LED'"'"'s) having a common ground connected to a phase controlled silicon controlled rectifier (SCR) circuit. The SCR circuit limits conduction of rectified AC energy through the LED'"'"'s and through corresponding resistors connected in series with the LED'"'"'s for limiting the current through the LED'"'"'s. The SCR circuit thereby provides for operating low DC voltage LED'"'"'s from a high AC voltage source with a minimum of power and heat generation in the current limiting resistors.
147 Citations
9 Claims
- 1. Apparatus for controlling a component operated by low voltage direct current in response to actuation of a device operated by high voltage alternating current, said apparatus comprising rectifying means including a silicon controlled rectifier connected to said direct current operated component and to said alternating current operated device, said rectifying means being effective to rectify the alternating current received from said device into direct current for said direct current component, said direct current component being connected through a resistor to said rectifier for limiting the direct current through said component, said component being connected to said device through a diode, and voltage phase control means for limiting conduction of the rectified current through said component and said resistor for limiting the heat produced by said resistor.
Specification