Isolated power supply for indicator light
First Claim
Patent Images
1. An isolated open loop power supply for an indicator light comprising:
- a planar transformer comprising;
a printed circuit board;
a primary winding comprising a first conductive trace on said board;
a secondary winding comprising a second conductive trace on said board isolated from said first conductive trace; and
a ferrite core assembled to said printed circuit board coupling said primary and said secondary windings;
an indicator light connected to said secondary winding;
solid state switch means;
a source of electrical power connected to said primary winding through said solid state switch means; and
a high frequency oscillator on said printed circuit board connected to said source and being operable for operating said solid state switch means for supplying energizing pulses to said primary winding.
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Accused Products
Abstract
A planar transformer having windings on a printed circuit board coupled by a high frequency ferrite core driven by a high frequency operational amplifier based relaxation oscillator controlling a switch for pulsing a primary winding of the transformer at a set frequency. The secondary of the transformer powers a lamp circuit which is isolated from the electrical supply, and a test input is connected in a logic OR arrangement with the electrical supply.
78 Citations
7 Claims
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1. An isolated open loop power supply for an indicator light comprising:
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a planar transformer comprising; a printed circuit board; a primary winding comprising a first conductive trace on said board; a secondary winding comprising a second conductive trace on said board isolated from said first conductive trace; and a ferrite core assembled to said printed circuit board coupling said primary and said secondary windings; an indicator light connected to said secondary winding; solid state switch means; a source of electrical power connected to said primary winding through said solid state switch means; and a high frequency oscillator on said printed circuit board connected to said source and being operable for operating said solid state switch means for supplying energizing pulses to said primary winding. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification