Three phase lighted plugs and connectors for indicating the absence of at least one phase
First Claim
1. Apparatus adapted to be coupled to an AC multi-phase power line having a first conductor for receiving a first phase, a second conductor for receiving a second phase, a third conductor for receiving a third phase and a fourth conductor for a ground connection comprising:
- a first series circuit of a diode interposed between a first resistor and a second resistor;
a second series circuit of a diode interposed between a first resistor and a second resistor;
a third circuit of a diode interposed between a first resistor and a second resistor;
said first, second and third series circuits coupled in parallel with each other between a first end terminal coupled to the first resistor of each series circuit and a second end terminal coupled to the second resistor of each series circuit;
indicator means coupled between said first and second end terminals;
a first diode having a first terminal coupled to said first end terminal and a second terminal adapted to be coupled to said fourth conductor;
said first conductor for receiving said first phase is coupled between said diode and said second resistor of said first series circuit;
said second conductor for receiving said second phase is coupled between said diode and said second resistor of said second series circuit; and
said third conductor for receiving said third phase is coupled between said diode and said second resistor of said third series circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
Indicator means located in a plug or connector indicates when at least one phase of an AC multi-phase voltage is absent. The indicator means can be any one of a variety of light sources and/or an audible generator. The light source can be, for example, an LED, an illuminating ring visible from any angle around the body of the plug or connector, etc. An opaque barrier can be used to totally or partially block the light from the light source when light from the light indicator may be objectionable such as during a stage lighting application. The indicator means for detecting the absence of at least one phase can be on a printed circuit board connected to receive power from the conductors in the plug or connector.
21 Citations
13 Claims
-
1. Apparatus adapted to be coupled to an AC multi-phase power line having a first conductor for receiving a first phase, a second conductor for receiving a second phase, a third conductor for receiving a third phase and a fourth conductor for a ground connection comprising:
-
a first series circuit of a diode interposed between a first resistor and a second resistor; a second series circuit of a diode interposed between a first resistor and a second resistor; a third circuit of a diode interposed between a first resistor and a second resistor;
said first, second and third series circuits coupled in parallel with each other between a first end terminal coupled to the first resistor of each series circuit and a second end terminal coupled to the second resistor of each series circuit;indicator means coupled between said first and second end terminals; a first diode having a first terminal coupled to said first end terminal and a second terminal adapted to be coupled to said fourth conductor; said first conductor for receiving said first phase is coupled between said diode and said second resistor of said first series circuit; said second conductor for receiving said second phase is coupled between said diode and said second resistor of said second series circuit; and said third conductor for receiving said third phase is coupled between said diode and said second resistor of said third series circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
Specification