Patent ID: 9723660
Date: 2017-08-01
CPC Classifications: H05B

Claim:
1. A lighting apparatus comprising: a light head comprising one or more light emitting diode (LED) devices; a lamp post supporting the light head at an elevated position; a power conversion circuit disposed in the lamp post below and spaced apart from the light head, the power conversion circuit converting input AC electrical power having frequency of less than 100 hertz to transfer high frequency AC electrical power having frequency of at least 400 Hertz, wherein the power conversion circuit comprises a power factor (PF) correction circuit that performs power factor (PF) correction on the input AC electrical power and performs AC/DC conversion generating DC electrical power, and an inverter circuit converting the DC electrical power to transfer power comprising AC electrical power having a square waveform; and circuitry disposed in the light head and electrically connected with the power conversion circuit via electrical wires running through the lamp post, the circuitry disposed in the light head being configured to operate the one or more LED devices of the light head using the transfer electrical power, wherein the circuitry disposed in the light head comprises a constant current source configured to operate the one or more LED devices of the light head at a constant drive current using the transfer electrical power.