Patent ID: 8441207

Claim:
An LED streetlight circuit including an AC power supply ( 1 ), a switching circuit ( 2 ), an output controller ( 3 ), and an LED array ( 4 ) connected to the output controller ( 3 ), wherein the switching circuit ( 2 ) includes an EMI filter ( 201 ) connected to the AC power supply ( 1 ), a power factor corrector ( 202 ) connected to the EMI filter ( 201 ), a transformer ( 203 ) connected to the power factor corrector ( 202 ), a rectifier/filter ( 204 ) connected to the transformer ( 203 ), a standby power supply ( 205 ) connected to the power factor corrector ( 202 ), a controller ( 206 ) connected to the transformer ( 203 ), an luminance regulator ( 207 ) connected to the controller ( 206 ), an optical coupler controlling loop ( 208 ) connected to the controller ( 206 ) and the rectifier/filter ( 204 ), and an optically controlled switch ( 209 ) for connecting the standby power supply ( 205 ) to the optical coupler controlling loop ( 208 ), wherein the output controller ( 3 ) includes a CC/CV controller ( 301 ) connected to the rectifier/filter ( 204 ) and the optical coupler controlling loop ( 208 ), an output voltage regulator (SRV) connected to the CC/CV controller ( 301 ), and an output current regulator (SRC) connected to the CC/CV controller ( 301 ).