Multiple-path PWM wave-chopping flow-equalizing circuit suitable for LED driver

• Main Authors: GE LIANGAN, YAO XIAOLI, HUA GUICHAO
• Format: Patent
• Language: Chinese; English
• Published: 18.08.2010
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERATION

The utility model discloses a multiple-path PWM (pulse-width modulation) wave-chopping flow-equalizing circuit suitable for an LED (light emitting diode) driver, which includes a single-output constant flow source and a plurality of loads in parallel output, and each load is formed by a plurality of LEDs connected in series and is connected in series with a flow equalizing circuit and a flow-equalizing control circuit. The utility model is characterized in that the flow equalizing circuit consists of a compensating pipe and a sampling resistor which are connected in series; the input of each path of flow-equalizing control circuit comes from each path of sampling resistor sampling the path of current, and a common connection line is formed after the conversion by respective flow-equalizing control circuit and connected with other circuits to form a flow-equalizing bus; and each path of current sampling signal and flow-equalizing bus voltage generates PWM signals or high level signals after being compared and