Patent ID: 11917735
Assignee: CRM ICBG (WUXI) CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 14:
15. A closed-loop control method for LED driving, including:
when a bus voltage is less than an on-voltage of an LED load, discharging, by an electrolytic capacitor, to the LED load, and performing, via a constant-current control module, constant-current control on the LED load, wherein when a discharging voltage of the electrolytic capacitor is higher than a first preset voltage, a subtraction operation is performed by an addition and subtraction counter to reduce a charging current of the electrolytic capacitor, and thus reduce the discharging voltage of the electrolytic capacitor; when the discharging voltage of the electrolytic capacitor is lower than a second preset voltage, an addition operation is performed by the addition and subtraction counter to increase the charging current of the electrolytic capacitor, thus increasing the discharging voltage of the electrolytic capacitor;
when the bus voltage is greater than the on-voltage of the LED load, supplying the LED load with the bus voltage, and performing constant-current control on the LED load by the constant-current control module, and charging the electrolytic capacitor with the bus voltage; and
when the bus voltage is less than a voltage difference cross the electrolytic capacitor, discharging to the LED load by the electrolytic capacitor, and performing constant-current control on the LED load by the constant-current control module.