Light-emitting element driving device and dimming control circuit and dimming control method thereof

• Main Authors: QIU RENLIAN, CHEN YAOZHOU, CHEN YUMIN
• Format: Patent
• Language: Chinese; English
• Published: 27.04.2021
• Subjects: ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY

The invention discloses a light-emitting element driving device and a dimming control circuit and a dimming control method thereof. The light-emitting element driving device comprises a power level circuit and a dimming control circuit. The power level circuit comprises an inductor and a power switch and is used for driving the light-emitting element circuit. The dimming control circuit is used for controlling the power switch. The dimming control circuit comprises a duty ratio conversion circuit for converting a PWM dimming signal to generate a digital duty ratio signal, a digital-to-analog conversion circuit for converting the digital duty ratio signal to generate an analog reference signal, an error amplification circuit for generating an error amplification signal according to the difference between the analog reference signal and the output current related signal, and a modulation control circuit generating a PWM control signal according to the error amplification signal to control the power switch such