Buffer circuit for LED drive circuit, LED drive circuit and control method thereof

• Main Authors: HE WANYUE, LIU GUOQIANG
• Format: Patent
• Language: Chinese; English
• Published: 15.04.2022
• Subjects: ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY

The invention discloses a buffer circuit for an LED drive circuit, the LED drive circuit and a control method thereof, and the buffer circuit comprises a first control switch which is connected in series in a rectified input loop; the feedback control module is connected with the rectified input loop, obtains loop current in the rectified input loop and is used for generating a first control signal to the first control switch according to the loop current and a reference signal, the first control switch is switched between a complete conduction state and an incomplete conduction state based on the first control signal, and the first control switch is switched between the complete conduction state and the incomplete conduction state based on the reference signal. And when the first control switch works in an incomplete conduction state, the loop current is inhibited. According to the invention, the suppression effect on the current change rate is enhanced, the current overshoot in the circuit can be effectivel