Circuit device for LED matrix lamp

• Main Author: KOVATCHEV EMIL
• Format: Patent
• Language: Chinese; English
• Published: 31.01.2023
• Subjects: ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY

The invention relates to a circuit arrangement (5), comprising: an LED chain (LED1, LED2, LED3, LED4, LED5), which comprises a plurality of LEDs; bypass switching elements (Q1, Q2, Q3, Q4, Q5) wherein each LED is assigned to one of the bypass switching elements and each of the bypass switching elements has a driver terminal (PWM1, PWM2, PWM3, PWM4, PWM5) wherein the driver terminals (PWM1, PWM2, PWM3, PWM4, PWM5) are connected to the bypass switching elements (Q1, Q2, Q3, Q4, Q5). Each of the bypass switching elements is designed to bypass the LEDs in the LED chain associated with the bypass switching element based on the voltage at the driver terminal associated with the bypass switching element; and a switch wherein the driver terminals of the bypass switching elements are connected to the switch via a common node (Z), the switch being designed to discharge a capacitor (Cb), which can be connected to a constant current source (2) of the LED chain, on the basis of a voltage applied to the node. The invention