Circuit arrangement and method for operating at least one led and at least one fluorescent lamp

Abstract

Circuit arrangement for operating an LED (LD5, LD6) and a fluorescent lamp (LA) with a main rectifier (12), an auxiliary rectifier (14), an inverter (16), which has a terminal for connecting the fluorescent lamp (LA), a starting apparatus (D14) with a first and a second terminal, wherein the first terminal thereof is coupled to a control electrode of one of the switches of the inverter (16), a pull-down circuit (22) with a first and a second terminal, wherein the first terminal thereof is coupled to the output of the inverter (16), and a starting capacitor (C1) for providing energy for the starting apparatus (D14), wherein the second terminal of the starting apparatus (D14) and the second terminal of the pull-down circuit (22) are coupled to the first output terminal (A13) of the auxiliary rectifier (14), the starting capacitor (C1) is coupled between the first (A13) and the second output terminal (A14) of the auxiliary rectifier (14), and a series circuit, which comprises a first anda second terminal for the at least one LED (D5, D6) and an LED switch (Q3), is arranged in parallel with the starting capacitor (C1).

Description

technical field [0001] The invention relates to a circuit arrangement for operating at least one light-emitting diode (LED) and at least one fluorescent lamp, the circuit arrangement having: an input with a first input terminal and a second input terminal for connecting an AC supply voltage; A main rectifier with a first input terminal and a second input terminal and a first output terminal and a second output terminal, wherein the first input terminal and the second input terminal of the main rectifier are connected to the first input terminal and the second input terminal for connecting the supply AC voltage Two-input terminal coupling; an auxiliary rectifier having a first input terminal and a second input terminal and a first output terminal and a second output terminal, wherein the first input terminal and the second input terminal of the auxiliary rectifier are connected to a power supply AC voltage a first input terminal coupled to a second input terminal; an inverter c...

AI Technical Summary

Problems solved by technology

[0008] to accompany figure 1 Several disadvantages arise due to the circuit arrangement: the auxiliary rectifier 14 is a rectifier which has to be designed for 600 V when the circuit arrangement is to be connected to the usual AC network

[0009] Another disadvantage is that there are three timing circuits that are completely independent of each other, that is, the LED turn-off delay device formed by R10 and C6, the inverter start circuit formed by R1 and C1, and the inverter start delay device 19, which are three Should jointly control the or-or process (Entweder-Oder-Prozess)

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