A dual-tube flyback single-stage pfc led circuit

Abstract

The invention discloses a double-tube flyback single-stage PFC LED circuit, which includes a VCC power supply circuit, a double-tube flyback circuit, a triode Q3 and a chip IC1, and the triode Q3 is electrically connected to the output end of the VCC power supply circuit. The diode D4 is respectively connected in parallel with the MOS transistor Q3 and the capacitor C8, the MOS transistor Q3 is connected in series with the MOS transistor Q4 through the capacitor C18, and the capacitor C18 is also connected to the first primary side of the transformer T1, and the secondary side of the transformer T1 The side is connected with a diode DS7, a diode DS6, a capacitor CS11, a resistor RS1 and a resistor RS2. The N channel of the MOS transistor Q3 is connected to a resistor R22 and a resistor R6 respectively, and the pin of the chip IC1 is output to the totem circuit through a resistor R17. The invention has simple circuit structure, low MOS withstand voltage, naturally small RDS, low loss, high efficiency, energy saving, prolonging product life, and low cost at the same time, which reduces the cost. One MOS with high withstand voltage is much higher than two Low voltage MOS.

Description

technical field [0001] The invention belongs to the technical field of LED power supplies, and in particular relates to a dual-tube flyback single-stage PFC LED circuit, which is specifically applied to LED power supplies with higher AC input voltage, higher PF and low THD requirements. Background technique [0002] The existing LED power supply technology applications are either input voltage below 305V, or a higher input voltage is achieved through a dual-stage PFC circuit. From the cost of the whole machine, and the application selection of the device, to the efficiency of the whole machine, the power of the product Density is a relatively traditional technology, resulting in high cost of the whole machine, poor application selection of devices and low efficiency of the whole machine. The current double-tube single-stage PFC circuit can better solve the deficiencies of the prior art. Contents of the invention [0003] The purpose of the present invention is to provide ...

AI Technical Summary

Problems solved by technology

[0002] The existing LED power supply technology applications are either input voltage below 305V, or a higher input voltage is achieved through a dual-stage PFC circuit. From the cost of the whole machine, and the application selection of the device, to the efficiency of the whole machine, the power of the product Density is a relatively traditional technology, resulting in high cost of the whole machine, poor application selection of devices and low efficiency of the whole machine

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