Two-transistor flyback single-stage PFC LED circuit

An LED circuit, double-tube flyback technology, applied in the direction of electric light source, electrical components, electroluminescent light source, etc., can solve the problems of poor device application selection, low efficiency of the whole machine, and high cost of the whole machine, and achieves small RDS, Energy saving, simple circuit effect

Active Publication Date: 2016-06-15
SICHUAN LEDFRIEND TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Two-transistor flyback single-stage PFC LED circuit

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Embodiment Construction

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

[0019] Please refer to figure 1 , the present invention adopts following technical scheme:

[0020] A dual-tube flyback single-stage PFC LED circuit, comprising a VCC power supply circuit, a dual-tube flyback circuit and a chip IC1, the dual-tube flyback circuit including a transformer T2, a diode D4, a capacitor C8, a diode D10 and a capacitor C17 , the transformer T2 includes a primary side N1, two secondary sides N2 and a secondary side N3, a resistor R23 is connected in series on the primary side N1, a Zener diode Z2 and a MOS transistor Q3 are connected in parallel on the secondary side N2, The transistor Q3 is electrically connected to the output end of the VC...

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Abstract

The invention discloses a two-transistor flyback single-stage PFC LED circuit, which comprises a VCC power supply circuit, a two-transistor flyback circuit and a chip IC1. A triode Q3 is electrically connected with the output end of the VCC power supply circuit; a diode D4 is connected in parallel with the MOS triode Q3 and a capacitor C8; the MOS triode Q3 is connected in series with a MOS triode Q4 through a capacitor C18; the capacitor C18 is connected to a first primary side of a transformer T1; a secondary side of the transformer T1 is connected with a diode DS7, a diode DS6, a capacitor SC11, a resistor RS1 and a resistor RS2; an N channel of the MOS triode Q3 is connected to a resistor R22 and a resistor R6; and pins of the chip IC1 are output to a totem circuit through a resistor R17. The two-transistor flyback single-stage PFC LED circuit is simple in circuit structure; MOS withstand voltage is small, and RDS is small; loss is low; efficiency is high; energy is saved; the service life of the product is prolonged; cost is low and reduced; and one high-withstand voltage MOS is far better 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/50H05B45/37Y02B20/30
Inventor 朱俊高王斌廖兴高
Owner SICHUAN LEDFRIEND TECH
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