A low frequency flicker AC led circuit

A LED light string and LED drive technology, applied in electric light sources, electrical components, electroluminescent light sources, etc., can solve problems such as adverse stimulation of the visual nerve center, eye fatigue and even headaches, and achieve reduced switching power and stroboscopic flicker , high efficiency effect
CN105939559BActive Publication Date: 2018-02-23北京易美新创科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
北京易美新创科技有限公司
Publication Date
2018-02-23

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Abstract

The invention discloses a low-frequency flashing AC LED driving circuit, comprising: a driving IC, an LED light string D0, an LED light string D1, an LED light string D2, an LED light string D3, an LED light string D4, a PMOS tube M0, and a PMOS tube M1 , PMOS transistor M2, PMOS transistor M3, PMOS transistor M4, current limiting resistor Rs. The invention adopts the method of combining gate negative feedback and source feedback to control the conduction current of different LED segments, so that the total load power of LEDs with different voltages remains consistent, so that the LED luminous flux changes very little; The high-voltage and high-current structure keeps the LED load power stable in a wide range of input voltage ranges; the use of high-end PMOS control tubes and LED series circuits ensures that the system still has high efficiency at low voltages; fundamentally increases the drive efficiency, The power factor is improved, the switching power of the MOS tube is reduced, and the strobe is reduced.
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Description

technical field

[0001] The invention belongs to the technical field of semiconductor lighting applications, in particular to a low-frequency flicker AC LED circuit structure. Background technique

[0002] At present, LED chips have been widely used in the field of new energy-saving light sources due to their high efficiency, high integration and long life. In LED light sources, power drive is a key technology. Due to the high integration and low cost requirements of LED applications, AC LED drive solutions without inductance and capacitors and other energy storage devices are taking an increasing share in the market. In this type of driving scheme, the control IC controls the number of LEDs that the actual conduction current passes through by adjusting the gate voltage of the LED pass switch MOS tube, so as to compensate for the excessive conduction current to the input voltage caused by the non-linearity of the LED. Sensitive, so as to achieve the purpose of current limit...

Claims

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