LED drive circuit with high power factor and no flicker

A technology of LED driving and high power factor, which is applied in the direction of electric lamp circuit layout, electric light source, lighting device, etc., can solve unrealistic problems, increase output capacitor capacity, etc., and achieve the effect of solving stroboscopic and improving power factor

CN103763841BActive Publication Date: 2015-11-18SUZHOU ZHIPU XINLIAN ELECTRONICS TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-11-18

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Abstract

The invention discloses a high-power factor and non-strobe LED drive circuit which comprises a voltage reduction type converter structure and a boosting type converter structure at the same time. By the adoption of the structure, the high-power factor and non-strobe LED drive circuit can continuously work within one power frequency cycle, energy is transmitted from input voltage to output voltage all the time, and output current does not have power frequency ripple waves. According to the high-power factor and non-strobe LED drive circuit, the purposes of improving the power factor and avoiding strobe can be achieved at the same time without a large output capacitor or a special power factor correction constant output control chip.
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Description

technical field

[0001] The invention relates to an LED driving circuit, in particular to an LED driving circuit with high power factor and no flicker. Background technique

[0002] When the switching power supply is used to drive the LED light-emitting diode, in order to keep the brightness of the LED light-emitting diode constant, the LED drive power supply is required to have the function of constant current output. In addition, there are also certain requirements for the power factor of LED light-emitting diode bulbs connected to the AC grid, because if the power factor does not meet the requirements, it will cause a certain degree of pollution to the grid. The IEC International Electrotechnical Commission has put forward clear harmonic requirements for lighting fixtures, namely the IEC61000-3-2 standard; the American Energy Star standard stipulates that the power factor of LED light-emitting diode bulbs with a power greater than 5W is required to be no less than 0.7; the...

Examples

Embodiment approach

[0030] The inventive idea of ​​the present invention is: as figure 1 The topology of the classic step-down power factor correction circuit shown in the actual work not only needs to add a dedicated power factor correction constant current driver chip, but also produces stroboscopic phenomenon. In order to overcome the above defects, we need to improve the traditional buck structure. Based on the above purpose, the present invention improves the traditional step-down structure to form a new circuit structure. In this new circuit structure, it only needs to add the existing general-purpose power management control chip to improve the power factor at the same time. And to avoid the purpose of stroboscopic phenomenon.

[0031] Figure 4 It is a structural schematic diagram of the first embodiment of the present invention, Figure 4 Including: rectifier bridge 401, capacitor 402, inductor 403, diode 404, capacitor 405, switch tube 406, diode 407, inductor 408, capacitor 409 and ...