Ripple compensation circuit, buck type led driver and lamps
A technology of LED driver and ripple compensation, applied in the field of compensation circuit, can solve the problems of short reliability, less than 10,000 hours, increase in power supply volume and weight, etc., and achieve the effect of good stability, small size and long life
Active Publication Date: 2018-04-27
SHENZHEN OCEANS KING LIGHTING ENG CO LTD +1
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Problems solved by technology
However, with the increase of capacitor capacity, the size and weight of the power supply increase, which affects the miniaturization and integration of the power supply. More importantly, the life of the electrolytic capacitor in practical applications becomes the main reason for limiting the life of the LED drive power supply.
In the actual LED lighting application environment, the life of electrolytic capacitors is usually less than 10,000 hours, which is in sharp contrast to the theoretically long life of LEDs (about 100,000 hours), and has become a shortcoming of the reliability of LED lamps.
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[0016] In order to further illustrate the principle and structure of the present invention, preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0017] Example of Ripple Compensation Circuit
[0018] The present invention proposes a ripple compensation circuit, which includes: a ripple current detection module 11 and a ripple current adjustment module 12 . The ripple current detection module 11 is used to detect the ripple current in the circuit, and the ripple current adjustment module 12 is used to adjust the ripple current.
[0019] The ripple current detection module 11 includes: a first input terminal, a second input terminal, a first output terminal and a second output terminal. The ripple current adjustment module 12 includes: a first input terminal, a second input terminal and an output terminal. The first input end of the ripple current adjustment module 12 is connected to the first output en...
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A ripple compensation circuit, a BUCK type LED driver, and a lamp, comprising: a BUCK conversion circuit, a ripple current detection module, a ripple current adjustment module, and a control circuit; the BUCK conversion circuit is connected to a power supply and an LED lamp, and a ripple current detection module Connect the BUCK conversion circuit, the ripple current adjustment module is connected to the ripple current detection module, the control circuit is connected to the ripple current adjustment module and the BUCK conversion circuit; the ripple current detection module is used to detect the ripple current in the circuit; the ripple current adjustment module Used to adjust the ripple current; the control circuit is used to keep the current constant. The invention can supplement the inductor ripple current in the circuit, prolong the service life of the lamp, have higher stability and smaller volume.
Description
technical field [0001] The invention relates to a compensation circuit, in particular to a ripple compensation circuit, a BUCK type LED driver and a lamp. Background technique [0002] In the traditional LED drive power supply, the back stage of the BUCK circuit adopts LC filter. When the drive power supply is working, its output voltage is composed of tiny ripple and large DC component. Since the current-voltage characteristics of the LED are nonlinear, as long as the forward voltage changes, it will cause a large change in the forward current, and the brightness of the LED is closely related to the magnitude of the current. When the power supply drives the LED to work, this ripple voltage will cause a large ripple current on the LED. Increasing the filter capacitor (usually an electrolytic capacitor) in the LC circuit can reduce the ripple current of the LED. However, as the capacity of the capacitor increases, the volume and weight of the power supply increase, which af...
Claims
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IPC IPC(8): H02M3/155
Inventor 周明杰张飞
Owner SHENZHEN OCEANS KING LIGHTING ENG CO LTD