Ripple current suppression circuit
A technology for suppressing circuit and ripple current. It is applied in the direction of electric lamp circuit layout, electric light source, lighting device, etc. It can solve the problems of large current ripple, troublesome monitoring equipment, discomfort to human eyes, etc., and achieve the effect of reducing current ripple.
Active Publication Date: 2014-06-25
MAXIC TECHNOLOGY CORPORATION
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Problems solved by technology
However, the current ripple output by this single-stage PFC circuit is very large, so that the LED light has twice the flicker frequency of the commercial power, which causes discomfort to the human eye and troubles to the monitoring equipment.
[0003] In order to solve this problem in the existing LED circuit, it is often necessary to connect a large capacitor in parallel at both ends of the LED drive circuit to smooth the current, which increases the cost and area.
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[0021] 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. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0022] The pre-stage LED drive circuit in the existing LED circuit can be regarded as a current source, which provides a constant average current to its load (LED), but this current may fluctuate with the frequency of the mains. If the ripple current flowing through the LED is simply reduced by connecting a capacitor in parallel to the load (LED), since the internal resistance of the LED itself is very small, this LED circuit requires a large capacitor to achieve a ...
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The invention discloses a ripple current suppression circuit which comprises an impedance variable device, a current detecting device, a reference signal generating circuit and a first comparator. The impedance variable device is provided with a first end, a second end and a third end, the first end receives control signals, the impedance variable device adjusts the impedance values thereof according to the control signals, and the impedance variable device is connected to an external current loop through the second end and the third end. The current detecting device is connected with the impedance variable device and is used for detecting the current value of the impedance variable device. The reference signal generating circuit is used for generating reference signals. The first comparator comprises a first input end and a second input end, wherein the first input end and the second input end are used for receiving reference signals and the detected current value of the impedance variable device respectively, and the comparative results serve as control signals of the impedance variable device. The ripple current suppression circuit enables currents passing through a load connected with the ripple current suppression circuit in series to be constant basically, and therefore reduces the current ripples on the load.
Description
technical field [0001] The invention relates to the technical field of LEDs, in particular to a ripple current suppression circuit. Background technique [0002] In an existing LED circuit, an LED (Light-Emitting Diode, light-emitting diode) driving circuit is usually implemented by a single-stage PFC (Power Factor Correction, power factor correction) circuit in order to meet the requirements of power factor and cost. However, the current ripple output by this single-stage PFC circuit is very large, so that the light of the LED has twice the flickering frequency of the commercial power, which causes discomfort to the human eye and also brings troubles to the monitoring equipment. [0003] In order to solve this problem in the existing LED circuit, it is often necessary to connect a large capacitor in parallel at both ends of the LED driving circuit to smooth the current, which increases the cost and area. Contents of the invention [0004] An embodiment of the present inv...
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Inventor 高峻刘柳胜程宝洪
Owner MAXIC TECHNOLOGY CORPORATION