LED driving circuit harmonic wave improvement method

The embodiment of the invention discloses an LED driving circuit harmonic wave improvement method which is applied to N segments of segmented linear driving circuits. The method comprises the following steps that the current step value of each segment is set proportionally so as to control low-order...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	WANG QINHENG
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	The embodiment of the invention discloses an LED driving circuit harmonic wave improvement method which is applied to N segments of segmented linear driving circuits. The method comprises the following steps that the current step value of each segment is set proportionally so as to control low-order harmonic current; and the rectified input voltage sampling values are superposed on reference voltage according to the specific proportion coefficient so as to control high-order harmonic current. The step of setting the current step value of each segment proportionally to control low-order harmonic current comprises the following steps that a current step switching angle is calculated according to the LED segmented voltage values; a corresponding step current proportional value is calculated according to the switching angle and a sine curve; and sampling resistance values are adjusted and step current is set respectively. Internal reference voltage is enabled to follow the change of input voltage so that current flowing through LED strings is controlled and an objective of harmonic wave improvement can be achieved.