Inductive current detecting circuit and LED (light emitting diode) driving circuit using inductive current detecting circuit

A technology of LED drive and voltage detection circuit, applied in the field of electronics, can solve the problems of low output current control accuracy, low power factor, unsatisfactory power factor correction of LED drive circuit, etc., and achieves low cost, small size and high reliability. sexual effect
CN102735906AActive Publication Date: 2012-10-17SILERGY SEMICON TECH (HANGZHOU) CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SILERGY SEMICON TECH (HANGZHOU) CO LTD
Publication Date
2012-10-17

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Abstract

The invention relates to an inductive current detecting circuit in a switch power supply and an LED (light emitting diode) driving circuit using the inductive current detecting circuit. According to the inductive current detecting circuit provided by the embodiment of the invention, an inductive current ending time in an interrupted working mode of the inductive current can be detected precisely through a voltage sampling and holding circuit so that inductive current duration time can be obtained precisely. According to the LED driving circuit provided by the embodiment of the invention, with the adoption of the inductive current detecting circuit, an inductive current average value can be obtained precisely, i.e. output current information of the LED driving circuit can be obtained precisely, so that the current control precision is improved; furthermore, the power factor calibration is realized; and a higher power factor is obtained.
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Description

technical field

[0001] The invention relates to the field of electronic technology, more specifically, to an inductor current detection circuit in a switching power supply and an LED driving circuit using the same. Background technique

[0002] With the continuous innovation and rapid development of the lighting industry, coupled with the increasing importance of energy saving and environmental protection, LED lighting, as a revolutionary energy-saving lighting technology, is developing rapidly. However, due to the volt-ampere characteristics and temperature characteristics of the LED itself, the sensitivity of the LED to the current is higher than the sensitivity to the voltage, so the traditional power supply cannot directly supply power to the LED. Therefore, to use LED as a lighting source, we must first solve the problem of power drive. Although the traditional LED drive power supply can realize LED brightness adjustment, it cannot realize power factor correction, the ...

Claims

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