Peak detection circuit and peak detector
A wave crest and circuit technology, applied in the field of LED drive circuit, can solve the problem of wrong PFC reference voltage, inability to realize PFC sine wave modulation, etc., to avoid the effect of being missed detection
Active Publication Date: 2018-09-28
江苏潘多拉医疗器械有限公司
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Problems solved by technology
At this time, some peak points will be missed, which will generate wrong PFC reference voltage, so that the function of PFC sine wave modulation cannot be realized.
[0004] Therefore, using the existing preset peak detector 101, the function of PFC sine wave modulation cannot be realized because the peak point is missed.
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[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0029] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and not necessarily Used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate ci...
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The invention provides a peak detection circuit and a peak detector, which belong to the technical field of LED drive circuits. The peak detection circuit includes: a differential amplifier, a preset field effect tube, a preset capacitor and a voltage divider circuit, the first end of the differential amplifier is connected to the first end of the preset field effect tube, and the second end of the differential amplifier is respectively connected to the preset The second end of the FET is connected to the first end of the preset capacitor; one end of the voltage divider circuit is connected to the first end of the preset capacitor; wherein, the differential amplifier is used to receive the input signal and input the input signal to the preset A field effect tube is provided, and the preset field effect tube is used to output the first peak signal, and the voltage divider circuit is used to perform voltage division processing on the first peak signal through a preset capacitor to generate a second peak signal. The peak detection circuit and the peak detector provided by the invention realize the function of PFC sine wave modulation.
Description
technical field [0001] The invention relates to the technical field of LED drive circuits, in particular to a peak detection circuit and a peak detector. Background technique [0002] Light Emitting Diode (LED for short) is a kind of high-efficiency lamps and lanterns, which have been widely used in various indications, displays, decorations, backlights, general lighting and urban night scenes and other fields. LED lamps are generally required to have a power factor correction (Power Factor Correction, PFC for short) function, especially a high-power LED driver, which is an important component of the LED lamp. [0003] The first block in the PFC unit is the peak time detector, see figure 1 as shown, figure 1 A schematic structural diagram of a peak time detector provided in the prior art, the peak time detector 10 is composed of a preset peak detector 101 , a bias voltage source 102 , a comparator 103 and a single pulse generator 104 . Wherein, the preset peak detector 10...
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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/50
Inventor 陈银铭刘沁曾存民
Owner 江苏潘多拉医疗器械有限公司