Hot-swap protection circuit for led illuminator
A technology of LED illuminators and protection circuits, which is applied in the direction of lighting devices, lamp circuit layout, electric light source, etc., can solve the problems of short service life, damage to LEDs, etc., and achieve the effect of avoiding peak currents
Active Publication Date: 2016-05-25
JOULWATT TECH INC LTD
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Problems solved by technology
[0004] In order to overcome the shortcomings of the existing LED drive circuit that the instantaneous peak current generated when the LED light string is hot-swappable and the LED is damaged and the service life is short, the present invention provides a method that can effectively reduce the current generated when the LED light string is hot-swappable. Instantaneous peak current, hot-swap protection circuit for LED illuminator to prolong LED service life
Method used
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[0020] The present invention will be further described below in conjunction with the drawings.
[0021] Reference Figure 2~Figure 8 , A hot-swappable protection circuit for LED luminaires, comprising a current source 10, a filter capacitor C1 and an LED string, the anode of the current source 10 is connected to one end of the filter capacitor C1 and the anode of the LED string respectively Connected, the negative electrode of the current source 10 and the other end of the filter capacitor C1 are all grounded, the hot-plug protection circuit further includes a power tube M1, a current detection unit 20, a state latch and a reset unit 30, the LED lamp The cathode of the string is simultaneously connected to the drain of the switching tube M1, the source of the switching tube M1 is connected to the current detection unit, and the LED string, the drain of the switching tube M1 and the source of the switching tube M1 form a conducting branch , The current detection unit 20 is connec...
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A hot-swappable protection circuit for LED lighting, including a current source, a filter capacitor and an LED light string. Both ends are grounded, and the hot-swap protection circuit also includes a power tube M1, a current detection unit, a status latch and a reset unit. The cathode of the LED light string is connected to the drain of the power tube M1 at the same time, and the source of the power tube M1 is connected to the current The detection unit, the LED light string, the drain of the power tube M1 and the source of the power tube M1 form a conduction branch, and a current detection unit is connected in series on the conduction branch, and the output terminal of the current detection unit is connected to the reset terminal of the state latch , the reset unit is connected to the set end of the state latch, and the output end of the state latch is connected to the gate of the power transistor M1. The invention effectively reduces the instantaneous peak current generated when the LED light string is hot plugged and unplugged, and prolongs the service life of the LED.
Description
Technical field [0001] The invention belongs to a driving device of an LED illuminator, and relates to a protection circuit driven by an LED. Background technique [0002] Reference figure 1 , The traditional LED driving scheme includes current source 10, filter capacitor C1, LED light string; the positive output terminal of the current source is connected to the anode of the LED light string, the negative output terminal is connected to the cathode of the LED light string, and the filter is connected between the positive and negative output terminals Capacitor C1: If the LED load is open, the output current of the current source is 0, and the output voltage will remain at its maximum output voltage, which is greater than the forward conduction voltage when the LED load is working normally. At this time, if the LED load is suddenly connected, the instantaneous voltage across the LED is equal to the maximum output voltage of the current source, and the instantaneous current of the...
Claims
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IPC IPC(8): H05B37/02H05B44/00
CPCH05B45/50H05B45/00Y02B20/30
Inventor 白浪黄必亮任远程周逊伟
Owner JOULWATT TECH INC LTD