Hot-plugging protection circuit for LED illuminating apparatus
A technology of LED illuminator and protection circuit, which is applied in lighting devices, electric lamp circuit layout, electric light source, etc., can solve the problems of short service life and damage to LED, and achieve the effect of avoiding peak current
Active Publication Date: 2014-05-28
JOULWATT TECH INC LTD
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Problems solved by technology
[0005] 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
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[0025] The present invention will be further described below in conjunction with the accompanying drawings.
[0026] refer to Figure 2~Figure 8 , a hot-swappable protection circuit for LED illuminators, including a current source 10, a filter capacitor C1 and an LED lamp string, the anode of the current source 10 is respectively connected to one end of the filter capacitor C1, and the anode of the LED lamp string connection, the negative pole of the current source 10 and the other end of the filter capacitor C1 are grounded, the hot swap protection circuit also includes a power tube M1, a current detection unit 20, a state latch and a reset unit 30, and the LED light The cathode of the string is connected to the drain of the switching tube M1 at the same time, the source of the switching tube M1 is connected to the current detection unit, and the LED lamp string, the drain of the switching tube M1 and the source of the switching tube M1 form a conduction branch , the current...
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The invention relates to a hot-plugging protection circuit for an LED illuminating apparatus. The hot-plugging protection circuit comprises a current source, a filtering capacitor and an LED light string. The positive electrode of the current source is respectively connected with one end of the filtering capacitor and the anode of the LED light string; and the negative electrode of the current source and the other end of the filtering capacitor are grounded. In addition, the hot-plugging protection circuit also includes a power tube M1, a current detection unit, a state latch and a reset unit. The cathode of the LED light string is simultaneously connected with a drain electrode of the power tube M1; and a source electrode of the power tube M1 is connected with the current detection unit. The drain electrode of the power tube M1 and the source electrode of the power tube M1 form a conduction branch; the conduction branch is connected in series with the current detection unit; the output terminal of the current detection unit is connected with a reset terminal of the state latch; the reset unit is connected with a setting terminal of the state latch; and the output terminal of the state latch is connected with a grid electrode of the power tube M1. According to the invention, an instantaneous peak current generated by the hot plugging of the LED light string can be effectively reduced; and the LED service life is prolonged.
Description
[0001] technical field [0002] The invention belongs to a driving device for an LED illuminator, and relates to a protection circuit for LED driving. Background technique [0003] refer to figure 1 , a traditional LED driving scheme, including a current source 10, a filter capacitor C1, and an 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 directly connected between the positive output terminal and the negative terminal. Capacitor C1; if the LED load is open circuit, the output current of the current source is 0, and the output voltage will be maintained at its maximum output voltage, which is greater than the forward conduction voltage of the LED load when it is working normally. At this time, if the LED load is suddenly connected, the instantaneous voltage at both ends of the LED is equal to the maxim...
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