Linear bleeder circuit and linear discharging method for LED
A bleeder circuit and LED drive technology, applied in the layout of electric lamp circuits, electric light sources, lighting devices, etc., can solve the problems of inability to change the inductance electromotive force and current amount, and discontinuous changes in the LED brightness of the viewing angle.
Active Publication Date: 2013-11-27
GUANGZHOU YAJIANG PHOTOELECTRIC EQUIP CO LTD
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Problems solved by technology
like figure 1 As shown, the circuit includes a PWM controller, LED driver IC, inductor and LED connected in sequence. During the dimming process, when the voltage of the LED is relatively large and the pulse width of the PWM is relatively small, the inductor will generate a large electromotive force and current. So that the LED still has current through when the PWM is at a low voltage. When the PWM slightly changes the pulse width, the amount changed by the PWM cannot change the electromotive force and current generated by the inductance. Only when the PWM pulse width accumulates to a certain amount can the inductance be changed. The electromotive force and the amount of current, therefore, will produce such as figure 2 The non-linear curve shown, the viewing angle causes the LED brightness to change discontinuously
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[0010] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0011] Such as image 3 As shown, the LED linear leakage circuit includes a PWM controller 1, an LED driver IC 2, an inductor 3 and an LED 4 connected in sequence, and the leakage circuit 5 is connected between the inductor 3 and the LED4, and the leakage circuit includes a series connection freewheeling tube 51 and power tube 52, and the power tube 52 is controlled by a PWM controller. When starting the LED, the PWM controller 1 reverses and then closes the bleeder circuit. When the PWM controller 1 runs to a low position, the PWM controller 1 reverses the bleeder circuit, which is consumed by the freewheeling tube 51 and the power tube 52. The freewheeling current generated by the inductor 3 prevents the freewheeling current from passing through the LED. Therefore, the freewheeling current generated by the inductor will not affect ...
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The invention discloses a linear bleeder circuit and linear discharging method for an LED. The linear bleeder circuit comprises a PWM controller, an LED driving IC, an inductor and the LED which are sequentially connected, wherein a bleeder circuit body is connected between the inductor and the LED. The linear discharging method comprises the steps that when the LED is started, the PWM controller can be reversed to close the bleeder circuit body; when the PWM controller runs at a lower position, the PWM controller can be reversed to start the bleeder circuit body, and follow current generated by the inductor can be consumed by a follow current tube and a power tube. By means of the linear bleeder circuit and linear discharging method, the purpose of linear dimming can be achieved.
Description
technical field [0001] The invention relates to an LED linear discharge circuit and a linear discharge method. Background technique [0002] In order to realize the adjustment of LED brightness, most of them are controlled by PWM technology. Such as figure 1 As shown, the circuit includes a PWM controller, LED driver IC, inductor and LED connected in sequence. During the dimming process, when the voltage of the LED is relatively large and the pulse width of the PWM is relatively small, the inductor will generate a large electromotive force and current. So that the LED still has current through when the PWM is at a low voltage. When the PWM slightly changes the pulse width, the amount changed by the PWM cannot change the electromotive force and current generated by the inductance. Only when the PWM pulse width accumulates to a certain amount can the inductance be changed. The electromotive force and the amount of current, therefore, will produce such as figure 2 The non-l...
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IPC IPC(8): H05B37/02
Inventor 陈志勤
Owner GUANGZHOU YAJIANG PHOTOELECTRIC EQUIP CO LTD