led linear discharge circuit and linear discharge method
A leakage circuit, linear technology, applied in the direction of lamp circuit layout, electric light source, lighting device, etc., can solve the problem of discontinuous change of LED brightness at viewing angle, inability to change the electromotive force and current of the inductance, etc.
Active Publication Date: 2016-12-28
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 with reference to the drawings and specific embodiments.
[0011] Such as image 3 As shown, the LED linear bleeder circuit includes a PWM controller 1, an LED drive IC 2, an inductor 3, and an LED 4 connected in sequence. The bleeder circuit 5 is connected between the inductor 3 and the LED 4, and the bleeder circuit includes a series connection The freewheeling tube 51 and the power tube 52 are controlled by the PWM controller. When the LED is turned on, the PWM controller 1 turns off the bleeder circuit after the reverse direction. When the PWM controller 1 runs to a low level, the PWM controller 1 reverses to start the bleeder circuit, which is consumed by the freewheeling tube 51 and the power tube 52 The freewheeling generated by the inductor 3 prevents the freewheeling from passing through the LED. Therefore, the freewheeling generated by the inductance does not affect the LED and plays a role of linea...
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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 current leakage circuit and a linear current leakage 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. In 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. Makes the LED still pass through when the PWM is low voltage. When the PWM pulse width is changed slightly, the amount of PWM change cannot change the electromotive force and current generated by the inductance. Only when the pulse width of the PWM is accumulated 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 curv...
Claims
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IPC IPC(8): H05B37/02
Inventor 陈志勤
Owner GUANGZHOU YAJIANG PHOTOELECTRIC EQUIP CO LTD