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Light-emitting diode soft start circuit

A soft-start circuit and light-emitting diode technology, applied in the direction of electric lamp circuit layout, light source, electric light source, etc., can solve problems such as adverse effects of human vision, current overshoot, LED micro-flicker, etc., to eliminate the phenomenon of start-up micro-flicker, optimize The effect of control

Active Publication Date: 2019-06-04
DIOO MICROCIRCUITS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] As mentioned above, during the entire start-up process, due to the overshoot of the node VC voltage, the current flowing through the LED will also overshoot, which will inevitably cause the LED to have a slight flicker phenomenon, causing adverse effects on human vision.

Method used

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Embodiment Construction

[0039] The implementation of the present invention is described below with specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments.

[0040] see image 3 , image 3 It is a schematic diagram of the light emitting diode soft start circuit of the present invention and a driving circuit applying the light emitting diode soft start circuit of the present invention. As shown in the figure, the light emitting diode soft start circuit 1 of the present invention is characterized in that it includes a timing control module 10 and an internal current source module 11 .

[0041] The timing control module 10 includes a frequency division counter 100 and an enabling circuit 101, wherein the enabling circuit 101 receives an external signal, the external signal is the outpu...

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Abstract

The invention provides a light-emitting diode soft start circuit which comprises a time sequence control module and an internal current source module. The time sequence control module includes a frequency division counter and an enable circuit. The enable circuit receives an external signal. When an external signal potential is changed, the enable circuit triggers the frequency division counter to start counting, and the frequency division counter sends at least one control signal. The internal current source module comprises at least one mirror current source and at least one control switch. The at least one control switch controls the switch-on and switch-off of the at least one mirror current source according to the at least one control signal.

Description

technical field [0001] The invention relates to a light-emitting diode soft-start circuit, in particular to a light-emitting diode soft-start circuit applied to an AC-DC light-emitting diode drive current circuit. Background technique [0002] figure 1 An existing ripple-removing light-emitting diode (LED) drive circuit is shown, including various components as shown in the figure, wherein the current source IAC has a ripple, and the node CMPOUT is the output terminal of the comparator CMP. When the node CMPOUT When the voltage is high, the switch SU is turned on, and when the voltage of the node CMPOUT is low, the switch SD is turned on. In addition, it also includes NMOSFET power tube M1, error amplifier EA, and current source IU and current source ID as internal current reference sources. [0003] The implementation method of removing the ripple is by controlling the non-inverting input terminal of the error amplifier EA, that is, the voltage ripple of the node VC, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
CPCY02B20/40
Inventor 庄华龙周松明
Owner DIOO MICROCIRCUITS CO LTD