Controller and method for dimming light-emitting diodes
A technology of light-emitting diodes and controllers, applied in the direction of light sources, electric light sources, lighting devices, etc.
Active Publication Date: 2018-06-19
LEADTREND TECH
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] In the prior art, because the digital dimming mode and the analog dimming mode applied to light-emitting diode dimming have their own advantages, although the user can set the driving circuit of the light-emitting diode to operate in digital dimming mode or Analog dimming mode, but the driving circuit of the light emitting diode must have different pins to receive the external signal corresponding to the digital dimming mode and the analog dimming mode, or the printed circuit board should be modified accordingly, causing the existing technology to be difficult for users not a good choice
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0040] Please refer to figure 1 , figure 1 It is a schematic diagram of a controller 200 for dimming a light-emitting diode 100 disclosed in the first embodiment of the present invention, wherein a secondary side SEC of a power converter 216 is used to generate an output voltage VOUT to drive the light-emitting diode 100, And the controller 200 is located at the secondary side SEC of the power converter 216 . Such as figure 1 As shown, the controller 200 includes a PWM pin 202 , a low-pass filter 204 , a frequency detection unit 206 and a control signal generation module 208 . Such as figure 1 As shown, the pulse width modulation pin 202 is used to receive a pulse width modulation signal PWMS generated by a microcontroller 210 . The low-pass filter 204 is coupled to the PWM pin 202 for generating a DC signal DS according to the PWM signal PWMS. The frequency detection unit 206 is coupled to the pulse width modulation pin 202 for generating a logic value LV according to a ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a controller for dimming a light-emitting diode and a method. The controller comprises a pulse width modulation pin, a low-pass filter, a frequency detection unit and a control signal generation module, wherein the low-pass filter generates a direct current signal according to a pulse width modulation signal generated by a microcontroller; the frequency detection unit generates a logic value according to a critical value and the pulse width modulation signal; the control signal generation module generates a switching control signal to a first switch which is connected with the light-emitting diode in series according to the direct current signal, the logic value, the reference voltage and the pulse width modulation signal; when the frequency of the pulse width modulation signal is lower than the critical value, the controller enters a digital dimming mode; and when the frequency of the pulse width modulation signal is higher than the critical value, the controller enters an analogue dimming mode. Therefore, a printed circuit board does not need to be correspondingly modified and the added burden is not increased.
Description
technical field [0001] The present invention relates to a controller and method for dimming light-emitting diodes, in particular to a controller and method for dimming light-emitting diodes that can realize digital dimming mode and analog dimming mode on the same pin according to the frequency of pulse width modulation signals controller and method. Background technique [0002] The digital dimming mode and the analog dimming mode applied to light-emitting diode dimming have their own advantages. For example, the analog dimming mode has the following advantages: first, better color saturation in the analog dimming mode; ), there is a large product design space; third, the analog dimming mode will not produce water ripples, so the analog dimming mode is more friendly to the human eye, that is to say, it has a marketing theme; fourth, the analog dimming mode produces The frequency of electromagnetic waves falls within the range (1Hz-30kHz) regulated by the Swedish Federation...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 李敬赞
Owner LEADTREND TECH