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Dimming curve forming circuit, dimming curve forming method, and LED lighting device

A dimming curve and dimming control circuit technology, which is applied in the field of LED lighting devices and dimming curve forming circuits, can solve problems such as poor program commonality, low design efficiency, and different dimming curves

Active Publication Date: 2022-05-24
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The design efficiency of this approach is very low, and the dimming curves of various circuits are different, and the program commonality is very poor.

Method used

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  • Dimming curve forming circuit, dimming curve forming method, and LED lighting device
  • Dimming curve forming circuit, dimming curve forming method, and LED lighting device
  • Dimming curve forming circuit, dimming curve forming method, and LED lighting device

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Embodiment Construction

[0050] The present invention uses a control unit to generate PWM signals with different duty ratios, thereby realizing the adjustment of the output light of the LED lighting device. By detecting the operating frequency of the circuit in the lighting device and the frequency of the PWM signal, the control unit automatically retains the effective dimming point to form a dimming curve.

[0051] The control unit can be constructed by some separate components or realized by a microcontroller (MCU control circuit). In a preferred embodiment of the present invention, the control unit is a main control MCU.

[0052] Figure 4 is a schematic diagram of a circuit structure of an LED lighting device according to an embodiment of the present invention, Figure 5 Yes Figure 4 The specific schematic diagram of the main control MCU1.

[0053] The LED lighting device is a dimming circuit using a BUCK switching power supply as a driving circuit. The LED lighting device controls the brigh...

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PUM

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Abstract

The invention relates to a dimming curve forming circuit, a dimming curve forming method, and an LED lighting device. The dimming curve forming circuit is used to form a dimming curve in an LED lighting device including a BUCK dimming control circuit, and it is characterized in that the dimming curve forming circuit includes an inductance secondary coil, and the dimming curve is formed The circuit acquires the voltage waveform of the main loop inductor in the BUCK dimming control circuit by collecting the voltage waveform of the secondary coil of the inductor, and the dimming curve forming circuit detects the rising and falling edges of the voltage waveform of the main loop inductor, combining The frequency of the PWM signal applied to the BUCK dimming control circuit generates a dimming curve. The invention automatically screens effective dimming points to generate dimming curves, which not only makes human eyes feel comfortable and soft, but also improves efficiency.

Description

technical field [0001] The invention relates to a lighting device, in particular to a dimming curve forming circuit, a dimming curve forming method, and an LED lighting device. Background technique [0002] Light-emitting diodes (LEDs), as lighting sources, have the advantages of energy saving and environmental protection, and are widely used. LED dimming devices can be used in LED lighting systems to provide desired brightness according to different times, different locations and specific needs of users. LED dimming devices can not only reduce energy consumption, but also provide a comfortable lighting environment. [0003] In the LED dimming device, the conduction time control method can be used to realize multi-level brightness. In the on-time control method, the LED is turned on and off periodically. According to the brightness signal, by changing the duty cycle and / or frequency of the pulse width modulation (PWM) signal, the brightness of the LED can be controlled by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B45/325
CPCY02B20/40
Inventor 庞志伟
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD