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Edge signal counting device and led driver

An edge signal and counting device technology, applied in the circuit field, can solve the problems of not being able to use power lines, only power lines, ground lines, and control LEDs, etc., to achieve the effect of chip integration

Active Publication Date: 2017-05-10
罗小华
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  • Claims
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Problems solved by technology

[0007] Existing control devices based on the above protocol can obtain various color effects by controlling the duty cycle of red, green, and blue LEDs, but all need to transmit control signals through more than one signal line, and cannot control LEDs through power lines. It cannot be applied to products with only power wires and ground wires

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  • Edge signal counting device and led driver
  • Edge signal counting device and led driver
  • Edge signal counting device and led driver

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Embodiment Construction

[0036] The present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0037] Such as figure 1 As shown (the part shown in the dotted line box), the edge signal counting device of the present embodiment includes:

[0038] The edge counting unit is used to count the edges of the edge signal input by the power line, and output the counting result;

[0039] The charging unit is used to provide power supply levels for the edge counting unit and the initialization unit according to the edge signal input by the power line, charge when the edge signal is high level, and discharge when the edge signal is low level;

[0040] The initialization unit is used to initialize the edge counting unit according to the power supply level.

[0041] figure 2 The edge counting unit of this embodiment includes several D flip-flops triggered by rising clock edges connected in series with low-level reset, and the counting results ar...

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Abstract

The invention discloses an edge signal counting device and an LED driver. The edge signal counting device includes an edge counting unit for counting the edges of an edge signal input by a power line and outputting the counting result; a charging unit for counting the edges The unit and the initialization unit supply power, charge when the power line signal is high level, and discharge when the power line signal is low level; the initialization unit is used to initialize the edge counting unit according to the power supply level. The LED driver includes an edge signal counting device and a driving unit for driving the LED according to the counting result of the edge signal counting device. The present invention uses the edge signal counting device to count the edge signals input by the power line to realize the control of the drive unit and then drive the LED to complete the colorful light emission. Only one power line and ground line are needed, and no additional signal lines are needed, which is beneficial to circuit realization. LED driver chip.

Description

technical field [0001] The invention relates to the field of circuit technology, in particular to an edge signal counting device and an LED driver. Background technique [0002] Light-emitting diodes (Light Emitting Diode, LED) are widely used in architectural lighting, automobile head and tail lights, landscape lights, festival lights, etc. LED has significant advantages such as high efficiency, good directionality, good color stability, high reliability, long life, small size, and environmental safety. It is especially suitable for landscape lighting and festival lighting. The red, green and blue three-color LEDs can be controlled in seven or more colors through the control device, so that the LED lamps can present a wonderful and beautiful scene. The control device is the key part of the LED lighting system. [0003] In recent years, with the application of integrated circuit technology and computer technology, LED control methods based on DMX512 protocol, DALI protocol,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00H05B47/10
Inventor 罗小华
Owner 罗小华
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