Circuit for memorizing states of paths A and B through switching of mechanical switch after power failure
A mechanical switch and circuit technology, applied in electric light sources, electrical components, electroluminescent light sources, etc., can solve the problems of no power-off memory, inability to realize power-off memory brightness, etc., and achieve the effect of accurate current
Pending Publication Date: 2019-07-02
东莞市德奥智能电子有限公司
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Problems solved by technology
[0003] The purpose of the present invention is to provide a circuit that switches and memorizes the state of A and B circuits after power-off by a mechanical switch, so as to solve the problem that the existing switch brightness adjustment LED circuit adopts a functional chip without the function of power-off memory, that is to say, every The brightness of the first time the light is turned on is in a fixed gear, and each time you have to manually press it several times to adjust to the desired gear, it is impossible to realize the power-off memory brightness, and it can be adjusted once to solve the above-mentioned background technology. proposed question
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[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0018] see Figure 1-2 , the present invention provides a technical solution: a circuit that switches memory A and B circuits after power failure by a mechanical switch, including an AC / DC conversion circuit, a U-shape filter circuit, a peak absorption circuit, a secondary DC conversion and a step-down A rectification filter circuit and an MCU control circuit, the AC / DC conversion circuit is electrically connected to the U-shape filter circuit, the U-shape fil...
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The invention discloses a circuit for memorizing states of paths A and B through the switching of a mechanical switch after a power failure. A pi-shaped filter circuit is electrically connected with apeak absorption circuit, and the peak absorption circuit is electrically connected with a secondary direct current conversion and voltage reduction rectification filter circuit; the secondary directcurrent conversion and voltage reduction rectification filter circuit is electrically connected with an MCU control circuit, and the MCU control circuit is connected with a PWM control circuit A, a PWM control circuit B and the mechanical switch. According to the invention, through four positions and four switching modes of the mechanical switch, such as the first switching mode and the 100% brightness A, the second mode and the 100% brightness A, the third mode and the 20% brightness A, and a fourth mode and the 20% brightness B, no matter what mode is reached, the circuit can memorize and switch four kinds of brightness. Therefore, the current magnitude can be freely combined. Restarting from the fourth mode, the brightness can be memorized at the fourth 20%brightness B, and the circuitcan memorize the current power-off situation, and a customer can see switch different positions of the switch and different the memory modes.
Description
technical field [0001] The invention belongs to the technical field of LEDs, and in particular relates to a circuit which uses a mechanical switch to switch and memorize the states of circuits A and B after power failure. Background technique [0002] At present, the switch brightness adjustment LED circuit on the market uses a function chip, which does not have the function of power-off memory. Adjusting to the desired gear, it is impossible to realize the power-off memory brightness, and once it is adjusted, it will be the same brightness in the future, and the memory mode is single. Contents of the invention [0003] The purpose of the present invention is to provide a circuit that switches and memorizes the state of A and B circuits after power-off by a mechanical switch, so as to solve the problem that the existing switch brightness adjustment LED circuit adopts a functional chip without the function of power-off memory, that is to say, every The brightness of the fi...
Claims
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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00H05B45/10
Inventor 陈华
Owner 东莞市德奥智能电子有限公司