Power output circuit, LED drive circuit, drive method and LED

Abstract

The invention relates to a power output circuit, an LED drive circuit, a drive method and an LED, wherein the power output circuit comprises a main control chip, a power adjustment module and a control module. According to the invention, a dialer is combined with a grounding resistor, so that the segmented dial-up power adjustment is realized; the dialer is connected with different grounding resistors and upper bias resistors for voltage division, so that different output currents are realized, and the purpose of multiple gear power is achieved; power adjustment is realized through a mode, andthe circuit output current is only related to the ratio of the grounding resistor to the upper bias resistor, so that the grounding resistor and the upper bias resistor can adopt the K-ohm resistors,the interference generated by the dialer or the line internal resistance is solved, the constant output currents with different magnitudes can be stably and accurately outputted, the cost is low, andthe reliability is high.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a power output circuit, an LED driving circuit, a driving method and an LED. Background technique [0002] With the rapid development of LED lighting technology, various lighting products continue to emerge. In today's resource-scarce environment, people's awareness of energy conservation continues to strengthen. Usually, one type of lighting is used in different environments, and corresponding needs Meet different brightness requirements, for example, a 1.2-meter LED tube may have different power requirements such as 22W, 20W, 18W, 16W, etc., and a 3-inch downlight may also have 12W, 10W, 9W, 8W, 7W, 6W, 5W For so many cumbersome power requirements, the current adjustable power LED driver has the following disadvantages: [0003] (1) Thyristor dimming type dimming drive: For traditional buildings, a large number of thyristor dimmers are installed. The choice of most people...

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Problems solved by technology

[0003] (1) Thyristor dimming type dimming drive: For traditional buildings, a large number of thyristor dimmers are installed. The choice of most people, but for the developer, this operation adds a large number of dimming circuits, which can maintain the dummy load of the SCR conduction, which greatly increases the cost and reduces the work efficiency, while for the user For example, the dimming effect used may be difficult to achieve the ideal dimming effect due to different dimmers. For commercial lighting places, it is only necessary to achieve a specific brightness, and it is impossible to maintain a consistent brightness requirement.

[0004] (2) 0-10V, PMW, DALI and other intelligent dimming drivers: this type of implementation must be implemented with a dedicated IC with a dimming port and a dedicated dimming device, and the cost is relatively high

[0005] (3) Dial code to adjust the power drive power supply: Usually this circuit has two implementation methods, using a driver IC with an analog dimming port, through the code dialing method, different resistor voltage dividers are generated to realize the power adjustable function. This implementation must use a dedicated control IC with analog dimming pins, and the design is also limited to a certain extent.

The second implementation method is to adjust the power by connecting a resistor in parallel to the IC sampling pin, but the IC sampling pin usually only has a voltage of a few tenths of a volt, which is susceptible to interference, and the internal resistance of a mechanical switch such as a dial switch varies greatly. , making the consistency of the power poor

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