Method and device for quickly starting power supply and stably entering and exiting standby mode

Abstract

The invention relates to a method and device for quickly starting a power supply and stably entering and exiting a standby mode, and the method comprises the following steps of: compiling an algorithm according to the characteristics of different loads and designing corresponding hardware by utilizing a primary side controller and a secondary side controller with a standby mode to realize quick and consistent starting and quick entering and exiting of the standby process; therefore, the purposes of minimum standby power consumption, response time shortening and startup time consistency improvement are achieved. Compared with the prior art, the method has the advantages of stable and reliable startup and quick in-out standby, so that the startup consistency is improved, the startup and in-out standby time is shortened, and the standby power consumption is reduced.

Description

technical field [0001] The invention relates to an LED power supply, in particular to a method and device for quickly starting up the power supply and stably entering and exiting standby. Background technique [0002] With the continuous development of technology, the market has put forward higher and higher requirements for LED power supplies, especially in the high-end market. The standby power consumption is set towards the goal of 0.2W; and the requirement for faster system response, fast and consistent boot time and response time has also entered the DALI 2.0 standard, which requires that the standby wake-up is a very fast and stable process. In addition, in practical applications, all the lights are not turned on at the same time when the power is turned on, resulting in the so-called popcorn phenomenon, which greatly reduces people's visual experience. [0003] In order to achieve 0.2W standby, a separate AC / DC standby power supply can be added, but this will increas...

AI Technical Summary

Problems solved by technology

If the system requires the driver to turn on the lights at this time, Vbus will quickly drop to the energy required by the load, and the front-end control chip has not started to operate, it will cause the lights to flash and then go out, and the follow-up response is very slow

[0008] 2) In order to ensure the quality of PF / THD in the single-stage PFC flyback circuit, the response speed of the control loop is required to be slow, and the negative overshoot when entering the standby state and suddenly turning on S1 is likely to cause the malfunction of the circuit

[0009] 3) Conversely, when S1 is suddenly closed when it is about to exit standby, it will cause an overshoot of Vbus

This positive overshoot causes the cost of component selection to increase, the volume increases, the system overvoltage misjudgment, and the possible flickering of the LED load, the most important thing will still be as described in 1), further reducing the system response time ;

[0010] 4) In addition, Vbus will also produce overshoot when starting up. If you turn on DC / DC to supply power to the LED during the overshoot, you will see flickering. If you detect that Vbus is stable and then turn on the light, it will be caused by inconsistencies in product components. The lighting time is inconsistent, and the so-called popcorn phenomenon is seen

What's worse, the possible Vbus overshoot at startup will cause the primary side control chip to have insufficient Vcc power supply and start restarting, thus further prolonging the startup time of some power supplies and exacerbating the difference in startup time

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