Anti-surge-lock protection circuit with auxiliary power supply and low standby power consumption

Abstract

The invention discloses an anti-surge-lock protection circuit with auxiliary power supply and low standby power consumption, which comprises a current detection module, a power supply module and a drive circuit module, wherein the power supply module simultaneously supplies power to the current detection module and the drive circuit module. Two diodes DS53A and DS53B connected in series are used,the voltage of a CS pin is clamped to 1 to 1.2V by using the forward on-state voltage drop of 0.5 to 0.6 of the diodes, so that the voltage of the CS pin is always lower than 1.5V and thus short circuit protection cannot be triggered.

Description

technical field [0001] The invention relates to an anti-surge lock-up protection circuit with auxiliary power supply and low standby power consumption, belonging to the technical field of LEDs. Background technique [0002] With the country's vigorous promotion of energy-saving products, the market demand for LED drivers is increasing, and at the same time, higher requirements are put forward for ERP (Ecological Design Requirements Directive). In LED lighting applications, the no-load power consumption of drivers with power less than 250W is required to be less than 0.5W; the no-load power consumption of drivers with power greater than or equal to 250W is less than 0.5*P / 250. [0003] Except for a very small number of high-power power management chips on the market, they are designed with high-voltage startup. After startup, the IC automatically turns off the high-voltage startup circuit; most of them use high-voltage rectification to charge ICVcc through the startup chargin...

AI Technical Summary

Problems solved by technology

[0005] However, this kind of auxiliary power supply has a disadvantage that it always has a stable output; after the IC detects an abnormal state and enters protection, it needs to restart after Vcc is powered off, and it will not be powered off, which leads to the IC being in an abnormal state. There is no output when locked, and the power supply does not work. It takes a period of time (usually tens of seconds) after the power is artificially cut off to restart the work.

Especially in outdoor street lighting applications in summer thunderstorm weather, when there is a large lightning surge and the interference of the overall environment is very large, each detection pin of the IC is easy to trigger some protection and needs to be restarted after Vcc is powered off. The lights are not on in thunderstorm weather, which seriously affects the safety of public transportation

Images