Circuit with auxiliary optocoupler and switching method thereof

Abstract

The invention discloses a circuit with an auxiliary optocoupler and a switching method thereof, the circuit is used for being connected between an output end signal and an input end feedback of a switching power supply, the circuit comprises a circuit between a primary side and a secondary side of a transformer T1, the primary side of the transformer T1 is connected to an output end Output-sine of an auxiliary optocoupler circuit through a control circuit model-1, and the secondary side of the transformer T1 is connected to an output end Output-sine of the auxiliary optocoupler circuit through a control circuit model-2. The secondary side of the transformer T1 is connected to the input end Input-signal of the auxiliary optocoupler circuit through a dimming circuit model-2; the problem that the optical coupler in the power supply is high in light attenuation decline rate due to a high-temperature environment during working can be effectively avoided, and the reliability of the switching power supply is improved.

Description

Technical field [0001] The invention involves the field of switching power supply technology. It is specifically a circuit with auxiliary optocoupler and its switching methods. Background technique [0002] In the 21st century, with the increasing number of high -power lighting equipment, under the huge use of electric pressure, enterprises have begun to put forward new requirements for the conversion efficiency of the power supply, and the switching power supply has the characteristics of high conversion efficiency.It has been widely used, but in real life, the safety performance requirements are relatively high. This is mainly due to LED prone to dead lamps, resulting in the output end voltage of the switching power supply after short circuit, which may threaten people's safety. [0003] Therefore, after considering the above -mentioned problems, the technical personnel in the art introduced the concept of isolation, and in the field of switching power supply, in addition to us...

AI Technical Summary

Problems solved by technology

[0002] In the 21st century, with the increasing number of high-power lighting equipment, enterprises began to put forward new requirements for the conversion efficiency of the power supply under the huge power consumption pressure, and the switching power supply just has the characteristic of high conversion efficiency. It has been widely used, but in real life, the safety performance requirements are relatively high, mainly because the LED is easy to die, resulting in a very high output voltage of the switching power supply after a short circuit, which may threaten human safety

However, in the process of implementing the technical solution of the invention in the embodiment of the application, the inventors of the present application found that the above-mentioned technology has at least the following technical problems: because the optocoupler is an optoelectronic device, it is easy to produce light decay when working for a long time and under high temperature conditions. , which makes the light intensity of the optocoupler insufficient, resulting in insensitive circuit feedback or high delay, which will greatly affect the current feedback loop of the switching power supply, and finally affect the output power. In severe cases, it may cause serious frequency failure of lighting equipment flash

[0005] In view of the disadvantages of the above-mentioned isolated switching power supply, it cannot meet the application requirements in many application fields, such as tunnels and other applications, which have very high requirements on the stability of the power supply for a long time, and the switching power supply used in classrooms and libraries has poor stability. It will cause stroboscopic flashes, and the probability of myopia of students in such an environment for a long time will be greatly increased

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