Constant-power control driving circuit and driving power supply

Abstract

The invention relates to a constant-power control driving circuit and a driving power supply. The driving power supply comprises a constant-power control unit, a constant-voltage control unit and a constant-power control unit, wherein the constant-power control unit is connected with a negative output end of a power supply and is used for sampling a voltage of the negative output end and generating a current sampling signal, the constant-voltage control unit is connected with a positive output end of the power supply and is used for sampling a voltage of the positive output end and sampling avoltage sampling signal, the constant-power control unit is connected with the constant-current control unit and the constant-voltage control unit and is used for outputting a constant-current adjustment signal and a constant-voltage adjustment signal during constant-power adjustment, the constant-current control unit is used for outputting a first adjustment signal to adjust a working frequency of a primary side of the power supply according to the current sampling signal and the constant-current adjustment signal, meanwhile, the constant-voltage control unit is used for outputting a second adjustment signal to adjust a working frequency of a secondary side of the power supply according to the voltage sampling signal and the constant-voltage adjustment signal so as to achieve constant-power output of the power supply. By the driving power supply, the effects of overload application prevention and fool prevention are achieved, and the working range of the power supply can be expanded.

Description

technical field [0001] The present invention relates to the technical field of driving power supply, and more specifically, relates to a constant power control driving circuit and a driving power supply. Background technique [0002] At present, LED lighting fixtures have become a necessity of life. LED light sources have the advantages of environmental protection, energy saving, long service life, and low driving voltage. They are considered to be the most promising lighting sources in the 21st century, especially suitable for offices, classrooms, shopping malls, and parking lots. , waiting rooms, subways, tunnels, street lights and other public places that require long-term lighting. [0003] In the existing scheme design of LED power supply, a constant current control module is usually used to control the output current, so that the LED load works in a constant current state to ensure the safety of the LED. This scheme is suitable for a narrow range of voltage and curren...

AI Technical Summary

Problems solved by technology

But this method has a defect, such as increasing the output current without a corresponding decrease in the output voltage will lead to output overpower use P↑=U*I↑

Once the user's load lamp is connected to the wrong power, it will directly lead to product function failure or damage

[0005] Traditional LED power supply output is divided into two independent units, constant current control and constant voltage control. When adjusting the output constant current, the constant voltage control will not be affected. Because the current specifications of client-side lamps are different, the products must be designed It is convenient for customers to adjust the reserved current in the application. When the output current is increased, because the voltage does not change, there is a risk of over-power application during use: P↑=U*I↑

For example, at constant voltage, the current needs to be lowered accordingly, but since the constant current control and constant voltage control are two independent units, there is a risk of wrong adjustment during adjustment, resulting in overcurrent use

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