Control protection circuit

Abstract

The invention relates to a control protection circuit, which comprises a driving control module with at least one path of output, and further comprises sampling amplification modules arranged on each path of output line and used for collecting electric information on the corresponding output line and amplifying and outputting the electric information; the comparison and judgment module is connected with the sampling and amplifying module to receive the electric information output by the sampling and amplifying module, compares the electric information to judge whether the current output line outputs abnormally or not and outputs a corresponding judgment signal; and the switch control module is respectively connected with the comparison and judgment module and the driving control module and is switched on or off according to the judgment signal output by the comparison and judgment module so as to control the driving control module to work or not. The circuit is simple in structure and wide in application range, and safety and stability of the circuit are improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a control and protection circuit. Background technique [0002] Compared with traditional lighting lamps, LED lamps are more and more applied to home cabinets, wardrobes, mirror cabinets and other households due to their advantages such as various shapes, high efficiency and energy saving, and adjustable color temperature and brightness. A variety of LED lighting control circuits. At present, two-wire cooling and warming color temperature adjustable lamps are mainly used in the market. The main reason is that this type of lamp circuit only needs to input two wires to realize the brightness and color temperature adjustment of the lamp, which is convenient for installation and low in cost. [0003] But no matter what type of lighting circuit, there are more or less problems of overload or short-circuit protection, especially for two-wire cooling and warming color tempera...

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Problems solved by technology

[0003] But no matter what type of lighting circuit, there are more or less problems of overload or short-circuit protection, especially for two-wire cooling and warming color temperature adjustable lighting, this kind of two-wire cooling and warming color temperature control circuit generally uses 4 bridges The MOS tube obtains the corresponding brightness and color temperature through a certain switching sequence, which makes the circuit alternately present positive and negative currents. However, the existing circuit design cannot collect the overload voltage difference when the circuit carries a negative current. If you want to To achieve data acquisition, the configured control and protection circuit will be very complicated and difficult to implement, which makes the overload and short circuit protection of such circuits become empty talk

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