Novel power limiting circuit

Abstract

The invention discloses a novel power limiting circuit comprising a BM2596 chip. The signal input end of the BM2596 chip is connected to a base of a triode Q1 through a resistor R2, and an emitter of the triode Q1 is connected to a 24V power supply. A resistor R1 is connected between the emitter of the triode Q1 and the signal input end of the BM2596 chip, a capacitor C1 and a capacitor C8 in parallel are connected between the emitter and the base of the triode Q1, a collector of the triode Q1 is connected with an FB-pin of the BM2596 chip and a resistor R3 at the same time through a resistor R4, and the other end of the resistor R3 is grounded through capacitors C4, C5 and C7 in parallel and is further connected with a VOUT end. When a load is short-circuited, since the input end still continues working, the triode Q1 is in an on state, the voltage of the FB-pin of the BM2596 chip cannot become zero, and pipeline protection effect is achieved; the BM2596 chip is used for products with high requirements on power efficiency and heat emission, and is high in quality and not easy to damage.

Description

technical field [0001] The invention relates to a power limiting circuit, in particular to a novel power limiting circuit. Background technique [0002] In many applications, the power supply and the equipment are not closely connected. Most integrated power boxes have AC220V input, AC24V output and DC12V output. The polarity of DC12V was not paid attention to during installation, and the actual power-on was far behind the installation period, resulting in a long-term short circuit of DC12V, which was damaged. Contents of the invention [0003] The purpose of the present invention is to provide a novel power limiting circuit with protection function, so as to solve the problems raised in the above-mentioned background technology. [0004] To achieve the above object, the present invention provides the following technical solutions: [0005] A new type of power limiting circuit, comprising a BM2596 chip; the signal input terminal of the BM2596 chip is connected to the bas...

AI Technical Summary

Problems solved by technology

[0002] In many applications, the power supply and the equipment are not closely connected. Most integrated power boxes have AC220V input, AC24V output and DC12V output. The device did not pay attention to the polarity of DC12V and the actual power-on was far behind the installation period, resulting in a long-term short circuit of DC12V, which resulted in damage

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