Current-limiting protection circuit
A current-limiting protection and circuit technology, which is applied in the field of circuits, can solve problems such as poor practicability, and achieve the effect of preventing excessive current and enhancing stability and reliability
Active Publication Date: 2015-10-14
EAST CHINA INST OF OPTOELECTRONICS INTEGRATEDDEVICE
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The invention is closes a current-limiting protection circuit. The current-limiting protection circuit comprises an overcurrent detection module, a power driving module and a switching control module, wherein when the value of current in a driving signal sub-circuit is higher than an overcurrent value, a fourth triode and an MOS tube form dynamic balance of cascaded negative feedback, so that the MOS tube works in a constant current region and constant current is output, and constant driving power is provided for a load; and an overcurrent signal is output through the overcurrent detection module. According to the current-limiting protection circuit, the current overcurrent value can be rapidly adjusted according to different load requirements, and a condition that the circuit reliability is reduced as the current in the driving signal sub-circuit of a driving power supply is too high, is prevented, so that the technical effects of enhancing the stability and the reliability of a driving circuit is realized, and the current-limiting protection circuit is simple and practical. A triode and MOS tube cascading form is adopted, and the dynamic balance between the triode and the MOS tube is formed through the closed loop negative feedback when the overcurrent occurs, so that the MOS tube works in the constant current region, and the overcurrent signal and the constant current are output; and the constant driving power is provided for the load to keep the capability of the driving circuit, and certain on-line maintaining time can be provided.
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