DC-DC conversion circuit overcurrent protection circuit, method and display panel

Abstract

The invention relates to a DC-DC conversion circuit overcurrent protection circuit, method and display panel. The overcurrent protection circuit comprises a first comparator (OP1) for comparing a DC voltage and a DC voltage. An OCP detect voltage (V1) and a first reference voltage (Vref1) in a DC conversion circuit output a first comparison result (EN1) to a logic processor; A second comparator (OP2) for comparing the OCP detection voltage (V1) and the second reference voltage (Vref2), and outputting a second comparison result (EN2) to the logic processor; A logic processor that judges DC based on the first comparison result (EN1) and the second comparison result (EN2); DC convert that working state of the circuit and output the corresponding control signal to the OCP current limiter; OCPcurrent limiter, according to the control signal, the corresponding overcurrent protection operation is performed on the DC-DC conversion circuit. The invention not only realizes the functions of theoriginal overcurrent protection circuit and the magnitude of the current triggering the overcurrent protection, but also limits the magnitude of the output current after the overcurrent protection occurs to prevent the risk of smoke and fire caused by the large current.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an overcurrent protection circuit, method and display panel of a DC-DC conversion circuit. Background technique [0002] The power management chip (PM IC) is a chip (IC) that provides voltage and current in the display panel driver. Its main function is to convert the voltage into various voltages required by the display panel through a DC-DC (direct current-direct current) conversion circuit. [0003] The way of OCP (Over Current Protection, over-current protection) of the current DC-DC conversion circuit is generally to prevent the current value from increasing after the OCP is triggered, and at the same time the output voltage will gradually decrease. This may cause two consequences, one It is a part of the voltage drop, but it does not trigger the output undervoltage protection. One is that the output voltage drops too much and triggers the undervoltage protection. [0004]...

AI Technical Summary

Problems solved by technology

[0003] The way of OCP (Over Current Protection, over-current protection) of the current DC-DC conversion circuit is generally to prevent the current value from increasing after the OCP is triggered, and at the same time the output voltage will gradually decrease. This may cause two consequences, one It is a part of the voltage drop, but it does not trigger the output undervoltage protection. One is that the output voltage drops too much and triggers the undervoltage protection.

[0004] When the undervoltage protection is not triggered, due to the large output current, the entire DC-DC conversion circuit will work in a dangerous state, and even trigger the risk of smoke and fire

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