A Protection Circuit for Preventing Current from Inverting Power Supply
A protection circuit and current backflow technology, which is applied to emergency protection circuit devices, electrical components, etc., and can solve problems such as burnout of the external circuit power supply of integrated circuits
Inactive Publication Date: 2018-08-14
XIANGTAN UNIV
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Problems solved by technology
If there is no corresponding protection circuit inside the integrated circuit, such as figure 1 As shown, it may cause the current of the external circuit to flow into the power port VDD through the parasitic diode, causing the excessive current to burn out the integrated circuit itself, the external circuit and even the power supply.
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[0011] Such as figure 2 In the anti-current backflow protection circuit 301 shown, the control signal DI and the detection signal CTR act on the gate of the first PMOS transistor MP1 through the first OR gate OR1 and the first NMOS transistor MN1 to control the driving of the external load by MP1. The inverting input terminal of the comparator CMP1 is connected to the output port Vout, the non-inverting input terminal is connected to the power supply VDD, and the output port is connected to the gate of the MN1 and the gate of the MP4 transistor. The drain of MN1 is connected to the control signal DI, the substrate is grounded, and the source is connected to the gate of MP1 and the drain of MP4. The source of MP4 is connected to Vout, and the potential of the substrate is determined by MP5 and MP6. The source of MP5 is connected to the power supply VDD, the gate is connected to Vout, the substrate and drain are connected to the substrate of MP4, and the substrate and drain of...
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The invention discloses a protection circuit for preventing an external circuit current from flowing into a power source port of an integrated circuit; the protection circuit comprises a first OR-gate, a first comparator, a first PMOS tube, a second PMOS tube, a third PMOS tube, a fourth PMOS tube, a fifth PMOS tube, a sixth PMOS tube, and a first NMOS tube; a detection signal CTR is acted for an input end of the first OR-gate, a control signal DI controls the on-off of the first PMOS tube through the first OR-gate and the first NMOS tube, and provides the current for the external load from a source end of the first PMOS tube. The protection circuit can effectively prevent the current from flowing into the power source port of the integrated circuit when the output port is located at the abnormal voltage, thereby protecting the circuit from being damaged. The protection circuit has the characteristics of being simple in structure and good in protection performance.
Description
technical field [0001] The invention relates to an overcurrent protection circuit, in particular to a protection circuit for preventing current from flowing into a power supply. Background technique [0002] In integrated circuit applications, its ports or pins are connected to external circuits, such as figure 1 As shown, under most conditions, the external circuit voltage will be lower than the internal power supply voltage of the integrated circuit. , the voltage of the external circuit may be higher than the power supply voltage inside the integrated circuit, especially in the application of interface integrated circuits. If there is no corresponding protection circuit inside the integrated circuit, such as figure 1 As shown, it may cause the current of the external circuit to flow into the power port VDD through the parasitic diode, causing the excessive current to burn out the integrated circuit itself, the external circuit and even the power supply. Contents of th...
Claims
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IPC IPC(8): H02H11/00
CPCH02H11/006
Inventor 金湘亮张文杰杨红娇谢亮汪洋
Owner XIANGTAN UNIV