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Devices to prevent over-adjustment of current-limiting circuits

A current-limiting circuit and circuit module technology, applied in circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve problems such as destroying chips, generating current or voltage, and spikes , to achieve a good protective effect

Active Publication Date: 2017-07-21
SG MICRO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This situation where the output current becomes zero for a short time will bring risks to the upstream power supply, such as the peripheral inductance and capacitance of the upstream power supply, thus generating a current or voltage spike and destroying the chip

Method used

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  • Devices to prevent over-adjustment of current-limiting circuits
  • Devices to prevent over-adjustment of current-limiting circuits
  • Devices to prevent over-adjustment of current-limiting circuits

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Experimental program
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Embodiment Construction

[0027] Below with the accompanying drawings ( Figure 2-Figure 8 ) to illustrate the present invention.

[0028] figure 2 It is a schematic diagram of the device implementing the present invention to prevent excessive adjustment of the current limiting circuit, wherein the power MOS transistor M1 and the induction MOS transistor M2 are both NMOS transistors. image 3 It is a comparative schematic diagram of the output current Iout~t time curves of the prior art device and the device of the present invention in the current limiting state. Figure 4 yes image 3 Schematic diagram of the equivalent circuit of the current limit adjustment of M4 in the conduction phase. Figure 5 It is a schematic diagram of the device implementing the present invention to prevent excessive adjustment of the current limiting circuit, wherein the power MOS transistor M11 and the induction MOS transistor M21 are both PMOS transistors. Figure 6 yes Figure 5 Schematic diagram of the equivalent ci...

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Abstract

A device to prevent over-adjustment of the current limiting circuit. This device prevents the output current from being zero for a short time during current limiting to better protect the safety of the upstream power supply. It includes a dual MOS tube structure consisting of a power MOS tube combined with an induction MOS tube. The gate of the power MOS transistor is interconnected with the gate of the induction MOS transistor, the output current end of the power MOS transistor is connected to the voltage output end, the source-drain current input end of the power MOS transistor is connected to the source of the induction MOS transistor The leakage current input ends are all connected to the voltage input end, the source-leakage current output end of the induction MOS tube is connected to the current limiting circuit module, the source-leakage current output end of the power MOS tube is directly connected to the voltage output end, and the current limiting circuit module Respectively connect the voltage output terminal, the grid voltage node and the edge-triggered pulse delay circuit module, the edge-triggered pulse delay circuit module of the current limiting circuit module is connected to the grid voltage node through the selective conduction MOS transistor, and the selective conduction MOS The tube is connected to the voltage output terminal or the voltage input terminal through the transition MOS tube.

Description

technical field [0001] The invention relates to current limiting circuit technology, in particular to a device for preventing excessive adjustment of the current limiting circuit. The device prevents the output current from being zero for a short time during current limiting to better protect the safety of the upstream power supply. The over-adjustment refers to the moment when the chip output current is zero in the adjustment of the output current of the chip by the current-limiting circuit when the load switch chip with the current-limiting circuit suddenly changes to the current-limiting state in the normal working state, for example, several microseconds to several During the period of one hundred microseconds, the output current of the chip is zero. Background technique [0002] When the output port encounters hot plugging, the equivalent resistance of the downstream load suddenly decreases or the ground is suddenly shorted, the chip (especially the high-current switchi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02
Inventor 郑辰光
Owner SG MICRO
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