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Over-current detection circuit of power switch

A power switch and overcurrent detection technology, which is applied in the direction of measuring electrical variables, measuring current/voltage, and measuring devices, can solve problems such as protection failure, premature protection, and device damage, and achieve overcurrent detection and high-precision overcurrent detection. The effect of flow detection

Pending Publication Date: 2016-05-04
SHENZHEN RUI ZHI CHEN TECH
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Problems solved by technology

If the over-current detection point is set too low, it will lead to premature protection under heavy load; if the over-current detection point is set too high, it will cause protection failure and damage the device

Method used

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  • Over-current detection circuit of power switch
  • Over-current detection circuit of power switch
  • Over-current detection circuit of power switch

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Embodiment Construction

[0036] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0037] refer to figure 2 and image 3 , an overcurrent detection circuit of a power switch is provided in an embodiment of the present invention, including a sampling circuit unit 100, a division circuit unit 200, and an output signal processing unit 300; the sampling circuit unit 100 collects the drain voltage of the power switch 10, and converts it converted into a sampling current; the division circuit unit 200 obtains a reference current, and performs preset division processing on the reference current to obtain a modified reference current; the output signal processing unit 300 compares the sampling current with the reference current, and A control signal for controlling the power switch 10 to be turned on and off is output according to the comparison result.

[0038] In this embodiment, the sampling circuit u...

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Abstract

The present invention provides an over-current detection circuit of a power switch. The over-current detection circuit of the power switch comprises a sampling circuit unit, a division circuit unit and an output signal processing unit. The sampling circuit unit is configured to collect the voltage of a power switch drain and convert the voltage of the power switch drain to a sampling current; the division circuit unit is configured to obtain a reference current, perform a preset division processing of the reference current and obtain a corrected reference current; and the output signal processing unit is configured to compare the sampling current with the reference current and output control signals configured to control the switching of the power switch according to the comparison result. After the division correction of a reference current, the over-current detection circuit of power switch is able to realize high-precision over-current detection of a power switch, wherein over-current detection points are not relevant to the MOS tube technology and the VDD voltage source of the power switch.

Description

technical field [0001] The invention relates to the field of overcurrent detection circuits, in particular to an overcurrent detection circuit of a power switch. Background technique [0002] Switching amplifiers, switching power supplies, charge pumps, electronic cigarettes, etc. use the turn-on and turn-off of power MOS tube switches to achieve high-efficiency conversion of signals and energy. Such a power MOS tube switch usually has a large current flowing when it is turned on, and if the current exceeds the withstand limit of the power MOS tube switch, the power MOS tube switch may be permanently damaged. Therefore, in order to ensure the reliability of the device, the current flowing through the power MOS tube switch must be continuously detected, and the power MOS tube switch can be protected when the current is too large. [0003] The over-current detection circuit in the prior art is generally as figure 1 As shown, the PMOS power transistor switch 1 is connected to...

Claims

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Application Information

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IPC IPC(8): G01R19/165
CPCG01R19/16519
Inventor 王石武
Owner SHENZHEN RUI ZHI CHEN TECH
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