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Over-current detection circuit

An overcurrent detection and circuit technology, applied in the direction of measuring electrical variables, measuring current/voltage, measuring devices, etc., can solve the problem that the blanking time is difficult to cover, the conduction delay and transmission delay of the power switch tube are not a stable value, susceptibility to other factors, etc.

Pending Publication Date: 2019-01-18
58TH RES INST OF CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the turn-on delay and transmission delay of the power switch are not a stable value, and are easily affected by other factors. A fixed blanking time is difficult to cover all situations

Method used

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  • Over-current detection circuit

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Embodiment 1

[0027] The present invention provides an over-current detection circuit used in high-speed switching converters, the structure of the over-current detection circuit is as follows figure 1 As shown, it includes a ringing compensation circuit and an overcurrent detection comparator; the ringing compensation circuit is used to avoid the false triggering of the overcurrent protection caused by the ringing voltage of the switching node of the power tube, and the overcurrent detection comparator , which is used to compare the operating current of the power tube with the current-limiting threshold and generate an over-current protection signal.

[0028] Specifically, please continue to figure 1 . The ringing compensation circuit includes a main turn-on signal MAIN_ON, and simultaneously accesses the buffer buf, the delay unit delay, the inverter inv and the first SR flip-flop SR 1 and the buffer buf is connected to the HDRV pin; the output of the delay unit delay is connected to th...

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Abstract

The invention discloses an over-current detection circuit, and belongs to the technical field of protection circuits. The over-current detection circuit includes a ringing compensating circuit and anover-current detection comparator. The ringing compensating circuit is used for preventing an over-current protection false triggering condition caused by a ringing voltage of a power tube switching node, and the over-current detection comparator is used for comparing a working current of a power switch tube with a current limiting threshold value to generate an over-current protection signal. Theover-current detection circuit is used in a switching converter, especially in a high-frequency switching converter. The over-current protection false triggering condition caused by the ringing voltage of the power switch node can be avoided, it is ensured that the working current is sampled when the power switch is actually turned on, and the operation is not affected by conduction delay and transmission delay of the power switch tube.

Description

technical field [0001] The invention relates to the technical field of protection circuits, in particular to an overcurrent detection circuit. Background technique [0002] In the prior art, DC-DC switching regulators usually have some protection circuits, one of which is called overcurrent protection, which is used to detect the current flowing through the power tube; when the current exceeds the normal operating current, the overcurrent detection The circuit generates an overcurrent signal to turn off the power switch tube to prevent damage to the switching regulator. [0003] Usually the over-current detection circuit provides cycle-by-cycle current limiting, sampling the operating current during the on-time period of a switching cycle. For example, in voltage-mode step-down switching converters, the on-resistance of the upper transistor or a small resistor connected in series with the upper transistor is usually used as a sampling resistor, and the operating current is ...

Claims

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Application Information

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IPC IPC(8): G01R19/165H02M1/32
CPCH02M1/32G01R19/165G01R19/16523H02M1/325
Inventor 黄少卿马文超罗永波宣志斌肖培磊
Owner 58TH RES INST OF CETC
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