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Power tube current detection circuit

A technology of current detection circuit and power tube, which is applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve the problems of complex structure, large power consumption, etc., achieve fast current limiting response speed, high detection current accuracy, The effect of simple structure

Active Publication Date: 2009-10-07
ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current detection accuracy of this circuit is a little lower than that of Scheme 1, but it can save an off-chip resistor. The disadvantage is that the structure of the op amp is slightly complicated and the power consumption is relatively large.

Method used

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] With the development of semiconductor technology, the required operating voltage of integrated circuits is getting lower and lower, so DC-DC (direct current-direct current) switching power supply and LDO (linear step-down regulator) are used more and more widely. Power tubes are all used in these power converters, and the technical solution of the present invention can accurately obtain the current of the CMOS power tube, which is used for current limiting of the entire circuit or for current-type PWM (pulse width modulation) DC-DC loop on the road.

[0034] see Figure 4 , is the new solution of the present invention. The current mirror composed of detection power tubes M1, M2, M3 and M4 is used to replace the operational amplifier in scheme 3, and the other structures are basically the same. In this embodiment, the detection power transistor is a MOS transi...

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Abstract

The invention relates to a power tube current detection circuit, which includes: a power tube to be tested, a power tube that matches the power tube to be tested and has a certain width-to-length ratio, and the power tube current detection circuit also includes a power tube A current mirror circuit, the current mirror circuit includes several detection power tubes, and detects the current of the power tube to be tested by the current flowing through the detection power tubes. The technical scheme of the invention has simple structure, high detection current accuracy, fast current limiting response speed, and low power consumption and manufacturing cost.

Description

【Technical field】 [0001] The invention relates to a detection circuit, in particular to a power tube current detection circuit. 【Background technique】 [0002] Power management chips such as DC-DC (direct current-direct current) switching power supply, LDO (linear step-down regulator), Charger (charger), etc., when the power tube current is needed at the beginning of power-on, output short-circuit or loop feedback, It is often necessary to detect the power tube current more accurately to deal with these situations. If the DC-DC, LDO and other chips are powered on or the output is short-circuited, if the power tube is not turned off in time or other current limiting methods are adopted, the chip may burn out in a very short time. [0003] At present, several commonly used current detection schemes are as follows: [0004] 1. Adopt precision resistance scheme [0005] see figure 1 , the technical solution uses a precision resistor in series with the power tube, and detects...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
Inventor 刘军刘坚斌
Owner ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD