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Circuit with dynamic adjustment current limiting value

A current-limiting circuit and dynamic adjustment technology, applied in the direction of adjusting electrical variables, control/regulation systems, electrical components, etc., can solve problems such as the reduction of inductor current

Active Publication Date: 2018-09-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to some delay in the current sense loop, it is possible for the inductor current to drop to a negative value, which is usually undesirable

Method used

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  • Circuit with dynamic adjustment current limiting value

Examples

Experimental program
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Embodiment 1

[0031] Such as figure 1 An adaptive current limiting circuit shown includes an adaptive current limiting circuit 20: a current detection & differential circuit, a comparison circuit & a current limiting circuit, a driving circuit 30 and a basic topology 30 of a buck switching power supply, including a power transistor NM 1 , NM 2 , inductance L, capacitance C and load resistance R load ; The input terminal V of the current detection & differential circuit module b connected to the sense resistor R sense On, the output terminal is connected to the input terminal of the comparison circuit & current limiting circuit module; the output signal Ctr of the comparison circuit respectively connected to the threshold control switch NM of the current limiting circuit module on; the output terminal LIP of the current limiting module is connected to the driving circuit.

Embodiment 2

[0033] Based on the principles of the foregoing embodiments, this embodiment takes n=2 as an example for detailed description.

[0034] Such as figure 2 As shown, the current detection & differentiation circuit includes a transistor Q ;FET NM Resistance R Capacitance C 4 and operational amplifier Amp, its voltage and current bias as figure 2 shown. The current detection & differential circuit converts the abnormal change of the inductor current into a voltage V sense , and then convert the abnormal variation of the inductor current into the output voltage V through the differential circuit b . The voltage V by the comparator circuit b Quantized to three-bit control signal Ctr , the control signal realizes the adjustment of the dynamic threshold voltage by controlling the switch of the threshold voltage of the current limiting circuit.

[0035] The circuit for dynamically adjusting the current limiting threshold of the present invention also includes a driving c...

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Abstract

The invention discloses a circuit with a dynamic adjustment current limiting value. The circuit comprises an adaptive current limiting circuit, wherein the adaptive current limiting circuit is connected with a drive circuit and is used for monitoring a change of an inductor current in real time and appropriately improving a threshold of the current limiting circuit when an abnormal change of the current is detected, so a system is adjusted in advance and a situation that the inductor current is negative is avoided; and the drive circuit, wherein the drive circuit is connected with a basic topology structure of buck and is used for processing PWM and CLK signals into drive signals TG and BG, the basic topology structure of the buck matches the drive circuit and is used for reducing an inputvoltage Vin to a required voltage. Through real-time monitoring of a current detection circuit, a differential circuit and a comparison circuit for the inductor current, the abnormal change of the inductor current is detected in advance and an appropriate current limiting threshold is selected, so the situation that the inductor current is negative is avoided, and the integrated performance of the system is improved.

Description

technical field [0001] The invention relates to the field of power management, in particular to a circuit with a dynamically adjustable current limiting threshold. Background technique [0002] A switching power supply system usually includes some protection circuits, such as: temperature protection circuit, voltage protection circuit, circuit protection circuit. When an abnormality occurs in the switching power supply system, the protection circuit can protect the power supply system from being damaged. When the switching power supply system is abnormal or in a special mode, the inductor current will decrease rapidly. Due to some delay in the current sense loop, it is possible for the inductor current to drop to a negative value, which is usually undesirable. Contents of the invention [0003] In order to solve the above problems, this application proposes a circuit with dynamic adjustment of the current limit threshold, through the real-time monitoring of the inductor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158
Inventor 阙隆成孟威威邓博李小飞周云
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA