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Power stage circuit with charge current reduction

A technology of inductor current and overcurrent, applied in the field of frequency modulation overcurrent protection method and its circuit, which can solve the problems of excessive current, component damage, output voltage drop, etc.

Active Publication Date: 2020-09-22
ELITE SEMICON MEMORY TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the output terminal is short-circuited or a large current is drawn instantaneously, the output voltage of the output terminal Vout will drop, or the minimum on-time of the high side exceeds the conversion ratio time of the duty cycle (D=Vout / (Vin×fsw)), Make the current of HS during the conduction period of each high-side switch be greater than the current of HS during the conduction period of the previous high-side switch, such as Figure 2A shown, when the inductor current I L When the continuous rise is not effectively suppressed and the circuit continues to operate, it may cause excessive current and even damage the components

Method used

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  • Power stage circuit with charge current reduction
  • Power stage circuit with charge current reduction
  • Power stage circuit with charge current reduction

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Embodiment Construction

[0041] Embodiment of frequency-modulated overcurrent protection method and circuit for voltage regulator

[0042] Please also refer to figure 1 with image 3 , image 3 It is a flow chart of the frequency modulation overcurrent protection method provided by the embodiment of the present invention. The frequency-modulated overcurrent protection method of this embodiment is used for voltage regulators, such as figure 1 As shown, the voltage regulator has a high-side switch 120 , a low-side switch 130 and an inductor 140 . The high-side switch 120 is electrically connected to the voltage input terminal Vin and the first terminal of the inductor 140 , the low-side switch 130 is electrically connected to the first terminal of the inductor 140 and the ground terminal 150 , and the second terminal of the inductor 140 is connected to the voltage output terminal Vout. The high-side switch 120 and the low-side switch 130 can be, for example, transistor switches, but the invention is...

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Abstract

The present invention provides a frequency-modulated overcurrent protection method for a voltage regulator, and the voltage regulator is provided with a high-side switch, a low-side switch, and an inductor. The method comprises the following steps: firstly, during the switching-on of the low-side switch, comparing an inductive current signal of the voltage regulator with a low-side switching-on reference current signal to obtain a crossover interval, in which the inductive current signal is greater than the low-side switching-on reference current signal; secondly, reducing the frequency of thepulse width modulation signal of the voltage regulator linearly according to the time length of the crossover interval, so that the condition that the voltage regulator generates overcurrent is avoided.

Description

technical field [0001] The present invention relates to an over-current protection method, and in particular to a frequency-modulated over-current protection method for a voltage regulator and a circuit thereof. Background technique [0002] Please refer to figure 1 , figure 1 is the circuit diagram of a conventional voltage regulator. A voltage regulator is a voltage adjustment circuit used to adjust an input voltage to an output voltage. A general voltage regulator has a high-side switch 120 , a low-side switch 130 and an inductor 140 , and the high-side switch 120 and the low-side switch 130 are controlled by the control circuit 110 . The high-side switch 120 is electrically connected to the voltage input terminal Vin and the first terminal of the inductor 140 , the low-side switch 130 is electrically connected to the first terminal of the inductor 140 and the ground terminal 150 , and the second terminal of the inductor 140 is connected to the voltage output terminal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158
CPCH02M3/1584
Inventor 杨曜玮
Owner ELITE SEMICON MEMORY TECH INC