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Frequency conversion multi-phase voltage regulator and its control method

A voltage regulator, multi-phase technology, used in regulating electrical variables, control/regulating systems, instruments, etc.

Active Publication Date: 2011-01-19
ASUSTEK COMPUTER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016]However, the above-mentioned voltage regulator with variable frequency function is not at the optimum efficiency of the voltage regulator

Method used

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  • Frequency conversion multi-phase voltage regulator and its control method
  • Frequency conversion multi-phase voltage regulator and its control method
  • Frequency conversion multi-phase voltage regulator and its control method

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] Bpk=(1 / 2)*ΔB=(L*ILP*108) / (2*A*N)

[0044] ILP=(Vin-Vcore)*D*(1 / L)*(1 / Fsw)

[0045] And Fsw is the switching frequency of the voltage regulator; Bpk is the hysteresis loss of the inductor (HysteresisLoss); V is the voltage on the inductor; ΔB is the magnetic flux (Flux Density) of the inductor; L is the inductance value of the inductor; ILP is the output of the inductor Ripple Current; A is the cross-sectional area of ​​the inductor; N is the number of core turns of the inductor; D is the duty cycle of the voltage regulator, defined as Vcore / Vin.

[0046] It can be seen from the above formula that increasing the switching frequency (Fsw) of the pulse wave signal (PWM signal) in the voltage regulator can reduce the ripple current (ILP); and the reduced ripple current (ILP) can further reduce the hysteresis loss (Bpk ); Finally, the reduced hysteresis loss (Bpk) can reduce the core power loss of the inductor.

[0047] However, according to actual experimental and measure...

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Abstract

The invention relates to a multiphase voltage regulator with a variable-frequency and the control method thereof applying to the multiphase voltage regulator. The multiphase voltage regulator is arranged on a mainboard and connected to a central processing unit comprising the following steps: detecting the current of the central processing unit, supplying power for the central processing unit by the multiphase voltage regulator using M phase and a first switching frequency when the current of the central processing unit is higher than the current reference value; and, supplying power for the central processing unit by the multiphase voltage regulator using N phase and a second switching frequency when the current of the central processing unit is lower than the current reference value. Not only the switch between different phases is carried out by the invention, but also the frequency conversion mechanism of the switching frequency is added when the central processing unit is under low load operation (light load), thereby achieving the optimization efficiency of the voltage regulator.

Description

technical field [0001] The invention relates to a multiphase voltage regulator and its control method, in particular to a multiphase voltage regulator with a frequency conversion mechanism under light load and its control method. Background technique [0002] Generally speaking, the power supply of the central processing unit (CPU) in the computer system is not directly provided by the power supply unit (Power Supply, PSU), the main reason is that the core voltage Vcore required by the central processing unit varies according to the size of its load. Constantly changing, therefore, the core voltage Vcore required by the central processing unit may increase or decrease instantaneously, and the power supply cannot directly respond to such a sudden change. In order to solve this problem, a voltage regulator (Voltage Regulator Module, VRM) dedicated to powering the CPU is provided on the motherboard, which is mainly composed of a pulse width modulation control unit (Pulse Width ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5395G05F1/10G06F1/26
Inventor 林志伟黄农哲许志琬
Owner ASUSTEK COMPUTER INC