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Control circuit and method for a ripple regulator system

A technology for controlling circuits and regulators, which is applied in the direction of adjusting electrical variables, control/regulation systems, pulse duration/width modulation, etc., and can solve problems such as small ripples

Active Publication Date: 2012-08-29
RICHTEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, if a ceramic capacitor is used as the output voltage stabilizing capacitor Co, because its equivalent series resistance R3 is very small, the ripple of the output voltage Vout and the feedback voltage Vfb1 will be very small, and can even be regarded as a DC signal. It is almost impossible for the COT ripple regulator to operate under stable conditions

Method used

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  • Control circuit and method for a ripple regulator system
  • Control circuit and method for a ripple regulator system
  • Control circuit and method for a ripple regulator system

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Embodiment Construction

[0032] image 3 so figure 1 The embodiment based on the design of the circuit, wherein the equivalent series resistance R3 of the output voltage stabilizing capacitor Co is very small, so the ripple of the feedback voltage Vfb1 is very small, which can be regarded as a DC signal, such as Figure 4 The waveform 36 is shown. exist image 3 of the control circuit 10, in addition to figure 1 In addition to the PWM controller 12 , the error comparator 14 and the inverter 16 , it also includes a ripple generating circuit 30 and an offset canceling circuit 32 . The ripple generating circuit 30 generates a ripple signal Vripple synchronous with the inductor current IL and in phase with the voltage of the phase node Phs to the positive input terminal of the error comparator 14, and the ripple signal Vripple is superimposed on the feedback voltage Vfb1 to generate a large ripple wave feedback voltage Vfb2, such as Figure 4 As shown in the waveform 34 of , the problem of loop insta...

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Abstract

A control circuit and method for a ripple regulator system generate a ripple signal in-phase and synchronous with an inductor current of the ripple regulator system, and extract a ripple information proportional to the amplitude of the ripple signal. The ripple signal is used for triggering control in PWM signal generation to make the ripple regulator system have small ripples and better loop stability simultaneously. The ripple information is used to improve the output offset of the ripple regulator system that is caused by the ripple signal.

Description

technical field [0001] The present invention relates to a ripple regulator, in particular to a control circuit and method of the ripple regulator. Background technique [0002] In a self-clocking DC-to-DC converter with constant on-time (Constant On Time; COT) or hysteretic mode (hysteretic mode), the generation of the PWM signal depends on the ripple on the output voltage Do trigger control. Larger ripple can improve the stability of the loop, but may exceed the specification of the converter. Conversely, smaller ripples may meet specification requirements but may destabilize the loop. Therefore, it is a challenging job to have a small output voltage ripple without losing loop stability. [0003] Such as figure 1 As shown, the traditional COT ripple regulator includes a pair of high-side components Q1 and low-side components Q2 connected between the voltage input terminal Vin and the ground terminal GND through the phase node Phs, and the control circuit 10 provides pul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/14
CPCH02M3/156H02M1/0025H03K7/08G05F1/40
Inventor 陈安东杨智皓
Owner RICHTEK TECH
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