Transconductance adjustment circuit, transconductance type error amplification unit and switching type power converter

An error amplifier and power converter technology, which is applied to amplifiers with semiconductor devices/discharge tubes, amplifiers, and electrical variable adjustment directions, which can solve problems such as bandwidth reduction and achieve the effect of bandwidth stability.

Active Publication Date: 2014-10-08
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of the reference signal setting, if the expected value of the output voltage increases, the voltage division coefficient needs to be reduced accordingly, resulting in a decrease in the bandwidth
However, in practical applications, it is not expected that the bandwidth will decrease as the expected value of the output voltage increases.

Method used

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  • Transconductance adjustment circuit, transconductance type error amplification unit and switching type power converter
  • Transconductance adjustment circuit, transconductance type error amplification unit and switching type power converter
  • Transconductance adjustment circuit, transconductance type error amplification unit and switching type power converter

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Embodiment Construction

[0020] Some embodiments of the present disclosure will be described in detail below. In the following description, some specific details, such as specific circuit structures in the embodiments and specific parameters of these circuit elements, are used to provide a better understanding of the embodiments of the present disclosure. It will be understood by those skilled in the art that the embodiments of the present disclosure may be practiced even without some details or other combinations of methods, elements, materials, and the like.

[0021] In the description of the present disclosure, when referring to "an embodiment" it means that the specific features, structures or parameters, steps, etc. described in the embodiment are included in at least one embodiment according to the present disclosure. Therefore, in the description of the present disclosure, if terms such as "according to an embodiment of the present disclosure" and "in an embodiment" are used, they are not used ...

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Abstract

Disclosed are a transconductance adjustment circuit, a transconductance type error amplification unit and a switching type power converter. The transconductance adjustment circuit is at least partially based on the output voltage of the switching type power converter to generate a bias current directly proportional to the output voltage, the bias current is provided for a transconductance type error amplifier in the transconductance type error amplification unit, and therefore transconductance of the transconductance type error amplifier is directly proportional to the output voltage. A negative feedback loop is adopted by the switching type power converter to adjust the output voltage of the power converter, the transconductance adjustment circuit and the transconductance type error amplification unit enable the bandwidth of the negative feedback loop to be basically stable, and the bandwidth is not affected by changes of the expected value of the output voltage.

Description

technical field [0001] Embodiments of the present disclosure relate to switch-type power converters, and in particular to error amplification units in switch-type power converters. Background technique [0002] The switching power converter converts the input voltage into a suitable and stable output voltage for the load by controlling the periodic on and off switching of the switching unit. [0003] Usually, the control circuit in the switching power converter controls the on and off switching of the switching unit based on the feedback signal reflecting its output voltage and the reference signal representing its expected output voltage, so as to adjust the output voltage in time according to the load change. This creates a negative feedback loop. The reference signal is provided by a reference circuit inside the switch-type power converter, so it is preset. The feedback signal can generally be provided by dividing the output voltage through a feedback circuit coupled to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/088H02M3/155
CPCG05F3/267H02M3/158H03F1/34H03F3/2171H03F3/4508H03F2200/351H03F2200/45H03F2203/45112H03F2203/45116H03F2203/45676H02M1/0003
Inventor 李磊
Owner CHENGDU MONOLITHIC POWER SYST
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