Multi-input comparator and power switching circuit

A comparator, multi-input technology, applied in the field of circuits, can solve the problem of operational amplifier response speed limitation and complexity, and achieve the effect of simplifying circuit design

Active Publication Date: 2010-09-29
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Again, this design is complex and limited by the speed of response of the op amp

Method used

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  • Multi-input comparator and power switching circuit
  • Multi-input comparator and power switching circuit
  • Multi-input comparator and power switching circuit

Examples

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Embodiment Construction

[0047] The detailed description of the present invention directly or indirectly simulates the operation of the technical solution of the present invention mainly through programs, steps, logic blocks, processes or other symbolic descriptions. In the ensuing description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. Rather, the invention may be practiced without these specific details. These descriptions and representations herein are used by those skilled in the art to effectively convey the substance of their work to others skilled in the art. In other words, for the purpose of avoiding obscuring the present invention, well-known methods, procedures, components and circuits have not been described in detail since they are readily understood.

[0048] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementa...

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Abstract

The invention provides a multi-input comparator comprising a first differential transistor, a second differential transistor, a first resistor and a second resistor, wherein the grid electrode of the first differential transistor is used as the first voltage input end of the multi-input comparator; the first voltage input end receives first voltage; the second differential transistor forming a differential transistor pair with the first differential transistor; the grid electrode of the second differential transistor is used as the second voltage input end of the multi-input comparator; the second voltage input end receives second voltage; one end of the first resistor is connected with the source electrode of the first differential transistor; one end of the second resistor is connected with the source electrode of the second differential transistor; the other end of the first resistor is connected with the other end of the second resistor, wherein a connected node of the first resistor and the first differential transistor is used as the current input end of the multi-input comparator and the current input end is connected with an injection current source; or the connected node of the second resistor and the second differential transistor is used as the current input end of the multi-input comparator, and the current input end is connected with an extraction current source.

Description

【Technical field】 [0001] The invention relates to the field of circuits, in particular to a multi-input comparator and a power conversion circuit. 【Background technique】 [0002] In the prior art, a pulse width modulation comparator (PWMComparator) is usually used in the pulse width modulation system. figure 1 It is a schematic diagram of the comparison principle of the PWM comparator, where EAO is the error amplification signal output by the error amplifier (Error Amplifier), and Ramp is the sawtooth or triangular wave signal. Please see figure 1 As shown, the PWM comparator is used to compare the error amplification signal EAO and the triangular wave signal Ramp to generate and output the pulse width modulation signal PWMO. When the error amplification signal EAO is greater than the triangular wave signal Ramp signal, the pulse width modulation signal PWMO is at a high level; when the error amplification signal EAO is smaller than the triangular wave signal Ramp signal, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K3/023H02M3/135
CPCH03K7/08H03K5/2481H02M3/156
Inventor 王钊董贤辉杨晓东
Owner WUXI ZGMICRO ELECTRONICS CO LTD
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