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Comparator offset voltage compensation circuit, compensation method and zero-crossing detection circuit

A technology of offset voltage and compensation circuit, which is applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc. It can solve the problems of inaccurate calibration of offset voltage and long calibration time, and achieve the effect of low calibration time and high calibration accuracy

Pending Publication Date: 2020-07-17
JOULWATT TECH INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a comparator offset voltage compensation circuit, compensation method and zero-crossing detection circuit, which are used to solve the problems of inaccurate offset voltage correction and long calibration time in the prior art

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  • Comparator offset voltage compensation circuit, compensation method and zero-crossing detection circuit
  • Comparator offset voltage compensation circuit, compensation method and zero-crossing detection circuit

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Embodiment Construction

[0015] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made within the spirit and scope of the present invention.

[0016] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0017] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in a relatively simplified form and use inaccurate scales to facilitate and clearly assist the purpose of illustrating the embodiments of the prese...

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Abstract

The invention provides a comparator offset voltage compensation circuit, a compensation method and a zero-crossing detection circuit. The compensation circuit is a digital circuit and is used for compensating offset voltage of the main comparator, the main comparator compares a first signal with a second signal, the compensation circuit comprises an auxiliary comparator, and the auxiliary comparator compares a third signal with the second signal and outputs a discrimination signal; the third signal is equal to the first signal, or the third signal is in positive correlation with the first signal; and the discrimination signal controls the compensation amount of the offset voltage of the main comparator. The comparator offset voltage calibration precision is high, and the calibration time is short.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a comparator offset voltage compensation circuit, a compensation method and a zero-crossing detection circuit. Background technique [0002] A comparator is a common module in analog integrated circuits and is widely used in switching power supply control circuits. The performance of the comparator greatly affects the performance of the system, but the performance of the comparator is severely restricted by its offset voltage. Especially with the gradual reduction of the feature size of the CMOS process, the offset caused by the mismatch of the threshold voltage, the area factor and the parasitic capacitance gradually increases. [0003] Traditional offset voltage cancellation techniques, such as input offset storage (IOS) and output offset storage (OOS), use two-phase non-overlapping clocks and storage capacitors to eliminate offsets, which will introduce additional capacitance ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 孟宪志
Owner JOULWATT TECH INC LTD