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A range modulation separation feedback control circuit

A feedback control and amplitude modulation technology, applied in the direction of adjusting electrical variables, control/regulating systems, electrical components, etc., can solve the problems of large feedback signal errors and inability to use optocouplers

Inactive Publication Date: 2007-10-17
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in specific environments (such as photosensitive, radiation environments, etc.), it is often impossible to use optocouplers
However, other methods that directly use the secondary coupling of the converter to obtain feedback have a large error in obtaining the feedback signal

Method used

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  • A range modulation separation feedback control circuit
  • A range modulation separation feedback control circuit
  • A range modulation separation feedback control circuit

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Embodiment Construction

[0010] Below in conjunction with accompanying drawing, the present invention will be further described

[0011] Fig. 1 is a structural block diagram of the amplitude modulation isolation feedback control circuit of the present invention. The feature of the present invention is to realize the function of isolated feedback through AM (amplitude modulation), adopt analog multiplier and full differential structure, and not include optocoupler devices. The invention is suitable for being integrated in switching power supply and its control circuit. The invention mainly includes modules such as square wave processing, differential amplifier, analog multiplier and the like. The square wave processing module shapes the duty ratio change signal output by the external converter into a switch-synchronized square wave. The difference between the input feedback signal and the voltage reference is amplified by the differential amplifier, and the obtained signal is then input into the anal...

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Abstract

The present invention relates to the field of the technology of isolating the feedback circuit using the amplitude modulation. The isolating of the feedback is realized through the amplitude modulation by using an analogue multiplication instrument and a fully differential structure. The present invention includes a square wave processing circuit, a differential amplifier, and an analog multiplier module. The square wave processing circuit rectifying the signal with the dutyfactor changing output by the external convertor, and the difference value between the input feedback signal and the voltage standard is amplified by the differential amplifier and the obtained signals are then input into an analog multiplier to modulate the square wave signals. And the difference of the input feedback signals result in the difference of the amplitude of AM signals, and the isolating is realized by outputting the AM signals to the external convertor and the output of the feedback signals are obtained by using an envelope-demodulation method.

Description

technical field [0001] The invention relates to the technical field of isolated feedback circuits, in particular to an AM (amplitude modulation) isolated feedback circuit that can be integrated in a switching power supply and its control circuit. Background technique [0002] The traditional isolation feedback is mainly obtained by optocoupler. However, optocouplers cannot be used in specific environments (such as photosensitive, radiation environments, etc.). However, in other methods of directly using the secondary coupling of the converter to obtain feedback, the error in obtaining the feedback signal is relatively large. Contents of the invention [0003] Aiming at the above problems, the present invention proposes an isolated feedback circuit through the AM (amplitude modulation) method without using an optocoupler. The circuit uses the switching signal synchronous square wave as the AM carrier, which saves the internal square wave generation circuit and can reduce ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08G05F1/10G05F1/46H03F3/45
Inventor 高峰李春寄刘忠立于芳
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI