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Linear predictive sampling circuit and device for measuring transformer degaussing voltage

A linear prediction, sampling circuit technology, applied in the direction of output power conversion devices, instruments, electrical components, etc., can solve the problems of complex detection circuits and increased power supply costs.

Active Publication Date: 2007-03-28
SYST GEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the detection circuit of the aforementioned prior art is too complicated, which increases the cost of the power supply

Method used

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  • Linear predictive sampling circuit and device for measuring transformer degaussing voltage
  • Linear predictive sampling circuit and device for measuring transformer degaussing voltage
  • Linear predictive sampling circuit and device for measuring transformer degaussing voltage

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Embodiment Construction

[0013] Fig. 1 shows a switching power converter according to a preferred embodiment of the present invention, which comprises a transformer 10 having an auxiliary winding N AUX , main winding N PRI and secondary winding N SEC . main winding N PRI coupled to the input voltage V IN . Secondary winding N SEC via rectifier 40 and capacitor 45 to generate an output voltage V O . In order to regulate the output voltage V O , the switching control circuit 50 generates the switching signal S W In order to switch the transformer 10 via the transistor 20 . When transistor 20 is turned on, it is equivalent to the input voltage V IN The magnetizing voltage is applied to the transformer 10. Therefore, the charging current flows through the main winding N of the transformer 10 PRI and transistor 20. Through resistive device 25 , the charging current is converted into a current signal coupled to the VI terminal of switching control circuit 50 . Once the switch 20 is turned off,...

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Abstract

It produces a feedback signal via testing the demagnetize voltage of transformer. Via the feedback signal, a switch signal is produced to regulate the output of the power converter. A signal generating circuit produces a sampling signal according to the1st, 2nt signals and the switch signal. The 1st signal relates to the magnetize voltage of the transformer while the 2nd to the demagnetize one. The sampling and holding circuit is coupled to the transformer. According to the sampling signal, it samples against the transformer demagnetize voltage to produce the feedback signal. The feedback signal relates to the output voltage of the power converter.

Description

technical field [0001] The present invention relates to a power converter, and more particularly, to a control circuit for switching a power converter. Background technique [0002] Power supplies have been widely used to provide regulated and stable output voltages. For safety reasons, an off-line power supply must provide isolation between its primary and secondary sides. An optocoupler and a secondary regulator are required to regulate the output voltage of an offline power supply. In order to reduce the number of components and the secondary side feedback circuit, the degaussing voltage of the transformer has been used to adjust the output voltage of the power supply, such as Randolph D.W.Shelly in the US patent 4,302,803 "Rectifier-converter power supply with multi-channel flyback inverter (with multi-channel flyback inverter Transformer to rectifier converter power supply)" described. However, the aforementioned prior art techniques cannot measure an accurate voltag...

Claims

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Application Information

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IPC IPC(8): H02M3/24H02M1/00
Inventor 杨大勇
Owner SYST GEN