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Controlled self-oscillation modulator and pwoer conversion system for using same

A modulator and self-oscillating technology, which is applied in the direction of control/regulation system, adjustment of electric variable, output power conversion device, etc.

Inactive Publication Date: 2004-01-28
邦及奥卢夫森冰能公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In short, although the COM approach overcomes some of the shortcomings of conventional PWM techniques, it can be said that there are limitations

Method used

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  • Controlled self-oscillation modulator and pwoer conversion system for using same
  • Controlled self-oscillation modulator and pwoer conversion system for using same
  • Controlled self-oscillation modulator and pwoer conversion system for using same

Examples

Experimental program
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Embodiment Construction

[0031] The general block diagram of Fig. 1 shows the basic principles of COM according to the prior art. Since it uses voltage feedback, it is called VCOM. The input voltage Vi is supplied to the feedforward block 2, which is also powered by the feedback block 1, to obtain and process error information. The compensation signal Vb is supplied to a hysteresis-free comparator 3, which is referenced to the voltage V DC , preferably a DC voltage. The obtained pulse modulation signal is the power supplied by Vs amplified in the switching power conversion stage 4 to generate a power pulse signal Vp, and the pulse signal drives the inductive load 5 .

[0032] Box 1 processes the output information from the output voltage Vp and controls the overall transfer function characteristics of the system. A controlled oscillating modulator is characterized by at least two poles in boxes 1 and 2, which in combination with the propagation delay of the modulator and power stage produces a sine...

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PUM

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Abstract

A controlled oscillation modulator includes a comparator and a power amplification stage for pulse modulation, and a higher order oscillating loop comprising first feedback means (21) and first forward means (22) securing stable oscillating conditions. The modulator is characterized by current measurement means, arranged to measure a value (iL) of a current supplied by said power amplification stage to a load (5) connected to the modulator, said measured value being supplied to said first feedback means (21) has a transfer function adapted to generate said first feedback signal based on said measured value (iL), and said first forward means (21) has a transfer function adapted to generate said modulating signal based on said first feedback means and an input signal. Application are general DC-DC and DC-AC power conversion with inductive loading. In a preferred emplements a precision transconductance amplifier by a current feedback. In a futher preferred embodiment the controlled oscillation modulator implements a precision voltage power amplifier for audio amplification purposes.

Description

technical field [0001] The present invention relates to a self-oscillating modulator comprising a comparator and a pulse modulation power amplification stage, and a high-order oscillation loop comprising a first feedback device and a first feed-forward device to ensure a stable An oscillating condition, wherein said first feedback means is arranged to provide a first feedback signal to said first feedforward means, said first feedforward means being arranged to provide a modulating signal to said comparator. [0002] The invention also relates to a switching power conversion system using such a modulator, such as a DC-AC (eg audio amplification), DC-DC or AC-AC conversion system. The present invention can advantageously be used to improve electrical energy conversion in any system, especially for high-efficiency audio amplification in precision DC-AC conversion systems. Background technique [0003] The pulse modulator is a central element of any power conversion system. M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/10H02M3/00H03F3/217
CPCH03F3/217
Inventor 卡斯滕·尼尔森
Owner 邦及奥卢夫森冰能公司