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Alternating-current to direct-current converter and control circuit thereof

A technology of a DC converter and a control circuit, which is applied in the direction of irreversible AC power input conversion into DC power output, DC power input conversion into DC power output, control/regulation system, etc. Harmonic and other problems, to achieve the effect of eliminating harmonic noise

Active Publication Date: 2014-06-04
DELTA ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This control signal is a pure DC signal and does not include the full or half-sine wave sampling signal of the input AC voltage Vin (input AC voltage waveform signal V2). Therefore, this control signal can only provide power information, and cannot adjust or eliminate the input current. The purpose of the harmonics of Iin

Method used

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  • Alternating-current to direct-current converter and control circuit thereof
  • Alternating-current to direct-current converter and control circuit thereof
  • Alternating-current to direct-current converter and control circuit thereof

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Embodiment Construction

[0053] Some typical embodiments embodying the features and advantages of the present invention will be described in detail in the description in the following paragraphs. It should be understood that the present invention is capable of various changes in different ways without departing from the scope of the present invention, and that the description and drawings therein are illustrative in nature rather than limiting the present invention.

[0054] figure 2 A circuit block diagram of an AC-DC converter according to a first embodiment of the present invention is shown. exist figure 2 Among them, input current sensor 230, bridge rectifier 204, filter inductor 206, filter capacitor 212, switch circuit 208 (including high voltage side switch 2081 and low voltage side switch 2082), transformer T200, secondary side circuit 210 (including rectifier circuit (D202, D204) and output capacitor (C202, C204)) and load 220, wherein the filter inductor 206 and the filter capacitor 212 ...

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Abstract

The invention discloses a control circuit for an AC-DC converter. The control circuit includes a power control circuit for comparing an input current sensing signal generated by sensing an input current of the AC-DC converter and a power level control input and in response thereto generating a frequency modulation control signal, in which the frequency modulation control signal is used to control the output power of the AC-DC converter and suppress harmonics of the input current, and a square wave generator connected to the power control circuit for generating a driving signal used to drive the switch circuit of the AC-DC converter according to the frequency modulation control signal, in which the frequency of the driving signal is varied with the frequency modulation control signal, thereby suppressing harmonics of the input current and regulating the switching frequency the AC-DC converter, and regulating the output power of the AC-DC converter.

Description

technical field [0001] The present invention relates to a control circuit of an AC-DC converter, in particular to an AC-DC converter that does not require an input voltage detection circuit and a frequency modulation control circuit specially used to eliminate harmonic noise of the input current Control circuit. Background technique [0002] An AC-DC converter (AC-DC converter) is generally used to convert an input AC voltage into an output voltage to drive load elements that require DC voltage operation, such as magnetrons or gas discharge lamps used in microwave ovens. figure 1 A circuit block diagram of a known AC-DC converter is shown. Such as figure 1 As shown, an input AC voltage Vin is provided to the input side of the AC-DC converter. A bridge rectifier 104 , the input side of the bridge rectifier 104 is connected to the input side of the AC-DC converter to rectify the input AC voltage Vin into a full-wave rectified DC voltage. A filter inductor 106 and a filter ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/12H02M3/335H02M1/44
CPCH02M1/425Y02B70/126Y02B70/10
Inventor 邓柏村程光明潘颂熹
Owner DELTA ELECTRONICS INC
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