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

A DC converter and control circuit technology, applied in the direction of irreversible AC power input conversion to DC power output, DC power input conversion to DC power output, control/regulation system, etc., can solve the problem that the input current Iin cannot be adjusted or eliminated Harmonic and other problems, to achieve the effect of eliminating harmonic noise

Active Publication Date: 2012-02-01
DELTA ELECTRONICS INC
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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 following description. It should be understood that the present invention can have various changes in different ways, which do not depart from the scope of the present invention, and the descriptions and drawings therein are essentially for illustrative purposes 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. in figure 2 Among them, the input current sensor 230, the bridge rectifier 204, the filter inductor 206, the filter capacitor 212, the switch circuit 208 (including the high-side switch 2081 and the low-side switch 2082), the transformer T200, the secondary side circuit 210 (including the rectifier circuit (D202, D204) and output capacitors (C202, C204)) and load 220, wherein the filter inductor 206 and the filter capaci...

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Abstract

The invention provides an alternating-current to direct-current converter and a control circuit thereof. The control circuit comprises a power control circuit and a square wave generator, wherein the power control circuit is used for comparing an input current sensing signal generated by one input current of the alternating-current to direct-current converter with a frequency modulation control signal generated by a power level control input, and the frequency modulation control signal is also used for the output power control of the alternating-current to direct-current converter and the harmonic control of the input current; and the square wave generator is connected to the power control circuit and generates a driving signal for driving the switching circuit of the alternating-current to direct-current converter according to the frequency modulation control signal, the frequency of the driving signal changes with the frequency modulation control signal, therefore the harmonic noise of the input current of the alternating-current to direct-current converter is eliminated, the switching frequency of a switch is adjusted and the output power of the alternating-current to direct-current converter is adjusted at the same time.

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 the harmonic noise of the input current Control circuit. Background technique [0002] An AC-DC converter is generally used to convert an input AC voltage into an output voltage to drive load components that require DC voltage operation, such as a magnetron or gas discharge lamp used in a microwave oven. figure 1 The 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 capacitor 112 are...

Claims

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Application Information

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IPC IPC(8): H02M7/12H02M3/335H02M1/44
CPCY02B70/126H02M1/425Y02B70/10
Inventor 邓柏村程光明潘颂熹
Owner DELTA ELECTRONICS INC
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