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Control method and controller for AC-DC converter

An AC-DC, control method technology, applied in the control/regulation system, the conversion of DC power input to DC power output, the conversion of irreversible AC power input to DC power output, etc., can solve problems such as inability to compensate, and achieve guaranteed accuracy , the effect of saving area and reducing the difficulty of design

Active Publication Date: 2014-07-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This error varies with the load conditions of the system and the parameters of off-chip devices, and cannot be compensated on-chip.

Method used

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  • Control method and controller for AC-DC converter
  • Control method and controller for AC-DC converter
  • Control method and controller for AC-DC converter

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Embodiment Construction

[0036] In order to describe the present invention more specifically, the control method and its controller of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] image 3 Shown the structure of AC-DC converter and its controller of the present invention, AC-DC converter is made up of half-wave rectifier BR, transformer T, switching tube Q, diode D and electric capacity C; Wherein, the positive of half-wave rectifier BR The negative input terminal is connected to the alternating voltage AC, and the positive output terminal is connected to the primary winding N of the transformer T p The terminal of the same name is connected, and the negative output terminal is grounded; the primary winding of the transformer T is N p The non-identical end of the switch tube Q is connected to the drain, the source of the switch tube Q is grounded, the gate of the switch tube Q receives the PWM signal provided ...

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PUM

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Abstract

The invention discloses a control method for an alternating current to a direct current (AC-DC) converter. The auxiliary winding voltage signal of the AC-DC converter is collected, and a feedback quantity is automatically compensated by a high-precision primary feedback technology to obtain a precise feedback quantity, so that a pulse-width modulation (PWM) signal is formed to drive a switch tube in the AC-DC converter to finally achieve the aim of controlling and regulating the output voltage of the converter; and therefore, the precision of the feedback quantity calculated by the method ensures the precision of the output voltage of the AC-DC converter. The invention further discloses a controller for the AC-DC converter. The controller comprises a primary sampling circuit and a digital compensator, wherein the primary sampling circuit comprises a waveform real-time analyzing module, a single-input double-output digital-to-analog converter and two comparators. According to the controller, a relatively precise feedback quantity can be obtained; and the digital-to-analog converter rather than an analog-to-digital converter is adopted so as to reduce the design difficulty and save the consumed area.

Description

technical field [0001] The invention belongs to the technical field of voltage converter control, and in particular relates to a control method of an AC-DC (alternating current-direct current) converter and a controller thereof. Background technique [0002] With the development of battery chargers, LED drive circuits, etc., the design technology chips of AC-DC converters have also been developed rapidly. The requirements for the integration of the AC-DC converter chip are gradually increasing, and the designer is required to use as few off-chip devices as possible to reduce the hardware overhead and the overall volume of the converter. [0003] figure 1 It is a traditional AC-DC converter based on secondary side feedback. As shown in the figure, the chip adopts the optocoupler isolation feedback mode. The output voltage on the load resistor is transmitted to the primary side of the transformer as the feedback voltage through the optocoupler, and the output voltage is adju...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/12H02M3/335
Inventor 何乐年刘侃邱建平
Owner ZHEJIANG UNIV