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Output power supervisory circuit and control circuit for AC/DC converting circuit

A technology for converting circuits and output power, which is applied in the field of output power monitoring circuits and control circuits, can solve problems such as structural complexity and unsatisfactory costs, and achieve the effects of facilitating automated production, reducing the total number of components, and improving reliability

Active Publication Date: 2009-06-24
上海得倍电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This kind of AC / DC power conversion circuit commonly used at present needs to sample the voltage and current signals at the output terminal, and then feed them back through the photocoupler, so the structure is complicated Unsatisfactory in terms of degree and cost

Method used

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  • Output power supervisory circuit and control circuit for AC/DC converting circuit
  • Output power supervisory circuit and control circuit for AC/DC converting circuit
  • Output power supervisory circuit and control circuit for AC/DC converting circuit

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Embodiment Construction

[0024] refer to image 3 As shown, the output power monitoring circuit of the present invention is suitable for image 3 The shown AC / DC conversion circuit for source feedback can be obtained from image 3 Point A in the feedback voltage signal V FB to monitor output power changes.

[0025] First refer to Figure 4 Illustrate the power control objective of the present invention, Figure 4 yes image 3 The relationship curve between the output terminal voltage Vo and the current Io. The voltage Vo is approximately a constant DC voltage. As the input power increases, the output power Po=Vo*Io increases accordingly. Since Vo is approximately constant, Io increases. A means is needed to detect the moment when Io reaches a set critical value Ioset, and take corresponding control measures to at least reduce the current Io.

[0026] Based on such a goal, the output power monitoring circuit and control circuit of the present invention are designed.

[0027] Such as Figure 5 ...

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Abstract

The invention relates to an output power monitoring circuit and a power control circuit of an AC / DC conversion circuit; the monitoring circuit comprises a first multiplier, a second multiplier and a power comparator; wherein, the first multiplier calculates a reference power signal according to a feedback voltage signal and a preset output current signal; wherein, the feedback voltage is in direct proportion to the output voltage of the AC / DC conversion circuit; and the reference power is in direct proportion to the set output power of the AC / DC conversion circuit; the second multiplier calculates an actual power signal according to an input voltage signal and an input current signal; wherein, the actual power is in direct proportion to the actual output power of the AC / DC conversion circuit; the power comparator is connected with the first multiplier and the second multiplier and compares the actual power signal with the reference power signal, and outputs a power adjustment signal according to comparison result.

Description

technical field [0001] The invention relates to an AC / DC conversion circuit, in particular to an output power monitoring circuit and a control circuit of the AC / DC conversion circuit. Background technique [0002] AC / DC power converters are widely used in various DC chargers, power adapters, and offline power supplies. Generally speaking, an AC / DC power converter converts a large AC signal such as mains power into a small DC signal suitable for use by small electronic devices such as mobile phones. Fig. 1 is a commonly used AC / DC conversion circuit 10 at present. In this circuit, the AC signal AC is coupled to the DC output terminal DC by a transformer 11 after being rectified and filtered, and a voltage stabilizing chip 12 and The output current limiting loop 13 is sampled at the output terminal, and then fed back to the voltage V of the primary PWM (pulse width modulation) chip 15 of the transformer through the photocoupler 14 FB To achieve output voltage and power contr...

Claims

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Application Information

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IPC IPC(8): H02M7/12H02M3/28
Inventor 乔红瑗杨晓鹏姜亮亮丁佳卿曾晓
Owner 上海得倍电子技术有限公司
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