Switching mode AC-DC converter and control circuit thereof

A DC converter and converter technology, applied in the direction of converting AC power input to DC power output, high-efficiency power electronic conversion, and output power conversion devices, etc., can solve the problem of high VCC voltage, unacceptable loss of bipolar power switching, etc. question

Inactive Publication Date: 2017-10-20
上海芯熠微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And too large N A / N S It will cause the VCC voltage to become too high under the constant voltage output (5V), and at 85V AC The losses of driving a bipolar power switch become unacceptable

Method used

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  • Switching mode AC-DC converter and control circuit thereof
  • Switching mode AC-DC converter and control circuit thereof
  • Switching mode AC-DC converter and control circuit thereof

Examples

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Embodiment Construction

[0038] Specific examples of the present invention are described in detail below. Examples of embodiments are given in the accompanying drawings. It should be noted that the examples described here are for illustration only and are not intended to limit the present invention. Implementation details are set forth in order to provide a thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these details. In the description of the embodiments, in order to avoid obscuring the present invention, the circuits well known in the art, such as the typical constant voltage module, constant current module and driving module in the primary-side regulated switching power supply controller, are not specifically described.

[0039] Throughout this specification, reference to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with...

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PUM

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Abstract

The invention discloses a primary-side regulation switching mode AC-DC converter and a control circuit thereof. The switching mode AC-DC converter includes an input rectifier, an input capacitor, an output rectifier, an output capacitor, a controller, a controller energy storage capacitor and a controller power supply rectifier; and a transformer composed of a primary side winding, a secondary side winding and an auxiliary winding. The positive plate of the input capacitor, the negative plate of the output capacitor and the positive plate of the energy storage capacitor are coupled to one group of dotted terminals of the primary side winding, the secondary side winding and the auxiliary winding respectively. The negative plate of the input capacitor, the positive plate of the output capacitor and the negative plate of the energy storage capacitor are coupled to the other dotted terminals of the primary side winding, the secondary side winding and the auxiliary winding respectively. The controller includes a voltage opposition circuit, a constant voltage control circuit, a constant current control circuit and a drive circuit. When the secondary side winding performs charge for the output capacitor, the voltage opposition circuit of the controller negates the voltage of the auxiliary winding and outputs to the constant voltage control circuit so as to stabilize the output voltage.

Description

technical field [0001] The present invention relates to switch-mode AC-DC converter technology, in particular, the invention relates to a primary-side regulated switch-mode AC-DC converter and a corresponding control circuit. Background technique [0002] The switching mode AC-DC converter (switching power supply) has the advantages of small size and high conversion efficiency, and its application fields are expanding, including chargers, adapters, etc. For the charger, in the full load range (no load to heavy load), its output exhibits constant voltage and constant current characteristics. [0003] figure 1 Shown is a schematic diagram of a conventional primary side (or primary side) regulated switch mode charger system 100 . The switching power supply charger includes an AC input port (the AC voltage range is generally 85V AC to 265V AC ), bridge rectifier 1 (to convert the AC voltage V AC converted to DC voltage V IN ), input capacitor 2, transformer 3, controller 4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217
CPCH02M7/217H02M1/0032H02M1/0048Y02B70/10
Inventor 朱亚江方邵华
Owner 上海芯熠微电子有限公司
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