Three-pin package constant current and voltage controller in critical conduction mode

A technology of controllers and inductors, applied in control/regulation systems, high-efficiency power electronic conversion, instruments, etc., can solve problems such as poor accuracy of output voltage and output current

Active Publication Date: 2010-02-24
ACTIVE SEMI SHANGHAI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of the flyback converter 21 is the poor accuracy of the output voltage and output current

Method used

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  • Three-pin package constant current and voltage controller in critical conduction mode
  • Three-pin package constant current and voltage controller in critical conduction mode
  • Three-pin package constant current and voltage controller in critical conduction mode

Examples

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Embodiment Construction

[0040] Reference will now be made in detail to certain embodiments of the invention, examples of which are illustrated in the accompanying drawings.

[0041] image 3 is a diagram of a flyback converter 35 having a controller integrated circuit (IC) 36 packaged in an integrated circuit package 37 . Although the term "integrated circuit" is often used to refer to both an integrated circuit and an integrated circuit package in which an integrated circuit is housed, the term "integrated circuit" is used herein to refer only to an integrated circuit die. The flyback converter 35 includes a transformer 38 for converting the input voltage to a different output voltage. The transformer 38 includes a primary inductor (winding) 39 , a secondary inductor 40 and an auxiliary inductor 41 . Primary inductor 39 has N P turns; the secondary inductor 40 has N S turns; and the auxiliary inductor 41 has N A turn.

[0042] In one embodiment, the input voltage is the voltage from a wall out...

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PUM

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Abstract

This invention discloses a three-pin package constant current and voltage controller in critical conduction mode, which has less exterior elements, can work in critical conduction mode, can accuratelycontrol constant output current and voltage and can be applied to a self-oscillation inverse converter. The constant current and voltage controller comprises a switch control terminal which is coupled to an inductor switch. The inductor switch is switched off by an inductor switch signal having a connecting time. A controller integrated circuit arranged in an integrated circuit encapsulation adjusts the connecting time in a constant current mode to keep the constant output current of the inverse converter and adjusts the connecting time in a constant voltage mode to keep the constant output voltage of the inverse converter. The constant current and voltage controller further comprises a feedback terminal through which the controller integrated circuit receives electric power and a grounding terminal through which the controller integrated circuit is grounded.

Description

technical field [0001] The present invention relates to the field of power conversion, and more particularly to a controller that regulates on the primary side, using only three pins to generate a constant output current and a constant output voltage. Background technique [0002] Flyback converters are used as battery chargers and AC adapters to provide constant current to heavy loads and constant voltage to light loads (such as when the battery is fully charged). A flyback converter can operate in discontinuous conduction mode (DCM), critical conduction mode (CRM) or continuous conduction mode (CCM). In discontinuous conduction mode, there is a time gap after all the energy delivered to the secondary inductor has been discharged before the current starts ramping up through the primary inductor again. In continuous conduction mode, the current begins to ramp up in the primary inductor before the current has stopped flowing through the secondary inductor to discharge the tr...

Claims

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Application Information

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IPC IPC(8): H02M7/217H02M3/156
CPCY02B70/16H02M2001/0032H02M3/335H02M1/0032Y02B70/10
Inventor 黄树良羊建陈明亮
Owner ACTIVE SEMI SHANGHAI
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