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Converter for adjusting output voltage and related method

A technology of power converters and converters, which is applied in the direction of output power conversion devices, adjustment of electrical variables, control/regulation systems, etc., and can solve the problem that the output voltage cannot be accurately adjusted.

Inactive Publication Date: 2010-05-19
ACTIVE SEMI SHANGHAI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the feedback error signal V ERROR The total parasitic resistance of the current loop caused by the secondary inductor R SEC caused by I SEC .R SEC voltage drop is sensitive
Therefore, the I SEC .R SEC voltage drop is compensated, the output voltage V OUT cannot be fine tuned

Method used

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  • Converter for adjusting output voltage and related method
  • Converter for adjusting output voltage and related method
  • Converter for adjusting output voltage and related method

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Embodiment Construction

[0027] Reference will now be made in detail to certain embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

[0028] figure 2 is a high level schematic diagram of a primary side regulation (PSR) constant current / constant voltage (CC / CV) flyback converter 50 in accordance with one novel aspect. The PSR flyback converter 50 includes a transformer 51 , an external NPN bipolar transistor 52 and a controller integrated circuit (IC) 53 . Transformer 51 includes an N P turns of the primary winding (inductance L P )54, with N S turns of the secondary winding (inductance L S )55, and has NA turns of the auxiliary winding (inductance L A ). The controller IC 53 is a pulse width modulation (PWM) controller with four terminals: terminal VDD for supply voltage, terminal GND for ground, terminal SW for switching and terminal FB for feedback. The initial startup energy for controller IC 53 is provided by resistor 58 and capacitor 59 . ...

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Abstract

The present invention discloses a converter for adjusting output voltage and a related method, which can accurately adjust the output voltage. The method comprises the following steps: (a) through sampling a feedback derivation signal in the switching-off period of a power switch of power converter, generating a plurality of primary voltage samples of the feedback derivation signal, wherein, the feedback derivation signal indicates the output voltage of the power converter; (b) generating at least one voltage sample in the switching-on period of the power switch, wherein, the current detection signal indicates the output inductive current of the power converter, wherein, the current detection signal indicates the output inductive current of the power converter; (c) generating a corrected feedback derivation voltage based on the plurality of primary voltage samples of the feedback derivation signal and at least one voltage sample of the current detection signal; and (d) adjusting the output voltage of the power converter with the corrected feedback derivation voltage.

Description

technical field [0001] The present invention relates to the field of power conversion, and more particularly, to a switch-mode power supply circuit that regulates output current and voltage. Background technique [0002] Switching regulators are voltage regulators included in many switch-mode power supply (SMPS) applications. Typically, switching regulators use power switches, inductors, and diodes to transfer energy from input to output. A pulse width modulated (PWM) digital control signal is used in a switching regulator to generate a regulated output voltage. Among the different types of switching regulators, the flyback converter is a general purpose regulator in which the inductance is divided to form a transformer with the added advantage of isolating the input from the output. [0003] figure 1 (Prior Art) An exemplary conventional primary side regulator (PSR) flyback converter 10 is shown. Converter 10 includes transformer 11 , external NPN bipolar transistor 15 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M2001/0009H02M3/33507H02M1/0009
Inventor 黄树良
Owner ACTIVE SEMI SHANGHAI