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System and method for adjusting output current of power conversion system

A current and converter technology, applied in the field of integrated circuits

Active Publication Date: 2016-03-09
ON BRIGHT ELECTRONICS SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But system 100 usually cannot meet all these needs

Method used

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  • System and method for adjusting output current of power conversion system
  • System and method for adjusting output current of power conversion system
  • System and method for adjusting output current of power conversion system

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Embodiment Construction

[0033] Certain embodiments of the invention are directed to integrated circuits. More specifically, some embodiments of the invention provide systems and methods for regulating output current. Merely by way of example, some embodiments of the invention are applied to power conversion systems. It should be understood, however, that the present invention has broader applicability.

[0034] refer to figure 1 , to achieve high efficiency (eg, >90%), as an example, the system 100 may operate in a quasi-resonant (QR) mode. The peak value of current 198 is determined as follows:

[0035] I i n _ p e a k = ( T o n L p ) × ...

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PUM

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Abstract

The invention provides a system and a method for adjusting the output current of a power conversion system. In an example, a system controller comprises a driver which is configured to output a driving signal to a switch to influence the current flowing through an inductive winding of a power converter, and the driving signal is associated with a switching cycle including a switched-on time period and a switched-off time period. In the switched-on time period, the switch is closed or switched on in response to the driving signal. In the switched-off time period, the switch is disconnected or switched off in response to the driving signal. The duty ratio is equal to the result of dividing the duration of the switched-on time period by the duration of the switching cycle, and the duty ratio is smaller than 1. A parameter is equal to 1 minus the duty ratio. The system controller is configured to keep the product of the duty ratio, the parameter and the duration of the switched-on time period approximately constant.

Description

technical field [0001] Certain embodiments of the invention relate to integrated circuits. More specifically, some embodiments of the invention provide systems and methods for regulating output current. Merely by way of example, some embodiments of the invention are applied to power conversion systems. However, it will be appreciated that the invention has broader applicability. Background technique [0002] Light emitting diodes (LEDs) are widely used in lighting applications. Typically, an approximately constant current is used to control the operating current of the LED to achieve constant brightness. figure 1 is a simplified diagram showing a conventional LED lighting system. LED lighting system 100 includes controller 102, resistors 108, 116, 122, 124, and 128, capacitors 106, 110, 112, and 130, full wave rectification assembly 104, diodes 114 and 118, inductive assembly 126 (e.g., an inductor) , and Zener diode 120. Controller 102 includes terminals (eg, pins) 13...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08
CPCH02M1/082
Inventor 方倩兰聪方烈义
Owner ON BRIGHT ELECTRONICS SHANGHAI