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Primary-side regulated pulse width modulation controller with improved load regulation

A controller and primary-side technology, applied in the direction of adjusting electrical variables, control/regulation systems, and conversion equipment with intermediate conversion to AC, etc., can solve the problem that the feedback signal cannot accurately follow the transformer voltage, insufficient load regulation, and weakening of the relationship etc. to achieve the effects of reducing production costs, improving accuracy, and improving voltage regulation

Active Publication Date: 2010-05-05
SYST GEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the feedback signal (Vcc) cannot accurately follow the change of the transformer voltage
Voltage regulation of prior art primary-side power supplies is not stable for all power supply loads
[0004] In addition, high load currents will also make the output rectifier diodes ( figure 1 : The voltage drop on D2) is larger
Although the auxiliary winding voltage and the secondary winding voltage are correlated, the relationship weakens when the power supply load current increases
This leads to further load regulation problems
[0005] Traditional primary-side PWM controllers can reduce production costs, but they have insufficient load regulation

Method used

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  • Primary-side regulated pulse width modulation controller with improved load regulation
  • Primary-side regulated pulse width modulation controller with improved load regulation
  • Primary-side regulated pulse width modulation controller with improved load regulation

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Embodiment Construction

[0020] image 3 A flyback power supply using a primary side regulated PWM controller 101 according to the present invention is shown. V 1 is the flyback voltage of the auxiliary winding of the transformer 400 . V 2 is the flyback voltage of the secondary winding of the transformer 400 . When the PWM controller 101 is running, the auxiliary winding supplies the power supply voltage Vcc through the rectifier diode D1. Auxiliary winding flyback voltage V 1 Can be expressed as:

[0021] V 1 = N A dφ dt - - - ( 1 )

[0022] Among them, N A is the number of turns of the auxiliary winding, and φ is the magnetic flux of the transformer 400 .

[0023] secondary winding flyback voltage V 2 Can be expressed as:

[0024] V 2 = N S ...

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Abstract

The present invention provides a primary-side regulated PWM controller with improved load regulation. In every PWM cycle, a built-in feedback voltage samples and holds a flyback voltage from the auxiliary winding of the transformer via a sampling switch and generates a feedback voltage accordingly. A bias current sink pulls a bias current that is proportional to the feedback voltage. Via a detection resistor, the bias current will produce a voltage drop to compensate the voltage drop of an output rectifying diode as the output load changes. According to the present invention, the bias currentcan enable the PWM controller to regulate the output voltage very precisely without using a secondary feedback circuit.

Description

technical field [0001] The present invention relates to a switching power supply, and more particularly, the present invention relates to a primary-side regulated pulse width modulation (PWM) controller of a switching power supply. Background technique [0002] Usually we use switching power supply (SMPS) as the primary power supply for computers, communication devices and many other products. SMPSs have many advantages in design over other types of power supplies, including more efficient power conversion, smaller size, and lighter weight. However, the high component count in SMPS designs remains a problem for power supply manufacturers and engineers. In order to reduce the production cost of the power supply, some solutions without secondary-side feedback control are provided in the prior art. The applicant of the present invention filed a corresponding patent application in the United States entitled "PWM controller regulating output voltage and output current in primar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28H02M3/335
CPCH02M2001/0006H01F2038/026H02M3/33507H02M1/0006
Inventor 杨大勇陈秋麟林振宇林宋宜
Owner SYST GEN
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