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Controller of power converter with adjustable jitter amplitude and related method

A power converter and controller technology, applied in the direction of conversion equipment with intermediate conversion to AC, can solve the problem of insignificant improvement of electromagnetic interference, and achieve the effect of reducing peak energy

Active Publication Date: 2017-05-03
LEADTREND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the quasi-resonant mode PWM (Quasi resonant mode PWM) architecture, the quasi-resonant mode PWM architecture can naturally jump between the first valley and the second valley, resulting in a phenomenon similar to jitter, but this phenomenon does not affect the electromagnetic interference The improvement is not significant

Method used

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  • Controller of power converter with adjustable jitter amplitude and related method
  • Controller of power converter with adjustable jitter amplitude and related method
  • Controller of power converter with adjustable jitter amplitude and related method

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Embodiment Construction

[0053] Please refer to figure 1 , figure 1 It is a schematic diagram illustrating a controller 100 of a power converter with adjustable jitter amplitude according to an embodiment of the present invention. Such as figure 1 As shown, the controller 100 includes a feedback pin 102 , a logic circuit 104 , an auxiliary pin 106 and a current detection pin 108 . The feedback pin 102 is used to receive a feedback voltage VFB from the secondary side SEC of the power converter, wherein the feedback voltage VFB is related to the output voltage VOUT of the secondary side SEC of the power converter, and is a DC voltage The logic circuit 104 is used to generate a jitter signal JS according to a frequency CLK, the feedback voltage VFB and a first resistor R1, wherein the frequency CLK is the internal frequency of the controller 100; the auxiliary pin 106 is used to receive an active Regarding a voltage VD of an auxiliary winding AUX of the power converter, the voltage VD is generated by ...

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PUM

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Abstract

The invention discloses a controller for a power converter capable of adjusting jittering amplitude, and a correlation method thereof. The controller comprises a feedback pin, a first logic unit, a logic circuit, an auxiliary pin and a current detection pin. The feedback pin receives feedback voltage from the secondary side of the power converter; the logic circuit generates jittering signals according to frequency, feedback voltages and first resistance; the auxiliary pin receives voltages of an auxiliary winding of the power converter; and the current detection pin generates detection voltages according to currents flowing through the primary side of the power converter; the voltages, the jittering signals and the detection voltages, determining the starting time of the primary side of the power converter, such that in a quasi-resonance mode pulse width modulation architecture, jittering can be performed on the main switch frequency and secondary higher harmonic waves of a powers witch on a frequency spectrum so as to carry out energy diffusion and reduce the peak value energy of electromagnetic interference.

Description

technical field [0001] The present invention relates to a controller of a power converter with adjustable jitter amplitude and a method for the controller of the power converter to generate adjustable jitter amplitude, especially a method for using the logic circuit in the controller to jitter from the power converter. The feedback voltage of the secondary side or the current flowing through the primary side of the voltage power converter are used to adjust the controller of the power converter for turning on time and the method for generating adjustable jitter amplitude. Background technique [0002] Switching power supply (switching power supply) is already a power supply used in most consumer electronic devices. It controls the energy storage and release in the inductor through the switching of a power switch to provide power that meets the specification requirements. . If the switching of the power switch is always maintained at a specific frequency, it is easy to radia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28
CPCH02M3/28
Inventor 邹明璋黄俊胜黄国建陈仁义
Owner LEADTREND TECH
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