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Peak current control device and method for switching power supply

A technology of peak current control and switching power supply, which is applied in control/regulation systems, output power conversion devices, electrical components, etc., and can solve problems such as reducing control accuracy, affecting control accuracy, and affecting constant primary-side peak current control operations.

Active Publication Date: 2013-01-23
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This affects the constant primary peak current control operation, reducing the expected control accuracy
For example, in the power controller AP3708, the control target is the output current I o proportional to I pk , if I pk With V in and L m change, I o will also vary with V in and L m changes, which affects the control accuracy

Method used

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  • Peak current control device and method for switching power supply
  • Peak current control device and method for switching power supply
  • Peak current control device and method for switching power supply

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Embodiment Construction

[0038] The inventors of the present application have noticed that, referring to the above equation (3), if the V representing the peak current sampling can be limit set to time t onp function, replacing the fixed V in the original method limit , it can be guaranteed that under any condition I pk *R CS Both are expected value K. Thus, according to and equation (3), we get:

[0039] V limit = K t onp t onp + t d - - - ( 4 )

[0040] Figure 4a shows the V obtained according to equation (4) limit with t onp function relationship, specifically showing the V limit relative to t onp An example of a value for . Figure 4a The curve of ...

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PUM

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Abstract

A switching mode power supply with improved peak current control is disclosed. A varying reference signal is adopted to limit the peak current in the energy storage component. The varying reference signal is an exponential function of a time period when a power switch is ON, wherein the power switch is coupled to the energy storage component. The varying reference signal may be generated by a circuit comprising a RC circuit and one or several voltage sources.

Description

technical field [0001] The invention relates to power supply control technology, in particular to a peak current control device and method for a switching power supply. Background technique [0002] For AC / DC conversion in applications such as battery chargers and adapters, a variety of power control schemes have been proposed, which can provide precise constant voltage (CV), constant current (CC) control to obtain the required power supply. For example, BCD semiconductor for Manufacturing Limited proposed a variety of AC / DC power supply controllers, including the primary side control integrated circuit AP3708 (Preliminary Datasheet, Rev.1.0, September 2008, http: / / www.bcdsemi.com ). figure 1 It shows a simplified flyback primary side control switching power supply controlled by AP3708, including power supply controller AP3708, transistor Q1, current detection resistor R CS And the transformer, the transformer consists of primary coil Np, secondary coil Ns and auxiliary c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/12H02M3/335
CPCH02M3/33507H02M2001/0025H02M1/0025
Inventor 王斯然任远程张军明李恩
Owner CHENGDU MONOLITHIC POWER SYST