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Method and circuit arrangement for optimising maximum current limitation in the primary switch of a switched-mode power supply, and a power supply

A primary current and circuit device technology, which is applied in the direction of output power conversion devices, electrical components, and adjustment of electrical variables, and can solve the problem of sensitivity to the maximum primary current limit function

Active Publication Date: 2010-05-26
SALCOMP OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A further idea proposed in US 6,608,769 is to have a coupling 204 from the input voltage to point 202 in order to prepare higher input voltages to draw the potential of higher point 202 and thus make the maximum primary current limit function sensitive

Method used

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  • Method and circuit arrangement for optimising maximum current limitation in the primary switch of a switched-mode power supply, and a power supply
  • Method and circuit arrangement for optimising maximum current limitation in the primary switch of a switched-mode power supply, and a power supply
  • Method and circuit arrangement for optimising maximum current limitation in the primary switch of a switched-mode power supply, and a power supply

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Embodiment Construction

[0027] image 3 Embodiments of the present invention are shown on a very suggestive, abstract level in a manner similar to the graphical representation in FIG. 2 . On the primary side of the switched mode power supply there is a primary switch 104 , a primary coil 105 , a pulse forming circuit 108 and a current measuring resistor 109 . Similar to FIG. 2, as the pulse forming circuit (the pulse forming circuit must also obviously include other parts here, however, these other parts are not shown in the image 3As part of shown in ), there is a disconnect switch 201. Arrow 203 again indicates the effect of maximum primary current limitation, according to which the increasing voltage drop across the sense resistor raises the potential at point 202 until the potential at point 202 is finally sufficient to turn on disconnect switch 201 . However, in parallel with the conventional current sense resistor 109 is a series connection of another resistor 301 and switch 302 . As schemati...

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Abstract

A power supply converts an input voltage to an output voltage. A primary current path comprises a primary coil, a primary switch and a resistive path portion. A pulse forming circuit is adapted to deliver switching pulses to said primary switch. As a part of the pulse forming circuit there is a cut-off switch adapted to end a switching pulse as a response to a voltage drop over said resistive pathportion reaching a threshold value. An electrically controllable resistance constitutes a part of said resistive path portion and is responsive by its resistance value to a value of an input voltagecoupled to the power supply.

Description

technical field [0001] The present invention generally relates to circuit topologies of switched mode power supplies. The invention relates in particular to a circuit arrangement used to limit the maximum current that can flow through a primary switch, which is the switching component that chops the current flowing through the primary coil of a transformer in a switched-mode power supply. Background technique [0002] Figure 1 is a schematic diagram of certain known features commonly found on the primary side of a switch mode power supply. In FIG. 1 , a switched-mode power supply 100 includes a primary side 101 and a secondary side 102 separated from each other by a transformer 103 . The switch 104 on the primary side repeatedly switches the current flowing through the primary coil 105 , which causes energy to be stored into the magnetic field of the transformer 103 . A diode 106 on the secondary side only allows current to flow through the secondary coil 107 in one direct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32H02M3/338H02M1/00
CPCH02M2001/0009H02M2001/0025H02M3/3385H02M1/32H02M1/0025H02M1/0009
Inventor J·明基南
Owner SALCOMP OYJ