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Power path switching circuit

A technology of power supply path and switching circuit, which is applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of high cost, and achieve the effect of reducing size and wiring area

Inactive Publication Date: 2022-03-08
RICHTEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Resistor Rcs needs to use high-accuracy resistors for sensing current, so it is expensive and requires additional PCB space to accommodate resistor Rcs

Method used

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Embodiment Construction

[0047] The drawings in the present invention are all schematic diagrams, mainly intended to show the coupling relationship between various circuits and the relationship between various signal waveforms. As for the circuits, signal waveforms and frequencies, they are not drawn to scale.

[0048] figure 2 is a schematic diagram showing a power path switch circuit according to an embodiment of the present invention. The power path switch circuit 20 of the present invention can be applied to any type of power path 203 . like figure 2 As shown, the power path switch circuit 20 includes a power transistor unit 201 and a voltage locking circuit 202 . The power transistor unit 201 is coupled between a supply terminal IN and an output terminal OUT of the power path 203 .

[0049] The power transistor unit 201 includes a first vertical double-diffused metal oxide semiconductor (VDMOS) device 2011 and a second VDMOS device 2012 . The first VDMOS device 2011 has a first current infl...

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Abstract

A power path switching circuit includes: a power transistor cell including a first vertical double-diffused metal oxide semiconductor element having a first current outflow terminal coupled to an output terminal of a power path and a second vertical double-diffused metal oxide semiconductor element having a second current outflow terminal coupled to an output terminal of the power path; a first current inflow end of the first vertical double-diffused metal oxide semiconductor element and a second current inflow end of the second vertical double-diffused metal oxide semiconductor element are coupled to a supply end of the power supply path; the voltage locking circuit is respectively coupled with the first current flowing-out end and the second current flowing-out end so as to lock the voltage of the second current flowing-out end to the voltage of the first current flowing-out end; therefore, a first conduction current flowing through the first vertical double-diffused metal oxide semiconductor element and a second conduction current flowing through the second vertical double-diffused metal oxide semiconductor element have a preset proportion.

Description

technical field [0001] The present invention relates to a power path switch circuit, and more particularly to a power path switch circuit capable of reducing the wiring area of ​​a printed circuit board. Background technique [0002] figure 1 is a secondary side circuit showing a known flyback power supply circuit. like figure 1 As shown, the secondary side circuit of the known flyback power supply circuit uses the resistor Rcs to detect the current of the secondary side, and uses the transistor bMOS to switch the current. The resistor Rcs needs to use a high-precision resistor for sensing the current, so it is expensive, and additional PCB space is required to accommodate the resistor Rcs. [0003] In view of this, the present invention proposes an innovative power path switch circuit to address the shortcomings of the above-mentioned prior art. Contents of the invention [0004] In one aspect, the present invention provides a power path switch circuit for conducting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00
CPCH02M1/00
Inventor 吴信义唐健夫
Owner RICHTEK TECH