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Dual channel power supply with true reverse current blocking

A reverse current, power switch technology, applied in the parallel operation of DC power supply, electrical components, electronic switches, etc., can solve the problem of not providing true reverse current blocking and hot swap functions, and limiting applicability

Inactive Publication Date: 2014-08-13
FAIRCHILD SEMICON SUZHOU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Existing dual input power path switching devices are often offered with form factor and power consumption requirements that limit their applicability in many applications including portable and / or wireless applications
These existing power switching devices also do not provide true reverse current blocking and hot-swap functionality

Method used

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  • Dual channel power supply with true reverse current blocking
  • Dual channel power supply with true reverse current blocking
  • Dual channel power supply with true reverse current blocking

Examples

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Embodiment Construction

[0011] In general, the present invention provides a dual-channel power supply with true reverse current blocking (TRCB) that can be implemented in a monolithic integrated circuit with a simplified Especially advantageous in applications with small form factor and / or hot-swap capability. The dual-channel power supply provides protection in the form of blocking reverse current, preventing current flow from the load V OUT return to the input channel V inA and V inB , regardless of whether the state of each channel input switch is open or closed (that is, on or off). still on the input channel V inA and V inB Reverse current blocking protection is provided between them. This reverse current blocking, which provides protection whether the switch is open or closed, is also known as TRCB.

[0012] figure 1 A top-level system block diagram 100 consistent with various embodiments of the invention is shown. Shown is a power switching circuit 102 configured with TRCB functionalit...

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PUM

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Abstract

A power supply system includes a power supply switch (102) including a first input voltage port, a second input voltage port, and an output voltage port; and a comparator circuit (104) configured to compare a first input voltage (VinA) at the first input voltage port with a second input voltage (VinB) at the second input voltage port, and select a maximum of the first input voltage and the second input voltage. The comparator circuit (104) is further configured to couple the selected maximum voltage to an n-well region of the power supply switch (102) to block reverse current flow from the output voltage port to the first and the second input voltage ports, and further block reverse current flow from the first input voltage port to the second input voltage port. The system can provide true reverse current blocking and hot swap capability.

Description

technical field [0001] The present invention relates to dual channel power supplies, and more particularly to dual channel power supplies with true reverse current blocking based on maximum voltage selection. Background technique [0002] Existing dual input power path switching devices are typically offered with form factors and power consumption requirements that limit their applicability in many applications, including portable and / or wireless applications. These existing power switching devices also do not provide true reverse current blocking and hot-swap functions. Contents of the invention [0003] The present invention provides a power supply system, which can set true reverse current blocking between each input port and output port and between one input port and another input port. The system also provides hot-swap functionality and can be placed on an integrated circuit, making it suitable for use in mobile and / or wireless applications requiring a reduced form f...

Claims

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Application Information

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IPC IPC(8): H02J1/10H02M3/155
CPCH02M1/10H03K17/6874
Inventor 韩新宽N·孙范俊
Owner FAIRCHILD SEMICON SUZHOU
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