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Pulse Width Modulation Load Sharing Bus

A bus and controller technology, applied in the field of load sharing control, can solve problems such as expensive

Active Publication Date: 2018-10-09
MICROCHIP TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

DACs can be large and expensive to implement in power supply systems
Digital techniques can provide better noise immunity, but existing digital techniques use communication protocols that are sensitive to noise transients present in switching power supply modules

Method used

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  • Pulse Width Modulation Load Sharing Bus
  • Pulse Width Modulation Load Sharing Bus
  • Pulse Width Modulation Load Sharing Bus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] The power supply module has outputs coupled in parallel and transmits load sharing balance information on a single wire load sharing bus. A pulse width modulated (PWM) signal represents the output load of each of the power supply modules on the single wire load sharing bus. The PWM load sharing signal width (asserted time) of the PWM signal represents the output load of the corresponding power supply module. Each of the power supply modules detects assertion of the PWM signal on the load share bus, and then each simultaneously drives the load share bus with a PWM signal indicative of its respective output load . The power supply module with the largest percentage load will assert its PWM load share signal the longest, and then the other power supply modules will adjust their output to more evenly supply power output to the load.

[0025] According to an embodiment of the present invention, each power supply module transmits an effective low PWM load current sharing si...

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Abstract

Power supply modules have outputs coupled in parallel and convey load share balancing information over a single wire load share bus. Pulse width modulation (PWM) signals represent output loading of each of the power supply modules over the single wire load share bus. The PWM load share signal width (time asserted) of the PWM signal represents the output loading of the respective power supply module. Each of the power supply modules detect the assertion of the PWM signal on the load share bus and then each of them simultaneously drive the load share bus with a PWM signal representing their respective output loading. The power supply module having the greatest percent loading will assert its PWM load share signal longest, and the other power supply modules will thereafter adjust their outputs to more evenly supply power outputs to the load.

Description

technical field [0001] The present invention relates to the control of load current sharing between paralleled power supplies, and more particularly, to the use of pulse width modulation (PWM) in controlling load current sharing between paralleled power supplies. Background technique [0002] Many large electronic systems (eg, computer servers, disk storage arrays, telecommunications equipment, etc.) require large amounts of operating power and this operating power must be highly reliable. A common approach for system designers is to implement a system power supply as multiple smaller power supply modules. Connect the outputs of several smaller power supply modules together in parallel to provide the required operating power. Typically, there are more power supply modules in the system power system than needed to supply the existing load. This arrangement enables removal (eg, unplugging) of a failed power supply module while the electronic system is operational and may not...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/10H02M3/158
CPCG06F1/263H02J1/102H02M3/1584
Inventor 布莱恩·克里斯
Owner MICROCHIP TECH INC