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Multiphase dcdc converter and method for controlling phase exit

A converter and output voltage technology, applied in the field of switching power supply, can solve the problems of high difficulty and high cost, and achieve the effect of overcoming high cost, low disturbance and reducing ripple

Active Publication Date: 2019-09-20
深圳芯智汇科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a multi-phase DCDC converter and a method for controlling phase exit thereof to reduce the ripple of the output voltage generated by the multi-phase DCDC at the moment of closing the phase, and to overcome the above-mentioned defects of the prior art. The existing technology has the defects of high cost and high difficulty in implementation

Method used

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  • Multiphase dcdc converter and method for controlling phase exit
  • Multiphase dcdc converter and method for controlling phase exit

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Embodiment Construction

[0027] Now in conjunction with the accompanying drawings, the preferred embodiments of the present invention will be described in detail.

[0028] figure 1 A functional block diagram of a multiphase DCDC converter according to an embodiment of the present invention is shown, as figure 1 As shown, the multiphase DCDC converter 10 includes a first regulation module 104 , a second regulation module 106 and a shutdown module 108 .

[0029] When the multiphase DCDC converter 10 changes from heavy load to light load, the load current decreases accordingly. At this time, in order to maintain the utilization efficiency of DCDC, the multiphase DCDC converter 10 determines the phase to be turned off according to the load current.

[0030] The first adjustment module 104 is configured to reduce the duty cycle of the phase from an initial duty cycle value when the phase starts exiting to a temporary duty cycle value, and then maintain the temporary duty cycle value for a first time peri...

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Abstract

The present invention provides a polyphase DCDC (Direct current to direct current) converter. The polyphase DCDC converter comprises: a first regulation module configured to reduce the phase duty ratio from the initial duty ratio value when the phase starts to withdraw to a temporary duty ratio value and maintain the temporary duty ratio value in a first time quantum; a second regulation module configured to reduce the phase duty ratio to a first duty ratio value after the first time quantum, and maintain the first duty ratio value in a second time quantum; and a closing module configured to completely close the phase after the second time quantum. The present invention further provides a phase withdrawing control method of the polyphase DCDC converter. The polyphase DCDC converter and the phase withdrawing control method thereof are applied to the switch power supply field so as to reduce the ripple wave of the output voltage generated at the moment of closing the phase through the polyphase DCDC and overcome the defects that the cost is high and the realization difficulty is high in the prior art.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a multi-phase DC-DC converter and a method for controlling phase exit. Background technique [0002] When the multi-phase DCDC (Direct current to direct current, direct current to direct current) converter changes from high load to low load, it tends to turn off some phases accordingly to maintain the high output efficiency of DCDC, while suddenly turning off some phases will cause DCDC The output current decreases instantaneously, so that the output voltage produces ripples, and the ripple amplitude is large, even exceeding the load tolerance range. In the prior art, the application text of the invention with the application number 201510098033.9 discloses that a DC-DC converter produces a smooth transition between transmission modes by using a digital-to-analog converter in the control path of each output power level. The DAC is controlled by a digital up / down counter, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14H02M3/156
Inventor 段毅君
Owner 深圳芯智汇科技有限公司