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Single-inductor-multiple-output regulator with synchronized current mode hysteretic control

A controller and inductive technology, used in control/regulation systems, DC power input to DC power output, output power conversion devices, etc., can solve complex designs, lack of energy, and increase system power loss. And other issues

Active Publication Date: 2012-11-14
THE HONG KONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this control method, if the first output has a heavy load, due to the predefined energy transfer priority, the other outputs are likely to be deprived of energy for several cycles, resulting in the other outputs being There is a voltage drop
[0007] For converters using control methods similar to US Patent 7,432,614 and US Patent Publication No. 2011 / 0043181, the system needs to work in Discontinuous-Conduction-Mode (DCM) to reduce cross-modulation, which It will limit the energy load of the system, or cause relatively large current and voltage ripple when the load is large
If this type of control method utilizes quasi-continuous conduction mode (PCCM) or continuous conduction mode (CCM) operation methods, it will reduce the effectiveness of suppressing cross-modulation, and at the same time increase the power loss of the system, making the design more complex. complex

Method used

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  • Single-inductor-multiple-output regulator with synchronized current mode hysteretic control
  • Single-inductor-multiple-output regulator with synchronized current mode hysteretic control
  • Single-inductor-multiple-output regulator with synchronized current mode hysteretic control

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Embodiment Construction

[0027] In general, and not intended to limit the scope of this invention, embodiments of this invention provide a single inductor multiple output DC-to-DC switching converter with fast transient response current mode hysteretic control technique to suppress cross modulation. All outputs are controlled by comparators, a single inductor accumulates energy for each output separately, and the control loop automatically determines the phase allocation for each output based on the energy demand of each output.

[0028] The method of automatically determining the phase allocation for each output according to the energy demand removes the power capability limitation of the time-division control method with fixed time zone allocation for each output. When the output has a large load, the control loop will transfer energy in several consecutive CCM modes, which eliminates the ripple generation problem of the traditional DCM operation timing control method under heavy load conditions.

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Abstract

A single-inductor-multiple-output (SIMO) DC-DC switching regulator with a current-mode hysteretic control technique having an ultra-fast transient response to suppress cross-regulation is provided. The DC-DC switching regulator includes: at least one power source for providing electrical energy; an inductive energy storage element for accumulating and transferring the electrical energy from the input power source to a plurality of outputs; a main switch for controlling energy accumulation at the inductive energy storage element; a plurality of output switches for controlling energy transfer to each of the plurality of outputs; a freewheel switch coupled in parallel with the inductive energy storage element; and a controller, configured to coordinate the plurality of output switches and the main switch.

Description

[0001] Cross References to Related Applications [0002] This patent application claims priority to US Provisional Patent Application No. 61 / 457,660, filed May 9, 2011, which is incorporated herein by reference. technical field [0003] This invention relates generally to DC to DC converters and more specifically to single inductor multiple output switching regulators. The regulator features fast load transient response, low cross-modulation, high efficiency over any load range, and adjustable drive capability. Background technique [0004] Different power supply voltages are already a necessary feature for portable electronic products such as netbooks, personal digital assistant (PDA) phones and portable media players (PMP). DC to DC switching converters are commonly used in these electronic products due to their high power efficiency. Single-Inductor Multiple-Output (SIMO) DC-DC converters can provide the various voltages these applications require. Single-inductor mult...

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Application Information

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IPC IPC(8): H02M3/156
CPCH02M3/158H02M2001/009H02M3/156H02M1/009
Inventor 敬小成莫国泰
Owner THE HONG KONG UNIV OF SCI & TECH
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