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Delay compensation for a DC-DC converter

A DC-DC and converter technology, applied in the field of DC-DC converters, can solve the problems of not considering, increasing the output ripple, increasing the undershoot time period, etc.

Inactive Publication Date: 2011-06-22
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the undershoot period is deliberately increased in time so that the undershoot current is equal to the overshoot current: the effects thus cancel each other out and the resulting average current is the average of the reference peak and valley
Therefore, this prior art compensates for the average current offset, but actually increases the output ripple
Furthermore, this approach is computationally intensive and does not account for variations in cycle delay Td due to process, voltage, and temperature variations

Method used

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  • Delay compensation for a DC-DC converter
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  • Delay compensation for a DC-DC converter

Examples

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Embodiment Construction

[0037] figure 1 A hysteretic converter with loop delay compensation is shown. The basic converter shown in area 1 comprises a high-side switch 2 and a low-side switch 3 connected in series between a supply voltage Vin and ground level 4 . An intermediate node LX between the high-side switch 2 and the low-side switch 3 is connected to the capacitor 4 and one terminal of the inductor 5 . The high-side switch 2 and the low-side switch 3 are driven by corresponding drivers 22 and 23 ; the drivers 22 and 23 are both controlled by the controller 7 .

[0038] The output current from the inductor 5 is sensed with a sense resistor 8 connected between the load 9 and ground.

[0039]In this particular example, the load 9 is shown as a string of light emitting diodes (LEDs); however, the load is not limited to LEDs, but could be, for example, a fluorescent light, a battery being charged, PC circuitry, mobile device electronics, or the like. In each case, the current sense resistor must...

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PUM

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Abstract

A method of controlling a DC-DC converter is disclosed, which provides for compensation of the loop-delay caused by, for instance, delays in operation of the comparator. The method is exemplified with reference to, but not limited to, a hysteretic converter.

Description

technical field [0001] The present invention relates to power supplies, and in particular to DC-DC converters for use in power supplies. Background technique [0002] Many electrical devices, and in particular most modern electronic devices, operate on direct current (DC) power. However, at least as far as stationary power is concerned, the vast majority of stationary electricity, at least for domestic use, is in the form of alternating current (AC) power delivered to households at a rated voltage that depends on geographic location Typically 110V, 220V, 240V. Therefore, there is a great need for an electric power converter capable of converting from AC mains to DC form electric power. [0003] Furthermore, for electrical or electronic equipment powered by a DC power source, it is becoming increasingly common for the equipment to utilize multiple DC voltage levels. Thus, a personal computer may have a DC power supply of 24V, but also include some systems or components tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156
CPCH02M3/1563
Inventor 博比·雅各布·丹尼尔
Owner NXP BV