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DC-DC converter with adaptive switching parameter adjustment

A converter circuit, specific data technology, applied in the field of conversion, to achieve the effect of easy switching

Inactive Publication Date: 2011-01-12
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since PFM pulses are of fixed length once in PFM mode, there is no adjustment for changes in input voltage or required load current

Method used

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  • DC-DC converter with adaptive switching parameter adjustment
  • DC-DC converter with adaptive switching parameter adjustment
  • DC-DC converter with adaptive switching parameter adjustment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] The converter circuit 10 includes a digital controller 20 as switching control means. The digital controller 20 senses the actual value of the output voltage at the terminal Vout through a current monitoring device, namely an analog-to-digital converter (ADC) 40 . It can be seen that in practical implementations the resolution of ADC 40 may be limited. It is known that four voltage levels, preferably arranged symmetrically around the desired output voltage, are sufficient to implement an automatic step-up / down converter. Therefore, these four voltage levels define two signal windows, a small signal window and a large signal window. In a preferred embodiment of the present invention, the small signal window is arranged at a symmetrical position with a distance of 5 mV from the desired output voltage. For large signal windows, a symmetrical level of 20mV is sufficient.

[0040] Furthermore, the digital controller 20 is able to monitor the currents in the different curr...

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PUM

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Abstract

The present invention relates to a fully digital DC / DC automatic up / down converter circuit (10) for converting an input voltage to an output voltage of a predetermined value based on a switching operation. The switching operation comprises switching operation cycles, which comprise at least one switching operation phase. The converter is controlled by digital controller (20), which comprises a look-up table in which a plurality of data is stored. The digital controller uses certain data from said plurality of data with respect to an actual switched operating mode for continuous adjusting begin and end of a switching operation. The switched operating modes are a PWM and a PFM mode. The converter is optimal for portable electronic equipment, which come with a battery pack for power supply. Advantageously, the converter of the invention provides a stable output voltage over the whole range of the input voltage supplied by such battery pack. Further, in most of these cases small ceramic capacitors can be used and there no further need for external components.

Description

technical field [0001] The present application relates to a converter circuit for converting an input voltage into an output voltage of a predetermined value and a corresponding conversion method. Background technique [0002] Regulated or controlled power supplies can be found in virtually all electronic equipment, including battery chargers, cell phones, computers, computer monitors, televisions, audio equipment, and video cameras. A typical component in a power supply may be a converter, such as a DC-DC converter (hereafter simply referred to as a DC-DC converter), which operates on the power supply, generates an AC signal as an intermediate process, and delivers the output signal to the load . [0003] Basically, this DC-DC converter takes a DC input voltage (Vin) and produces a DC output voltage (Vout). Typically, the generated output voltage has a different value or level compared to the input voltage. With regard to the relationship between the input voltage and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158
CPCH02M2001/0012H02M3/1582H02M1/0012H02M3/155H02M3/158
Inventor 亨里克斯·C·J·比特克朗贝特·J·H·福尔默科内利斯·斯廷施特拉
Owner NXP BV