Controller and control method for dc-dc converter

一种DC-DC、转换器的技术，应用在DC-DC转换器领域

Active Publication Date: 2007-03-14
CYPRESS SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, losses in a linear regulator are independent of the difference between input and output current

Method used

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  • Controller and control method for dc-dc converter
  • Controller and control method for dc-dc converter
  • Controller and control method for dc-dc converter

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Embodiment Construction

[0030] In the drawings, like reference numerals are used for like elements.

[0031] The DC-DC converter 12 according to the first embodiment of the present invention will be described below with reference to the drawings.

[0032] FIG. 10 is a schematic block diagram of an electronic device 10 including a DC-DC converter 12 . The electronic device 10 is portable, and is driven with power supplied from a built-in battery 11 thereof. The battery 11 is connected to a DC-DC converter 12 as a power supply circuit. The DC-DC converter 12 is connected to an internal circuit 13 such as a CPU. The DC-DC converter 12 converts the input voltage Vin supplied from the battery 11 into an output voltage Vout which is a constant voltage for driving the internal circuit 13 . The DC-DC converter 12 supplies an output voltage Vout to the internal circuit 13 .

[0033] The configuration of the DC-DC converter 12 is described below.

[0034] Referring to FIG. 7, the DC-DC converter 12 as a v...

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PUM

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Abstract

The invention discloses a DC-DC converter whose conversion efficiency does not decrease due to the change of the input voltage. The mode control circuit of the DC-DC converter monitors the input voltage, the output voltage generated from the input voltage, and the output current. The output current changes according to the output voltage. Based on the input voltage, output voltage, and consumption current of the controller of the DC-DC converter, the mode control circuit generates a signal consistent with the load current at which the efficiency of the switching regulator and the efficiency of the linear regulator Basically equal. The mode control circuit also compares a signal corresponding to the output current with a signal consistent with the load current to generate a mode control signal. The controller makes the DC-DC converter work as a switching regulator or a linear regulator according to the mode control signal.

Description

technical field [0001] The present invention relates to DC-DC converters, and more particularly, to controllers and control methods for DC-DC converters. Background technique [0002] Many portable electronic devices are coming into use in recent years. Portable devices use batteries as a driving power source. The output voltage of the battery decreases as the device is used or the battery is discharged. The electronic device includes a DC-DC converter for converting the battery voltage to a constant voltage. The conversion efficiency of a DC-DC converter affects the operating time of an electronic device driven by a battery. Electronic devices may require varying amounts of current to operate. Taking this into consideration, electronic equipment requires a DC-DC converter with high conversion efficiency for any amount of current and a controller for such a DC-DC converter. [0003] In the prior art, portable electronic devices use switching DC-DC converters (hereinafte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155G05F1/56
CPCY02B70/1466H02M3/1588H02M2001/0045H02M1/0045Y02B70/10H02M3/155
Inventor 长谷川守仁
Owner CYPRESS SEMICON CORP
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