Efficient step-down DC-DC (Direct Current-Direct Current) converter

A DC-DC and converter technology, applied in the field of electronic circuits, can solve problems such as low conversion efficiency, achieve the effects of reducing drive loss, improving system conversion efficiency, and improving light-load conversion efficiency

Active Publication Date: 2013-10-23
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under light load conditions, the proportion of this part of the loss is prominent, making the conversion efficiency of the system low at light load

Method used

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  • Efficient step-down DC-DC (Direct Current-Direct Current) converter
  • Efficient step-down DC-DC (Direct Current-Direct Current) converter
  • Efficient step-down DC-DC (Direct Current-Direct Current) converter

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Embodiment

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] The step-down DC-DC converter in the present invention includes two parts: a power circuit and a control circuit 101 . see figure 1 , the circuits other than the control circuit 101 are power circuits.

[0032] see figure 1 , the topology of the power circuit is a buck type. It includes a power switch tube SW, a synchronous rectifier tube SR and a filter feedback circuit 102 . The input terminal Vin of the power circuit is the power input terminal of the DC-DC converter, and the output terminal Vout thereof is the power output terminal of the DC-DC converter.

[0033] see figure 2 , the above-mentioned power switch tube SW is composed of five P-type MOS tubes with the same aspect ratio: SW4-SW0 arranged side by side. The sources of the five P-type MOS transistors are all connected to the power supply input terminal Vin, the drain...

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Abstract

The invention discloses an efficient step-down DC-DC (Direct Current-Direct Current) converter. The converter comprises a power circuit and a control circuit, wherein a power part comprises a power switch tube, a synchronous rectifier tube, and a filter feedback circuit; and the control circuit comprises a current detection circuit, a gate width control circuit, a logic control and grid driving circuit, a pulse width modulating circuit, a dead zone predicating circuit and a dead zone circuit. By adopting the DC-DC converter provided by the invention, an unstable DC voltage can be lowered and efficiently converted to a stable DC voltage. When the DC-DC converter works in a light load condition, the gate width control circuit changes the sizes of the power switch tube and the synchronous rectifier tube so as to reduce the driving loss in the power circuit and improve the light-load conversion efficiency. The dead zone predicating circuit detects the residual dead zone time in real time, records the detected dead zone time, and then controls the dead zone time interval by which the dead zone circuit is added into a switch signal so as o minimize the dead zone time, reduce the conduction loss caused by the residual dead zone time, and improve the conversion efficiency of the system.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits and relates to analog integrated circuits. It particularly relates to a high-efficiency step-down DC-DC converter, which mainly adopts grid width control technology and dead zone predictive control technology to improve the conversion efficiency of the system. Background technique [0002] It is extremely common that the supply voltage in an electronic product does not match the voltage required inside the electronic product. Many portable devices are powered by batteries, and the output voltage of the batteries changes with the length of time the batteries are used, so the supply voltage is usually not a constant voltage. The chip inside the electronic product needs a stable power supply voltage, and the power management chip has become an indispensable part of the electronic product. The quality of the power management chip directly affects the technical performance index of the ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158
Inventor 江金光保欢
Owner WUHAN UNIV
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