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DC/DC converter and display device including the same

A DC converter, a significant technology, applied in the direction of output power conversion devices, instruments, control/regulation systems, etc., can solve the problems that EMI cannot be reduced, oscillation components cannot be fundamentally eliminated, etc., and the number of components can be reduced and reduced The effect of EMI

Active Publication Date: 2014-06-18
TIANMA MICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oscillatory components cannot be eliminated fundamentally
EMI cannot be reduced even by applying this conventional technique

Method used

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  • DC/DC converter and display device including the same
  • DC/DC converter and display device including the same
  • DC/DC converter and display device including the same

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0070] In a display device, in order to generate power for various ICs such as a driver IC and a timing controller for driving a display device, a power supply circuit (DC / DC converter) that receives a single input voltage and generates power for various ICs is used . A block diagram of the entire display device is shown in Figure 13 middle.

[0071] Generally, in the case of a step-up circuit or a step-down circuit, a DC / DC converter is constituted by components or elements such as an inductor 4 , a rectification diode 6 , a field effect transistor (FET), and a smoothing capacitor (C).

[0072] will use equal to V IN the input voltage and is equal to V OUT The output voltage description of the figure 1 The DC / DC converter circuit (boost circuit) shown.

[0073] exist figure 1 Among them, the DC / DC converter of the present invention has a signal input terminal V IN 2 series connected inductor 4, rectifier diode 6, and V IN 2 is connected to the input S of the DC / DC ...

no. 2 approach

[0153] In the first embodiment, an example in which the first switching circuit 24 and the second switching circuit 26 are controlled and the ringing frequency varying circuit 30 is driven using the switching timing control circuit 28 has been described. In the second embodiment, an example of a configuration using a simple delay circuit without using the switching timing control circuit 28 will be described.

[0154] Figure 8 is the circuit configuration diagram. Through this action, such as Figure 9 As shown, a waveform delayed by using the timing of the switching circuit is formed.

[0155] will mainly be paired with figure 1 The differences are explained. Figure 8 neutralize figure 1 The biggest difference of the first embodiment shown is the DC / DC oscillation circuit IC (for booster) 34 . In the DC / DC oscillation circuit IC (for boosting voltage) 34 , a delay control circuit 32 is provided instead of the second switching circuit 26 . The delay control circuit ...

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PUM

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Abstract

The present invention is directed to sufficiently reduce the level of EMI which occurs from a switching FET in a DC / DC converter and minimize deterioration in efficiency of a power supply. A DC / DC converter includes a switching circuit for driving a switching FET for increasing or decreasing voltage, and a switching circuit for driving a ringing frequency changing circuit. One end of a capacitor is connected to a drain of the switching FET for increasing or decreasing voltage, and the other end of the capacitor is connected to a drain of an FET for the ringing frequency changing circuit. A source of the FET for the ringing frequency changing circuit is connected to GND, and a control circuit is provided which makes the ringing frequency changing circuit valid so that a ringing frequency becomes low only in a ringing frequency component exerting large influence on deterioration in EMI.

Description

technical field [0001] The present invention relates to a DC / DC converter and a display device including the DC / DC converter, and in particular, to minimizing a drop in efficiency of a DC / DC converter in a case where the DC / DC converter is configured by a switching circuit A DC / DC converter with reduced EMI and a display device including the DC / DC converter. Background technique [0002] In recent years, along with the increase in size and resolution (high definition) of panels of thin display devices, the transmission frequency of video signals in the devices has increased. Unnecessary radiation (EMI: Electromagnetic Interference: Electromagnetic Interference: Electromagnetic Interference) generated by a display device is also increasing as the size and resolution increase. [0003] Sources of EMI include ICs that output clock signals on signal processing boards (printed circuit boards) on which circuit components for driving display devices are mounted, noise from power s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155H02M1/44
CPCH02M3/158G05F1/467G05F1/563H02M1/44
Inventor 大贺功一
Owner TIANMA MICRO ELECTRONICS CO LTD
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