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dcdc conversion device

A conversion device and output stage technology, which is applied in the direction of output power conversion device, DC power input conversion to DC power output, instruments, etc., can solve problems such as high EMI, abnormal operation of components, and influence on the normal use of electronic equipment, so as to reduce the EMI, slow down part of the slope, reduce the effect of EMI interference

Active Publication Date: 2017-04-26
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the DCDC conversion device will generate high EMI during use, which will affect the normal use of electronic equipment
For example, it may cause radio frequency (Radio Frequency, RF) components of electronic equipment to work abnormally

Method used

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Embodiment Construction

[0028] It is found through research that the reason why the DCDC conversion device generates high electromagnetic interference is that the DCDC conversion device works in a switch state. When in use, the switch will generate a lot of high-order harmonics, so that the DCDC conversion device becomes a source of electromagnetic interference, resulting in high EMI, thereby affecting the normal operation of electronic equipment.

[0029] figure 1 It is a schematic diagram of the circuit structure of a DCDC conversion device. Such as figure 1 As shown, the DCDC output stage drive circuit 1 outputs signals at point A and point B, and outputs drive signals PG and NG through the inverter to drive the MOS transistor in the output stage 2 to turn on or off respectively, and then in the output stage 2 The output terminal LX generates a corresponding output waveform, usually a rectangular wave, which is finally filtered and rectified by the LC filter circuit, and output as a DC output at...

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Abstract

The invention discloses a DC-DC (direct current-direct current) conversion device and belongs to the technical field of electronic circuits. The DC-DC conversion device comprises a DC-DC output-stage driving circuit, a slope adjustment circuit and an output stage. The DC-DC output-stage driving circuit is configured to be suitable for outputting a first waveform, and the first waveform comprises a rising edge and a falling edge which have a first slope absolute value. The slope adjustment circuit is configured to be suitable for modulating the first waveform into a second waveform, at least one of a rising edge and a falling edge of the second waveform includes at least two segments with different slope absolute values which are not larger than the first slope absolute value, and the slope absolute value of at least one segment is smaller than the first slope absolute value. The output stage is configured to be suitable for outputting the second waveform reversely. The DC-DC conversion device has the advantage that a slope of the rising edge and the falling edge of each outputted waveform is decreased, so that EMI (electro-magnetic interference) generated by the DC-DC conversion device is reduced effectively.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a DCDC conversion device. Background technique [0002] Almost every kind of electronic equipment will generate electromagnetic interference signal (Electromagnetic Interference, EMI) when it is in use. EMI will interfere with the signal transmission of the devices in the electronic equipment under working conditions, which may cause adverse effects such as performance degradation or even failure or damage of the electronic equipment. [0003] Power supply is an indispensable and important part of electronic equipment. In a specific application, since different parts of the device may require different input power, it is necessary to adjust the input power accordingly. DC power supply to DC power supply (Direct Current-Direct Current, DCDC) conversion device is a voltage conversion device used to change the input voltage to a fixed output voltage. It has the advanta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155H02M1/44
CPCH02M1/44H02M3/155
Inventor 王永进张洵樊茂李力游
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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