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EMI reduction device and method based on phase modulation

A technology of phase modulation and modulation ratio, which is applied in the automatic control of power, electrical components, etc., and can solve problems such as catastrophic failures

Inactive Publication Date: 2018-06-29
宁波龙营半导体有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catastrophic failure if any element of the circuit fails
Also, jitter from the PLL can cause large frequency offsets

Method used

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  • EMI reduction device and method based on phase modulation
  • EMI reduction device and method based on phase modulation
  • EMI reduction device and method based on phase modulation

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Embodiment Construction

[0049] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0050] The embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention. And in the case of no conflict, the features in the embodiments of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0051] figure 2 A block diagram of an EMI reduction device based on phase modulation according to an embodiment of the present invention is shown. Such as figure 2 As shown, the EMI reduction device based on phase modulation of the present embodi...

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Abstract

The invention relates to an EMI (Electromagnetic Interference) reduction device and method based on phase modulation. The device comprises: a phase offset generator, configured to apply a variable phase offset to each modulation cycle of an input signal; a phase modulation read-only memory, configured to save a coefficient for determining a phase offset applied at a specific moment; and a phase controller, configured to output a modulation signal having a phase offset determined by the coefficient. Phase modulation is performed on a clock signal by using an optimized delay or phase offset curve to expand the energy spectrum of the clock signal so as to reduce EMIS emission, wherein a maximum flat spectral response is produced by using the minimum frequency offset. Since the device does notuse a feedback loop and has a few components, the overall reliability of the system is improved.

Description

technical field [0001] The present invention relates to the technical field of electromagnetic compatibility, in particular to an EMI (electromagnetic interference, electromagnetic interference) reduction device and method based on phase modulation. Background technique [0002] Any electrical switching signal, such as voltage or current, is a major source of electromagnetic interference (EMI) for many digital electronic devices. EMI generated by these electronic devices must be suppressed to avoid interference with other electronic devices and to meet FCC regulations. Traditional methods of reducing EMI include the use of "passive" components such as metal shields, chokes, ferrite beads, resistors, and capacitors. A recent trend has been to utilize an "active" approach, where peak energy concentrated in a narrow band is distributed over a wider frequency band. This technique is commonly referred to as spread spectrum modulation. [0003] The spread spectrum method is mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/18H03L7/085
CPCH03L7/085H03L7/18
Inventor 纳伦达尔·韦努戈帕尔
Owner 宁波龙营半导体有限公司