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Multi-period random digit pulse-width modulation circuit and method

A random digital and pulse width modulation technology, applied in the field of pulse width modulation, multi-period random digital pulse width modulation circuit, can solve the problems of noise interference, vibration, motor audio noise, etc., achieve great flexibility, realize spectrum expansion, reduce Effects of EMI Conducted Radiation Levels

Inactive Publication Date: 2011-10-12
SHENZHEN AEROSPACE NEW POWER TECH
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Problems solved by technology

[0003] In order to solve the existing technology in the vicinity of the switching frequency or the integer multiple of the switching frequency, there is a strong narrow-band audio noise, the strength and spectral characteristics of the noise will make the system and the surrounding circuits prone to noise in the audio range Interference, so that the motor produces audio noise and vibration and other technical problems, the invention provides a multi-cycle random digital pulse width modulation circuit
[0004] In order to solve the existing technology in the vicinity of the switching frequency or the integer multiple of the switching frequency, there is a strong narrow-band audio noise, the strength and spectral characteristics of the noise will make the system and the surrounding circuits prone to noise in the audio range Interference, so that the motor produces audio noise and vibration and other technical problems, the invention provides a multi-period random digital pulse width modulation method

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  • Multi-period random digit pulse-width modulation circuit and method
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Embodiment Construction

[0016] Random PWM (Pulse Width Modulation-pulse width modulation) technology is one of the effective methods to reduce EMI (Electromagnetic Interference-electromagnetic interference) of power electronic switches. The random modulation technology does not need to change the topological structure of the power electronic system, and has no additional requirements for the design of the system and filter. Using the random modulation technology to suppress EMI does not increase the volume of the system. It is an optimized hard-switching modulation technology. The random modulation technology is to add a random signal distributed according to a certain probability law to the switching signal, so that the switching signal becomes an aperiodic signal, and the energy originally concentrated on the switching frequency and its harmonic frequency is shared in the entire frequency domain. Therefore, the discrete harmonic amplitude is effectively reduced, the power spectrum presents a more co...

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Abstract

The invention relates to a multicycle random digital impulse width modulation circuit and a method thereof. The multicycle random digital impulse width modulation circuit comprises a multicycle random digital impulse width modulation module, a linear feedback shift register module and a multiplexer module; wherein, the multicycle random digital impulse width modulation module is connected with the linear feedback shift register module which is connected with the multiplexer module. The multicycle random digital impulse width modulation method is split jointed a forward-directional toothed wave and back-directional toothed wave. The technical scheme of the invention can choose one among toothed wave, pyramidal wave and random impulse width modulation according to the requirements, thereby having great flexibility. The realization of the random impulse width modulation can realize frequency spectrum spreading, thereby effectively reducing the EMI conduction and radiation level of DPWM.

Description

technical field [0001] The invention belongs to the technical field of power electronics and relates to pulse width modulation technology, in particular to a multi-period random digital pulse width modulation circuit and method. Background technique [0002] Fixed-period PWM (Pulse Width Modulation) pulse width modulation technology is widely used in power electronics technology, but the working waveform of the fixed-period PWM modulation signal is a periodic square wave, which contains rich high frequency near the switching frequency and the integer multiple of the switching frequency. Sub-harmonics, these undesired harmonics will reduce the electromagnetic compatibility quality of the whole system, produce a strong broadband electromagnetic emission source, generate large noise in other circuits, and even make other circuits unable to work normally. For the motor, it is easy to generate large audio noise and vibration in the motor. Determined by the characteristics of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K7/08H02M1/08
Inventor 张东来王骞王毅佟强姚雨迎
Owner SHENZHEN AEROSPACE NEW POWER TECH
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