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A method for suppressing common mode noise of a power switching amplifier

A power switch, common mode noise technology, applied in the direction of improving amplifiers to reduce noise impact, amplifiers, amplifiers with semiconductor devices/discharge tubes, etc., can solve problems affecting the normal use of the system, normal work interference, etc., to eliminate common Mode noise, reduced volume and weight, and high stability effects

Active Publication Date: 2019-02-19
JINCHENG NANJING ELECTROMECHANICAL HYDRAULIC PRESSURE ENG RES CENT AVIATION IND OF CHINA
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Problems solved by technology

Usually, in order to control the power flow of the power switching amplifier, a pulse width modulation (PWM) strategy is used for control, and the PWM strategy will generate rapid changes in voltage and cause differential mode (DM) noise and common mode (CM) noise, while The generation of these noises will interfere with the normal operation of other sensitive components, and even affect the normal use of the entire system

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  • A method for suppressing common mode noise of a power switching amplifier
  • A method for suppressing common mode noise of a power switching amplifier
  • A method for suppressing common mode noise of a power switching amplifier

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Embodiment Construction

[0017] The present invention will be further described in detail through specific embodiments below.

[0018] The common-mode noise suppression strategy of the present invention can be realized in the cascaded structure of the power switch amplifier, and each cascaded unit is composed of a four-bridge-arm inverter composed of two full-bridge inverters. The two full-bridge inverters are connected through two balance reactors, and the midpoint of the balance reactors is used to connect different cascaded units and loads. Selecting a specific switching sequence can achieve two purposes. First, the selected specific sequence needs to ensure that the phase shift between the two bridge arms of the full-bridge inverter in each cascaded unit can generate enough circulating current to ensure zero-voltage switching. (ZVS) Realization; Second, the selected specific sequence can control the minimum common-mode voltage amplitude caused by the power switching amplifier. In some cases, cert...

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Abstract

The invention relates to a control method of a power switching amplifier, in particular to a common-mode (CM) noise inhibition method of a power switching amplifier. The method is used for inhibiting CM noise generated in a pulse width modulation (PWM) strategy. In the PWM strategy, rapid change of voltage can be generated, then differential-mode (DC) noise and CM noise are caused, and the generated noise can disturb normal work of other sensitive elements and even affect normal use of a whole system. The CM noise inhibition method of the power switching amplifier is used for controlling a plurality of power switching amplifier cascaded units, and switching tube control signals input into all the power switching amplifier cascaded units at the same time are the same; besides, two upper switching tubes are switched on at the same time in each power switching amplifier cascaded unit, and two lower switching tubes are switched on at the same time in each power switching amplifier cascaded unit. The size and weight of the system can be reduced, CM noise is reduced and even eliminated, and thus the stability of the system is higher.

Description

technical field [0001] The invention relates to a control method of a power switch amplifier, in particular to a method for suppressing common-mode noise of a power switch amplifier, which is used for suppressing common-mode noise generated in a pulse width modulation strategy. Background technique [0002] Power switching amplifiers usually consist of power semiconductor devices, such as insulated gate bipolar transistors (IGBTs), MOSFETs, or other types of semiconductor devices. Generally, in order to control the power flow of the power switching amplifier, a pulse width modulation (PWM) strategy is used for control, and the PWM strategy will generate rapid changes in voltage and cause differential mode (DM) noise and common mode (CM) noise, while The generation of these noises will interfere with the normal operation of other sensitive components, and even affect the normal use of the entire system. [0003] Therefore, it is necessary to suppress common-mode noise by adj...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/26H03F3/217
CPCH03F1/26H03F3/217
Inventor 张坤刘东米长宝
Owner JINCHENG NANJING ELECTROMECHANICAL HYDRAULIC PRESSURE ENG RES CENT AVIATION IND OF CHINA
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