CN106357225A - Common-mode (CM) noise inhibition method of power switching amplifier - Google Patents
Common-mode (CM) noise inhibition method of power switching amplifier Download PDFInfo
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- CN106357225A CN106357225A CN201611049936.9A CN201611049936A CN106357225A CN 106357225 A CN106357225 A CN 106357225A CN 201611049936 A CN201611049936 A CN 201611049936A CN 106357225 A CN106357225 A CN 106357225A
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- Prior art keywords
- power switch
- noise
- power switching
- common
- switching amplifier
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/217—Class D power amplifiers; Switching amplifiers
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
The present invention relates to a kind of control method of power switch amplifier is and in particular to a kind of power switch amplifier common mode
Noise suppressing method, the common-mode noise producing in pulsewidth modulation strategy for suppression.
Background technology
Power switch amplifier generally by power semiconductor, such as insulated gate bipolar transistor (igbt), mosfet
Or other kinds of semiconductor device.Under normal circumstances, in order to control the flow of power of power switch amplifier, adjusted using pulsewidth
System (pwm) strategy is controlled, and pwm strategy will produce the quick change of voltage and then causes differential mode (dm) noise and common mode
(cm) noise, and the generation of these noises will interfere to the normal work of other sensitive elements, or even impact is whole is
The normal use of system.
Therefore, it is necessary to by adjusting certain control strategy suppression common mode noise.
Content of the invention
The purpose of the present invention: design a kind of method of the common-mode noise for suppressing power switch amplifier.
The power switch amplifier common mode noise suppressing method of the present invention, for multiple power switch amplifier stage receipts or other documents in duplicates
Unit is controlled, and each power switch amplifier concatenation unit is made up of the four-leg inverter that two full-bridge inverters are constituted,
Wherein there is stray capacitance c1u between the input positive terminal of four-leg inverter and the earth, exist miscellaneous between input negative terminal and the earth
Spurious capacitance c1n, is connected with paralleing reactor l1 between the outfan of one of full-bridge inverter, another full-bridge inverter
It is connected with paralleing reactor l2 between outfan；Described paralleing reactor l1 and balance reactance between adjacent full-bridge inverter
Device l2 connects, and the paralleing reactor l1 and paralleing reactor l2 of end full-bridge inverter pass through wave filter (2) and load line respectively
Circle (3) connects；
This CM Noise Cancellation realizes the soft of power switch amplifier by the modulation order adjusting pwm control strategy
On-off control, the switch controlled signal phase wherein in synchronization, each power switch amplifier concatenation unit being inputted
With, and in each power switch amplifier concatenation unit, having two upper switching tubes to connect simultaneously, two lower switching tubes are connected.
Described paralleing reactor l1 adopts inductance.
Beneficial effect: the present invention inhibits common-mode noise by the change of power switch amplifier control strategy, need not increase
Plus extra wave filter will reduce the volume and weight of system, and reduce or even eliminate common-mode noise so that the stablizing of system
Property is higher.
Brief description
Fig. 1 is 2 unit cascaded power switch amplifier architecture block diagrams；
Fig. 2 is n unit cascaded power switch amplifier architecture block diagram；
Fig. 3 is the common mode loop equivalent impedance circuit of concatenated power switching amplifier；
Fig. 4 is on off sequence 1 common-mode voltage amplitude；
Fig. 5 is on off sequence 2 common-mode voltage amplitude；
Fig. 6 is on off sequence 3 common-mode voltage amplitude；
Fig. 7 is on off sequence 4 common-mode voltage amplitude.
Wherein, 1- power switch amplifier concatenation unit, 2- wave filter, 3- loading coil, 4- common-mode noise equivalent voltage
Source, 5- wave filter equiva lent impedance, 6- cable equiva lent impedance, 7- stray capacitance equiva lent impedance
Specific embodiment
Below by specific embodiment, the present invention is described in further detail.
The common mode noise rejection strategy of the present invention can be realized in power switch amplifier cascade structure, each grade of receipts or other documents in duplicate
Unit is made up of the four-leg inverter that two full-bridge inverters are constituted.Two full-bridge inverters pass through two paralleing reactors even
Connect, the midpoint of paralleing reactor is used for connecting different concatenation unit and load.Select specific on off sequence can realize two
The particular sequence of purpose, first selection needs to ensure the phase shift between two brachium pontis of full-bridge inverter in each concatenation unit,
Enough circulation can be produced to ensure the realization of ZVT (zvs)；Secondly, power can be opened by the particular sequence of selection
Close the minimum of the common-mode voltage amplitude control that amplifier causes.In some cases, specific modulation system can will cause altogether
The common-mode voltage of mould electric current is completely eliminated.
The circuit block diagram of power switch amplifier cascade structure as shown in figure 1, this topological structure comprises 2 concatenation unit 1,
Each unit is powered by independent current source.All there is stray capacitance in semiconductor device and power input, two concatenation unit over the ground
It is connected with loading coil 3 by cable.
As previously mentioned, common-mode noise will produce serious problem for the Sensitive Apparatuses in system.Loading coil two
The average eguivalent voltage at end is defined as common-mode voltage, and common-mode voltage serves as noise source, and noise source and equivalent loop circuit impedance produce
I is used in two unit cascaded power switch amplifier architecture block diagrams in common mode current such as Fig. 1cmRepresent.Make an uproar to reduce common mode
Sound, typically requires wave filter in the outfan of power amplifier.In Fig. 3, the amplitude of common-mode voltage can be represented with formula (1):
Full-bridge inverter due to two four bridge legs is connected by paralleing reactor, and the midpoint defining equilibrium point boat enterprise is electricity
Position o, formula (1) needs to meet formula (2):
Due to two power inputs not altogether, in stray capacitance, voltage can be expressed as below:
vc1u=vc1n+vdc(3)
vc2u=vc2n+vdc(4)
vc1u+vc1n+vc2u+vc2n=cons tan t (5)
It is based on various above, the stray capacitance (c of the full-bridge inverter of two four bridge legs1u,c2u,c1n,c2n) charging process
It is a transient equilibrium process, that is, all of capacitance voltage is a constant in different switch combinations neutralization.If it is assumed that it is spuious
Electric capacity c1nAnd c2nWhen switching vector selector (0,0,0,0,0,0) acts on, initial voltage is vo, c1uAnd c2uInitial voltage be vo+vdc.
So, the common-mode voltage under different conditions can be derived according to formula (1)～(5).
The case study on implementation of difference on off sequence effect under impact for common-mode voltage is described below, using on off sequence 1
Pulsewidth modulation strategy, wherein 1 represents and manages open-minded on single brachium pontis, and down tube turns off, and 0 represents that on single brachium pontis, pipe turns off, and down tube is open-minded.
The common-mode voltage under different conditions can be derived according to formula (1)～(5), as shown in figure 4, the amplitude of common-mode noise be ±
0.5vdc.
Table 1 on off sequence 1
Using the pulsewidth modulation strategy of on off sequence 2, the common mode under different conditions can be derived according to formula (1)～(5)
Voltage, as shown in figure 5, the amplitude of common-mode noise is ± 0.25vdc, the reduction of common-mode noise amplitude, is necessarily suppressed.
Table 2 on off sequence 2
Using the pulsewidth modulation strategy of on off sequence 3, the common mode under different conditions can be derived according to formula (1)～(5)
Voltage, as shown in fig. 6, the amplitude of common-mode noise is ± 0.25vdc, compared to the control method of on off sequence 1, common-mode noise width
Value reduces, and is necessarily suppressed.
Table 3 on off sequence 3
Using the pulsewidth modulation strategy of on off sequence 4, the common mode under different conditions can be derived according to formula (1)～(5)
Voltage, as shown in Figure 7 it can be seen that passing through the control method of on off sequence 4, so that the amplitude of common-mode noise is 0, will
Common-mode noise completely inhibits.
Table 4 on off sequence 4
Claims (2)
1. a kind of power switch amplifier common mode noise suppressing method, for carrying out to multiple power switch amplifier concatenation unit
Control it is characterised in that: the four bridge legs inversion that each power switch amplifier concatenation unit (1) is made up of two full-bridge inverters
Device forms, and wherein there is stray capacitance c1u between the input positive terminal of four-leg inverter and the earth, between input negative terminal and the earth
There is stray capacitance c1n, between the outfan of one of full-bridge inverter, be connected with paralleing reactor l1, another full-bridge is inverse
It is connected with paralleing reactor l2 between the outfan becoming device；Described paralleing reactor l1 peace between adjacent full-bridge inverter
Weighing apparatus reactor l2 connects, the paralleing reactor l1 and paralleing reactor l2 of end full-bridge inverter pass through respectively wave filter (2) with
Loading coil (3) connects；
This CM Noise Cancellation realizes the Sofe Switch of power switch amplifier by the modulation order adjusting pwm control strategy
Control, wherein identical in the switch controlled signal that synchronization inputs to each power switch amplifier concatenation unit, and
And in each power switch amplifier concatenation unit, having two upper switching tubes to connect simultaneously, two lower switching tubes are connected.
2. power switch amplifier common mode noise suppressing method according to claim 1 it is characterised in that: described balance electricity
Anti- device l1 adopts inductance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611049936.9A CN106357225B (en) | 2016-11-24 | 2016-11-24 | A kind of power switch amplifier common mode noise suppressing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611049936.9A CN106357225B (en) | 2016-11-24 | 2016-11-24 | A kind of power switch amplifier common mode noise suppressing method |
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| CN106357225A true CN106357225A (en) | 2017-01-25 |
| CN106357225B CN106357225B (en) | 2019-02-19 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5442540A (en) * | 1992-06-12 | 1995-08-15 | The Center For Innovative Technology | Soft-switching PWM converters |
| CN1992500A (en) * | 2005-12-27 | 2007-07-04 | 三菱电机株式会社 | Power converting apparatus |
| CN103038990A (en) * | 2008-07-24 | 2013-04-10 | 三菱电机株式会社 | Power converter |
| CN104065259A (en) * | 2013-03-18 | 2014-09-24 | 台达电子工业股份有限公司 | Filter device, power converter and common mode noise inhibiting method |
| CN105210290A (en) * | 2013-04-25 | 2015-12-30 | 株式会社皮尔斯特 | Switching amplifier and control method therefor |
| CN105591537A (en) * | 2014-10-28 | 2016-05-18 | 通用电气公司 | Gradient amplifier, and switching amplifier and operating method thereof |
-
2016
- 2016-11-24 CN CN201611049936.9A patent/CN106357225B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5442540A (en) * | 1992-06-12 | 1995-08-15 | The Center For Innovative Technology | Soft-switching PWM converters |
| CN1992500A (en) * | 2005-12-27 | 2007-07-04 | 三菱电机株式会社 | Power converting apparatus |
| CN103038990A (en) * | 2008-07-24 | 2013-04-10 | 三菱电机株式会社 | Power converter |
| CN104065259A (en) * | 2013-03-18 | 2014-09-24 | 台达电子工业股份有限公司 | Filter device, power converter and common mode noise inhibiting method |
| CN105210290A (en) * | 2013-04-25 | 2015-12-30 | 株式会社皮尔斯特 | Switching amplifier and control method therefor |
| CN105591537A (en) * | 2014-10-28 | 2016-05-18 | 通用电气公司 | Gradient amplifier, and switching amplifier and operating method thereof |
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| CN106357225B (en) | 2019-02-19 |
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