CN101174826B - Power electronic switching circuit and its method for controlling and switching dead time - Google Patents
Power electronic switching circuit and its method for controlling and switching dead time Download PDFInfo
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- CN101174826B CN101174826B CN2006101178435A CN200610117843A CN101174826B CN 101174826 B CN101174826 B CN 101174826B CN 2006101178435 A CN2006101178435 A CN 2006101178435A CN 200610117843 A CN200610117843 A CN 200610117843A CN 101174826 B CN101174826 B CN 101174826B
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Abstract
The present invention provides a power electronic switch circuit and the control shift method of the dead time. The power electronic switch circuit includes a driving signal distributed circuit and a plurality of parallel power transistors connected with the distributed circuit. The driving signal distributed circuit includes a plurality of driving circuits to drive the corresponding power transistors. The control shift method is that a power switch is divided uniformly into a plurality of power transistors, each of which is driven by the corresponding driving circuit. Delays remain uniform between each driving circuit. The present invention divides the dead time generated by the power electronic switch of the prior art and the effects caused into a plurality which are distributed in the dead time, causing the unideal effects generated by factors such as the gate capacitance and the load of the power transistor and current to be weakened and uniformized.
Description
Technical field
The invention belongs to the switch power technology field, the control changing method of particularly a kind of power electronic switching and Dead Time thereof.
Background technology
The Dead Time of power electronic switching is to influence the efficient of power device and the principal element of performance.In switch power technology commonly used, wide Dead Time can cause the conducting of power tube parasitic diode, thereby reduces conversion efficiency; Narrow Dead Time can make power tube occur the situation of conducting simultaneously under certain conditions, thereby makes the inside of switch power converter that a short circuit current take place.These all can influence the conversion efficiency of switching power circuit.And being used for the D power-like amplifier that signal power is amplified, Dead Time can be introduced distortion in the signal of output.
US2006/0012428A1 has described a kind of D class A amplifier A, wherein has the default unit of a Dead Time to be used for controlling the Dead Time of output.But Dead Time more is relevant with the parasitic capacitance of power switch pipe.Method in this invention can not directly be dealt with problems.At F.Nyboe, C.Kaya, L.Risbol, P.Andreani, A 240 W Monolithic Class-DAudio Amplifier Output Stage, ISSCC06, Tech.Papers, Page 344.(Buddhist nun's ripple, Kai Ya, Nice primary, An Deniya, a kind ofly can provide 240 watts of D class audio amplifiers, international solid-state electronic conferencing technology collected works in 2006,344 pages) proposed a kind of two step method of driving and eliminated because the problem of the Dead Time that the driving power switch is produced.But the method that proposes in this article only is applicable in the technology of using high pressure and two traps.Be unfavorable for this circuit is integrated in the SOC (system on a chip).At Marco Berkhout, A Class D Output Stage with Zero Dead Time, ISSCC03, Tech.Paper (Ma Luo can. uncle's cut, a kind of output stage, international solid-state electronic conferencing technology collected works in 2003) in the method that a kind of method with the transistor positive feedback is eliminated Dead Time has been described with the D class A amplifier A in zero dead band.The transistorized size that is used to feed back in this method is very responsive to the influence of the effect in elimination dead band.In actual design, be difficult for playing good effect.
Summary of the invention
The object of the present invention is to provide the control changing method of a kind of power electronic switching circuit and Dead Time thereof, with reduction or the Dead Time of homogenizing power electronic switching efficient and Effect on Performance to power device.
For reaching above-mentioned purpose, the present invention adopts following technical scheme:
A kind of power electronic switching circuit comprises the power tube of drive signal distributed circuit and a plurality of parallel connections of being attached thereto, and described drive signal distributed circuit comprises a plurality of drive circuits that are used to drive corresponding power tube.
Preferable, when arriving each power tube, the drive signal that described drive circuit produces has time-delay uniformly.
Preferable, equal by the electric current of each power tube.
A kind of method of controlling the Dead Time of power switched electronic switch is evenly split into a plurality of power tubes with a power switch, and the power tube after each fractionation is driven by the drive circuit of a plurality of correspondences respectively.
Preferable, equal by the electric current of each power tube.
Preferable, when arriving each power tube, the drive signal that each drive circuit produces has time-delay uniformly.
The effect that the present invention reaches the Dead Time that power electronic switching produced in the prior art so produce splits into a plurality of, thereby is evenly distributed in the Dead Time.This makes in Dead Time because the undesirable effect that factors such as the load of the gate capacitance of power tube, power tube and electric current are easy to produce is weakened and homogenizing.
Description of drawings
Fig. 1 is power electronic switching circuit embodiment of the present invention;
Fig. 2 is the input and output waveform schematic diagram of drive signal generation circuit of the present invention;
Fig. 3 is drive signal distributed circuit embodiment in the power electronic switching circuit of the present invention;
Fig. 4 is the equivalent electric flow graph of the whole output of embodiment of the invention power switch circuit.
Embodiment
As shown in Figure 1, a kind of power electronic switching circuit comprises the power tube of drive signal distributed circuit and a plurality of parallel connections of being attached thereto, and described drive signal distributed circuit comprises a plurality of drive circuits that are used to drive corresponding power tube.Described drive signal is to have the evenly signal of time-delay when arriving each power tube.
A kind of method of controlling the Dead Time of power switched electronic switch the power switch of traditional total transmission current is split into the power tube of a plurality of identical currents, and the power tube of each transmission current is driven by corresponding drive circuit respectively.
Among Fig. 1, the input and output signal waveform of drive signal distributed circuit (Driving Signal Distributor) as shown in Figure 2.From CP
1/ CN
1, CP
2/ CN
2..., CP
n/ CN
n, drive in order respectively corresponding power switch (Power MOSFET) 1,2 ..., n.Like this because the load current that each power switch flow through is the 1/n of full load electric current.
A circuit that simply is used to realize above-mentioned functions as shown in Figure 3.Need to prove at this; drive signal distributed circuit of the present invention is not limited to mode shown in Figure 3; those skilled in the art is after understanding the present invention; need not performing creative labour and just can design the drive signal distributed circuit of multiple realization above-mentioned functions, these are all within protection scope of the present invention.
Switch moment at switch, the electric current that flows through load as shown in Figure 4.Illustrated the waveform of the electric current that the process power switch is exported to illustrate among the figure.Along with the substep of distribution switch from i=1 to n drives, the equivalent current of circuit output is to improve near linear pattern.Waveform shown in the figure can be used for the situation when electric current descends equally.
In such driving situation, following advantage is arranged:
1, (this amplifier is directly realized power amplification and is not needed to carry out analog-converted from digital voice data for the D power-like amplifier, so-called digital power amplifier or D class A amplifier A) middle power switch, because its output current is approaching linear curve output, thus in switching over moment since the non-linear effect that transistor switch moment nonlinear resistance is introduced be minimized.
2, for power switch in D power-like amplifier and the Switching Power Supply, owing to its actual switching over time is divided into a plurality of little switching times. For independent P cock, its Dead Time introduce such as short circuit current, the problems such as the conducting of parasitic diode have obtained effective alleviation, have improved simultaneously the efficient of conversion.
3, proposing power electronic switching circuit among the present invention is easier in single-chip integrated.
Claims (2)
1. power electronic switching circuit is characterized in that: comprise the drive signal distributed circuit and the power tube of a plurality of parallel connections of being attached thereto, described drive signal distributed circuit comprises a plurality of drive circuits that are used for driving respectively corresponding power tube; There is time-delay uniformly in the drive signal that each drive circuit in described a plurality of drive circuit produces when arriving the corresponding power tube of this drive circuit in regular turn; Described time-delay is less than the Dead Time length of power electronic switching; Electric current by each power tube equates.
2. a method of controlling the Dead Time of power switched electronic switch is characterized in that: a power switch is evenly split into a plurality of power tubes; Power tube after each splits is driven by the pairing one drive circuit of this power tube in a plurality of drive circuits respectively; Electric current by each power tube equates; There is time-delay uniformly in the drive signal that each drive circuit produces when arriving a corresponding power tube in regular turn; Described time-delay is less than the Dead Time length of power electronic switching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101178435A CN101174826B (en) | 2006-11-01 | 2006-11-01 | Power electronic switching circuit and its method for controlling and switching dead time |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101178435A CN101174826B (en) | 2006-11-01 | 2006-11-01 | Power electronic switching circuit and its method for controlling and switching dead time |
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| Publication Number | Publication Date |
|---|---|
| CN101174826A CN101174826A (en) | 2008-05-07 |
| CN101174826B true CN101174826B (en) | 2011-06-08 |
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| CN2006101178435A Active CN101174826B (en) | 2006-11-01 | 2006-11-01 | Power electronic switching circuit and its method for controlling and switching dead time |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6288605B1 (en) * | 1999-01-19 | 2001-09-11 | Stmicroelectronics S.R.L. | Power switching output stage with dead zone minimization and possibility of parallel synchronous connection |
| CN2554861Y (en) * | 2001-12-05 | 2003-06-04 | 周仕祥 | AC/DC switch converter with high-efficient and low no-loud loss |
| US20040252430A1 (en) * | 2003-06-12 | 2004-12-16 | Mitsubishi Denki Kabushiki Kaisha | Power semiconductor device |
| JP2005191676A (en) * | 2003-12-24 | 2005-07-14 | Matsushita Electric Ind Co Ltd | Pulse width modulation system driving apparatus |
| CN1808873A (en) * | 2005-07-29 | 2006-07-26 | 上海新时达电气有限公司 | Dead zone compensation method in pulse duration modulation variable frequency power supply |
-
2006
- 2006-11-01 CN CN2006101178435A patent/CN101174826B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6288605B1 (en) * | 1999-01-19 | 2001-09-11 | Stmicroelectronics S.R.L. | Power switching output stage with dead zone minimization and possibility of parallel synchronous connection |
| CN2554861Y (en) * | 2001-12-05 | 2003-06-04 | 周仕祥 | AC/DC switch converter with high-efficient and low no-loud loss |
| US20040252430A1 (en) * | 2003-06-12 | 2004-12-16 | Mitsubishi Denki Kabushiki Kaisha | Power semiconductor device |
| JP2005191676A (en) * | 2003-12-24 | 2005-07-14 | Matsushita Electric Ind Co Ltd | Pulse width modulation system driving apparatus |
| CN1808873A (en) * | 2005-07-29 | 2006-07-26 | 上海新时达电气有限公司 | Dead zone compensation method in pulse duration modulation variable frequency power supply |
Non-Patent Citations (1)
| Title |
|---|
| 全文. |
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| CN101174826A (en) | 2008-05-07 |
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