CN102916570B - Isolated driving circuit - Google Patents
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- CN102916570B CN102916570B CN201210364947.1A CN201210364947A CN102916570B CN 102916570 B CN102916570 B CN 102916570B CN 201210364947 A CN201210364947 A CN 201210364947A CN 102916570 B CN102916570 B CN 102916570B
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Abstract
The invention relates to an isolated driving circuit, which comprises an isolated driving transformer, a double-end excitation signal driving and controlling circuit and a pulse-driving signal conversion circuit, wherein the double-end excitation signal driving and controlling circuit is used for generating a first pulse driving signal and a second pulse driving signal; and the pulse-driving signal conversion circuit is used for converting an output signal of a secondary winding into a driving signal which is used for driving a corresponding power switching tube. The isolated driving circuit provided by the invention can avoid resonance oscillation caused by the magnetic inductances of a blocking capacitor and a driver transformer.
Description
Technical field
The present invention relates to drive circuit field, particularly relate to a kind of isolated drive circuit avoided due to capacitance and driving transformer magnetizing inductance generation resonance.
Background technology
Pulse transformer isolated drive circuit is a kind of common power switch tube drives circuit, simply, do not need to provide the lower and pulse signals of insulating power supply, cost without advantages such as transmission delays because it has circuit structure, the requirement of the electrical isolation of power switch tube drives circuit, rapidity and strong actuating force can be met.
As shown in Figure 1, Fig. 1 is a kind of existing pulse transformer isolated drive circuit, and this isolated drive circuit comprises resistance R1, capacitance C1 and isolation drive transformer T1, and this isolation drive transformer T1 comprises former limit winding and vice-side winding.When the driving pulse from control circuit is high level, and be added between A point and former limit winding reference ground B, after isolated variable, negative pressure bootstrapping, in C point and the D output of vice-side winding reference ground, be used for driving corresponding power switch pipe.When the driving pulse saltus step from control circuit is low level, capacitance C1 provide negative pressure, and isolation drive transformer T1 carries out magnetic reset.The voltage steady-state value of capacitance C1 is U
c1=EU
drive, wherein the duty ratio of driving pulse is E(0<E<1), the voltage magnitude passing to the driving pulse of the vice-side winding of isolation drive transformer T1 is U
s=(1-E) U
drive, this voltage magnitude changes along with the conversion of duty ratio E, like this when duty ratio is larger, is difficult to ensure the voltage of enough amplitudes to drive corresponding power switch pipe.
As shown in Figure 2, Fig. 2 is another kind of existing pulse transformer isolated drive circuit, this isolated drive circuit comprises resistance R1, capacitance C1, isolation drive transformer T1, bootstrap capacitor C2 and bootstrap diode D1, and isolation drive transformer T1 comprises former limit winding and vice-side winding.This isolated drive circuit is provided with bootstrap capacitor C2 and bootstrap diode D1 at the vice-side winding of isolation drive transformer T1.The voltage steady-state value of capacitance C1 is still U
c1=DU
drive, the voltage steady-state value of bootstrap capacitor C2 is U
c2=U
c1-U
0, U
0for the conduction voltage drop of bootstrap diode D1, its value is less.When the driving pulse from control circuit is high level, and when being added between A point and former limit winding reference ground B, the original edge voltage of isolation drive transformer T1 is U
drive-U
c1if the turn ratio of isolation drive transformer T1 is 1:1, the secondary voltage of isolation drive transformer T1 is also U
drive-U
c1, the voltage be applied to like this on corresponding power switch pipe is U
s=U
c1-U
0+ U
drive-U
c1=U
drive-U
0, driving voltage voltage magnitude in transmittance process is almost constant.When the driving pulse saltus step from control circuit is low level, capacitance C1 provide negative pressure, and isolation drive transformer T1 carries out magnetic reset.
Although the pulse transformer isolated drive circuit shown in Fig. 2 can ensure when the duty ratio of driving pulse is larger, driven power switch pipe.But the pulse transformer isolated drive circuit shown in Fig. 1 and Fig. 2 all has a shortcoming: two kinds of pulse transformer isolated drive circuits all realize the magnetic reset of isolation drive transformer T1 by capacitance C1.Due to the existence of capacitance C1, when the driving pulse of control circuit turns off, the magnetizing inductance of capacitance C1 and isolation drive transformer T1 can produce resonance, make all to produce very high oscillating voltage at the former vice-side winding of isolation drive transformer T1, the power switch pipe turned off may be caused to mislead.
Therefore, be necessary to provide a kind of isolated drive circuit, to solve the problem existing for prior art.
Summary of the invention
The object of the present invention is to provide a kind of isolated drive circuit avoided due to capacitance and driving transformer magnetizing inductance generation resonance, solve existing isolated drive circuit and produce resonance due to capacitance and driving transformer magnetizing inductance, the technical problem that the power switch pipe turned off misleads may be caused.
For solving the problem, technical scheme provided by the invention is as follows:
The present invention relates to a kind of isolated drive circuit, it comprises:
Isolation drive transformer, comprises former limit winding and vice-side winding;
Both-end pumping signal Drive and Control Circuit, for generation of the first pulse drive signal and the second pulse drive signal, described first pulse drive signal and described second pulse drive signal are inputted by described former limit winding; And
At least one pulse drive signal change-over circuit, for the output signal of described vice-side winding is converted to drive singal, this drive singal for driving corresponding power switch pipe,
The former limit winding switching of described both-end pumping signal Drive and Control Circuit and described isolation drive transformer, the vice-side winding of described isolation drive transformer is connected with described pulse drive signal change-over circuit.
In isolated drive circuit of the present invention, described isolation drive transformer comprises the first former limit winding, described first pulse drive signal is inputted by one end of described first former limit winding, and described second pulse drive signal is inputted by the other end of described first former limit winding.
In isolated drive circuit of the present invention, described isolation drive transformer comprises the first former limit winding and the second former limit winding, described first pulse drive signal is inputted by described first former limit winding, and described second pulse drive signal is inputted by described second former limit winding.
In isolated drive circuit of the present invention, the frequency of described first pulse drive signal is identical with the frequency of described second pulse drive signal, the duty ratio of described first pulse drive signal is identical with the duty ratio of described second pulse drive signal, the high level time of described first pulse drive signal and the high level time of described second pulse drive signal successive, or the high level time of the high level time of described second pulse drive signal and described first pulse drive signal is successive.
In isolated drive circuit of the present invention, when the high level time of described first pulse drive signal and the high level time of described second pulse drive signal successive time, the time point that described second pulse drive signal is converted to high level by low level is converted to low level time point early than equaling described first pulse drive signal by high level;
When the high level time of described second pulse drive signal and the high level time of described first pulse drive signal successive time, the time point that described first pulse drive signal is converted to high level by low level is converted to low level time point early than equaling described second pulse drive signal by high level.
In isolated drive circuit of the present invention, described isolation drive transformer comprises the first vice-side winding and the second vice-side winding;
Described pulse drive signal change-over circuit comprises:
First output circuit, for when described second pulse drive signal is high level, exports the first high level signal, when described second pulse drive signal is low level, exports the first low level signal;
Second output circuit, for when described first pulse drive signal is high level, exports the second high level signal, when described first pulse drive signal is low level, exports the second low level signal; And
OR circuit, comprises first input end, the second input and output; For exporting described first low level signal when described first output circuit, simultaneously during described second described second low level signal of output circuit output, output low level drive singal; Otherwise export high level drive singal;
One end of described first output circuit is connected with described first vice-side winding, and the other end of described first output circuit is connected with the first input end of described OR circuit; One end of described second output circuit is connected with described second vice-side winding, and the other end of described second output circuit is connected with the second input of described OR circuit.
In isolated drive circuit of the present invention, described first output circuit comprises:
First charge-discharge circuit, for shortening the time of the rising edge of described first high level signal, extends the time of the trailing edge of described first high level signal; And
First clamp circuit, for carrying out clamp to described first low level signal.
In isolated drive circuit of the present invention, described second output circuit comprises:
Second charge-discharge circuit, for shortening the time of the rising edge of described second high level signal, extends the time of the trailing edge of described second high level signal; And
Second clamp circuit, for carrying out clamp to described second low level signal.
In isolated drive circuit of the present invention, described isolation drive transformer also comprises the first vice-side winding for subsequent use and the second vice-side winding for subsequent use;
Described pulse drive signal change-over circuit also comprises:
First output circuit for subsequent use, for when described second pulse drive signal is high level, exports the first high level signal, when described second pulse drive signal is low level, exports the first low level signal; And
Second output circuit for subsequent use, for when described first pulse drive signal is high level, exports the second high level signal, when described first pulse drive signal is low level, exports the second low level signal;
One end of described first output circuit for subsequent use is connected with described first vice-side winding for subsequent use, and the other end of described first output circuit for subsequent use is connected with the first input end of described OR circuit; One end of described second output circuit for subsequent use is connected with described second vice-side winding for subsequent use, and the described other end of the second output circuit for subsequent use is connected with the second input of described OR circuit.
In isolated drive circuit of the present invention, described isolated drive circuit comprises the anti-D.C. magnetic biasing circuit of the DC magnetic bias phenomena for preventing described isolation drive transformer, and described anti-D.C. magnetic biasing circuit is connected with described both-end pumping signal Drive and Control Circuit and described isolation drive transformer respectively;
Described anti-D.C. magnetic biasing circuit comprises the first resistance and the first electric capacity, one end of described first resistance is connected with one end of described first electric capacity and described pulse drive signal change-over circuit respectively, and the other end of described first resistance is connected with the other end of described first electric capacity and described isolation drive transformer respectively.
Compared to existing isolated drive circuit, isolated drive circuit of the present invention can be avoided because capacitance and driving transformer magnetizing inductance produce resonance, solve existing isolated drive circuit and produce resonance due to capacitance and driving transformer magnetizing inductance, the technical problem that the power switch pipe turned off misleads may be caused.
For foregoing of the present invention can be become apparent, preferred embodiment cited below particularly, and coordinate institute's accompanying drawings, be described in detail below:
Accompanying drawing explanation
Fig. 1 is a kind of existing pulse transformer isolated drive circuit;
Fig. 2 is another kind of existing pulse transformer isolated drive circuit;
Fig. 3 is the module diagram of the first preferred embodiment of isolated drive circuit of the present invention;
Fig. 4 is the concrete module diagram of the first preferred embodiment of isolated drive circuit of the present invention;
Fig. 5 is the physical circuit figure of the first preferred embodiment of isolated drive circuit of the present invention;
Fig. 6 is the voltage oscillogram of each point in Fig. 5;
Fig. 7 is the signal syntheses schematic diagram of the drive singal by OR circuit of the preferred embodiment of isolated drive circuit of the present invention;
Fig. 8 is the physical circuit figure of the second preferred embodiment of isolated drive circuit of the present invention;
Fig. 9 is the physical circuit figure of the 3rd preferred embodiment of isolated drive circuit of the present invention;
Figure 10 is the physical circuit figure of the 4th preferred embodiment of isolated drive circuit of the present invention;
Figure 11 is the physical circuit figure of the 5th preferred embodiment of isolated drive circuit of the present invention;
Figure 12 is the physical circuit figure of the 6th preferred embodiment of isolated drive circuit of the present invention;
Wherein, description of reference numerals is as follows:
31, both-end pumping signal Drive and Control Circuit;
32, isolation drive transformer;
321, the first former limit winding;
322, the first vice-side winding;
323, the second vice-side winding;
324, the second former limit winding;
325, the first vice-side winding for subsequent use;
326, the second vice-side winding for subsequent use;
33, pulse drive signal change-over circuit;
331, the first output circuit;
332, the second output circuit;
333, OR circuit;
334, the first output circuit for subsequent use;
335, the second output circuit for subsequent use.
Embodiment
The explanation of following embodiment is graphic with reference to what add, can in order to the specific embodiment implemented in order to illustrate the present invention.The direction term that the present invention mentions, such as " on ", D score, "front", "rear", "left", "right", " interior ", " outward ", " side " etc., be only the direction with reference to annexed drawings.Therefore, the direction term of use is in order to illustrate and to understand the present invention, and is not used to limit the present invention.
In the drawings, the unit of structural similarity represents with identical label.
Please refer to Fig. 3, Fig. 3 is the module diagram of the first preferred embodiment of isolated drive circuit of the present invention.This isolated drive circuit comprises isolation drive transformer 32, both-end pumping signal Drive and Control Circuit 31 and pulse drive signal change-over circuit 33.Wherein isolation drive transformer 32 comprises the first former limit winding and vice-side winding; Both-end pumping signal Drive and Control Circuit 31 is for generation of the first pulse drive signal and the second pulse drive signal, and the first pulse drive signal is inputted by one end of the first former limit winding, and the second pulse drive signal is inputted by the other end of the first former limit winding; Pulse drive signal change-over circuit 33 is converted to drive singal for the output signal of the vice-side winding by isolation drive transformer 32, then uses this drive singal to drive corresponding power switch pipe.
Wherein the first former limit winding switching of both-end pumping signal Drive and Control Circuit 31 and isolation drive transformer 32, the vice-side winding of isolation drive transformer 32 is connected with the input of pulse drive signal change-over circuit 33, and the output of pulse drive signal change-over circuit 33 is connected with power switch pipe to be driven.
The concrete structure of each module in isolated drive circuit of the present invention is further illustrated below by Fig. 4 and Fig. 5.Fig. 4 is the concrete module diagram of the first preferred embodiment of isolated drive circuit of the present invention, and Fig. 5 is the physical circuit figure of the first preferred embodiment of isolated drive circuit of the present invention.Wherein isolation drive transformer 32 comprises the first former limit winding 321, first vice-side winding 322 and the second vice-side winding 323.Pulse drive signal change-over circuit 33 comprises the first output circuit 331, second output circuit 332 and OR circuit 333, wherein the first output circuit 331 is for when the second pulse signal is high level, export the first high level signal, when the second pulse drive signal is low level, export the first low level signal; Second output circuit 332, for when the first pulse drive signal is high level, exports the second high level signal, when the first pulse drive signal is low level, exports the second low level signal; OR circuit 333 comprises first input end, the second input and output, for exporting the first low level signal to first input end when the first output circuit 331, when second output circuit 332 exports the second low level signal to the second input simultaneously, output output low level drive singal, otherwise output exports high level drive singal.
One end of first output circuit 331 is connected with the first vice-side winding 322, the other end of the first output circuit 331 is connected with the first input end of OR circuit 333, one end of second output circuit 332 is connected with the second vice-side winding 323, and the other end of the second output circuit 332 is connected with the second input of OR circuit 333.The Same Name of Ends of the first former limit winding 321, first vice-side winding 322 and the second vice-side winding 323 is arranged as shown in Figure 5 herein.
Here OR circuit 333 can adopt integrated logic gates, also can adopt the OR circuit be made up of discrete component.
As can be seen from Fig. 5, the first output circuit 331 comprises the first charge-discharge circuit and the first clamp circuit, and the second output circuit 332 comprises the second charge-discharge circuit and the second clamp circuit.
Wherein the first charge-discharge circuit is for shortening the time of the rising edge of the first high level signal, and extends the time of the trailing edge of the first high level signal; First clamp circuit is used for carrying out clamp to the first low level signal.First charge-discharge circuit comprises the second resistance R2 ', the 3rd resistance R3 ', the 4th resistance R4 ', the first diode D1 ' and the second electric capacity C2 '; First clamp circuit comprises the second diode D2 '.
One end of second resistance R2 ' is connected with one end of the first vice-side winding 322, the other end of the second resistance R2 ' is connected with the positive pole of the first diode D1 ', the negative pole of the first diode D1 ' is connected with the first input end of OR circuit 333, one end of 3rd resistance R3 ' is connected with one end of the first vice-side winding 322, the other end of the 3rd resistance R3 ' is connected with the first input end of OR circuit 333, one end of second electric capacity C2 ' is connected with the first input end of OR circuit 333, the other end of the second electric capacity C2 ' is connected with the other end of the first vice-side winding 322, one end of 4th resistance R4 ' is connected with the first input end of OR circuit 333, the other end of the 4th resistance R4 ' is connected with the other end of the first vice-side winding 322, the positive pole of the second diode D2 ' is connected with the other end of the first vice-side winding 322, the negative pole of the second diode D2 ' is connected with the first input end of OR circuit 333.
Wherein the second charge-discharge circuit for shorten the second high level signal rising edge between, and between the trailing edge extending the second high level signal; Second clamp circuit is used for carrying out clamp to the second low level signal.Second charge-discharge circuit comprises the 5th resistance R5 ', the 6th resistance R6 ', the 7th resistance R7 ', the 3rd diode D3 ' and the 3rd electric capacity C3 ', and the second clamp circuit comprises the 4th diode D4 '.
One end of 5th resistance R5 ' is connected with one end of the second vice-side winding 323, the other end of the 5th resistance R5 ' is connected with the positive pole of the 3rd diode D3 ', the negative pole of the 3rd diode D3 ' is connected with the second input of OR circuit 333, one end of 6th resistance R6 ' is connected with one end of the second vice-side winding 323, the other end of the 6th resistance R6 ' is connected with the second input of OR circuit 333, one end of 3rd electric capacity C3 ' is connected with the second input of OR circuit 333, the other end of the 3rd electric capacity C3 ' is connected with the other end of the second vice-side winding 323, one end of 7th resistance R7 ' is connected with the second input of OR circuit 333, the other end of the 7th resistance R7 ' is connected with the other end of the second vice-side winding 323, the positive pole of the 4th diode D4 ' is connected with the other end of the second vice-side winding 323, the negative pole of the 4th diode D4 ' is connected with the second input of OR circuit 333.
Please refer to Fig. 6, Fig. 6 is the voltage oscillogram of each point in Fig. 5.When isolated drive circuit of the present invention uses, both-end pumping signal Drive and Control Circuit 31 produces the first pulse drive signal and the second pulse drive signal, first pulse drive signal is inputted by one end of the first former limit winding 321 of isolation drive transformer 32, and the second pulse drive signal is inputted by the other end of the first former limit winding 321 of isolation drive transformer 32.The frequency of the first pulse drive signal is identical with the frequency of the second pulse drive signal, the duty ratio of the first pulse drive signal is identical with the duty ratio of the second pulse drive signal, simultaneously the high level time of the first pulse drive signal and the high level time of the second pulse drive signal successive, the first pulse drive signal and the second pulse drive signal are low level subsequently.The high level time that certainly also can be the high level time of the second pulse drive signal and the first pulse drive signal is here successive.
When the first pulse drive signal be high level, the second pulse drive signal be low level time, namely the A ' of Fig. 5 is high potential, B ' is electronegative potential, first pulse drive signal of input exports the first output circuit 331 and the second output circuit 332 to through isolation drive transformer 32, at this moment the C ' of the first output circuit 331 is electronegative potential, the E ' of the first output circuit 331 is discharged by the 3rd resistance R3 ', therefore the E ' of the first output circuit 331 is also electronegative potential, and namely the first input end of OR circuit 333 inputs the first low level signal.The D ' of the second output circuit 332 is high potential, and charged to the F ' of the second output circuit 332 by the 5th resistance R5 ' and the 3rd diode D3 ', therefore the F ' of the second output circuit 332 is also high potential, and namely the second input of OR circuit 333 inputs the second high level signal.The output G ' of such OR circuit 333 is high level drive singal.
When the first pulse drive signal is low level, when second pulse drive signal is high level, namely the A ' of Fig. 5 is electronegative potential, B ' is high potential, second pulse drive signal of input exports the first output circuit 331 and the second output circuit 332 to through isolation drive transformer 32, at this moment the C ' of the first output circuit 331 is high potential, and charged to the E ' of the first output circuit 331 by the second resistance R2 ' and the first diode D1 ', therefore the E ' of the first output circuit 331 is also high potential, namely the first input end of OR circuit 333 inputs the first high level signal.The D ' of the second output circuit 332 is electronegative potential, and the F ' of the second output circuit 332 is discharged by the 6th resistance R6 ', and therefore the F ' of the second output circuit 332 is also electronegative potential, and namely the second input of OR circuit 333 inputs the second low level signal.The output G ' of such OR circuit 333 is still high level drive singal.
When the first pulse drive signal be low level, the second pulse drive signal be low level time, namely the A ' of Fig. 5 is electronegative potential, B ' is also electronegative potential, at this moment the C ' of the first output circuit 331 is electronegative potential, the E ' of the first output circuit 331 is discharged by the 3rd resistance R3 ', therefore the E ' of the first output circuit 331 is also electronegative potential, and namely the first input end of OR circuit 333 inputs the first low level signal.The D ' of the second output circuit 332 is electronegative potential, and the F ' of the second output circuit 332 is discharged by the 6th resistance R6 ', and therefore the F ' of the second output circuit 332 is also electronegative potential, and namely the first input end of OR circuit 333 inputs the second low level signal.The output G ' of such OR circuit 333 is low level drive singal.
Because the first pulse drive signal is identical with duty ratio with the frequency of the second pulse drive signal, be the half of the duty ratio of the drive singal that OR circuit 333 exports, then the first pulse drive signal and the second pulse drive signal input from the difference end of the first former limit winding 321 of isolation drive transformer 32, ensure the magnetic reset of isolation drive transformer 32, and do not need to adopt capacitance to carry out magnetic reset again.
Isolated drive circuit of the present invention is by pulse drive signal change-over circuit 33 simultaneously, first pulse drive signal and the second pulse drive signal are synthesized continuous print drive singal export, on the basis of magnetic reset ensureing isolation drive transformer 32, achieve and the perfection of power switch pipe is driven, below the idiographic flow of the first pulse drive signal and the synthesis of the second pulse drive signal is described.
As shown in Figure 7, Fig. 7 is the synthesis schematic diagram of the drive singal by OR circuit of the preferred embodiment of isolated drive circuit of the present invention.When the first pulse drive signal be high level, the second pulse drive signal be low level time, the E ' of the first output circuit 331 is electronegative potential, and the F ' of the second output circuit 332 is high potential, and the output G ' of OR circuit 333 is high level drive singal; When the first pulse drive signal be low level, the second pulse drive signal be low level time, the E ' of the first output circuit 331 is high potential, and the F ' of the second output circuit 332 is electronegative potential, and the output G ' of OR circuit 333 is high level drive singal.Owing to being converted to low level when the first pulse drive signal by high level, when second pulse drive signal is high level by low transition simultaneously, the E ' of the first output circuit 331 may be caused to be still electronegative potential, and the F ' of the second output circuit 332 has also been transformed into electronegative potential, at this moment the output G ' of OR circuit 333 exports an of short duration low level drive singal while the first pulse drive signal and the conversion of the second pulse drive signal low and high level, and the mistake of power switch pipe may be caused to close.
Therefore the first output circuit 331 is provided with the first charge-discharge circuit and the first clamp circuit, and the second output circuit 332 is provided with the second charge-discharge circuit and the second clamp circuit.When the first pulse drive signal is converted to low level by high level, when simultaneously the second pulse drive signal is high level (time point that the second pulse drive signal is converted to high level by low level is here converted to low level time point early than equaling the first pulse drive signal by high level) by low transition, at this moment the C ' of the first output circuit 331 is high potential, and by the second resistance R2 ' and the first diode D1 ' to the E ' quick charge of the first output circuit 331, make the E ' of the first output circuit 331 can reach high potential fast.And the D ' of the second output circuit 332 is electronegative potential, the F ' of the second output circuit 332 is discharged by the 6th resistance R6 ', under the effect of the 6th resistance R6 ' and the 3rd electric capacity C3 ', the velocity of discharge of the F ' of the second output circuit 332 can be slowed down, make it possible to the high potential time of the F ' of prolongation second output circuit 332.Current potential simultaneously during the F ' electronegative potential of the 4th diode D4 ' of the second clamp circuit further to the second output circuit 332 carries out clamp, makes the electronegative potential of F ' can not damage OR circuit 333 or makes OR circuit 333 produce erroneous judgement.When this ensure that the low and high level of the first pulse drive signal and the second pulse drive signal switches, the output G ' of OR circuit 333 exports high level drive singal.
Be more than the high level time of the high level time of the first pulse drive signal and the second pulse drive signal successive be example, describe and how the first pulse drive signal and the second pulse drive signal synthesized.Certainly here also can the high level time of the high level time of the second pulse drive signal and the first pulse drive signal successive.At this moment when the second pulse drive signal is converted to low level by high level, when simultaneously the first pulse drive signal is high level (time point that the first pulse drive signal is converted to high level by low level is here converted to low level time point early than equaling the second pulse drive signal by high level) by low transition, at this moment the D ' of the second output circuit 332 is high potential, and by the 5th resistance R5 ' and the 3rd diode D3 ' to the F ' quick charge of the second output circuit 332, make the F ' of the second output circuit 332 can reach high potential fast.And the C ' of the first output circuit 331 is electronegative potential, the E ' of the first output circuit 331 is discharged by the 3rd resistance R3 ', under the effect of the 3rd resistance R3 ' and the second electric capacity C2 ', that can slow down the E ' of the first output circuit 331 puts spot speed, makes it possible to the high potential time of the E ' of prolongation first output circuit 331.Current potential simultaneously during the E ' electronegative potential of the second diode D2 ' of the first clamp circuit further to the first output circuit 331 carries out clamp, makes the electronegative potential of E ' can not damage OR circuit 333 or makes OR circuit 333 produce erroneous judgement.When this ensure that the low and high level of the first pulse drive signal and the second pulse drive signal switches, the output G ' of OR circuit 333 exports high level drive singal.
Isolated drive circuit of the present invention also comprises anti-D.C. magnetic biasing circuit, and this anti-D.C. magnetic biasing circuit is for preventing the DC magnetic bias phenomena of isolation drive transformer 32.This anti-D.C. magnetic biasing circuit is connected with both-end pumping signal Drive and Control Circuit 31 and isolation drive transformer 32 respectively.As shown in Figure 5, this anti-D.C. magnetic biasing circuit comprises the first resistance R1 ' and the first electric capacity C1 ', one end of first resistance R1 ' is connected with one end of the first electric capacity C1 ' and pulse drive signal change-over circuit 33 respectively, and the other end of the first resistance R1 ' is connected with the other end of the first electric capacity C1 ' and isolation drive transformer 32 respectively.When difference appears in the duty ratio of the first pulse drive signal and the duty ratio of the second pulse drive signal, isolation drive transformer 32 can produce DC magnetic bias phenomena, makes isolation drive transformer 32 can not magnetic reset completely.And isolation drive transformer 32 magnetic reset in these cases can be ensured by this anti-D.C. magnetic biasing circuit.
Isolated drive circuit of the present invention also comprises power amplification circuit, and the drive singal that this power amplification circuit is used for the output of paired pulses drive singal change-over circuit 33 carries out amplification process.This power amplification circuit is connected with the output of pulse drive signal change-over circuit 33.The power of the drive singal of driving power switching tube can be ensured so further.
Please refer to Fig. 8, Fig. 8 is the physical circuit figure of the second preferred embodiment of figure isolated drive circuit of the present invention.The difference of the present embodiment and the first preferred embodiment is, this isolation drive transformer comprises the first former limit winding 321 and the second former limit winding 324, first pulse drive signal holds input by the A1 ' of the first former limit winding 321, second pulse drive signal holds input by the B2 ' of the second former limit winding 324, can reach the beneficial effect identical with the first preferred embodiment like this.The Same Name of Ends of the first former limit winding 321 and the second former limit winding 324 is arranged as shown in Figure 8 herein.This preferred embodiment except the first pulse drive signal different with the signal input part of the second pulse drive signal, isolated drive circuit in other operation principles and beneficial effect and the first preferred embodiment is same or similar, specifically refers to the first preferred embodiment of above-mentioned isolated drive circuit.
Please refer to Fig. 9, Fig. 9 is the physical circuit figure of the 3rd preferred embodiment of figure isolated drive circuit of the present invention.The difference of the present embodiment and the first preferred embodiment is, this isolation drive transformer also comprises the first vice-side winding 325 for subsequent use, this pulse drive signal change-over circuit also comprises the first output circuit 334 for subsequent use, this first output circuit 334 for subsequent use is for when the second pulse drive signal is high level, export the first high level signal, when the second pulse drive signal is low level, export the first low level signal.One end of first output circuit 334 for subsequent use is connected with the first vice-side winding 325 for subsequent use, and the other end of the first output circuit 334 for subsequent use is connected with the first input end of OR circuit 333.The Same Name of Ends of the first vice-side winding 325 for subsequent use is arranged as shown in Figure 9 herein.First vice-side winding 325 for subsequent use and the first output circuit 334 for subsequent use be arranged so that the first former limit winding 321 or the first output circuit 331 go wrong time, isolated drive circuit of the present invention also can normally work.
Please refer to Figure 10, Figure 10 is the physical circuit figure of the 4th preferred embodiment of figure isolated drive circuit of the present invention.The difference of the present embodiment and the first preferred embodiment is, this isolation drive transformer also comprises the second vice-side winding 326 for subsequent use, this pulse drive signal change-over circuit also comprises the second output circuit 335 for subsequent use, this second output circuit 335 for subsequent use is for when the first pulse drive signal is high level, export the second high level signal, when the first pulse drive signal is low level, export the second low level signal.One end of second output circuit 335 for subsequent use is connected with the second vice-side winding 326 for subsequent use, and the other end of the second output circuit 335 for subsequent use is connected with the second input of OR circuit 333.The Same Name of Ends of the second vice-side winding 326 for subsequent use is arranged as shown in Figure 10 herein.Second vice-side winding 326 for subsequent use and the second output circuit 335 for subsequent use be arranged so that the second former limit winding 322 or the second output circuit 332 go wrong time, isolated drive circuit of the present invention also can normally work.
Please refer to Figure 11, Figure 11 is the physical circuit figure of the 5th preferred embodiment of isolated drive circuit of the present invention.The difference of the present embodiment and the first preferred embodiment is, this isolation drive transformer comprises the first vice-side winding 325 for subsequent use and the second vice-side winding 326 for subsequent use simultaneously.This pulse drive signal change-over circuit also comprises the first output circuit 334 for subsequent use and the second output circuit 335 for subsequent use.First output circuit 334 for subsequent use, for when the second pulse drive signal is high level, exports the first high level signal, when the second pulse drive signal is low level, exports the first low level signal; Second output circuit 335 for subsequent use, for when the first pulse drive signal is high level, exports the second high level signal, when the first pulse drive signal is low level, exports the second low level signal.One end of first output circuit 334 for subsequent use is connected with the first vice-side winding 325 for subsequent use, and the other end of the first output circuit 334 for subsequent use is connected with the first input end of OR circuit 333; One end of second output circuit 335 for subsequent use is connected with the second vice-side winding 326 for subsequent use, and the other end of the second output circuit 335 for subsequent use is connected with the second input of OR circuit 333.The Same Name of Ends of the first vice-side winding 325 for subsequent use and the second vice-side winding 326 for subsequent use is arranged as shown in figure 11 herein.The design of above-mentioned double spare vice-side winding and output circuit for subsequent use makes isolated drive circuit work of the present invention more stable.
Isolated drive circuit of the present invention can also comprise multiple pulse drive signal change-over circuit.Please refer to Figure 12, Figure 12 is the physical circuit figure of the 6th preferred embodiment of isolated drive circuit of the present invention.This isolated drive circuit includes two pulse drive signal change-over circuits, and the output signal of each pulse drive signal change-over circuit all can drive a power switch pipe.The specific works principle of each pulse drive signal change-over circuit is identical with the specific works principle of the pulse drive signal change-over circuit in the first preferred embodiment of above-mentioned isolated drive circuit, refers to the first preferred embodiment of above-mentioned isolated drive circuit.Therefore the present invention uses both-end pumping signal Drive and Control Circuit can drive multiple pulse drive signal change-over circuit simultaneously, and the change of the quantity of driving pulse drive singal change-over circuit does not limit the scope of the invention.
Isolated drive circuit of the present invention effectively avoids in traditional isolation drive transformer 32 isolation drive, wide duty ratio transmittance process, the driving voltage amplitude being transmitted to the vice-side winding of isolation drive transformer 32 reduces, and in the magnetic reset process avoiding isolation drive transformer 32, the resonance of capacitance and driving transformer magnetizing inductance causes the power switch pipe turned off to mislead.
In sum; although the present invention discloses as above with preferred embodiment; but above preferred embodiment is also not used to limit the present invention; those of ordinary skill in the art; without departing from the spirit and scope of the present invention; all can do various change and retouching, the scope that therefore protection scope of the present invention defines with claim is as the criterion.
Claims (9)
1. an isolated drive circuit, is characterized in that, comprising:
Isolation drive transformer, comprises former limit winding and vice-side winding;
Both-end pumping signal Drive and Control Circuit, for generation of the first pulse drive signal and the second pulse drive signal, described first pulse drive signal and described second pulse drive signal are inputted by described former limit winding; And
At least one pulse drive signal change-over circuit, for the output signal of described vice-side winding is converted to drive singal, this drive singal for driving corresponding power switch pipe,
The former limit winding switching of described both-end pumping signal Drive and Control Circuit and described isolation drive transformer, the vice-side winding of described isolation drive transformer is connected with described pulse drive signal change-over circuit;
Wherein said isolation drive transformer comprises the first vice-side winding and the second vice-side winding;
Described pulse drive signal change-over circuit comprises:
First output circuit, for when described second pulse drive signal is high level, exports the first high level signal, when described second pulse drive signal is low level, exports the first low level signal;
Second output circuit, for when described first pulse drive signal is high level, exports the second high level signal, when described first pulse drive signal is low level, exports the second low level signal; And
OR circuit, comprises first input end, the second input and output; For exporting described first low level signal when described first output circuit, simultaneously during described second described second low level signal of output circuit output, output low level drive singal; Otherwise export high level drive singal;
One end of described first output circuit is connected with described first vice-side winding, and the other end of described first output circuit is connected with the first input end of described OR circuit; One end of described second output circuit is connected with described second vice-side winding, and the other end of described second output circuit is connected with the second input of described OR circuit.
2. isolated drive circuit according to claim 1, it is characterized in that, described isolation drive transformer comprises the first former limit winding, described first pulse drive signal is inputted by one end of described first former limit winding, and described second pulse drive signal is inputted by the other end of described first former limit winding.
3. isolated drive circuit according to claim 1, it is characterized in that, described isolation drive transformer comprises the first former limit winding and the second former limit winding, described first pulse drive signal is inputted by described first former limit winding, and described second pulse drive signal is inputted by described second former limit winding.
4. the isolated drive circuit according to Claims 2 or 3, it is characterized in that, the frequency of described first pulse drive signal is identical with the frequency of described second pulse drive signal, the duty ratio of described first pulse drive signal is identical with the duty ratio of described second pulse drive signal, the high level time of described first pulse drive signal and the high level time of described second pulse drive signal successive, or the high level time of the high level time of described second pulse drive signal and described first pulse drive signal is successive.
5. isolated drive circuit according to claim 4, is characterized in that,
When the high level time of described first pulse drive signal and the high level time of described second pulse drive signal successive time, the time point that described second pulse drive signal is converted to high level by low level is converted to low level time point early than equaling described first pulse drive signal by high level;
When the high level time of described second pulse drive signal and the high level time of described first pulse drive signal successive time, the time point that described first pulse drive signal is converted to high level by low level is converted to low level time point early than equaling described second pulse drive signal by high level.
6. isolated drive circuit according to claim 1, is characterized in that, described first output circuit comprises:
First charge-discharge circuit, for shortening the time of the rising edge of described first high level signal, extends the time of the trailing edge of described first high level signal; And
First clamp circuit, for carrying out clamp to described first low level signal.
7. isolated drive circuit according to claim 1, is characterized in that, described second output circuit comprises:
Second charge-discharge circuit, for shortening the time of the rising edge of described second high level signal, extends the time of the trailing edge of described second high level signal; And
Second clamp circuit, for carrying out clamp to described second low level signal.
8. isolated drive circuit according to claim 1, is characterized in that,
Described isolation drive transformer also comprises the first vice-side winding for subsequent use and the second vice-side winding for subsequent use;
Described pulse drive signal change-over circuit also comprises:
First output circuit for subsequent use, for when described second pulse drive signal is high level, exports the first high level signal, when described second pulse drive signal is low level, exports the first low level signal; And
Second output circuit for subsequent use, for when described first pulse drive signal is high level, exports the second high level signal, when described first pulse drive signal is low level, exports the second low level signal;
One end of described first output circuit for subsequent use is connected with described first vice-side winding for subsequent use, and the other end of described first output circuit for subsequent use is connected with the first input end of described OR circuit; One end of described second output circuit for subsequent use is connected with described second vice-side winding for subsequent use, and the described other end of the second output circuit for subsequent use is connected with the second input of described OR circuit.
9. isolated drive circuit according to claim 1, it is characterized in that, described isolated drive circuit comprises the anti-D.C. magnetic biasing circuit of the DC magnetic bias phenomena for preventing described isolation drive transformer, and described anti-D.C. magnetic biasing circuit is connected with described both-end pumping signal Drive and Control Circuit and described isolation drive transformer respectively;
Described anti-D.C. magnetic biasing circuit comprises the first resistance and the first electric capacity, one end of described first resistance is connected with one end of described first electric capacity and described pulse drive signal change-over circuit respectively, and the other end of described first resistance is connected with the other end of described first electric capacity and described isolation drive transformer respectively.
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| CN201210364947.1A CN102916570B (en) | 2012-09-27 | 2012-09-27 | Isolated driving circuit |
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| CN201210364947.1A CN102916570B (en) | 2012-09-27 | 2012-09-27 | Isolated driving circuit |
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| CN102916570B true CN102916570B (en) | 2015-04-22 |
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| WO2014059620A1 (en) * | 2012-10-17 | 2014-04-24 | 深圳市安能能源技术有限公司 | Isolated driving circuit |
| CN103595226B (en) * | 2013-10-30 | 2016-03-16 | 安徽动力源科技有限公司 | Transformer isolation symmetrical complement drive circuit |
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| US7102898B2 (en) * | 2001-02-01 | 2006-09-05 | Di/Dt, Inc. | Isolated drive circuitry used in switch-mode power converters |
| CN101267156A (en) * | 2008-04-29 | 2008-09-17 | 哈尔滨工业大学深圳研究生院 | Separation driving circuit and control method with discharging channel |
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