CN104617751A - Audion drive circuit and drive method - Google Patents
Audion drive circuit and drive method Download PDFInfo
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- CN104617751A CN104617751A CN201510056120.8A CN201510056120A CN104617751A CN 104617751 A CN104617751 A CN 104617751A CN 201510056120 A CN201510056120 A CN 201510056120A CN 104617751 A CN104617751 A CN 104617751A
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- current
- electric current
- triode
- drive
- drive circuit
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses an audion drive circuit and drive method. The drive circuit comprises a current detection module, a constant-current source and a calculating device, wherein the input end of the current detection module is connected with the emitter of the audion and used for detecting the current change of the collector of the audion in real time through sampling and detecting voltage and generating second current according to the current of the collector; the constant-current source is connected with the input end of the calculating device for providing first current; the output end of the calculating device is connected with the base electrode of the audion through a first switch tube, and the calculating device calculates the drive current provided for the base electrode of the audion according to the first current and second current. The audion drive circuit and drive method can guarantee that the ratio of the collector current of the audion to the base electrode current would not surpass the normal range of a current amplification coefficient, the audion safety is guaranteed, and the conduction loss of the audion can be reduced.
Description
Technical field
The present invention relates to circuit engineering field, more particularly, relate to a kind of drive circuit and driving method of triode, be applied to triode source class and drive the LED realizing constant current output function to drive or in the Switching Power Supply such as charger.
Background technology
Power transistor is broadly divided into field-effect transistor, bipolar transistor and insulated gate transistor.At small-power power converter art, bipolar transistor is widely used with advantages such as good switching characteristic and cheap prices.
As shown in Figure 1, be the drive circuit of triode in prior art, as shown in Figure 2, be the waveform correlation figure of this transistor drive circuit in prior art, describe the operation principle of the drive circuit of lower triode of the prior art in detail below in conjunction with Fig. 1 and Fig. 2: V
rEFthe inductance peak current be used for when setting triode operation, as the output Ton=1 of logic processing module, M1 conducting, M2 turns off, and current Ib ase flows into the base stage of triode Q1 by M1, makes triode Q1 conducting, now Ic will linearly increase, simultaneously CS voltage (i.e. V
cS) also corresponding increase.As t1, Ton=0, current Ib ase turn off, and triode Q1 starts pre-shutoff, but the stored charge of base will make triode Q1 keep conducting within a certain period of time, so Ic continues to increase, until during t2, and V
cS=V
rEF, reach expection inductance peak current Ipk, now Toff=1, Ic=0, until PFM controls discharge time output triode being detected, triode Q1 opens again, and each cycle is by the switch motion before repetition afterwards.
The benefit of existing drive circuit is simple to operate, and circuit easily realizes, but this drive circuit has following shortcoming:
1) Ibase and Ipk does not contact, if Ibase is too little and Ipk design is too large, Vce may be caused very large not due to current amplification factor, as shown in Figure 3, if setting Ipk=500mA, and Ibase=34mA, then need very large Vce, thus conduction loss is too large, there is even the danger burning out triode Q1 (BJT).
2) because the size of Ibase goes design by Ipk, thus when Ic is less, go to drive triode Q1 with onesize Ibase, the waste of Ibase can be caused, thus lose efficiency.
Summary of the invention
The technical problem to be solved in the present invention is, for the shortcoming of prior art, provides a kind of drive circuit and driving method of triode.
The technical scheme that the present invention solves the problem there is provided a kind of drive circuit of triode, this drive circuit comprises electric current judge module, Logic control module, the first switching tube and second switch pipe, it is characterized in that, this drive circuit also comprises current detection module, constant-current source and calculation element, wherein, the input of described current detection module is connected with the emitter-base bandgap grading of triode, for the change of the collector current of real-time detection transistor, and produces the second electric current according to this collector current; Described constant-current source is connected with the input of described calculation element, for providing the first electric current; The output of described calculation element is connected with reference to ground with described second switch pipe through described first switching tube of series connection, and the output of described calculation element is connected with the base stage of triode through described first switching tube, described calculation element calculates according to described first electric current and described second galvanometer the drive current being supplied to transistor base.
In the drive circuit of above-mentioned triode, the relation formula of described second electric current and inductance peak current is Ib2=α Ipk, and wherein: Ib2 is described second electric current, Ipk is described inductance peak current, and α is proportionality coefficient, and the scope of α is 1/8 ~ 1/5.
In the drive circuit of above-mentioned triode, the relation formula of described drive current and described first electric current and described second electric current is Ibase=Ib1+Ib2, and wherein: Ibase is described drive current, Ib1 is described first electric current, and Ib2 is described second electric current.
In the drive circuit of above-mentioned triode, described electric current judge module comprises comparator; The start signal end of described Logic control module is connected with the output of described electric current judge module, and adopts pulse frequency modulated mode.
In the drive circuit of above-mentioned triode, described first switching tube and described second switch pipe are N-type metal-oxide-semiconductor.
Present invention also offers a kind of driving method of triode, be applied to the drive circuit comprising electric current judge module, Logic control module, the first switching tube, second switch pipe and constant-current source, it is characterized in that, the method comprises the following steps:
The change of S1, the in real time collector current of detection transistor, and produce the second electric current according to this collector current;
S2, constant-current source provide the first electric current;
S3, calculate according to described first electric current and described second galvanometer the drive current being supplied to transistor base.
In the driving method of above-mentioned triode, in described step S1, the relation formula of described second electric current and inductance peak current is Ib2=α Ipk, wherein: Ib2 is described second electric current, Ipk is described inductance peak current, and α is proportionality coefficient, and the scope of α is 1/8 ~ 1/5.
In the driving method of above-mentioned triode, in described step S3, the relation formula of described drive current and described first electric current and described second electric current is Ibase=Ib1+Ib2, wherein: Ibase is described drive current, Ib1 is described first electric current, and Ib2 is described second electric current.
Transistor drive circuit of the present invention and the collector current Ic of driving method to triode detect in real time, and the drive current Ibase being supplied to transistor base is constantly adjusted according to the value of collector current Ic, go to drive with larger drive current Ibase when collector current Ic is larger, then drive with less drive current Ibase when collector current Ic is less, thus can not waste drive current Ibase, thus obtain optimum driving effect.Simultaneously, set up contacting between inductance peak current Ipk and drive current Ibase, guarantee that the collector current of triode can not exceed the normal range (NR) of current amplification factor with the ratio of base current, ensure the safety of triode, the conduction loss of triode can be reduced simultaneously.
Accompanying drawing explanation
Fig. 1 is the drive circuit of triode in prior art.
Fig. 2 is the waveform correlation figure of this transistor drive circuit in prior art.
Fig. 3 is the output characteristic curve (I-V characteristic curve) of triode.
Fig. 4 is the drive circuit figure of the triode of the embodiment of the present invention.
Fig. 5 is the key waveforms of the drive circuit of triode in Fig. 4.
Fig. 6 is the flow chart of the driving method of the triode of the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The principle of lower drive circuit of the present invention and driving method is described: as shown in Figure 3 below in conjunction with figure, it is the output characteristic curve (I-V characteristic curve) of triode, as can be seen from the figure, collector current can be divided into two kinds of situations, when being smaller value and higher value, and then the conduction loss problem of triode is discussed.
It should be noted that, when analyzing the operation principle of triode, in collector current Ic and figure, Ice is approximately equalised, and those skilled in the art all know the implication of Ice, do not repeat them here, and in the present invention, even collector current Ic sets forth.
When collector current Ic is smaller value, i.e. collector current Ic<150mA, now, the I-V characteristic curve that not identical drive current Ibase is corresponding almost overlaps, such as, the I-V curve of Ibase=20mA and Ibase=70mA, can find out, when collector current Ic is identical, the voltage Vce between base stage with emitter-base bandgap grading is identical, therefore, the drive current Ibase of smaller value can be adopted to be supplied to the base stage of triode, make triode ON, therefore, reduce the loss of the drive current driving triode ON;
When collector current Ic is higher value, drive current Ibase is comparatively large on the impact of the voltage Vce between base stage and emitter-base bandgap grading, now, adopt the drive current of higher value to be supplied to the base stage of triode, make triode ON, such as, as Ice=400mA, if Ibase=34mA, then Vce=1.4V; If Ibase=56mA, then Vce=0.6V, can find out the base stage adopting the drive current of higher value to be supplied to triode, make triode ON, the conduction loss of triode obviously declines.
According to above-mentioned analysis, as shown in Figure 4, be the drive circuit figure of the triode of the embodiment of the present invention, in the present embodiment, NPN type triode Q1 selected by triode.This drive circuit comprises electric current judge module 401, Logic control module 402, current detection module 403, constant-current source 404, calculation element 405, first switching tube M1 and second switch pipe M2; Wherein:
Electric current judge module 401 comprises comparator C, its in the same way input the detection voltage V that provides of current detection module 403 is provided
cS, reverse input end connects reference voltage V
rEF, wherein, reference voltage V
rEFfor internal reference voltage, in the present embodiment, the combination that electric current judge module 401 can also adopt multiple comparator to carry out, such as, comparator C1 and comparator C2, wherein, its in the same way input the detection voltage V that provides of current detection module 403 is provided
cS, the reverse input end of comparator C1 connects a reference voltage, and the reverse input end of comparator C2 connects another reference voltage.
The start signal end of Logic control module 402 is connected with the output of electric current judge module 401, Logic control module 402 adopts pulse frequency modulated mode (PFM), its first output Ton is connected with the grid of the first switching tube M1, for controlling the turn-on and turn-off of the first switching tube M1; The grid of the second output Toff and second switch pipe M2, for controlling the turn-on and turn-off of second switch pipe M2.
The input of current detection module 403 is connected with the emitter-base bandgap grading of triode Q1, by detecting voltage V
cS, for the change of the collector current Ic of real-time detection transistor, and produce the second current Ib 2 according to collector current Ic, wherein, the second current Ib 2 is as follows with the relation of inductance peak current Ipk:
Ib2＝αIpk
Wherein, α is proportionality coefficient, and its scope is 1/8 ~ 1/5, when design circuit, as long as α value is within its scope, then the ratio of inductance peak current Ipk and ideal base drive current Ibase can not exceed the normal range (NR) of the current amplification factor of triode Q1, thus guarantees the safety of triode Q1.
Constant-current source 404 is connected with the input of calculation element 405, for providing the first current Ib 1.
The output of calculation element 405 is connected with reference to ground with second switch pipe M2 through the first switching tube M1 of series connection, and the output of calculation element 405 is connected with the base stage of triode Q1 through the first switching tube M1; Calculation element 405 calculates according to the first current Ib 1 and the second current Ib 2 the drive current Ibase being supplied to triode Q1 base stage, and now, the relation of drive current Ibase and the first current Ib 1 and the second current Ib 2 is as follows:
Ibase＝Ib1+Ib2＝Ib1+αIpk。
In the present embodiment, the first switching tube M1 and second switch pipe M2 is N-type metal-oxide-semiconductor, but is not limited thereto, and can also be P type metal-oxide-semiconductor or other switching tubes.
As shown in Figure 5, it is the key waveforms of the drive circuit of the triode in Fig. 4, wherein, the waveform of the first output Ton output of waveform Ton presentation logic processing module 402, Ibase waveform represents the drive current that calculation element 405 calculates, Toff waveform represents the waveform that the second output Toff of logic processing module 402 exports, and Ice waveform represents the collector current of triode Q1, and Vce waveform represents the voltage between the collector electrode of triode Q1 and emitter-base bandgap grading.As can be seen from the figure, when the t0 moment, collector current Ic is less, and drive current Ibase is less, namely for driving the utilance of triode higher; When t0-t3, t3-t1 and t1-t2, along with collector current Ic increase time, drive current Ibase also increases thereupon, now, the equivalent conducting resistance of triode Q1 reduces, and the voltage Vce therefore between the collector electrode of triode Q1 and emitter-base bandgap grading no longer linearly increases along with collector current Ic increases, but is similar to constant, therefore, the conduction loss of triode diminishes.
The driving method of lower triode is described below in conjunction with Fig. 4 and Fig. 5, and as shown in Figure 6, be the flow chart of the driving method of the triode of the embodiment of the present invention, this driving method comprises the following steps:
The change of S601, in real time the collector current Ic of detection transistor, and produce the second current Ib 2 according to collector current Ic;
In this step, second current Ib 2 is Ib2=α Ipk with the pass of inductance peak current Ipk, wherein, α is proportionality coefficient, when design circuit, α is proportionality coefficient, its scope is 1/8 ~ 1/5, when design circuit, as long as α value is within its scope, then the current amplification factor of triode Q1 can not exceed normal range (NR), and inductance peak current Ipk is by reference to voltage V
rEFset.
S602, constant-current source provide the first current Ib 1;
S603, calculation element calculate according to the first current Ib 1 and the second current Ib 2 the drive current Ibase being supplied to triode Q1 base stage.
In this step, the relation of drive current Ibase and the first current Ib 1 and the second current Ib 2 is as follows:
Ibase＝Ib1+Ib2＝Ib1+αIpk。
To sum up analyze, transistor drive circuit of the present invention and the collector current Ic of driving method to triode detect in real time, and the drive current Ibase being supplied to transistor base is constantly adjusted according to the value of collector current Ic, go to drive with larger drive current Ibase when collector current Ic is larger, then drive with less drive current Ibase when collector current Ic is less, thus can not waste drive current Ibase, thus obtain optimum driving effect.Simultaneously, set up contacting between inductance peak current Ipk and drive current Ibase, guarantee that the collector current of triode can not exceed the normal range (NR) of current amplification factor with the ratio of base current, ensure the safety of triode, the conduction loss of triode can be reduced simultaneously.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (8)
1. the drive circuit of a triode, this drive circuit comprises electric current judge module (401), Logic control module (402), the first switching tube (M1) and second switch pipe (M2), it is characterized in that, this drive circuit also comprises current detection module (403), constant-current source (404) and calculation element (405), wherein, the input of described current detection module (403) is connected with the emitter-base bandgap grading of triode, for the change of the collector current of real-time detection transistor, and produce the second electric current according to this collector current; Described constant-current source (404) is connected with the input of described calculation element (405), for providing the first electric current; The output of described calculation element (405) is connected with reference to ground with described second switch pipe (M2) through described first switching tube (M1) of series connection, and the output of described calculation element (405) is connected with the base stage of triode through described first switching tube (M1), described calculation element (405) calculates according to described first electric current and described second galvanometer the drive current being supplied to transistor base.
2. according to the drive circuit of the triode described in claim 1, it is characterized in that, the relation formula of described second electric current and inductance peak current is Ib2=α Ipk, wherein: Ib2 is described second electric current, Ipk is described inductance peak current, α is proportionality coefficient, and the scope of α is 1/8 ~ 1/5.
3. according to the drive circuit of the triode described in claim 1, it is characterized in that, the relation formula of described drive current and described first electric current and described second electric current is Ibase=Ib1+Ib2, wherein: Ibase is described drive current, Ib1 is described first electric current, and Ib2 is described second electric current.
4. according to the drive circuit of the triode described in claim 1, it is characterized in that, described electric current judge module (401) comprises comparator; The start signal end of described Logic control module (402) is connected with the output of described electric current judge module (401), and adopts pulse frequency modulated mode.
5. the drive circuit of the triode according to any one of claim 1-4, is characterized in that, described first switching tube (M1) and described second switch pipe (M2) are N-type metal-oxide-semiconductor.
6. the driving method of a triode, be applied to the drive circuit comprising electric current judge module (401), Logic control module (402), the first switching tube (M1), second switch pipe (M2) and constant-current source (404), it is characterized in that, the method comprises the following steps:
The change of S1, the in real time collector current of detection transistor, and produce the second electric current according to this collector current;
S2, constant-current source provide the first electric current;
S3, calculate according to described first electric current and described second galvanometer the drive current being supplied to transistor base.
7. according to the driving method of the triode described in claim 6, it is characterized in that, in described step S1, the relation formula of described second electric current and inductance peak current is Ib2=α Ipk, wherein: Ib2 is described second electric current, Ipk is described inductance peak current, and α is proportionality coefficient, and the scope of α is 1/8 ~ 1/5.
8. according to the driving method of the triode described in claim 6, it is characterized in that, in described step S3, the relation formula of described drive current and described first electric current and described second electric current is Ibase=Ib1+Ib2, wherein: Ibase is described drive current, Ib1 is described first electric current, and Ib2 is described second electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510056120.8A CN104617751A (en) | 2015-02-03 | 2015-02-03 | Audion drive circuit and drive method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510056120.8A CN104617751A (en) | 2015-02-03 | 2015-02-03 | Audion drive circuit and drive method |
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| CN201510056120.8A Pending CN104617751A (en) | 2015-02-03 | 2015-02-03 | Audion drive circuit and drive method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110138220A (en) * | 2018-02-08 | 2019-08-16 | 比亚迪股份有限公司 | A kind of power supply and its switching power circuit |
| CN110138221A (en) * | 2018-02-08 | 2019-08-16 | 比亚迪股份有限公司 | A kind of power supply and its switching power circuit |
| CN113381590A (en) * | 2020-03-09 | 2021-09-10 | 辉芒微电子（深圳）有限公司 | Drive circuit containing multistage NPN transistor |
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| CN110138221A (en) * | 2018-02-08 | 2019-08-16 | 比亚迪股份有限公司 | A kind of power supply and its switching power circuit |
| CN110138221B (en) * | 2018-02-08 | 2020-12-25 | 比亚迪股份有限公司 | Power supply and switching power supply circuit thereof |
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