CN206759310U - A kind of controllable BJT voltage-stablizers of precision - Google Patents
A kind of controllable BJT voltage-stablizers of precision Download PDFInfo
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- CN206759310U CN206759310U CN201720385406.5U CN201720385406U CN206759310U CN 206759310 U CN206759310 U CN 206759310U CN 201720385406 U CN201720385406 U CN 201720385406U CN 206759310 U CN206759310 U CN 206759310U
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- stablizers
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Abstract
The utility model discloses a kind of controllable BJT voltage-stablizers of precision, including backfeed loop, Miller's compensating circuit and Darlington transistor group；The backfeed loop, the output end of the difference amplifier and the input of the band gap reference are connected, the voltage of accurate controllable BJT voltage-stablizer inputs described in feedback regulation；The Miller's compensating circuit, it is connected between output end and the supply voltage of the difference amplifier；The Darlington transistor group, is connected with the output end of difference amplifier, as the output stage of accurate controllable BJT voltage-stablizers, amplifies and divides to walk portion voltage.The utility model proposes a kind of accurate controllable BJT voltage-stablizers, voltage precision is controllable, easy to use, due to the voltage of accurate control signal, analogue layout teacher can be facilitated to obtain temperature independent and desirable amount voltage by external resistance matches, regulation in design.
Description
Technical field
The technical field of voltage-stablizer is the utility model is related to, specifically, the controllable BJT voltage stabilizings of especially a kind of precision
Device.
Background technology
Various portable electronic products, for example, notebook computer, mobile phone, camera, Medical Instruments and tester etc.
Fast development, promote the development of the novel voltage stabilizing integrated circuit of these suitable products.But in the integrated electricity of simulation of reality
The voltage of voltage-stablizer is constant under the situation phase that circuit structure is fixed in the design of road, and can sometimes give needs accurate voltage stabilizing
Designers make troubles.
Utility model content
In order to solve problem of the prior art, the utility model embodiment provides a kind of controllable BJT voltage-stablizers of precision.
The technical scheme is as follows：
On the one hand, there is provided a kind of controllable BJT voltage-stablizers of precision, including band gap reference and difference amplifier, it is described
Band gap reference is the input stage of the controllable BJT voltage-stablizers of the precision；The difference amplifier, is connected with band gap reference,
Amplify input voltage；The controllable BJT voltage-stablizers of the precision also include backfeed loop, Miller's compensating circuit and Darlington transistor
Group；
The backfeed loop, the output end of the difference amplifier and the input of the band gap reference are connected, fed back
Adjust the voltage of the controllable BJT voltage-stablizer inputs of the precision；
The Miller's compensating circuit, it is connected between output end and the supply voltage of the difference amplifier；
The Darlington transistor group, is connected with the output end of difference amplifier, as the defeated of accurate controllable BJT voltage-stablizers
Go out level, amplify the voltage of the difference amplifier output, and divide to walk the portion voltage of the difference amplifier output.
Alternatively, the band gap reference includes the first triode, and first triode is the band gap reference
Input；The difference amplifier includes the 7th triode and the 8th triode；7th triode and the 8th triode
Collector current is controlled by the band gap reference.
Alternatively, the backfeed loop includes the 9th triode, and the 9th triode is by connecting the one or three pole
The colelctor electrode of the base stage of pipe and the 8th triode, the input of band gap reference is connected with the output end of difference amplifier
Together, the structure of negative-feedback is formed, first transistor base is controlled by the voltage of the 8th transistor collector
Voltage.
Alternatively, the Miller's compensating circuit includes the 9th resistance and the second electric capacity, the 9th resistance and described second
It is connected to after electric capacity series connection between output end and the supply voltage of the difference amplifier.
Alternatively, the Darlington transistor group includes the tenth triode and the 11st triode；The collection of tenth triode
Electrode connects with the colelctor electrode of the 11st triode, and the emitter stage of the tenth triode is with the 11st triode
Base stage connects；The base stage of the Darlington transistor group is the base stage of the tenth triode, launches extremely described 11st triode
Emitter stage；The base stage of tenth triode connects the output end of the difference amplifier.
Alternatively, the controllable BJT voltage-stablizers of the precision also include the first voltage-regulator diode and the second voltage-regulator diode；Institute
The negative pole for stating the first voltage-regulator diode connects the colelctor electrode of the 8th triode, and positive pole connects the transmitting of the 8th triode
Pole；
The negative pole of second voltage-regulator diode connects the colelctor electrode of the 11st triode, positive pole connection the described tenth
The emitter stage of one triode.
Alternatively, the band gap reference provides the reference voltage of the unrelated stabilization of temperature for rear class.
Alternatively, the difference amplifier uses differential pair structure；7th triode and the 8th triode are differential pair.
Alternatively, the difference amplifier uses the form of double-width grinding.
Alternatively, the backfeed loop uses npn triode.
The beneficial effect brought of technical scheme that the utility model embodiment provides is：
Voltage precision is controllable, easy to use, due to the voltage of accurate control signal, Analogous Integrated Electronic Circuits can be facilitated to set
Count teacher and temperature independent and desirable amount voltage is obtained by external resistance matches, regulation in design.
Brief description of the drawings
, below will be to needed for embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
The accompanying drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some realities of the present utility model
Example is applied, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is a kind of module diagram of the controllable BJT voltage-stablizers of precision of the utility model embodiment；
Fig. 2 is a kind of circuit diagram of the controllable BJT voltage-stablizers of precision of the utility model embodiment；
Fig. 3 is a kind of controllable BJT voltage-stablizers reference input voltage of precision of the utility model embodiment and environment temperature
Relation curve.
Embodiment
It is new to this practicality below in conjunction with accompanying drawing to make the purpose of this utility model, technical scheme and advantage clearer
Type embodiment is described in further detail.
The utility model provides a kind of controllable BJT voltage-stablizers of precision, referring to Fig. 1, the controllable BJT voltage stabilizings of the precision
Device 10 includes：
Band gap reference 100, difference amplifier 200, backfeed loop 300, Miller's compensating circuit 400, Darlington transistor group
500；
The band gap reference 100 is the input stage of the controllable BJT voltage-stablizers 10 of the precision；
The difference amplifier 200, is connected with band gap reference 100, amplifies input voltage；
The backfeed loop 300, connect the output end of difference amplifier 200 and the input of band gap reference 100, feedback
The voltage of the controllable input of BJT voltage-stablizers 10 of adjustment precision；
The Miller's compensating circuit 400, it is connected between output end and the supply voltage of the difference amplifier 200；Protect
Protection circuit remains at normal work under negative-feedback state；
The Darlington transistor group 500, is connected with the output end of difference amplifier 200, as accurate controllable BJT voltage stabilizings
The output stage of device 10, amplify the voltage that the difference amplifier 200 exports, and the portion for dividing to walk the difference amplifier 200 to export
Component voltage.
Alternatively, the band gap reference 100 provides the reference voltage of the unrelated stabilization of temperature for rear class.
Specifically, the band gap base source 100 is based on and PTAT (PTAT using a kind of:proportional
To absolute temperature) current-type band gap benchmark.
Specifically, the circuit output reference voltage of band gap reference 100 is：
Because BJT base emitter voltage has negative temperature coefficient, and there is positive temperature coefficient, regulation resistance it is big
I offsets Positive and Negative Coefficient Temperature, so as to obtain the reference voltage of a constant temperature.
Alternatively, the difference amplifier 200 uses the form of double-width grinding, and the difference amplifier 200 uses difference
To structure.
The drift of amplifier quiescent operating point when specifically, in order to reduce change in gain, difference amplifier 200 use pnp
Type BJT pipes optimize the noiseproof feature of amplifier as inputting.
Alternatively, the backfeed loop 300 is loaded using npn triode as backfeed loop.
Specifically, negative-feedback time is formed by connecting the form of the output of difference amplifier 200 and the input of band gap reference 100
Road, effectively suppress the voltage of BJT voltage-stablizer input nodes using the voltage of output node, reach the purpose of voltage stabilizing.
Alternatively, the Miller's compensating circuit 400 is loaded using bulky capacitor, is connected to power supply and difference amplifier 200 is defeated
Between going out, the stability of system is improved.
Specifically, high output impedance and big load capacitance can effectively make pole frequency caused by amplifier out
With good phase margin.
Alternatively, the Darlington group pipe 500 is using triode and the structure of resistance cascade.
Specifically, the method connected using npn+npn same polarity, multiplication factor are multiplying for two triode multiplication factors
Product.
Alternatively, the controllable BJT voltage-stabiliser tubes of the precision also include voltage-regulator diode, and the voltage-regulator diode is as voltage
Reference element.
Specifically, voltage-regulator diode utilizes pn-junction reverse breakdown state, and its electric current can change and voltage in very large range
The phenomenon being basically unchanged reaches the purpose of burning voltage.
In the present embodiment, a kind of circuit diagram of the controllable BJT voltage-stablizers of precision is additionally provided, referring to Fig. 2, band gap reference
100 rear classes provide the reference voltage of the unrelated stabilization of temperature；Difference amplifier 200 amplifies input voltage；Backfeed loop 300 adjusts essence
The voltage of close controllable BJT voltage-stablizers input；The protection circuit of Miller's compensating circuit 400 remains at normal under negative-feedback state
Work；Darlington transistor group 500 is amplified and divides to walk a part of voltage；Voltage-regulator diode ensures BJT pipe normal works.
In the present embodiment, the band gap reference 100 is the band including the first triode M1, the first triode M1
The input of gap a reference source 100；The difference amplifier 200 includes the 7th triode M7 and the 8th triode M8；Described 7th
Control of triode M7 and the 8th triode the M8 collector current by the band gap reference 100；7th triode M7,
Eight triode M8 differential pairs.
Specifically, inputs of the first triode M1 as band gap reference 100 in band gap reference 100, and voltage stabilizing
The input of device, because BJT base emitter voltage has negative temperature coefficient, and there is positive temperature coefficient, regulation resistance R2
Positive and Negative Coefficient Temperature is offset with R3 big I, so as to obtain the reference voltage of a constant temperature.
Specifically, the backfeed loop 300 includes the 9th triode M9, and the 9th triode M9 is by connecting described
The colelctor electrode of one triode M1 base stage and the 8th triode M8, by the input and differential amplification of band gap reference 100
The output end of device 200 links together, and forms the structure of negative-feedback, is controlled by the voltage of the 8th triode M8 colelctor electrodes
The voltage of the first triode M1 base stages, so as to effectively control the voltage of voltage-stablizer input node, backfeed loop is voltage stabilizing
Device controls to adjust module.
Specifically, the Miller's compensating circuit 400 includes the 9th resistance R9 and the second electric capacity C2, the 9th resistance R9 and
It is connected to after the second electric capacity C2 series connection between output end and the supply voltage of the difference amplifier 200, protection circuit begins
Normal work under negative-feedback state is maintained at eventually.
The controllable BJT voltage-stablizers of the precision also include Darlington transistor group 500, are the controllable BJT voltage-stablizers of the precision
Output stage, Darlington transistor group 500 using using npn+npn types triode cascade structure.
The Darlington transistor group 500 includes the tenth triode M10 and the 11st triode M11；The tenth triode M10
Colelctor electrode be connected with the colelctor electrode of the 11st triode M11, the emitter stage of the tenth triode M10 is with the described tenth
One triode M11 base stage connection；The base stage of the Darlington transistor group 3 is the base stage of the tenth triode M10, and transmitting is extremely
The emitter stage of the 11st triode M11；The base stage of the tenth triode M10 connects the defeated of the difference amplifier 200
Go out end.Multiplication factor is the product of the tenth triode M10 and the 11st triode M11 multiplication factors, and in the tenth triode
Divide to walk the voltage of a part of output node of difference amplifier 200 when M10 is turned on.Meanwhile the tenth triode M10 and the 11st
Pole pipe M11 is connected to the tenth divider resistance R10 and the 11st divider resistance R11.
Alternatively, voltage-regulator diode includes the first voltage-regulator diode D1 and the second voltage-regulator diode D2；First voltage stabilizing
Diode D1 negative pole connects the colelctor electrode of the 8th triode M8, and positive pole connects the emitter stage of the 8th triode M8,
Stabilize the voltage between the node of the 8th triode M8 collector and emitters two；Similarly, the second voltage-regulator diode D2's is negative
Pole connects the colelctor electrode of the 11st triode M11, and positive pole connects the emitter stage of the 11st triode M11, and second is steady
Pressure diode D2 stablizes the voltage between the node of the 11st triode M11 collector and emitters two, ensures that BJT manages normal work
Make.
In the present embodiment, accurate controllable BJT voltage-stablizers reference input voltage and environment temperature relation curve are additionally provided,
Referring to Fig. 3, obtaining the condition of work of the curve is：Operating supply voltage is more than 2.5V, using 0.5um BCD techniques.It can be seen that electricity
When road is operated in -40~80 DEG C, input node voltage stabilization is and temperature independent in 2.5V or so.
In summary, the beneficial effect brought of technical scheme that the utility model embodiment provides is：
Voltage precision is controllable, easy to use, due to the voltage of accurate control signal, Analogous Integrated Electronic Circuits can be facilitated to set
Count teacher and temperature independent and desirable amount voltage is obtained by external resistance matches, regulation in design.
Embodiments described above circuit is only schematical, wherein the part description of the separation can be single
In the presence of that can also be existing for unit form, some or all of module therein can be selected to realize according to the actual needs
The purpose of this embodiment scheme.The ordinary designer of this area is not in the case where paying performing creative labour, you can to understand
And implement, it can be realized according to actual conditions are suitably modified when with reference to the present embodiment.
Described by embodiment more than, the designer of this area can be understood that each embodiment institute
The software and technology library needed.Based on such understanding, above-mentioned technical proposal substantially contributes to prior art in other words
Part can be embodied in the form of actual chips circuit.
Preferred embodiment of the present utility model is these are only, it is all in the utility model not to limit the utility model
Spirit and principle within, any modification, equivalent substitution and improvements made etc., should be included in protection model of the present utility model
Within enclosing.
Claims (10)
1. a kind of controllable BJT voltage-stablizers of precision, including band gap reference and difference amplifier, the band gap reference are described
The input stage of accurate controllable BJT voltage-stablizers；The difference amplifier, it is connected with the band gap reference, amplifies input voltage；
Characterized in that, the controllable BJT voltage-stablizers of the precision also include backfeed loop, Miller's compensating circuit and Darlington transistor group；
The backfeed loop, connect the output end of the difference amplifier and the input of the band gap reference, feedback regulation
The voltage of the controllable BJT voltage-stablizer inputs of the precision；
The Miller's compensating circuit, it is connected between output end and the supply voltage of the difference amplifier；
The Darlington transistor group, is connected with the output end of difference amplifier, the output as accurate controllable BJT voltage-stablizers
Level, amplifies the voltage of the difference amplifier output, and divides to walk the portion voltage of the difference amplifier output.
2. accurate controllable BJT voltage-stablizers as claimed in claim 1, it is characterised in that the band gap reference includes first
Triode, first triode are the input of the band gap reference；The difference amplifier include the 7th triode and
8th triode；The collector current of 7th triode and the 8th triode is controlled by the band gap reference.
3. accurate controllable BJT voltage-stablizers as claimed in claim 2, it is characterised in that the backfeed loop includes the 9th 3
Pole pipe, the 9th triode is by connecting the base stage of first triode and the colelctor electrode of the 8th triode, by band
The input of gap a reference source and the output end of difference amplifier link together, and form the structure of negative-feedback, pass through the described 8th
The voltage of transistor collector controls the voltage of first transistor base.
4. controllable BJT voltage-stablizers as claimed in claim 3 accurate, it is characterised in that the Miller's compensating circuit includes the
The output end of the difference amplifier is connected to after nine resistance and the second electric capacity, the 9th resistance and second electric capacity series connection
Between supply voltage.
5. accurate controllable BJT voltage-stablizers as claimed in claim 4, it is characterised in that the Darlington transistor group includes the tenth
Triode and the 11st triode；The colelctor electrode of tenth triode connects with the colelctor electrode of the 11st triode, institute
The emitter stage for stating the tenth triode connects with the base stage of the 11st triode；The base stage of the Darlington transistor group is described the
The base stage of ten triodes, launch the emitter stage of extremely described 11st triode；Described in the base stage connection of tenth triode
The output end of difference amplifier.
6. controllable BJT voltage-stablizers as claimed in claim 5 accurate, it is characterised in that also including the first voltage-regulator diode and
Second voltage-regulator diode；The negative pole of first voltage-regulator diode connects the colelctor electrode of the 8th triode, positive pole connection institute
State the emitter stage of the 8th triode；
The negative pole of second voltage-regulator diode connects the colelctor electrode of the 11st triode, positive pole connection the described 11st
The emitter stage of pole pipe.
7. accurate controllable BJT voltage-stablizers as claimed in claim 6, it is characterised in that the band gap reference carries for rear class
For the reference voltage of the unrelated stabilization of temperature.
8. accurate controllable BJT voltage-stablizers as claimed in claim 7, it is characterised in that the difference amplifier uses difference
To structure；7th triode and the 8th triode are differential pair.
9. accurate controllable BJT voltage-stablizers as claimed in claim 8, it is characterised in that the difference amplifier uses both-end
The form of input.
10. accurate controllable BJT voltage-stablizers as claimed in claim 9, it is characterised in that the backfeed loop uses npn
Triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720385406.5U CN206759310U (en) | 2017-04-13 | 2017-04-13 | A kind of controllable BJT voltage-stablizers of precision |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720385406.5U CN206759310U (en) | 2017-04-13 | 2017-04-13 | A kind of controllable BJT voltage-stablizers of precision |
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| CN201720385406.5U Expired - Fee Related CN206759310U (en) | 2017-04-13 | 2017-04-13 | A kind of controllable BJT voltage-stablizers of precision |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108345339A (en) * | 2018-03-09 | 2018-07-31 | 苏州工业园区海沃科技有限公司 | A kind of high-power constant-flow driver based on NEW TYPE OF COMPOSITE Darlington circuit topological structure |
| CN113541462A (en) * | 2020-04-20 | 2021-10-22 | 西安鼎芯微电子有限公司 | High-voltage starting circuit and switching power supply circuit |
-
2017
- 2017-04-13 CN CN201720385406.5U patent/CN206759310U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108345339A (en) * | 2018-03-09 | 2018-07-31 | 苏州工业园区海沃科技有限公司 | A kind of high-power constant-flow driver based on NEW TYPE OF COMPOSITE Darlington circuit topological structure |
| CN113541462A (en) * | 2020-04-20 | 2021-10-22 | 西安鼎芯微电子有限公司 | High-voltage starting circuit and switching power supply circuit |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171215 Termination date: 20200413 |
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| CF01 | Termination of patent right due to non-payment of annual fee |