CN107589772A - A kind of current source circuit - Google Patents
A kind of current source circuit Download PDFInfo
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- CN107589772A CN107589772A CN201710744906.8A CN201710744906A CN107589772A CN 107589772 A CN107589772 A CN 107589772A CN 201710744906 A CN201710744906 A CN 201710744906A CN 107589772 A CN107589772 A CN 107589772A
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- transistor
- current source
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- source circuit
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Abstract
The invention provides a kind of current source circuit.The current source circuit, including：Amplifier, the first transistor, second transistor, first resistor, wherein, amplifier, its positive input is input end of analog signal, its reverse input end is voltage signal feedback end, the current output terminal of the reverse input end and the first transistor connects, and the input of its output end and the first transistor connects；The current output terminal of the first transistor is grounded by first resistor；The input of second transistor is pulse signal input terminal, and the reverse input end of its output end and amplifier connects.By the current source circuit of the present invention, it is capable of the output of instantaneous trip current source, reaches the purpose that pulse exports；Also, because analog input end can work without chopper circuit, current source circuit under extremely low input voltage, so that the current source circuit obtains the pulse current output of wide scope in the case where sampling resistor is constant.
Description
Technical field
The present invention relates to current source technology field, in particular to a kind of current source circuit.
Background technology
Current source circuit is that one kind in electrical application technology commonly uses basic circuit, and such circuit can export constant electricity
Stream, output current do not change with the change of load within the specific limits.
There are a variety of circuits to realize current source function, wherein, there is a kind of current source to be called voltage-controlled current source, this current source
The output current of circuit can be controlled by its input voltage, i.e. input voltage and output current is linearly proportional.It is voltage-controlled
Current source can export the current waveform of consecutive variations under the control of digital analog converter (DAC) or other analog signals, when need
When exporting the current impulse of width-adjustable, it will usually by the control after analog signal (modulated signal) progress copped wave as current source
Input, this mode has a problem that, when input signal is very faint (such as less than 100mV), general copped wave electricity
Road can not work, and this means that the input dynamic range of the voltage-controlled pulse current source circuit can not cover small and weak signal.
Therefore, how a kind of voltage-controlled pulse current source circuit of wide input range (extremely low voltage) is provided, is turned at present urgently
Technical problem to be solved.
The content of the invention
It is contemplated that at least solves one of technical problem present in prior art or correlation technique.
Therefore, it is an aspect of the invention to propose a kind of current source circuit.
In view of this, the present invention proposes a kind of current source circuit, including：Amplifier, the first transistor, the second crystal
Pipe, first resistor, wherein, amplifier, its positive input is input end of analog signal, and its reverse input end is that voltage signal is anti-
The current output terminal of feedback end, the reverse input end and the first transistor connects, and the input of its output end and the first transistor connects
Connect；The current output terminal of the first transistor is grounded by first resistor；The input of second transistor is pulse signal input terminal,
The reverse input end of its output end and amplifier connects.
According to the current source circuit of the present invention, it is made up of amplifier, first resistor, the first transistor and second transistor,
Wherein, first resistor is sampling resistor.The in-phase input end of amplifier is input end of analog signal, and its inverting input is control
Feedback end；When there is analog signal input, there is provided one control voltage to amplifier in-phase end when, amplifier exports a driving
Voltage drives the input of the first transistor, and output current is through overload (such as resistance) and first resistor after the first transistor conducting
It is back to ground, output current flows through the end of oppisite phase for producing after first resistor and amplifier being fed back to after a feedback voltage, due to fortune
The empty short, resolution of input is put, feedback signal no longer raises after being finally reached analog input signal voltage, and electric current reaches stable,
So as to realize voltage-controlled constant current output.Pulse signal is directly inputted to the anti-phase saturation end of amplifier by second transistor.Work as pulse
When signal input is high level, second transistor cut-off, the normal output current of current source；When pulse signal input is low level
When, second transistor is converted to conducting by ending, and the end of oppisite phase of amplifier is forced to draw high, therefore amplifier ends, first
The input of transistor ends after losing driving voltage, output current shut-off.The current source circuit of the present invention, utilizes voltage controlled current
The anti-phase saturated characteristic of amplifier in source, the output of instantaneous trip current source, reach the purpose that pulse exports；Simultaneously as current source
Analog input end can work without chopper circuit, current source circuit under extremely low input voltage, can reach 10uV, this characteristic
The current source circuit is set to obtain the pulse current output of wide scope in the case where sampling resistor is constant.
In addition, according to the above-mentioned current source circuit of the present invention, there can also be technical characteristic additional as follows：
In the above-mentioned technical solutions, it is preferable that the current source circuit also includes：Second resistance, second resistance, which is connected to, puts
Greatly between the output end of device and the input of the first transistor, for reducing the switching speed of the first transistor.
In the technical scheme, the current source circuit also includes second resistance, and second resistance is used to reduce the first transistor
Switching speed.When there is analog signal input, there is provided one control voltage to amplifier in-phase end when, amplifier exports one
Driving voltage drives the input of the first transistor after second resistance, turns on the first transistor, avoids the first transistor
Moment generation current over pulse is being opened, and is causing first crystal tube failure, so as to effectively lift the reliability of circuit.
In any of the above-described technical scheme, it is preferable that the current source circuit also includes：First electric capacity, the first capacitance connection
Between the output end of amplifier and the reverse input end of amplifier, for adjusting the feedback phase of amplifier.
In the technical scheme, the current source circuit also include be connected to amplifier output end and amplifier it is reverse defeated
Enter the first electric capacity between end.By the feedback phase of the first capacitance adjustment amplifier, avoid amplifier from producing vibration, make amplification
Device energy steady operation, so as to increase the stability of circuit.
In any of the above-described technical scheme, it is preferable that the current source circuit also includes：3rd resistor, 3rd resistor connection
Between the output end and first resistor of second transistor, so that the electric current of the output end output of second transistor is by the 3rd electricity
Resistance after first resistor with being back to ground.
In the technical scheme, the current source circuit also include being connected to the output end of second transistor and first resistor it
Between 3rd resistor.When second transistor is converted to conducting by ending, it will produce big electric current, flow a current through the 3rd electricity
Resistance and first resistor are back to ground, can play a part of current limliting, so as to avoid second transistor from being burned, further lift electricity
The reliability on road.
In any of the above-described technical scheme, it is preferable that the current source circuit also includes：4th resistance, pulse signal pass through
Second transistor is inputted after 4th resistance.
In the technical scheme, the 4th resistance is the current-limiting resistance of second transistor input, when there is pulse current input
When, the problem of can avoiding causing second transistor to burn when electric current is excessive by the 4th resistance.
In any of the above-described technical scheme, it is preferable that the current source circuit also includes：Digital analog converter, digital analog converter
It is connected with the positive input of amplifier, for producing analog signal.
In the technical scheme, the current source circuit also includes the digital-to-analogue conversion being connected with the positive input of amplifier
Device, for producing analog signal.It should be appreciated by those skilled in the art that the digital analog converter is not that current source circuit institute is required,
The current source circuit can also realize constant current output under the control of other analog signals.
In any of the above-described technical scheme, it is preferable that the first transistor and second transistor include following any one：
PNP transistor, NPN transistor, N-type FET, p-type FET.
In the technical scheme, the first transistor, second transistor use common triode (PNP transistor, NPN type
Transistor) or FET (N-type FET, p-type FET) identical function can be reached.Selectivity is more clever
It is living, it is easier to realize, in the specific implementation, can more reasonably be designed according to being actually needed and (such as considering cost factor).
In any of the above-described technical scheme, it is preferable that the first transistor is N-type FET；Second transistor is positive-negative-positive
Transistor.
In any of the above-described technical scheme, it is preferable that the current source circuit also includes：Diode, diode, which is connected to, to be put
Greatly between the reverse input end of device and the output end of second transistor.
In the technical scheme, when end of oppisite phase Pulse Width Control transistor (i.e. second transistor) is PNP transistor, then
Amplifier reverse input end and second transistor output end among one diode of series connection, the diode is very heavy
Will, in second transistor from during ending and being changed into conducting, the electric current absorbing phenomenon of moment occurs in colelctor electrode, if do not had
It diode, then can cause the anti-phase terminal voltage lifting of amplifier, electric current a very high rush of current is occurred in turn-off transient；
And after adding diode, due to the one-way conduction characteristic of diode, prevent the electric current of second transistor colelctor electrode to absorb, then it is electric
Stream impact will not occur, thus it is possible to prevente effectively from second transistor fails, so as to increase the reliability and stability of circuit.
In any of the above-described technical scheme, it is preferable that the current source circuit also includes：5th resistance, the connection of the 5th resistance
Between the power end of second transistor and the input of second transistor.
In the technical scheme, the current source circuit also includes the power end and second transistor for being connected to second transistor
Input between the 5th resistance.5th resistance is the base pull-up resistor of second transistor.
The additional aspect and advantage of the present invention will become obvious in following description section, or the practice by the present invention
Recognize.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination accompanying drawings below to embodiment
Substantially and it is readily appreciated that, wherein：
Fig. 1 shows the schematic diagram of current source circuit according to an embodiment of the invention；
Wherein, the corresponding relation in Fig. 1 between reference and component names is：
102 operational amplifiers, 104 the first transistors, 106 second transistors, 108 first resistors；110 second resistances, 112
First electric capacity, 114 3rd resistors, 116 the 4th resistance, 118 diodes, 120 the 5th resistance.
Embodiment
It is below in conjunction with the accompanying drawings and specific real in order to be more clearly understood that the above objects, features and advantages of the present invention
Mode is applied the present invention is further described in detail.It should be noted that in the case where not conflicting, the implementation of the application
Feature in example and embodiment can be mutually combined.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be different from other modes described here using other to implement, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
Referring to the current source circuit in Fig. 1 descriptions according to some embodiments of the invention.
As shown in figure 1, according to one embodiment of present invention, it is proposed that a kind of current source circuit, including：Operational amplifier
102nd, the first transistor 104, second transistor 106, first resistor 108, wherein, operational amplifier 102, its positive input is
Input end of analog signal, its reverse input end are the electric current of voltage signal feedback end, the reverse input end and the first transistor 104
Output end is connected, and its output end is connected with the input of the first transistor 104；The current output terminal of the first transistor 104 passes through
First resistor 108 is grounded；The input of second transistor 106 is pulse signal input terminal, its output end and operational amplifier 102
Reverse input end connection.
Current source circuit provided by the invention, by operational amplifier 102, first resistor 108, the first transistor 104 and
Two-transistor 106 is formed, wherein, first resistor 108 is sampling resistor.The in-phase input end of operational amplifier 102 is believed for simulation
Number input, its inverting input are control feedback end；When there is analog signal input, there is provided one controls voltage to operation amplifier
During the in-phase end of device 102, operational amplifier 102 exports the input of a driving voltage driving the first transistor 104, and first is brilliant
Output current is back to through overload (such as resistance) and first resistor 108 after body pipe 104 turns on, output current flows through the first electricity
The end of oppisite phase of operational amplifier 102 is fed back to after resistance 108 after one feedback voltage of generation, due to empty short, the empty disconnected spy of amplifier input
Property, feedback signal is finally reached after analog input signal voltage and no longer raises, and electric current reaches stable, so as to realize that voltage-controlled constant current is defeated
Go out.Pulse signal is directly inputted to the anti-phase saturation end of operational amplifier 102 by second transistor 106.When pulse signal inputs
For high level when, second transistor 106 ends, the normal output current of current source；When pulse signal input is low level, second
Transistor 106 is converted to conducting by cut-off, and the end of oppisite phase of operational amplifier 102 is forced to draw high, operational amplifier 102 therefore and
Cut-off, the input of the first transistor 104 end after losing driving voltage, output current shut-off.The current source circuit of the present invention,
Using the anti-phase saturated characteristic of amplifier in voltage-controlled current source, the output of instantaneous trip current source, reach the purpose that pulse exports；Together
When, because current source analog input end without chopper circuit, current source circuit can work under extremely low input voltage, can reach
10uV, this characteristic make the current source circuit obtained in the case where sampling resistor is constant wide scope pulse current output.
In one embodiment of the invention, it is preferable that the first transistor 104 is N-channel MOS pipe, second transistor 106
For PNP type triode.Specifically, operational amplifier 202, its positive input is input end of analog signal, its reverse input end
For voltage signal feedback end, reverse input end is connected with the source electrode of N-channel MOS pipe, its output end and the grid of N-channel MOS pipe
Connection；The source electrode of N-channel MOS pipe is grounded by first resistor 208；The base stage of PNP type triode is pulse signal input terminal, its
Emitter stage is connected with the reverse input end of operational amplifier 202.
It is worth it is emphasized that here, illustrated by taking N-channel MOS pipe, PNP type triode as an example, still, ability
Field technique personnel it should be understood that transistor Q1, transistor Q2 can reach identical function using triode or metal-oxide-semiconductor,
As long as the output of instantaneous trip current source can be realized, reach the purpose of pulse output, be possible to.
In one embodiment of the invention, it is preferable that the current source circuit also includes：Second resistance 110, second resistance
110 are connected between the input of the output end of operational amplifier 102 and the first transistor 104, for reducing the first transistor
104 switching speed.
In this embodiment, when there is analog signal input, there is provided an in-phase end for controlling voltage to operational amplifier 102
When, operational amplifier 102 exports a driving voltage and the grid of the first transistor 104 is driven after second resistance 110, makes the
One transistor 104 turns on, and avoids the first transistor 104 from opening moment generation current over pulse, and causes the first transistor 104 to lose
Effect, so as to effectively lift the reliability of circuit.
In one embodiment of the invention, it is preferable that the current source circuit also includes：First electric capacity 112, the first electric capacity
112 are connected between the reverse input end of the output end of operational amplifier 102 and operational amplifier 102, are put for adjusting computing
The feedback phase of big device 102.
In this embodiment, the feedback phase of operational amplifier 102 is adjusted by the first electric capacity 112, avoids operation amplifier
Device 102 produce vibration, can steady operation, so as to increase the stability of circuit.
In one embodiment of the invention, it is preferable that the current source circuit also includes：3rd resistor 114,3rd resistor
114 are connected between the output end of second transistor 106 and first resistor 108, so that the electric current warp that second transistor 106 exports
3rd resistor 114 is crossed with being back to ground after first resistor 108.
In this embodiment, when second transistor 106 is converted to conducting by cut-off, it will produce big electric current, make electricity
Stream flows through 3rd resistor 114 and first resistor 108 is back to ground, can play a part of current limliting, so as to avoid second transistor
106 are burned, and further lift the reliability of circuit.
In one embodiment of the invention, it is preferable that the current source circuit also includes：4th resistance 116, pulse signal
Second transistor 106 is inputted after the 4th resistance 116.When there is pulse current input, can be avoided by the 4th resistance 116
The problem of causing second transistor 106 to burn when electric current is excessive.
In one embodiment of the invention, it is preferable that the current source circuit also includes：Digital analog converter, digital-to-analogue conversion
Device is connected with the positive input of operational amplifier 102, for producing analog signal.
It should be appreciated by those skilled in the art that the digital analog converter is not required, the current source circuit of current source circuit
Constant current output can also be realized under the control of other analog signals.
In one embodiment of the invention, it is preferable that the current source circuit also includes：Diode 118, diode 118
It is connected between the reverse input end of operational amplifier 102 and the output end of second transistor 106.
In this embodiment, due to being PNP transistor in end of oppisite phase Pulse Width Control transistor, then in operational amplifier
One diode 118 of middle series connection of 102 reverse input end and the output end of second transistor 106, the diode 118 is very
Important, during second transistor 106 is changed into conducting from cut-off, the electric current absorbing phenomenon of moment occurs in colelctor electrode, such as
Fruit does not have diode 118, then can cause the anti-phase terminal voltage lifting of operational amplifier 102, causes electric current to occur in turn-off transient
One very high rush of current；And after adding diode 118, due to the one-way conduction characteristic of diode 118, prevent the second crystalline substance
The electric current of the colelctor electrode of body pipe 106 absorbs, so as to which rush of current will not occur, thus it is possible to prevente effectively from second transistor 106
Failure, so as to increase the reliability and stability of circuit.
In one embodiment of the invention, it is preferable that the current source circuit also includes：5th resistance 120, the 5th resistance
120 are connected between the drain electrode of second transistor 106 and grid, are the base pull-up resistor of second transistor.
In another embodiment of the present invention, it is proposed that a kind of current source circuit, including：Amplifier, the first transistor,
Second transistor, first resistor, wherein, amplifier, its positive input is input end of analog signal, and its reverse input end is electricity
The current output terminal connection of pressure signal feedback end, the reverse input end and the first transistor, its output end and the first transistor
Input connects；The current output terminal of the first transistor is grounded by first resistor；The input of second transistor is believed for pulse
The reverse input end of number input, its output end and amplifier connects.
In this embodiment, pulse signal is directly inputted to the anti-phase saturation end of operational amplifier, and pressure makes its anti-phase saturation
Control mode, the output of instantaneous trip current source, reach pulse output purpose；Simultaneously as current source analog input end
Without chopper circuit, current source circuit can work under extremely low input voltage, can reach 10uV, and this characteristic makes the current source
Circuit obtains the pulse current output of wide scope in the case where sampling resistor is constant.
In one embodiment of the invention, it is preferable that the first transistor is N-channel MOS pipe, and second transistor is P ditches
Road metal-oxide-semiconductor.It is worth it is emphasized that because end of oppisite phase Pulse Width Control transistor is P-channel metal-oxide-semiconductor, then in reverse input end
Without series diode between the output end of second transistor.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
- A kind of 1. current source circuit, it is characterised in that including：Amplifier, the first transistor, second transistor, first resistor, its In,The amplifier, its positive input are input end of analog signal, and its reverse input end is voltage signal feedback end, described Reverse input end is connected with the current output terminal of the first transistor, and its output end and the input of the first transistor connect Connect；The current output terminal of the first transistor is grounded by first resistor；The input of the second transistor is pulse signal input terminal, and its output end and the reverse input end of the amplifier connect Connect.
- 2. current source circuit according to claim 1, it is characterised in that also include：Second resistance, the second resistance be connected to the output end of the amplifier and the first transistor input it Between, for reducing the switching speed of the first transistor.
- 3. current source circuit according to claim 1, it is characterised in that also include：First electric capacity, first capacitance connection in output end and the amplifier of the amplifier reverse input end it Between, for adjusting the feedback phase of the amplifier.
- 4. current source circuit according to claim 1, it is characterised in that also include：3rd resistor, the 3rd resistor are connected between the output end of the second transistor and the first resistor, so that The electric current of the output end output of the second transistor is back to ground after the 3rd resistor and the first resistor.
- 5. current source circuit according to claim 1, it is characterised in that also include：4th resistance, the pulse signal input the second transistor after the 4th resistance.
- 6. current source circuit according to any one of claim 1 to 5, it is characterised in that also include：Digital analog converter, the digital analog converter are connected with the positive input of the amplifier, for producing the simulation letter Number.
- 7. current source circuit according to any one of claim 1 to 5, it is characterised in thatThe first transistor and the second transistor include any one of following：PNP transistor, NPN transistor, N Type FET, p-type FET.
- 8. current source circuit according to claim 7, it is characterised in thatThe first transistor is N-type FET；The second transistor is PNP transistor.
- 9. current source circuit according to claim 8, it is characterised in that also include：Diode, the diode be connected to the reverse input end of the amplifier and the second transistor output end it Between.
- 10. current source circuit according to claim 8, it is characterised in that also include：5th resistance, the 5th resistance are connected to the power end of the second transistor and the input of the second transistor Between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710744906.8A CN107589772B (en) | 2017-08-25 | 2017-08-25 | A kind of current source circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710744906.8A CN107589772B (en) | 2017-08-25 | 2017-08-25 | A kind of current source circuit |
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| Publication Number | Publication Date |
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| CN107589772A true CN107589772A (en) | 2018-01-16 |
| CN107589772B CN107589772B (en) | 2019-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5272432A (en) * | 1991-05-01 | 1993-12-21 | Winbond Electronics N.A. Corporation | DAC current source with stabilizing bias |
| US20090072755A1 (en) * | 2007-08-17 | 2009-03-19 | Texas Instruments Deutschland Gmbh | Light-emitting semiconductor device driver and method |
| EP2230579A1 (en) * | 2009-03-20 | 2010-09-22 | STMicroelectronics S.r.l. | Fast switching, overshoot-free, current source and method |
| CN102570296A (en) * | 2011-02-25 | 2012-07-11 | 北京国科世纪激光技术有限公司 | Drive circuit of laser diode |
| CN102722209A (en) * | 2012-07-12 | 2012-10-10 | 圣邦微电子（北京）股份有限公司 | Constant current source circuit |
-
2017
- 2017-08-25 CN CN201710744906.8A patent/CN107589772B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5272432A (en) * | 1991-05-01 | 1993-12-21 | Winbond Electronics N.A. Corporation | DAC current source with stabilizing bias |
| US20090072755A1 (en) * | 2007-08-17 | 2009-03-19 | Texas Instruments Deutschland Gmbh | Light-emitting semiconductor device driver and method |
| EP2230579A1 (en) * | 2009-03-20 | 2010-09-22 | STMicroelectronics S.r.l. | Fast switching, overshoot-free, current source and method |
| CN102570296A (en) * | 2011-02-25 | 2012-07-11 | 北京国科世纪激光技术有限公司 | Drive circuit of laser diode |
| CN102722209A (en) * | 2012-07-12 | 2012-10-10 | 圣邦微电子（北京）股份有限公司 | Constant current source circuit |
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| CN107589772B (en) | 2019-05-14 |
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Effective date of registration: 20191119 Address after: 528315 zone a, 2f, building B1, No. 3, liaoxin Road, Beijiao Town, Shunde District, Foshan City, Guangdong Province Patentee after: Kuka Robot (Guangdong) Co., Ltd. Address before: 528311, Beijiao community committee of Beijiao Town, Shunde District, Guangdong City, Foshan Province, 12, two, industrial road, Penglai Road, 2 Patentee before: Guangdong Midea Yaskawa Service Robot Co., Ltd. |
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