CN105159384B - Self-feedback control circuit - Google Patents
Self-feedback control circuit Download PDFInfo
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- CN105159384B CN105159384B CN201510546800.8A CN201510546800A CN105159384B CN 105159384 B CN105159384 B CN 105159384B CN 201510546800 A CN201510546800 A CN 201510546800A CN 105159384 B CN105159384 B CN 105159384B
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Abstract
A kind of self-feedback circuit, connects a CAN bus, and with a high voltage output level and a low-voltage output level of control output end, wherein, self-feedback control circuit includes a controller region drive circuit and a duplicate circuit.Duplicate circuit parallel controller region drive circuit, and there is feedback circuit and feedback circuit once on one.Upper feedback circuit and lower feedback circuit are commonly connected to a common-mode point, and the duplicate circuit point of common-mode since then produces a feedback signal, make feedback signal can control and be sent to the two-transistor of controller region drive circuit respectively via upper and lower feedback circuit, thereby complete the DC level to high-low voltage output level and control.
Description
Technical field
The present invention relates to a kind of control circuit；CAN bus etc. is can be widely applied to especially with regard to one
Application system, and there is the self-feedback control circuit of double feedback path.
Background technology
Controller local area network (Controller Area Network, CAN) is the rule just formulated in generation nineteen ninety
Lattice, and normalized in 1993 (ISO 11898-1), and be widely used on various vehicles with electronic installation.Typically
For, controller local area network (CAN) includes a serial bus, and it provides high safety grade and efficient real-time control, more
Possess and detectd the wrong and mechanism of priority differentiation, with under such mechanism so that it is the most reliable that the transmission of network message has become
And effective percentage.With current development apparently, existing controller local area network, not only have the elastic adjustment capability of height,
Platform can be increased in existing network and not be used on software and hardware the operation revising and adjust, in addition, its information
Transmission be not built on the platform of Special Category, further increase the convenience when upgrade of network.
It is said that in general, Fig. 1 discloses the Organization Chart of prior art one CAN bus, wherein, controller local
Such as having two platforms in network, it is platform 21 and platform 23, and via controlling, transceiver (CAN-Transceiver) 11 is common
It is connected to bus 30, and transmits differential via a high voltage output level CANH and a low-voltage output level CANL
(Differential) signal, to reach the transmission of control signal.In existing Digital Logic, as shown in Figure 2, when high electricity
When pressure output level CANH and low-voltage output level CANL is all 2.5 volts, then the digital signal system exported is " 1 ", extremely
In, if high voltage output level CANH rises to 3.5 volts, and when low-voltage output level CANL drops to 1.5 volts, the most defeated
The digital signal system gone out is expressed as " 0 ".Wherein, in the today being finer division of labour, in order to maintain high voltage output level CANH with low
The stability of voltage output level CANL, prior art such as U.S. Patent number US 6,922,073 proposes a kind of in order to flat then
The circuit design of weighing apparatus bus output stage voltage, its drive circuit is mainly by amplifier before an output circuit and
(preamplifier) constituted, the driving voltage source of amplifier before simultaneously utilizing the control circuit in single loop to control so that
The output equivalent resistance (Ron) of circuit side can be equal to the equivalent resistance of opposite side output stage, thereby reaches DC voltage-stabilizing
The effect controlled.
It should be noted, however, that in order to reach such circuit design, either at system design end or chip
Design end, it is necessary to apply to substantial amounts of electric circuitry packages, and be at most only capable of under connected modes different from logic circuit
Hands goes to evade.In this situation, not only seem addition difficult by the design making integrated circuit, its assembly that must expend
Quantity promotes the most significantly with circuit cost, does not the most considerably meet economy and cost benefit.
Therefore the present inventor improving thoughts on drawbacks described above, and according to the correlation experience being engaged in for many years in this respect,
Concentrated observation and research, and coordinate the utilization of scientific principle, and propose a kind of modern design and be effectively improved the present invention of drawbacks described above,
Disclose a kind of self-feedback control circuit, its concrete framework and embodiment will be described under.
Summary of the invention
For solving the problem that prior art exists, a purpose of the present invention is to provide a kind of self-feedback control circuit, its
A kind of circuit design innovated completely of pioneering exposure, and reach the accurate control to output stage d. c. voltage signal by this design
System.
A further object of the present invention is to provide a kind of self-feedback control circuit, its utilize a duplicate circuit it include,
The feedback circuit of lower two-way is produced a feedback signal by common-mode point, self-feedback can control upper and lower two-way for this feedback signal
Transistor gate, thereby completes the DC level to output stage voltage and controls.
It is still another object of the present invention to provide a kind of self-feedback control circuit, it is except can be applicable to controller local area network
Outside network bus, more can be widely applied to the control system of other industry, to maintain the stability of output stage direct current differential wave.
Therefore according to disclosed self-feedback control circuit, it is connected to a CAN bus, with
Control a high voltage output level and a low-voltage output level of CAN bus.Enforcement according to the present invention
Example, self-feedback control circuit system includes a controller region drive circuit and a duplicate circuit.Wherein, controller region is driven
Galvanic electricity road connect CAN bus, and include a first transistor, a transistor seconds, one first passive component with
And one second passive component, the first transistor and the first passive component system are sequentially serially connected with an input power and high voltage output electricity
Between Ping, transistor seconds and the second passive component system are sequentially serially connected with between an earth terminal and low-voltage output level.
Duplicate circuit is parallel to described controller region drive circuit, and duplicate circuit has feedback circuit and on
Lower feedback circuit, wherein, upper feedback circuit and lower feedback circuit are commonly connected to a common-mode point, and the duplicate circuit point of common-mode since then produces
Raw credit number once so that this feedback signal can be sent to control via described upper feedback circuit and lower feedback circuit respectively
The first transistor of device region drive circuit and transistor seconds, thereby complete output stage high voltage output level and low-voltage
The DC level of output level controls.
According to embodiments of the invention, wherein go up feedback circuit and further included a third transistor, one the 3rd passive component
With one the 3rd resistance, this third transistor, the 3rd passive component and the 3rd resistance system are sequentially serially connected with input power and common-mode point
Between.Lower feedback circuit has further included one the 4th transistor, one the 4th passive component and one the 4th resistance, and the 4th transistor,
4th passive component and the 4th resistance are sequentially serially connected with between earth terminal and common-mode point.At this under design, third transistor is even
Being connected to the first transistor of controller region drive circuit, the 4th transistor is then connected to the of controller region drive circuit
Two-transistor.
Furthermore, according to embodiments of the invention, wherein, it is total that the resistance of described 3rd resistance is designed as controller local area network
In line n times of an output resistance, third transistor is respectively controller region drive circuit with the electric current of the 3rd passive component
The first transistor and 1/n times of the first passive component.Similarly, the resistance of described 4th resistance is designed as controller local area network
In bus n times of an output resistance, the electric current system for-itself control device region drive circuit of the 4th transistor AND gate the 4th passive component
Transistor seconds and 1/n times of the second passive component, n system is positive integer.
Therefore by disclosed herein the ingehious design of self-feedback control circuit, it can be successfully by the height of output stage
Pressure reduction between voltage output level and low-voltage output level is fixed as 2 volts, and the DC deviation value of its voltage summation controls
Below 100 millivolts, and maintain the stability of d. c. voltage signal, thereby realize the accurate control to output stage DC level signal
System, reaches the goal of the invention of the present invention.
Beneath by the graphic elaborate appended by specific embodiment cooperation, when being easier to understand the purpose of the present invention, skill
Art content, feature and the effect reached thereof.
Accompanying drawing explanation
Fig. 1 is the Organization Chart of prior art one CAN bus.
Fig. 2 is the oscillogram of the output stage voltage signal of prior art CAN bus.
Fig. 3 is the configuration diagram of the self-feedback control circuit according to the embodiment of the present invention.
Fig. 4 is the internal circuit schematic diagram of the self-feedback control circuit according to the embodiment of the present invention.
Fig. 5 is the illustrative view of the self-feedback control circuit of the embodiment of the present invention.
Fig. 6 is the waveform signal that the self-feedback control circuit of the embodiment of the present invention is applied to a CAN bus
Figure.
Fig. 7 is the circuit diagram of the self-feedback control circuit according to another embodiment of the present invention.
Description of reference numerals: 1-self-feedback control circuit；11-controls transceiver；20-CAN bus；21-
Platform；The upper feedback circuit of 22-；22 '-upper feedback circuit；23-platform；Feedback circuit under 24-；24 '-lower feedback circuit；30-is total
Line；100-controller region drive circuit；100 '-controller region drive circuit；200-duplicate circuit；M1,M2,M3,M4,
M5, M6, M7, M8-transistor；D1, D2, D3, D4-passive component；R0, R3, R4-resistance.
Detailed description of the invention
Above about illustrates in present disclosure, with following embodiment in order to demonstrate and to explain the spirit of the present invention
With principle, and the patent claim of the present invention is provided further to explain.Feature for the present invention, implementation and merit
Effect, hereby coordinate graphic make preferred embodiment describe in detail as follows.
Referring to shown in Fig. 3, it is the configuration diagram of the self-feedback control circuit according to the embodiment of the present invention.Such as Fig. 3
Shown in, disclosed self-feedback control circuit 1 is electrically coupled to a CAN bus (Controller
Area Network BUS, CAN BUS) 20.Wherein, this CAN bus 20 is via a high voltage output level
A CANH and low-voltage output level CANL transmits differential (Differential) signal, and at high voltage output level CANH
And each it is serially connected with between an intermediary output level SPLIT and intermediary output level SPLIT and low-voltage output level CANL
One output resistance R0 (or claiming terminal resistance).It is said that in general, the resistance of this output resistance R0 is such as chosen as 60 nurses difficult to understand, with two
The impedance of 120 nurses difficult to understand is formed after individual output resistance R0 series connection.The personage being only familiar with technique field certainly can be according to side circuit
Demand and designed, designed, it is not limited to the invention scope of the present invention.
According to embodiments of the invention, self-feedback control circuit 1 be include a controller region drive circuit 100 with also
It is coupled to a duplicate circuit 200 of this controller region drive circuit 100.Referring to shown in Fig. 4, it is the exposure embodiment of the present invention
The internal circuit schematic diagram of self-feedback control circuit.As it can be seen, controller region drive circuit 100 is to be electrically coupled to control
Device Area Network bus 20 processed, and controller region drive circuit 100 includes a first transistor M1, a transistor seconds
M2, one first passive component D1 and one second passive component D2, wherein, the first transistor M1 and the first passive component D1 system
Sequentially it is serially connected with between an input power VDD and high voltage output level CANH, transistor seconds M2 and the second passive component D2
The most sequentially it is serially connected with between an earth terminal GND and low-voltage output level CANL.
Duplicate circuit 200 parallel controller region drive circuit 100, and there is a pair of loop structure, it includes back coupling
Circuit 22 and lower feedback circuit 24.Wherein, upper feedback circuit 22 is to be commonly connected to a common-mode point VCM with lower feedback circuit 24,
The duplicate circuit 200 point VCM of common-mode since then produces credit FB once, so that this feedback signal FB can be respectively via upper back coupling
Circuit 22 and lower feedback circuit 24 and controls and is sent to the first transistor M1 and transistor seconds M2, thereby complete high voltage
The DC level of output level CANH and low-voltage output level CANL controls.
Fig. 5 discloses the illustrative view of the self-feedback control circuit of the embodiment of the present invention, please refer to shown in Fig. 4, in detail
For Xi, upper feedback circuit 22 is to include third transistor M3, one the 3rd passive component D3 and one the 3rd resistance R3, and under
Feedback circuit 24 is to include one the 4th transistor M4, one the 4th passive component D4 and one the 4th resistance R4, wherein, the 3rd crystal
Pipe M3, the 3rd passive component D3 and the 3rd resistance R3 system are sequentially serially connected with between input power VDD and common-mode point VCM, and the 4th is brilliant
Body pipe M4, the 4th passive component D4 and the 4th resistance R4 are the most sequentially serially connected with between earth terminal GND and common-mode point VCM.This one
In the explanation of demonstration example, the present invention uses the first transistor M1 and third transistor M3 to be all p-type metal-oxide half field effect transistor (P
Metal oxide semiconductor, PMOS), it is brilliant that transistor seconds M2 and the 4th transistor M4 is all N-type MOSFET
Body pipe (N metal oxide semiconductor, NMOS), the first passive component D1, the second passive component D2, the 3rd passive
Assembly D3 and the 4th passive component D4 system respectively diode, using the explanation as one embodiment of the invention.
According to embodiments of the invention, in the case, third transistor M3 connects and controls the lock of the first transistor M1
Pole, the 4th transistor M4 then connects and controls the gate of transistor seconds M2.In addition, further design for circuit
On selecting, being related to impedance and the size of each assembly, the resistance of system of the present invention design the 3rd resistance R3 should be output electricity
N times of resistance R0, the electric current system of third transistor M3 and the 3rd passive component D3 is respectively the passive group of the first transistor M1 and first
1/n times of part D1, n system is positive integer.Similarly, for lower feedback circuit 24, the resistance of the 4th resistance R4 should be output electricity
Resistance n times of R0, and the electric current of the 4th transistor M4 and the 4th passive component D4 also respectively transistor seconds M2 and second passive
1/n times of assembly D2, n system is positive integer.Thus seeing, the present invention is mainly to utilize duplicate circuit 200 to have upper and lower two loops
22,24 to carry out the ingehious design of signal back coupling, simultaneously collocation the first transistor M1, transistor seconds M2, third transistor M3,
4th transistor M4, the first passive component D1, the second passive component D2, the 3rd passive component D3, the 4th passive component D4, the 3rd
Resistance R3, setting in multiple proportion between each assembly resistance and size between the 4th resistance R4 and output resistance R0, the completeest
The DC level of the high voltage output level CANH and low-voltage output level CANL of output stage controls in pairs, it is achieved the present invention's
Goal of the invention.
Fig. 6 discloses the self-feedback control circuit of the embodiment of the present invention and is applied to the waveform of a CAN bus and shows
It is intended to.Oscillogram as shown in Figure 6, it can be clearly seen that, when the framework of the self-feedback control circuit that application disclosed herein
Design, then the magnitude of voltage system that can successfully make intermediary output level SPLIT is that high voltage output level CANH is defeated with low-voltage
Go out the half of level CANL summation, namely control intermediary output level SPLIT=(CANH+CANL)/2.Meanwhile, for control
For in the differential wave of the output stage of device Area Network bus, the most also can control high voltage output level CANH defeated with low-voltage
Go out the pressure reduction T1 between level CANL to be fixed in an interval range, such as: between 1.5 volts to 3 volts, can be the most preferably
2 volts.In addition, when integrated circuit is at aggressive mode (Dominant mode) and Passive Mode (Recessive mode)
Between when switching alternately, then the deviation value of the DC voltage summation of high voltage output level CANH and low-voltage output level CANL
(Offset) U1, U2 the most more can be controlled in 100 millivolts (mV) below, take off knowable to accumulative evidence and data therefore follow, this
Bright disclosed self-feedback control circuit really can perform effective DC level for the voltage of output stage and control, and can be extensive
Being applied in the application systems such as CAN bus (CAN BUS) or other industrial control systems, real system sets for one
Meter is good and can the remarkable self-feedback design on control circuit of effect.
For Ling Yifangmian, Fig. 7 discloses the circuit diagram of the self-feedback control circuit of another embodiment of the present invention.With front
Unlike one embodiment (Fig. 4), in the consideration for integrated circuit withstanding voltage and control, the controller in this embodiment
Region drive circuit 100 ' more can farther include at least one the 5th transistor M5 and at least one the 6th transistor M6, wherein,
5th transistor M5 system is serially connected with between the first transistor M1 and the first passive component D1, and the 6th transistor M6 system is serially connected with second
Between transistor M2 and the second passive component D2.Still further, the quantity system that arranges of the 5th transistor M5 can be independent one
Individual or concatenate more than one, similarly, the quantity that arranges of the 6th transistor M6 also may be selected to be independent one or go here and there simultaneously simultaneously
Connect more than one.In the Fig. 7 shown in the present embodiment, system of the present invention includes single with controller region drive circuit 100 '
Five transistor M5 and the 6th transistor M6, as the explanation of a demonstration example, are so not limited to the invention category of the present invention.Change
Speech, if the personage being familiar with technique field selects to concatenate a plurality of 5th transistors after in view of the pressure design of circuit
M5 or a plurality of 6th transistor M6, then should be under the jurisdiction of the invention category of the present invention.
Therefore in another embodiment in accordance with the invention, corresponding to the 5th transistor M5, then go up feedback circuit 22 ' more
It is serially connected with the 7th transistor M7 between third transistor M3 and the 3rd passive component D3, wherein, the 5th crystal including at least one
Pipe M5 and the 7th transistor M7 is all p-type metal-oxide half field effect transistor (PMOS), and the quantity that arranges of the 7th transistor M7 is tackled
The quantity of Ying Yu five transistor M5.Similarly, corresponding to the 6th transistor M6, then feedback circuit 24 ' is descended to further include at least
One is serially connected with the 8th transistor M8 between the 4th transistor M4 and the 4th passive component D4, wherein, the 6th transistor M6 and
Eight transistor M8 are all N-type metal-oxide half field effect transistor (NMOS), and the quantity that arranges of the 8th transistor M8 also should be corresponding to the
The quantity of six transistor M6.In addition, the electric current system of the 7th transistor M7 is designed as 1/n times of the 5th transistor M5, and
1/n times that current design is the 6th transistor M6 of eight transistor M8, n system is positive integer.
Therefore, in sum, according to disclosed self-feedback control circuit, it is solely to set one for a kind of novelty
The circuit design of lattice, not only can carry out static cost control for the output voltage of CAN bus so that it is output is being led
Differential wave under dynamic model formula can maintain about 2 volts, more circuit can be made at aggressive mode and quilt via dynamically control
When switching alternately between dynamic model formula, its surging still can be controlled in the interior of specification limit.Thus see, compared to prior art, this
Bright not only with the low complex degree in circuit design, low cost and dynamical advantage, integrated circuit more can be made to possess to be had
The function that splendid DC level controls, compared to prior art, has splendid industry applications and competitiveness in fact.
Described above it is merely exemplary for the purpose of the present invention, and nonrestrictive, and those of ordinary skill in the art understand,
In the case of the spirit and scope limited without departing from claims appended below, many amendments can be made, change, or etc.
Effect, but fall within protection scope of the present invention.
Claims (15)
1. a self-feedback control circuit, connects a CAN bus, to control this CAN bus
A high voltage output level and a low-voltage output level, it is characterised in that this self-feedback control circuit includes:
One controller region drive circuit, connects this CAN bus, and this controller region drive circuit includes
One the first transistor, a transistor seconds, one first passive component and one second passive component, wherein this first transistor with
This first passive component is sequentially serially connected with between an input power and this high voltage output level, this transistor seconds with this second
Passive component is sequentially serially connected with between an earth terminal and this low-voltage output level；And
One duplicate circuit, this controller region drive circuit in parallel, this duplicate circuit has on one feedback circuit and once feedbacks
Circuit, and on this, feedback circuit and this lower feedback circuit are commonly connected to a common-mode point, wherein, this duplicate circuit is from this common-mode point
Produce a feedback signal so that this feedback signal is sent to this first crystalline substance via feedback circuit on this and this lower feedback circuit respectively
Body pipe and this transistor seconds, to complete to control the DC level of this high voltage output level with this low-voltage output level；
Wherein, this CAN bus has further included at least two output resistances, and wherein this output resistance is series at this
Between high voltage output level and intermediary's output level, another this output resistance is series at this intermediary's output level and this low electricity
Between pressure output level.
Self-feedback control circuit the most according to claim 1, it is characterised in that on this, feedback circuit has further included one the 3rd
Transistor, one the 3rd passive component and one the 3rd resistance, this third transistor, the 3rd passive component are with the 3rd resistance sequentially
Be serially connected with between this input power and this common-mode point, and this third transistor connect this controller region drive circuit this first
Transistor.
Self-feedback control circuit the most according to claim 2, it is characterised in that this lower feedback circuit has further included one the 4th
Transistor, one the 4th passive component and one the 4th resistance, the 4th transistor, the 4th passive component are with the 4th resistance sequentially
It is serially connected with between this earth terminal and this common-mode point, and the 4th transistor connects this second crystalline substance of this controller region drive circuit
Body pipe.
Self-feedback control circuit the most according to claim 3, it is characterised in that the resistance of the 3rd resistance is this output electricity
N times of resistance, the electric current of this third transistor and the 3rd passive component be respectively this controller region drive circuit this first
1/n times of this first passive component of transistor AND gate, and n is positive integer.
Self-feedback control circuit the most according to claim 4, it is characterised in that the resistance of the 4th resistance is this output electricity
Resistance n times, the electric current of the 4th transistor AND gate the 4th passive component be respectively this controller region drive circuit this second
1/n times of this second passive component of transistor AND gate, and n is positive integer.
Self-feedback control circuit the most according to claim 5, it is characterised in that this first transistor and this third transistor
For p-type metal-oxide half field effect transistor.
Self-feedback control circuit the most according to claim 5, it is characterised in that this transistor seconds and the 4th transistor
For N-type metal-oxide half field effect transistor.
Self-feedback control circuit the most according to claim 5, it is characterised in that this first passive component, this is second passive
Assembly, the 3rd passive component and the 4th passive component are respectively a diode.
Self-feedback control circuit the most according to claim 3, wherein this controller region drive circuit further includes at least one
5th transistor AND gate at least the 6th transistor, it is first passive with this that this at least one the 5th strings of transistors is connected to this first transistor
Between assembly, this at least one the 6th strings of transistors is connected between this transistor seconds and this second passive component.
Self-feedback control circuit the most according to claim 9, it is characterised in that on this, feedback circuit further includes at least one
7th transistor, it is serially connected with between this third transistor and the 3rd passive component, and the setting of this at least one the 7th transistor
Put quantity to should the quantity of at least one the 5th transistor.
11. self-feedback control circuits according to claim 10, it is characterised in that the 5th transistor AND gate the 7th crystal
Pipe is p-type metal-oxide half field effect transistor.
12. self-feedback control circuits according to claim 11, it is characterised in that the current design of the 7th transistor is
1/n times of 5th transistor of this controller region drive circuit, n is positive integer.
13. self-feedback control circuits according to claim 10, it is characterised in that this lower feedback circuit further includes at least one
8th transistor, it is serially connected with between the 4th transistor AND gate the 4th passive component, and the setting of this at least one the 8th transistor
Put quantity to should the quantity of at least one the 6th transistor.
14. self-feedback control circuits according to claim 13, it is characterised in that the 6th transistor AND gate the 8th crystal
Pipe is N-type metal-oxide half field effect transistor.
15. self-feedback control circuits according to claim 14, wherein the current design of the 8th transistor is this control
1/n times of 6th transistor of device region drive circuit, n is positive integer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510546800.8A CN105159384B (en) | 2015-08-31 | 2015-08-31 | Self-feedback control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510546800.8A CN105159384B (en) | 2015-08-31 | 2015-08-31 | Self-feedback control circuit |
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| CN105159384A CN105159384A (en) | 2015-12-16 |
| CN105159384B true CN105159384B (en) | 2016-12-07 |
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| US11462900B2 (en) * | 2020-12-07 | 2022-10-04 | Amazing Microelectronic Corp. | Bus driving device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4215134B2 (en) * | 1998-05-06 | 2009-01-28 | エヌエックスピー ビー ヴィ | CAN bus driver with symmetrical differential output signal |
| DE10250576B4 (en) * | 2002-10-30 | 2005-04-28 | Infineon Technologies Ag | Circuit arrangement for signal balancing in antiphase bus drivers |
| DE102009000697B4 (en) * | 2009-02-06 | 2012-12-06 | Infineon Technologies Ag | Driver circuit for a two-wire line and method for generating two output currents for a two-wire line |
| DE102010043484A1 (en) * | 2010-11-05 | 2012-05-10 | Robert Bosch Gmbh | Apparatus and method for high data rate serial data transmission |
| JP2014110599A (en) * | 2012-12-04 | 2014-06-12 | Denso Corp | Two-wire differential voltage type output circuit and semiconductor device |
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