CN208888310U - Common-mode voltage conversion circuit and chip system - Google Patents
Common-mode voltage conversion circuit and chip system Download PDFInfo
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- CN208888310U CN208888310U CN201821563328.4U CN201821563328U CN208888310U CN 208888310 U CN208888310 U CN 208888310U CN 201821563328 U CN201821563328 U CN 201821563328U CN 208888310 U CN208888310 U CN 208888310U
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Abstract
This application involves a kind of common-mode voltage conversion circuit and chip systems.The common-mode voltage conversion circuit includes the first conversion circuit and the second conversion circuit.The common-mode voltage conversion circuit can connect in complicated circuit.The common-mode voltage conversion circuit can interfere source category with quantitative identification, and use corresponding control strategy, and the truncation of quick diagnosis EMC interference problem is converted to DM EMI.The common-mode voltage conversion circuit is detected and is judged by common-mode voltage, can be predicted interference depth in advance, and controlled in a certain range, be avoided measurement and control signal failure, prevent component damage.
Description
Technical field
This application involves voltage detecting technical fields, more particularly to a kind of common-mode voltage conversion circuit and chip system.
Background technique
In electricity field, there are many complicated circuits, and because power grid seals in, ground potential difference, equipment internal electric source cabling is easy
Power supply line is impacted, radiation interference is generated.In addition thunder and lightning, equipment electric arc, neighbouring radio station, high power radiation sources etc. are in signal
It is also easy to induce common-mode voltage on line.Common-mode voltage is sometimes larger, especially with the distribution power supply room of isolation performance difference, becomes
Send the common-mode voltage of device output signal generally higher, sometimes up to 130V.Common-mode voltage is convertible by unsymmetric circuit
Differential mode voltage directly affects measurement and control signal, causes component wear.Common-mode voltage can be direct current or alternating voltage.Due in complexity
The virtual voltage between different branch in circuit is unequal, will generate differential mode voltage.That is, common-mode voltage is not direct
Equipment is influenced, but influences equipment by being converted into differential mode voltage.Therefore, the detection of common-mode voltage is very in actual circuit
It is important.
Utility model content
Based on this, it is necessary to there is differential mode voltage interference in complicated circuit, provide a kind of common-mode voltage turn
Circuit is changed, by common-mode voltage present in detection of complex circuit, common-mode voltage is adjusted, to prevent common-mode voltage to be converted into differential mode
Voltage, and then influence the device performance in complicated circuit.
A kind of common-mode voltage conversion circuit, comprising:
First conversion circuit, for common-mode voltage to be converted to current signal；And
Second conversion circuit is electrically connected with first conversion circuit, for will first conversion circuit conversion after
Current signal is converted into the analog voltage signal of no common mode interference.
In one embodiment, further includes:
Digital signal processing circuit is electrically connected with second conversion circuit, for converting second conversion circuit
The analog voltage signal without common mode interference afterwards is converted into digital signal and carries out samples storage or further transmitting.
In one embodiment, the digital signal processing circuit includes:
Synchronised clock control unit, for generating fixed clock pulse signal；And
Signal transform processor is electrically connected with the synchronised clock control unit, receives the synchronised clock control unit
Clock control.
In one embodiment, first conversion circuit includes:
Current limiting unit has the first current limliting end and the second current limliting end, and first current limliting end is electrically connected to feeder ear；
Comparing unit, the comparing unit have first input end, the second input terminal, third input terminal and the first output
End, the first input end is for providing input voltage, and second input terminal is for providing reference voltage, the third input
End is used to provide the described the operating current of comparing unit, and the third input terminal is electrically connected with first current limliting end, for controlling
Make the operating current of the comparing unit within a preset range, and the third input terminal is electrically connected to the feeder ear；With
And
Unit is adjusted, is electrically connected with first output end, for completing the adjusting to input voltage, the adjusting unit
It is electrically connected with second current limliting end, so that the operating current adjusted in unit keeps the adjusting within a preset range
Unit has current output terminal, for exporting the current value after the adjusting unit is adjusted.
In one embodiment, the comparing unit includes:
First operational amplifier, the normal phase input end of first operational amplifier are the first input end, described the
The inverting input terminal of one operational amplifier is second input terminal.
In one embodiment, the comparing unit further include:
One end of 7th resistance, the 7th resistance is electrically connected with the normal phase input end of first operational amplifier；With
And
One end of 8th resistance, the 8th resistance is electrically connected with the normal phase input end of first operational amplifier, and
And the 8th resistance and the 7th resistor coupled in parallel are arranged；
In the other end common mode input of the 7th resistance, bigoted electricity is inputted in the other end of the 8th resistance
Pressure；And
One end of 5th resistance, the 5th resistance is electrically connected with the inverting input terminal of first operational amplifier.
In one embodiment, the adjusting unit includes:
Triode, the base stage of the triode are electrically connected with the output end of the comparing unit, the current collection of the triode
Pole is electrically connected with second current limliting end；And
Potentiometer, the potentiometer have first end, second end and adjustable side, the hair of the adjustable side and the triode
Emitter-base bandgap grading electrical connection, the first end are electrically connected with the other end of the 5th resistance, and the second end is electrically connected to ground terminal, when
When the adjustable side slides into the first end, the electric current of the current output terminal output is maximum, when the adjustable side slides into
When the second end, the electric current of the current output terminal output is minimum.
In one embodiment, second conversion circuit includes:
Second operational amplifier；
9th resistance is electrically connected with the current input terminal of second conversion circuit, for adjusting the second conversion electricity
The voltage on road；
One end of tenth resistance, the tenth resistance is electrically connected with one end of the 9th resistance, the tenth resistance
The other end is electrically connected with the normal phase input end of the second operational amplifier；
Eleventh resistor, one end of the eleventh resistor are electrically connected with one end of the 9th resistance, and described
It is grounded at the electrical connection of 11 resistance and the 9th resistance, the other end of eleventh resistor and the second operational amplifier
Inverting input terminal electrical connection；And
Twelfth resistor, be electrically connected to the second operational amplifier reverse input end and the second operational amplifier
Output end between.
In one embodiment, the tenth resistance is equal with the resistance value of the eleventh resistor.
A kind of chip system, including common-mode voltage conversion circuit described in any of the above embodiments and functional circuit.
The common-mode voltage conversion circuit provided herein includes the first conversion circuit and the second conversion circuit.It is described
Common-mode voltage conversion circuit can connect in complicated circuit.The common-mode voltage conversion circuit can be with quantitative identification interference source class
Not, and corresponding control strategy is used, the truncation of quick diagnosis EMC interference problem is converted to DM EMI.The common-mode voltage turns
It changes circuit to detect and judge by common-mode voltage, interference depth can be predicted in advance, and controlled in a certain range, avoided
Measurement and control signal failure, prevents component damage.
Detailed description of the invention
Fig. 1 is the common-mode voltage converting circuit structure schematic diagram provided in the application one embodiment；
Fig. 2 is the common-mode voltage converting circuit structure schematic diagram provided in the application one embodiment；
Fig. 3 is the circuit diagram of the first conversion circuit provided in the application one embodiment；
Fig. 4 is the physical circuit figure of the first conversion circuit and the second conversion circuit that provide in the application one embodiment；
Fig. 5 is the structural schematic diagram of the chip system provided in the application one embodiment.
Drawing reference numeral explanation:
Common-mode voltage conversion circuit 100
First conversion circuit 110
111 comparing unit 112 of current limiting unit adjusts unit 113
First current limliting end the second current limliting of M end N
First input end A the second input terminal B third input terminal C
First output end D current output terminal E
10 second resistance of first resistor, 11 first operational amplifier 12
13 triode 14 of 3rd resistor
5th resistance, 15 potentiometer, 16 first end W1 second end W2 adjustable side W3
The 8th resistance 18 of 7th resistance 17
Second conversion circuit 120
The tenth resistance 21 of 9th resistance 20
22 second operational amplifier 23 of eleventh resistor
Twelfth resistor 24
Digital signal processing circuit 130
131 signal transform processor 132 of synchronised clock control unit
Chip system 200
Functional circuit 210
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The common-mode voltage conversion circuit and chip system of the application is further elaborated.It should be appreciated that described herein specific
Embodiment is only used to explain the application, is not used to limit the application.
Referring to Fig. 1, providing the structural schematic diagram of the common-mode voltage conversion circuit 100 in the application one embodiment.
The common-mode voltage conversion circuit 100 includes the first conversion circuit 110 and the second conversion circuit 120.The common mode
Voltage conversion circuit 100 solves the problems, such as common-mode voltage because potential difference is unable to measure, the common-mode voltage conversion circuit 100
Realize the measurement for the mode voltage that disappears.
First conversion circuit 110 is used to common-mode voltage being converted to current signal.First conversion circuit 110
Specific structure can not do specific restriction, as long as can be realized the function that common-mode voltage is converted to current signal.
Second conversion circuit 120 is used to the current signal after first conversion circuit 110 conversion being converted into nothing
The analog voltage signal of common mode interference.The specific structure of second conversion circuit 120 can not also do specific restriction, as long as
It can be realized the analog voltage signal that the current signal after first conversion circuit 110 conversion is converted into no common mode interference
Function.
In the embodiment of the present application, by the first conversion circuit 110 by common-mode voltage UinIt is converted to current signal Ii, then again
By the second conversion circuit 120 by current signal IiIt is converted into the voltage signal U of no common modeo.It is provided by the embodiments of the present application described
Common-mode voltage conversion circuit 100 can connect in complicated circuit.The common-mode voltage conversion circuit 100 can be dry with quantitative identification
Source category is disturbed, and uses corresponding control strategy, the truncation of quick diagnosis EMC interference problem is converted to DM EMI.The common mode
Voltage conversion circuit 100 is detected and is judged by common-mode voltage, can predict interference depth in advance, and controlled in certain model
In enclosing, measurement and control signal failure is avoided, component damage is prevented.
Referring to Fig. 2, providing the structural schematic diagram of the common-mode voltage conversion circuit 100 in the application one embodiment.
The common-mode voltage conversion circuit 100 includes the first conversion circuit 110, the second conversion circuit 120 and digital signal
Processing circuit 130.The common-mode voltage conversion circuit 100 solves the problems, such as common-mode voltage because potential difference is unable to measure, institute
Stating common-mode voltage conversion circuit 100 realizes the measurement for the mode voltage that disappears.
The digital signal processing circuit 130 is used to complete by doing without common mode after second conversion circuit 120 conversion
The analog voltage signal disturbed is converted into digital signal and carries out samples storage or further transmitting.The digital signal processing circuit
130 specific structure can not also do specific restriction, as long as can be realized the nothing after second conversion circuit 120 conversion
The analog voltage signal of common mode interference is converted into the function that digital signal carries out samples storage or further transmits.
In the embodiment of the present application, by the first conversion circuit 110 by common-mode voltage UinIt is converted to current signal Ii, then again
By the second conversion circuit 120 by current signal IiIt is converted into the voltage signal U of no common modeo, finally it is sent into Digital Signal Processing electricity
The sampling channel on road 130.The common-mode voltage conversion circuit 100 provided by the embodiments of the present application can connect in complicated circuit
In, avoid DM EMI caused by the common-mode voltage in complicated circuit.
In one embodiment, the digital signal processing circuit 130 includes that synchronised clock control unit 131 and signal become
Change processor 132.The synchronised clock control unit 131 can generate the clock letter of fixed frequency using the crystal oscillator of certain frequency
Number.The signal transform processor 131 can be programmable signal processor, or non-programmable signal processing
Device.Programmable signal processor can change the function to be completed of processor by programming, have biggish versatility, also known as
General purpose signal processor.For example, the signal transform processor 131 may include a length of 2,4 or 8 by basic bit
Based on microprocessor chip, it is equipped with process control piece, interruption and DMA control sheet, clock slice etc. and constitutes.Its advantage is that programmable letter
The word length of number processor is adjustable, processing speed is fast, high-efficient.For another example, the signal transform processor 131 can also include
Signal Processors.The Signal Processors by arithmetic unit, multiplier, memory, program read-only memory (ROM),
Input/output interface or even analog/digital, D/A switch etc. can be fully integrated on monolithic.The fortune of the Signal Processors
Calculation speed is fast, precision is high, low in energy consumption versatile.The Signal Processors more suitable for the common operation of signal processing and
Data structure.For another example, the signal transform processor 131 may include super large-scale integration (VLSI) ARRAY PROCESSING
Device.The super large-scale integration array processor be it is a kind of using a large amount of processing units single instrction sequence control under to not
Same data complete identical operation, to obtain the signal processor of supercomputing.The super large-scale integration array
Processor is suitable for the strong signal processing tasks of big data quantity, intensive, operation repeatability.At the non-programmable signal
Device is managed using the process of signal processing algorithm as basic logical structure, program is not controlled, generally can be only done a kind of main place
Manage function.For example, the signal transform processor 131 may include fast fourier transform processor or digital filter group
At.The processing speed of this kind of processor is higher.
Referring to Fig. 3, in one embodiment, first conversion circuit 110 includes: current limiting unit 111, comparing unit
112 and adjust unit 113.
The current limiting unit 111 has the first current limliting end M and the second current limliting end N.First current limliting end M is electrically connected to confession
Electric end, the feeder ear can be to provide the battery of 12V DC voltage.The comparing unit 112 and 111 electricity of current limiting unit
Connection, and it is connected to the high level.The current limiting unit 111 is used to control the operating current of the comparing unit 112 pre-
If in range.The current limiting unit 111 plays the role of current limliting, the number of the resistance in the current limiting unit 111 and each electricity
The size of resistance resistance value does not do specific restriction.The current limiting unit 111 is used to limit the electricity in first conversion circuit 110
Stream avoids the device in the comparing unit 112 from being damaged in mA magnitude.In one embodiment, the current limiting unit 111
Including first resistor 10 and second resistance 11.
The comparing unit 112 has first input end A, the second input terminal B, third input terminal C and the first output end D.
For the first input end A for providing input voltage, input voltage may include actual input voltage and bias voltage.It is described
Second input terminal B is for providing reference voltage.The third input terminal C is used to provide the described the operating current of comparing unit 112.
The third input terminal C is electrically connected with first current limliting end M, for controlling the operating current of the comparing unit 112 pre-
If in range.Also, the third input terminal C is electrically connected to the feeder ear, and the voltage that the feeder ear can be+12V connects
Connect end.
An input terminal for adjusting unit 113 is electrically connected with the first output end D of the comparing unit 112, is used for
Complete the adjusting to input voltage.The adjusting unit 113 is electrically connected with second current limliting end N, so that the adjusting unit
Operating current in 113 is kept within a preset range.The adjusting unit 113 has current output terminal E, for exporting the tune
Save the current value after unit 113 is adjusted.
In one embodiment, the comparing unit 112 includes the first operational amplifier 12.First operational amplifier
The inverting input terminal of 12 normal phase input end common mode input and bias voltage, first operational amplifier 12 provides reference
Voltage.
In one embodiment, the comparing unit 112 further includes the 7th resistance 17, the 8th resistance 18 and the 5th resistance
15.One end of 7th resistance 17 is electrically connected with the normal phase input end of first operational amplifier 12.8th resistance
18 one end is electrically connected with the normal phase input end of first operational amplifier 12.And the 8th resistance 18 and the described 7th
Resistance 17 is arranged in parallel.In the other end common mode input of the 7th resistance 17, in the other end of the 8th resistance 18
Input bias voltage.One end of 5th resistance 15 is electrically connected with the inverting input terminal of first operational amplifier 12.Institute
The size for stating the 5th resistance 15 can be with sets itself.
In one embodiment, the adjusting unit 113 includes triode 14.The base stage of the triode 14 and the ratio
Output end compared with unit 112 is electrically connected.The collector of the triode 14 is electrically connected with second current limliting end N.Three pole
The emitter of pipe 14 with adjustable end be electrically connected.The adjusting unit 113 further includes potentiometer 16.The potentiometer 16 has
First end W1, second end W2 and adjustable side W3.The adjustable side W3 is electrically connected with the emitter of the triode 14.Described first
End W1 is electrically connected with the other end of the 5th resistance 15.The second end W2 is electrically connected to ground terminal.As the adjustable side W3
When sliding into the first end W1, the electric current of the current output terminal E output is maximum.When the adjustable side W3 slides into described
When two end W2, the electric current of the current output terminal E output is minimum.In one embodiment, the resistance value model of the potentiometer 16
It encloses and does not limit specifically, be able to achieve the regulation of 0mA-5mA electric current.
Specifically referring to Fig. 3, first conversion circuit 110 can be voltage/current conversion circuit.Described first turn
Changing circuit 110 can be by the voltage signal U of inputinIt is converted into meeting the current signal I of certain relationshipi(pass through described first turn
The electric current after circuit 110 converts is changed, is exported by the emitter of the triode 14).Current signal after conversion be one with
The current signal I of input voltage variationi.Output electric current I is required in certain load variation rangeiIt is able to maintain stabilization.Also
It is to say output electric current IiDo not change with the variation of load.I.e. described first conversion circuit 110 has constant-current source characteristic.Such as Fig. 3
Shown, in one embodiment, first conversion circuit 110 includes first resistor 10, second resistance 11, the first operation amplifier
Device 12,3rd resistor 13, triode 14, the 5th resistance 15, potentiometer 16, the 7th resistance 17 and the 8th resistance 18.Described first
The resistance value of resistance 10 is R3.The second resistance 11 is load resistance, and the resistance value of the load resistance is R.The 3rd resistor 13
Resistance value be R4.The resistance value of 5th resistance 15 is R5.The resistance value of the potentiometer 16 is adjustable, the range 0-R adjustedw。
The resistance value of 7th resistance 17 is R1.The resistance value of 8th resistance 18 is R2.First operational amplifier 12 can use
LM358 operational amplifier.The triode 14 can be set to BG9013 triode.
In the present embodiment, the 7th resistance 17 and the 8th resistance 18 each serve as the effect of partial pressure.The current potential
Device 16 plays metering function.The resistance value of the potentiometer 16 is adjustable, the range 0-R adjustedw, the potentiometer 16 can adjust
Current is in different ranges.The first resistor 10, the 3rd resistor 13 and the 5th resistance 15 play current limliting
Effect.For example, in one embodiment, 2R can be setw=0.5k Ω, R1=R2=10k Ω.And for R3, R4 and R5 points
Current limliting is not played the role of.The triode 14 can be driving triode 9013.The triode 14 is to protect driving electricity
Stream is no more than the limits of triode.The occurrence value of R3, R4 and R5 are related with the concrete model of the triode 14,
It does not limit specifically herein.
U in Fig. 31For bias voltage, UinFor input voltage, that is, voltage to be converted.The second resistance 11 is load resistance.
Wherein, first operational amplifier 12 plays comparator.First operational amplifier 12 is by positive terminal voltage input
Signal U+With reverse side voltage U-It is compared, is carried out again through the triode 14 after first operational amplifier 12 amplification
Amplification.The triode 14 penetrates a grade electric current IeIt acts on the potentiometer 16.The resistance sizes of the potentiometer 16 are adjustable
Section, range is 0-Rw.Above according to the property of first operational amplifier 12:
U_=IeRw=(1+ β) IlRwFormula (1)
β is the amplification factor of the triode 14 in formula (1).Load (second resistance 11) is flowed through as shown in Figure 3
Electric current is Io, i.e., the collector current I of the described triode 14Q=IQ=β IbIf enabling the resistance value of the 7th resistance 17 and described
The resistance value of 8th resistance 18 is equal, i.e. R1=R2, then
Because β > > 1, there is 2IQRw=(Uin-U1).As it can be seen that U1Under certain conditions, change RwIt can change defeated
Enter voltage UinWith output electric current IoProportionate relationship.In Fig. 3, if enabling U1=0V, 2Rw=0.5k Ω, R1=R2=10k Ω.
It can realize and the input voltage signal of 0~5V is converted into 0~10mA current signal.
In the present embodiment, the realization process of the common-mode voltage conversion circuit is: in voltage/current conversion stages, using
First conversion circuit 110 realizes that the d. c. voltage signal of 0V~5V is converted to 0mA~l0mA electric current.Become in current/voltage
The stage is changed, corresponding current signal is converted into using second conversion circuit 120 voltage signal of 0V~5V, is sent to institute
State the sampling channel of digital signal processing circuit 130.
Referring to Fig. 4, the physical circuit figure of first conversion circuit 110 and second conversion circuit 120 is provided,
And the electrical connection of first conversion circuit 110 and second conversion circuit 120.In one embodiment, described
Second conversion circuit 120 includes second operational amplifier 23, the 9th resistance 20, the tenth resistance 21, eleventh resistor the 22, the 12nd
Resistance 24 and second operational amplifier 23.
9th resistance 20 is electrically connected with the current input terminal of second conversion circuit 120, for adjusting described
The output voltage of two conversion circuits 120.The current input terminal of second conversion circuit 120 and the electricity for adjusting unit 113
Flow output end E electrical connection.One end of tenth resistance 21 is electrically connected with one end of the 9th resistance 20.Tenth resistance
21 other end is electrically connected with the normal phase input end of the second operational amplifier 23.One end of the eleventh resistor 22 and institute
One end electrical connection of the 9th resistance 20 is stated, and is grounded at the electrical connection of the eleventh resistor 22 and the 9th resistance 20.
The other end of eleventh resistor 22 is electrically connected with the inverting input terminal of the second operational amplifier 23.The twelfth resistor 24
It is electrically connected between the reverse input end of the second operational amplifier 23 and the output end of the second operational amplifier 23.
In one embodiment, the tenth resistance 21 is equal with the resistance value of the eleventh resistor 22.It is more preferable to guarantee
The realization second operational amplifier 23 function.
Specifically, second conversion circuit 120 can be current/voltage converter circuit referring to Fig. 4.It is described
Second conversion circuit 120 includes the 9th resistance 20, the tenth resistance 21, eleventh resistor 22, second operational amplifier 23 and the
12 resistance 24, electrical connection is as shown in Figure 4.The resistance value of 9th resistance 20 is R6, the resistance of the tenth resistance 21
Value is R7, the resistance value of the eleventh resistor 22 is R8, the resistance value of the twelfth resistor 24 is R9.Second conversion circuit
120 for converting input current signal to output voltage signal linear therewith.As shown in figure 4, input current Ii
First through input resistance R6Become input voltage Ui.The input voltage Ui=IiRi, by the input voltage UiIt is added to described
The in-phase end and backward end of two operational amplifiers 23 obtain output after the 23 difference ratio enlargement of second operational amplifier
Voltage Uo, as shown in formula (3):
It can obtain the output voltage UoWith the input current IiWith proportional relationship.Wherein resistance value is R6It is described
Requirement of 9th resistance 20 according to electric current output device (such as sensor) to load determines.The resistance value of general 9th resistance 20
It can be 1 kilohm or so.After the resistance value of the 9th resistance 20 determines, can according to the property of calculus of differences circuit, in order to
Guarantee the resistance balance of two input terminals of the second operational amplifier 23 over the ground, while in order to avoid reducing common mode inhibition
Than usually requiring that R7=R8。
In Fig. 4, the resistance value R of the eleventh resistor 228With the resistance value R of the twelfth resistor 249It is the ratio system of amplifier
Number.R8And R9Cooperation ensures the sampling voltage of the 9th resistance 20.R8And R9Setting it is also necessary to take into account that by it is described second fortune
After calculating amplifier 23, output voltage UoWithin the sample range of the digital signal processing circuit 130.Such as in a reality
It applies in example, R6It is the sampling resistor of 0mA~10mA electric current, R6Resistance value it is lower greatly can be according to the tool of sampled voltage and sample rate current
Body range is determined.R7It is the balance resistance of the second operational amplifier 23, with R8It matches.R8And R9It is amplifier
Proportionality coefficient, specific value is related with the concrete model of the second operational amplifier 23, does not limit specifically herein.
In the present embodiment, the physical circuit figure of second conversion circuit 120 is provided.Using second conversion circuit
120 can accurately and reliably be converted into the current signal after first conversion circuit 110 conversion the simulation of no common mode interference
Voltage signal.
In the application, at first conversion circuit 110, second conversion circuit 120 and the digital signal
Circuit 130 is managed to be electrically connected, avoid because ground level it is unstable caused by detection error, solve common-mode voltage because potential difference can not
Measurement problem realizes the mould measurement that disappears.Reduce common-mode voltage interference caused by each device in circuit simultaneously.
Referring to Fig. 5, in one embodiment, providing a kind of chip system 200.The chip system 200 includes as above
State any the common-mode voltage conversion circuit 100 and functional circuit 210.The common-mode voltage conversion circuit 100 and institute
The electrical connection of functional circuit 210 is stated, interferes source category for quantitative identification, and use corresponding control strategy, quick diagnosis EMC is dry
It disturbs problem truncation and is converted to DM EMI.The common-mode voltage conversion circuit 100 is detected and is judged, Neng Gouti by common-mode voltage
Preceding precognition interferes depth, and is controlled in a certain range, avoids measurement and control signal failure, prevents component damage.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
The limitation to utility model patent range therefore cannot be interpreted as.It should be pointed out that for the ordinary skill people of this field
For member, without departing from the concept of this application, various modifications and improvements can be made, these belong to the application's
Protection scope.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. a kind of common-mode voltage conversion circuit (100) characterized by comprising
First conversion circuit (110), for common-mode voltage to be converted to current signal；And
Second conversion circuit (120) is electrically connected with first conversion circuit (110), is used for first conversion circuit
(110) current signal after converting is converted into the analog voltage signal of no common mode interference.
2. common-mode voltage conversion circuit (100) as described in claim 1, which is characterized in that further include:
Digital signal processing circuit (130) is electrically connected with second conversion circuit (120), for second conversion is electric
The analog voltage signal without common mode interference after the conversion of road (120) is converted into digital signal and carries out samples storage or further pass
It passs.
3. common-mode voltage conversion circuit (100) as claimed in claim 2, which is characterized in that the digital signal processing circuit
(130) include:
Synchronised clock control unit (131), for generating fixed clock pulse signal；And
Signal transform processor (132) is electrically connected with the synchronised clock control unit (131), receives the synchronised clock control
The clock control of unit (131) processed.
4. common-mode voltage conversion circuit (100) as described in claim 1, which is characterized in that first conversion circuit (110)
Include:
There is current limiting unit (111) the first current limliting end (M) and the second current limliting end (N), first current limliting end (M) to be electrically connected to
Feeder ear；
Comparing unit (112), the comparing unit (112) have first input end (A), the second input terminal (B), third input terminal
(C) and the first output end (D), the first input end (A) are used to mention for providing input voltage, second input terminal (B)
Supply reference voltage, the third input terminal (C) are used to provide the described the operating current of comparing unit (112), the third input
End (C) is electrically connected with first current limliting end (M), for controlling the operating current of the comparing unit (112) in preset range
It is interior, and the third input terminal (C) is electrically connected to the feeder ear；And
It adjusts unit (113), is electrically connected with first output end (D), for completing the adjusting to input voltage, the adjusting
Unit (113) is electrically connected with second current limliting end (N), so that the operating current adjusted in unit (113) is maintained at pre-
If the adjusting unit (113) has current output terminal (E) in range, after exporting adjusting unit (113) adjusting
Current value.
5. common-mode voltage conversion circuit (100) as claimed in claim 4, which is characterized in that comparing unit (112) packet
It includes:
First operational amplifier (12), the normal phase input end of first operational amplifier (12) are the first input end (A),
The inverting input terminal of first operational amplifier (12) is second input terminal (B).
6. common-mode voltage conversion circuit (100) as claimed in claim 5, which is characterized in that the comparing unit (112) is also wrapped
It includes:
The normal phase input end electricity of 7th resistance (17), one end of the 7th resistance (17) and first operational amplifier (12)
Connection；
The normal phase input end electricity of 8th resistance (18), one end of the 8th resistance (18) and first operational amplifier (12)
Connection, and the 8th resistance (18) is arranged in parallel with the 7th resistance (17), in the another of the 7th resistance (17)
Common mode input is held, inputs bias voltage in the other end of the 8th resistance (18)；And
The inverting input terminal electricity of 5th resistance (15), one end of the 5th resistance (15) and first operational amplifier (12)
Connection.
7. common-mode voltage conversion circuit (100) as claimed in claim 6, which is characterized in that adjusting unit (113) packet
It includes:
The base stage of triode (14), the triode (14) is electrically connected with the output end of the comparing unit (112), three pole
The collector of pipe (14) is electrically connected with second current limliting end (N)；And
Potentiometer (16), the potentiometer (16) have first end (W1), second end (W2) and adjustable side (W3), the adjustable side
(W3) it is electrically connected with the emitter of the triode (14), the other end electricity of the first end (W1) and the 5th resistance (15)
Connection, the second end (W2) is electrically connected to ground terminal, described when the adjustable side, (W3) slides into the first end (W1)
The electric current of current output terminal (E) output is maximum, and when the adjustable side, (W3) slides into the second end (W2), the electric current is defeated
The electric current of outlet (E) output is minimum.
8. common-mode voltage conversion circuit (100) as described in claim 1, which is characterized in that second conversion circuit (120)
Include:
Second operational amplifier (23)；
9th resistance (20) is electrically connected, for adjusting described second turn with the current input terminal of second conversion circuit (120)
Change the voltage of circuit (120)；
One end of tenth resistance (21), the tenth resistance (21) is electrically connected with one end of the 9th resistance (20), and described
The other end of ten resistance (21) is electrically connected with the normal phase input end of the second operational amplifier (23)；
One end of eleventh resistor (22), the eleventh resistor (22) is electrically connected with one end of the 9th resistance (20), and
And at the electrical connection of the eleventh resistor (22) and the 9th resistance (20) be grounded, the other end of eleventh resistor (22) with
The inverting input terminal of the second operational amplifier (23) is electrically connected；And
Twelfth resistor (24), the reverse input end and second operation for being electrically connected to the second operational amplifier (23) are put
Between the output end of big device (23).
9. common-mode voltage conversion circuit (100) as claimed in claim 8, which is characterized in that the tenth resistance (21) and institute
The resistance value for stating eleventh resistor (22) is equal.
10. a kind of chip system, which is characterized in that convert electricity including common-mode voltage as claimed in any one of claims 1-9 wherein
Road (100) and functional circuit (210).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109061281A (en) * | 2018-09-25 | 2018-12-21 | 珠海格力电器股份有限公司 | Common-mode voltage conversion circuit and chip system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109061281A (en) * | 2018-09-25 | 2018-12-21 | 珠海格力电器股份有限公司 | Common-mode voltage conversion circuit and chip system |
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