CN106771476A - A kind of high-tension current supervisory circuit - Google Patents
A kind of high-tension current supervisory circuit Download PDFInfo
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- CN106771476A CN106771476A CN201611056816.1A CN201611056816A CN106771476A CN 106771476 A CN106771476 A CN 106771476A CN 201611056816 A CN201611056816 A CN 201611056816A CN 106771476 A CN106771476 A CN 106771476A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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Abstract
A kind of high-tension current supervisory circuit of the present invention, including the first amplifier and the second amplifier；First amplifier connects busbar voltage and positive supply is powered, and the first amplifier includes the bleeder circuit being connected between busbar voltage and negative supply；The in-phase input end and inverting input of the first amplifier are connected to the two ends of flash sampling resistor by resistance R1 and resistance R2 respectively, the base stage of the output end connection output Darlington transistor of the first amplifier, the partial pressure output end of the first amplifier connects the base stage of corresponding partial pressure Darlington transistor respectively, level is associated between the colelctor electrode of the in-phase input end of the first amplifier and output Darlington transistor partial pressure Darlington transistor successively, and the emitter stage for exporting Darlington transistor is grounded through resistance R3；The partial pressure output end and positive supply that second amplifier connects the first amplifier are powered；The emitter stage of the in-phase input end connection output Darlington transistor of the second amplifier；Inverting input is grounded through resistance R4 respectively, and the output end of the second amplifier is connected through resistance R5；Output end output monitoring signal.
Description
Technical field
The present invention relates to semiconductor integrated circuit field, specially a kind of high-tension current supervisory circuit.
Background technology
Current monitoring circuit, as the term suggests, it is a kind of circuit for being sampled to system power signal and being amplified output, its
The conventional method of sample rate current is that the current signal of system is converted into voltage signal by external sampling resistor, according to sampling
Resistance be to connect power supply or ground connection and be referred to as flash sampling configuration as shown in Fig. 2 or low side sampling configuration it is as shown in Figure 1；Low side
The advantage of sampling be sampled voltage signal with ground potential as reference, subsequently can directly carry out signal transacting, but its shortcoming is also very bright
It is aobvious, i.e., because the actual reference of system ' ' current potential has been raised in the presence of sampled voltage, system operation irregularity may be caused.And it is high
Side sampling connects power supply so as to avoid the problem due to sampling resistor, but this method current monitoring circuit is proposed it is higher
It is required that, its input voltage range must work to supply voltage scope, and (differential mode is believed by monitoring signal small on sampling resistor
Number) collect and amplify.
Conventional high-tension current supervisory circuit has two kinds of configurations, and the first kind is using difference amplifier configuration, such as foreign countries TI
The INA117 circuits of company, structure when it is applied is as shown in figure 3, this configuration inside is built using operational amplifier and resistance
One subtraction circuit, to realize gathering difference mode signal in common-mode signal high and exporting, but this configuration major defect
There is 1. common mode input scope to be determined by R1, R2 resistance ratio, so circuit input common-mode range requirement R1/R2 ratios higher
Value is very big.Which results in when common mode input is relatively low, the input voltage of amplifier is relatively low.2. input has certain electricity over the ground
The electric current that stream, particularly VIN- ends are flowed into can produce pressure drop on sampling resistor, influence sampling precision, and the electric current with common mode electricity
Pressure (busbar voltage) raise and it is linearly increasing.The resistance of (R1+R2) must be sufficiently large when therefore designing, and this can take a large amount of domains
Area.And larger resistance can cause amplifier input offset current to produce larger error voltage thereon.3. the circuit pair
Common-mode voltage rejection ability depends critically upon resistance precision, and ideally common-mode gain is zero, and actually resistance is relative by mistake
Difference is bigger, and circuit common-mode gain also can be linearly increasing therewith, can directly influence output accuracy.
Equations of The Second Kind is, using voltage-to-current-voltage conversion configuration, the difference mode signal of flash first to be converted into electric current, is transmitted
Voltage is reconverted into after to low side and amplifies output, it is typical such as the INA19X chain of circuits of TI companies of foreign countries.But, no matter adopt
Which kind of design configuration is used, the requirement of supply voltage can be covered to meet input voltage, it is all proposed to monolithic integrated optical circuit technique
Requirement higher, i.e. device are pressure-resistant to have to be larger than system power source voltage, by taking DC/DC modules as an example, general busbar voltage model
Enclose including 47V, 100V, 200V etc., then process conditions requirement at least device work compression resistance is higher than 47V, 100V, 200V, and this is to work
The technical conditions requirement of skill line is very high, while also limit common production line cannot produce such circuit.
The content of the invention
For problems of the prior art, the present invention provides a kind of high-tension current supervisory circuit, based on conventionally fabricated
Bipolar integrated circuit, line construction rationally, design it is ingenious, can be used in flash sampling high pressure conditions.
The present invention is to be achieved through the following technical solutions：
A kind of high-tension current supervisory circuit, including the first amplifier and the second amplifier；
The first amplifier connection busbar voltage and positive supply are powered, and the first amplifier includes being connected to busbar voltage and negative electricity
Bleeder circuit between source；The in-phase input end and inverting input of the first amplifier are connected to by resistance R1 and resistance R2 respectively
The two ends of flash sampling resistor, the base stage of the output end connection output Darlington transistor of the first amplifier, the partial pressure output of the first amplifier
End connects the base stage of corresponding partial pressure Darlington transistor respectively, and level is associated in the in-phase input end of the first amplifier to partial pressure Darlington transistor successively
And the colelctor electrode of output Darlington transistor between, the emitter stage for exporting Darlington transistor is grounded through resistance R3；
The partial pressure output end and positive supply that second amplifier connects the first amplifier are powered；The in-phase input end of the second amplifier
The emitter stage of connection output Darlington transistor；The inverting input of the second amplifier is grounded through resistance R4 respectively, through resistance R5 connections the
The output end of two amplifiers；The output end output monitoring signal of the second amplifier.
Preferably, the second amplifier includes the constant-current source mould being made up of Low Drift Temperature reference current generating circuit and multistage current mirror
Block；The reference current correspondence that constant current source module output end is produced is connected to two Constant current input ends of the first amplifier, and is the
Two amplifiers provide bias current.
Further, the first described amplifier also includes constant current bias circuit, input stage circuit and output-stage circuit；
Input stage circuit includes being connected to the in-phase input end of the first amplifier and the input stage differential pair of inverting input, defeated
Enter a grade differential pair triode connect respectively busbar voltage power and constant pressure biasing circuit access reference current；
Each partial pressure output end of bleeder circuit is respectively arranged with three groups of voltage buffer units of parallel connection, all of first group of electricity
Level is associated between the in-phase input end of the first amplifier and output-stage circuit pressure buffer cell successively, all of second group of voltage buffer
Level is associated between the inverting input of the first amplifier and output-stage circuit unit successively, all of 3rd group of voltage buffer unit according to
Secondary is associated between the input of constant pressure biasing circuit and the first Constant current input end；
Feeder ear connection positive supply and the negative supply of output-stage circuit, reference current end connects the input of the second constant-current supply
End, output end connects the first amplifier output end.
Further, constant pressure biasing circuit connects the first Constant current input end through input current mirror；First amplifier output end
The second constant-current supply input is connected through current mirror output, input current mirror is identical with the ratio of current mirror output.
Further, voltage buffer unit is constituted using Darlington transistor or MOS multiple tubes.
Preferably, the resistance of resistance R1 and resistance R2 is equal.
Preferably, output Darlington transistor and partial pressure Darlington transistor are used with polar form Darlington transistor.
Preferably, described bleeder circuit is made up of the diode connected and multiple resistance, and the two ends of resistance are respectively provided with
Partial pressure output end.
Compared with prior art, the present invention has following beneficial technique effect：
According to the rule of semiconductor integrated circuit technique, using triode CE breakdown voltages as the character voltage of technique
Value, and breakdown voltage can tune to much larger than technology characteristics voltage between its big knot (i.e. N-type extension and P type substrate).Therefore this hair
It is bright first by setting bleeder circuit, and the conventional arrangement of divider resistance value ensures ohmically partial pressure value not more than technique
Character voltage, circuit inside relates to the device that high pressure changed to low pressure, and to have carried out partial pressure by darlington structure gentle
Punching, it is ensured that the operating voltage of any one device is in normal range (NR).And because big junction breakdown is pressure-resistant very high, as long as circuit
No more than tying pressure-resistant greatly, the circuit structure can normal work, therefore the present invention for the N epitaxial regions voltage that internal all devices are related to
Realize the current monitoring circuit that the device of 50V techniques making can be operated under 100V buses.The present invention is by using conventional double
Pole technique realizes input voltage range and amplifier precision higher, can be applied to power-supply system high side voltage sampling and
Current monitoring, solves the problems, such as that general high voltage current monitoring circuit is higher to process conditions requirement, and the technology is also extended to
Other kinds of processes platforms, such as CMOS other semiconductor technology types；It is easy to integrated with other functional circuits, with wide
Application prospect and economic benefit.
Brief description of the drawings
Fig. 1 is the low side sampling schematic block diagram of current monitoring in the prior art.
Fig. 2 is the sampling schematic block diagram of current monitoring flash in the prior art.
Fig. 3 is the INA117 circuit diagrams of TI companies in the prior art.
Fig. 4 is the electrical block diagram described in present example.
Fig. 5 is the basic structure schematic diagram of the first amplifier described in present example.
Fig. 6 is the first amplifier structure for including the bleeder circuit of multi-cascade and voltage buffer unit described in present example
Schematic diagram.
Fig. 7 is the concrete structure schematic diagram of the first amplifier described in present example.
Fig. 8 is the basic structure schematic diagram of the second amplifier described in present example.
Specific embodiment
With reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
A kind of high-tension current supervisory circuit of the present invention, as shown in figure 4, realized respectively using two stage amplifer high pressure sampling-
The function that Current Voltage is changed and amplified.
The present invention is in voltage flash by being connected into the first amplifier amp1 of closed loop by sampled voltage (VIN+—VIN-) be converted to
Current signal I, according to empty short-empty disconnected method of operational amplifier, can calculate
(VIN+- VIN-)=R1 × I (1)
Current signal I through three-level Darlington transistor Q1Q2, Q3Q4, Q5Q6 transmit from voltage flash to voltage low side, and
Voltage signal is converted on resistance R3, output is then amplified by the second amplifier amp2.Wherein, Darlington transistor Q5Q6 is reached for output
Islington pipe, Darlington transistor Q1Q2, Q3Q4 are respectively the partial pressure Darlington transistor for being connected to the first amplifier partial pressure output end.
First amplifier is made up of high pressure, low pressure two parts, is powered by IN+ ends and VCC ends respectively, using when IN+ ends and
The high voltage bus of the common welding system in VS ends.
Resistance R2 resistance values are equal to the resistance of resistance R1, are produced on resistance R1 for balancing the first amplifier input bias current
Raw voltage drop, prevents the precision of its influence Voltage-current conversion.
Darlington transistor Q1Q2, Q3Q4, Q5Q6 constitute electric current transmission channel, and current signal is transferred into electricity by voltage flash
Side is forced down, its base potential is provided by the bleeder circuit inside the first amplifier, can be with by the cascade form of this series connection partial pressure
Ensure that the CE voltages of each device are limited in its CE breakdown voltage.
Second amplifier is set to in-phase amplifier by closed loop resistance R4, R5, and the voltage signal of R3 × I is amplified into defeated again
Go out.The biasing module of the circuit is further comprises inside second amplifier.
Wherein, as shown in figure 5, the first amplifier is main by bleeder circuit, constant current bias circuit, input stage circuit, output stage
The part of circuit four constitute, wherein input stage circuit and constant current bias circuit because being related to hot side, by concatenating voltage buffer list
Unit realizes high withstand voltage ability, and buffer structure is depressured using Darlington in this preferred embodiment.
Q7Q8 is input stage differential pair, and Q9Q10Q11Q12 is to provide constant biasing, the electric current letter of differential pair to differential pair
Number by Darlington be depressured buffer structure (Q16Q17, Q18Q19 and Q22Q23, Q24Q25) be transferred to active load Q29Q30, and
Turn single structure Q28, Q31 and cascode amplifying stage Q32 outputs by double.
What first and second Constant current input end LB1 of the first amplifier and LB2 ports were provided by the constant current source module of the second amplifier
Reference current, Q33Q34 compositions and Q9Q10Q11Q12 ratio identical current-mirror structures, it is ensured that the electric current letter of LB1, LB2 port
Number without loss be transferred to respective amplifying stage device.
The partial pressure value vb1 and vb2 of bleeder circuit are supplied to Darlington voltage buffer unit (Q16Q17, Q18Q19, Q20Q21
With Q22Q23, Q24Q25, Q26Q27), voltage buffer unit also can be used other darlington structures or MOS multiple tubes to constitute, together
When, bleeder circuit and voltage buffer structure also dependent on the form for needing to expand to multi-cascade, as shown in Figure 6.
Specifically, as shown in fig. 7, the first amplifier is divided into high pressure, two parts of low pressure, wherein high-pressure section only realizes sampling
Input difference voltage (VIN+- VIN-) effect, and signal is transmitted to low voltage section by with foregoing similar step-down buffer structure
Point, its static current of lcd sets relatively low, is only made up of the current source of differential pair and the electric current of buffering partial pressure.
Diode D1, D2 and resistance R11, R12 bleeder circuit in series, its partial pressure value vb1 and vb2 be supplied to Da Lin
Pause and be depressured buffer cell (Q16Q17, Q18Q19, Q20Q21 and Q22Q23, Q24Q25, Q26Q27).
Q7Q8 is input stage differential pair, and Q9Q10Q11Q12 and Q13Q14Q15 is to provide constant biasing to differential pair, poor
Point to current signal by Darlington step-down buffer cell (Q16Q17, Q18Q19 and Q22Q23, Q24Q25) be transferred to it is active
Load Q29Q30, and turn single structure Q28, Q31 and cascode amplifying stage Q32 outputs by double.
First and second Constant current input end LB1 of the first amplifier and LB2 ports connect first and second constant current of the second amplifier amp2
The constant current source signal that source output terminal LB1 and LB2 are provided, Q33Q34Q35Q36 compositions and Q9Q10Q11Q12 and Q13Q14Q15 ratios
Identical current-mirror structure, it is ensured that the current signal of LB1, LB2 port is transferred to respective amplifying stage device without loss.
C5 electric capacity is miller compensation electric capacity, and C1C2C3C4 is filter capacitor, is used to the frequency characteristic of stabilizing circuit work.
As shown in figure 8, being broadly divided into constant-current source, input stage, four work(of interstage amplifier section and output stage inside the second amplifier
Can module, Q37, Q38 be input difference to pipe, Q39, Q40, Q41, Q42 to input difference to pipe provide bias current, Q43,
Q44 is the active load of current-mirror structure, together constitutes input stage module；Interstage amplifier section is by being connected into common emitter configuration
Q51 and current source triode Q52 is constituted, and used as the main gain stage of the second amplifier, single supply output stage ensures output voltage letter
Number can as little as VEE negative supplies rail, constant current source module is made up of Low Drift Temperature reference current generating circuit and multistage current mirror, is second
Amplifier offer bias currents at different levels, and produce reference current to be supplied to the corresponding Constant current input of the first amplifier by LB1 and LB2 ends
End.
Embodiments of the invention are used for the electric current flowed through on monitoring system bus, and system power is sampled by outer meeting resistance
It is voltage, and amplifies 100 times of outputs.Its common mode input scope up to 100V, with the error of zero it is small, gain accuracy is high,
The features such as gain error is small, gain linearity degree is good, anti-LDR integral dose radiation reaches 100k rad (Si).The circuit is by closing
The line construction design of reason, realizes performance of the circuit maximum input voltage up to 100V on 50V technique platforms, meets height
Pressure application requirement；The circuit has been applied to many money temperature control device nucleus modules, and its electrical parameter and radiation resistance are same better than external
Type circuit.
Claims (8)
1. a kind of high-tension current supervisory circuit, it is characterised in that including the first amplifier and the second amplifier；
First amplifier connection busbar voltage and positive supply are powered, the first amplifier include being connected to busbar voltage and negative supply it
Between bleeder circuit；The in-phase input end and inverting input of the first amplifier are connected to flash by resistance R1 and resistance R2 respectively
The two ends of sampling resistor, the base stage of the output end connection output Darlington transistor of the first amplifier, the partial pressure output end point of the first amplifier
Do not connect the base stage of corresponding partial pressure Darlington transistor, level is associated in the in-phase input end of the first amplifier and defeated to partial pressure Darlington transistor successively
Go out between the colelctor electrode of Darlington transistor, the emitter stage for exporting Darlington transistor is grounded through resistance R3；
The partial pressure output end and positive supply that second amplifier connects the first amplifier are powered；The in-phase input end connection of the second amplifier
Export the emitter stage of Darlington transistor；The inverting input of the second amplifier is grounded through resistance R4 respectively, is transported through resistance R5 connections second
The output end put；The output end output monitoring signal of the second amplifier.
2. a kind of high-tension current supervisory circuit according to claim 1, it is characterised in that the second amplifier is included by Low Drift Temperature
The constant current source module of reference current generating circuit and multistage current mirror composition；The reference current pair that constant current source module output end is produced
Two Constant current input ends of the first amplifier should be connected to, and for the second amplifier provides bias current.
3. a kind of high-tension current supervisory circuit according to claim 2, it is characterised in that the first described amplifier also includes
Constant current bias circuit, input stage circuit and output-stage circuit；
Input stage circuit includes being connected to the in-phase input end of the first amplifier and the input stage differential pair of inverting input, input stage
Differential pair triode connects busbar voltage and powers and constant pressure biasing circuit access reference current respectively；
Each partial pressure output end of bleeder circuit is respectively arranged with three groups of voltage buffer units of parallel connection, and all of first group of voltage delays
Level is associated between the in-phase input end of the first amplifier and output-stage circuit successively to rush unit, all of second group of voltage buffer unit
Level is associated between the inverting input of the first amplifier and output-stage circuit successively, all of 3rd group of voltage buffer unit level successively
It is associated between the input of constant pressure biasing circuit and the first Constant current input end；
Feeder ear connection positive supply and the negative supply of output-stage circuit, reference current end connects the second constant-current supply input, defeated
Go out the first amplifier output end of end connection.
4. a kind of high-tension current supervisory circuit according to claim 3, it is characterised in that constant pressure biasing circuit is through input electricity
Stream mirror connects the first Constant current input end；First amplifier output end connects the second constant-current supply input through current mirror output, defeated
Enter current mirror identical with the ratio of current mirror output.
5. a kind of high-tension current supervisory circuit according to claim 3, it is characterised in that voltage buffer unit is using reaching woods
Pause and manage or MOS multiple tubes composition.
6. a kind of high-tension current supervisory circuit according to claim 1, it is characterised in that the resistance of resistance R1 and resistance R2
It is equal.
7. a kind of high-tension current supervisory circuit according to claim 1, it is characterised in that output Darlington transistor and partial pressure reach
Islington Guan Jun is used with polar form Darlington transistor.
8. a kind of high-tension current supervisory circuit according to claim 1, it is characterised in that described bleeder circuit is by connecting
Diode and multiple resistance composition, the two ends of resistance are respectively provided with partial pressure output end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611056816.1A CN106771476B (en) | 2016-11-25 | 2016-11-25 | A kind of high-tension current monitoring circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611056816.1A CN106771476B (en) | 2016-11-25 | 2016-11-25 | A kind of high-tension current monitoring circuit |
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| CN106771476A true CN106771476A (en) | 2017-05-31 |
| CN106771476B CN106771476B (en) | 2019-04-02 |
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| CN201611056816.1A Active CN106771476B (en) | 2016-11-25 | 2016-11-25 | A kind of high-tension current monitoring circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111458552A (en) * | 2020-04-02 | 2020-07-28 | 世强先进(深圳)科技股份有限公司 | Non-isolated high-side current sampling circuit and direct-current power supply |
| CN112737533A (en) * | 2020-12-21 | 2021-04-30 | 中国兵器装备集团自动化研究所 | High-voltage signal detection preposition conditioning circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111458552A (en) * | 2020-04-02 | 2020-07-28 | 世强先进(深圳)科技股份有限公司 | Non-isolated high-side current sampling circuit and direct-current power supply |
| CN112737533A (en) * | 2020-12-21 | 2021-04-30 | 中国兵器装备集团自动化研究所 | High-voltage signal detection preposition conditioning circuit |
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| CN106771476B (en) | 2019-04-02 |
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