CN108362929A - Two-way anode current sampling module, sample circuit, switching circuit and the method for sampling - Google Patents
Two-way anode current sampling module, sample circuit, switching circuit and the method for sampling Download PDFInfo
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- CN108362929A CN108362929A CN201810347792.8A CN201810347792A CN108362929A CN 108362929 A CN108362929 A CN 108362929A CN 201810347792 A CN201810347792 A CN 201810347792A CN 108362929 A CN108362929 A CN 108362929A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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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
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The present invention provides a kind of two-way anode current sampling module, including：The source electrode of a termination PMOS tube MP1 of resistance R5, the source electrode of the source electrode of PMOS tube MP4, PMOS tube MP5；The source electrode of a termination PMOS tube MP2 of resistance R6；The source electrode of a termination PMOS tube MP3 of resistance R7；The drain electrode of the grid of the grid connection PMOS tube MP2 of PMOS tube MP1, the grid and MP1 of PMOS tube MP3；The drain electrode of PMOS tube MP1 by current source IS1 with connecing chip, the drain electrode of PMOS tube MP2 by current source IS2 with connecing chip, the drain electrode of PMOS tube MP3 by current source IS2 with connecing chip；The grid of PMOS tube MP4 connects the drain electrode of PMOS tube MP2, and the grid of PMOS tube MP5 connects the drain electrode of PMOS tube MP3；One end of the drain electrode connecting resistance R8 of PMOS tube MP4 and MP5, another chip termination of resistance R8；One end of resistance R8 is used for output voltage feedback signal VSEN.The present invention realizes the sampling of two-way high-precision current.
Description
Technical field
It is double that the present invention relates to power IC technical field, especially a kind of high-precisions applied to switch type regulator
Road anode current sample control circuit.
Background technology
Supply convertor is widely used in various electronic equipments, its effect is exactly by power supply from a kind of formal argument
To another form.Supply convertor is mainly made of power stage circuit and control loop.Control loop be in input voltage and
When external load changes, by the turn-on and turn-off time of switching tube and rectifying tube in regulation power grade circuit, power supply is made to become
The output voltage or output current of parallel operation keep stablizing.Therefore load current can precisely be sampled it is particularly significant, show
Current sampling technique be mainly test sample resistance both ends voltage difference, sampling resistor can be the conducting of power tube itself
The precision resister that resistance either detaches, since the conducting resistance fluctuation of power tube itself is larger, so being wanted in many precision
Higher occasion is asked usually to choose the precision resister of separation as sampling resistor.In order to reduce the work(generated on sampling resistor
Consumption, resistance value generally all obtain very little, such as 20 milliohms, therefore the pressure difference at sampling resistor both ends also very little, so power supply chip
Inside, which needs to design high-precision amplifier, could improve sampling precision.Under the conditions of how solving wide scope common-mode voltage simultaneously
Precisely sampling is also a problem.As present application environment and safety require to become increasingly complex, a chips can be gathered around simultaneously
There is the output of two-way even more multichannel, how to solve to the accurate sampling under the conditions of the wider common-mode voltage of multiple-channel output realization
Increasingly become a urgent need to solve the problem.
Invention content
It is an object of the present invention to overcome the shortcomings of the prior art and provide a kind of two-way anode current sample moulds
Block, and two-way anode current sampling circuit, switching circuit based on two-way anode current sampling module, to solve the prior art
Middle sample circuit is complicated, and precision is relatively low, while can not ensure the problem of each output branch current samples consistency.The present invention
The technical solution adopted is that：
A kind of two-way anode current sampling module, including：Resistance value identical resistance R5, R6, R7, identical PMOS tube MP1,
MP2, MP3, identical PMOS tube MP4 and MP5, resistance R8, electric current equal current source IS1, IS2, IS3；
The source electrode of a termination PMOS tube MP1 of resistance R5, the source electrode of the source electrode of PMOS tube MP4, PMOS tube MP5；Resistance R6
A termination PMOS tube MP2 source electrode；The source electrode of a termination PMOS tube MP3 of resistance R7；The grid of PMOS tube MP1 connects PMOS
The drain electrode of the grid of pipe MP2, the grid and MP1 of PMOS tube MP3；The drain electrode of PMOS tube MP1 connects chip by current source IS1
Ground, the drain electrode of PMOS tube MP2 by current source IS2 with connecing chip, the drain electrode of PMOS tube MP3 by current source IS2 with connecing chip；
The grid of PMOS tube MP4 connects the drain electrode of PMOS tube MP2, and the grid of PMOS tube MP5 connects the drain electrode of PMOS tube MP3；PMOS tube MP4 and
One end of the drain electrode connecting resistance R8 of MP5, another chip termination of resistance R8；One end of resistance R8 is used for output voltage feedback letter
Number VSEN。
Further, PMOS tube MP1, MP2, MP3 is low pressure PMOS tube.
Further, PMOS tube MP4 and MP5 is thin grid oxygen high voltage PMOS pipe.
Further, the grid length of PMOS tube MP1, MP2, MP3 is 5 μm or more.
Further, the grid width of PMOS tube MP1, MP2, MP3 is 5 μm or more.
A kind of two-way anode current sampling circuit, including the first output branch, the second output branch and above-mentioned two-way
Anode current sampling module；First output branch includes sampling resistor R1 and load R4, and the second output branch includes sampling resistor
R2 and load R3；
One end of sampling resistor R1 and R2 link together, and connect the other end of resistance R5, sampling resistor R1 and R2 phase
One end of connection is sampling resistor common end；The other end of the other end connection resistance R6 of sampling resistor R2 and the one of load R3
End；One end of the other end and load R4 of the other end connection resistance R7 of sampling resistor R1；The other end ground connection of R3 and R4 is loaded,
Also it is grounded to the chip of two-way anode current sampling module.
A kind of switching circuit, including：Switching tube M1, rectifying tube M2, inductance L, output capacitance Cout, such as Claims 1 to 5
Any one of described in two-way anode current sampling module, sampling resistor R1, R2, feedback resistance R23, R24, load R3, R4, drive
Dynamic circuit, rest-set flip-flop, PWM comparators, operational amplifier, level selection circuit；
The drain electrode of switching tube M1 meets input voltage signal VIN, grid connects an output end of driving circuit, driving circuit
The grid of another output termination rectifying tube M2；The source electrode of rectifying tube M2 is grounded；The source electrode of switching tube M1 connects the leakage of rectifying tube M2
Pole and one end of inductance L, one end of another termination output capacitance Cout of inductance L and one end of sampling resistor R1 and R2；
The other end of output capacitance Cout is grounded；Another termination the sampling resistor R1 and R2 of resistance R5 in two-way anode current sampling module
One end, the other end of another termination sampling resistor R2 of resistance R6, two-way anode electric current in two-way anode current sampling module
The other end of another termination sampling resistor R1 of resistance R7 in sampling module；The other end of sampling resistor R1 is connect by loading R4
Ground；The other end of sampling resistor R2 connects one end of feedback resistance R23 and by loading R3 ground connection；The other end of feedback resistance R23
It is grounded by feedback resistance R24；The chip of two-way anode current sampling module it is grounded；
The voltage feedback signal V obtained from two-way anode current sampling moduleSENSection is connected with from feedback resistance R23, R24
The voltage feedback signal V that point obtainsFBIncoming level selection circuit respectively, level selection circuit is by comparing voltage feedback signal
VSENAnd VFBSize, by VSENAnd VFBIn larger that signal pass to the inverting input of operational amplifier；Operation amplifier
The homophase input termination reference voltage V of deviceREF；The inverting input of the output termination PWM comparators of operational amplifier, PWM compare
The homophase input termination triangular signal V of deviceramp；The ends R of the output termination rest-set flip-flop of PWM comparators, the ends S of rest-set flip-flop
Meet pulse signal Vpulse；The input terminal of the Q termination driving circuits of rest-set flip-flop.
Further, the output end of operational amplifier also passes through concatenated compensation resistance R25 and compensating electric capacity C21 ground connection.
Further, switching tube M1, rectifying tube M2 are NMOS tube.
A kind of current sample method, including：
Two output branches, including the first output branch, the second output branch are set；First output branch includes concatenated
Sampling resistor R1 and load R4, the second output branch include concatenated sampling resistor R2 and load R3；Sampling resistor R1's and R2
One end is connected together as sampling resistor common end；
The positive terminal voltage for detecting sampling resistor common end, the anode Voltage Feedback to obtain characterization output current information are believed
Number；
The negative terminal voltage of sampling resistor in detection the first output branch, to obtain characterization the first output branch output current letter
The negative terminal voltage feedback signal of breath；
The negative terminal voltage of sampling resistor in detection the second output branch, to obtain characterization the second output branch output current letter
The negative terminal voltage feedback signal of breath；
It is propped up by comparing the Voltage Feedback pressure difference signal on sampling resistor in two output branches, and by the larger output of pressure difference
The output current information on road is converted to voltage feedback signal VSEN。
The advantage of the invention is that：
1) it ensure that two-way just using the crash consistency of first detection branch circuit and Article 2 detection branch circuit
Hold the consistency of current sample；High-precision two-way anode current sampling circuit can be achieved.
2) common-mode voltage range of high-precision two-way anode current sampling circuit can reach 1.8V to input voltage.
3) it only needs to replicate in Article 2 detection branch circuit in two-way anode current sampling module, can easily expand
To three tunnels or more detection branch, to realize high-precision multichannel anode current sample.
Description of the drawings
Fig. 1 is the two-way anode current sampling module and two-way anode current sampling circuit schematic diagram of the present invention.
Fig. 2 is the switching circuit schematic diagram of the present invention.
Fig. 3 is the sequence diagram of the constant current/constant voltage operating mode of the switching circuit of the present invention.
Specific implementation mode
With reference to specific drawings and examples, the invention will be further described.
A kind of high-precision two-way anode current sampling module provided by the invention and a kind of two-way anode current sample
Circuit is as shown in Figure 1；Dotted box portion is two-way anode current sampling module, can make a chip；
Two-way anode current sampling module includes resistance value identical resistance R5, R6, R7, identical PMOS tube MP1, MP2,
MP3, identical PMOS tube MP4 and MP5, resistance R8, electric current equal current source IS1, IS2, IS3；Wherein MP1, MP2, MP3 are
Low pressure PMOS tube, MP4 and MP5 are thin grid oxygen high voltage PMOS pipe；It is the peripheral components of chip outside dotted line frame, is constituted with chip double
Road anode current sampling circuit；Wherein, R1 and R2 is the high precision sampling resistance of two output branch roads, R3 and R4 difference respectively
It is the load of two output branch roads；
The source electrode of a termination PMOS tube MP1 of resistance R5, the source electrode of the source electrode of PMOS tube MP4, PMOS tube MP5；Resistance R6
A termination PMOS tube MP2 source electrode；The source electrode of a termination PMOS tube MP3 of resistance R7；The grid of PMOS tube MP1 connects PMOS
The drain electrode of the grid of pipe MP2, the grid and MP1 of PMOS tube MP3；The drain electrode of PMOS tube MP1 connects chip by current source IS1
Ground, the drain electrode of PMOS tube MP2 by current source IS2 with connecing chip, the drain electrode of PMOS tube MP3 by current source IS2 with connecing chip；
The grid of PMOS tube MP4 connects the drain electrode of PMOS tube MP2, and the grid of PMOS tube MP5 connects the drain electrode of PMOS tube MP3；PMOS tube MP4 and
One end of the drain electrode connecting resistance R8 of MP5, another chip termination of resistance R8；One end of resistance R8 is used for output voltage feedback letter
Number VSEN；The electric current of current source IS1, IS2, IS3 are I1；
A kind of high-precision two-way anode current sampling circuit, including the first output branch, the second output branch, Yi Jishang
State two-way anode current sampling module；First output branch includes sampling resistor R1 and load R4, and the second output branch includes adopting
Sample resistance R2 and load R3；
One end of sampling resistor R1 and R2 link together, and connect the other end of resistance R5, sampling resistor R1 and R2 phase
One end of connection is sampling resistor common end；The other end of the other end connection resistance R6 of sampling resistor R2 and the one of load R3
End；One end of the other end and load R4 of the other end connection resistance R7 of sampling resistor R1；The other end ground connection of R3 and R4 is loaded,
Also it is grounded to the chip of two-way anode current sampling module.
The operation principle and correlation formula that will be explained below the high-precision two-way anode current sampling circuit derive.Respectively
The electric current of the voltage of node and each branch is as marked in Fig. 1；Since MP1, MP2, MP3 are identical in Fig. 1, ignore channel modulation effect
It answers, it is assumed that MP4 and MP5 has electric current, then MP1~MP3 is operated in saturation region, and V4 is apparent from conjunction with the saturation region formula of metal-oxide-semiconductor
=V5=V6, while obtaining following equation：
V1-(I1+I2+I3)*R5=V2-I1*R6 (1)
V1-(I1+I2+I3)*R5=V3-I1*R7 (2)
Due to R5=R6=R7, therefore acquire：
V1-V2=(I2+I3)*R5 (3)
V1-V3=(I2+I3)*R5 (4)
Work as V1-V2And V1-V3When equal, I2And I3Can be arbitrary combination, it is assumed that I3=0, then：
Work as V1-V2And V1-V3When unequal, assume that MP4 and MP5 has electric current incorrect in conjunction with known to formula (3) and (4),
The two is only capable of there are one conducting, another is off state, simultaneously turns off the grid connection of state PMOS tube MP4 or MP5
PMOS tube is operated in linear zone.Reasoning is apparent from V1-V2And V1-V3The corresponding PMOS tube MP4 or MP5 of the middle larger output branch of pressure difference
Conducting.Such as V1-V2＞ V1-V3, then MP2 be operated in saturation region, MP3 is operated in linear zone, and MP4, which leads to alive, to be flowed through, MP5
It is off state, i.e. I3=0, then
It is comprehensive to be analyzed above and formula (5) and formula (6) are it is found that the two-way anode current sampling module in dotted line frame
Relatively to screen the larger branch of high precision sampling resistance both ends pressure difference in two output branches, and load current is believed
Number it is converted into voltage feedback signal VSENIt is transmitted to next module, the ratio of R8 and R5 are the amplification factor of load current signal,
The sampling formula of the two-way anode current sampling module is as follows：
Wherein the ratio of resistance R8 and R5 can be used for adjusting the amplification factor of sample circuit, the resistance class of resistance R8 and R5
Type can be used for adjusting the temperature coefficient of sample circuit.
As long as by the derivation of equation it is found that ensureing first detection branch circuit (R6, MP2, IS2 and MP4) and Article 2 inspection
The absolute matches of subcircuits (R7, MP3, IS3 and MP5) are surveyed, which can realize completely
Equal current sample coefficient, so really also needing to consider the influence that process mismatch is brought in design process.In view of work
In skill production process, the state modulator of low-voltage device is easier than high tension apparatus very much, higher precision may be implemented, so the electricity
MP1~MP3 in road is all made of low-voltage tube, in order to further weaken the grid length suggestion for influencing MP1~MP3 of channel modulation effect
Get 5 μm or more；Also suggest getting 5 μm or more to improve the influence grid width that matching degree reduction mismatch is brought.
To sum up, the current sample method proposed in the present invention, including：
Two output branches, including the first output branch, the second output branch are set；First output branch includes sampling electricity
R1 and load R4 are hindered, the second output branch includes sampling resistor R2 and load R3；One end of sampling resistor R1 and R2 are connected to one
It rises and is used as sampling resistor common end；Sampling resistor R1 connects with load R4, and sampling resistor R2 connects with load R3；
The positive terminal voltage for detecting sampling resistor common end, the anode Voltage Feedback to obtain characterization output current information are believed
Number；
The negative terminal voltage of sampling resistor in detection the first output branch, to obtain characterization the first output branch output current letter
The negative terminal voltage feedback signal of breath；
The negative terminal voltage of sampling resistor in detection the second output branch, to obtain characterization the second output branch output current letter
The negative terminal voltage feedback signal of breath；
It is propped up by comparing the Voltage Feedback pressure difference signal on sampling resistor in two output branches, and by the larger output of pressure difference
The output current information on road is converted to voltage feedback signal VSEN, it is transmitted to next stage and realizes overcurrent protection either constant current function；
Switching circuit provided by the invention is as shown in Fig. 2, include：Switching tube M1, rectifying tube M2, inductance L, output capacitance
Cout, two-way anode current sampling module, sampling resistor R1, R2, feedback resistance R23, R24, load R3, R4, driving circuit 21,
Rest-set flip-flop 22, PWM comparators 23, operational amplifier 24, level selection circuit 25, compensation resistance R25, compensating electric capacity C21；Its
Middle switching tube M1, rectifying tube M2 are NMOS tube, and rest-set flip-flop 22 is that high level input is effective；
The drain electrode of switching tube M1 meets input voltage signal VIN, grid connects an output end of driving circuit 21, driving circuit
The grid of 21 another output termination rectifying tube M2；The source electrode of rectifying tube M2 is grounded；The source electrode of switching tube M1 meets rectifying tube M2
Drain electrode and inductance L one end, one end of another termination output capacitance Cout of inductance L and sampling resistor R1's and R2
One end；The other end of output capacitance Cout is grounded；Another termination sampling resistor of resistance R5 in two-way anode current sampling module
One end of R1 and R2, the other end of another termination sampling resistor R2 of resistance R6 in two-way anode current sampling module, two-way is just
Hold the other end of another termination sampling resistor R1 of resistance R7 in current sampling module；The other end of sampling resistor R1 passes through load
R4 is grounded；The other end of sampling resistor R2 connects one end of feedback resistance R23 and by loading R3 ground connection；Feedback resistance R23's is another
One end is grounded by feedback resistance R24；The chip of two-way anode current sampling module it is grounded；
The voltage feedback signal V obtained from two-way anode current sampling moduleSENSection is connected with from feedback resistance R23, R24
The voltage feedback signal V that point obtainsFBIncoming level selection circuit 25 respectively, level selection circuit 25 are believed by comparing Voltage Feedback
Number VSENAnd VFBSize, by VSENAnd VFBIn larger that signal pass to the inverting input of operational amplifier 24；Operation
The homophase input termination reference voltage V of amplifier 24REF；The anti-phase input of the output termination PWM comparators 23 of operational amplifier 24
End, the homophase input termination triangular signal V of PWM comparatorsramp；The R of the output termination rest-set flip-flop 22 of PWM comparators 23
End, the S termination pulse signals V of rest-set flip-flop 22pulse；The input terminal of the Q termination driving circuits 21 of rest-set flip-flop 22.
More preferably, the output end of operational amplifier 24 also passes through concatenated compensation resistance R25 and compensating electric capacity C21 ground connection.
In fig. 2, VoutFor the positive terminal voltage of sampling resistor common end, VSEN1For sampling resistor R1 in the first output branch
Negative terminal voltage, VSEN2For the negative terminal voltage of sampling resistor R2 in the second output branch, two-way anode current sampling module passes through
Compare Vout-VSEN1And Vout-VSEN2The larger value of difference is converted into voltage feedback signal V afterwardsSEN；It is transmitted to level selection circuit
25, level selection circuit 25 is by comparing voltage feedback signal VSENAnd VFBSize, by VSENAnd VFBIn larger that signal
The inverting input for passing to operational amplifier 24 participates in the loop control of circuit；Signal VSENMore than VFBWhen, constant pressure loop is (anti-
The loop at 25 place feed resistance R23, R24 and level selection circuit) it is shielded, (sampling resistor R1, R2, two-way is just for constant current loop
Loop where end current sampling module and level selection circuit 25) it works, load current stablizes always the perseverance in setting
Flow point.Here constant current point is by the high precision sampling resistance R1 of two-way anode current sampling module and first output branch, second
Item exports the high precision sampling resistance R2 settings of branch.Work as VSENSignal is less than VFBWhen, constant current loop is shielded, and constant pressure loop rises
Effect, output voltage are stablized in setting value always.Here output voltage is by reference voltage VREF, feedback resistance R23 and feedback resistance
R24 is set.
The sequence diagram of the constant current/constant voltage operating mode provided with reference to Fig. 3 introduces the operation principle of the topology.The t1 moment
Before, the load current i of the first output branchout1Less than constant current point, load is smaller, the load current i of the second output branchout2
It is 0.The V that two-way anode current sampling module samples at this timeSENVoltage is smaller, is less than VFB, constant current loop shielded, constant pressure
Loop works, VFBLevel is stablized by the adjustment of constant pressure loop in reference voltage VREFUp and down, output voltage VoutIt is constant.The t1 moment
When first output branch load be switched to constant pressure source, output voltage V suddenlyoutIt is pulled low.V at this timeFBIt reduces, passes through in proportion
Constant pressure loop controls upper tube M1 and is connected for a long time, and enough energy are provided to output, with the load current of the first output branch
iout1Gradually increase, the V that two-way anode current sampling module samplesSENVoltage also gradually rises, and works as VSENVoltage is higher than VFB
When, constant pressure loop is shielded, and constant current loop starts to control entire loop, the load current i of final first output branchout1Stablize
In constant current point, output voltage VoutIt is identical as the constant pressure source load of first output branch.
Although with reference to exemplary embodiment describing the present invention, it is to be understood that term used is explanation and exemplary
, and unrestricted term.Due to the present invention spirit or essence that can be embodied in a variety of forms without departing from invention,
It is to be understood that above-described embodiment is not limited to any details above-mentioned, and should be in the spirit and scope defined by claim
It is extensive to understand.Therefore the whole variations and remodeling fallen into claim or its equivalent scope all should be appended claims institute
Cover.
Claims (10)
1. a kind of two-way anode current sampling module, which is characterized in that including：Resistance value identical resistance R5, R6, R7, it is identical
PMOS tube MP1, MP2, MP3, identical PMOS tube MP4 and MP5, resistance R8, electric current equal current source IS1, IS2, IS3；
The source electrode of a termination PMOS tube MP1 of resistance R5, the source electrode of the source electrode of PMOS tube MP4, PMOS tube MP5；The one of resistance R6
Terminate the source electrode of PMOS tube MP2；The source electrode of a termination PMOS tube MP3 of resistance R7；The grid of PMOS tube MP1 connects PMOS tube
The drain electrode of the grid of MP2, the grid and MP1 of PMOS tube MP3；The drain electrode of PMOS tube MP1 by current source IS1 with connecing chip,
The drain electrode of PMOS tube MP2 by current source IS2 with connecing chip, the drain electrode of PMOS tube MP3 by current source IS2 with connecing chip；
The grid of PMOS tube MP4 connects the drain electrode of PMOS tube MP2, and the grid of PMOS tube MP5 connects the drain electrode of PMOS tube MP3；PMOS tube MP4 and
One end of the drain electrode connecting resistance R8 of MP5, another chip termination of resistance R8；One end of resistance R8 is used for output voltage feedback letter
Number VSEN。
2. two-way anode current sampling module as described in claim 1, which is characterized in that
PMOS tube MP1, MP2, MP3 are low pressure PMOS tube.
3. two-way anode current sampling module as described in claim 1, which is characterized in that
PMOS tube MP4 and MP5 are thin grid oxygen high voltage PMOS pipe.
4. two-way anode current sampling module as described in claim 1, which is characterized in that
The grid length of PMOS tube MP1, MP2, MP3 are 5 μm or more.
5. two-way anode current sampling module as described in claim 1, which is characterized in that
The grid width of PMOS tube MP1, MP2, MP3 are 5 μm or more.
6. a kind of two-way anode current sampling circuit, including the first output branch, the second output branch, and such as claim 1
Two-way anode current sampling module described in any one of~5；First output branch include sampling resistor R1 and load R4, second
Output branch includes sampling resistor R2 and load R3；
One end of sampling resistor R1 and R2 link together, and connect the other end of resistance R5, and sampling resistor R1 is connected with R2
One end be sampling resistor common end；One end of the other end and load R3 of the other end connection resistance R6 of sampling resistor R2；It adopts
One end of the other end and load R4 of the other end connection resistance R7 of sample resistance R1；Load the other end ground connection of R3 and R4, two-way
Also it is grounded to the chip of anode current sampling module.
7. a kind of switching circuit, which is characterized in that including：Switching tube M1, rectifying tube M2, inductance L, output capacitance Cout, are such as weighed
Profit requires two-way anode current sampling module described in any one of 1~5, sampling resistor R1, R2, feedback resistance R23, R24, negative
Carry R3, R4, driving circuit (21), rest-set flip-flop (22), PWM comparators (23), operational amplifier (24), level selection circuit
(25)；
The drain electrode of switching tube M1 meets input voltage signal VIN, grid connects an output end of driving circuit (21), driving circuit
(21) grid of another output termination rectifying tube M2；The source electrode of rectifying tube M2 is grounded；The source electrode of switching tube M1 connects rectifying tube
The drain electrode of M2 and one end of inductance L, one end of another termination output capacitance Cout of inductance L and sampling resistor R1 and R2
One end；The other end of output capacitance Cout is grounded；Another termination sampling electricity of resistance R5 in two-way anode current sampling module
The one end for hindering R1 and R2, the other end of another termination sampling resistor R2 of resistance R6, two-way in two-way anode current sampling module
The other end of another termination sampling resistor R1 of resistance R7 in anode current sampling module；The other end of sampling resistor R1 passes through negative
Carry R4 ground connection；The other end of sampling resistor R2 connects one end of feedback resistance R23 and by loading R3 ground connection；Feedback resistance R23's
The other end is grounded by feedback resistance R24；The chip of two-way anode current sampling module it is grounded；
The voltage feedback signal V obtained from two-way anode current sampling moduleSENIt is obtained with from feedback resistance R23, R24 connecting node
The voltage feedback signal V obtainedFBIncoming level selection circuit (25) respectively, level selection circuit (25) are believed by comparing Voltage Feedback
Number VSENAnd VFBSize, by VSENAnd VFBIn larger that signal pass to the inverting inputs of operational amplifier (24)；Fortune
Calculate the homophase input termination reference voltage V of amplifier (24)REF；The output termination PWM comparators (23) of operational amplifier (24)
Inverting input, the homophase input termination triangular signal V of PWM comparatorsramp；The output termination RS of PWM comparators (23) is touched
Send out the ends R of device (22), the S termination pulse signals V of rest-set flip-flop (22)pulse；The Q termination driving circuits (21) of rest-set flip-flop (22)
Input terminal.
8. switching circuit as claimed in claim 7, which is characterized in that
The output end of operational amplifier (24) also passes through concatenated compensation resistance R25 and compensating electric capacity C21 ground connection.
9. switching circuit as claimed in claim 7, which is characterized in that
Switching tube M1, rectifying tube M2 are NMOS tube.
10. a kind of current sample method, which is characterized in that including：
Two output branches, including the first output branch, the second output branch are set；First output branch includes concatenated sampling
Resistance R1 and load R4, the second output branch include concatenated sampling resistor R2 and load R3；One end of sampling resistor R1 and R2
It is connected together as sampling resistor common end；
The positive terminal voltage for detecting sampling resistor common end, to obtain the anode voltage feedback signal of characterization output current information；
The negative terminal voltage of sampling resistor in detection the first output branch, to obtain characterization the first output branch output current information
Negative terminal voltage feedback signal；
The negative terminal voltage of sampling resistor in detection the second output branch, to obtain characterization the second output branch output current information
Negative terminal voltage feedback signal；
By comparing the Voltage Feedback pressure difference signal on sampling resistor in two output branches, and by the larger output branch of pressure difference
Output current information is converted to voltage feedback signal VSEN。
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| CN112881856A (en) * | 2021-01-11 | 2021-06-01 | 上海交通大学 | Reconfigurable multi-mode sensor interface circuit |
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| CN108362929B (en) | 2023-08-15 |
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