CN208334471U - Two-way anode current sampling module, sample circuit, switching circuit - Google Patents
Two-way anode current sampling module, sample circuit, switching circuit Download PDFInfo
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- CN208334471U CN208334471U CN201820550748.2U CN201820550748U CN208334471U CN 208334471 U CN208334471 U CN 208334471U CN 201820550748 U CN201820550748 U CN 201820550748U CN 208334471 U CN208334471 U CN 208334471U
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Abstract
The utility model provides a kind of two-way anode current sampling module, comprising: the one of resistance R5 terminates the source electrode of the source electrode of PMOS tube MP1, 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, the grid and MP1 of PMOS tube MP3 of the grid connection PMOS tube MP2 of PMOS tube MP1；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 utility model realizes the sampling of two-way high-precision current.The utility model also provides sample circuit, switching circuit.
Description
Technical field
The utility model relates to power IC technical fields, especially a kind of applied to the high-precision of switch type regulator
Spend two-way anode current sample control circuit.
Background technique
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, become power supply
The output voltage or output electric 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 separates, 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 function generated on sampling resistor
Consumption, resistance value generally all obtains 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 requirement 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.
Summary of the invention
The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of two-way anode current sample
Module, and two-way anode current sampling circuit, switching circuit based on two-way anode current sampling module, to solve existing skill
Structure is complicated for sample circuit in art, and precision is lower, while not can guarantee the problem of each output branch current samples consistency.This reality
With novel the technical solution adopted is that:
A kind of two-way anode current sampling module, comprising: 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 one of resistance R5 terminates the source electrode of the source electrode of PMOS tube MP1, the source electrode of PMOS tube MP4, PMOS tube MP5；Resistance R6
One 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, the grid and MP1 of PMOS tube MP3 of pipe MP2；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 pipe MP4
With one end of the drain electrode connecting resistance R8 of MP5, another chip termination of resistance R8；It is fed back for output voltage one end of resistance R8
Signal 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 and the one of load R3 of the other end connection resistance R6 of sampling resistor R2
End；The other end of the other end connection resistance R7 of sampling resistor R1 and one end of load R4；Load another termination of R3 and R4
Ground is also grounded to the chip of two-way anode current sampling module.
A kind of switching circuit, comprising: switching tube M1, rectifying tube M2, inductance L, output capacitance Cout, above-mentioned two-way anode
Current sampling module, sampling resistor R1, R2, feedback resistance R23, R24, load R3, R4, driving circuit, rest-set flip-flop, PWM ratio
Compared with device, 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
Another output connects the grid of 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
The one of pole and one end of inductance L, one end of another termination output capacitance Cout of inductance L and sampling resistor R1 and R2
End；The other end of output capacitance Cout is grounded；Another termination sampling resistor R1 of resistance R5 in two-way anode current sampling module
With one end of R2, the other end of another termination sampling resistor R2 of resistance R6, two-way anode in two-way anode current sampling module
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
Ground connection；The other end of sampling resistor R2 connects one end of feedback resistance R23 and by load R3 ground connection；Feedback resistance R23's is another
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 respectively, level selection circuit is by comparing voltage feedback signal
VSENAnd VFBSize, by VSENAnd VFBIn that biggish signal pass to the inverting input terminal of operational amplifier；Operation amplifier
The homophase input of device terminates reference voltage VREF；The inverting input terminal of the output termination PWM comparator of operational amplifier, PWM compare
The homophase input of device terminates triangular signal Vramp；The end R of the output termination rest-set flip-flop of PWM comparator, the S of rest-set flip-flop
Terminate pulse signal Vpulse；The input terminal of the Q termination driving circuit of RS trigger.
Further, the output end of operational amplifier is also grounded by concatenated compensation resistance R25 and compensating electric capacity C21.
Further, switching tube M1, rectifying tube M2 are NMOS tube.
A kind of current sample method, comprising:
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 anode voltage of sampling resistor common end is detected, to obtain the anode Voltage Feedback letter of characterization output current information
Number；
The negative terminal voltage of sampling resistor in detection the first output branch, to obtain characterization the first output branch output electric 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 electric 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。
Utility model has the advantages 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 achieve 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.
Detailed description of the invention
Fig. 1 is the two-way anode current sampling module and two-way anode current sampling circuit schematic diagram of the utility model.
Fig. 2 is the switching circuit schematic diagram of the utility model.
Fig. 3 is the timing diagram of the constant current/constant voltage operating mode of the switching circuit of the utility model.
Specific embodiment
Below with reference to specific drawings and examples, the utility model is described in further detail.
A kind of high-precision two-way anode current sampling module provided by the utility model and a kind of two-way anode electric current
Sample circuit is as shown in Figure 1；Dotted box portion is two-way anode current sampling module, can be made 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
For 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, with chip structure
At two-way anode current sampling circuit；Wherein, R1 and R2 be respectively two output branch road high precision sampling resistances, R3 and
R4 is the load of two output branch roads respectively；
The one of resistance R5 terminates the source electrode of the source electrode of PMOS tube MP1, the source electrode of PMOS tube MP4, PMOS tube MP5；Resistance R6
One 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, the grid and MP1 of PMOS tube MP3 of pipe MP2；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 pipe MP4
With one end of the drain electrode connecting resistance R8 of MP5, another chip termination of resistance R8；It is fed back for output voltage one end of resistance R8
Signal 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 and the one of load R3 of the other end connection resistance R6 of sampling resistor R2
End；The other end of the other end connection resistance R7 of sampling resistor R1 and one end of load R4；Load another termination of R3 and R4
Ground is also grounded to the chip of two-way anode current sampling module.
The working 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 indicated as shown in figure 1；Since MP1, MP2, MP3 are identical in Fig. 1, ignore channel modulation
Effect, it is assumed that MP4 and MP5 has electric current, then MP1~MP3 works in saturation region, is apparent from conjunction with the saturation region formula of metal-oxide-semiconductor
V4=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 I3It can be any 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 has been only capable of a conducting, another is in an off state, simultaneously turns off the grid connection of state PMOS pipe MP4 or MP5
PMOS tube works 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 work works in saturation region, MP3 in linear zone, and MP4, which leads to alive, to be flowed through, MP5
It is in an 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 high precision sampling resistance both ends biggish branch of 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 to adjust the amplification factor of sample circuit, the resistance of resistance R8 and R5
Type can be used to adjust the temperature coefficient of sample circuit.
As long as by the derivation of equation it is found that guaranteeing 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 that process mismatch bring influences 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 matching degree reduction mismatch bring influence grid width.
To sum up, the current sample method proposed in the utility model, comprising:
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 anode voltage of sampling resistor common end is detected, to obtain the anode Voltage Feedback letter of characterization output current information
Number；
The negative terminal voltage of sampling resistor in detection the first output branch, to obtain characterization the first output branch output electric 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 electric 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 utility model is as shown in Figure 2, comprising: switching tube M1, rectifying tube M2, inductance L, output electricity
Hold 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 comparator 23, operational amplifier 24, level selection circuit 25, compensation resistance R25, compensating electric capacity
C21；Wherein 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
21 another output connects the grid of 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 ground connection；The other end of sampling resistor R2 connects one end of feedback resistance R23 and by load 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 is by comparing Voltage Feedback
Signal VSENAnd VFBSize, by VSENAnd VFBIn that biggish signal pass to the inverting input terminal of operational amplifier 24；Fortune
The homophase input for calculating amplifier 24 terminates reference voltage VREF；The reverse phase of the output termination PWM comparator 23 of operational amplifier 24 is defeated
Enter end, the homophase input of PWM comparator terminates triangular signal Vramp；The R of the output termination rest-set flip-flop 22 of PWM comparator 23
The S at end, rest-set flip-flop 22 terminates pulse signal Vpulse；The input terminal of the Q termination driving circuit 21 of rest-set flip-flop 22.
More preferably, the output end of operational amplifier 24 is also grounded by concatenated compensation resistance R25 and compensating electric capacity C21.
In Fig. 2, VoutFor the anode 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 biggish 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 that biggish signal
The inverting input terminal for passing to operational amplifier 24 participates in the loop control of circuit；Signal VSENGreater 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, the load current perseverance in setting stable always
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 setting of branch.Work as VSENSignal is less than VFBWhen, constant current loop is shielded, and constant pressure loop rises
Effect, output voltage are stable in setting value always.Here output voltage is by reference voltage VREF, feedback resistance R23 and feedback resistance
R24 setting.
The timing diagram of the constant current/constant voltage operating mode provided below with reference to Fig. 3 introduces the working principle of the topology.When t1
Before quarter, the load current i of the first output branchout1Less than constant current point, smaller, the load current of the second output branch is loaded
iout2It 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.t1
The load of the first output branch is switched to constant pressure source, output voltage V suddenly when the momentoutIt is pulled low.V at this timeFBIt reduces in proportion,
Upper tube M1 is controlled by constant pressure loop to be connected for a long time, provides enough energy to output, with the load of the first output branch
Electric current iout1It is gradually increased, the V that two-way anode current sampling module samplesSENVoltage also gradually rises, and works as VSENVoltage is high
In VFBWhen, constant pressure loop is shielded, and constant current loop starts to control entire loop, the load current i of final first output branchout1
Stablize in constant current point, output voltage VoutIt is identical as the constant pressure source load of first output branch.
Although exemplary embodiment describes the utility model for reference, it is to be understood that term used is explanation and shows
Example property, and unrestricted term.Since the utility model can be embodied in a variety of forms without departing from utility model
Spirit or essence, it is to be understood that above-described embodiment is not limited to any of the foregoing details, and should be limited in claim
Spirit and scope in widely understand.Therefore the whole change and modification fallen into claim or its equivalent scope all should be
Appended claims are covered.
Claims (9)
1. a kind of two-way anode current sampling module characterized by comprising 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 one of resistance R5 terminates the source electrode of the source electrode of PMOS tube MP1, 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, the grid and MP1 of PMOS tube MP3 of MP2；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, which is characterized in that including the first output branch, the second output branch, and
Such as two-way anode current sampling module according to any one of claims 1 to 5；First output branch include sampling resistor R1 and
R4 is loaded, 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, and sampling resistor R1 is connected with R2
One end be sampling resistor common end；The other end of the other end connection resistance R6 of sampling resistor R2 and one end of load R3；It adopts
The other end of the other end connection resistance R7 of sample resistance R1 and one end of load R4；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 characterized by comprising output capacitance Cout, switching tube M1, rectifying tube M2, inductance L are such as weighed
Benefit require any one of 1~5 described in a kind of 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 comparator (23), operational amplifier (24), lever 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) another output connects the grid of 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 of resistance R5 samples electricity in two-way anode current sampling module
One end of R1 and R2 is hindered, 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 load 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 obtainedFBRespectively incoming level selection circuit (25), level selection circuit (25) is believed by comparing Voltage Feedback
Number VSENAnd VFBSize, by VSENAnd VFBIn that biggish signal pass to the inverting input terminals of operational amplifier (24)；Fortune
The homophase input for calculating amplifier (24) terminates reference voltage VREF；Output termination PWM comparator (23) of operational amplifier (24)
The homophase input of inverting input terminal, PWM comparator terminates triangular signal Vramp；The output termination RS touching of PWM comparator (23)
The end R of device (22) is sent out, the S of rest-set flip-flop (22) terminates pulse signal Vpulse；The Q of rest-set flip-flop (22) terminates driving circuit (21)
Input terminal.
8. switching circuit as claimed in claim 7, which is characterized in that
The output end of operational amplifier (24) is also grounded by concatenated compensation resistance R25 and compensating electric capacity C21.
9. switching circuit as claimed in claim 7, which is characterized in that
Switching tube M1, rectifying tube M2 are NMOS tube.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108362929A (en) * | 2018-04-18 | 2018-08-03 | 无锡硅动力微电子股份有限公司 | Two-way anode current sampling module, sample circuit, switching circuit and the method for sampling |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108362929A (en) * | 2018-04-18 | 2018-08-03 | 无锡硅动力微电子股份有限公司 | Two-way anode current sampling module, sample circuit, switching circuit and the method for sampling |
| CN108362929B (en) * | 2018-04-18 | 2023-08-15 | 无锡硅动力微电子股份有限公司 | Double-circuit positive-end current sampling module, sampling circuit, switching circuit and sampling method |
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