CN207096859U - A kind of multi thresholds low-voltage detection circuit - Google Patents
A kind of multi thresholds low-voltage detection circuit Download PDFInfo
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- CN207096859U CN207096859U CN201720928302.4U CN201720928302U CN207096859U CN 207096859 U CN207096859 U CN 207096859U CN 201720928302 U CN201720928302 U CN 201720928302U CN 207096859 U CN207096859 U CN 207096859U
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Abstract
The utility model discloses a kind of multi thresholds low-voltage detection circuit, it is related to electronic circuit field, the circuit includes：Signal input part, m control signal end, signal output part, division module, band-gap reference module, resistive control module, comparison module and trigger, the input connection signal input part of division module, the output end connection comparison module of division module, the output end connection comparison module of band-gap reference module, the output end of comparison module connect signal output part by trigger；The output end of the control terminal connection resistive control module of the first variable resistor in division module, each input of resistive control module connect a control signal end respectively；The value of the control signal group of control signal end need to only be changed, it is possible to different low voltage detections is easily selected, so as to meet requirement of the different integrated circuits to low voltage test function.
Description
Technical field
Electronic circuit field is the utility model is related to, especially a kind of multi thresholds low-voltage detection circuit.
Background technology
Integrated circuit refer to using modern semiconductors process technology is process, crystal that to be internally integrated quantity larger
The semiconductor devices such as pipe, resistance capacitance, specific function can be completed and apply a kind of micro-component in contemporary electronic systems.Often
One integrated circuit has been required for an external voltage electric supply installation, and the device must be maintained in certain voltage range
(i.e. each integrated circuit has the supply voltage scope of a steady operation) can normal work, if beyond integrated electricity
The normal working voltage scope on road may cause work disorderly.Conventional external voltage electric supply installation include chemical dry cell,
Lithium battery etc., these batteries need the regular hour when to an integrated circuit, i.e., the supply voltage of integrated circuit from
The supply voltage normal value above freezing for being raised to the circuit needs a process.On the other hand, above battery is using a period of time
Its voltage can be reduced slowly afterwards, therefore its supply voltage often changes integrated circuit in use, it is necessary to ensure that this
The scope of kind change is maintained in the supply voltage regulating scope of the circuit, otherwise circuit internal signal will be caused not know
Or situation about being disagreed with expected results, so that there is maloperation etc. in circuit.
In order to avoid there is abnormal working condition in circuit, it will usually supply voltage is entered using low-voltage detection circuit
Row monitoring in real time, when supply voltage is less than low voltage test virtual value LVDA, alarm is performed, reset and starts backup battery etc.
Operation.Slowly rise (at this moment because supply voltage is very low, therefore low voltage test structure conversely, starting from scratch when supply voltage
Certainly work), when more than low voltage test release value LVDR, low voltage test is released, and circuit enters normal
Working condition.Therefore for some low voltage test structure, its low voltage test value is actual including two values of LVDA, LVDR
To characterize its performance indications.
Low-voltage detection circuit common at present using one kind as shown in figure 1, generally all can embody mains voltage variations
Partial-pressure structure, produce a branch pressure voltage signal, then the input comparator together with reference voltage caused by reference voltage circuit
In be compared, necessary processing is carried out according to comparative result, such as postpones, shaping, then exports corresponding low voltage test
Signal, this low-voltage detection circuit requires very high to reference voltage, simultaneously because it has unique low voltage test value,
Therefore detection limitation is also bigger, and in actual application, it is integrated that may select the chemical dry cell of varying number
Circuit is powered, and when the quantity difference of chemical dry cell, low voltage test value (including LVDA and LVDR) also should be different, it is clear that
The disclosed detection circuits of Fig. 1 can not detect to different low voltage test values, can not be applied to different application scenarios.
Utility model content
The present inventor is regarding to the issue above and technical need, it is proposed that a kind of multi thresholds low-voltage detection circuit, the application
Multigroup low voltage test threshold value can be set, so as to meet requirement of the different integrated circuits to low voltage test function.
The technical solution of the utility model is as follows：
A kind of multi thresholds low-voltage detection circuit, the circuit include：Signal input part, m control signal end, signal output
End, division module, band-gap reference module, resistive control module, comparison module and trigger, it is individual defeated that resistive control module includes m
Enter end and 2mIndividual output end, m are positive integer；
The input connection signal input part of division module, the first voltage of the output end connection comparison module of division module
Input, the second voltage input of the output end connection comparison module of band-gap reference module, the output end connection of comparison module
The input of trigger, the output end connection signal output part of trigger；Division module includes being sequentially connected in series first variable
Resistance, first resistor and second resistance, the input of one end connection division module of the series circuit, other end ground connection, first
Resistance connects the output end of division module, the control terminal connection resistance control mould of the first variable resistor with the common port of second resistance
The output end of block, each input of resistive control module connect a control signal end respectively；Signal input part is used to connect
Supply voltage to be detected, signal output part are used to export low voltage detection, and m control signal end is used to receive at least two
Individual different control signal group, multi thresholds low-voltage detection circuit are defeated by signal when receiving different control signal groups
Go out end and export low voltage detection corresponding with control signal group.
Its further technical scheme is that the first variable resistor includes N number of divider resistance being sequentially connected in series, each partial pressure electricity
Resistance is in parallel with a transmission gate respectively, and the control terminal of each transmission gate connects an output end of resistive control module respectively, 1≤
N≤2mAnd N is integer.
Its further technical scheme is, comparison module includes the first PMOS, the second PMOS, the first NMOS tube and the
Two NMOS tubes, the grid of the first NMOS tube are connected with the grid of the second NMOS tube and are connected the drain electrode of the first NMOS tube, and first
The source electrode of NMOS tube and the source electrode of the second NMOS tube are grounded respectively, and the drain electrode of the first NMOS tube is also connected with the source of the first PMOS
Pole, the first voltage input of the grid connection comparison module of the first PMOS, the drain electrode of the second NMOS tube connect the 2nd PMOS
The source electrode of pipe, the second voltage input of the grid connection comparison module of the second PMOS, the second NMOS tube and the second PMOS
Common port connection comparison module output end；
The drain electrode of first PMOS connects signal input part, the drain electrode of the second PMOS with the 4th resistance by 3rd resistor
Signal input part is connected by the 5th resistance and the 6th resistance, 3rd resistor is identical with the resistance of the 5th resistance, the 4th resistance with
The resistance of 6th resistance is identical, and the 4th resistance is in parallel with a transmission gate, transmission gate also with the 6th resistor coupled in parallel, the control of transmission gate
The output end of connection resistive control module in end processed.
Its further technical scheme is that circuit includes 2 control signal ends, and the first variable resistor is gone here and there successively including 3
The divider resistance of connection；Then resistance control circuit includes first input end, the second input, the first output end, the second output end, the
Three output ends and the 4th output end, the first output end, the second output end and the 3rd output end are respectively used to connection and each partial pressure
The control terminal of the transmission gate of resistor coupled in parallel, the 4th output end are used to connect and the transmission gate of the 4th resistance and the 6th resistor coupled in parallel
Control terminal；
First input end connects the input of the first OR gate, the second OR gate and the 4th and door respectively, and first input end is also logical
Cross that end of oppisite phase connects the first OR gate, the second OR gate and the 3rd connects first and door, the respectively with the input of door, the second input
Two with door, the 3rd with door and the 4th with the input of door, the output end connection first of the first OR gate and the input of door, second or
Output end connection second and the input of door of door, first is connected the first output end with the output end of door, and second and door and the 3rd
The input of the 3rd OR gate is connected respectively with the output end of door, the output end of the 3rd OR gate connects the second output end, and the 4th and door
Output end connect the 3rd output end, first is connected the 4th OR gate respectively with door, the 3rd OR gate and the 4th with the output end of door
Input, the output end of the 4th OR gate connect the 4th output end.
Its further technical scheme is, band-gap reference module include the second adjustable resistance, the 7th resistance, the 8th resistance,
9th resistance, the first triode, the second triode, the tenth resistance, electric capacity and comparator；
7th resistance, the 8th resistance and the 9th resistance are sequentially connected in series, and one end of the series circuit connects the first triode
Emitter stage, the other end connect the emitter stage of the second triode, and the base stage connection colelctor electrode of the first triode is simultaneously grounded, the two or three pole
The base stage connection colelctor electrode of pipe is simultaneously grounded, and the 7th resistance is connected the positive input of comparator with the common port of the first triode,
8th resistance is connected the negative input of comparator, the output end connection band-gap reference mould of comparator with the common port of the 9th resistance
The output end of block；The common port of 7th resistance and the 8th resistance connects the second adjustable resistance, and the other end of the second adjustable resistance connects
Connect the output end of comparator, the output end of comparator is also respectively connected with the tenth resistance and electric capacity, the tenth resistance and electric capacity it is another
End is grounded respectively.
Its further technical scheme is that the second adjustable resistance uses fuse-wires structure, the second adjustable resistance of fuse-wires structure
Including M fuse resistor being sequentially connected in series, each fuse resistor is in parallel with a fuse respectively, the both ends point of each fuse resistor
Not Lian Jie a fuse pressure point, M is positive integer.
Its further technical scheme is that each resistance in band-gap reference module uses temperature compensation structure, and temperature is mended
The resistance of compensation structure includes several thermo-compensator groups being sequentially connected in series, and each thermo-compensator group includes being serially connected
Two compensation resistance and two compensation resistance temperature-coefficient of electrical resistances it is complementary.
Its further technical scheme is that two compensation resistance in each thermo-compensator group are respectively to have negative electricity
Hinder the high resistant polycrystalline resistor of temperature coefficient and the trap resistance with positive temperature coefficient.
Advantageous effects of the present utility model are：
1st, multi thresholds low-voltage detection circuit disclosed in the present application can set multiple low voltage test threshold values, namely have more
Group low voltage test release value LVDR, low voltage test virtual value LVDA can use selection, i.e., need to only change the control of control signal end
The value of signal group processed, it is possible to different LVDR/LVDA values are easily selected, so as to meet that different integrated circuits are examined to low-voltage
The requirement of brake.
2nd, reference voltage is provided using band-gap reference module, the reference voltage for comparing is highly stable, little with electricity
Source voltage and temperature and change；Resistance in other band-gap reference module all employs temperature compensation structure, therefore further subtracts
Small influence of the temperature to reference voltage.
3rd, when integrated circuit processing technique has deviation, can be adjusted using fuse-wires structure so that reference voltage energy
The deviation of integrated circuit processing technique is enough adapted to, improves the precision of low voltage test value.
4th, the first variable resistor carries out selection control using passgate structures, and control method more succinctly facilitates；Second can
Become resistance and use fuse-wires structure, method of adjustment is more accurate, can accurately adjust some Parameters variations caused by process deviation.
Brief description of the drawings
Fig. 1 is the circuit diagram of existing low-voltage detection circuit.
Fig. 2 is the circuit structure diagram of multi thresholds low-voltage detection circuit disclosed in the present application.
Fig. 3 is the circuit diagram of multi thresholds low-voltage detection circuit disclosed in the present application.
Fig. 4 is the circuit diagram of the first variable resistor of passgate structures in the application.
Fig. 5 is the circuit diagram of the resistive control module in the application.
Fig. 6 is the circuit diagram of the band-gap reference module in the application.
Fig. 7 is the circuit diagram of the second adjustable resistance of fuse-wires structure in the application.
Fig. 8 is the circuit diagram for the temperature compensation structure that the resistance in the band-gap reference module in the application uses.
Fig. 9 is the simulation waveform that the reference voltage of the band-gap reference module output in the application varies with temperature.
Figure 10 is the reference voltage of the band-gap reference module output in the application with the simulation waveform of supply voltage.
Figure 11 is simulation result of the application under the control of a control signal group.
Figure 12 is simulation result of the application under the control of another control signal group.
Embodiment
Specific embodiment of the present utility model is described further below in conjunction with the accompanying drawings.
Fig. 2 is refer to, should it illustrates the circuit structure diagram of multi thresholds low-voltage detection circuit disclosed in the utility model
Circuit includes：Vin, m control signal ends of signal input part, signal output part Vout, division module, band-gap reference module, electricity
Hinder control module, comparison module and trigger, trigger can be Schmidt trigger (Schmitt), resistive control module bag
Include m input and 2mIndividual output end, m are positive integer, and for the utility model by taking m=2 as an example, Fig. 2 includes two controls with the circuit
Signal end S processed0And S1Exemplified by, and each output end of resistive control module is not shown respectively by Fig. 2.
The input connection signal input part Vin, signal input part Vin of division module is for connecting power supply electricity to be detected
Pressure, the first voltage input of the output end connection comparison module of division module, supply voltage to be detected pass through division module
Partial pressure after from first voltage input input comparison module, band-gap reference module output end connection comparison module second electricity
Press input, band-gap reference module output reference voltage from second voltage input input comparison module, comparison module it is defeated
Go out the input of end connection trigger, the output end connection signal output part Vout of trigger, comparison module is used for the first electricity
Pressure input and the voltage of second voltage input are compared, then after trigger shaping it is defeated by signal output part Vout
Go out low voltage detection.
Division module includes variable resistor, the output end of the control terminal connection resistive control module of variable resistor, resistance
Each input of control module connects a control signal end respectively.M control signal end is used to receive at least two differences
Control signal group, resistive control module be used for according to the control signal group that receives change in control division module can power transformation
The resistance of resistance, when the resistance of the variable resistor in division module changes, supply voltage to be detected passes through division module
Partial pressure after input comparison module magnitude of voltage it is different, therefore the low voltage detection of the circuit output is also different, Ye Jiduo
Threshold value low-voltage detection circuit passes through signal output part output and control signal group pair when receiving different control signal groups
The low voltage detection answered, realize the selection to different low voltage detections.
It is related to specific circuit structure, the utility model there can be numerous embodiments, typical real with one below
Example is applied to illustrate particular circuit configurations and operation principle of the present utility model.
As shown in figure 3, division module includes the first variable resistor R being sequentially connected in seriesV, first resistor R1And second resistance
R2, the series circuit one end connection division module input, namely connection signal input part Vin, the series circuit it is another
One end is grounded, first resistor R1With second resistance R2Common port connection division module output end, in this application, first electricity
Hinder R1Resistance be 560K Ω, second resistance R2Resistance be 520K Ω.First variable resistor RVHindered using passgate structures
Value regulation, its structure is as shown in figure 4, the first variable resistor RVIncluding N number of divider resistance being sequentially connected in series, each divider resistance point
Not in parallel with a transmission gate, the control terminal of each transmission gate connects an output end of resistive control module respectively, and 1≤N≤
2mAnd N is integer.The utility model is by taking N=3 as an example, the first variable resistor RVIncluding the divider resistance r being sequentially connected in series1、r2And r3,
Each divider resistance is in parallel with a transmission gate, the control terminal CP of three transmission gates1、CP2And CP3Resistance control mould is connected respectively
The output end of block, in this application, r1、r2And r3Resistance be respectively 200K Ω, 240K Ω and 60K Ω.Each transmission gate includes
The drain electrode of PMOS, NMOS tube and phase inverter, PMOS and NMOS tube is connected and connects one end of resistance, PMOS and NMOS tube
Source electrode be connected and connect the other end of resistance, the input of the grid connection phase inverter of PMOS simultaneously connects the control of the transmission gate
End processed, the grid of the output end connection NMOS tube of phase inverter.First variable resistor RVIn each divider resistance whether work
Determined by transmission gate connected in parallel, it can be seen that when the signal of the control terminal of transmission gate is 0, transmission gate conducting,
Divider resistance connected in parallel is short-circuited and not worked, otherwise when the signal of the control terminal of transmission gate is 1, transmission gate is not led
Logical, divider resistance connected in parallel works.With divider resistance r1Exemplified by, as CP1=0,200K Ω divider resistance r1Do not rise
Effect, as CP1=1,200K Ω divider resistance r1Worked in access circuit.
Comparison module includes the first PMOS P1, the second PMOS P2, the first NMOS tube N1 and the second NMOS tube N2, and first
NMOS tube N1 grid is connected with the second NMOS tube N2 grid and is connected the first NMOS tube N1 drain electrode, the first NMOS tube N1's
Source electrode and the second NMOS tube N2 source electrode are grounded respectively, and the first NMOS tube N1 drain electrode is also connected with the first PMOS P1 source electrode,
The first voltage input of first PMOS P1 grid connection comparison module, namely the P1 of the first PMOS grid connection the
One resistance R1With second resistance R2Common port；First PMOS P2 the second PMOS P2 of drain electrode connection source electrode, the 2nd PMOS
The second voltage input of pipe P2 grid connection comparison module, namely the second PMOS P2 grid connection band gap base modules
Output end；Second NMOS tube N2 and the second PMOS P2 common port connect the output end of comparison module, namely connection triggering
The input of device.
In order to aid in adjusting the magnitude of voltage of input comparison module, as shown in figure 3, in the comparison module in the utility model
First PMOS P1 drain electrode passes through 3rd resistor R3With the 4th resistance R4Connect signal input part, the second PMOS P2 drain electrode
Pass through the 5th resistance R5With the 6th resistance R6Connect signal input part, 3rd resistor R3With the 5th resistance R5Resistance it is identical, the 4th
Resistance R4With the 6th resistance R6Resistance it is identical, in this application, 3rd resistor R3, the 5th resistance R5, the 4th resistance R4With the 6th
Resistance R6Resistance be 50K Ω, the 4th resistance R4It is in parallel with a transmission gate, the transmission gate also simultaneously with the 6th resistance R6And
Connection, the output end of the control terminal CP4 connection resistive control modules of the transmission gate.Similarly, the 4th resistance R4With the 6th resistance R6Whether
Work and determined by transmission gate connected in parallel, as CP4=0, transmission gate conducting, the 4th resistance R4With the 6th resistance R6Quilt
Short circuit and do not work, so from two branch roads the first PMOS P1, the second PMOS P2 to signal input part Vin
An only 50K resistance；Otherwise as CP4=1, transmission gate is not turned on, the 4th resistance R4With the 6th resistance R6Access circuit and
Work, so have 100K from two branch roads the first PMOS P1, the second PMOS P2 to signal input part Vin
Resistance.
In this embodiment, m=2, N=3, then resistance control circuit include first input end S0With the second input S1, the
One input S0With the second input S1Respectively with 2 control signal end S of the circuit0And S1It is connected, resistance control circuit also wraps
The first output end CP1, the second output end CP2, the 3rd output end CP3 and the 4th output end CP4 are included, the first output end CP1 is used for
Connection and divider resistance r1The control terminal CP1 of transmission gate in parallel, the second output end CP2 is used to connect and divider resistance r2It is in parallel
Transmission gate control terminal CP2, the 3rd output end CP3 is used to connect and divider resistance r3The control terminal CP3 of transmission gate in parallel,
4th output end CP is used to connect and the 4th resistance R4With the 6th resistance R6The control terminal CP4 of transmission gate in parallel.
The structure of resistance control circuit is as shown in figure 5, first input end S0The first OR gate G is connected respectivelyO1, the second OR gate GO2
With the 4th and door GA4Input, first input end S0The first OR gate G is also connected by end of oppisite phaseO1, the second OR gate GO2With the 3rd
With door GA3Input, the second input S1Connection first and door G respectivelyA1, second with door GA2, the 3rd with door GA3With the 4th with
Door GA4Input, the first OR gate GO1Output end connection first with door GA1Input, the second OR gate GO2Output end connection
Second and door GA2Input, first with door GA1Output end connection the first output end CP1, second with door GA2With the 3rd and door
GA3Output end connect the 3rd OR gate G respectivelyO3Input, the 3rd OR gate GO3Output end connect the second output end CP2, the
Four and door GA4Output end connect the 3rd output end CP3, first with door GA1, the 3rd OR gate GO3With the 4th and door GA4Output end
The 4th OR gate G is connected respectivelyO4Input, the 4th OR gate GO4Output end connect the 4th output end CP4.
Fig. 6 is refer to, it illustrates the circuit diagram of the band-gap reference module in the application, band-gap reference module is integrated electricity
The common One function module in road, it can provide the voltage of the change little with temperature and supply voltage, and the usual voltage is about
For 1.25V, due to close with the band gap voltage value of silicon, so being referred to as bandgap voltage reference (Bandgap Voltage
Reference), due to the parameter of each technique, difference also has difference, actual band gap base plus device size parameter
Quasi- magnitude of voltage and 1.25V have some difference.In this application, the bandgap voltage reference of band-gap reference module output is to input extremely
The reference voltage of comparison module, band-gap reference module include the second adjustable resistance RS, the 7th resistance R7, the 8th resistance R8, the 9th electricity
Hinder R9, the first triode Q0, the second triode Q1, the tenth resistance R10, electric capacity C and comparator IO, in this application, the one or three pole
Pipe Q0For single triode, the second triode Q1It is formed in parallel by 8 triodes；7th resistance R7With the 8th resistance R8Resistance
It is 247.5K Ω, the 9th resistance R9Resistance be 26.5K Ω, the tenth resistance R10Resistance be 240K Ω, electric capacity C capacitance is
3pF。
Wherein, the 7th resistance R7, the 8th resistance R8With the 9th resistance R9It is sequentially connected in series, one end of series circuit connection the
One triode Q0Emitter stage, the other end connect the second triode Q1Emitter stage, the first triode Q0Base stage connection colelctor electrode
And it is grounded, the second triode Q1Base stage connection colelctor electrode and be grounded, the 7th resistance R7With the first triode Q0Common port connection
Comparator IO positive input, the 8th resistance R8With the 9th resistance R9Common port connection comparator IO negative input, than
The output end of output end connection band gap base modules compared with device IO；7th resistance R7With the 8th resistance R8Common port connection second
Variable resistor RS, the second adjustable resistance RSOther end connection comparator IO output end, comparator IO output end also connects respectively
Meet the tenth resistance R10With electric capacity C, the tenth resistance R10It is grounded respectively with the electric capacity C other end.
The second adjustable resistance RSUsing fuse-wires structure, the second adjustable resistance R of fuse-wires structureSM including being sequentially connected in series molten
Silk resistance, each fuse resistor is in parallel with a fuse respectively, and the both ends of each fuse resistor connect a fuse pressure point respectively,
M is positive integer.The second adjustable resistance RSStructure refer to Fig. 7, by taking M=4 as an example, the second adjustable resistance RSIncluding being sequentially connected in series
4 resistance r4、r5、r6And r7, the resistance of this 4 resistance is respectively 4.5K Ω, 9K Ω, 18K Ω and 36K Ω, resistance r4With melting
Silk Fuse1 is in parallel, resistance r5It is in parallel with fuse Fuse2, resistance r6It is in parallel with fuse Fuse3, resistance r7It is in parallel with fuse Fuse4.
Resistance r4One end connection fuse pressure point FPAD1, resistance r4With resistance r5Common port connection fuse pressure point FPAD2, resistance r5With
Resistance r6Common port connection fuse pressure point FPAD3, resistance r6With resistance r7Common port connection fuse pressure point FPAD4, resistance r7
Other end connection fuse pressure point FPAD5.The second adjustable resistance RSBand-gap reference module is exported for correcting technological parameter
The influence of voltage, the mode of amendment is to utilize five fuse pressure points of FPAD1~FPAD5, according to the electrical parameter pair during chip testing
Fuse to tetra- fuse selections of Fuse1~Fuse4, so as to which the reference voltage of output is adjusted near 1.25V..Molten
In silk design process, the adjustment stepping accuracy for the reference voltage that band-gap reference module is exported is designed as 4mV, is measured by experiment
Bandgap voltage reference output accuracy is obtained as 0.32%.
Further, since the resistance in integrated circuit all has temperature characterisitic, i.e. the resistance of resistance can be with temperature
Change and change, the size that resistance changes can be characterized with the temperature coefficient of the resistance, the electricity being generally integrated in circuit
Resistance all has positive temperature coefficient, such as polycrystalline resistor, trap resistance (nwell), active area resistance, with the rise of temperature, this
The resistance of the resistance of type can raise；Also the resistance for having particular type has negative temperature coefficient, such as high resistant polycrystalline resistor
(hpoly), the resistance of such resistance can with temperature rise and reduce.In order to reduce temperature to resistance
Influence, further improve the stability of the voltage of band-gap reference module output, therefore each resistance in band-gap reference module is adopted
With temperature compensation structure, the resistance of temperature compensation structure includes several thermo-compensator groups being sequentially connected in series, each temperature
Compensation resistance group includes two compensation resistance being serially connected and the temperature-coefficient of electrical resistance of two compensation resistance is complementary, in order that warm
It is more preferable to spend the effect of compensation, at least two thermo-compensator groups would generally be used in the resistance of each temperature compensation structure, please
With reference to figure 8, it is so that the resistance of temperature compensation structure includes 2 thermo-compensator groups as an example, optionally, each temperature-compensating electricity
Two compensation resistance in resistance group are respectively the high resistant polycrystalline resistor R with negative temperature coefficient of resistancehpolyWith with positive resistance temperature
Spend the trap resistance R of coefficientnwell, namely the resistance of a temperature compensation structure includes the trap resistance R that is sequentially connected in seriesnwell, high resistant it is more
Brilliant resistance Rhpoly, trap resistance RnwellWith high resistant polycrystalline resistor Rhpoly.In the figure 7, the size (i.e. square number) of resistance is each compensated
R/ (4*R can be designed toWnwell), or R/ (4*RWhpoly), in layout design, above resistance is also using shown in Fig. 7
Compensate the form of resistant series.
As a result of band-gap reference module, it is highly stable to thus be accordingly used in the reference voltage compared, little with power supply electricity
Pressure and temperature and change；Temperature compensation structure is all employed additionally, due to resistance, therefore further reduces temperature to voltage
Influence.In this programme band-gap reference module output reference voltage with temperature simulation waveform as shown in Figure 9, with power supply electricity
The simulation waveform of buckling is as shown in Figure 10；It can be seen that 1.25V reference voltages are highly stable, and temperature drift exists
It is 50ppm/ DEG C or so, highly stable.
The operation principle of multi thresholds low-voltage detection circuit disclosed in the present application is：
Control signal group is received by 2 control signal ends, as control signal group S0And S1Value difference when, in the application
4 transmission gates control terminal CP1~CP4 value it is different, then the conducting state of 4 transmission gates is different, therefore power supply electricity
Input is also different to the magnitude of voltage of comparison module after pressing partial pressure, comparison module to the magnitude of voltage after partial pressure and reference voltage relatively after
The low voltage detection of generation is also different, i.e., supply voltage LVDR, low voltage test when corresponding low voltage test discharges
Supply voltage LVDA values when effectively are different, and control logic and low voltage detection corresponding to different control signal groups are such as
Shown in following table：
| Control signal group | CP4 | CP3 | CP2 | CP1 | LVDR values | LVDA values |
| S0=0, S1=0 | 0 | 0 | 0 | 0 | 2.474 | 2.218 |
| S0=0, S1=1 | 1 | 1 | 0 | 0 | 2.859 | 2.505 |
| S0=1, S1=0 | 1 | 1 | 1 | 0 | 3.289 | 2.935 |
| S0=1, S1=1 | 1 | 1 | 1 | 1 | 3.91 | 3.509 |
S0=0, S1The simulation result of low voltage detection is as shown in figure 11 in the case of=0, S0=1, S1=1 feelings
The simulation result of low voltage detection is as shown in figure 12 under condition, and comparison diagram 11 and Figure 12 are it can also be seen that disclosed in the present application
Multi thresholds low-voltage detection circuit can set multigroup low voltage test threshold value, so as to meet that different integrated circuits are examined to low-voltage
The requirement of brake.
Above-described is only preferred embodiment of the present utility model, and the utility model is not limited to above example.Can
To understand, what those skilled in the art directly exported or associated on the premise of spirit of the present utility model and design is not departed from
Oher improvements and changes, it is considered as being included within the scope of protection of the utility model.
Claims (8)
1. a kind of multi thresholds low-voltage detection circuit, it is characterised in that the circuit includes：Signal input part, m control signal
End, signal output part, division module, band-gap reference module, resistive control module, comparison module and trigger, the resistance control
Molding block includes m input and 2mIndividual output end, m are positive integer；
The input of the division module connects the signal input part, the output end connection relatively mould of the division module
The first voltage input of block, the output end of the band-gap reference module connect the second voltage input of the comparison module,
The output end of the comparison module connects the input of the trigger, and the output end of the trigger connects the signal output
End；The division module includes the first variable resistor, first resistor and the second resistance being sequentially connected in series, and the one of the series circuit
End connects the input of the division module, other end ground connection, and the first resistor connects with the common port of the second resistance
The output end of the division module, the control terminal of first variable resistor connect the output end of the resistive control module, institute
The each input for stating resistive control module connects a control signal end respectively；The signal input part is to be detected for connecting
Supply voltage, the signal output part is used to export low voltage detection, and the m control signal end is used for reception at least
Two different control signal groups, the multi thresholds low-voltage detection circuit pass through when receiving different control signal groups
The signal output part exports low voltage detection corresponding with the control signal group.
2. circuit according to claim 1, it is characterised in that first variable resistor includes N number of point being sequentially connected in series
Piezoresistance, each divider resistance is in parallel with a transmission gate respectively, and the control terminal of each transmission gate connects institute respectively
State an output end of resistive control module, 1≤N≤2mAnd N is integer.
3. circuit according to claim 2, it is characterised in that the comparison module includes the first PMOS, the 2nd PMOS
Pipe, the first NMOS tube and the second NMOS tube, the grid of first NMOS tube are connected and connected with the grid of second NMOS tube
Connect the drain electrode of first NMOS tube, the source electrode of the source electrode of first NMOS tube and second NMOS tube is grounded respectively, institute
The drain electrode for stating the first NMOS tube is also connected with the source electrode of first PMOS, and the grid of first PMOS connects the comparison
The first voltage input of module, the source electrode of drain electrode connection second PMOS of second NMOS tube, described second
The second voltage input of the grid connection comparison module of PMOS, second NMOS tube and second PMOS
Common port connects the output end of the comparison module；
The drain electrode of first PMOS connects the signal input part, the 2nd PMOS with the 4th resistance by 3rd resistor
The drain electrode of pipe connects the signal input part by the 5th resistance and the 6th resistance, the 3rd resistor and the 5th resistance
Resistance is identical, and the 4th resistance is identical with the resistance of the 6th resistance, and the 4th resistance is in parallel with a transmission gate, institute
State transmission gate and also connect the output end of the resistive control module with the 6th resistor coupled in parallel, the control terminal of the transmission gate.
4. circuit according to claim 3, it is characterised in that the circuit includes 2 control signal ends, and described first can
Becoming resistance includes 3 divider resistances being sequentially connected in series；Then the resistance control circuit include first input end, the second input,
First output end, the second output end, the 3rd output end and the 4th output end, first output end, second output end and
3rd output end is respectively used to connect the control terminal of the transmission gate in parallel with each divider resistance, and the 4th output end is used
In connection and the control terminal of the 4th resistance and the transmission gate of the 6th resistor coupled in parallel；
The first input end connects the input of the first OR gate, the second OR gate and the 4th and door, the first input end respectively
The input of first OR gate, second OR gate and the 3rd and door, second input point are also connected by end of oppisite phase
Not Lian Jie first with door, second with door, the described 3rd with door and the described 4th with the input of door, the output of first OR gate
End connection described first and the input of door, the output end of second OR gate connects the described second input with door, described
First is connected first output end with the output end of door, and described second is connected respectively with door and the described 3rd with the output end of door
The input of 3rd OR gate, the output end of the 3rd OR gate connect second output end, the described 4th with the output end of door
The 3rd output end is connected, described first is connected respectively with door, the 3rd OR gate and the described 4th with the output end of door
The input of four OR gates, the output end of the 4th OR gate connect the 4th output end.
5. circuit according to any one of claims 1 to 4, it is characterised in that it is variable that the band-gap reference module includes second
Resistance, the 7th resistance, the 8th resistance, the 9th resistance, the first triode, the second triode, the tenth resistance, electric capacity and comparator；
7th resistance, the 8th resistance and the 9th resistance are sequentially connected in series, described in one end connection of the series circuit
Emitter stage, the other end of first triode connect the emitter stage of second triode, the base stage connection of first triode
Colelctor electrode is simultaneously grounded, and the base stage connection colelctor electrode of second triode is simultaneously grounded, the 7th resistance and the one or three pole
The common port of pipe connects the positive input of the comparator, and the 8th resistance is connected institute with the common port of the 9th resistance
The negative input of comparator is stated, the output end of the comparator connects the output end of the band-gap reference module；Described 7th
Resistance connects the second adjustable resistance, the other end connection institute of the second adjustable resistance with the common port of the 8th resistance
State the output end of comparator, the output end of the comparator is also respectively connected with the tenth resistance and the electric capacity, and the described tenth
The other end of resistance and the electric capacity is grounded respectively.
6. circuit according to claim 5, it is characterised in that the second adjustable resistance uses fuse-wires structure, fuse knot
The second adjustable resistance of structure includes M fuse resistor being sequentially connected in series, each the fuse resistor respectively with a fuse
Parallel connection, the both ends of each fuse resistor connect a fuse pressure point respectively, and M is positive integer.
7. circuit according to claim 5, it is characterised in that each resistance in the band-gap reference module uses temperature
Collocation structure, the resistance of temperature compensation structure include several thermo-compensator groups being sequentially connected in series, and each temperature is mended
Repay two temperature-coefficient of electrical resistance complementations for compensating resistance and described two compensation resistance that resistance group includes being serially connected.
8. circuit according to claim 7, it is characterised in that two compensation electricity in each thermo-compensator group
Resistance is respectively the high resistant polycrystalline resistor with negative temperature coefficient of resistance and the trap resistance with positive temperature coefficient.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720928302.4U CN207096859U (en) | 2017-07-27 | 2017-07-27 | A kind of multi thresholds low-voltage detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720928302.4U CN207096859U (en) | 2017-07-27 | 2017-07-27 | A kind of multi thresholds low-voltage detection circuit |
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| CN207096859U true CN207096859U (en) | 2018-03-13 |
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| CN201720928302.4U Withdrawn - After Issue CN207096859U (en) | 2017-07-27 | 2017-07-27 | A kind of multi thresholds low-voltage detection circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108471225A (en) * | 2018-04-26 | 2018-08-31 | 电子科技大学 | A kind of voltage detecting and controling circuit for by-pass switch |
| CN111537773A (en) * | 2020-06-05 | 2020-08-14 | 北京交通大学 | Voltage detection circuit, controller and electronic equipment |
| CN113320773A (en) * | 2021-05-28 | 2021-08-31 | 浙江中烟工业有限责任公司 | Small bag stay wire detection and diagnosis system and method |
-
2017
- 2017-07-27 CN CN201720928302.4U patent/CN207096859U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108471225A (en) * | 2018-04-26 | 2018-08-31 | 电子科技大学 | A kind of voltage detecting and controling circuit for by-pass switch |
| CN111537773A (en) * | 2020-06-05 | 2020-08-14 | 北京交通大学 | Voltage detection circuit, controller and electronic equipment |
| CN113320773A (en) * | 2021-05-28 | 2021-08-31 | 浙江中烟工业有限责任公司 | Small bag stay wire detection and diagnosis system and method |
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