CN105958632A - Power supply switching circuit and signal transmission method - Google Patents
Power supply switching circuit and signal transmission method Download PDFInfo
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- CN105958632A CN105958632A CN201610423151.7A CN201610423151A CN105958632A CN 105958632 A CN105958632 A CN 105958632A CN 201610423151 A CN201610423151 A CN 201610423151A CN 105958632 A CN105958632 A CN 105958632A
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- pmos
- comparator
- power supply
- nmos tube
- circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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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
- H03K17/30—Modifications for providing a predetermined threshold before switching
- H03K17/302—Modifications for providing a predetermined threshold before switching in field-effect transistor switches
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- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
Abstract
The invention discloses a power supply switching circuit. The power supply switching circuit comprises a comparator, a first phase inverter, a second phase inverter, a first buffer, a second buffer, a first PMOS switch tube, a second PMOS switch tube, a third PMOS switch tube and a fourth PMOS switch tube, wherein the comparator comprises a resistor series-connection sampling circuit of an off-chip input power supply, a bias current generation circuit, a comparator body, and a resistor series-connection sampling circuit of a backup power supply. The invention also discloses a signal transmission method for the power supply switching circuit. By adoption of the power supply switching circuit and the signal transmission method, the following technical effects are achieved: 1, an accurate switching threshold value is realized; the switching logic is obtained by determining the high-low level of the off-chip input power supply and the backup power supply; and 2, reliability of the power supply switching is achieved as well; and due to the positive and negative feedback circuits provided by the invention, the shaking and instability of the overall power supply switching circuit caused by shaking of the comparator output due to the fact that the power supply voltage is close to the threshold value point can be avoided.
Description
Technical field
The present invention relates to power supply switch circuit, particularly relate to the power supply switch circuit of SOC and the MCU class circuit of battery standby
And signal transfer method.
Background technology
In the chip much needing standby mode designs, battery life is the index have to carefully studied and consider,
Such as a lot of SOC and MCU chip there is RTC (real time clock) standby clocking capability.In order to improve battery life,
In addition to the power consumption of its load circuit itself needs to reduce, power supply switching timely and effectively is also necessary.Such as in start
In the case of, in the case of i.e. chip has external power source input, the RTC block power supply in chip is switched to off-chip input power；?
In the case of off-chip input power removes, the power supply of RTC block is switched to battery supply more automatically timely.
Existing power supply switch circuit or the most coarse, it is impossible to set the threshold value of power supply switching, or switching threshold is solid
Fixed, cause power supply switch circuit to shake, even cause the entanglement of idle function module logic.
The parallel diode power supply switch circuit used such as the most a lot of companies sees accompanying drawing 1, at off-chip input power
When VDDIN is more than reserve battery BATT voltage.Power selection circuit select off-chip input power VDDIN as RTC or other
The power supply of standby module, when VDDIN removes or VDDIN is less than BATT voltage, power selection circuit selects BATT power supply to make
For RTC or the power supply of other standby module.The defect that this framework is the most fatal is that being not applied for VDDIN is inherently less than
The application scenario of BATT, the normal 3.0V of such as BATT voltage, and chip requires that VDDIN remains a need for when 2.5V normally working.And
This diode power source selects framework that the power supply of the standby module such as RTC can be chosen as BATT in this applications automatically, thus contracts
Short battery life.Additionally the pressure drop of diode self also can increase power consumption or reduce cell voltage usable range.
For diode power source switching architecture, when off-chip input power VDDIN is less than reserve battery BATT, framework can be certainly
The dynamic BATT of selection inputs as power supply, and this is the most fatal for the application scenario of low-voltage.For example, current button cell electricity
Pressure generally 3.0V, and the low voltage operating scope of present a lot of SOC and MCU circuit requirements explores downward to about 2.0V.At this
Planting in application scenario, diode power source selection circuit significant discomfort is used.Additionally also can greatly reduce can in the pressure drop of diode self
Use battery voltage range.
Another power supply switch circuit sees accompanying drawing 2 for switch Switching power selection circuit, two poles that this circuit solves
Tube voltage drop problem, but the most it is not fully solved power supply switching threshold problem.Such as at the off-chip input power of normal 3.3V
In VDDIN power domain, even if when VDDIN is reduced to 1.5V, the power supply switching judging circuit of gate composition may still can
Think that VDDIN is effective.
In switch Switching power selection circuit, the threshold value of power supply switching is unreasonable, and this power supply switch circuit is defeated in off-chip
Enter power vd DIN relatively low time, such as when VDDIN is 1.5V, VDDIN still can be selected to input as power supply, this can patrol load
Collect and impact, even result in reversion and the clearing of load logic value.It addition, this circuit is slow at off-chip input power VDDIN
During decline, owing to recalcitrating effect of noise, can cause the shake of power supply switch circuit, load circuit can be caused badly by this
Impact.
Existing technology all can not solve the threshold value fixation problem of power supply switching.
Summary of the invention
For solving the problem that above-mentioned prior art exists, the present invention proposes a kind of power supply switching electricity using comparator
Road, the technical scheme that the present invention provides is as follows: a kind of power supply switch circuit using comparator, including comparator, first anti-phase
Device, the second phase inverter, the first buffer, the second buffer, the first PMOS switch pipe, the second PMOS switch pipe, the 3rd PMOS leave
Guan Guan, the 4th PMOS switch pipe；The outer input power of the positive end piece of comparator, negative terminal connects backup battery, and outfan is connected to the
One phase inverter, the second phase inverter, the first buffer and the input of the second buffer；The power supply of the first described phase inverter is even
The outer input power of contact pin, the power supply of the second described phase inverter connects the output of power supply switch circuit, the first described buffer
Power supply connect the output of power supply switch circuit, the power supply of the second described buffer connects backup battery；First PMOS switch
The source of pipe and substrate connect off-chip input power, and drain terminal connects the source of the second PMOS switch pipe, and it is anti-phase that grid end connects first
The output of device；The source of the second PMOS switch pipe connects the drain terminal of the first PMOS switch pipe, drain terminal and substrate and connects power supply switching
The output of circuit, grid end connects the output of the second phase inverter；The source of the 3rd PMOS switch pipe and substrate connect power supply switching electricity
The output on road, drain terminal connects the source of the 4th PMOS switch pipe, and grid end connects the output of the first buffer；4th PMOS switch pipe
Source connect the drain terminal of the 3rd PMOS switch pipe, drain terminal and substrate connect backup battery, and grid end connects the second buffer output
End；Described comparator includes the resistant series sample circuit of off-chip input power, bias current generating circuit, comparator master
Body, the resistant series sample circuit of backup battery.
Need to meet it when the first phase inverter, the second phase inverter, the first buffer, the second buffer design and can drive rear class
The first PMOS switch pipe, the second PMOS switch pipe, the 3rd PMOS switch pipe and the 4th PMOS switch pipe, wherein first is anti-phase
Device, the second phase inverter, the first buffer, the second buffer are when designing internal components size, in addition it is also necessary to ensure electric leakage parameter symbol
Close the design objective of overall chip.
Technical scheme solves power supply switching threshold in MCU and the SOC class circuit using battery standby and fixes
Problem, in particular in the case of operating on low voltage.
Its further technical scheme is:
Comparator sampling input power and backup battery voltage judge whether power supply switches.
Its further technical scheme is:
Comparator also includes positive-feedback circuit, and positive-feedback circuit has lag function.
Its further technical scheme is:
The resistant series sample circuit of off-chip input power includes the first divider resistance, the second divider resistance and the 3rd NMOS
Switching tube, first divider resistance one end is connected with off-chip input power, and other end is connected with the second divider resistance；Second
The other end of divider resistance is connected with the drain electrode of the 3rd NMOS tube；The outer input power of the gate bonding pads of the 3rd NMOS tube,
Source electrode connects ground wire；The resistant series sampling circuit samples ratio of off-chip input power depends on the first dividing potential drop electricity in comparator
Resistance and the second divider resistance.
Its further technical scheme is:
Bias current generating circuit is for providing DC point to comparator main body, and bias current generating circuit includes the
Three divider resistances and biased electrical flow tube, one end of the 3rd divider resistance connects off-chip input power, the 3rd divider resistance other end
Drain electrode and grid with biased electrical flow tube are all connected, the source ground line of biased electrical flow tube.
Its further technical scheme is:
Comparator main body includes the first PMOS, the second PMOS, the first NMOS tube, the second NMOS tube, electric current telescope；The
The grid of the grid of one PMOS and the second PMOS connects, the source electrode of the first PMOS and the source electrode phase of the second PMOS and all
It is connected to off-chip input power VDDIN, drain electrode and the first PMOS, the grid of the second PMOS and the drain electrode of the first NMOS tube
All being connected, the drain electrode of the second PMOS is connected with the drain electrode of the second NMOS tube, the first NMOS tube and the source of the second NMOS tube
The drain electrode of pole and electric current telescope is all connected, and the grid of the second NMOS tube and backup battery sample circuit connect；Electric current telescope
Grid and bias current generating circuit connect, the source ground line of electric current telescope.
Its further technical scheme is:
The resistant series sample circuit of backup battery includes the 4th divider resistance, the 5th divider resistance and the 4th NMOS tube,
4th divider resistance one end is connected with backup battery, and one end of the other end and the 5th divider resistance is connected；5th dividing potential drop electricity
The other end of resistance connects the drain electrode of the 4th NMOS tube；The outer input power of the gate bonding pads of the 4th NMOS tube, source electrode connects ground wire；
The resistant series sampling circuit samples ratio of backup battery depends on the first divider resistance in comparator and the second divider resistance；
The resistant series sample circuit of backup battery is controlled by off-chip input power by the 4th NMOS tube, effective at off-chip input power
In the case of open the sampling channel to backup battery, in the case of invalid, close the sampling channel to backup battery.
Positive-feedback circuit is Schmidt trigger, Schmidt trigger include the 3rd PMOS, the 4th PMOS, the 5th
PMOS, the 6th PMOS, the 5th NMOS tube, the 6th NMOS tube, the 7th NMOS tube and the 8th NMOS tube；3rd PMOS and
The outer input power of the source bond pads of six PMOS, the drain electrode of the 3rd PMOS and the source electrode of the 4th PMOS connect, and even
Receiving off-chip input power VDDIN, drain electrode is all connected with the source electrode of the 4th PMOS and the source electrode of the 5th PMOS；4th
The drain electrode of PMOS and the drain electrode of the 6th NMOS tube and the 5th PMOS, the 6th PMOS, the 7th NMOS tube the 8th NMOS tube
Grid be all connected；The source electrode of the 6th NMOS tube and the source electrode of the drain electrode of the 5th NMOS tube and the 7th NMOS tube are the most connected
Connect；The source ground of the 5th NMOS tube, the grounded drain of the 5th PMOS, the outer input power of the drain electrode contact pin of the 7th NMOS tube
VDDIN, the 3rd PMOS, the 4th PMOS, the 6th NMOS tube are all connected with the grid of the 5th NMOS tube, and are connected to ratio
The relatively outfan of device main body, the outfan of comparator main body is the connection of the drain electrode of the second NMOS tube drain electrode and the second PMOS
Point；6th PMOS is connected with the drain electrode of the 8th NMOS tube, and junction point is the outfan of comparator top layer.
Its further technical scheme is:
Positive-feedback circuit includes the 6th divider resistance, switch, the first rate of exchange device and the second rate of exchange device, the 6th divider resistance one
End and reserve battery sample circuit connect, and the other end and switch connect；The other end of switch and the outfan of comparator top layer are even
Connect；The input of the first rate of exchange device connects the outfan of comparator main body, and the outfan of the first rate of exchange device connects the second rate of exchange device
Input, the outfan that outfan is comparator top layer of the second rate of exchange device；First rate of exchange device and the second rate of exchange device act primarily as
Effect to waveform shaping.
The invention also discloses a kind of signal transfer method, have employed power supply switch circuit as above, its signal passes
Pass method as follows；
(1) exist when off-chip input power and backup battery, the electricity of the sample circuit input of off-chip input power simultaneously
When pressure is higher than the sample circuit input voltage of backup battery, the voltage of comparator main body outfan raises, through positive-feedback circuit
The value of output VDDIN_VALID is 1, and the threshold value that now off-chip input supply voltage sets already above comparator, comparator is defeated
Go out 1, open the first PMOS switch pipe and the second PMOS switch pipe by the first phase inverter and the second phase inverter, simultaneously by first
Buffer and the second buffer close the 3rd PMOS switch pipe and the 4th PMOS switch pipe, thus realize selecting off-chip input power
Function as follow-up load power source；
(2) exist when off-chip input power and backup battery, the electricity of the sample circuit input of off-chip input power simultaneously
Forcing down when the sample circuit input voltage of backup battery, the voltage of comparator main body outfan reduces, through positive-feedback circuit
The value of output VDDIN_VALID is 0, and during the threshold value that now off-chip input supply voltage sets less than comparator, comparator exports
0, close the first PMOS switch pipe and the second PMOS switch pipe by the first phase inverter and the second phase inverter, delay by first simultaneously
Rush device and the second buffer opens the 3rd PMOS switch pipe and the 4th PMOS switch pipe, thus realize selecting backup battery as rear
The function of continuous load power source；
(3) when only exist off-chip input power and backup battery non-existent in the case of, due to comparator negative terminal sampled value
Being now 0, therefore comparator output 1, opens the first PMOS switch pipe and second by the first phase inverter and the second phase inverter
PMOS switch pipe, closes the 3rd PMOS switch pipe by the first buffer simultaneously, thus reaches to select the merit of off-chip input power
Energy；
(4) in the presence of only backup battery, the power supply used due to comparator is off-chip input power, and this
Time do not exist, therefore comparator output 0, is separately turned on the 3rd PMOS switch pipe and the by the first buffer and the second buffer
Four PMOS switch pipes, close the second PMOS switch pipe by the second phase inverter simultaneously, thus reach to select the merit of backup battery
Energy.
The top layer of whole comparator uses off-chip input power VDDIN as power supply, the output " VDDIN_ of comparator
VALID " logical value whether indicate off-chip input power VDDIN effective, when exporting " VDDIN_VALID " and being 1, sheet is described
Outer input power is effective, and power supply switch circuit can select off-chip input power as follow-up negative according to the output logical value of comparator
The power supply input carried；Otherwise off-chip input power is invalid, and power supply switch circuit can select backup according to the output logic of comparator
Power supply BATT inputs as the power supply of follow-up load.
The positive-feedback circuit of comparator has lag function simultaneously, quickly responds, it is to avoid off-chip input supply voltage exists
The shake of the power supply switch circuit that the Near Threshold that comparator sets causes or the probability of concussion, it is ensured that power supply switching electricity
Stablizing and reliable of road.
According to the requirement of different chip systems, can arbitrarily regulate the first divider resistance and the second divider resistance, Yi Ji
Four divider resistances and the 5th divider resistance, thus obtain the threshold value that comparator sets.
Further, since the unlatching of the 4th divider resistance of backup battery BATT and the 5th divider resistance is by off-chip input electricity
The control of source VDDIN, in the case of VDDIN is non-existent, the sampling resistor of backup battery BATT does not work, thus further
Reduce the electric energy loss of backup battery BATT.
In MCU and SOC class circuit, its power supply switch circuit uses the present invention, has following technical effect that
1. super low-power consumption.Owing to the logic judging circuit in the present invention i.e. comparator uses off-chip input power, because of
This will not the energy of additional waste backup battery.In appropriate design comparator, the 4th divider resistance and the 5th divider resistance is exhausted
In the case of value, we can be by the lower power consumption of backup battery to na (nA) rank.It addition, the 4th divider resistance and
The sampling path of five divider resistances is also controlled by off-chip input power VDDIN, non-existent at off-chip input power VDDIN
In the case of, this sampling channel can't be opened, and therefore can't cause the loss of backup battery energy.
2. switching threshold is accurate.Owing to the switch logic of the present invention is to need by judging off-chip input power and backup electricity
The height in source obtains.The first divider resistance and the ratio of the second divider resistance and the 4th dividing potential drop in appropriate design comparator
After the ratio of resistance and the 5th divider resistance, the threshold voltage of power supply switching is fixing.Therefore the present invention can accomplish electricity
The accuracy of the threshold value of source switching.
3. the reliability of power supply switching.The present invention is on the basis of appropriate design switching threshold, at the outfan of comparator
Add Schmidt trigger, by the device size of appropriate design Schmidt trigger, it is possible to the design that meets obtaining needing refers to
Target hysteresis voltage.Thus avoid supply voltage near threshold point time cause comparator output shake cause whole
The shake of power supply switch circuit and instability.
4. applicable craft scope is wide.Owing to the present invention uses the MOS technological design of current main flow, therefore the present invention fits
For all MOS technique.
5. for the not requirement of power supply electrifying, power-off sequential.The present invention uses threshold voltage determination methods, in off-chip
Input power VDDIN and backup battery BATT can make corresponding switching judging when reaching threshold point.Therefore for off-chip
Input power and backup battery BATT power on and the not requirement of power down time length.This is very big adds the present invention's
Suitable environment, because different products has different power supply electrifying, power down duration, identical chip is in different application scenarios
In also there will be different power on, power down duration, and the present invention can ignore these power on, the temporal difference of power down aspect.
Accompanying drawing explanation
Fig. 1 is the connection figure of parallel diode power supply switch circuit in prior art；
Fig. 2 is the connection figure of prior art breaker in middle Switching power selection circuit；
Fig. 3 is the power supply switch circuit connection figure using comparator；
Fig. 4 is the comparator circuit connection figure using Schmidt trigger to make positive-feedback circuit；
Fig. 5 is the comparator circuit connection figure using the positive-feedback circuit including resistance and switch.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described further.
Embodiment one
As shown in Figure 3, power supply switch circuit connection description:
A kind of power supply switch circuit using comparator, including comparator CMP, the first phase inverter INV1, the second phase inverter
INV2, the first buffer BUFF1, the second buffer BUFF2, the first PMOS switch pipe PFET1, the second PMOS switch pipe PFET2,
3rd PMOS switch pipe PFET3, the 4th PMOS switch pipe PFET4；The outer input power VDDIN of the positive end piece of comparator CMP, negative
Termination backup battery BATT, outfan be connected to the first phase inverter INV1, the second phase inverter INV2, the first buffer BUFF1 with
And second input of buffer BUFF2；The outer input power VDDIN of the power source connecting of the first phase inverter INV1, second is anti-phase
The power supply of device INV2 connects the power supply of the output VDDOUT, the first buffer BUFF1 of power supply switch circuit and connects power supply switching electricity
The power supply of the output VDDOUT on road, the second buffer BUFF2 connects backup battery BATT；The source of the first PMOS switch pipe PFET1
End and substrate connect off-chip input power VDDIN, and drain terminal connects the source of the second PMOS switch pipe PFET2, and grid end connects first
The output of phase inverter INV1；The source of the second PMOS switch pipe PFET2 connects the drain terminal of the first PMOS switch pipe PFET1, drain terminal
With the output VDDOUT that substrate connects power supply switch circuit, grid end connects the output of the second phase inverter INV2；3rd PMOS switch
The source of pipe PFET3 and substrate connect the output VDDOUT of power supply switch circuit, and drain terminal connects the 4th PMOS switch pipe PFET4's
Source, grid end connects the output of the first buffer BUFF1；The source of the 4th PMOS switch pipe PFET4 connects the 3rd PMOS switch
The drain terminal of pipe PFET3, drain terminal and substrate connect backup battery BATT, and grid end connects the outfan of the second buffer BUFF2.
As shown in Figure 4, comparator circuit connection description:
Comparator sampling input power and backup battery voltage judge whether power supply switches, and comparator includes that off-chip inputs
The resistant series sample circuit of power vd DIN, bias current generating circuit, comparator main body, the resistance string of backup battery BATT
Connection sample circuit and Schmidt trigger.
The resistant series sample circuit of off-chip input power VDDIN includes the first divider resistance R1, the second divider resistance R2
With the 3rd nmos switch pipe N3, first divider resistance R1 one end is connected with off-chip input power VDDIN, other end and second point
Piezoresistance R2 is connected；The other end of the second divider resistance R2 is connected with the drain electrode of the 3rd nmos switch pipe N3；3rd NMOS opens
Closing the outer input power VDDIN of gate bonding pads of pipe N3, source electrode connects ground wire GND.
Bias current generating circuit is for providing DC point to comparator main body, and bias current generating circuit includes the
Three divider resistance R3 and biased electrical flow tube N11 composition, the outer input power VDDIN of an end piece of the 3rd divider resistance R3, the 3rd
The drain and gate of divider resistance R3 another termination bias current pipe N11, the source ground of biased electrical flow tube N11.
Comparator main body includes that the grid of the first PMOS P1 and the grid of the second PMOS P2 connect, the first PMOS P1
Source electrode and the second PMOS P2 source electrode be connected to off-chip input power VDDIN, the drain electrode of the first PMOS P1 and a PMOS
Pipe P1, the grid of the second PMOS P2 are connected, and are simultaneously connected to the drain electrode of the first NMOS tube N1, the drain electrode of the second PMOS P2 and
The drain electrode of the second NMOS tube N2 is connected, and the source electrode of the first NMOS tube N1 and the second NMOS tube N2 is connected to the leakage of electric current telescope N0
Pole, the grid of electric current telescope N0 and the grid of biased electrical flow tube N11 connect, the source ground of electric current telescope N0, the second NMOS tube
The grid of N2 and the 3rd divider resistance R3 and the 4th divider resistance R3 junction point are connected.
Backup battery resistant series sample circuit includes the 4th divider resistance R4, the 5th divider resistance R5 and the 4th NMOS tube
N4, the 5th divider resistance R4 one end is connected with backup battery BATT, and one end of the other end and the 5th divider resistance R5 is connected；
The other end of the 5th divider resistance R5 connects the drain electrode of the 4th NMOS tube N4；Input outside the gate bonding pads of the 4th NMOS tube N4
Power vd DIN, source electrode connects ground wire GND；Backup battery sample circuit passes through the 4th NMOS tube N4 by off-chip input power VDDIN
Control, in the case of off-chip input power VDDIN is effective, opens the sampling channel to backup battery, in the feelings that VDDIN is invalid
The sampling channel to backup battery is closed under condition.
Schmidt trigger include the 3rd PMOS P3, the 4th PMOS P4, the 5th PMOS P5, the 6th PMOS P6,
5th NMOS tube N5, the 6th NMOS tube N6, the 7th NMOS tube N7 and the 8th NMOS tube N8；3rd PMOS P3 and the 6th PMOS
The source electrode of P6 is connected, and is connected to off-chip input power, drain electrode and the source electrode of the 4th PMOS P4 and the 5th PMOS P5
Source electrode be all connected；The drain electrode of the 4th PMOS P4 and the drain electrode of the 6th NMOS tube N6 and the 5th PMOS P5, the 6th
PMOS P6, the 7th NMOS tube N7, the grid of the 8th NMOS tube N8 are all connected；The source electrode of the 6th NMOS tube N6 and the 5th NMOS
The drain electrode of pipe N5 and the source electrode of the 7th NMOS tube N7 are all connected；The source electrode connection ground wire GND of the 5th NMOS tube N5, the 5th
The drain electrode of PMOS P5 connects ground wire GND, and the drain electrode of the 7th NMOS tube N7 connects off-chip input power VDDIN, the 3rd PMOS
The grid of P3, the 4th PMOS P4, the 6th NMOS tube N6 and the 5th NMOS tube N5 is all connected, and is connected to comparator master
The outfan of body, the outfan of comparator main body is the junction point of the drain electrode of the second NMOS tube N2 drain electrode and the second PMOS P2；
The drain electrode of the 6th PMOS P6 and the 8th NMOS tube N8 is connected, and junction point is the outfan VDDIN_VALID of comparator top layer.
Exist if the power source combination of power supply switch circuit is off-chip input power VDDIN and backup battery BATT simultaneously,
The voltage of the resistant series sample circuit input of the off-chip input power VDDIN resistant series sampling electricity higher than backup battery BATT
Road input voltage, its circuit signal transmission method is as follows:
The voltage of comparator main body outfan raises, and the value through positive-feedback circuit output VDDIN_VALID is 1, now
The threshold value that off-chip input supply voltage sets already above comparator, comparator output 1, by the first phase inverter INV1 and second
Phase inverter INV2 opens the first PMOS switch pipe PFET1 and the second PMOS switch pipe PFET2, simultaneously by the first buffer
BUFF1 and the second buffer BUFF2 closes the 3rd PMOS switch pipe PFET3 and the 4th PMOS switch pipe PFET4, thus realizes choosing
Select the off-chip input power VDDIN function as follow-up load power source.
The top layer of whole comparator uses off-chip input power VDDIN as power supply, the output " VDDIN_ of comparator
VALID " logical value whether indicate off-chip input power VDDIN effective, when exporting " VDDIN_VALID " and being 1, sheet is described
Outer input power is effective, when exporting " VDDIN_VALID " and being 0, illustrates that off-chip input power is invalid, and power supply switch circuit can root
Select backup battery BATT or off-chip input power VDDIN defeated as the power supply of follow-up load according to the output logical value of comparator
Enter.
According to the requirement of different chip systems, can arbitrarily regulate the first divider resistance R1 and the ratio of the second divider resistance R2
Example, and the 4th divider resistance R4 and the ratio of the 5th divider resistance R5, thus obtain the power supply switching threshold point needed.Such as
We needTime Switching power selection circuit to off-chip input power VDDIN, then can setTo simultaneouslyBring intoJust
Can obtainWithRatio there is relation one to one.If we fixThen
After the ratio of divider resistance R1/R2 and R4/R5 determines, if comparator anode input voltage that is first
The grid voltage of NMOS tube N1 is higher than the grid voltage of negative terminal input voltage that is second NMOS tube N2, and now the first NMOS tube N1 is leaked
Electric current Ids1 is more than the second NMOS tube N2 leakage current Ids2, and the first PMOS P1 and the second PMOS P2 are owing to being electric current mirror holder
Structure, therefore leakage current is identical, is all same as the leakage current Ids1 of the first NMOS tube N1, therefore comparator main body outfan that is second
The drain voltage of NMOS tube N2 raises, and the value through positive-feedback circuit output VDDIN_VALID is 1, shows now off-chip input
The threshold value that supply voltage sets already above comparator, power selection circuit is switched to off-chip input power VDDIN；Otherwise power supply
Switching circuit is switched to backup battery BATT.
Further, since the unlatching of the 4th divider resistance R4 and the 5th divider resistance R5 of backup battery BATT is by the 4th
NMOS tube N4 is controlled by off-chip input power VDDIN, in the case of VDDIN is non-existent, and the sampling of backup battery BATT
Resistance does not work, thus reduces the electric energy loss of backup battery BATT further.
The output of comparator uses Schmidt's logic, thus avoid off-chip input power near threshold point time power supply cut
Change the probability of circuit jitter or concussion, it is ensured that stablizing and reliable of power supply switch circuit.
Embodiment two
The circuit connection diagram of power supply switch circuit as shown in Figure 3, is illustrated in embodiment 1.
As it is shown in figure 5, comparator circuit connection description:
Comparator sampling input power and backup battery voltage judge that sheet external power is the most effective, described comparator bag
Include the resistant series sample circuit of off-chip input power VDDIN, bias current generating circuit, comparator main body, backup battery
The resistant series sample circuit of BATT and Schmidt trigger.
The resistant series sample circuit of off-chip input power VDDIN includes the first divider resistance R1 ', the second divider resistance
R2 ' and the 3rd nmos switch pipe N3 ', first divider resistance R1 ' one end is connected with off-chip input power VDDIN, other end and
Second divider resistance R2 ' is connected；The other end of the second divider resistance R2 ' is connected with the drain electrode of the 3rd nmos switch pipe N3 '；The
The outer input power VDDIN of the gate bonding pads of three nmos switch pipe N3 ', source electrode connects ground wire GND.
Bias current generating circuit is for providing DC point to comparator main body, and bias current generating circuit includes the
One end connection off-chip input power VDDIN of three divider resistance R3 ' and biased electrical flow tube N11 ', the 3rd divider resistance R3 ', the 3rd
Divider resistance R3 ' the other end is all connected with drain electrode and the grid of biased electrical flow tube N11 ', the source electrode of biased electrical flow tube N11 '
Earth lead GND.
Comparator main body includes the first PMOS P1 ', the second PMOS P2 ', the first NMOS tube N1 ', the second NMOS tube
N2 ', electric current telescope N0 '；The grid of the first PMOS P1 ' and the grid of the second PMOS P2 ' connect, the first PMOS P1's '
Source electrode and the source electrode phase of the second PMOS P2 ' and be all connected to off-chip input power VDDIN, drain electrode and the first PMOS P1 ', the
The grid of two PMOS P2 ' and the drain electrode of the first NMOS tube N1 ' are all connected, the drain electrode and second of the second PMOS P2 '
The drain electrode of NMOS tube N2 ' is connected, the source electrode of the first NMOS tube N1 ' and the second NMOS tube N2 ' and the drain electrode of electric current telescope N0 '
All being connected, the grid of the second NMOS tube N2 ' and backup battery resistant series sample circuit connect；The grid of electric current telescope N0 '
Connect with bias current generating circuit, the source ground line GND of electric current telescope N0 '.
The resistant series sample circuit of backup battery includes the 4th divider resistance R4 ', the 5th divider resistance R5 ' and the 4th
NMOS tube N4 ', the 5th divider resistance R4 ' one end is connected with backup battery BATT, the other end and the one of the 5th divider resistance R5 '
End is connected；The other end of the 5th divider resistance R5 ' connects the drain electrode of the 4th NMOS tube N4 '；The grid of the 4th NMOS tube N4 '
Connecting off-chip input power VDDIN, source electrode connects ground wire GND；Backup battery sample circuit passes through the 4th NMOS tube N4 ' by off-chip
Input power VDDIN controls, and opens the sampling channel to backup battery in the case of off-chip input power VDDIN is effective,
The sampling channel to backup battery is closed in the case of VDDIN is invalid.
Positive-feedback circuit includes the 6th divider resistance R6, switch K1, the first rate of exchange device INVC1 and the second rate of exchange device INVC2,
6th divider resistance R6 one end and reserve battery sample circuit connect, and the other end and switch K1 connect；Switch K1 the other end and
The outfan VDDIN_VALID of comparator top layer connects；Resistance R6 and switch K1 plus the output VDDIN_VALID of comparator is
May make up a feedback, when VDDIN_VALID effectively (=1), switch K1 opens, by the negative terminal input i.e. metal-oxide-semiconductor of comparator
The grid of N2 drags down further, and this also corresponds to add a hysteresis voltage to comparator.The input of the first rate of exchange device INVC1
Connecting the outfan (drain terminal of the second NMOS tube N2) of comparator main body, the outfan of the first rate of exchange device INVC1 connects the second ratio
The input of valency device INVC2, the outfan VDDIN_VALID that outfan is comparator top layer of the second rate of exchange device INVC2；First
Rate of exchange device INVC1 and the second rate of exchange device INVC2 primarily serves the effect of waveform shaping.
Exist if the power source combination of power supply switch circuit is off-chip input power VDDIN and backup battery BATT simultaneously,
And the sample circuit input voltage that the voltage of the sample circuit input of off-chip input power VDDIN is less than backup battery BATT, its
The signal transfer method of power supply switch circuit is as follows:
The voltage of comparator main body outfan reduces, and the value through positive-feedback circuit output VDDIN_VALID is 0, now
During the threshold value that off-chip input supply voltage sets less than comparator, comparator output 0, anti-by the first phase inverter INV1 and second
Phase device INV2 closes the first PMOS switch pipe PFET1 and the second PMOS switch pipe PFET2, simultaneously by the first buffer BUFF1
Open the 3rd PMOS switch pipe PFET3 and the 4th PMOS switch pipe PFET4 with the second buffer BUFF2, thus realize selecting standby
Part power supply BATT is as the function of follow-up load power source.
The top layer of whole comparator uses off-chip input power VDDIN as power supply, the output " VDDIN_ of comparator
VALID " logical value whether indicate off-chip input power VDDIN effective, when exporting " VDDIN_VALID " and being 1, sheet is described
Outer input power is effective, when exporting " VDDIN_VALID " and being 0, illustrates that off-chip input power is invalid, and power supply switch circuit can root
Select backup battery BATT or off-chip input power VDDIN defeated as the power supply of follow-up load according to the output logical value of comparator
Enter.
According to the requirement of different chip systems, can arbitrarily regulate the first divider resistance R1's ' and the second divider resistance R2 '
Ratio, and the ratio of the 4th divider resistance R4 ' and the 5th divider resistance R5 ', thus obtain the power supply switching threshold point needed.
Such as we needTime Switching power selection circuit to off-chip input power VDDIN, then can setTo simultaneouslyBring into
Can be obtained byWithRatio there is relation one to one.If we fixThen
At divider resistanceAndRatio determine after, if comparator anode input voltage that is the oneth NMOS
The grid voltage of the pipe N1 ' grid voltage higher than negative terminal input voltage that is second NMOS tube N2 ', now the first NMOS tube N1 ' leakage
Electric current Ids1 is more than the second NMOS tube N2 ' leakage current Ids2, and the first PMOS P1 ' and the second PMOS P2 ' is owing to being electric current
Mirror holder structure, therefore leakage current is identical, is all same as the leakage current Ids1 of the first NMOS tube N1 ', and therefore comparator main body outfan is i.e.
The drain voltage of the second NMOS tube N2 ' raises, and the value through positive-feedback circuit output VDDIN_VALID is 1, shows now off-chip
The threshold value that input supply voltage sets already above comparator, power selection circuit is switched to off-chip input power VDDIN；Otherwise
Power supply switch circuit is switched to backup battery BATT.
Further, since the unlatching of the 4th divider resistance R4 ' and the 5th divider resistance R5 ' of backup battery BATT is by the 4th
NMOS tube N4 ' is controlled by off-chip input power VDDIN, in the case of VDDIN is non-existent, and the sampling of backup battery BATT
Resistance does not work, thus reduces the electric energy loss of backup battery BATT further.
If the power source combination of power supply switch circuit is to only exist off-chip input power VDDN and backup battery BATT does not exists
In the case of, the power supply used due to comparator is off-chip input power VDDIN, and the communication means of power supply switch circuit is as follows:
Owing to comparator negative terminal sampled value is now 0, therefore comparator output 1, by the first phase inverter INV1 and second
Phase inverter INV2 opens the first PMOS switch pipe PFET1 and the second PMOS switch pipe PFET2, simultaneously by the first buffer
BUFF1 closes the 3rd PMOS switch pipe PFET3, thus reaches to select the function of off-chip input power VDDIN；
If in the presence of the power source combination of power supply switch circuit is only backup battery BATT, owing to comparator uses
Power supply be off-chip input power VDDIN, the signal transfer method of power supply switch circuit is as follows:
Now VDDIN does not exists, therefore comparator output 0, by the first buffer BUFF1 and the second buffer BUFF2
It is separately turned on the 3rd PMOS switch pipe PFET3 and the 4th PMOS switch pipe PFET4, is closed by the second phase inverter INV2 simultaneously
Second PMOS switch pipe PFET2, thus reach to select the function of backup battery BATT.
The foregoing is only embodiments of the invention, be not limited to the present invention, for those skilled in the art
For Yuan, the electrical combination within comparator is all within the spirit and principles in the present invention, and any amendment, the equivalent made are replaced
Change, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a power supply switch circuit, it is characterised in that: include comparator, the first phase inverter, the second phase inverter, the first buffering
Device, the second buffer, the first PMOS switch pipe, the second PMOS switch pipe, the 3rd PMOS switch pipe, the 4th PMOS switch pipe；Institute
The anode of the comparator stated connects off-chip input power, and negative terminal connects backup battery, outfan be connected to the first phase inverter, second
Phase inverter, the first buffer and the input of the second buffer；Electricity is inputted outside the power source connecting of the first described phase inverter
Source, the power supply of the second described phase inverter connects the output of power supply switch circuit, and the power supply of the first described buffer connects electricity
The output of source switching circuit, the power supply of the second described buffer connects backup battery；The source of the first described PMOS switch pipe
End and substrate connect off-chip input power, and drain terminal connects the source of the second PMOS switch pipe, and grid end connects the defeated of the first phase inverter
Go out；The source of the second described PMOS switch pipe connects the drain terminal of the first PMOS switch pipe, drain terminal and substrate and connects power supply switching
The output of circuit, grid terminate the outfan of the second phase inverter；Source and the substrate of the 3rd described PMOS switch pipe connect power supply and cut
Changing the output of circuit, drain terminal connects the source of the 4th PMOS switch pipe, and grid end connects the outfan of the first buffer；Described
The source of four PMOS switch pipes connects the drain terminal of the 3rd PMOS switch pipe, drain terminal and substrate and connects backup battery, and grid end connects second
The outfan of buffer；Described comparator includes that the resistant series sample circuit of off-chip input power, bias current produce electricity
Road, comparator main body, the resistant series sample circuit of backup battery.
2. a kind of power supply switch circuit as claimed in claim 1, it is characterised in that: input electricity outside described comparator sampling sheet
Source and backup battery voltage judge whether switching.
3. a kind of power supply switch circuit as claimed in claim 1, it is characterised in that: described comparator also includes positive and negative feed
Road, described positive-feedback circuit has lag function.
4. a kind of power supply switch circuit as claimed in claim 1, it is characterised in that: the resistance string of described off-chip input power
Connection sample circuit includes the first divider resistance, the second divider resistance and the 3rd nmos switch pipe；The first described divider resistance one
End is connected with off-chip input power, and other end is connected with the second divider resistance；The second described divider resistance is additionally
One end is connected with the drain electrode of the 3rd NMOS tube；The outer input power of the gate bonding pads of the 3rd described NMOS tube, source electrode connects
Ground wire；The resistance series circuit oversampling ratio of described off-chip input power depends on the first divider resistance in comparator and
Two divider resistances.
5. a kind of power supply switch circuit as claimed in claim 1, it is characterised in that: the resistant series of described backup battery is adopted
Sample circuit includes the 4th divider resistance, the 5th divider resistance and the 4th NMOS tube, the 4th divider resistance one end and backup battery phase
Connecting, one end of the other end and the 5th divider resistance is connected；The other end of the 5th divider resistance connects the leakage of the 4th NMOS tube
Pole；The outer input power of the gate bonding pads of the 4th NMOS tube, source electrode connects ground wire；The resistant series sampling of described backup battery
Circuit sampling ratio depends on the 4th divider resistance in comparator and the 5th divider resistance；The resistance string of described backup battery
Connection sample circuit is controlled by off-chip input power by the 4th NMOS tube, opens standby in the case of off-chip input power is effective
The sampling channel of part power supply, closes the sampling channel to backup battery in the case of invalid.
6. a kind of power supply switch circuit as claimed in claim 2, it is characterised in that: described bias current generating circuit is used for
Thering is provided DC point to described comparator main body, described bias current generating circuit includes the 3rd divider resistance and biasing
Tube of current forms；One end of the 3rd described divider resistance connects off-chip input power；The 3rd described divider resistance other end
Drain electrode and grid with biased electrical flow tube are all connected；The source ground line of described biased electrical flow tube.
7. a kind of power supply switch circuit as claimed in claim 2, it is characterised in that: described comparator main body includes first
PMOS, the second PMOS, the first NMOS tube, the second NMOS tube, electric current telescope；The grid and second of the first described PMOS
The grid of PMOS connects, and the source electrode of source electrode and the second PMOS is connected and is all connected to off-chip input power, drain electrode and the
The drain electrode of one PMOS, the grid of the second PMOS and the first NMOS tube is all connected；The drain electrode of the second described PMOS
Drain electrode with the second NMOS tube is connected, the first described NMOS tube and the source electrode of the second NMOS tube and the drain electrode of electric current telescope
All it is connected；The grid of the second described NMOS tube and backup battery sample circuit connect；The grid of described electric current telescope and
Bias current generating circuit connects, source ground line.
8. any one power supply switch circuit as described in claim 3 to 7, it is characterised in that: described positive-feedback circuit is
Schmidt trigger, described Schmidt trigger includes the 3rd PMOS, the 4th PMOS, the 5th PMOS, the 6th PMOS
Pipe, the 5th NMOS tube, the 6th NMOS tube, the 7th NMOS tube and the 8th NMOS tube；Described the 3rd PMOS source electrode and the 6th
The source electrode of PMOS is connected, and is connected to off-chip input power, drain electrode and the source electrode of the 4th PMOS and the 5th PMOS
The source electrode of pipe is all connected；The drain electrode of the 4th described PMOS and the drain electrode of the 6th NMOS tube and the 5th PMOS, the 6th
PMOS, the 7th NMOS tube, the grid of the 8th NMOS tube are all connected；The source electrode of the 6th described NMOS tube and the 5th NMOS tube
Drain electrode and the source electrode of the 7th NMOS tube be all connected；The source electrode of the 5th described NMOS tube connects ground wire, described the 5th
The drain electrode of PMOS connects ground wire, and the drain electrode of the 7th described NMOS tube connects off-chip input power；Described the 3rd PMOS,
The grid of the 4th PMOS, the 6th NMOS tube and the 5th NMOS tube is all connected, and is connected to the output of comparator main body
End, the outfan of comparator main body is the junction point of the drain electrode of the second NMOS tube drain electrode and the second PMOS；Described the 6th
PMOS is connected with the drain electrode of the 8th NMOS tube, and junction point is the outfan of comparator top layer.
9. the arbitrary a kind of power supply switch circuit as described in claim 3 to 7, it is characterised in that: described positive-feedback circuit
Including the 6th divider resistance, switch, the first rate of exchange device and the second rate of exchange device, the 6th described divider resistance one end and reserve battery
Resistant series sample circuit connect, the other end and switch connect；The other end of described switch and the output of comparator top layer
End connects；The input of the first rate of exchange device connects the outfan of comparator main body, and the outfan of the first rate of exchange device connects the second ratio
The input of valency device, the outfan that outfan is comparator top layer of the second rate of exchange device；First rate of exchange device and the second rate of exchange device rise
Effect to waveform shaping.
10. a signal transfer method, is applied to the power supply switch circuit as described in claim 1-7, it is characterised in that: described
Signal transfer method as follows；
(1) exist when off-chip input power and backup battery simultaneously, off-chip input power resistant series sample circuit defeated
The voltage entered higher than backup battery resistant series sample circuit input voltage time, the voltage liter of comparator main body outfan
Height, the value through positive-feedback circuit output VDDIN_VALID is 1, and now off-chip input supply voltage sets already above comparator
Fixed threshold value, comparator output 1, open the first PMOS switch pipe by the first phase inverter and the second phase inverter and the 2nd PMOS opens
Guan Guan, closes the 3rd PMOS switch pipe and the 4th PMOS switch pipe by the first buffer and the second buffer simultaneously, thus real
Now select off-chip input power as the function of follow-up load power source；
(2) exist when off-chip input power and backup battery, the resistant series sample circuit input of off-chip input power simultaneously
Voltage less than the resistant series sample circuit input voltage of backup battery time, the voltage of comparator main body outfan reduces, warp
The value crossing positive-feedback circuit output VDDIN_VALID is 0, the threshold value that now off-chip input supply voltage sets less than comparator
Time, comparator output 0, close the first PMOS switch pipe and the second PMOS switch pipe by the first phase inverter and the second phase inverter,
Open the 3rd PMOS switch pipe and the 4th PMOS switch pipe by the first buffer and the second buffer simultaneously, thus realize selecting
Backup battery is as the function of follow-up load power source；
(3) when only exist off-chip input power and backup battery non-existent in the case of, due to comparator negative terminal sampled value now
Being 0, therefore comparator output 1, opens the first PMOS switch pipe by the first phase inverter and the second phase inverter and the 2nd PMOS opens
Guan Guan, closes the 3rd PMOS switch pipe by the first buffer simultaneously, thus reaches to select the function of off-chip input power；
(4) in the presence of only backup battery, the power supply used due to comparator is off-chip input power, and the most not
Existing, therefore comparator output 0, is separately turned on the 3rd PMOS switch pipe and the 4th by the first buffer and the second buffer
PMOS switch pipe, closes the second PMOS switch pipe by the second phase inverter simultaneously, thus reaches to select the function of backup battery.
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| CN201610423151.7A CN105958632B (en) | 2016-06-16 | 2016-06-16 | A kind of power supply switch circuit and signal transfer method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105958631A (en) * | 2016-06-16 | 2016-09-21 | 苏州微控智芯半导体科技有限公司 | Power supply switching circuit employing comparator and signal transmission method |
| CN109245756A (en) * | 2018-11-07 | 2019-01-18 | 深圳讯达微电子科技有限公司 | A kind of method and chip output interface circuit reducing power domain switching noise |
| CN114301154A (en) * | 2020-09-22 | 2022-04-08 | 西安诺瓦星云科技股份有限公司 | Power supply backup control panel, display controller and LED display control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105958631A (en) * | 2016-06-16 | 2016-09-21 | 苏州微控智芯半导体科技有限公司 | Power supply switching circuit employing comparator and signal transmission method |
| CN205753623U (en) * | 2016-06-16 | 2016-11-30 | 苏州微控智芯半导体科技有限公司 | A kind of power supply switch circuit |
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2016
- 2016-06-16 CN CN201610423151.7A patent/CN105958632B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105958631A (en) * | 2016-06-16 | 2016-09-21 | 苏州微控智芯半导体科技有限公司 | Power supply switching circuit employing comparator and signal transmission method |
| CN205753623U (en) * | 2016-06-16 | 2016-11-30 | 苏州微控智芯半导体科技有限公司 | A kind of power supply switch circuit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105958631A (en) * | 2016-06-16 | 2016-09-21 | 苏州微控智芯半导体科技有限公司 | Power supply switching circuit employing comparator and signal transmission method |
| CN105958631B (en) * | 2016-06-16 | 2018-08-03 | 苏州微控智芯半导体科技有限公司 | A kind of power supply switch circuit and signal transfer method using comparator |
| CN109245756A (en) * | 2018-11-07 | 2019-01-18 | 深圳讯达微电子科技有限公司 | A kind of method and chip output interface circuit reducing power domain switching noise |
| CN109245756B (en) * | 2018-11-07 | 2023-10-03 | 深圳讯达微电子科技有限公司 | Method for reducing power domain switching noise and chip output interface circuit |
| CN114301154A (en) * | 2020-09-22 | 2022-04-08 | 西安诺瓦星云科技股份有限公司 | Power supply backup control panel, display controller and LED display control system |
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| CN105958632B (en) | 2019-08-16 |
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