CN107681885A - A kind of power-down retaining circuit and method - Google Patents
A kind of power-down retaining circuit and method Download PDFInfo
- Publication number
- CN107681885A CN107681885A CN201710821349.5A CN201710821349A CN107681885A CN 107681885 A CN107681885 A CN 107681885A CN 201710821349 A CN201710821349 A CN 201710821349A CN 107681885 A CN107681885 A CN 107681885A
- Authority
- CN
- China
- Prior art keywords
- unit
- power
- input
- control
- output end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of power-down retaining circuit and method.The present invention detects the output signal of power subsystem by detection of power loss unit, the input signal of load unit controls the work of charging control unit and control of discharge unit with output control signal, when realizing power subsystem power down, charging control unit is disconnected, control of discharge unit is switched on so that charge storage unit is powered to load unit, realize that power down is kept, the safety power supply that ensureing load unit has abundance is used to back up important information during power down, and be avoided that charge storage unit put when filling caused by state labile, proof load unit can normal table work when power down is kept.
Description
Technical field
The present invention relates to power down protection field, especially a kind of power-down retaining circuit and method.
Background technology
One basic function of electronic equipment is exactly switching on and shutting down.For some important equipment, particularly before shutdown
The electronic equipment of preservation significant data is needed, simple cut-out working power inevitably results in data and has little time to preserve and lose,
Cause immeasurable loss.For the higher medical treatment electronic equipment of security requirement, accident power-off or electricity are even more prevented
Pond electricity exhausts and unexpected shut down causes the situation of loss of data, so, for the safety of device data, safe and reliable delay
Shutdown turns into an essential link.
At present, most of equipment that on/off circuit is provided, particularly PC computers, handheld mobile device, industrial instrumentation
Instrument, intelligent switchboard etc., all it is after being detected by program control chip to power switch button, exports a delay Sofe Switch machine letter
Number realize on/off.Control complex, response is slower, and once program control chip crashes, then cannot respond to off signal,
And can not power cutoff.In addition, this method can not handle abnormal power-down or the delaying shutdown in the case that battery exhausts, hold
Easily cause loss of data.
Existing on/off circuit, circuit is excessively complicated, and cost is higher, and independence is not strong, can not handle abnormal power-down feelings
Condition.
The content of the invention
In order to solve the above-mentioned technical problem, the present invention provides a kind of power-down retaining circuit and method, for defeated in power down
Go out the electric energy of storage with proof load cell delay power down.
The technical solution adopted in the present invention is：A kind of power-down retaining circuit, including power subsystem, load supplying unit and
Load unit, the output end of the power subsystem are connected with the input of load supplying unit, the load supplying unit it is defeated
Go out end to be connected with the input of load unit；
The power-down retaining circuit also includes detection of power loss unit, charging control unit, charge storage unit and control of discharge list
Member；
The output end of the power subsystem and the input of charging control unit, the input of detection of power loss unit connect；
The input with detection of power loss unit, the input of control of discharge unit are connected the output end of the charge storage unit respectively；It is described
Load unit is connected with detection of power loss unit；The input with charging control unit respectively of the output end of the detection of power loss unit
End, the input of control of discharge unit are connected to control charging control unit, the break-make of control of discharge unit；The charge control
The output end of unit and the input of charge storage unit connect；The output end of the control of discharge unit and the input of load unit
Connection.
Further, the power-down retaining circuit also includes output voltage regulation unit, the output end of the control of discharge unit
Connected by the input for exporting voltage regulation unit and load unit.
Further, the output voltage regulation unit includes the first electric capacity and the second electric capacity, one end of first electric capacity and
One end of second electric capacity, the output end connection of control of discharge unit, one end of second electric capacity and the input of load unit
Connection；The other end of first electric capacity, the other end ground connection of the second electric capacity.
Further, the detection of power loss unit includes first voltage detection circuit, second voltage detection circuit, the 3rd electricity
Pressure detection circuit, first comparator and the second comparator；The output end of the power subsystem is defeated with first voltage detection circuit
Enter end connection；The output end of the load unit is connected with the input of second voltage detection circuit；The charge storage unit it is defeated
The input for going out end with tertiary voltage detection circuit is connected；The output end of the first voltage detection circuit, second voltage detection
The output end of circuit is connected with the input of first comparator respectively；The output end of the first comparator respectively with charge control
The input connection of the input of unit, the input of control of discharge unit, load unit；The second voltage detection circuit
The input of output end, the output end of tertiary voltage detection circuit respectively with the second comparator is connected, second comparator
The input connection of the output end of output end and first comparator, charging control circuit.
Further, first voltage detection circuit includes the first divider resistance and the second divider resistance, and described first
The output end of one end of divider resistance and power subsystem connects, the other end of first divider resistance and the second divider resistance
One end, the in-phase input end connection of first comparator, the other end ground connection of second divider resistance；The second voltage detection
Circuit includes the 3rd divider resistance and the 4th divider resistance, and one end of the 3rd divider resistance and the output end of load unit connect
Connect, the other end of the 3rd divider resistance and one end of the 4th divider resistance, the inverting input of first comparator, the second ratio
In-phase input end compared with device connects, the other end ground connection of the 4th divider resistance；Tertiary voltage detection circuit includes the
The output end of five divider resistances and the 6th divider resistance, one end of the 5th divider resistance and charge storage unit connects, and described the
The other end of five divider resistances is connected with one end of the 6th divider resistance, the inverting input of the second comparator, described 6th point
The other end ground connection of piezoresistance.
Further, ratio, the 3rd divider resistance and the 4th partial pressure of first divider resistance and the second divider resistance
The ratio of the ratio of resistance, the 5th divider resistance and the 6th divider resistance is identical.
Further, the charging control unit includes first switch pipe and second switch pipe, the detection of power loss unit
Output end be connected with the control terminal of first switch pipe, the negative output terminal of first switch pipe ground connection, the first switch pipe
Positive output end be connected with the control terminal of second switch pipe, the negative output terminal of the second switch pipe and the output end of power subsystem
Connection, the positive output end of the second switch pipe and the input of charge storage unit connect.
Further, the control of discharge unit includes the 3rd switching tube, the output end of the detection of power loss unit and the
The control terminal connection of three switching tubes, the output end of the charge storage unit are connected with the negative output terminal of the 3rd switching tube, and the described 3rd
The positive output end of switching tube and the input of load unit connect.
Another technical scheme of the present invention is：A kind of power-down retaining method, electricity is kept applied to described power down
Road,
Detection of power loss unit detects the output signal of power subsystem, the input signal of load unit with output control signal control
The work of charging control unit processed and control of discharge unit；
When detection of power loss unit detects power subsystem power down, output control signal control charging control unit disconnects,
And output control signal control control of discharge unit is turned on to realize that charge storage unit is powered to load unit.
Further, the output voltage of detection of power loss unit detection power subsystem, the output voltage of charge storage unit with
And the input voltage of load unit；
When the output voltage of the power subsystem is less than the input voltage of load unit, i.e., described power subsystem power down,
The detection of power loss unit control charging control unit disconnects；The detection of power loss unit control control of discharge unit conducting, institute
Charge storage unit is stated to power to load unit；
The input voltage for being more than the input voltage of load unit and load unit when the output voltage of the power subsystem is big
When the output voltage of charge storage unit, the detection of power loss unit control control of discharge unit disconnects；The detection of power loss unit
Charging control unit conducting is controlled, the power subsystem charges to charge storage unit.
The beneficial effects of the invention are as follows：
The present invention detects the output signal of power subsystem, the input signal of load unit to export by detection of power loss unit
Control signal controls the work of charging control unit and control of discharge unit, when realizing power subsystem power down, charging control unit
It is disconnected, control of discharge unit is switched on so that charge storage unit realizes that power down is kept, ensure load unit to load unit power supply
Have abundance safety power supply be used to back up important information during power down, and be avoided that charge storage unit put when filling caused by state
Unstable, proof load unit can normal table work when power down is kept.
Brief description of the drawings
The embodiment of the present invention is described further below in conjunction with the accompanying drawings：
Fig. 1 is an a kind of specific embodiment structured flowchart of power-down retaining circuit of the present invention；
Fig. 2 is an a kind of specific embodiment structured flowchart of the detection of power loss unit of power-down retaining circuit of the present invention；
Fig. 3 is a kind of specific embodiment circuit theory diagrams of power-down retaining circuit of the present invention；
Fig. 4 is an a kind of specific embodiment voltage oscillogram of the input voltage vin of power-down retaining circuit of the present invention；
Fig. 5 is a kind of specific embodiment voltage of the output voltage of the detection of power loss unit of power-down retaining circuit of the present invention
Oscillogram；
Fig. 6 is a kind of output voltage Vout and tank voltage Vcap of power-down retaining circuit a specific embodiment of the present invention
Voltage oscillogram.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.
A kind of power-down retaining circuit, with reference to figure 1, Fig. 1 is an a kind of specific embodiment knot of power-down retaining circuit of the present invention
Structure block diagram, power-down retaining circuit are used for when main power supply circuit powers off, provide electric energy for load unit, have with proof load unit
Electric energy backup important information, main power supply circuit include power subsystem and load supplying unit, the output end of power subsystem and load
The input connection of power supply unit, the output end of load supplying unit and the input of load unit connect；In the present embodiment, electricity
Source unit is dc source, and power supply is provided for circuit；Load supplying unit is used for the voltage conversion by power subsystem input into can
For the voltage of load unit work, load supplying unit is usually to utilize DC-DC power source conversion chip or LDO power supply chips
Carry out voltage conversion；
Power-down retaining circuit also includes detection of power loss unit, charging control unit, charge storage unit and control of discharge unit；Electricity
The output end of source unit and the input of charging control unit, the input of detection of power loss unit connect；The output of charge storage unit
The input with detection of power loss unit, the input of control of discharge unit are connected respectively at end；Load unit and detection of power loss unit
Connection；The input with charging control unit, the input of control of discharge unit are connected the output end of detection of power loss unit respectively
To control charging control unit, the break-make of control of discharge unit；The output end of charging control unit and the input of charge storage unit
Connection；The output end of control of discharge unit and the input of load unit connect.
The present invention sets detection of power loss unit to carry out detection of power loss to control charging control unit and control of discharge unit
Work, and power down occurs for notification payload unit, then load unit has the safety power supply backup important information of abundance when power down is kept,
And be avoided that charge storage unit put when filling caused by state labile, proof load unit can be normally steady when power down is kept
Fixed work.Usually, load unit is the programming device such as the CPU with control function, or other functional circuits.Load unit
Normal work could be kept by needing lasting power supply to supply.When power subsystem powered-off fault, load unit is from detection of power loss list
After member is notified, and Core Feature operating is kept using the power supply of charge storage unit, and start shutdown programm, back up important letter
Breath.
As the further improvement of technical scheme, with reference to figure 2, Fig. 2 is a kind of power down inspection of power-down retaining circuit of the present invention
A specific embodiment structured flowchart of unit is surveyed, detection of power loss unit includes first voltage detection circuit, second voltage detection electricity
Road, tertiary voltage detection circuit, first comparator and the second comparator；The output end of power subsystem and first voltage detection circuit
Input connect to detect the output voltage of power subsystem；The output end of load unit and the input of second voltage detection circuit
End is connected to detect the input voltage of load unit；The output end of charge storage unit is connected with the input of tertiary voltage detection circuit
To detect the output voltage of charge storage unit；Output end, the output end point of second voltage detection circuit of first voltage detection circuit
It is not connected with the input of first comparator；The input with charging control unit, the electric discharge respectively of the output end of first comparator
The input connection of the input, load unit of control unit；The output end of second voltage detection circuit, tertiary voltage detection electricity
Input of the output end on road respectively with the second comparator is connected, the output of the output end and first comparator of the second comparator
End, the input connection of charging control circuit.
Specifically, referring to figs. 2 and 3 Fig. 3 is an a kind of specific embodiment circuit theory of power-down retaining circuit of the present invention
Figure, wherein, load supplying unit 5 is simulated using diode D1, and load unit 6 is simulated using RL2, and power subsystem is used
Vin represents power input.The first voltage detection circuit of detection of power loss unit 1 includes the first divider resistance R4 and the second partial pressure electricity
R12 is hindered, the first divider resistance R4 one end and the output end of power subsystem connect, the first divider resistance R4 other end and second
Divider resistance R12 one end, first comparator U3A in-phase input end connection, the second divider resistance R12 other end ground connection；
Second voltage detection circuit includes the 3rd divider resistance R11 and the 4th divider resistance R13, the 3rd divider resistance R11 one end and
The output end connection of load unit 6, the 3rd divider resistance R11 other end is compared with the 4th divider resistance R13 one end, first
The in-phase input end connection of device U3A inverting input, the second comparator U3B, the 4th divider resistance R13 other end ground connection；
Tertiary voltage detection circuit includes the 5th divider resistance R5 and the 6th divider resistance R10, the 5th divider resistance R5 one end and storage
The output end connection of electric unit 3, the 5th divider resistance R5 other end and the 6th divider resistance R10 one end, the second comparator
U3B inverting input connection, the 6th divider resistance R10 other end ground connection.Further, the first divider resistance R4 and second
Ratio, the 5th divider resistance R5 and the 6th of divider resistance R12 ratio, the 3rd divider resistance R11 and the 4th divider resistance R13
Divider resistance R10 ratio is identical.
Wherein, the first divider resistance R4 and the second divider resistance R12 forms bleeder circuit to gather the input of power subsystem
Voltage Vin (i.e. the output voltage of power subsystem), resistance R9 are first comparator U3A input build-out resistors.Second partial pressure electricity
Resistance R11 and the 4th divider resistance R13 form bleeder circuit to gather output voltage Vout (i.e. the input voltage of load unit), and two
Individual control source first comparator U3A is compared.5th divider resistance R5 and the 6th divider resistance R10 forms bleeder circuit to adopt
Collect tank voltage Vcap (i.e. the output voltage of charge storage unit), output voltage Vout and the tank voltage Vcap two of charge storage unit
The second comparator of control source U3B is compared.
As the further improvement of technical scheme, referring to figs. 2 and 3, charging control unit 2 include first switch pipe M1 and
Second switch pipe M2, the output end of detection of power loss unit 1 are connected with first switch pipe M1 control terminal, and first switch pipe M1's is negative
Output head grounding, first switch pipe M1 positive output end are connected with second switch pipe M2 control terminal, and second switch pipe M2's is negative
Output end and the output end of power subsystem are connected, and second switch pipe M2 positive output end is connected with the input of charge storage unit 3.This
In embodiment, first switch pipe M1 and second switch pipe M2 are PMOS, and the grid of PMOS is the control terminal of switching tube, PMOS
The source electrode of pipe is the negative output terminal of switching tube, and the drain electrode of PMOS is the positive output end of switching tube.In addition, charging control unit 2
Also include the first diode D3, the second diode D4, resistance R8 and resistance R2, first switch pipe M1 control terminal and the one or two pole
Pipe D3 positive pole connection, the first diode D3 negative pole are connected with first comparator U3A output end, and the first diode D3 is just
Pole is connected with resistance R8 one end, the second diode D4 positive pole, and resistance R8 one end is connected with supply voltage, and the one of resistance R2
End is connected with second switch pipe M2 control terminal, and the resistance R2 other end is connected with second switch pipe M2 negative output terminal, and second
Diode D4 negative pole is connected with the second comparator U3B output end.
As the further improvement of technical scheme, referring to figs. 2 and 3 charge storage unit 3 includes storing up electricity electric capacity C3 and resistance
R1, storing up electricity electric capacity C3 one end and the output end of charging control unit 2, the input of control of discharge unit 4, detection of power loss unit
1 input connection, storing up electricity electric capacity C3 other end ground connection.Resistance R1 is the charging that current-limiting resistance is used for controlling storage capacitor C3
The size of electric current, specifically, storage capacitor C3 are super capacitor, and second switch pipe M2 positive output end connects with resistance R1 one end
Connect, the resistance R1 other end is connected with storage capacitor C3 positive pole, the 3rd divider resistance R5 one end, storage capacitor C3 negative pole
Ground connection.
In fact, by the super capacitor from Reasonable Parameters, when power down is kept, after charge storage unit 3 opens electric discharge, store up
The electric energy that electric unit 3 stores is available for load unit 6 to postpone work 10 seconds or so, to ensure that load unit can be located under powering-off state
Reason is abnormal or carries out data backup storage.
As the further improvement of technical scheme, referring to figs. 2 and 3, control of discharge unit 4 includes the 3rd switching tube M3,
The output end of detection of power loss unit 1 is connected with the 3rd switching tube M3 control terminal, the output end of charge storage unit 3 and the 3rd switching tube
M3 negative output terminal connection, the 3rd switching tube M3 positive output end are connected with the input of load unit 6.In the present embodiment, the
Three switching tube M3 are PMOS, and the grid of PMOS is the control terminal of switching tube, and the source electrode of PMOS is the negative output of switching tube
End, the drain electrode of PMOS are the positive output end of switching tube.In fact, control of discharge unit 4 also includes resistance R3, storage capacitor C3
Positive pole be connected with resistance R3 one end, the 3rd switching tube M3 negative output terminal, the 3rd switching tube M3 control terminal with first ratio
Output end connection (ctr-discharge in such as Fig. 3) compared with device U3A, the 3rd switching tube M3 positive output end and load unit
6 input connection, in addition, first comparator U3A output end is connected with the input of load unit 6 (passes through ctr-
discharge)。
With reference to figure 3, when reality is started working, on circuit after electricity, then input voltage vin is more than output voltage Vout, output
Voltage Vout rises, tank voltage Vcap no-voltages, and load unit starts normal work.When input voltage vin is more than or equal to defeated
When going out voltage Vout, first comparator U3A output high level, now, the 3rd switching tube M3 control terminal is drawn by resistance R3
For high level, the 3rd switching tube M3 is not turned on, and control of discharge unit 4 is not turned on, and power subsystem 3 does not discharge load unit 6, and
Voltage by the now power subsystem of ctr-discharge notification payloads unit 6 is normal, meanwhile, first switch pipe M1 and second
Switching tube M2 is switched on, it is allowed to which power subsystem charges (now power subsystem does not charge to charge storage unit) to charge storage unit.
Now, if output voltage Vout is more than tank voltage Vcap, the second comparator U3B output high level, first switch pipe M1 is led
Logical, then second switch pipe M2 is switched on, and power subsystem is charged to charge storage unit 3.If output voltage Vout is less than energy storage electricity
Press Vcap, then the second comparator U3B exports low level, and first switch pipe M1 and second switch pipe M2 be not turned on, power subsystem without
Method charges to charge storage unit 3.Until input voltage vin is fallen, i.e. power down, then input voltage vin be less than output voltage
Vout, first comparator U3A export low level so that the 3rd switching tube M3 control terminal is low level, so as to the 3rd switching tube
M3 is switched on, and charge storage unit 3, which starts to discharge to load unit, provides delay power supply, and tank voltage Vcap is slowly reduced, output electricity
Pressure Vout is slowly reduced, load unit normal work.Now, first switch pipe M1 and second switch pipe M2 are not turned on, power supply list
Member can not charge to charge storage unit 3, while the power down of the power subsystem of notification payload unit 6；Until tank voltage
Vcap reduces sufficiently low until being 0, load unit 6 actively shuts down.
With reference to figure 3, when first comparator U3A and the second comparator U3B allows to charge to charge storage unit, output is all
Open-drain state, it is high level by resistance R7, resistance R14 pull-up, because diode D3, diode D4 one-way conduction act on,
So first switch pipe M1 working condition is not influenceed.Now output voltage VCC (the i.e. output voltages of load supplying unit
Vout control terminal high level of the resistance R8 to first switch pipe M1, first switch pipe M1 conductings, by second switch pipe M2's) are passed through
Control terminal moves low level to so that has Negative Pressure Difference on resistance R2, so as to which second switch pipe M2 is switched on, power subsystem gives storing up electricity list
Member charging.This operation can, when tank voltage Vcap is less than output voltage Vout, can charge in time, and guarantee has abundance
Electric energy storage.
With reference to figure 3, when first comparator U3A allows to charge to charge storage unit, export as high level, the 3rd can be controlled
Switching tube M3 control terminal is high level, so as to forbid discharging.This operation be avoided that charge storage unit put when filling caused by shape
State is unstable.
With reference to figure 3, when first comparator U3A and any one in the second comparator U3B forbid charging, all output is low electricity
It is flat, then low level to can be moved first switch pipe M1 control terminal by diode D3 or diode D4 so that first switch
Pipe M1 is turned off, so as to which resistance R2 both end voltages in the presence of the input voltage vin of power subsystem are identical so that second switch pipe
M2 is not turned on, and power subsystem does not charge to charge storage unit.This operation can avoid charge storage unit from overcharging.
It is an a kind of specific implementation of the input voltage vin of power-down retaining circuit of the present invention with reference to figure 4, Fig. 5 and Fig. 6, Fig. 4
Example voltage oscillogram；Fig. 5 is an a kind of specific implementation of the output voltage of the detection of power loss unit of power-down retaining circuit of the present invention
Example voltage oscillogram；Fig. 6 is the one specific of the present invention a kind of the output voltage Vout and tank voltage Vcap of power-down retaining circuit
Embodiment voltage oscillogram；It can be seen that after electricity in input voltage vin, the output voltage Vctr- of detection of power loss unit
Discharge is that high level is forbidden discharging, and allows to charge, and tank voltage Vcap gradually rises, until close to input voltage vin
When stop charging.After input voltage vin power down, control of discharge voltage Vctr-discharge falls rapidly, and this semaphore leads to
Know that the output voltage (i.e. input voltage vin) of power subsystem has to fall, and control control of discharge unit to turn on, charge storage unit is to negative
Carrier unit is discharged, and can see that tank voltage Vcap starts to discharge afterwards, and voltage slowly declines, while output voltage Vout is protected
Hold basicly stable, slowly decline, but still maintenance voltage can keep load unit normal work, realize in more than 2.0V
Delaying shutdown.
As the further improvement of technical scheme, with reference to figure 3, power-down retaining circuit also includes output voltage regulation unit 7, electric discharge
The output end of control unit 4 is connected by exporting voltage regulation unit 7 with the input of load unit 6.Further, voltage stabilizing list is exported
Member 7 includes the first electric capacity C1 and the second electric capacity C2, the first electric capacity C1 positive pole and the second electric capacity C2 positive pole, control of discharge unit
4 output end connection, the second electric capacity C2 one end is connected with the input of load unit 6；First electric capacity C1 negative pole, the second electricity
Hold C2 negative pole ground connection.First electric capacity C1 and the second electric capacity C2 are used for regulated output voltage.In addition, output voltage regulation unit 7 also wraps
Diode D5 is included, diode D5 can prevent that load supplying unit 5 (i.e. VCC) is charged back to charge storage unit 3.
The present invention is capable of the situation of automatic detection input block power supply normal power down (such as battery exhausts) or abnormal power-down,
Timely notification payload unit, and the electric energy laid in when controlling charge storage unit by normal power supply discharges, and gives load unit power supply
Ensure delay work for a period of time, to preserve important data.Independence is high, can independently detect power-off signal, and switch electricity
Delaying shutdown is realized on road, is participated in without main control unit or extra programming device.Circuit is simple, it is thus only necessary to which 1 pair relatively
Device (first comparator and the second comparator), 3 mos pipes and a small amount of resistor-capacitor unit can realize that automatically delaying shuts down, it is not necessary to
Program control IC chip, it is not necessary to programming Control.Cost is cheap, securely and reliably, because independence is high, autonomous detection, and circuit is simple,
It is so more safe and reliable.
A kind of power-down retaining method, applied to described power-down retaining circuit, with reference to figure 1, specifically：
Detection of power loss unit detects the output signal of power subsystem, the input signal of load unit with output control signal control
The work of charging control unit processed and control of discharge unit；
When detection of power loss unit detects power subsystem power down, output control signal control charging control unit disconnects,
And output control signal control control of discharge unit is turned on to realize that charge storage unit is powered to load unit.
The present invention detects the output signal of power subsystem, the input signal of load unit to export by detection of power loss unit
Control signal controls the work of charging control unit and control of discharge unit, when realizing power subsystem power down, charging control unit
It is disconnected, control of discharge unit is switched on so that charge storage unit realizes that power down is kept, ensure load unit to load unit power supply
Have abundance safety power supply be used to back up important information during power down, and be avoided that charge storage unit put when filling caused by state
Unstable, proof load unit can normal table work when power down is kept.
As the further improvement of technical scheme, with reference to figure 1 and Fig. 3, detection of power loss unit detects the output of power subsystem
The input voltage of voltage, the output voltage of charge storage unit and load unit；
When the output voltage of power subsystem is less than the input voltage of load unit, i.e. power subsystem power down, detection of power loss
Unit control charging control unit disconnects；The control control of discharge unit conducting of detection of power loss unit, charge storage unit is to load unit
Power supply realizes that power down is kept；
When the input voltage of input voltage and load unit that the output voltage of power subsystem is more than load unit is more than storage
During the output voltage of electric unit, detection of power loss unit control control of discharge unit disconnects；Detection of power loss unit controls charge control
Unit turns on, and power subsystem charges to charge storage unit.
When the input voltage of input voltage or load unit that the output voltage of power subsystem is less than load unit is less than storage
During the output voltage of electric unit, charging control unit disconnects, and power subsystem does not charge to charge storage unit.
Above is the preferable implementation to the present invention is illustrated, but the invention is not limited to the implementation
Example, those skilled in the art can also make a variety of equivalent variations on the premise of without prejudice to spirit of the invention or replace
Change, these equivalent deformations or replacement are all contained in the application claim limited range.
Claims (10)
1. a kind of power-down retaining circuit, including power subsystem, load supplying unit and load unit, the output of the power subsystem
End is connected with the input of load supplying unit, and the output end of the load supplying unit and the input of load unit connect；
Characterized in that,
The power-down retaining circuit also includes detection of power loss unit, charging control unit, charge storage unit and control of discharge unit；
The output end of the power subsystem and the input of charging control unit, the input of detection of power loss unit connect；It is described
The input with detection of power loss unit, the input of control of discharge unit are connected the output end of charge storage unit respectively；The load
Unit is connected with detection of power loss unit；The output end of the detection of power loss unit respectively the input with charging control unit, put
The input of electric control unit is connected to control charging control unit, the break-make of control of discharge unit；The charging control unit
Output end and charge storage unit input connect；The output end of the control of discharge unit and the input of load unit connect
Connect.
2. a kind of power-down retaining circuit according to claim 1, it is characterised in that the power-down retaining circuit also includes defeated
Go out voltage regulation unit, the output end of the control of discharge unit connects by exporting the input of voltage regulation unit and load unit.
3. a kind of power-down retaining circuit according to claim 2, it is characterised in that the output voltage regulation unit includes first
Electric capacity and the second electric capacity, one end of first electric capacity are connected with the output end of one end of the second electric capacity, control of discharge unit, institute
State one end of the second electric capacity and the input of load unit connects；The other end, the other end of the second electric capacity of first electric capacity
Ground connection.
4. a kind of power-down retaining circuit according to claim 1, it is characterised in that the detection of power loss unit includes first
Voltage detecting circuit, second voltage detection circuit, tertiary voltage detection circuit, first comparator and the second comparator；The electricity
The output end of source unit is connected with the input of first voltage detection circuit；The output end of the load unit is examined with second voltage
The input connection of slowdown monitoring circuit；The output end of the charge storage unit is connected with the input of tertiary voltage detection circuit；Described
Output end, the output end of second voltage detection circuit of one voltage detecting circuit are connected with the input of first comparator respectively；
The input with charging control unit, the input of control of discharge unit, load are single respectively for the output end of the first comparator
The input connection of member；The output end of second voltage detection circuit, the output end of tertiary voltage detection circuit are respectively with the
The input connection of two comparators, the output end of second comparator and output end, the charging control circuit of first comparator
Input connection.
5. a kind of power-down retaining circuit according to claim 4, it is characterised in that the first voltage detection circuit includes
First divider resistance and the second divider resistance, one end of first divider resistance and the output end of power subsystem connect, described
The other end of first divider resistance is connected with one end of the second divider resistance, the in-phase input end of first comparator, and described second
The other end ground connection of divider resistance；The second voltage detection circuit includes the 3rd divider resistance and the 4th divider resistance, described
One end of 3rd divider resistance and the output end of load unit connect, the other end of the 3rd divider resistance and the 4th partial pressure electricity
One end of resistance, the in-phase input end connection of the inverting input of first comparator, the second comparator, the 4th divider resistance
The other end is grounded；The tertiary voltage detection circuit includes the 5th divider resistance and the 6th divider resistance, the 5th partial pressure electricity
One end of resistance and the output end connection of charge storage unit, the other end of the 5th divider resistance and one end of the 6th divider resistance,
The inverting input connection of second comparator, the other end ground connection of the 6th divider resistance.
6. a kind of power-down retaining circuit according to claim 5, it is characterised in that first divider resistance and second point
The ratio of piezoresistance, the ratio of the 3rd divider resistance and the 4th divider resistance, the ratio of the 5th divider resistance and the 6th divider resistance
It is worth identical.
A kind of 7. power-down retaining circuit according to any one of claim 1 to 6, it is characterised in that the charge control list
Member includes first switch pipe and second switch pipe, and the output end of the detection of power loss unit connects with the control terminal of first switch pipe
Connect, the negative output terminal ground connection of the first switch pipe, the positive output end of the first switch pipe and the control terminal of second switch pipe
Connection, the negative output terminal of the second switch pipe and the output end of power subsystem connect, the positive output end of the second switch pipe
It is connected with the input of charge storage unit.
A kind of 8. power-down retaining circuit according to any one of claim 1 to 6, it is characterised in that the control of discharge list
Member includes the 3rd switching tube, and the output end of the detection of power loss unit is connected with the control terminal of the 3rd switching tube, the storing up electricity list
The output end of member is connected with the negative output terminal of the 3rd switching tube, the input of the positive output end and load unit of the 3rd switching tube
End connection.
A kind of 9. power-down retaining method, applied to the power-down retaining circuit described in any one of claim 1 to 8, it is characterised in that
Output signal, the input signal of load unit of detection of power loss unit detection power subsystem are filled with output control signal control
The work of electric control unit and control of discharge unit；
When detection of power loss unit detects power subsystem power down, output control signal control charging control unit disconnects, and defeated
Go out control signal control control of discharge unit conducting to realize that charge storage unit is powered to load unit.
A kind of 10. power-down retaining method according to claim 9, it is characterised in that the detection of power loss unit detection electricity
The input voltage of the output voltage of source unit, the output voltage of charge storage unit and load unit；
When the output voltage of the power subsystem is less than the input voltage of load unit, i.e., described power subsystem power down is described
Detection of power loss unit control charging control unit disconnects；The detection of power loss unit control control of discharge unit conducting, the storage
Electric unit is powered to load unit；
When the input voltage of input voltage and load unit that the output voltage of the power subsystem is more than load unit is more than storage
During the output voltage of electric unit, the detection of power loss unit control control of discharge unit disconnects；The detection of power loss unit control
Charging control unit turns on, and the power subsystem charges to charge storage unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710821349.5A CN107681885B (en) | 2017-09-12 | 2017-09-12 | A kind of power-down retaining circuit and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710821349.5A CN107681885B (en) | 2017-09-12 | 2017-09-12 | A kind of power-down retaining circuit and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107681885A true CN107681885A (en) | 2018-02-09 |
| CN107681885B CN107681885B (en) | 2019-09-17 |
Family
ID=61134748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710821349.5A Active CN107681885B (en) | 2017-09-12 | 2017-09-12 | A kind of power-down retaining circuit and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107681885B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109144218A (en) * | 2018-06-19 | 2019-01-04 | 北京海博思创科技有限公司 | Power-down protection apparatus and terminal |
| CN110307142A (en) * | 2019-06-28 | 2019-10-08 | 大唐半导体科技有限公司 | A kind of control method and air compressor machine of air compressor machine |
| CN110333769A (en) * | 2019-07-25 | 2019-10-15 | 广东浪潮大数据研究有限公司 | Power switching circuit and system based on super capacitor on a kind of storage card |
| CN111800008A (en) * | 2019-04-01 | 2020-10-20 | Ls电气株式会社 | Output voltage stabilizing device |
| CN112313601A (en) * | 2020-04-24 | 2021-02-02 | 上海商汤临港智能科技有限公司 | Vehicle, visual field controller, video data processing method, apparatus and medium |
| WO2021051636A1 (en) * | 2019-09-17 | 2021-03-25 | 中兴通讯股份有限公司 | Power failure protection circuit and method, data protection method, and electronic product |
| CN112636572A (en) * | 2020-12-04 | 2021-04-09 | 佛山市顺德区美的电子科技有限公司 | Air conditioner control method, device, equipment, air conditioner and medium |
| CN113109738A (en) * | 2021-03-15 | 2021-07-13 | 苏州汇川技术有限公司 | Power-down time detection circuit and power-down time detection system |
| CN113708472A (en) * | 2021-07-23 | 2021-11-26 | 西安特锐德智能充电科技有限公司 | Power supply circuit and control method and control system thereof |
| WO2023104196A1 (en) * | 2021-12-10 | 2023-06-15 | 广东省新一代通信与网络创新研究院 | Power failure alarm circuit for communication device, power failure alarm processing method for communication device, and communication device |
| WO2024087737A1 (en) * | 2022-10-26 | 2024-05-02 | 深圳市汇川技术股份有限公司 | Circuit having power failure detection and power supply holding functions, and electronic device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1267116A (en) * | 1999-03-11 | 2000-09-20 | 神达电脑股份有限公司 | Charging-discharging device |
| JP2005214925A (en) * | 2004-02-02 | 2005-08-11 | Fuji Electric Fa Components & Systems Co Ltd | Power failure detection circuit |
| CN201001039Y (en) * | 2006-12-29 | 2008-01-02 | 深圳市振华微电子有限公司 | Great current DC power supply instant power-off retaining circuit |
| CN203457044U (en) * | 2013-09-27 | 2014-02-26 | 南京国睿新能电子有限公司 | Ultra long time power failure holding circuit |
| CN105790358A (en) * | 2016-04-08 | 2016-07-20 | 北京奇虎科技有限公司 | Battery charging circuit |
-
2017
- 2017-09-12 CN CN201710821349.5A patent/CN107681885B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1267116A (en) * | 1999-03-11 | 2000-09-20 | 神达电脑股份有限公司 | Charging-discharging device |
| JP2005214925A (en) * | 2004-02-02 | 2005-08-11 | Fuji Electric Fa Components & Systems Co Ltd | Power failure detection circuit |
| CN201001039Y (en) * | 2006-12-29 | 2008-01-02 | 深圳市振华微电子有限公司 | Great current DC power supply instant power-off retaining circuit |
| CN203457044U (en) * | 2013-09-27 | 2014-02-26 | 南京国睿新能电子有限公司 | Ultra long time power failure holding circuit |
| CN105790358A (en) * | 2016-04-08 | 2016-07-20 | 北京奇虎科技有限公司 | Battery charging circuit |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109144218A (en) * | 2018-06-19 | 2019-01-04 | 北京海博思创科技有限公司 | Power-down protection apparatus and terminal |
| CN111800008A (en) * | 2019-04-01 | 2020-10-20 | Ls电气株式会社 | Output voltage stabilizing device |
| CN110307142A (en) * | 2019-06-28 | 2019-10-08 | 大唐半导体科技有限公司 | A kind of control method and air compressor machine of air compressor machine |
| CN110307142B (en) * | 2019-06-28 | 2020-09-29 | 大唐半导体科技有限公司 | Control method of air compressor and air compressor |
| CN110333769A (en) * | 2019-07-25 | 2019-10-15 | 广东浪潮大数据研究有限公司 | Power switching circuit and system based on super capacitor on a kind of storage card |
| WO2021051636A1 (en) * | 2019-09-17 | 2021-03-25 | 中兴通讯股份有限公司 | Power failure protection circuit and method, data protection method, and electronic product |
| CN112313601A (en) * | 2020-04-24 | 2021-02-02 | 上海商汤临港智能科技有限公司 | Vehicle, visual field controller, video data processing method, apparatus and medium |
| CN112313601B (en) * | 2020-04-24 | 2023-07-07 | 上海商汤临港智能科技有限公司 | Vehicle, vision domain controller, video data processing method, apparatus and medium |
| CN112636572A (en) * | 2020-12-04 | 2021-04-09 | 佛山市顺德区美的电子科技有限公司 | Air conditioner control method, device, equipment, air conditioner and medium |
| CN113109738A (en) * | 2021-03-15 | 2021-07-13 | 苏州汇川技术有限公司 | Power-down time detection circuit and power-down time detection system |
| CN113109738B (en) * | 2021-03-15 | 2023-08-04 | 苏州汇川技术有限公司 | Power-down time detection circuit and power-down time detection system |
| CN113708472A (en) * | 2021-07-23 | 2021-11-26 | 西安特锐德智能充电科技有限公司 | Power supply circuit and control method and control system thereof |
| WO2023104196A1 (en) * | 2021-12-10 | 2023-06-15 | 广东省新一代通信与网络创新研究院 | Power failure alarm circuit for communication device, power failure alarm processing method for communication device, and communication device |
| WO2024087737A1 (en) * | 2022-10-26 | 2024-05-02 | 深圳市汇川技术股份有限公司 | Circuit having power failure detection and power supply holding functions, and electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107681885B (en) | 2019-09-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107681885A (en) | A kind of power-down retaining circuit and method | |
| CN106965761B (en) | Power-off protection device for vehicle-mounted equipment system | |
| US20170170653A1 (en) | Explosion-proof circuit, charging circuit and charging/discharging protection circuit of battery | |
| CN102280924B (en) | Uninterrupted power supply system for relay protection device | |
| CN103092315A (en) | Mobile terminal capable of recovering application program after restart | |
| CN104701927A (en) | Secondary protection IC, method of controlling secondary protection IC, protection module, and battery pack | |
| CN208874344U (en) | Main power source and backup power source switching circuit and switching device | |
| CN206850517U (en) | The double-input uninterrupted voltage-stabilizing switch power source of paralleling switch type | |
| CN203434637U (en) | Energy storage system | |
| CN111193317A (en) | Power-down protection circuit for terminal equipment | |
| CN201523210U (en) | Spontaneous power supply protecting device based on dynamic power supply path management technology | |
| CN106328179A (en) | Power supply circuit and power supply method | |
| CN109599919B (en) | BMS overvoltage and undervoltage protection circuit | |
| CN103595034A (en) | Closed-loop surge elimination circuit | |
| CN107634577B (en) | Power-off detection control circuit and gas meter | |
| CN203826946U (en) | Cell explosionproof circuit and cell charging circuit | |
| CN203014439U (en) | Automatic identification apparatus of charger | |
| CN208062858U (en) | A kind of electric power management circuit for hand-held equipment | |
| CN210427768U (en) | Power supply access state detection circuit and electronic device | |
| CN205028661U (en) | Supply circuit and power management circuit | |
| CN209250219U (en) | A kind of under-voltage delay protection device of power supply | |
| CN204030564U (en) | Power-supply battery protective device | |
| CN202004738U (en) | Electronic safety switch controlled by MOS (metal oxide semiconductor) tube | |
| CN203707835U (en) | Non-power-failure apparatus for battery replacement | |
| WO2021103099A1 (en) | Power control communication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A power failure holding circuit and method Effective date of registration: 20210506 Granted publication date: 20190917 Pledgee: Shenzhen hi tech investment small loan Co.,Ltd. Pledgor: RENCARE MEDICAL INSTRUMENTS Co.,Ltd. Registration number: Y2021980003301 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |