CN107046323A - A kind of power-down protection circuit - Google Patents
A kind of power-down protection circuit Download PDFInfo
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- CN107046323A CN107046323A CN201710252709.4A CN201710252709A CN107046323A CN 107046323 A CN107046323 A CN 107046323A CN 201710252709 A CN201710252709 A CN 201710252709A CN 107046323 A CN107046323 A CN 107046323A
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- 230000005611 electricity Effects 0.000 claims abstract description 59
- 239000003990 capacitor Substances 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 58
- 238000009825 accumulation Methods 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims 1
- 238000004146 energy storage Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004321 preservation Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004826 seaming Methods 0.000 description 1
Classifications
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of power-down protection circuit, it is related to electronic technology field；The circuit includes electricity storage circuit and power sense circuit；The electricity storage circuit is used to be stored the part electric energy in input power, and in the input power power down, the storage electric energy of the electricity storage circuit is exported to electronic equipment；The state of the power sense circuit detection input power, and testing result is fed back into the electronic equipment.Electricity storage circuit of the present invention carries out energy storage using Large Copacity solid-state storage capacitor, the power-down protection apparatus is worked under the complex environments such as wide temperature, high humidity environment.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of power-down protection circuit.
Background technology
Often there is powering-off state in course of normal operation due to abnormal electrical power supply in electronic product, if not having in electronic product
Have provided with reserve battery, unexpected powering-off state can then cause the unexpected termination that program is run, so as to cause the number for being stored in caching
Lost according to due to not preserved in time, more seriously can then cause electronic product to break down.
In the prior art solution, stand-by power supply is used as using battery or farad capacitor.Falling electronic product
It can be delayed after electric operation a period of time.So that in electronic product cache in some data to preserve, and it is some other should
Anxious processing.But in complex environment such as high temperature, low temperature or high humidity environment, battery or farad capacitor tend not to normal work
Make.
The content of the invention
In view of this, the embodiment of the present invention provides a kind of power-down protection circuit, it is therefore intended that solve prior art in complexity
In environment battery or farad capacitor as stand-by power supply can not normal work the problem of.The technical side that the embodiment of the present invention is used
Case is:
The embodiment of the present invention provides a kind of power-down protection circuit, and the power-down protection circuit includes：Electricity storage circuit and
Power sense circuit；
The electricity storage circuit is used to be stored the part electric energy in input power, and falls in the input power
When electric, the storage electric energy of the electricity storage circuit is exported to electronic equipment；
Testing result is fed back to the electronics and set with detecting the state of the input power by the power sense circuit
It is standby.
Further, the electricity storage circuit includes the first diode, first resistor, the 3rd electric capacity and the two or two pole
Pipe；
One end of first diode is connected with described first resistor one end and out-put supply respectively, the first resistor
The other end is connected with described 3rd electric capacity one end, and the 3rd electric capacity other end is connected with described second diode one end, described
The second diode other end is connected with the out-put supply；
First diode is used for the electricity storage circuit and the one-way conduction of the input power, prevents the electricity
The accumulation power supply of amount storage circuit flows to the input power；
The first resistor is used for the charging battery of the 3rd electric capacity, so that the capacitive character for reducing the 3rd electric capacity is born
Carry the impact to the input supply voltage；
3rd electric capacity is used for the storage of the electric energy inputted to the first resistor；
Second diode is used to out-put supply is switched into the 3rd electric capacity during input power power down.
Further, first diode uses internal resistance for the low pressure drop diode of zero ohm level, so as to reduce described
The pressure difference of the voltage of first diode output and the voltage of input；
The first resistor uses high-power resistance；
3rd electric capacity uses Large Copacity solid-state storage capacitor, and the 3rd electric capacity quantity is described more no less than one
Individual 3rd electric capacity is connected in parallel, so as to increase the power storage amount of electric capacity；
Second diode uses internal resistance for the low pressure drop diode of zero ohm level, so as to reduce second diode
The pressure difference of the voltage of output end and the voltage of input.
Further, the power sense circuit includes partial pressure circuit of steady voltage and voltage comparator circuit；
Partial pressure circuit of steady voltage and voltage comparator circuit connection；
The partial pressure circuit of steady voltage is used for the input power and carries out voltage stabilizing and partial pressure, and the voltage comparator circuit is used for pair
The input voltage is detected, and the testing result is sent to the electronic equipment.
Further, the partial pressure circuit of steady voltage includes second resistance, voltage-regulator diode, 3rd resistor and the 4th resistance；
The second resistance carries out current-limiting protection to the voltage-regulator diode；
The voltage-regulator diode carries out voltage stabilizing to the input power；
The 3rd resistor and the 4th resistant series, partial pressure is carried out to the output voltage of the voltage-regulator diode.
Further, the voltage comparator circuit includes the peripheral circuit of voltage comparator and the voltage comparator；Institute
State voltage comparator to be compared the output voltage of the partial pressure circuit of steady voltage, and comparative result is exported to the electronics set
It is standby.
Further, in addition to input stabilizing circuit, the input stabilizing circuit is connected with the electricity storage circuit；Institute
Stating input stabilizing circuit is used to be filtered voltage stabilizing to the input power.
Further, the input stabilizing circuit includes the first electric capacity and the second electric capacity；
First electric capacity and the second electric capacity are connected in parallel, and first electric capacity and the second electric capacity are used for the input electricity
Source filtering voltage regulation, it is ensured that the stability of input supply voltage.
Further, in addition to output voltage stabilizing circuit, the output voltage stabilizing circuit is connected with the electricity storage circuit；
The output voltage stabilizing circuit is used to the out-put supply being filtered voltage stabilizing.
Further, the output voltage stabilizing circuit includes the 4th electric capacity, the 5th electric capacity, the 4th electric capacity, the 5th electric capacity
Parallel with one another, the 4th electric capacity, the 5th electric capacity are filtered voltage stabilizing for the out-put supply.
Compared with prior art, the beneficial effect of the embodiment of the present invention is：
The embodiment of the present invention realizes input power part power storage by the electricity storage circuit, and in input electricity
Automatic seamless switching is carried out after the power down of source；The power sense circuit realizes the detection of input supply voltage, and notifies just
In the electronic equipment of operation, the electronic equipment is set to carry out data cached preservation, it is to avoid because power-off causes in electronic equipment
Break and run and the loss of data of generation.
The electricity storage circuit carries out energy storage using the electric capacity of Large Copacity solid-state the 3rd, the power-down protection circuit is existed
Worked under the complex environments such as wide temperature, high humidity environment.
Brief description of the drawings
Fig. 1 is the power-down protection apparatus structural representation that the embodiment of the present invention one is provided；
Fig. 2 is the power detecting modular structure schematic diagram that the embodiment of the present invention one is provided；
Fig. 3 is electricity input Voltage stabilizing module, electricity memory module and the output Voltage stabilizing module electricity that the embodiment of the present invention two is provided
Line structure schematic diagram；
Fig. 4 is the power detecting modular circuit structural representation that the embodiment of the present invention two is provided.
Embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing
Give presently preferred embodiments of the present invention.But, the present invention can be realized in many different forms, however it is not limited to this paper institutes
The embodiment of description.On the contrary, the purpose for providing these embodiments is to make the understanding to the disclosure more thorough
Comprehensively.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention
The implication that technical staff is generally understood that is identical.Term used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Embodiment one：
Refering to Fig. 1, it is illustrated that be power-down protection apparatus structural representation provided in an embodiment of the present invention,
The power-down protection apparatus includes electricity memory module 10 and power detecting module 20；
The electricity memory module 10 is used to be stored the part electric energy in input power 30, and in the input electricity
During the power down of source, the storage electric energy of the electricity memory module 10 is exported to electronic equipment 40；
The state of the power detecting module 20 detection input power 30, and testing result is fed back into the electricity
Sub- equipment 40.
Further, the power-down protection apparatus also includes electricity input Voltage stabilizing module 50；
The input Voltage stabilizing module 50 is connected with the electricity memory module 10；The input Voltage stabilizing module 50 is used for institute
State input power 30 and be filtered voltage stabilizing.
Further, the power-down protection apparatus also includes output Voltage stabilizing module 60；
The output Voltage stabilizing module 60 is connected with the electricity input Voltage stabilizing module 50 and the electricity memory module 10 respectively；
The output Voltage stabilizing module 60 is used to be filtered voltage stabilizing to out-put supply.
Refering to Fig. 2, it is illustrated that be the structural representation of power detecting module 20 provided in an embodiment of the present invention.
The power detecting module 20 includes voltage stabilizing division module 21 and voltage comparison module 22；
The voltage stabilizing division module 21 is connected with the voltage comparison module 22；
The voltage stabilizing division module 21 is used to carry out voltage stabilizing and partial pressure, the voltage comparison module to the input power 30
22 are used to detect the input voltage, and the testing result is sent to the electronic equipment 40.
The part that the embodiment of the present invention realizes input power by the electricity memory module 10 is stored, and in input electricity
The storage electric energy of the electricity memory module 10 is exported to electronic equipment during the power down of source；The power detecting module 20 is realized
The detection of input supply voltage, and the electronic equipment that notice is currently running, make the electronic equipment carry out data cached preservation,
Avoid due to the loss of data that power-off causes electronic equipment to interrupt and produces.
Embodiment two：
Refering to Fig. 3, it is illustrated that be the input stabilizing circuit 500 provided in an embodiment of the present invention, the and of electricity storage circuit 100
The electrical block diagram of output voltage stabilizing circuit 600.
The power-down protection apparatus includes electricity storage circuit 100 and power sense circuit 200；
The electricity storage circuit 100 is used to be stored the part electric energy in input power VCCIN, and described defeated
When entering power supply VCCIN power down, the storage electric energy of the electricity storage circuit 100 is exported to electronic equipment (not shown)；
The power sense circuit 200 detection input power VCCIN state, and testing result is fed back into institute
State electronic equipment (not shown).
Further, the power-down protection apparatus also includes input stabilizing circuit 500；
The input stabilizing circuit 500 is connected with the electricity storage circuit 100；The input stabilizing circuit 500 is used for
Voltage stabilizing is filtered to the input power VCCIN.
Further, the power-down protection apparatus also includes output voltage stabilizing circuit 600.
The output voltage stabilizing circuit 600 is connected with the electricity storage circuit 100.The output voltage stabilizing circuit 600 is used for
Out-put supply VCCOUT is filtered voltage stabilizing.
Refering to Fig. 3, the input stabilizing circuit 500 includes the first electric capacity C1 and the second electric capacity EC1；
The first electric capacity C1 and the second electric capacity EC1 are parallel with one another；The input stabilizing circuit 500 is divided by connector J1
It is not connected with the input power VCCIN and reference ground GND.
The first electric capacity C1 and the second electric capacity EC1 is used for the filtering voltage regulation to the input power VCCIN, it is ensured that input
The stability of power supply VCCIN voltages.
Preferably, in the present invention is implemented, the second electric capacity EC1 uses solid-state storage electric capacity.
Refering to Fig. 3, the electricity storage circuit 100 include the first diode D1, first resistor R1, the 3rd electric capacity EC2 and
Second diode D2；
Preferably, in the present invention is implemented, the first diode D1 uses internal resistance for the low pressure drop two of zero ohm level
Pole pipe, so as to reduce the pressure difference of the voltage of the first diode D1 output ends and the voltage of input.
Preferably, in the present invention is implemented, the first resistor R1 uses high-power resistance.Occurrence can be according to described
Input power VCCIN magnitudes of voltage and the 3rd electric capacity EC2 capacitance are calculated and obtained.
Preferably, in embodiments of the present invention, the 3rd electric capacity EC2 quantity is no less than one, the multiple 3rd
Electric capacity EC2 is connected in parallel, so as to increase the amount of storage of capacitive electric energy.
Preferably, in the present invention is implemented, the 3rd electric capacity EC2 uses Large Copacity solid-state storage capacitor.Described
Three electric capacity EC2 are wide temperature mutual capacitance, and the 3rd electric capacity EC2 operating temperature ranges are -55 DEG C~125 DEG C.
Preferably, in the present invention is implemented, the capacitance of the 3rd electric capacity EC2 is between 470uf to 2500uf；
Other capacitances can be selected based on the actual application requirements.
Preferably, in the present invention is implemented, the second diode D2 uses internal resistance for the low pressure drop two of zero ohm level
Pole pipe, so as to reduce the pressure difference of the voltage of the second diode D2 output ends and the voltage of input.
The one end of described first diode D1 one end respectively with the first electric capacity C1 and the second electric capacity EC1 is connected, and first
The diode D1 other end is connected and out-put supply VCCOUT connections with described first resistor R1 one end respectively, the first resistor
The R1 other ends are connected with described 3rd electric capacity EC2 one end, the 3rd electric capacity EC2 other ends and described second diode D2 one end
Connection, the second diode D2 other ends are connected with the out-put supply VCCOUT；
In normal power supply, the input power VCCIN is through the first electric capacity C1 and the second electric capacity EC1 filtering voltage regulations
Afterwards, the out-put supply VCCOUT is exported through the first diode D1, to the electronic equipment (not shown) normal power supply.By
In the one-way conduction of the first diode D1, the input stabilizing circuit 500 and the electricity storage circuit 100 are realized
The one-way conduction that power supply is powered；
In addition, in the normal power supply of the input power VCCIN, a part of electric energy of the input power VCCIN is given
The electronic equipment (not shown) is powered, and another part electric energy is by the first resistor R1 to the 3rd electric capacity EC2
Charged；Realized by the 3rd electric capacity EC2 and the first resistor R1 electric energy inputted is stored；And pass through described first
Resistance R1 realizes the charging battery to the 3rd electric capacity EC2, reduces the capacity load of the 3rd electric capacity EC2 to described
The impact of input power VCCIN voltage, it is ensured that the voltage stability during electronic equipment (not shown) normal power supply, is realized
To the 3rd electric capacity EC2 trickle charge principle.
When the Voltage Drop of the input power VCCIN is to low value, the first diode D1 is unable to forward conduction, place
In nonconducting state, now the storage electric energy effect in the 3rd electric capacity EC2 is in the second diode D2, the described 2nd 2
Pole pipe D2 is turned on, and continues to power to the electronic equipment (not shown), so as to realize after the input power VCCIN power down
The automatic switchover of power supply, prevents the electronic equipment (not shown) because shutting down occurs in unexpected power down and causes to be stored in caching
Data are not preserved and lost and other failures in time.The input power is realized by the second diode D2
The out-put supply VCCOUT is switched into the 3rd electric capacity EC2 during VCCIN power down.
Due to the first diode D1 one-way conduction, prevent the accumulation power supply of the electricity storage circuit 100 from flowing to institute
State input stabilizing circuit 500, it is to avoid the counter of the electric energy of electricity storage circuit 100 is inculcated out, causes the loss of energy.
Repid discharge and input power VCCIN by the second diode D2 realizations to the 3rd electric capacity EC2 are fallen
The seamless automatic switchover of power supply after electricity.
Refering to Fig. 3, the output voltage stabilizing circuit 600 includes the 4th electric capacity C2, the 5th electric capacity EC3,
The 4th electric capacity C2, the 5th electric capacity EC3 are parallel with one another, and one end is connected with the out-put supply VCCOUT, another
End is connected with the reference ground GND.
The 4th electric capacity C2, the 5th electric capacity EC3 realize the filtering voltage regulation to the out-put supply VCCOUT, and output is stable
The out-put supply VCCOUT to the electronic equipment (not shown).
Optionally, in embodiments of the present invention, the 4th electric capacity C2, the 5th electric capacity EC3 can be increased according to actual conditions
Subtract, the 4th electric capacity C2, the 5th electric capacity EC3 capacitance can be selected according to actual conditions.
Refering to Fig. 4, it is illustrated that be the structural representation of power sense circuit 200 provided in an embodiment of the present invention.
The power sense circuit 200 includes partial pressure circuit of steady voltage 210 and voltage comparator circuit 220；
Partial pressure circuit of steady voltage 210 and voltage comparator circuit 220 are connected；
The partial pressure circuit of steady voltage 210 is used to carry out the input power VCCIN voltage stabilizing and partial pressure, the voltage ratio compared with
Circuit 220 is used to detect the input voltage, and the testing result is sent to the electronic equipment (not shown).
The partial pressure circuit of steady voltage 210 includes second resistance R2, voltage-regulator diode D3,3rd resistor R3 and the 4th resistance
R4；
Preferably, in embodiments of the present invention, the voltage of voltage regulation value of the voltage-regulator diode D3 is 9.1V.
Described second resistance R2 one end is connected with the input power VCCIN, the other end respectively with the voltage-regulator diode
D3 one end and the connection of 3rd resistor R3 one end；The other end of the voltage-regulator diode D3 is connected with the reference ground GND, and described
The three resistance R3 other ends are connected with one end of the 4th resistance R4, the 4th resistance R4 other ends and the reference ground GND
Connection.
When the input power VCCIN normal power supplies, the voltage-regulator diode D3 is carried out to the input power VCCIN
Voltage stabilizing, because the 3rd resistor R3 and the 4th resistance R4 is serially connected, the voltage-stabilized power supply of the voltage-regulator diode D3 outputs is led to
Cross after the 3rd resistor R3 and the 4th resistance R4 partial pressures is that the voltage comparator circuit 220 provides stable comparison voltage.
When the magnitude of voltage of the input power VCCIN is dropped into below the voltage stabilizing value of the voltage-regulator diode D3, now,
Because the 3rd resistor R3 and R4 connects, partial pressure is carried out to the output voltage of the voltage-regulator diode D3.By the described 3rd
Output voltage after resistance R3 and the 4th resistance R4 partial pressures is input to the input of voltage comparator circuit 220 through Zero-ohm resistor R14
End.The second resistance R2 carries out current-limiting protection to the voltage-regulator diode D3, prevents the voltage-regulator diode D3 because of excessively stream
Damage.
Refering to Fig. 4, the voltage comparator circuit 220 includes voltage comparator U1 and its peripheral circuit；
Preferably, in embodiments of the present invention, it is described when the comparator U1 input terminal voltages value is less than setting value,
The exporting change voltage of the voltage comparator U1 output ends is become by high level turns to low level.
Preferably, in embodiments of the present invention, the voltage comparator U1 uses SGM706 model comparators, described
The reference voltage of GM706 comparators is 1.25v, and the output voltage after 3rd resistor R3 and the 4th resistance R4 partial pressures is less than
During 1.25V, the output voltage of the voltage comparator U1 is converted to low level from high level.
Optionally, it would however also be possible to employ other model voltage comparators are compared to realize to input voltage.
The comparator U1 is compared to the output voltage of the partial pressure circuit of steady voltage 210, and comparative result is exported
To the electronic equipment (not shown).The voltage comparator U1 detects that the output voltage values of the partial pressure circuit of steady voltage 210 are
It is no to be less than setting value, if the output voltage values are less than the setting value, the voltage comparator U1 then exporting change level.
Refering to Fig. 3 and Fig. 4.The voltage comparator U1 detects input power VCCIN Voltage Drop to after setting value,
Just exporting change level voltage is to the electronic equipment.Now, the electronic equipment receives the voltage comparator output
After variation level signal, the input power electricity shortage or unexpected power down are just known, just in the electronic equipment
Program it is operating some data cached carry out urgent storage processing, it is to avoid due to the input power VCCIN power supply not
Foot shuts down and causes the loss of data.
At the same time, because the Voltage Drop of the input power VCCIN is to after setting value, first diode is in
Nonconducting state, the second diode D2 is turned in the presence of the storage electric energy of the 3rd electric capacity EC2.Power supply state by
Input power VCCIN automatically switches to the 3rd electric capacity EC2, continues to the electronic equipment out-put supply VCCOUT.
Further, the electronic equipment is received after the exporting change level of the voltage comparator U1, passes through the electricity
Connector (not shown) in sub- equipment sends the voltage status of the input power to other electronic equipments.
The embodiment of the present invention is set by circuit and realizes power-down protection apparatus described in embodiment one,
The electricity storage circuit 100 carries out energy storage using the 3rd electric capacity EC2 of Large Copacity solid-state energy storage, makes the power down
Protection circuit can work under the complex environments such as wide temperature, high humidity environment.
The electricity storage circuit 100 realizes the charging battery to the 3rd electric capacity EC2 using first resistor R1, reduces
Impact of the capacitive load of the 3rd electric capacity EC2 to input power VCCIN, it is ensured that the normal upper electricity of electronic product；And lead to
Cross put the second diode D2 realize the fast electric discharge to the 3rd electric capacity EC2 and electronic product equipment power supply source without seaming and cutting
Change.
Above-described embodiment is preferably embodiment, but embodiments of the present invention are not by above-described embodiment of the invention
Limitation, other any Spirit Essences without departing from the present invention and the change made under principle, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (10)
1. a kind of power-down protection circuit, it is characterised in that including：
Electricity storage circuit and power sense circuit；
The electricity storage circuit is used to be stored the part electric energy in input power, and in the input power power down
When, the storage electric energy of the electricity storage circuit is exported to electronic equipment；
The state of the power sense circuit detection input power, and testing result is fed back into the electronic equipment.
2. power-down protection circuit according to claim 1, it is characterised in that the electricity storage circuit includes the one or two pole
Pipe, first resistor, the 3rd electric capacity and the second diode；
One end of first diode is connected with described first resistor one end and out-put supply respectively, and the first resistor is another
End is connected with described 3rd electric capacity one end, and the 3rd electric capacity other end is connected with described second diode one end, and described second
The diode other end is connected with the out-put supply；
First diode is used for the electricity storage circuit and the one-way conduction of the input power, prevents the electricity from depositing
The accumulation power supply on storing up electricity road flows to the input power；
The first resistor is used for the charging battery of the 3rd electric capacity, so as to reduce the capacity load pair of the 3rd electric capacity
The impact of the input supply voltage；
3rd electric capacity is used for the storage of the electric energy inputted to the first resistor；
Second diode is used to out-put supply is switched into the 3rd electric capacity during input power power down.
3. power-down protection circuit according to claim 2, it is characterised in that first diode uses internal resistance for zero Europe
The low pressure drop diode of nurse level, so as to reduce the pressure difference of the voltage of first diode output and the voltage of input；
The first resistor uses high-power resistance；
3rd electric capacity uses Large Copacity solid-state storage capacitor, and the 3rd electric capacity quantity is no less than one, the multiple the
Three electric capacity are connected in parallel, so as to increase the power storage amount of electric capacity；
Second diode uses internal resistance for the low pressure drop diode of zero ohm level, so as to reduce the second diode output
The voltage at end and the pressure difference of input terminal voltage.
4. power-down protection circuit according to claim 1, it is characterised in that the power sense circuit includes voltage stabilizing partial pressure
Circuit and voltage comparator circuit；
Partial pressure circuit of steady voltage and voltage comparator circuit connection；
The partial pressure circuit of steady voltage carries out voltage stabilizing and partial pressure to the input power, and the voltage comparator circuit is used for described defeated
Enter voltage to be detected, and testing result is sent to the electronic equipment.
5. power-down protection circuit according to claim 4, it is characterised in that the partial pressure circuit of steady voltage includes the second electricity
Resistance, voltage-regulator diode, 3rd resistor and the 4th resistance；
The second resistance carries out current-limiting protection to the voltage-regulator diode；
The voltage-regulator diode carries out voltage stabilizing to the input power；
The 3rd resistor and the 4th resistant series, partial pressure is carried out to the output voltage of the voltage-regulator diode.
6. power-down protection circuit according to claim 4, it is characterised in that the voltage comparator circuit include voltage ratio compared with
The peripheral circuit of device and the voltage comparator；The voltage comparator is compared to the output voltage of partial pressure circuit of steady voltage,
And export comparative result to the electronic equipment.
7. power-down protection circuit according to claim 1, it is characterised in that also including input stabilizing circuit, the input
Mu balanced circuit is connected with the electricity storage circuit；The input stabilizing circuit is used to be filtered surely the input power
Pressure.
8. power-down protection circuit according to claim 7, it is characterised in that the input stabilizing circuit includes the first electric capacity
With the second electric capacity；
First electric capacity and the second electric capacity are parallel with one another, and first electric capacity and the second electric capacity are used to filter the input power
Ripple voltage stabilizing, it is ensured that the stability of input supply voltage.
9. power-down protection circuit according to claim 1, it is characterised in that also including output voltage stabilizing circuit, the output
Mu balanced circuit is connected with the electricity storage circuit；
The output voltage stabilizing circuit is used to the out-put supply being filtered voltage stabilizing.
10. power-down protection circuit according to claim 9, it is characterised in that the output voltage stabilizing circuit includes the 4th electricity
Appearance, the 5th electric capacity, the 4th electric capacity, the 5th electric capacity are connected in parallel, and the 4th electric capacity, the 5th electric capacity are used for the output electricity
Source is filtered voltage stabilizing.
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| CN201710252709.4A CN107046323A (en) | 2017-04-18 | 2017-04-18 | A kind of power-down protection circuit |
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| CN201710252709.4A CN107046323A (en) | 2017-04-18 | 2017-04-18 | A kind of power-down protection circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106855695A (en) * | 2016-12-30 | 2017-06-16 | 上海新时达电气股份有限公司 | Robot security's control system and method |
| CN107561457A (en) * | 2017-08-30 | 2018-01-09 | 陕西千山航空电子有限责任公司 | A kind of built-in independent current source status monitoring circuit |
| CN109907378A (en) * | 2019-04-08 | 2019-06-21 | 深圳市海派特光伏科技有限公司 | Electronic cigarette power circuit and electronic cigarette |
| CN110071566A (en) * | 2019-04-04 | 2019-07-30 | 四川海天仪表电器开发有限公司 | Power down delay circuit |
| CN111026224A (en) * | 2019-12-19 | 2020-04-17 | 广州金升阳科技有限公司 | Auxiliary circuit |
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| CN102157979A (en) * | 2011-02-28 | 2011-08-17 | 华为技术有限公司 | Power-down retaining method and circuit |
| CN102355046A (en) * | 2011-09-09 | 2012-02-15 | Tcl新技术（惠州）有限公司 | Voltage detection and power failure protection device and implementation method |
| WO2017016012A1 (en) * | 2015-07-27 | 2017-02-02 | 深圳市华星光电技术有限公司 | Protective circuit |
| CN206790191U (en) * | 2017-04-18 | 2017-12-22 | 深圳市菲菱科思通信技术股份有限公司 | A kind of power-down protection circuit |
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| CN102157979A (en) * | 2011-02-28 | 2011-08-17 | 华为技术有限公司 | Power-down retaining method and circuit |
| CN102355046A (en) * | 2011-09-09 | 2012-02-15 | Tcl新技术（惠州）有限公司 | Voltage detection and power failure protection device and implementation method |
| WO2017016012A1 (en) * | 2015-07-27 | 2017-02-02 | 深圳市华星光电技术有限公司 | Protective circuit |
| CN206790191U (en) * | 2017-04-18 | 2017-12-22 | 深圳市菲菱科思通信技术股份有限公司 | A kind of power-down protection circuit |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106855695A (en) * | 2016-12-30 | 2017-06-16 | 上海新时达电气股份有限公司 | Robot security's control system and method |
| CN107561457A (en) * | 2017-08-30 | 2018-01-09 | 陕西千山航空电子有限责任公司 | A kind of built-in independent current source status monitoring circuit |
| CN110071566A (en) * | 2019-04-04 | 2019-07-30 | 四川海天仪表电器开发有限公司 | Power down delay circuit |
| CN109907378A (en) * | 2019-04-08 | 2019-06-21 | 深圳市海派特光伏科技有限公司 | Electronic cigarette power circuit and electronic cigarette |
| CN109907378B (en) * | 2019-04-08 | 2024-05-14 | 深圳市海派特光伏科技有限公司 | Electronic cigarette power supply circuit and electronic cigarette |
| CN111026224A (en) * | 2019-12-19 | 2020-04-17 | 广州金升阳科技有限公司 | Auxiliary circuit |
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