CN108336786B - Load-proof power supply oscillation circuit for Farad capacitor backup power supply - Google Patents
Load-proof power supply oscillation circuit for Farad capacitor backup power supply Download PDFInfo
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- CN108336786B CN108336786B CN201810145536.0A CN201810145536A CN108336786B CN 108336786 B CN108336786 B CN 108336786B CN 201810145536 A CN201810145536 A CN 201810145536A CN 108336786 B CN108336786 B CN 108336786B
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- power supply
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- 239000003990 capacitor Substances 0.000 title claims abstract description 52
- 230000010355 oscillation Effects 0.000 title claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 238000007599 discharging Methods 0.000 claims abstract description 10
- 238000010586 diagram Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 229910003307 Ni-Cd Inorganic materials 0.000 description 1
- 229910018095 Ni-MH Inorganic materials 0.000 description 1
- 229910018477 Ni—MH Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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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
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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
Abstract
The invention discloses a load-proof power supply oscillation circuit for a farad capacitor backup power supply. The invention relates to an anti-load power supply oscillation circuit for a farad capacitor backup power supply, which comprises an anti-oscillation control circuit, a power failure detection circuit and a charging and discharging circuit; the power failure detection circuit is connected with the charge and discharge circuit, and the charge and discharge circuit is connected with the anti-oscillation control circuit; the anti-oscillation control circuit is used for being connected with a load power supply. The load power supply oscillation preventing circuit for the farad capacitor backup power supply effectively prevents the repeated oscillation of the load power supply circuit when the farad capacitor is used as the backup power supply, and prolongs the service life of the load power supply.
Description
Technical Field
The invention relates to the field of power supplies, in particular to a load-proof power supply oscillation circuit for a farad capacitor backup power supply.
Background
Along with the improvement of the production process of the farad capacitor, the service life is greatly prolonged, the charging and discharging times of the farad capacitor are more than 50 ten thousand times, 500 times of that of a Li-lon battery and 1000 times of that of a Ni-MH battery and a Ni-Cd battery, the farad capacitor can be charged by large current, the charging and discharging time period is simple in circuit requirement, no memory effect exists, and the farad capacitor is more and more widely applied as a backup power supply.
In the prior art, a farad capacitor is used as a backup source, the farad capacitor is directly charged and discharged for a load power supply, when the farad capacitor is powered down to the lowest working voltage of a load power supply circuit, the load power supply stops working, due to the fact that the internal resistance of the farad capacitor is large, the voltage of the farad capacitor rises above the lowest working voltage of the load power supply circuit, the load power supply circuit works again, and the farad capacitor and the load power supply circuit are repeatedly and easily oscillated.
Because the load power circuit oscillates repeatedly, if the load power circuit has MCU or memory, it will automatically restart and repeatedly erase, which will affect the service life.
Disclosure of Invention
According to the load-proof power supply oscillation circuit for the Farad capacitor backup power supply, the anti-oscillation control circuit is added into the Farad capacitor backup power supply, so that the problem that oscillation is generated when the Farad capacitor is used as the backup power supply to influence a post-stage circuit is well solved.
The technical scheme adopted by the invention is as follows: a load-proof power supply oscillation circuit for a farad capacitor backup power supply comprises an oscillation-proof control circuit, a power failure detection circuit and a charging and discharging circuit; the power failure detection circuit is connected with the charge and discharge circuit, and the charge and discharge circuit is connected with the anti-oscillation control circuit; the anti-oscillation control circuit is used for being connected with a load power supply.
Preferably, the anti-oscillation control circuit further includes a first diode, a filter capacitor, a first triode, a second triode, a first voltage-dividing resistor, a second voltage-dividing resistor, a third voltage-dividing resistor, a fourth voltage-dividing resistor, a fifth voltage-dividing resistor, a sixth current-limiting resistor, a seventh pull-up resistor, an eighth current-limiting resistor, and a ninth current-limiting resistor; the third voltage-dividing resistor is connected with the emitting electrode of the first triode, the sixth current-limiting resistor is connected with the base electrode of the first triode, the other end of the sixth current-limiting resistor is connected with the collecting electrode of the second triode, the ninth current-limiting resistor is also connected with the collecting electrode of the second triode, the other end of the ninth current-limiting resistor is grounded, the eighth current-limiting resistor is connected with the base electrode of the second triode, the seventh pull-up resistor is connected with the emitting electrode of the second triode, the other end of the seventh current-limiting resistor is connected with the anode of the first diode, the cathode of the first diode is respectively connected with the fifth voltage-dividing resistor and the other end of the fifth voltage-dividing resistor is grounded.
Preferably, the power failure detection circuit comprises a third triode, an eleventh current limiting resistor, a twelfth divider resistor and a thirteenth divider resistor; the base electrode of the third triode is connected with an eleventh current limiting resistor, the collector electrode of the third triode is connected with a twelfth divider resistor, the twelfth divider resistor is connected with a thirteenth divider resistor in series, and the other end of the thirteenth divider resistor is grounded.
Preferably, the charge and discharge circuit comprises a second schottky diode, a third schottky diode, a fourth schottky diode, a tenth current limiting resistor and a farad capacitor; the negative electrode of the third Schottky diode is connected with a tenth current-limiting resistor, the other end of the tenth current-limiting resistor is connected with the positive electrode of the fourth Schottky diode, the farad capacitor is connected with the positive electrode of the fourth Schottky diode, and the other end of the farad capacitor is grounded.
Preferably, the first triode, the second triode and the third triode are all NPN triodes.
The invention has the beneficial effects that:
the load power supply oscillation preventing circuit for the farad capacitor backup power supply effectively prevents the repeated oscillation of the load power supply circuit when the farad capacitor is used as the backup power supply, and prolongs the service life of the load power supply.
Drawings
The following further describes embodiments of the present invention with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of a farad capacitor charging and discharging system of the present invention;
figure 2 is a schematic diagram of an anti-load power supply oscillation circuit for a farad capacitor backup power supply of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Figure 1 is a schematic diagram of a farad capacitor charging and discharging system of the present invention, including a power down detection circuit, a charging and discharging circuit, a load power circuit, an anti-oscillation control circuit, and an MCU module.
In the prior art, a farad capacitor is used for directly charging and discharging a load power supply, and when the farad capacitor is powered down to the lowest working voltage of a load power supply circuit, the load power supply stops working. Because the internal resistance of the farad capacitor is large, the voltage of the farad capacitor rises above the lowest working voltage of the load power circuit, and the load power circuit works again, so that the load power circuit is easy to oscillate repeatedly.
The invention aims to solve the problem that a load power supply generates oscillation when a farad capacitor is used as a backup power supply. Referring to fig. 2, the invention provides a load-proof power supply oscillation circuit for a farad capacitor backup power supply, which is provided with a power failure detection circuit, a charge and discharge circuit and an oscillation-proof control circuit.
In this embodiment, as shown in fig. 2, the chip U1 includes a power down detection signal input terminal VDROP _ MON and a control enable signal output terminal VDD _ EN, where the power down detection signal input terminal VDROP _ MON is connected to the power down detection circuit, and the control enable signal output terminal VDD _ EN is connected to the load circuit. The power failure detection circuit is connected with the charge and discharge circuit, and the charge and discharge circuit is connected with the anti-oscillation control circuit.
In this embodiment, as shown in fig. 2, the oscillation preventing control circuit further includes a first diode D1, a capacitor C1, a first triode Q1, a second triode Q2, a first voltage-dividing resistor R1, a second voltage-dividing resistor R2, a third voltage-dividing resistor R3, a fourth voltage-dividing resistor R4, a fifth voltage-dividing resistor R5, a sixth current-limiting resistor R6, a seventh pull-up resistor R7, an eighth current-limiting resistor R8, and a ninth current-limiting resistor R9. The first diode D1 is used to reduce the conduction voltage drop of the second diode Q2 when the voltage is above 4V and the chip U2 stops working.
In this embodiment, as shown in fig. 2, the power down detection circuit includes a third transistor Q3, an eleventh current limiting resistor R11, a twelfth voltage dividing resistor R12, and a thirteenth voltage dividing resistor R13.
In this embodiment, as shown in fig. 2, the charging and discharging circuit includes a second schottky diode D2, a third schottky diode D3, a fourth schottky diode D4, a tenth current limiting resistor R10, and a pull-up capacitor C2. The second schottky diode D2, the third schottky diode D3, and the fourth schottky diode D4 utilize the unidirectional conduction characteristic of the diodes to prevent the voltage of the farad capacitor C2 from flowing back to the +5V after the power is off.
Where +5V _ Core is used to supply the load power circuit and 3V3 is the voltage generated by the load power circuit.
Working principle of the chip U1: the comparison voltage of the VCC signal end is 2.2V, and when the voltage of the VDET signal end is larger than 2.2V, the OUT signal end outputs high level; when the voltage of the VDET signal is less than 2.2V, the OUT signal outputs low level.
The working principle of the embodiment is as follows:
when +5V is powered on, the farad capacitor C2 is charged; when the +5V is powered off and the +5V is lower than 4V, the power failure detection signal input end VDROP _ MON carries out power failure detection, and the chip U3 carries out data storage. The specific working process of the whole power failure detection circuit is as follows: when the power is not cut off, the voltage of 5V-3.3V is 1.7V which is more than 0.7V, according to the working principle of the PNP triode, the voltage of 1.7V is more than the conduction voltage drop of the PNP triode, the third triode Q3 is conducted, R12 and R13 divide the voltage of +5V,
after power is off, when the +5V drops to be smaller than 4V, the triode is turned off, the third triode Q3 is not conducted, the VDROP _ MON is 0V, and the U3MCU conducts power-down detection and stores data.
In the faraday-capacitor oscillation-preventing control circuit, when the faraday-capacitor C2 discharges, VDET is +5V _ Core (R2+ R3)/(R1+ R2+ R3), and the VDET signal terminal decreases as +5V _ Core decreases.
When the VDET is reduced to a voltage comparison point of the chip U1PJ7022, the signal output end OUT of the U1 outputs low level, namely the enable signal output end VDD _ EN is controlled to be low level, and the output of the load power supply U2 is turned off; the load is reduced, the voltage of the farad capacitor C2 rises, but the control enable signal output end VDD _ EN is low level, the second triode Q2 and the third triode Q3 are conducted, the eleventh current limiting resistor R11 is short-circuited, at this time, VDET is +5V _ Core R2/(R1+ R2), and the VDET increases along with the increase of +5V _ Core, but the control enable signal output end VDD _ EN is always low level, and the load power supply cannot work again, so that the effect of preventing oscillation is achieved, because the VDET does not reach the PJ7022 voltage comparison point of the chip U1 when the +5V _ Core increases to the maximum value.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. A load-proof power supply oscillation circuit for a farad capacitor backup power supply is characterized by comprising an oscillation-proof control circuit, a power failure detection circuit and a charging and discharging circuit;
the power failure detection circuit is connected with the charge and discharge circuit, and the charge and discharge circuit is connected with the anti-oscillation control circuit;
the anti-oscillation control circuit is used for connecting a load power supply;
the anti-oscillation control circuit further comprises a chip U1, a first signal input end of the chip U1 is respectively connected with a set power supply VDET, one end of a first voltage-dividing resistor and one end of a filter capacitor, a second signal input end of the chip U1 and the other end of the filter capacitor are respectively grounded, a signal output end of the chip U1 is connected with a cathode of a first diode, the other end of the first voltage-dividing resistor is connected with the charge-discharge circuit, and the set power supply VDET is grounded after passing through the second voltage-dividing resistor and a third voltage-dividing resistor which are sequentially connected in series; the anti-oscillation control circuit further comprises a first diode, a filter capacitor, a first triode, a second triode, a first voltage dividing resistor, a second voltage dividing resistor, a third voltage dividing resistor, a fourth voltage dividing resistor, a fifth voltage dividing resistor, a sixth current limiting resistor, a seventh pull-up resistor, an eighth current limiting resistor and a ninth current limiting resistor;
the third voltage-dividing resistor is connected between an emitting electrode and a collecting electrode of the first triode, one end of the sixth current-limiting resistor is connected with a base electrode of the first triode, the other end of the sixth current-limiting resistor is connected with a collecting electrode of the second triode, one end of the ninth current-limiting resistor is also connected with a collecting electrode of the second triode, the other end of the ninth current-limiting resistor is grounded, the eighth current-limiting resistor is connected with a base electrode of the second triode, one end of the seventh pull-up resistor is connected with an emitting electrode of the second triode, the other end of the seventh pull-up resistor is connected with an anode of the first diode, a cathode of the first diode is connected with one end of the fifth voltage-dividing resistor, and the other end of the fifth voltage-dividing resistor is grounded.
2. The load-rejection power supply oscillation circuit for a farad capacitor backup power supply of claim 1 wherein said power-down detection circuit comprises a third transistor, an eleventh current-limiting resistor, a twelfth voltage-dividing resistor, and a thirteenth voltage-dividing resistor;
the base electrode of the third triode is connected with an eleventh current limiting resistor, the collector electrode of the third triode is connected with one end of a twelfth divider resistor, the other end of the twelfth divider resistor is connected with a thirteenth divider resistor in series and then is grounded, and the emitting electrode of the third triode is connected with a 5V power supply end.
3. The anti-load power supply oscillation circuit for the farad capacitor backup power supply according to claim 1, wherein the charge and discharge circuit comprises a second schottky diode, a third schottky diode, a fourth schottky diode, a tenth current limiting resistor and a farad capacitor;
the negative electrode of the third Schottky diode is connected with one end of a tenth current-limiting resistor, the positive electrode of the third Schottky diode is connected with a 5V power supply end, the other end of the tenth current-limiting resistor is connected with the positive electrode of a fourth Schottky diode, the negative electrode of the fourth Schottky diode is connected with the 5V power supply end, one end of the farad capacitor is connected with the positive electrode of the fourth Schottky diode, and the other end of the farad capacitor is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810145536.0A CN108336786B (en) | 2018-02-11 | 2018-02-11 | Load-proof power supply oscillation circuit for Farad capacitor backup power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810145536.0A CN108336786B (en) | 2018-02-11 | 2018-02-11 | Load-proof power supply oscillation circuit for Farad capacitor backup power supply |
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| Publication Number | Publication Date |
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| CN108336786A CN108336786A (en) | 2018-07-27 |
| CN108336786B true CN108336786B (en) | 2020-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810145536.0A Active CN108336786B (en) | 2018-02-11 | 2018-02-11 | Load-proof power supply oscillation circuit for Farad capacitor backup power supply |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201230199Y (en) * | 2008-07-15 | 2009-04-29 | 北京市研祥兴业国际智能科技有限公司 | Power-down protection circuit |
| CN201887502U (en) * | 2010-11-23 | 2011-06-29 | 成都唐古拉科技有限公司 | Solar power device with overcharging protection circuit |
| US9379577B2 (en) * | 2012-08-30 | 2016-06-28 | Honeywell International Inc. | Capacitive power system having a service life extending approach |
| CN203069654U (en) * | 2012-12-30 | 2013-07-17 | 深圳市显控自动化技术有限公司 | Power failure detection circuit |
| CN205004821U (en) * | 2015-10-14 | 2016-01-27 | 广州御新软件有限公司 | Backup power supply system |
| CN206922483U (en) * | 2017-07-14 | 2018-01-23 | 河南卓正电子科技有限公司 | A kind of intelligent meter super capacitor power supply circuit |
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2018
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| CN108336786A (en) | 2018-07-27 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: An Anti load Power Supply Oscillation Circuit for Farad Capacitor Backup Power Supply Granted publication date: 20200512 Pledgee: Shenzhen Rural Commercial Bank Co.,Ltd. Shenzhen Shantou Special Cooperation Zone Branch Pledgor: SHENZHEN SAMKOON TECHNOLOGY Corp.,Ltd. Registration number: Y2024980009185 |
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