CN110535351A - DC power supply reliability of service life promotes circuit - Google Patents
DC power supply reliability of service life promotes circuit Download PDFInfo
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- CN110535351A CN110535351A CN201910870338.5A CN201910870338A CN110535351A CN 110535351 A CN110535351 A CN 110535351A CN 201910870338 A CN201910870338 A CN 201910870338A CN 110535351 A CN110535351 A CN 110535351A
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- 239000003990 capacitor Substances 0.000 claims abstract description 78
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 230000005611 electricity Effects 0.000 claims description 10
- 230000010355 oscillation Effects 0.000 claims description 3
- 230000032683 aging Effects 0.000 abstract description 19
- 230000000694 effects Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000002427 irreversible effect Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000011897 real-time detection Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention relates to the technical fields of DC power supply more particularly to a kind of DC power supply reliability of service life to promote circuit.The both ends capacitor C1 of the direct-current switch power supply power conversion loop input of DC supply input or the both ends capacitor C4 of output end are connected in parallel the stand-by circuit being made of varistor Ra, temperature switch K and electrolytic capacitor Ca；The both ends of the capacitor C4 of the direct-current switch power supply power conversion loop output are connected in parallel by the circuit of resonant inductance Lb, light emitting diode VDb and resonant capacitance the Cb detectable ripple voltage formed.The service life of existing DC power supply product can not only be substantially improved; can also there be the power supply of aging sign in first time discovery; by aging, still unspoiled power supply media board is rejected early; the operational reliability that the important equipments such as Electric control protection equipment can be effectively improved, reduces accident probability caused by unit exception.
Description
Technical field
The present invention relates to a kind of DC circuits more particularly to a kind of DC power supply reliability of service life to promote circuit.
Background technique
Direct-current switch power supply is using very extensive, and in power industry, direct-current switch power supply almost occupies all controls
The power module share of equipment is protected, however Switching Power Supply is limited to the technological problems of internal capacitor, usually slowly aging, has
When can bring larger hidden danger to the operation of second power equipment, according to incompletely statistics, many Substation controls protection systems lack
Sunken or accident, both from the powerup issue of internal electric source, this problem is especially pronounced in converter station, and DC power supply board is different
The accident for often resulting in direct current transportation locking repeatedly occurs, and switch power module has body compared with conventional linear regulated power supply
The advantages of product small, high-efficient, at low cost, high degree of automation, therefore largely used in industrial control field.However Switching Power Supply
Also have the shortcomings that obvious, be exactly that aging speed is fast, hidden danger may be carried out to the equipment belt of power supply.
Switching Power Supply adjusted by internal switch pipe nonstop switch, using PWM copped wave principle, voltage of transformation, switch frequency
Rate, which will reach 30KHz or more, can just lesser volume and higher efficiency.So high switching frequency is just to the filter of output end
Wave capacitor proposes high requirement, and since common polarity free capacitor capacity is small, the filter capacitor of output end must be using electricity
Capacitor is solved, electrolytic capacitor high-frequency loss is very big, can generate heat under high-frequency current effect so that aging is withered, however electrolytic capacitor is again
It does not damage suddenly, but gradually aging, which results in the ripples that the filter effect of power module can be reduced year by year, be exported
It can increase year by year.It is very high to control requirement of the protection board to power supply, slightly fluctuation will lead to program error and run winged, power module
Ripple when increasing to certain amplitude, the operation of board will necessarily be generated and be significantly affected, with the unstability of output voltage, line
Wave, internal resistance, the increase of alternating component, it is easy to lead to catastrophic failure or the crash of related board, or even accidentally hair tripping locking refers to
It enables, however the prior art is either offline or online, the technology all not detected to power module output ripple makes out
It is undecided always to close hidden danger caused by power source aging.
Summary of the invention
Present invention seek to address that drawbacks described above, provides a kind of DC power supply reliability of service life promotion circuit.
In order to overcome defect present in background technique, the technical solution adopted by the present invention to solve the technical problems is:
This DC power supply reliability of service life promotes the DC supply input that circuit includes DC circuit, and DC supply input includes
Direct-current switch power supply power conversion circuit, direct-current switch power supply power conversion circuit front end connection resistance wire FU, inductance L1,
BR, capacitor C1, direct-current switch power supply power conversion circuit include resistance R1, resistance R2, capacitor C7, resistance R3, diode VD1,
Integrated circuit IC 1, capacitor C5, resistance R5, capacitor C8, capacitor C9, capacitor C6, capacitor C2, capacitor C3, resistance R7, diode
VD2, diode VD3, Integrated circuit IC 2, resistance R4, resistance R6, inductance L2, capacitor C4 and diode VDZ composition, feature exist
In: the both ends capacitor C1 of the direct-current switch power supply power conversion loop input or the capacitor C4 both ends parallel connection of output end connect
Connect the stand-by circuit being made of varistor Ra, temperature switch K and electrolytic capacitor Ca；The direct-current switch power supply power conversion returns
The both ends of the capacitor C4 of road output end be connected in parallel by resonant inductance Lb, light emitting diode VDb and resonant capacitance Cb form can
Detect the circuit of ripple voltage.
It according to another embodiment of the invention, further comprise the stand-by circuit include that varistor Ra is opened with temperature
It is in parallel to close K, then connects with the electrolytic capacitor Ca.
It according to another embodiment of the invention, further comprise that the varistor Ra and temperature switch K are encapsulated as one
Body structure.
According to another embodiment of the invention, the circuit for further comprising the detectable ripple voltage includes resonance electricity
It is in parallel with light emitting diode VDb to feel Lb, then connects with the resonant capacitance Cb.
It according to another embodiment of the invention, further comprise that the resonant inductance Lb and resonant capacitance Cb are tuned in institute
State 80-the 120% of DC power supply switch pipe oscillation frequency.
The beneficial effects of the present invention are:
1, it by the electrolytic capacitor redundancy technique of proposition, by " backup " of electrolytic capacitor, is just realized with simple dexterously method
The service life of power insert maximum service life bottleneck --- electrolytic capacitor doubles, so as to make power supply device service life to very
Effective to be promoted, the prior art needs the service life of lifting switch power supply at double, needs at least to spend 3 times of complete machine of cost, will be electric
Solution capacitor replaces with solid capacitor or ceramic condenser and just can be achieved, and the present invention only needs to increase the electrolysis electricity an of normal backup
Hold, varistor is very cheap with temperature switch cost, therefore it is only necessary to increase the cost less than 15%, energy by the present invention
The same multiplication for realizing power source life；
2, the out-of-limit monitoring of ripple is realized by the LC resonance scheme of proposition, integrated circuit only needs three passive devices, at
This detects instrument far below off-line type ripple of the prior art, and does not need manpower periodic detection, in addition it simple small and exquisite is mentioned
At, can almost be installed additional inside any power module, realize power source aging degree real-time monitoring；
3, the service life of existing DC power supply product can not only be substantially improved, can also have the electricity of aging sign in first time discovery
Source, by aging, still unspoiled power supply media board is rejected early, can effectively improve the important equipments such as Electric control protection equipment
Operational reliability reduces accident probability caused by unit exception.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is the structural schematic diagram of another embodiment.
Specific embodiment
As shown in Figure 1, this DC power supply reliability of service life promotes the DC supply input that circuit includes DC circuit,
DC supply input includes direct-current switch power supply power conversion circuit, the front end connection in direct-current switch power supply power conversion circuit
Resistance wire FU, inductance L1, rectification BR, capacitor C1, direct-current switch power supply power conversion circuit includes resistance R1, resistance R2, capacitor
C7, resistance R3, diode VD1, Integrated circuit IC 1, capacitor C5, resistance R5, capacitor C8, capacitor C9, capacitor C6, capacitor C2, electricity
Hold C3, resistance R7, diode VD2, diode VD3, Integrated circuit IC 2, resistance R4, resistance R6, inductance L2, capacitor C4 and two poles
Pipe VDZ composition.
The both ends capacitor C1 of direct-current switch power supply power conversion loop input or the both ends capacitor C4 of output end are in parallel
Connect the stand-by circuit being made of varistor Ra, temperature switch K and electrolytic capacitor Ca；The direct-current switch power supply power conversion
The both ends of the capacitor C4 of loop output, which are connected in parallel, to be made of resonant inductance Lb, light emitting diode VDb and resonant capacitance Cb
The circuit of detectable ripple voltage.
Preference
Varistor Ra and temperature switch K being packaged as a whole structure.
Preference
Resonant inductance Lb and resonant capacitance Cb are tuned in 80-the 120% of the DC power supply switch pipe oscillation frequency.
Embodiment 1
As shown in Figure 1, the both ends capacitor C1 in direct-current switch power supply power conversion loop input are connected in parallel by resonant inductance
The circuit of the detectable ripple voltage of Lb, light emitting diode VDb and resonant capacitance Cb composition, direct-current switch power supply power conversion return
The both ends of the capacitor C4 of road output end be connected in parallel by resonant inductance Lb, light emitting diode VDb and resonant capacitance Cb form can
Detect the circuit of ripple voltage, the specific structure of the circuit of detectable ripple voltage be include resonant inductance Lb and light emitting diode
VDb is in parallel, then connects with the resonant capacitance Cb.Even if outside has installed the electrolytic capacitor of backup additional, electrolytic capacitor aging becomes
Gesture is still irreversible, it is therefore desirable to have the scheme of a detection ripple voltage, the output ripple of real-time detection power module is big
It is small, it could fundamentally prevent hidden danger caused by power issue.
Embodiment 2
As shown in Fig. 2, the both ends capacitor C4 in direct-current switch power supply power conversion loop output are connected in parallel by resonant inductance
The circuit of the detectable ripple voltage of Lb, light emitting diode VDb and resonant capacitance Cb composition, while line detectable all the way also in parallel
The circuit of wave voltage, the specific structure of the circuit of detectable ripple voltage be include resonant inductance Lb and light emitting diode VDb simultaneously
Connection, then connect with the resonant capacitance Cb.Even if outside has installed the electrolytic capacitor of backup additional, the trend of electrolytic capacitor aging is still
It is irreversible, it is therefore desirable to have the scheme of a detection ripple voltage, the output ripple size of real-time detection power module, ability
Fundamentally prevent hidden danger caused by power issue.
The originally a succession of pulse voltage with certain duty ratio of DC voltage of Switching Power Supply output, only passes through
The DC voltage that can just become smooth after the flat wave of the filter capacitor of output end is used for load.After capacitor aging, medium damage
Consumption angle can be substantially increased, and be declined to enable by the ability of high order AC compounent, and capacitance can also reduce, to enable electric discharge speed
Degree is speeded, and the present invention uses the principle of electrolytic capacitor backup, overcomes the problems, such as that electrolytic capacitor is easy to aging.Concrete principle is to back up
Electrolytic capacitor and original main capacitance circuit on, pass through shunt circuit and the master of a varistor and resistance and temperature switch
Capacitor is in parallel, temperature switch and varistor integrative packaging, when main capacitance filter effect is normal, ripple electricity on DC bus
Press lower, varistor is not turned on, and after main capacitance filter effect reduces, DC bus ripple is gradually increased, when ripple peak value
After varistor threshold voltage, varistor conducting, idle capacity begins with high frequency ripple current and flows through, due to pressure-sensitive electricity
Resistance conducting is regretted sharply generating heat, and after temperature rises to certain value, temperature switch is heated, and junction closure, spare electrolytic capacitor is connect
Entry loop plays filter action, realizes the backup effect of electrolytic capacitor, since electrolytic capacitor capacity is larger, when idle capacity passes through
When mechanical temperature switch accesses circuit, circuit connection moment has greater impact electric current, this electric current can be in temperature switch K contact
On play " spot welding " effect, temperature switch contact is permanently closed, being fully connected of spare electrolytic capacitor is realized, replaces aging electric
The effect of appearance.
If the direct voltage component of DC bus is C, ripple component Asinwt, then DC bus-bar voltage are as follows:
Ud=Asinwt+C
If the movement threshold voltage of varistor is U, according to the C-V characteristic of varistor, then the resistance expression formula of varistor
Are as follows:
R=∞ (as u > U)
R=0(is as u < U)
Since there are certain leakage currents for varistor, after circuit is connected, idle capacity can be charged to gradually close to direct current
The average value of busbar voltage, the end voltage of idle capacity is about at this time are as follows:
Uc=0.5A+C
The end voltage of varistor are as follows:
Uy=Ud-Uc=A(0.5-sinwt)
As long as the threshold voltage U of varistor be greater than Uy, any time varistor impedance R=∞, idle capacity no current,
In stand-by state, when the aging with main capacitance, filter effect decline, A is necessarily increasing, when Uy is greater than U, pressure-sensitive electricity
Resistance initially enters conducting, and idle capacity initially enters filter state, and with the through-flow fever of varistor, final temperature switch is connect
Point closure, idle capacity is fully connected circuit, while because of the combined floodgate dash current of capacitor, temperature switch contact can be spot welded
And it is no longer separated, realize the access of idle capacity.By " backup " of electrolytic capacitor, electricity just is realized with simple dexterously method
Service life of the maximum service life bottleneck of source plug-in unit --- electrolytic capacitor doubles, so as to make power supply device service life to highly effective
Promotion.
Even if outside has installed the electrolytic capacitor of backup additional, the trend of electrolytic capacitor aging is still irreversible, it is therefore desirable to
There is the scheme of a detection ripple voltage, the output ripple size of real-time detection power module could fundamentally prevent power supply
Hidden danger caused by problem.Ripple detection table is substantially exactly the AC compounent measured in DC voltage, as long as therefore using one every
Straight element removes DC component, is then amplifying, whether the size that can measure ripple voltage is out-of-limit.
Quantity and lesser volume in view of power insert, exploitation on-line monitoring scheme is difficult, by proposing one
Kind utilizes LED C-V characteristic, by passive resonance amplification principle, amplifies ripple by simply LC resonance principle, then leads to
LED indicator light site instructions are crossed, it is not only intuitive and reliable, but also compact, while suitable large area low in cost installs additional, exhausted big portion
Dividing industrial Switching Power Supply plug-in unit is fixed frequency, variation duty ratio control mode, because frequency is fixed, so that it may by simply
LC element, sets tuner parameters, can make ripple signal voltage amplification caused by inductance component L both ends, work as power source aging
Ripple voltage aggravates afterwards, and the end voltage of inductance element increases, and after rising to the conducting threshold voltage of LED, LED shines, and shows line
Wave is out-of-limit.The circuit only needs three passive devices, and volume cost is very small and exquisite, can connect with the output of existing power supply plug-in unit
Line end is in parallel, plays the role of intuitive aging alarm.
Claims (5)
1. a kind of DC power supply reliability of service life promotion circuit, the DC supply input including DC circuit, DC power supply are defeated
Entering to hold includes direct-current switch power supply power conversion circuit, the front end connection resistance wire FU in direct-current switch power supply power conversion circuit,
Inductance L1, BR, capacitor C1, direct-current switch power supply power conversion circuit include resistance R1, resistance R2, capacitor C7, resistance R3, two poles
Pipe VD1, Integrated circuit IC 1, capacitor C5, resistance R5, capacitor C8, capacitor C9, capacitor C6, capacitor C2, capacitor C3, resistance R7, two
Pole pipe VD2, diode VD3, Integrated circuit IC 2, resistance R4, resistance R6, inductance L2, capacitor C4 and diode VDZ composition, it is special
Sign is: the both ends capacitor C1 of the direct-current switch power supply power conversion loop input or the both ends capacitor C4 of output end are simultaneously
The stand-by circuit that connection connection is made of varistor Ra, temperature switch K and electrolytic capacitor Ca；The direct-current switch power supply power supply becomes
The both ends for changing the capacitor C4 of loop output are connected in parallel to be made of resonant inductance Lb, light emitting diode VDb and resonant capacitance Cb
Detectable ripple voltage circuit.
2. DC power supply reliability of service life as described in claim 1 promotes circuit, it is characterised in that: the stand-by circuit includes
Varistor Ra is in parallel with temperature switch K, then connects with the electrolytic capacitor Ca.
3. DC power supply reliability of service life as claimed in claim 2 promotes circuit, it is characterised in that: the varistor Ra with
Temperature switch K being packaged as a whole structure.
4. DC power supply reliability of service life as described in claim 1 promotes circuit, it is characterised in that: the detectable ripple electricity
The circuit of pressure includes resonant inductance Lb in parallel with light emitting diode VDb, then connects with the resonant capacitance Cb.
5. DC power supply reliability of service life as described in claim 1 promotes circuit, it is characterised in that: the resonant inductance Lb with
Resonant capacitance Cb is tuned in 80-the 120% of the DC power supply switch pipe oscillation frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910870338.5A CN110535351B (en) | 2019-09-16 | 2019-09-16 | Circuit for improving service life reliability of direct-current power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910870338.5A CN110535351B (en) | 2019-09-16 | 2019-09-16 | Circuit for improving service life reliability of direct-current power supply |
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| CN110535351A true CN110535351A (en) | 2019-12-03 |
| CN110535351B CN110535351B (en) | 2024-01-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110912491A (en) * | 2019-10-08 | 2020-03-24 | 珠海格力电器股份有限公司 | Servo motor control system and method based on capacitance control and servo driver |
| CN113933738A (en) * | 2021-09-08 | 2022-01-14 | 国网甘肃省电力公司电力科学研究院 | Monitoring method and device for switching power supply |
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| EP0578575A1 (en) * | 1992-07-07 | 1994-01-12 | Applications Et Utilisations Des Proprietes Electriques Des Materiaux (Aupem) | Device for operating a discharge tube with a high frequency high voltage signal |
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| CN110535351B (en) | 2024-01-26 |
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