CN110535351B - Circuit for improving service life reliability of direct-current power supply - Google Patents
Circuit for improving service life reliability of direct-current power supply Download PDFInfo
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- CN110535351B CN110535351B CN201910870338.5A CN201910870338A CN110535351B CN 110535351 B CN110535351 B CN 110535351B CN 201910870338 A CN201910870338 A CN 201910870338A CN 110535351 B CN110535351 B CN 110535351B
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- 239000003990 capacitor Substances 0.000 claims abstract description 93
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 230000032683 aging Effects 0.000 abstract description 12
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000005856 abnormality Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 6
- 238000001914 filtration Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000002427 irreversible effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000007787 solid Substances 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 invention relates to the technical field of direct-current power supplies, in particular to a circuit for improving the service life reliability of a direct-current power supply. The two ends of a capacitor C1 at the input end or the two ends of a capacitor C4 at the output end of a direct-current switching power supply conversion circuit at the input end of the direct-current power supply are connected in parallel with a standby circuit consisting of a piezoresistor Ra, a temperature switch K and an electrolytic capacitor Ca; the two ends of a capacitor C4 at the output end of the direct-current switching power supply conversion circuit are connected in parallel with a circuit which is composed of a resonant inductor Lb, a light-emitting diode VDb and a resonant capacitor Cb and can detect ripple voltage. The service life of the existing direct-current power supply product can be greatly prolonged, a power supply with aging signs can be found out at the first time, and the power supply board which is aged and not damaged is removed early, so that the operation reliability of important equipment such as power control protection equipment can be effectively improved, and the accident probability caused by equipment abnormality is reduced.
Description
Technical Field
The present invention relates to a dc circuit, and more particularly, to a life reliability enhancing circuit for a dc power supply.
Background
The direct current switch power supply is widely applied, in the power industry, the direct current switch power supply almost occupies the share of power supply modules of all control protection devices, however, the switch power supply is limited by the process problem of an internal capacitor, often aging slowly, sometimes brings great hidden danger to the operation of power secondary devices, according to incomplete statistics, many defects or accidents of a transformer substation control protection system come from the power supply problem of the internal power supply, the problem is particularly remarkable in a convertor station, the accident of direct current power supply board abnormal leading to direct current transmission locking happens frequently, and compared with the traditional linear stabilized power supply, the switch power supply module has the advantages of small volume, high efficiency, low cost and high automation degree, so the switch power supply module is widely adopted in the industrial control field. However, the switching power supply also has obvious disadvantages of high aging speed and potential hazards to power supply equipment.
The switching power supply can regulate and change voltage by using a PWM chopping principle through an internal switching tube without stopping switching, and the switching frequency can reach more than 30KHz, so that the switching power supply has smaller volume and higher efficiency. The high switching frequency puts higher requirements on the filter capacitor at the output end, and the common nonpolar capacitor has small capacity, so that the filter capacitor at the output end is required to adopt an electrolytic capacitor, the electrolytic capacitor has high-frequency loss, and can generate heat under the action of high-frequency current to age and dry, however, the electrolytic capacitor is not damaged suddenly but aged gradually, and the filter effect of the power supply module is reduced year by year, and the output ripple wave is increased year by year. The requirements of the control protection board card on the power supply are very high, the program is caused to run by mistake and fly by slight fluctuation, when the ripple wave of the power supply module is increased to a certain amplitude, the operation of the board card is obviously influenced necessarily, the sudden fault or the dead halt of the relevant board card is easily caused along with the instability of the output voltage, the ripple wave, the internal resistance and the increase of alternating current components, and even the tripping locking instruction is wrongly issued, however, no technology for detecting the output ripple wave of the power supply module exists in the prior art, so that hidden troubles caused by the aging of the switching power supply are always pending.
Disclosure of Invention
The invention aims to solve the defects and provide a circuit for improving the service life reliability of a direct current power supply.
In order to overcome the defects in the background art, the technical scheme adopted by the invention for solving the technical problems is as follows: the life reliability improving circuit of the direct current power supply comprises a direct current power supply input end of the direct current circuit, wherein the direct current power supply input end comprises a direct current switching power supply conversion loop, the front end of the direct current switching power supply conversion loop is connected with a resistor FU, an inductor L1, a resistor BR and a capacitor C1, the direct current switching power supply conversion loop comprises a resistor R1, a resistor R2, a capacitor C7, a resistor R3, a diode VD1, an integrated circuit IC1, a capacitor C5, a resistor R5, a capacitor C8, a capacitor C9, a capacitor C6, a capacitor C2, a capacitor C3, a resistor R7, a diode VD2, a diode VD3, an integrated circuit IC2, a resistor R4, a resistor R6, an inductor L2, a capacitor C4 and a diode VDZ, and the life reliability improving circuit is characterized in that: the two ends of a capacitor C1 at the input end or the two ends of a capacitor C4 at the output end of the direct-current switching power supply conversion circuit are connected in parallel with a standby circuit consisting of a piezoresistor Ra, a temperature switch K and an electrolytic capacitor Ca; the two ends of a capacitor C4 at the output end of the direct-current switching power supply conversion circuit are connected in parallel with a circuit which is composed of a resonant inductor Lb, a light-emitting diode VDb and a resonant capacitor Cb and can detect ripple voltage.
According to another embodiment of the present invention, the standby circuit further comprises a piezoresistor Ra connected in parallel with the temperature switch K and then connected in series with the electrolytic capacitor Ca.
According to another embodiment of the present invention, the varistor Ra and the temperature switch K are packaged as an integrated structure.
According to another embodiment of the present invention, the circuit further includes a resonant inductor Lb connected in parallel with the light emitting diode VDb and then connected in series with the resonant capacitor Cb.
According to another embodiment of the present invention, the resonant inductor Lb and the resonant capacitor Cb are tuned to 80-120% of the oscillation frequency of the dc power switching tube.
The beneficial effects of the invention are as follows:
1. through the electrolytic capacitor backup technology, the maximum service life bottleneck of the power plug-in unit, namely the service life multiplication of the electrolytic capacitor, is realized by a simple and ingenious method through the backup of the electrolytic capacitor, so that the service life of a power supply device is improved very effectively, the service life of a switching power supply is required to be improved in multiple, the cost of at least 3 times of the whole machine is required to be increased in the prior art, the electrolytic capacitor is replaced by a solid capacitor or a ceramic capacitor, and the invention only needs to be increased by one common backup electrolytic capacitor, and the cost of a piezoresistor and a temperature switch is very low, so that the invention only needs to be increased by less than 15 percent, and the multiplication of the service life of the power supply can be realized as well;
2. the ripple out-of-limit monitoring is realized through the proposed LC resonance scheme, the whole circuit only needs three passive devices, the cost is far lower than that of an off-line ripple detection instrument in the prior art, the manual periodic detection is not needed, in addition, the simple and small proposal is adopted, and the real-time monitoring of the power supply aging degree can be realized by additionally installing the device in any power supply module;
3. the service life of the existing direct-current power supply product can be greatly prolonged, a power supply with aging signs can be found out at the first time, and the power supply board which is aged and not damaged is removed early, so that the operation reliability of important equipment such as power control protection equipment can be effectively improved, and the accident probability caused by equipment abnormality is reduced.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic structural view of another embodiment.
Detailed Description
As shown in fig. 1, the life reliability improving circuit of the dc power supply includes a dc power supply input end of the dc circuit, the dc power supply input end includes a dc switching power supply conversion circuit, and a front end of the dc switching power supply conversion circuit is connected to a resistor FU, an inductor L1, a rectifier BR, and a capacitor C1, and the dc switching power supply conversion circuit includes a resistor R1, a resistor R2, a capacitor C7, a resistor R3, a diode VD1, an integrated circuit IC1, a capacitor C5, a resistor R5, a capacitor C8, a capacitor C9, a capacitor C6, a capacitor C2, a capacitor C3, a resistor R7, a diode VD2, a diode VD3, an integrated circuit IC2, a resistor R4, a resistor R6, an inductor L2, a capacitor C4, and a diode VDZ.
The two ends of a capacitor C1 at the input end or the two ends of a capacitor C4 at the output end of the direct-current switching power supply conversion circuit are connected in parallel with a standby circuit consisting of a piezoresistor Ra, a temperature switch K and an electrolytic capacitor Ca; the two ends of a capacitor C4 at the output end of the direct-current switching power supply conversion circuit are connected in parallel with a circuit which is composed of a resonant inductor Lb, a light-emitting diode VDb and a resonant capacitor Cb and can detect ripple voltage.
Preferred embodiments
The piezoresistor Ra and the temperature switch K are packaged into an integrated structure.
Preferred embodiments
The resonant inductance Lb and the resonant capacitance Cb are tuned to 80-120% of the oscillation frequency of the DC power supply switching tube.
Example 1
As shown in fig. 1, two ends of a capacitor C1 at the input end of the dc switching power supply conversion circuit are connected in parallel with a circuit capable of detecting a ripple voltage, which is composed of a resonant inductor Lb, a light emitting diode VDb and a resonant capacitor Cb, and two ends of a capacitor C4 at the output end of the dc switching power supply conversion circuit are connected in parallel with a circuit capable of detecting a ripple voltage, which is composed of a resonant inductor Lb, a light emitting diode VDb and a resonant capacitor Cb. Even if the backup electrolytic capacitor is additionally arranged outside, the aging trend of the electrolytic capacitor is still irreversible, so that a scheme for detecting ripple voltage is needed, and the output ripple size of the power supply module is detected in real time, so that hidden danger caused by the power supply problem can be fundamentally avoided.
Example 2
As shown in fig. 2, two ends of a capacitor C4 at the output end of the dc switching power supply conversion circuit are connected in parallel with a circuit capable of detecting ripple voltage, which is composed of a resonant inductor Lb, a light emitting diode VDb and a resonant capacitor Cb, and simultaneously connected in parallel with a circuit capable of detecting ripple voltage. Even if the backup electrolytic capacitor is additionally arranged outside, the aging trend of the electrolytic capacitor is still irreversible, so that a scheme for detecting ripple voltage is needed, and the output ripple size of the power supply module is detected in real time, so that hidden danger caused by the power supply problem can be fundamentally avoided.
The direct-current voltage output by the switching power supply is a series of pulse voltages with a certain duty ratio, and the direct-current voltage can be changed into a smooth direct-current voltage for a load only after being flattened by a filter capacitor at an output end. After the capacitor is aged, the dielectric loss angle of the capacitor can be greatly increased, so that the capacity of passing through high-order alternating current components is reduced, and the capacitance of the capacitor is also reduced, so that the discharging speed is increased. The backup electrolytic capacitor is connected with the original main capacitor loop in parallel through a parallel loop of a piezoresistor, a resistor and a temperature switch, the temperature switch and the piezoresistor are integrally packaged, when the filtering effect of the main capacitor is normal, the ripple voltage on a direct current bus is lower, the piezoresistor is not conducted, after the filtering effect of the main capacitor is reduced, the ripple of the direct current bus is gradually increased, when the ripple peak value exceeds the threshold voltage of the piezoresistor, the piezoresistor is conducted, the standby capacitor starts to have high-frequency ripple current to flow, as the piezoresistor is conducted and rapidly heats up, after the temperature rises to a certain value, the temperature switch is heated, the contact is closed, the standby electrolytic capacitor is connected with the loop to play a role of filtering, the backup effect of the electrolytic capacitor is realized, and as the capacity of the electrolytic capacitor is larger, when the standby capacitor is connected with the loop through the temperature switch, the circuit is connected with instant larger impact current, the effect of spot welding is realized on the K contact of the temperature switch, the contact of the temperature switch is permanently closed, and the effect of the standby electrolytic capacitor is completely connected with and replaced by the aging capacitor is realized.
Let the DC voltage component of the DC bus be C, the ripple component be Asinwt, then the DC bus voltage is:
Ud=Asinwt+C
let the action threshold voltage of piezo-resistor be U, according to the volt-ampere characteristic of piezo-resistor, then the resistance expression of piezo-resistor is:
r= infinity (when U > U)
R=0 (when U < U)
Because the piezoresistor has certain leakage current, after the loop is connected, the backup capacitor can be charged gradually to be close to the average value of the voltage of the direct current bus, and the terminal voltage of the backup capacitor is about:
Uc=0.5A+C
the terminal voltage of the piezoresistor is as follows:
Uy=Ud-Uc=A（0.5-sinwt）
as long as the threshold voltage U of the piezoresistor is greater than Uy, then the piezoresistor impedance R= infinity at any time, the spare capacitor is in a spare state, when the filtering effect is reduced along with the aging of the main capacitor, A is necessarily larger and larger, when Uy is greater than U, the piezoresistor starts to be conducted, the spare capacitor starts to be in a filtering state, and as the through current of the piezoresistor heats up, the final temperature switch contact is closed, the spare capacitor is completely connected into a loop, and meanwhile, the temperature switch contact can be spot-welded and not separated any more due to the closing impact current of the capacitor, so that the connection of the spare capacitor is realized. Through the backup of the electrolytic capacitor, the service life bottleneck of the maximum service life of the power plug-in unit, namely the service life multiplication of the electrolytic capacitor, is realized by a simple and ingenious method, so that the service life of the power supply device can be effectively prolonged.
Even if the backup electrolytic capacitor is additionally arranged outside, the aging trend of the electrolytic capacitor is still irreversible, so that a scheme for detecting ripple voltage is needed, and the output ripple size of the power supply module is detected in real time, so that hidden danger caused by the power supply problem can be fundamentally avoided. The ripple detection meter essentially measures an ac component in a dc voltage, so that it is possible to measure whether the magnitude of the ripple voltage is out of limit by removing the dc component by using a dc blocking element and then amplifying the dc component.
In view of the number of power supply plug-ins and the small volume, the difficulty of developing an on-line monitoring scheme is great, by utilizing the characteristic of LED volt-amperes, by utilizing the passive resonance amplification principle, ripple waves are amplified by utilizing the simple LC resonance principle, then the ripple waves are indicated on site through an LED indicator lamp, the on-line monitoring system is visual and reliable, the on-line monitoring system is small in size, meanwhile, the cost is low, the on-line monitoring system is suitable for large-area installation, most industrial switch power supply plug-ins are all in a fixed frequency and variable duty ratio control mode, due to the fixed frequency, the ripple wave signal voltage generated at two ends of an inductance element L can be amplified by utilizing the simple LC element, the ripple wave voltage is increased after the power supply is aged, the end voltage of the inductance element is increased, and after the on-state threshold voltage of the LED is increased, the LED emits light, and the ripple wave is displayed out of limit. The circuit only needs three passive devices, has very small volume cost, can be connected with the output terminal of the existing power plug-in unit in parallel, and plays a role in visual aging warning.
Claims (3)
1. The utility model provides a DC power supply life-span reliability boost circuit, the DC power supply input of DC circuit is including DC switching power supply conversion circuit, DC switching power supply conversion circuit's front end connection resistance wire FU, inductance L1, rectification BR, electric capacity C1, DC switching power supply conversion circuit includes resistance R1, resistance R2, electric capacity C7, resistance R3, diode VD1, integrated circuit IC1, electric capacity C5, resistance R5, electric capacity C8, electric capacity C9, electric capacity C6, electric capacity C2, electric capacity C3, resistance R7, diode VD2, diode VD3, integrated circuit IC2, resistance R4, resistance R6, inductance L2, electric capacity C4 and diode VDZ constitute, its characterized in that: the two ends of a capacitor C1 at the input end or the two ends of a capacitor C4 at the output end of the direct-current switching power supply conversion circuit are connected in parallel with a standby circuit consisting of a piezoresistor Ra, a temperature switch K and an electrolytic capacitor Ca; the circuit capable of detecting the ripple voltage is composed of a resonant inductor Lb, a light emitting diode VDb and a resonant capacitor Cb, wherein the two ends of a capacitor C4 at the output end of the direct current switching power supply conversion circuit are connected in parallel, the standby circuit comprises a piezoresistor Ra and a temperature switch K which are connected in parallel and then connected in series with an electrolytic capacitor Ca, and the circuit capable of detecting the ripple voltage comprises the resonant inductor Lb and the light emitting diode VDb which are connected in parallel and then connected in series with the resonant capacitor Cb.
2. The dc power life reliability improvement circuit of claim 1, wherein: the piezoresistor Ra and the temperature switch K are packaged into an integrated structure.
3. The dc power life reliability improvement circuit of claim 1, wherein: the resonant inductance Lb and the resonant capacitance Cb are tuned to 80-120% of the oscillating frequency of the DC power supply switching tube.
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| Application Number | Priority Date | Filing Date | Title |
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| 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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| 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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| 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 |
| CN113933738B (en) * | 2021-09-08 | 2024-04-16 | 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 |
| JP2001157466A (en) * | 1999-11-25 | 2001-06-08 | Matsushita Electric Works Ltd | Power source system |
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