CN210201718U - Direct current power supply service life reliability improving circuit - Google Patents
Direct current power supply service life reliability improving circuit Download PDFInfo
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- CN210201718U CN210201718U CN201921531720.5U CN201921531720U CN210201718U CN 210201718 U CN210201718 U CN 210201718U CN 201921531720 U CN201921531720 U CN 201921531720U CN 210201718 U CN210201718 U CN 210201718U
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Abstract
The utility model relates to a DC power supply's technical field especially relates to a DC power supply life reliability lifting circuit. Two ends of a capacitor C1 at the input end of a direct-current switch power supply conversion loop at the input end of the direct-current power supply or two ends of a capacitor C4 at the output end of the direct-current switch power supply conversion loop are connected in parallel with a standby circuit consisting of a piezoresistor Ra, a temperature switch K and an electrolytic capacitor Ca; and two ends of a capacitor C4 at the output end of the direct-current switching power supply conversion loop 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, the power supply with the aging signs can be found at the first time, the power supply board card which is aged but not damaged can be removed as soon as possible, 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 utility model relates to a direct current circuit especially relates to a direct current power supply life reliability lifting circuit.
Background
The application of the direct-current switch power supply is very wide, in the power industry, the direct-current switch power supply almost occupies the power supply module of all control protection equipment, however, the switch power supply is limited by the process problem of an internal capacitor, the switch power supply is often aged slowly, sometimes, great hidden danger is brought to the operation of power secondary equipment, according to incomplete statistics, the defects or accidents of a plurality of transformer substation control protection systems are all from the power supply problem of the internal power supply, the problem is particularly obvious in a converter station, the direct-current power supply board card abnormity leads to the frequent occurrence of direct-current power transmission blocking accidents, and compared with a traditional linear voltage-stabilized power supply, the switch power supply module has the advantages of small volume, high efficiency, low cost and high automation degree, and is widely applied in the field of industrial control. However, the switching power supply also has the obvious disadvantage of fast aging speed, which may bring hidden trouble to the power supply equipment.
The switch power supply adjusts and converts voltage by using the PWM chopping principle through the uninterrupted switching of an internal switching tube, and the switching frequency can have smaller volume and higher efficiency until reaching more than 30 KHz. The high switching frequency puts higher requirements on the filter capacitor of the output end, and because the capacity of the common non-polar capacitor is small, the filter capacitor of the output end needs to adopt an electrolytic capacitor, the high-frequency loss of the electrolytic capacitor is large, the electrolytic capacitor can generate heat under the action of high-frequency current to age and dry, but the electrolytic capacitor is not suddenly damaged but gradually ages, so that the filtering effect of the power module is reduced year by year, and the output ripple wave is increased year by year. The control protection board card has high requirements on a power supply, a program can be mistakenly run away due to slight fluctuation, when the ripple of a power supply module is increased to a certain amplitude, the operation of the board card is inevitably obviously influenced, sudden failure or dead halt of the related board card is easily caused along with the increase of instability, ripple, internal resistance and alternating current components of output voltage, and even a tripping and locking instruction is mistakenly sent.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the above-mentioned defect, provide a direct current power supply life reliability lifting circuit.
In order to overcome the defect that exists among the background art, the utility model provides a technical scheme that its technical problem adopted is: the circuit for improving the service life reliability of the direct-current power supply comprises a direct-current power supply input end of a 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 resistance wire FU, an inductor L1, 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 is: two ends of a capacitor C1 at the input end of the direct-current switch power supply conversion loop or two ends of a capacitor C4 at the output end of the direct-current switch power supply conversion loop are connected in parallel with a standby circuit consisting of a piezoresistor Ra, a temperature switch K and an electrolytic capacitor Ca; and two ends of a capacitor C4 at the output end of the direct-current switching power supply conversion loop 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, it further comprises that the backup circuit comprises a voltage dependent resistor 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, further comprising the piezoresistor Ra and the temperature switch K are packaged as an integrated structure.
According to another embodiment of the present invention, the circuit for detecting the ripple voltage further comprises a resonant inductor Lb connected in parallel with the light emitting diode VDb and 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 switch.
The utility model has the advantages that:
1. through the provided electrolytic capacitor backup technology, through the backup of the electrolytic capacitor, the maximum service life bottleneck of the power supply plug-in unit, namely the service life multiplication of the electrolytic capacitor is realized by a simple and ingenious method, thereby the service life of the power supply device can be effectively improved, the prior art needs to improve the service life of the switching power supply by times, the cost of the whole machine is needed to be spent at least 3 times, the electrolytic capacitor is replaced by the solid capacitor or the ceramic capacitor, and the utility model discloses only need to increase the electrolytic capacitor of a common backup, the piezoresistor and the temperature switch cost are all very low, therefore the utility model discloses only need to increase the cost less than 15%, just can realize the multiplication of the service life of the power supply;
2. the monitoring of the out-of-limit ripple waves is realized through the provided LC resonance scheme, the whole circuit only needs three passive devices, the cost is far lower than that of an off-line ripple wave detection instrument in the prior art, the manual periodic detection is not needed, and in addition, the simple and small promotion is realized, the off-line ripple wave detection instrument can be additionally arranged in any power supply module almost, and the real-time monitoring of the aging degree of the power supply is realized;
3. the service life of the existing direct-current power supply product can be greatly prolonged, the power supply with the aging signs can be found at the first time, the power supply board card which is aged but not damaged can be removed as soon as possible, 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 present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic structural diagram of another embodiment.
Detailed Description
As shown in fig. 1, the circuit for improving the service life reliability of the dc power supply includes a dc power supply input end of a dc circuit, the dc power supply input end includes a dc switching power supply conversion loop, a front end of the dc switching power supply conversion loop is connected to a resistance wire FU, an inductor L1, a rectifier BR, and a capacitor C1, and the dc switching power supply conversion loop 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.
Two ends of a capacitor C1 at the input end of the direct-current switch power supply conversion loop or two ends of a capacitor C4 at the output end of the direct-current switch power supply conversion loop are connected in parallel with a standby circuit consisting of a piezoresistor Ra, a temperature switch K and an electrolytic capacitor Ca; and two ends of a capacitor C4 at the output end of the direct-current switching power supply conversion loop 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 embodiment(s) of the invention
The piezoresistor Ra and the temperature switch K are packaged into an integrated structure.
Preferred embodiment(s) of the invention
The resonant inductor Lb and the resonant capacitor Cb are tuned to 80-120% of the oscillation frequency of the dc power switch.
Example 1
As shown in fig. 1, a ripple voltage detectable circuit composed of a resonant inductor Lb, a light emitting diode VDb and a resonant capacitor Cb is connected in parallel to two ends of a capacitor C1 at an input end of a dc switching power supply conversion loop, a ripple voltage detectable circuit composed of a resonant inductor Lb, a light emitting diode VDb and a resonant capacitor Cb is connected in parallel to two ends of a capacitor C4 at an output end of a dc switching power supply conversion loop, and the ripple voltage detectable circuit has a specific structure including the resonant inductor Lb connected in parallel with the light emitting diode VDb and connected in series with the resonant capacitor Cb. Even if a 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, the output ripple magnitude of a power supply module is detected in real time, and hidden danger caused by power supply problems can be fundamentally avoided.
Example 2
As shown in fig. 2, a ripple voltage detectable circuit composed of a resonant inductor Lb, a light emitting diode VDb and a resonant capacitor Cb is connected in parallel to both ends of a capacitor C4 at the output end of the dc switching power supply conversion loop, and is also connected in parallel to a ripple voltage detectable circuit, and the ripple voltage detectable circuit has a specific structure including a resonant inductor Lb connected in parallel to the light emitting diode VDb and then connected in series to the resonant capacitor Cb. Even if a 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, the output ripple magnitude of a power supply module is detected in real time, and hidden danger caused by power supply problems 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 can be changed into smooth direct current voltage for load use only after being smoothed by the filter capacitor at the output end. After the condenser is ageing, its dielectric loss angle can rise by a wide margin to the order descends through the ability of high order alternating current component, and its electric capacity also can reduce, thereby makes the speed of discharging increase, the utility model discloses an easy ageing problem of electrolysis electricity is overcome to the principle of electrolytic capacitor backup. The specific principle is that a backup electrolytic capacitor is connected with an 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 low, the piezoresistor is not conducted, when 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 backup capacitor starts to have high-frequency ripple current flowing, because the piezoresistor is rapidly heated after conduction, when the temperature is increased to a certain value, the temperature switch is heated, the contact is closed, the backup electrolytic capacitor is accessed into the loop to play a filtering role, the backup effect of the electrolytic capacitor is realized, because the capacity of the electrolytic capacitor is large, when the backup capacitor is accessed into the loop through a mechanical temperature switch, when the circuit is switched on, larger impact current can be generated, the current can play a role of spot welding on the K contact of the temperature switch, the contact of the temperature switch is permanently closed, and the standby electrolytic capacitor is completely switched on to replace an aged capacitor.
If the direct current voltage of the direct current bus is divided into C, the ripple component is Asinwt, then the direct current bus voltage is:
Ud=Asinwt+C
setting the action threshold voltage of the piezoresistor as U, and according to the volt-ampere characteristic of the piezoresistor, the resistance expression of the piezoresistor is as follows:
r = ∞ (when U > U)
R =0 (when U < U)
Because the voltage dependent resistor has certain leakage current, after the loop is switched on, the spare capacitor can be gradually charged to be close to the average value of the direct current bus voltage, and the terminal voltage of the spare capacitor is about:
Uc=0.5A+C
the terminal voltage of the varistor is:
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 = ∞ at any time, the reserve capacitor has no current, and is in a reserve state, when the aging of the main capacitor is carried out, the filtering effect is reduced, A is inevitably greater and greater, when Uy is greater than U, the piezoresistor starts to be conducted, the reserve capacitor starts to be in a filtering state, the through-flow of the piezoresistor generates heat, the final temperature switch contact is closed, the reserve capacitor is completely connected into a loop, meanwhile, because of the closing impact current of the capacitor, the temperature switch contact can be not separated by spot welding, and the access of the reserve capacitor is realized. The maximum service life bottleneck of the power supply plug-in is realized by a simple and ingenious method through the backup of the electrolytic capacitor, namely the service life of the electrolytic capacitor is multiplied, so that the service life of the power supply device can be effectively prolonged.
Even if a 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, the output ripple magnitude of a power supply module is detected in real time, and hidden danger caused by power supply problems can be fundamentally avoided. The ripple detection meter essentially measures the ac component in the dc voltage, so that the dc component can be removed by using a dc blocking element, and then amplified to determine whether the ripple voltage is out of limit.
The ripple wave signal voltage generated at two ends of an inductance element L can be amplified by simply setting tuning parameters through an LC element due to fixed frequency, most industrial switch power supply plug-ins are in a fixed frequency and variable duty ratio control mode, the ripple wave signal voltage is amplified through the LC element due to fixed frequency, when the power supply is aged, the end voltage of the inductance element is increased, and when the ripple wave signal voltage is increased to the conduction threshold voltage of the LED, the LED emits light to display the out-of-limit ripple wave. The circuit only needs three passive devices, is small in volume cost, can be connected with an output terminal of an existing power supply plug-in parallel, and plays a visual aging warning role.
Claims (5)
1. A kind of direct current power supply life reliability promoting circuit, including the direct current power supply input end of the direct current circuit, the direct current power supply input end includes the direct current switching power supply conversion loop, the front end of the direct current switching power supply conversion loop connects the resistance wire FU, inductance L1, BR, electric capacity C1, the direct current switching power supply conversion loop 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 make up, its characteristic lies in that: two ends of a capacitor C1 at the input end of the direct-current switch power supply conversion loop or two ends of a capacitor C4 at the output end of the direct-current switch power supply conversion loop are connected in parallel with a standby circuit consisting of a piezoresistor Ra, a temperature switch K and an electrolytic capacitor Ca; and two ends of a capacitor C4 at the output end of the direct-current switching power supply conversion loop 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.
2. The dc power supply life reliability enhancement circuit of claim 1, wherein: the standby circuit comprises a voltage dependent resistor Ra connected with a temperature switch K in parallel and then connected with the electrolytic capacitor Ca in series.
3. The dc power reliability enhancement circuit of claim 2, wherein: and the piezoresistor Ra and the temperature switch K are packaged into an integrated structure.
4. The dc power supply life reliability enhancement circuit of claim 1, wherein: the circuit capable of detecting the ripple voltage comprises a resonant inductor Lb connected in parallel with the light emitting diode VDb and connected in series with the resonant capacitor Cb.
5. The dc power supply life reliability enhancement circuit of claim 1, wherein: the resonant inductor Lb and the resonant capacitor Cb are tuned to 80-120% of the oscillation frequency of the dc power switch tube.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921531720.5U CN210201718U (en) | 2019-09-16 | 2019-09-16 | Direct current power supply service life reliability improving circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921531720.5U CN210201718U (en) | 2019-09-16 | 2019-09-16 | Direct current power supply service life reliability improving circuit |
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| CN210201718U true CN210201718U (en) | 2020-03-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315388A (en) * | 2021-06-25 | 2021-08-27 | 江苏容正医药科技有限公司 | High-power-density long-life high-frequency pulse alternating-current power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315388A (en) * | 2021-06-25 | 2021-08-27 | 江苏容正医药科技有限公司 | High-power-density long-life high-frequency pulse alternating-current power supply |
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