CN219495502U - Electrolytic capacitor protection device for UPS uninterrupted power supply - Google Patents
Electrolytic capacitor protection device for UPS uninterrupted power supply Download PDFInfo
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- CN219495502U CN219495502U CN202320380123.7U CN202320380123U CN219495502U CN 219495502 U CN219495502 U CN 219495502U CN 202320380123 U CN202320380123 U CN 202320380123U CN 219495502 U CN219495502 U CN 219495502U
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- 239000003990 capacitor Substances 0.000 title claims abstract description 95
- 238000005070 sampling Methods 0.000 claims abstract description 31
- 238000001914 filtration Methods 0.000 claims description 4
- 238000009825 accumulation Methods 0.000 abstract description 2
- 239000003792 electrolyte Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000306 component Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model discloses a UPS uninterrupted power supply electrolytic capacitor protection device, which comprises a thermistor, a singlechip and a temperature sampling circuit, wherein the thermistor is arranged on a shell of a bus electrolytic capacitor and is electrically connected with the temperature sampling circuit, and the singlechip is electrically connected with an output end of the temperature sampling circuit. The temperature of the bus electrolytic capacitor can be sensed in real time by arranging the thermistor on the shell of the bus electrolytic capacitor, and then the real-time temperature of the bus electrolytic capacitor can be obtained by the temperature sampling circuit, and the corresponding temperature value can be directly obtained by the singlechip. Working time of the electrolytic capacitor at different temperatures can be known through the singlechip, when the working time accumulation exceeds rated nominal life time of the capacitor at different temperatures, an alarm signal is sent to the UPS uninterrupted power source host to remind a customer of replacing the capacitor, working reliability of the electrolytic capacitor is guaranteed, a user can pre-judge in advance, and damage of corresponding elements is effectively prevented.
Description
Technical Field
The utility model belongs to a protection structure of an electric element, and particularly relates to an electrolytic capacitor protection device of a UPS uninterrupted power supply.
Background
The direct current electrolytic capacitor is used as a core component in the UPS uninterrupted power supply, and has the main functions of filtering alternating current ripple waves of a rectified direct current bus so as to ensure that the power supply shared by the rectifier to the inverter is a pure direct current power supply, otherwise, the normal operation and the practical service life of the power device of the inverter can be influenced, and the heating value of the inverter can be increased.
The capacitor can be installed in a relatively good ventilation position by the traditional UPS uninterrupted power supply, however, in order to ensure the practical effect, the electrolytic capacitor is installed at a position close to a power device of the inverter, otherwise, the practical effect is seriously affected by the overlarge distance. The temperature beside the power device of the inverter is often the place with the highest temperature in the whole UPS uninterrupted power supply, the temperature has the largest influence on the service life of the electrolytic capacitor, and particularly, when the temperature is increased by 10 ℃, the service life of the electrolytic capacitor can be reduced by half, and if the electrolytic capacitor fails, the inverter can be directly damaged, so that the UPS host machine is seriously failed.
In order to improve the service life of the electrolytic capacitor, a part of electrolytic capacitors with high-temperature resistance specifications are selected, but the cost of the electrolytic capacitors is greatly increased, so that the cost of a UPS (uninterrupted Power supply) is increased, and the actual service life of the electrolytic capacitors cannot be well judged; there are also parts of the special heat dissipation fan added to the electrolytic capacitor, resulting in higher cost. However, the service life of the electrolytic capacitor is prolonged within a certain range, the reliability of the electrolytic capacitor can not be known under a high-temperature environment in use, and once the electrolytic capacitor fails, serious damage of a UPS host machine is caused; UPS's are operated in important load positions, and if a fault occurs during use, huge losses will be caused to users.
Disclosure of Invention
The utility model aims to provide a UPS uninterrupted power supply electrolytic capacitor protection device which can solve at least one of the problems.
According to one aspect of the utility model, a UPS uninterrupted power supply electrolytic capacitor protection device is provided, which comprises a thermistor, a singlechip and a temperature sampling circuit, wherein the thermistor is arranged on a shell of a bus electrolytic capacitor, the thermistor is electrically connected with the temperature sampling circuit, and the singlechip is electrically connected with an output end of the temperature sampling circuit.
The beneficial effects of the utility model are as follows: the temperature of the bus electrolytic capacitor can be sensed in real time by arranging the thermistor on the shell of the bus electrolytic capacitor, and then the real-time temperature of the bus electrolytic capacitor can be obtained by the temperature sampling circuit, and the corresponding temperature value can be directly obtained by the singlechip. Because the service life of the electrolytic capacitor is directly related to the ambient temperature, the service life of the electrolytic capacitor is shorter when the ambient temperature is higher; and if the ambient temperature is too high and exceeds the highest rated temperature of the electrolytic capacitor, electrolyte in the electrolytic capacitor can boil to generate overvoltage, so that the pressure release component is irreversibly released to cause electrolyte leakage and permanently damage the electrolytic capacitor, therefore, the working time of the electrolytic capacitor at different temperatures can be known through the singlechip, when the working time accumulation at different temperatures exceeds the rated service life of the capacitor, an alarm signal is sent to the UPS uninterruptible power supply host to remind a customer to replace the capacitor, the working reliability of the electrolytic capacitor is ensured, the user can conveniently predict in advance, and the damage of each corresponding element is effectively prevented.
In some embodiments, the temperature sampling circuit includes an input sampling unit electrically connected to the thermistor, an operational amplifier unit electrically connected to the input sampling unit, and an output filter unit electrically connected to the operational amplifier unit. Therefore, when the ambient temperature changes, the resistance value of the thermistor changes, the thermistor is transmitted to the operational amplifier unit after being input into the sampling unit, so that the operational amplifier output obtains a voltage which also changes along with the change, and the voltage corresponds to a corresponding temperature value through the singlechip.
In some embodiments, the input sampling unit includes a first resistor R3, a second resistor R4, a fourth resistor R6, a fifth resistor R7, and a first capacitor C3, where one ends of the fourth resistor R6 and the fifth resistor are electrically connected to the power supply, one ends of the first capacitor C3 and the thermistor are electrically connected to the other end of the fourth resistor, the other ends of the first capacitor C3 and the thermistor are grounded, one end of the fifth resistor is electrically connected to the power supply, the other ends are serially connected to the first resistor R3 and then grounded, one end of the second resistor R4 is electrically connected to the other end of the fourth resistor, and the other end is grounded. Therefore, through the connection of the elements, the resistor voltage division is realized, and the normal operation of the thermistor is ensured.
In some embodiments, the operational amplifier unit includes a third resistor R5, a sixth resistor Rf, and an operational amplifier, where a non-inverting input terminal of the operational amplifier is electrically connected to the other end of the fourth resistor R6, and both the sixth resistor Rf and an inverting input terminal of the operational amplifier are electrically connected to the other end of the fifth resistor R7, and the other end of the third resistor R5 is electrically connected to the other end of the sixth resistor Rf. Therefore, through the operational amplifier, the operational amplifier can conveniently output a stable voltage.
In some embodiments, the output filter unit includes a zener diode Z1 and a second capacitor C4, where one end of the zener diode Z1 and one end of the second capacitor are electrically connected to the other end of the third resistor R5, and the other end of the zener diode Z1 and the other end of the second capacitor are grounded. Therefore, the output filtering is convenient, and the singlechip is convenient to calculate corresponding temperature values.
Drawings
Fig. 1 is a schematic circuit diagram of a temperature sampling circuit in an electrolytic capacitor protection device of a UPS according to the present utility model.
FIG. 2 is a graphical representation of the lifetime versus temperature of an electrolytic capacitor.
Fig. 3 is a schematic layout structure of an electrolytic capacitor protection device of a UPS in a UPS host according to the present utility model.
Detailed Description
The utility model is described in further detail below with reference to the accompanying drawings.
Reference is made to fig. 1 and 3. The utility model provides a UPS uninterrupted power source electrolytic capacitor protection device, includes thermistor, singlechip and temperature sampling circuit 1, and thermistor locates on the casing of generating line electrolytic capacitor 2, and thermistor is connected with temperature sampling circuit 1 electricity, and the singlechip is connected with temperature sampling circuit 1's output electricity. The thermistor is a linear thermistor, the thermistor is shown in the drawing, and the singlechip is shown by a digital processing chip; the singlechip is in the prior art, can receive voltage signal to convert voltage signal into corresponding temperature signal's singlechip, the specific principle is not repeated.
When the UPS uninterrupted power supply electrolytic capacitor protection device is in actual use, the thermistor is fixed on the metal shell of the bus electrolytic capacitor 2, and the bus electrolytic capacitor 2 is arranged at the position close to the power device 3 of the inverter, so that the practical effect of the bus electrolytic capacitor is guaranteed.
The temperature sampling circuit 1 comprises an input sampling unit 11, an operational amplifier unit 12 and an output filter unit 13, wherein the input sampling unit 11 is electrically connected with a thermistor, the operational amplifier unit 12 is electrically connected with the input sampling unit 11, and the output filter unit 13 is electrically connected with the operational amplifier unit 12.
The input sampling unit 11 includes a first resistor R3, a second resistor R4, a fourth resistor R6, a fifth resistor R7, and a first capacitor C3, where one ends of the fourth resistor R6 and the fifth resistor R7 are electrically connected to a power supply, one ends of the first capacitor C3 and the thermistor are electrically connected to the other end of the fourth resistor R6, the other ends of the first capacitor C3 and the thermistor are grounded, one end of the fifth resistor R7 is electrically connected to the power supply, the other ends are serially connected to the first resistor R3 and then grounded, one end of the second resistor R4 is electrically connected to the other end of the fourth resistor R6, and the other ends are grounded.
The operational amplifier unit 12 includes a third resistor R5, a sixth resistor Rf and an operational amplifier U1, where a non-inverting input terminal of the operational amplifier U1 is electrically connected to the other end of the fourth resistor R6, and both the sixth resistor Rf and an inverting input terminal of the operational amplifier are electrically connected to the other end of the fifth resistor R7, and the other end of the third resistor R5 is electrically connected to the other end of the sixth resistor Rf.
The output filter unit 13 includes a zener diode Z1 and a second capacitor C4, where one end of the zener diode Z1 and one end of the second capacitor C4 are electrically connected to the other end of the third resistor R5, and the other end of the zener diode Z1 and the other end of the second capacitor C4 are grounded.
When the UPS equipment host works, the temperature of the electrolytic capacitor changes, so that the resistance value of the thermistor changes along with the temperature change of the surface of the electrolytic capacitor, then the voltage is divided by the resistor of the input sampling unit 11, and then the voltage is transmitted to the input end of the operational amplifier U1, and the operational amplifier outputs a stable voltage. Since the resistance of the thermistor changes linearly with temperature, the voltage input to the operational amplifier U1 also changes, and the voltage output by the operational amplifier U1 also changes; the output voltage of the operational amplifier U1 is transmitted to the singlechip after passing through the output filter unit, and the singlechip converts the voltage signal into a temperature value, so that the direct observation is facilitated. Therefore, the temperature of the bus electrolytic capacitor is conveniently judged from the single chip microcomputer in a visual way, the service life of the electrolytic capacitor is pre-judged, and when the service life is low to a certain degree, an alarm is sent to inform a user that the bus electrolytic capacitor needs to be replaced.
Since the temperature of the electrolytic capacitor is directly related to the lifetime, a graph of lifetime versus temperature of the electrolytic capacitor (wherein the lifetime is counted in hours and the temperature is counted in degrees celsius) can be specifically seen in fig. 2. When the ripple current is fixed (such as rated ripple current), the service life of the electrolytic capacitor is shorter as the ambient temperature is higher; and if the ambient temperature is too high, the electrolyte in the electrolytic capacitor can boil to generate overvoltage beyond the highest rated temperature of the electrolytic capacitor, so that the pressure release component can irreversibly release pressure, the electrolyte leaks, and the electrolytic capacitor is permanently damaged. Therefore, the storage and use temperatures of the electrolytic capacitor must not exceed the rated temperatures, and the life of the electrolytic capacitor increases exponentially when the ambient temperature is reduced to 40 ℃.
According to the relation between the service life and the temperature of the electrolytic capacitor, if the environment temperature of the electrolytic capacitor is reduced, the service life of the electrolytic capacitor can be greatly prolonged. For example, an electrolytic capacitor rated at a nominal temperature of 85 ℃ has a service life of 3000 hours at an ambient temperature of 85 ℃, whereas the service life can be extended to around 19800 ℃ when the ambient temperature is reduced to 60 ℃. When the ambient temperature is reduced to 40 ℃, the service life can reach about 8 ten thousand hours. In actual use it is often seen that the actual service life of the electrolytic capacitor is far above the nominal value, which is also why the use temperature is below the highest nominal temperature.
Therefore, the time of the electrolytic capacitor working at different temperatures can be calculated in an accumulated mode through the singlechip, and when the accumulated working time at different temperatures exceeds the rated nominal life time of the capacitor, an alarm signal is sent to the UPS host computer to remind a user of replacing the electrolytic capacitor. Through the device, the environment temperature of the electrolytic capacitor can be known, corresponding judgment is made in advance, the maintenance cost and the possibility of serious faults of equipment can be effectively reduced, and the safety and reliability of equipment use are improved. Meanwhile, by adding the device in the UPS uninterrupted power supply, periodic manual maintenance equipment and key device replacement are not needed, and when the key device of the electrolytic capacitor reaches the service life, the key device is replaced, so that the cost of manpower and material resources is greatly saved. Because the faults are prejudged in advance, potential safety hazards are eliminated in advance, the safety and reliability of products are provided, and the equipment safety of users is ensured.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and improvements could be made by those skilled in the art without departing from the inventive concept, which falls within the scope of the present utility model.
Claims (3)
1. The UPS uninterrupted power supply electrolytic capacitor protection device is characterized by comprising a thermistor, a singlechip and a temperature sampling circuit (1), wherein the thermistor is arranged on a shell of a bus electrolytic capacitor (2), the thermistor is electrically connected with the temperature sampling circuit (1), and the singlechip is electrically connected with an output end of the temperature sampling circuit (1);
the temperature sampling circuit (1) comprises an input sampling unit (11), an operational amplifier unit (12) and an output filtering unit (13), wherein the input sampling unit (11) is electrically connected with a thermistor, the operational amplifier unit (12) is electrically connected with the input sampling unit (11), and the output filtering unit (13) is electrically connected with the operational amplifier unit (12);
the input sampling unit (11) comprises a first resistor (R3), a second resistor (R4), a fourth resistor (R6), a fifth resistor (R7) and a first capacitor (C3), wherein one ends of the fourth resistor (R6) and the fifth resistor (R7) are electrically connected with a power supply, one ends of the first capacitor (C3) and the thermistor are electrically connected with the other end of the fourth resistor (R6), the other ends of the first capacitor (C3) and the thermistor are grounded, one end of the fifth resistor (R7) is electrically connected with the power supply, the other end of the fifth resistor (R7) is connected with the first resistor (R3) in series and then grounded, one end of the second resistor (R4) is electrically connected with the other end of the fourth resistor (R6), and the other end of the second resistor (R4) is grounded.
2. The UPS uninterruptible power supply electrolytic capacitor protection device according to claim 1, wherein the operational amplifier unit (12) includes a third resistor (R5), a sixth resistor (Rf) and an operational amplifier (U1), the non-inverting input terminal of the operational amplifier (U1) is electrically connected to the other end of the fourth resistor (R6), both the sixth resistor (Rf) and the inverting input terminal of the operational amplifier are electrically connected to the other end of the fifth resistor (R7), and the other end of the third resistor (R5) is electrically connected to the other end of the sixth resistor (Rf).
3. The UPS uninterruptible power supply electrolytic capacitor protection device according to claim 2, wherein the output filter unit (13) includes a zener diode (Z1) and a second capacitor (C4), one end of the zener diode (Z1) and one end of the second capacitor (C4) are electrically connected to the other end of the third resistor (R5), and the other end of the zener diode (Z1) and the other end of the second capacitor (C4) are grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320380123.7U CN219495502U (en) | 2023-02-24 | 2023-02-24 | Electrolytic capacitor protection device for UPS uninterrupted power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320380123.7U CN219495502U (en) | 2023-02-24 | 2023-02-24 | Electrolytic capacitor protection device for UPS uninterrupted power supply |
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| Publication Number | Publication Date |
|---|---|
| CN219495502U true CN219495502U (en) | 2023-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320380123.7U Active CN219495502U (en) | 2023-02-24 | 2023-02-24 | Electrolytic capacitor protection device for UPS uninterrupted power supply |
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| Country | Link |
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| CN (1) | CN219495502U (en) |
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- 2023-02-24 CN CN202320380123.7U patent/CN219495502U/en active Active
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Address after: No. 2389, Xinkai Road, Economic and Technological Development Zone, Zhongdai Street, Pinghu City, Jiaxing, Zhejiang Province 314200 Patentee after: Yunzheng (Shanghai) Information Technology Co.,Ltd. Country or region after: China Address before: No. 2389, Xinkai Road, Economic and Technological Development Zone, Zhongdai Street, Pinghu City, Jiaxing, Zhejiang Province 314200 Patentee before: Yunzheng (Zhejiang) Information Technology Co.,Ltd. Country or region before: China |