KR102189462B1 - A low-noise uninterruptible power supply that can be selectively used by a water-cooled cooling unit and a cooling method of the inverter unit of the uninterruptible power supply unit - Google Patents

Abstract

The present invention relates to a low-noise uninterruptible power supply device capable of selectively using a water-cooled cooling unit, and a cooling method of an inverter unit of the uninterruptible power supply device. More particularly, the present invention relates to a low-noise uninterruptible power supply device capable of selectively using a water-cooled cooling unit, and a cooling method of an inverter unit of the uninterruptible power supply device, to prevent heat saturation in which internal parts of the inverter unit are damaged by enabling the use of the water-cooled cooling unit efficient in cooling in order to effectively cool the heat generated when an IGBT or FET, which is a high-speed switching element used in the inverter unit of the uninterruptible power supply device is operated. In addition, provided is the low-noise uninterruptible power supply device in which audible noise emitted to the outside is reduced to less than the regulation to suit a user environment since the audible noise less than a specific decibel of 60 to 65 dB is enforced as a standard due to the characteristics of the uninterruptible power supply device.

Description

A low-noise uninterruptible power supply that can be selectively used by a water-cooled cooling unit and a cooling method of the inverter unit of the uninterruptible power supply unit}

The present invention relates to a low-noise uninterruptible power supply that can be selectively used by a water-cooled cooling unit and a cooling method of the inverter unit of the uninterruptible power supply unit, and more specifically, an IGBT or a high-speed switching element used in the inverter unit of the uninterruptible power supply unit or In order to effectively cool the heat generated during operation of the FET, a water-cooled cooling unit that is efficient in cooling efficiency can be used to prevent heat saturation, which damages the internal parts of the inverter unit, and due to the nature of the uninterruptible power supply. Low noise uninterruptible power supply and the uninterruptible power supply that can optionally be used with a water-cooled cooling unit in which audible noise emitted to the outside is reduced to noise below the regulation to suit the user environment as audible noise less than a specific decibel of ~65DB is enforced as a standard. It relates to a cooling method of the inverter unit of.

In general, the uninterruptible power supply is also referred to as a UPS device, and continuously supplies a constant voltage and frequency to the load device in case of fluctuations in the commercial power and generator power of the system. It is a device that continuously maintains and supplies power during the exhaustion period, and this uninterruptible power supply was developed to reduce damage such as data loss and information loss as the industry develops. In the current society where computers are mainly used, it is marketable. As power generation has increased day by day, it is mainly used in the field of power electronic circuits, and it is used for the protection of information even in homes using many computers, and as a non-face-to-face environment is created due to a virus such as corona, its use is increasing further.

In particular, in recent years, as the demand for small and medium-sized businesses increases and the demand for electronic devices to be installed in homes and offices increases, it is used when electricity is cut off that is operated by electricity and electronic devices such as servers, air conditioners and elevators. When the uninterruptible power supply is installed indoors, the use of 60~65DB or less is compulsory, but there is no specific realization method for this.

In such uninterruptible power supply devices, the use of IGBTs or FETs suitable for high-voltage/high-current characteristics in the inverter part is widely used, and accordingly, a large amount of heat is generated from the switching element due to the characteristics of the device, and the heat generated from these switching elements must be cooled Therefore, the switching element is cooled by a forced air cooling method through a fan, and the operation characteristics of the switching element, IGBT or FET, determine the reliability of the uninterruptible power supply, and this is when the grid is lost in the uninterruptible power supply. It can be seen that the IGBT or FET of the high-speed switching unit determines the reliability of the entire system, and such power semiconductors essentially require a cooling device to dissipate heat generated during power conversion of the IGBT or FET device. Because in general, the allowable temperature of these power semiconductors is about 110℃, but in the actual natural cooling state, the high-speed switching that causes the temperature to rise to 175℃ causes a problem that can cause a serious situation depending on the pattern of the surrounding PCB and the state of lead. Therefore, it can be said that cooling is very important.

Therefore, the noise of the uninterruptible power supply is emerging as an important problem in the operation of the equipment, but the heat generated from the switching element must be cooled due to the characteristics of the equipment, so the noise generated by the forced air cooling type cooler through the fan is inevitable, and AC current is used. Due to the nature of the uninterruptible power supply, there is no way to reduce the noise to less than 60~65db due to the superimposition of the noise from the transformer and coils and the noise from the fan/motor.

A large-capacity uninterruptible power supply (UPS) that generates a lot of heat uses a forced air cooling method to maintain the proper temperature of semiconductor elements in the power system, and is generally cooled by driving a fan on an aluminum heat sink. The forced air cooling causes an increase in audible noise (noise), and the internal temperature is continuously maintained at a high temperature, thereby reducing the lifespan of semiconductor devices and reducing the efficiency.

In such a high temperature state, the hysteresis property, which is one of the characteristics of components using semiconductors and electronic devices, is affected, resulting in shortening the average failure time of each component, thereby reducing the reliability of the uninterruptible power supply. there was.

In order to solve this problem, there is a bar proposed in Publication No. 10-2019-0122697 entitled'Air-cooled and water-cooled combined online UPS system', but as described in the drawings of the specification, the invention is' The following components of the UPS system are arranged in the machine cabinet: an AC/DC converter having an output side connected to a DC voltage intermediate circuit; A DC/AC converter having a power output terminal and a filter inductor and having an input side connected to a DC voltage intermediate circuit; A motor/generator electrically connected to a DC voltage intermediate circuit and a flywheel connected to the rotor; A bypass for serial connection with a DC/AC converter and an AC/DC converter in which a bypass switch is disposed; A controller for the AC/DC converter, DC/AC converter, and bypass switch; A fan that sucks air from the surroundings through an air filter and blows the air in the machine cabinet through a heat exchanger and discharges the air again.The heat exchanger is a cooling water pump, a heat sink for the output stage, and a stator of the motor/generator. It has a configuration that is arranged in a cooling water circuit with a cooling water channel including an extended stator channel.

Since all the components of the UPS system are arranged in the cooling water circuit along with the cooling water channel, the cooling efficiency may be good, but the idea of water flowing through each electric element that is sensitive to water and receives negative effects Is negatively present to electricians, and if even one of the components of the UPS system leaks, it reacts sensitively to water and affects each component of the UPS system where damage must occur. As the UPS system must be stopped, the purpose of the uninterruptible power supply cannot be achieved, and the cooling water circuit used with such a cooling water channel has a physical endurance of each hose used, so a phenomenon such as water leakage may occur in the hose. There is a lot of concern, and since all the components of the UPS system are arranged in the cooling water circuit along with the cooling water channel, the manufacturing cost becomes expensive and the general company cannot purchase it because it has to keep perfect airtightness in many parts. There was this.

Publication No. 10-2019-0122697

An object of the present invention is to solve this problem, and cooling efficiency by selectively applying the cooling method of the IGBT or FET switching element of the switching part of the inverter part, which is the maximum heat generation part of the uninterruptible power supply, the water cooling method or the combined air cooling method. The reason for this is that it is possible because the liquid has a much higher thermal conductivity than the gas. The conductivity of water in the liquid is 30 times that of air, and the energy for heating water is dependent on the energy/calorie for heating air. As it uses the fact that it has 4 times the heat capacity, the maximum heating part of the uninterruptible power supply IGBT or the cooling method of the FET switching element makes the water-cooled cooling part selectively available, and by applying this cooling method, the noise is 60~ It is to provide a low-noise uninterruptible power supply device capable of selectively using a water-cooled cooling method or a combined air-cooled cooling method that can be reduced to less than a specific decibel of 65DB or less audible noise, and a cooling method of the inverter unit of the uninterruptible power supply device.

The object of the present invention is a transformer that receives commercial AC power and lowers it to an appropriate voltage to charge electrical energy in a battery, a rectifier that converts AC output from the transformer into DC, and charges the DC output from the rectifier. The battery discharges during a power outage, the inverter part converts and boosts the battery power to AC when the commercial power fails, and the UPS output terminal is connected to the commercial power when the commercial power is normal. In the uninterruptible power supply device comprising a switching switch for connecting to the UPS output terminal, the inverter unit of the uninterruptible power supply unit, a switching unit for converting direct current supplied from the battery to alternating current, and heat dissipation from the switching unit Thus, the cooling unit according to the present invention in which the cooling unit can be selectively operated in the water cooling unit and the combined air cooling unit is achieved by a low noise uninterruptible power supply that can be selectively used.

The object of the present invention is to maintain cooling of the switching unit of the inverter unit to a temperature of 40° C. or less by the water cooling unit during normal operation, and the cooling temperature of the switching unit of the water cooling unit, the cooling fan speed, the flow rate of cooling water, and leakage of the cooling unit. Monitoring the water cooling unit, and detecting the temperature of the switching unit of the inverter unit when the temperature of the inverter unit exceeds 60°C when the water cooling unit is abnormal or malfunctioning, and operating the complex air-cooled cooling unit; and operating the air-cooled cooling unit to reduce the temperature of the switching unit by 60 Inverter of the uninterruptible power supply device according to the present invention, comprising cooling to below °C and maintaining cooling of the switching unit of the inverter unit to a temperature of 40 °C or less by the water cooling cooling section when the water cooling cooling section returns to the normal state. It is achieved by a negative cooling method.

A low-noise uninterruptible power supply that can be selectively used by a water-cooled cooling unit according to the present invention and a cooling method of the inverter unit of the uninterruptible power supply unit include a switching unit for converting the direct current supplied from the battery to AC, and a switching unit generated by the switching unit. It includes a cooling unit that cools by radiating heat, and the cooling unit has a structure that can be selectively operated in a water cooling type cooling unit and a combined air cooling type cooling unit, so that the cooling method of the IGBT switching element of the switching unit, which is the maximum heat generation unit, is a water cooling method or a combined air cooling type Cooling efficiency is high by selectively applying a cooling method, and by applying such an efficient cooling method, there is an excellent effect that it is possible to reduce the noise to less than audible noise less than a specific decibel of 60 to 65 DB.

1 is a block diagram of a low-noise uninterruptible power supply device according to a first embodiment of the present invention
2A and 2B are schematic block diagrams and partial longitudinal sectional views in which the cooling unit according to the first embodiment is installed installed in the inverter unit of the uninterruptible power supply device according to the first embodiment of the present invention.
3A and 3B are front and cross-sectional views of the cooling unit according to the first embodiment shown in FIG. 2.
4A, 4B and 4C are front, plan and longitudinal sectional views of a cooling block of a cooling unit according to a second embodiment of the present invention.
5 is a view showing a left side view and a rear view of a cooling unit according to a third embodiment of the present invention
6 is a front view of the LED display unit of the cooling unit according to the first embodiment of the present invention
7 is a schematic cross-sectional view of the use of the cooling unit according to the first embodiment installed in the inverter unit of the uninterruptible power supply according to the first embodiment of the present invention in a full load state
8 is a schematic cross-sectional view of use in a state in which the water-cooled cooling kit on one side of the cooling unit according to the first embodiment installed in the inverter unit of the uninterruptible power supply device according to the first embodiment of the present invention is removed at a low load state
9 is an exploded perspective photo of a coupling port for hermetically coupling the cooling water inlet and outlet of the cooling unit according to the present invention
10 is a flow chart for executing the cooling method of the inverter unit according to the present invention

1 is a block diagram for explaining the configuration of a low-noise uninterruptible power supply device that can be selectively used by a water-cooled cooling unit according to the present invention, wherein the uninterruptible power supply (A) receives commercial AC power and charges electrical energy to a battery. In order to reduce the voltage to an appropriate voltage, a rectifier 12 that converts the AC output from the transformer 11 to DC, and a battery 13 that charges the DC output from the rectifier 12 and discharges it in case of a power failure. , Inverter 14 converts and boosts battery power to AC when the commercial power fails, and the UPS output terminal is connected to the commercial power when the commercial power is normal, and the output of the inverter 14 is UPS Including a changeover switch 15 connected to the output terminal, and explaining the operation of the conventional uninterruptible power supply configured as described above, when the commercial power is normal, the commercial power is directly connected to the UPS output terminal through the changeover switch 15 At the same time, the voltage is dropped by the transformer 11 and rectified through the rectifying unit 12 to be charged in the battery 13, and when the commercial power is cut off, the power of the battery 13 is converted to AC by the inverter 14. It is boosted by a transformer (not shown) and connected to the UPS output terminal through a changeover switch 15, and is operated in such a way that power is supplied even during a power outage.

As shown in FIG. 1, the inverter 14 includes a switching unit 141 that converts direct current supplied from the battery 13 to alternating current, and a water cooling type that cools by radiating heat generated from the switching unit 141. It includes a cooling unit 142, and a control unit 143 for controlling the overall operation of the switching unit 141 and the water-cooled cooling unit 142.

The control unit 143 is described as being installed independently of the cooling unit 142, but is not limited thereto, and of course, it may be installed inside the cooling unit 142 if necessary. will be.

For the power conversion element (IGBT) used in the switching unit 141 or the switching unit 141 using the known elements, a detailed description will be omitted.

2A is a block diagram for explaining the configuration of a low-noise uninterruptible power supply that can be selectively used by a water-cooled cooling unit according to the first embodiment of the present invention. Each of the block blocks may have different positions as needed for convenience.

The water-cooled cooling unit 142 according to the first embodiment of the present invention includes two water-cooled cooling units 1420 and 1421 of a cooling block 1420 and a cooling kit 1421, as shown in FIG. 3. And the water-cooled cooling unit 142 is in close contact with the switching unit 141.

The cooling block 1420 has an attachment surface 1420a to which the switching element 141a of the switching unit 141 is attached, as shown in FIGS. 3A and 3B, and the cooling water is filled therein. A cooling water space 1420b for cooling the heat generated by the switching element 141a is formed, and a cooling water outlet 1420c through which the cooling water flows in and out is formed on one surface, and is formed of an aluminum material having excellent heat transfer rate. It will be said that it can be used as a material.

The cooling water space 1420b formed inside the cooling block 1420 is formed in a zigzag shape in a form in which the piping of the boiler is arranged in this embodiment, but is not limited thereto, and a box-shaped space or other forms Of course, it will be said that the space of can be formed.

As shown in FIGS. 3A and 3B, the cooling kit 1421 has a cooling water space 1421b filled with cooling water to cool heat generated by the switching device 141a, and the cooling water The cooling water outlet 1421c through which the coolant flows in and out is formed, and an LED display unit 1421d that displays the temperature of the coolant is installed on the side thereof, and the cooling kit 1421 is formed of an aluminum material having excellent heat transfer rate. It will be said that it can be used as a metal material.

The cooling water space 1421b formed inside the cooling kit 1421 is formed in a zigzag shape in a form in which the piping of the boiler is arranged in this embodiment, but is not limited thereto, and a box-shaped space or other forms Of course, it will be said that the space of can be formed.

Since the cooling block 1420 and the cooling water outlet ports 1420c and 1421c of the cooling kit 1421 have a structure that can be connected by a pipe hose 18, effective cooling is possible when using a full load. will be. In addition, when using under a low load, the pipe hose 18 is separated and the cooling kit 1421 is separated to leave only the cooling block 1420 and the cooling fan 17 is rotated to cool the cooling block 1420. It could be. Alternatively, there may be a method of separating the cooling block 1420, leaving only the cooling kit 1421, and rotating the cooling fan 17. In addition, in another way, as shown in Fig. 5, the cooling block 1420 is disposed to be spaced apart from the cooling block 1420, the hose pipe 18 to the cooling radiator 1422 used in the third embodiment to be described later. ) Can also be used.

The cooling unit 142 according to the second embodiment of the present invention is composed of only the cooling block 1420, as shown in FIGS. 4A, 4B, and 4C, and the cooling block 1420 has a switching unit ( An attachment surface 1420a to which the switching element 141a of 141 is attached is formed, and a cooling water space 1420b is formed in which cooling water is filled to cool the heat generated by the switching element 141a, and the A pipe 1424 connected to the cooling water outlet 1420c of the cooling block 1420 and a pipe 1424 connected to the cooling water outlet 1420c of the cooling block 1420, and connected to the end of the pipe 1424 And a cooling unit 1425 installed outside or in a remotely spaced place for cooling the hot cooling water flowing out through the pipe 1424. The cooling unit 1425 may be a cooling unit provided with a cooling fan 1426 to cool the heated cooling water.

As described above, the cooling block 1420 of the cooling unit 142 according to the second embodiment is easily cooled because the switching unit 141 heated by the switching element 141a is cooled by the cooling block 1420. In this way, the cooling water cooled by the cooling water and heat exchanged with the switching element 141a is cooled by the cooling fan 1426 of the cooling unit 1425 far away, and the cooling block is cooled again in this way. Since it flows into 1420, the cooling of the switching unit 141 is highly efficient, and since the cooling unit 1425 is far from the outside of the building or from the workers, no noise is generated or only a small audible noise is generated.

In the cooling unit 142 according to the third embodiment of the present invention, as shown in FIG. 5, cooling water is filled therein to cool the heat generated by the switching element 141a. A cooling block 1420 having a cooling water space 1420b for cooling the heat generated by the switching element 141a and having a cooling water outlet 1420c through which the cooling water flows in and out; A cooling water space 1422b into which the cooling water heated by the cooling block 1420 flows is formed, a built-in pump 1422d is installed in the cooling water space 1422b, and a cooling water outlet through which the cooling water flows and flows on one side A cooling radiator 1422 made of a metal material on which (1422c) is formed; A cooling fan 1422e having a plurality of units attached to one surface of the cooling radiator 1422, and a display unit 1422f installed on one surface of the cooling fan 1422e, the cooling block 1420 and the cooling radiator ( 1422) is connected by a pipe hose 18.

A temperature sensor 1422h for sensing the temperature of the cooling block 1420 is installed on the outer surface of the cooling block 1420 so that the detected temperature is transmitted to the controller 143 in real time.

In the present embodiment, a cooling fan 1422 e is installed on one surface of the cooling radiator 1422, and is directly filled into the cooling radiator 1422 to blow air to the heated cooling water. ), it is possible to cool the cooling water more efficiently by using water cooling and air cooling in combination.

The built-in pump 1422d installed in the cooling radiator 1422 recognizes the temperature of the switching unit 141 and the speed of the cooling fan 1422e in the control unit 143, and recognizes that it has been heated outside the proper temperature of the cooling water. And it is to increase the cooling efficiency by circulating the cooling water filled in the cooling water space (1422b) more quickly. The cooling radiator 1422 and the cooling block 1420 are provided with a plurality of temperature sensors 1422h for sensing the temperature of the cooling water to transmit the detected temperature of the cooling water to the control unit 143 in real time, and the transmitted temperature is displayed on the display unit. Each temperature sensor 1422h is displayed in plural according to the corresponding position on the 1422f.

A handle 1422i is installed outside the cooling radiator 1422 to be separated from the cooling block 1420 so that the cooling unit 142 according to the third embodiment can be attached and detached only when a large amount of cooling is required. It is possible to install in the inverter unit 14 of the uninterruptible power supply (A).

The cooling unit 142 according to the first embodiment of the present invention adopts a modular method in which the cooling block 1420 and the cooling kit 1421 are installed in parallel, as shown in FIG. 7. Depending on the operating environment, the cooling block 1420 and the cooling kit 1421 are used at the same time, or the cooling kit 1421 is separated and only the cooling block 1420 is used, or, conversely, the cooling kit 1421 except for the cooling block 1420 It is designed so that the use of energy can select an efficient cooling method by using a bay.

That is, in the full load or overload state of the uninterruptible power supply A, the cooling block 1420 of the cooling unit 142 according to the first embodiment and the cooling kit 1421 are connected as shown in FIG. 7. When the water-cooling method is adopted in series to operate, and when a low load or heat saturation state of the heat source is low, as shown in FIG. 8, the cooling kit 1421 of the cooling unit 142 is removed, and the first embodiment It is designed to select only the cooling block 1420 of the cooling unit 142 according to the following, and to select a complex cooling method of cooling by blowing with the cooling fan 17 installed at the rear.

Specifically, in the case of FIG. 7 in a full load or overload state, the cooling block 1420 of the cooling unit 142 according to the first embodiment and the cooling kit 1421 are connected to operate. In series, the conventional cooling fans 17 installed in parallel are processed so that they are not operated by adopting a series-type water-cooling method and cooling by using a series-type water cooling method. This cooling method operates the two cooling blocks 1420 and the cooling kit 1421 at the same time, so even if a lot of power conversion heat is radiated, such a large amount of heat is reduced to the cooling water space of the two cooling blocks 1420 and the cooling kit 1421. Since the cooling water stored in (1420b) (1421b) absorbs all, the amount of heat dissipation can be easily absorbed under full load or overload.

When the heat saturation state of the heat source is low in the case shown in FIG. 8, the cooling kit 1421 of the cooling unit 142 according to the first embodiment is removed, only the cooling block 1420 is selected, and the cooling fan 17 ) Is activated in the cooling block 1420 to operate the water-cooled cooling fan 17 in a forced air cooling complex cooling method.

The first, second, and third embodiments of the present invention are all the same, but the cooling unit 142 according to the first embodiment is described, for example, the cooling water outlet 1420c of the cooling unit 142 ) (1421c) (1422c) is formed of a metal cooling block (1420) and the pipe (1424) is connected, as shown in Figure 9, one end is inserted into the pipe (1424) the pipe insertion end 161 ) Is formed and the other end of the cooling water outlet (1420c) (1421c) (1422c), the coupling end (162) is formed to be screwed to the coupling port 16 is proposed.

A check valve (not shown) is installed inside the coupling hole 16, so that the check valve flows through the cooling water inside the coupling hole 16 even when the pipe 1424 is separated. Not) is blocked, so that the outflow of cooling water is basically blocked, and the coupling port 16 is used to attach to the cooling unit 142 that is distributed in the market.

The other end of the pipe 1424 is connected to a cooling unit 1425 installed outside or at a remote location that cools the hot cooling water flowing out through the pipe 1424. In this embodiment, the cooling unit 1425 is equipped with a cooling fan 1426 to cool the hot cooling water that has flowed out through the pipe 1424 by the cooling fan 1426, but other methods may be used. .

Calculation of the maximum calorific value of the inverter unit 14 of the low-noise uninterruptible power supply (A) that can be selectively used by the water-cooled cooling unit according to the present invention is, output capacity X output power factor X [(1-total efficiency)/total efficiency] X 1KWH It can be converted into per calorific value, and when the output capacity of the uninterruptible power supply (A) is 5KVA, the maximum calorific value is 968 Kcal/hour.

When this is converted into wattage, it is about 1130W maximum per hour, so when considering the cooling of the inverter, which is the heat saturation concentrator, it can be said that it is appropriate to use a cooling unit with an average of 600 ~ 800 Wh.

The operation of the low-noise uninterruptible power supply (A) which can be selectively used by the water-cooled cooling unit according to the present invention having such a configuration will be described in detail below.

During normal operation of the low-noise uninterruptible power supply (A) according to the present invention, the water-cooled cooling unit 142 maintains the cooling of the switching unit 141 of the inverter unit to a temperature of 40°C or less, and the water-cooled cooling unit 142 The cooling temperature of the switching unit 141, the cooling fan speed, the flow rate of the cooling water, and the leakage of the cooling unit are monitored through an LED digital panel (not shown), and generated when the water cooling type cooling unit 141 is abnormal or malfunctions. When the temperature of the switching unit 141 of the inverter unit 14 exceeds 60°C, the temperature of the switching unit 141 is lowered to 60°C or less by detecting it and operating the complex air-cooled cooling unit. It cools and continues to operate for a certain period of time, and when the water-cooled cooling unit 142 returns to the normal state through repair or maintenance, the switching unit 141 of the inverter unit 14 is returned to the water-cooled cooling unit 142. It is operated in a manner that maintains cooling below a temperature of 40°C, and the overall operation for this operation is entirely controlled by the control unit 143 installed in the inverter unit 14. In one control method, the control unit 143 may be performed in a method of controlling an input of a gate of the switching unit 141 included in the inverter unit 14.

That is, the cooling method of the inverter part of the low-noise uninterruptible power supply (A) in which the water-cooled cooling part can be selectively used according to the present invention is a water-cooled cooling part during normal operation to cool the switching part of the inverter part to a temperature of 40°C or less (first set temperature). And monitoring the cooling temperature of the switching part of the water-cooled cooling part, the cooling fan speed, the flow rate of the cooling water, and the leakage of the cooling part, and the temperature of the switching part of the inverter part at the time of an abnormality or failure of the water-cooled cooling part is 60°C ( When the second set temperature) is exceeded, the air-cooled cooling unit is operated, the air-cooled cooling unit is operated to cool the temperature of the switching unit to 60 °C (second set temperature) or less, and the water-cooled cooling unit is normal. At the time of returning to the state, it includes the step of maintaining the cooling of the switching unit of the inverter unit to a temperature of 40° C. or less (the first set temperature) by the water cooling type cooling unit again.

When the operation of the low-noise uninterruptible power supply (A) according to the present invention is described with reference to FIG. 10, it is started to be turned on, and a temperature set value is input, as an embodiment, the default setting is set to 55°C. And the setting range can be set to 32~99℃. After entering the temperature setting value, the cooling unit 142 is operated and the temperature of the cooling water circulated in the cooling unit 142 is sensed, and when the temperature of the cooling water is lower than the set temperature, it is detected by referring to the set parameter. Operate the fan and motor power appropriate to the temperature. For example, if the cooling water temperature is 35℃ or less, the cooling fan is operated 20%, if the cooling water temperature is 37℃ or less, the cooling fan is operated 24%, 39℃ 28%, 41℃ 36%, 43℃ 44%, 45℃ 52 %, 47℃ 64%, 49℃ 76%, 51℃ 88%, and below 99℃, 100% of the cooling fan is operated.

When the temperature of the coolant is higher than the set value, visible information such as an alarm sound is sent to the operator, and the fan and motor are operated at 100% by operating in the rapid cooling mode, and the coolant temperature is detected again, and the coolant is set to the set temperature. It is judged whether it exceeds 3℃, and if not, it returns to the self-diagnosis process to continue operation. In other cases, it transmits visible information such as an alarm sound to the operator and a stop signal.

The thermal saturation state of the low-noise uninterruptible power supply (A) according to the present invention was measured by the water-cooling method, and it was found that the temperature of the solvent for water-cooling cooling and the Delta T of the heat saturation area (heat source) are 5℃ or less, which is ideal for heat transfer. It could be confirmed that it was an efficient cooling method, and the maximum temperature of the switching part, which is a heat source, could be controlled below 82℃.

At this time, the difference in temperature from the composite air-cooled method is 40℃.

In addition, as a result of checking the average value of the PCB temperature around the heat source of the switching unit 141 of the inverter unit 14, it was confirmed that it was 45°C, which did not cause thermal damage to the lead state and semiconductors around the heat source mentioned above.

In addition, due to the characteristics of the uninterruptible power supply (A) operating in a closed space, audible noise less than a specific decibel is enforced as a standard (public standard: 65dB), so the water-cooled cooling method is used as an uninterruptible power supply. Applying to (A), a method to attenuate more than 25% of audible noise is additionally described. This is a method of maximizing the user's operational convenience in a user environment that is operated in-house according to equipment and floor area that are minimized by the development of technology.

In general, when measuring the audible noise at each 1m of the front and rear of the uninterruptible power supply, it is forced to be less than 65dB. At this time, as a result of measuring the audible noise by operating the water-cooled cooling unit of the uninterruptible power supply device of the present invention, it was measured as shown in the table below for each power consumption.

Audible noise measurement by power consumption Power Consumption Audible noise measurement Maximum attenuation rate maximum Ieast 440W 44dB 32dB 49.2% 750W 45dB 33dB 49.3% 1450W 61dB 30dB 53.8% 2000W 63dB 30dB 53.8% 4500W 71 dB 49dB 24.6%

In other words, the results and effects of the above efforts to attenuate audible noise can be referred to for comparative analysis through comparison with the matters related to the [Noise and Vibration Management Act] living noise regulation (see below) that are limited in Korea. In the uninterruptible power supply to be installed, it can be determined that 60dB~65dB is a noise regulation that manages the maximum upper limit, and the noise attenuation test result is a minimum of 42dB and a maximum of 48.9dB, and the difference between the results of application before and after the present invention is 10-20dB. It can be implemented within.

The difference in decibels is 10-20dB as a simple numerical value, but through an understanding of the decibel unit using a log function (unit of sound intensity. When the threshold of sound at a certain frequency is Po, the sound of intensity P is log/ It is expressed as a P/Po bell, which means that the audible noise is reduced to about 1/10 to 1/100 of a decibel (=101og (P/Po)), using 1/10 of it as a unit.

◆ Article 21 (2) of the 「Noise and Vibration Control Act」, regulation 「Enforcement Rule of the 「Noise and Vibration Control Act」 Article 20 (3) and attached Table 8).
Target area
Noise sources by time Morning and evening weekly Nighttime (05:00~07:00,
18:00~22:00) (07:00~18:00) (22:00~05:00) 1. Residential area
2. Green area
3. Among the management areas, village districts and official recreational development promotion districts
4. Natural environment conservation area
5. Schools, general hospitals, and public libraries in other areas loud speaker Outdoor installation 60 or less 65 or less 60 or less When noise comes from indoors to outdoors 50 or less 55 or less 45 or less factory 50 or less 55 or less 45 or less Workplace Same building 45 or less 50 or less 40 or less Etc 50 or less 55 or less 45 or less Construction site 60 or less 65 or less 50 or less

Meanwhile, referring to the decibels specified in Article 21 (2) of the 「Noise and Vibration Control Act」 and Article 20 (3) of the Regulation 「Enforcement Rule of the Noise and Vibration Control Act」 and attached Table 8), the company's existing products and The table below shows the temperature change of the heating element by capacity of the low-noise uninterruptible power supply and the measured value of the audible noise.

◆ Comparison of measurement of temperature change and audible noise of the heating element of our existing product and the power supply device of the present invention

In addition, when the water-cooled cooling method as above is adopted, the cost increases from the user's side, so it is modularized so that it can be optimized for various operating environments and can be used selectively (removing and installing), promoting user convenience and air conditioning according to the operating environment. A design that can be physically linked to an outdoor unit to install a noisy cooling unit outdoors is applied.

The low-noise uninterruptible power supply device in which the water-cooled cooling unit according to the present invention can be selectively used and the cooling method of the inverter unit of the uninterruptible power supply device are capable of repeatedly manufacturing the same product in the uninterruptible power supply manufacturing industry It will be said that it is possible, so it will be said that it is an invention with industrial applicability.

A: Uninterruptible power supply 11: Transformer
12: rectifier 13: battery
14: inverter 15: changeover switch
141: switching unit 142: water-cooled cooling unit
143: control unit

Claims (8)

In the low-noise uninterruptible power supply in which a water-cooled cooling unit can be optionally used,
The uninterruptible power supply includes a transformer 11 that receives commercial AC power and lowers it to an appropriate voltage to charge electrical energy in a battery, a rectifier 12 that converts AC output from the transformer 11 into DC, and a rectifier. The battery 13 that charges the DC output from (12) and discharges it in case of a power failure, the inverter 14 that converts the battery power to AC and boosts it when the commercial power fails, and the UPS output terminal when the commercial power is normal. It is connected to the commercial power, and includes a switching switch 15 for connecting the output of the inverter 14 to the UPS output terminal when the commercial power is out of power,
The inverter 14 includes a switching unit 141 that converts direct current supplied from the battery 13 into alternating current, a water-cooled cooling unit 142 that radiates heat generated from the switching unit 141 to cool it, and the Including a control unit 143 for controlling the overall operation of the switching unit 141 and the water-cooled cooling unit 142,
The water-cooled cooling unit 142 includes two water-cooled cooling units, a cooling block 1420 and a cooling kit 1421,
The cooling block 1420 has an attachment surface 1420a on which the switching element 141a of the switching unit 141 is attached, and is filled with coolant to generate heat generated by the switching element 141a. A cooling water space (1420b) for cooling the cooling water is formed, and the cooling water outlet (1420c) through which the cooling water flows in and out is formed on one surface of a metal material,
The cooling kit 1421 includes a cooling water space 1421b that is filled with cooling water to cool heat generated by the switching element 141a, and a cooling water outlet 1421c through which the cooling water flows in and out. ) Is formed and an LED display unit 1421d is installed on the side thereof to display the temperature of the cooling water, and the cooling kit 1421 is formed of a metal material. .
delete The method of claim 1,
Each cooling water outlet (1420c) (1421c) of the cooling block (1420) and the cooling kit (1421) are connected by a pipe hose (18),
The pipe hose 18 is separated and the cooling kit 1421 is separated to leave only the cooling block 1420 or only the cooling kit 1421 to rotate and cool the cooling fan 17. A low-noise uninterruptible power supply that can optionally be used with a water-cooled cooling unit.
The method of claim 1,
The cooling block 1420 may include a pipe 1424 connected to the cooling water outlet port 1420c, and an external or external cooling water that is connected to an end of the pipe 1424 and cools the heated cooling water flowing out through the pipe 1424. Including a cooling unit (1425) installed in a far spaced place,
The cooling unit 1425 is a low-noise uninterruptible power supply capable of selectively using a water-cooled cooling unit, characterized in that a cooling fan (1426) is provided to cool the heated cooling water.
The method of claim 1,
The cooling unit 142 is filled with coolant therein to form a cooling water space 1422b for cooling heat generated by the switching element 141a, and a built-in pump 1422d inside the cooling water space 1422b. A cooling radiator 1422 made of a metal material having a cooling water outlet 1422c through which the cooling water flows in and out on one side, and a cooling fan 1422e having a plurality on one surface of the cooling radiator 1422, and the A low-noise uninterruptible power supply capable of selectively using a water-cooled cooling unit, characterized in that it includes a display unit (1422f) installed on one side of the cooling fan (1422e) is installed.
The method of claim 5,
The built-in pump 1422d installed in the cooling radiator 1422 recognizes the temperature of the switching unit 141 and the speed of the cooling fan 1422e in the control unit, recognizes that it has been heated outside the proper temperature of the cooling water, It is operated to increase the cooling efficiency by circulating the cooling water filled in (1422b) more quickly,
The cooling radiator 1422 is equipped with a temperature sensor 1422h for sensing the temperature of the cooling water to transmit the detected temperature of the cooling water to the control unit in real time.
delete In the cooling method of the inverter part of the low-noise uninterruptible power supply (A) in which a water-cooled cooling part is selectively available,
The cooling method of the inverter unit of the low-noise uninterruptible power supply (A) includes the steps of maintaining the cooling of the switching unit of the inverter unit to a first set temperature or less by a water cooling type cooling unit during normal operation,
Monitoring the cooling temperature of the switching part of the water-cooled cooling part, the cooling fan speed, the flow rate of the cooling water, and the leakage of the cooling part,
The step of operating the air-cooled cooling unit by sensing when the temperature of the switching unit of the inverter unit in the event of an abnormality or failure of the water-cooled cooling unit exceeds a second set temperature,
Cooling the switching unit to a temperature below a second set temperature by operating the air-cooled cooling unit; and
A water-cooled cooling unit, characterized in that it comprises the step of maintaining the cooling of the switching unit of the inverter unit to a first set temperature or less when the water-cooled cooling unit returns to a normal state after being repaired. Cooling method of the inverter part of the low-noise uninterruptible power supply (A).

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