Uninterruptible power supply device

Abstract

The first base and the second base (21) are disposed so as to face each other. The inverter (23) is attached to either the first base or the second base (21). The converter (24) is attached to the first base (21a). The chopper (25) is attached to the second base (21b). At least a portion of the fins (22) thermally connected to the converter (24) via the first susceptor (21a) is thermally connected to the chopper (25) via the second susceptor (21b).

Description

Technical Field

[0001] The present disclosure relates to an uninterruptible power supply device. Background Art

[0002] The following structure is widely used in the power conversion device of the uninterruptible power supply device, which includes: a converter, which converts the AC power supplied from the AC power supply into DC power and stops when the AC power supply fails; a chopper, which adjusts the voltage of the DC power supplied from the power storage device when the AC power supply fails; and an inverter, which converts the DC power output by the converter or the DC power output by the power storage device into AC power and supplies power to the load.

[0003] In the power conversion device, the converter and the inverter operate normally when AC power is normally supplied from the AC power source, and the chopper and the inverter operate to continue power supply during a power outage when the AC power supply from the AC power source is stopped.

[0004] In addition, sometimes the structure is such that the converter, inverter and chopper are mounted on one surface of a heat sink, and fins are provided on the other surface of the heat sink so that air from a cooling fan blows onto the fins to dissipate heat from the converter, inverter and chopper. In this structure, there are fins that are not used for heat dissipation in either normal power supply or power failure, resulting in a cooling structure with low fin utilization.

[0005] As a method of improving the utilization rate of fins, there is a heat sink described in Japanese Patent Application Laid-Open No. 2012-182159 (Patent Document 1), for example. The heat sink described in Patent Document 1 is provided with a heat pipe. As a result, heat is diffused throughout the fins, thereby achieving a heat sink with high heat dissipation performance.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2012-182159 Summary of the invention

[0009] Problems that the invention will solve

[0010] If a heat sink provided with a heat pipe or a heat sink using a heat diffusion material as described above is used, the heat can be diffused to the entire fin. However, when a heat pipe or a heat diffusion material is used, the cost of the device will be high.

[0011] The present disclosure has been made to solve the above-mentioned problems, and provides an uninterruptible power supply device that can achieve cost reduction and miniaturization of the device and improve cooling efficiency.

[0012] Means for solving problems

[0013] The uninterruptible power supply device disclosed in the present invention is a device connected between an AC power supply and a load. The uninterruptible power supply device includes a heat sink and a power conversion device. The heat sink includes a first base, a second base and a fin. The first base and the second base are arranged opposite to each other. The fin is arranged between the first base and the second base and is connected to both the first base and the second base. The power conversion device is installed on the surface opposite to the surface connected to the fin in each of the first base and the second base. The power conversion device includes a converter, a chopper, and an inverter. The converter converts the AC power supplied to the AC power supply into DC power and stops when the AC power supply fails. The chopper adjusts the voltage of the DC power supplied from the power storage device when the AC power supply fails. The inverter converts the DC power output by the converter or the DC power output by the power storage device into AC power and supplies power to the load. The inverter is installed on one of the first base and the second base. The converter is installed on the first base. The chopper is installed on the second base. At least a portion of the fin thermally connected to the converter via the first base is thermally connected to the chopper via the second base.

[0014] Effects of the Invention

[0015] According to the present disclosure, an uninterruptible power supply device that can achieve cost reduction and size reduction of the device and improve cooling efficiency can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a diagram for explaining the circuit configuration of an uninterruptible power supply device.

[0017] Figure 2 This is a diagram for explaining the circuit configuration of an uninterruptible power supply device.

[0018] Figure 3 It is a top view of a conventional heat sink and a power conversion device.

[0019] Figure 4 yes Figure 3 A front view of the heat sink and the power conversion device is shown.

[0020] Figure 5 yes Figure 3 A front view of the heat sink and the power conversion device is shown.

[0021] Figure 6 It is a plan view of the heat sink and the power conversion device according to the present embodiment.

[0022] Figure 7 yes Figure 6 A bottom view of the heat sink and power conversion device is shown.

[0023] Figure 8 yes Figure 6 A front view of the heat sink and the power conversion device is shown.

[0024] Fig. 9 yes Figure 6 A front view of the heat sink and the power conversion device is shown.

[0025] Fig.10 It is a front view of a heat sink and a power conversion device according to Modification 1.

[0026] Fig.11 It is a front view of a heat sink and a power conversion device according to Modification 2. DETAILED DESCRIPTION

[0027] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, in the following, the same reference numerals are attached to the same or corresponding parts in the drawings, and the description thereof will not be repeated in principle.

[0028] Figure 1 , Figure 2 1 is a diagram for explaining the circuit configuration of the uninterruptible power supply device 1. The uninterruptible power supply device 1 is a device connected between a commercial AC power supply 31 and a load 32. The uninterruptible power supply device 1 temporarily converts three-phase AC power from the commercial AC power supply 31 into DC power, converts the DC power into three-phase AC power, and supplies the DC power to the load 32.

[0029] Uninterruptible power supply device 1 includes power conversion device 20, bypass circuit (semiconductor switch) 35, and control device 30. Power conversion device 20 includes converter 24, chopper 25, and inverter 23.

[0030] The converter 24 converts the AC power supplied from the commercial AC power source 31 into DC power. The converter 24 stops when the commercial AC power source 31 fails. The chopper 25 adjusts the voltage of the DC power supplied from the power storage device (hereinafter also referred to as "battery") 33 when the commercial AC power source 31 fails. The inverter 23 converts the DC power output from the converter 24 or the DC power output from the battery 33 into AC power and supplies the power to the load 32.

[0031] The converter 24, the chopper 25, and the inverter 23 each include an IGBT (Insulated Gate Bipolar Transistor) and a diode. The IGBT constitutes a "switching element."

[0032] In this embodiment, the uninterruptible power supply device 1 performs inverter power supply, battery power supply or bypass power supply. When the inverter power supply is performed, the converter 24 converts the AC power supplied from the commercial AC power supply 31 into DC power, and the inverter 23 converts the DC power into AC power and supplies it to the load 32.

[0033] In bypass power supply, the AC power supplied from the commercial AC power source 31 is supplied to the load 32 via the semiconductor switch 35, that is, without passing through the converter 24 and the inverter 23. In battery power supply, the voltage of the DC power supplied from the battery 33 is adjusted by the chopper 25, and the DC power is converted into AC power by the inverter 23 and supplied to the load 32.

[0034] The uninterruptible power supply device 1 further includes an AC input terminal T1, an AC output terminal T2, a battery terminal T3, and electromagnetic contactors 36 to 38. The AC input terminal T1 receives AC power of a commercial frequency from a commercial AC power supply 31. The AC output terminal T2 is connected to a load 32. The load 32 is driven by the AC power. The battery terminal T3 is connected to a battery 33. The battery 33 stores DC power.

[0035] Electromagnetic contactor 36 is connected between AC input terminal T1 and an input node of converter 24. Electromagnetic contactor 36 is turned on when uninterruptible power supply device 1 is used, and is turned off when uninterruptible power supply device 1 is maintained, for example.

[0036] The converter 24 is controlled by the control device 30, and when AC power is normally supplied from the commercial AC power source 31 (when the inverter is supplying power), the three-phase AC power is converted into DC power (positive conversion) and output to the DC line L1. When the AC power supply from the commercial AC power source 31 is stopped during a power outage, the operation of the converter 24 is stopped. The output voltage of the converter 24 can be controlled to a desired value.

[0037] The DC line L1 is connected to a high voltage side node of the chopper (bidirectional chopper) 25, and a low voltage side node of the chopper 25 is connected to the battery terminal T3 via an electromagnetic contactor 38. The electromagnetic contactor 38 is turned on when the uninterruptible power supply device 1 is used, and is turned off when the uninterruptible power supply device 1 and the battery 33 are maintained, for example.

[0038] The chopper 25 is controlled by the control device 30. When AC power is normally supplied from the commercial AC power supply 31 (when powered by the inverter), the DC power generated by the converter 24 is stored in the battery 33. When an instantaneous voltage drop or power outage occurs, the DC power of the battery 33 is supplied to the inverter 23 via the DC line L1 (when powered by the battery).

[0039] When the chopper 25 stores DC power in the battery 33, it steps down the DC voltage of the DC line L1 and applies it to the battery 33. When the chopper 25 supplies the DC power of the battery 33 to the inverter 23, it steps up the voltage between the terminals of the battery 33 and outputs it to the DC line L1. The DC line L1 is connected to the input node of the inverter 23.

[0040] The inverter 23 is controlled by the control device 30, and converts (reversely converts) the DC power supplied from the converter 24 or the chopper 25 via the DC line L1 into three-phase AC power of commercial frequency and outputs it. That is, the inverter 23 converts the DC power supplied from the converter 24 via the DC line L1 into three-phase AC power in normal times (when the inverter is supplying power), and converts the DC power supplied from the battery 33 via the chopper 25 into three-phase AC power when the battery is supplying power at the time of instantaneous voltage drop or power failure. The output voltage of the inverter 23 can be controlled to a desired value.

[0041] The inverter 23 is connected to the AC output terminal T2 via an electromagnetic contactor 37. The electromagnetic contactor 37 is controlled by the control device 30, and is turned on when the inverter is powered or the battery is powered, and is turned off when the bypass is powered.

[0042] The semiconductor switch 35 includes a thyristor switch having a pair of thyristors connected in anti-parallel, and is connected between the AC input terminal T1 and the AC output terminal T2. The semiconductor switch 35 is controlled by the control device 30, and is turned off when the inverter is powered or the battery is powered, and is turned on when the bypass is powered. For example, when the inverter 23 fails during inverter power supply, the semiconductor switch 35 is turned on instantaneously, and the three-phase AC power from the commercial AC power supply 31 is supplied to the load 32.

[0043] The control device 30 controls the uninterruptible power supply device 1 as a whole. The control device 30 can be composed of, for example, a microcomputer. As an example, the control device 30 has a built-in memory and a CPU (Central Processing Unit) (not shown), and can perform control actions by executing software processing of a program pre-stored in the memory by the CPU. Alternatively, a part or all of the control action can also be realized by hardware processing using a built-in dedicated electronic circuit instead of software processing.

[0044] The AC input terminal T1 receives a three-phase AC voltage (U-phase AC voltage, V-phase AC voltage, and W-phase AC voltage) from a commercial AC power source 31. A three-phase AC voltage synchronized with the three-phase AC voltage from the commercial AC power source 31 is output to the AC output terminal T2. The load 32 is driven by the three-phase AC voltage from the AC output terminal T2.

[0045] like Figure 1As shown, when the inverter supplies power, the heat dissipated from the converter 24 and the inverter 23 increases due to the operation of the converter 24 and the inverter 23. In addition, the chopper 25 also operates due to the charging of the battery 33, but the heat dissipated from the chopper 25 is much less than the heat dissipated from the converter 24.

[0046] like Figure 2 As shown, when the battery is powered, the chopper 25 and the inverter 23 operate, and the heat dissipated from the chopper 25 and the inverter 23 increases. In this case, since the commercial AC power supply 31 does not supply power, the converter 24 does not operate.

[0047] In this embodiment, the power conversion device 20 is mounted on a radiator. Figure 3 to Figure 5 , a conventional radiator 19 and a power conversion device 10 will be described. Figure 3 It is a plan view of a conventional heat sink 19 and a power conversion device 10 .

[0048] like Figure 3 As shown, the heat sink 19 includes a base 11 . The power conversion device 10 includes an inverter 13 , a converter 14 , and a chopper 15 .

[0049] The inverter 13, converter 14, and chopper 15 of the power conversion device 10 are each composed of a plurality of semiconductor elements (IGBT). In this example, the inverter 13 is provided with four semiconductor elements, the converter 14 is provided with four semiconductor elements, and the chopper 15 is provided with two semiconductor elements, but this is only an example, and each may be composed of any number of semiconductor elements.

[0050] The inverter 13, the converter 14, and the chopper 15 of the power conversion device 10 are mounted on the base 11. Figure 1 The circuit configuration is the same as that of , in which a commercial AC power source 31 , a load 32 , and a battery 33 are connected to the power conversion device 10 .

[0051] Figure 4 , Figure 5 yes Figure 3 The front view of the heat sink 19 and the power conversion device 10 is shown. Figure 4 As shown, the heat sink 19 further includes fins 12. The fins 12 are connected to a surface of the heat sink 19 opposite to a surface on which the base 11 of the power conversion device 10 (inverter 13, converter 14, chopper 15) is mounted.

[0052] The fin 12 includes fins 12a to 12c. The fin 12a is thermally connected to the inverter 13 via the base 11. The fin 12b is thermally connected to the converter 14 via the base 11. The fin 12c is thermally connected to the chopper 15 via the base 11. That is, the heat of the inverter 13 is released from the fin 12a, the heat of the converter 14 is released from the fin 12b, and the heat of the chopper 15 is released from the fin 12c.

[0053] The fins 12 of the heat sink 19 are provided with comb-shaped gaps so as to receive cooling air from a cooling fan (not shown) from the front side (see Figure 3 ) and discharged to the opposite side. The heat sink 19 receives the heat of the semiconductor element by the base 11, and transfers the heat to the fins 12 by individual heat conduction. It has a mechanism for transferring heat from the surface of the fins 12 to the air by heat transfer. The air from the cooling fan is blown to the fins 12 to dissipate the heat of the semiconductor element.

[0054] like Figure 4 As shown, when electric power is supplied from the commercial AC power source 31 (when power is supplied by the inverter), the amount of heat dissipated from the fins 12a and 12b increases due to the operation of the inverter 13 and the converter 14.

[0055] On the other hand, Figure 5 As shown, when electric power is supplied from the battery 33 (battery power supply), the amount of heat dissipated from the fins 12a and 12c increases due to the operation of the inverter 13 and the chopper 15.

[0056] In this way, when the inverter supplies power ( Figure 4 ), the fins 12a and 12b are effectively used for heat dissipation, but the fins 12c are not effectively used. On the other hand, when the battery is powered ( Figure 5 ), the fins 12a and 12c are effectively used for heat dissipation, but the fins 12b are not effectively used.

[0057] In the conventional heat sink 19 and power conversion device 10, the inverter 13, the converter 14 and the chopper 15 are mounted in a row on a base 11. In this device, there are fins that are not used for heat dissipation when the inverter is powered and when the battery is powered, and it can be said that the utilization rate of the fins is low.

[0058] On the other hand, in this embodiment, two bases are provided for mounting the inverter 23, the converter 24, and the chopper 25. The converter 24 is mounted on one base, and the chopper 25 is mounted on the other base at a position facing the converter 24.

[0059] Below, use Figure 6 to Figure 9 , the radiator 29 and the power conversion device 20 of this embodiment will be described. Figure 6 It is a plan view of the heat sink 29 and the power conversion device 20 according to the present embodiment. Figure 7 yes Figure 6 A bottom view of the heat sink 29 and the power conversion device 20 is shown. Figure 8 , Fig. 9 yes Figure 6 A front view of the heat sink 29 and the power conversion device 20 is shown.

[0060] The heat sink 29 includes a base 21 (a base 21a and a base 21b) and fins 22. The inverter 23, the converter 24, and the chopper 25 are mounted on the base 21 (the base 21a and the base 21b).

[0061] like Figure 6 As shown in (top view), a converter 24 is mounted on the base 21a. Figure 7 As shown in the bottom view, the chopper 25 is mounted on the base 21b. The inverter 23 may be mounted on either the base 21a or the base 21b. In the present embodiment, the inverter 23 is mounted on the base 21a.

[0062] and Figure 3 Similarly, the inverter 23, the converter 24 and the chopper 25 are each composed of a plurality of semiconductor elements (IGBT). Figure 6 , Figure 7 The cooling wind direction is shown, and Figure 3 Cooling is performed in the same manner.

[0063] like Figure 8 As shown in the front view, the base 21a and the base 21b are arranged opposite to each other. The fin 22 is arranged between the base 21a and the base 21b, and is connected to both the base 21a and the base 21b. The power conversion device 20 (inverter 23, converter 24 and chopper 25) is installed on the surface opposite to the surface connected to the fin 22 in each of the base 21a and the base 21b.

[0064] Here, in the present embodiment, at least a part of the fin 22 thermally connected to the converter 24 via the base 21 a is configured to be thermally connected to the chopper 25 via the base 21 b .

[0065] That is, the fins 22 that release heat from the converter 24 and the fins that release heat from the chopper 25 are configured such that at least a portion of the fins 22 overlap (there is a common fin that releases heat).

[0066] In this embodiment, fin 22 includes fin 22a and fin 22b. Fin 22b is thermally connected to converter 24 via base 21a and thermally connected to chopper 25 via base 21b. Fin 22a is thermally connected to inverter 23 via base 21 (base 21a or base 21b) on which inverter 23 is mounted.

[0067] In this example, the size (mounting area in the base) of the converter 24 is the same as that of the chopper 25 , so the fins that release heat from the converter 24 coincide with the fins that release heat from the chopper 25 .

[0068] When the inverter is supplying power, Figure 8 As shown, the heat dissipated from fin 22a increases due to the operation of inverter 23, and the heat dissipated from fin 22b increases due to the operation of converter 24. In this case, the heat dissipated from chopper 25 is quite small, so fin 22b is mainly used for heat dissipation from converter 24.

[0069] On the other hand, when powered by battery, Fig. 9 As shown. The amount of heat dissipated from the fin 22a increases due to the operation of the inverter 23, and the amount of heat dissipated from the fin 22b increases due to the operation of the chopper 25. In this case, since the converter 24 is not used, the fin 22b is used for heat dissipation from the chopper 25.

[0070] Thus, according to the uninterruptible power supply device 1 of the embodiment of the present invention, the base 21a and the base 21b are arranged opposite to each other. The fin 22 is arranged between the base 21a and the base 21b, and is connected to both the base 21a and the base 21b. The power conversion device 20 is installed on the surface opposite to the surface connected to the fin 22 in each of the base 21a and the base 21b. The inverter 23 is installed on one of the base 21a and the base 21b. The converter 24 is installed on the base 21a. The chopper 25 is installed on the base 21b. At least a part of the fin 22 thermally connected to the converter 24 via the base 21a is thermally connected to the chopper 25 via the base 21b.

[0071] When the inverter is powered and when the battery is powered, one of the converter 24 and the chopper 25 is selectively used, so that the fins used by the converter 24 and the chopper 25 are shared, thereby improving the utilization rate of the fins and improving the cooling efficiency of the device. Therefore, compared with the case of using a heat pipe or a heat diffusion material to diffuse heat to the entire fin (improving the utilization rate of the fin), the cost of the device can be reduced by cooling only by air cooling. In addition, by providing two bases on both sides of the fin and installing the inverter 23, the converter 24 and the chopper 25 (installing components on both sides of the fin), the device can be miniaturized compared to installing them on one base. In this way, the cost of the device can be reduced and the cooling efficiency can be improved.

[0072] In addition, the fin 22 includes a fin 22a and a fin 22b. The fin 22b is thermally connected to the converter 24 via the base 21a, and is thermally connected to the chopper 25 via the base 21b. The fin 22a is thermally connected to the inverter 23 via the base 21 (base 21a or base 21b) on which the inverter 23 is mounted. In this way, the fins (fins 22a) used by the converter 24 and the chopper 25 are different from the fins (fins 22b) used by the inverter 23, so the cooling efficiency of the inverter 23 is not reduced by the heat of the converter 24 or the chopper 25.

[0073] Fig.10 2 is a front view of the heat sink 29 and the power conversion device 20 of the modification example 1. In the modification example 1, the chopper 25a having a smaller size (mounting area in the base) than the converter 24 is mounted on the base 21b. Other conditions and uses Figure 6 to Figure 9 The examples described are the same.

[0074] In this case, the chopper 25a may be mounted so that at least a portion of the fins 22 thermally connected to the converter 24 via the base 21a is thermally connected to the chopper 25a via the base 21b. In the first modification, the fins 22b used by the chopper 25a are also used by the converter 24.

[0075] In addition, when the size of the chopper 25a is larger than the converter 24, the size (mountable area) of the bases 21a and 21b may be increased so that the fins used by the chopper 25a and the fins used by the inverter 23 do not overlap. Alternatively, if space saving is important, the fins used by the chopper 25a and the fins used by the inverter 23 may overlap partially. In the latter case, by mounting the inverter 23 on the base 21a, space saving can be achieved more than when the inverter 23 is mounted on the base 21b.

[0076] Fig.112 is a front view of the heat sink 29 and the power conversion device 20 of the second modification. In the second modification, the inverter 23 is mounted on the base 21b. Other conditions and uses Figure 6 to Figure 9 The examples described are the same.

[0077] In this case, when the size of the chopper 25 is larger than the converter 24, the size (mountable area) of the bases 21a and 21b may be increased so that the fins used by the converter 24 and the fins used by the inverter 23 do not overlap. Alternatively, if space saving is important, the fins used by the converter 24 and the fins used by the inverter 23 may overlap partially. In the latter case, by mounting the inverter 23 on the base 21b, space saving can be achieved more than when the inverter 23 is mounted on the base 21a.

[0078] The embodiments disclosed this time should be considered in all respects as illustrative and non-restrictive. The scope of the present invention is indicated by the claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0079] Description of Reference Numerals

[0080] 1 uninterruptible power supply device, 10, 20 power conversion device, 11, 21 base, 12, 12a~12c, 22, 22a, 22b fins, 13, 23 inverter, 14, 24 converter, 15, 25 chopper, 19, 29 heat sink, 13a~13d, 14a~14d, 15a, 15b power module, 30 control device, 31 commercial AC power supply, 32 load, 33 battery (power storage device), 35 bypass circuit (semiconductor switch), 36~38 electromagnetic contactor, T1 AC input terminal, T2 AC output terminal, T3 battery terminal.

Claims

1. An uninterruptible power supply device, connected between an AC power source and a load, characterized in that: have: The heat sink includes: a first base and a second base arranged opposite to each other; and a fin arranged between the first base and the second base and connected to both the first base and the second base; and A power conversion device is mounted on a surface of each of the first base and the second base opposite to a surface connected to the fin. The power conversion device comprises: a converter that converts AC power supplied from the AC power source into DC power and stops when the AC power source fails; a chopper for adjusting the voltage of the DC power supplied from the power storage device when the AC power source fails; and an inverter that converts the DC power output by the converter or the DC power output by the power storage device into AC power and supplies the power to the load, The inverter is installed on one of the first base and the second base. The converter is mounted on the first base. The chopper is mounted on the second base, At least a portion of the fin thermally connected to the converter via the first pedestal is thermally connected to the chopper via the second pedestal.

2. The uninterruptible power supply device according to claim 1, characterized in that: The fin includes a first fin and a second fin, The first fin is thermally connected to the converter via the first base, and is thermally connected to the chopper via the second base, The second fin is thermally connected to the inverter via a base on which the inverter is mounted.

3. The uninterruptible power supply device according to claim 1 or 2, characterized in that: The inverter is installed on the first base.

4. The uninterruptible power supply device according to claim 1 or 2, characterized in that: The inverter is installed on the second base.

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