JP2004064978A - Power converter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power converter whose reliability is raised by enabling the backup at power failure singly with a user board and also which takes account of environmental aspect, too, by contriving the downsizing and the weight reduction of a front end. <P>SOLUTION: DC/DC modules 41a-41c mounted on a user board 1 are supplied with DC input voltage from the front end 22. This power converter is equipped with one or more battery modules 52 and 53 which can be mounted dispersedly on the user board 1 by mounting a lithium ion battery 32. At power failure, this power converter supplies DC/DC modules 41a-41c with DC back up voltage from the lithium ion battery in place of the front end 22. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a DC-fed power converter having a power failure backup function.
[0002]
[Problems to be solved by the invention]
2. Description of the Related Art In a DC power supply device for supplying a DC voltage to a user load, the devices have been increasingly dispersed, and various DC / DC modules used differently for realizing the device have been widely used.
[0003]
FIG. 7 shows a conventional example of a power conversion device that supplies a required DC voltage to user loads 2a to 2e in a DC operation mounted on a user board 1 as a substrate. In the figure, a power converter 20 here includes a front-end unit 22 that converts an AC input voltage from an input terminal 21 into a DC voltage, and a DC voltage from the front-end unit 22 to each of the user loads 2a to 2a. And a back-end unit 23 that converts the DC voltage into a desired DC voltage suitable for 2e.
[0004]
The front end unit 22 is provided with a rectifier 31 as a rectifier as a rectifier that rectifies the AC input voltage from the input terminal 21 as a typical configuration. In addition, for example, the AC input voltage is reduced due to a power failure or the like. When the battery voltage drops, a power failure backup battery 32 that supplies a DC voltage to the back-end unit 23, a battery charger 33 that supplies a charging voltage to the battery 32 using a DC voltage output from the rectifier 31, A diode 34 for preventing backflow from the end portion 23 to the front end portion 22.
[0005]
Among them, the battery charger 33 is turned on when the battery 32 is charged, and is turned on when the battery 32 is charged. The PNP transistor 35 is a switch means for supplying the DC voltage from the rectifier 31 to the battery 32. It has a function as a charger comprising a diode 36 connected in parallel and conducting when the battery 32 is discharged.
[0006]
On the other hand, the DC / DC modules 41a to 41e constituting the back end unit 23 convert the DC input voltage of, for example, DC48V or DC24V supplied from the front end unit 22 into a desired DC output voltage suitable for each of the user loads 2a to 2e. The DC / DC modules 41a to 41e according to the operating voltages and capacities of the user loads 2a to 2e are selected and mounted on the user board 1 together with the user loads 2a to 2e.
[0007]
In the DC / DC modules 41a to 41e, the mounting area of the user board 1 is limited. In addition, if the shapes of the DC / DC modules 41a to 41e used differ from manufacturer to manufacturer, redesign is required each time. To prevent this, the shapes of the DC / DC modules 41a to 41e need to be Standard sizes are widely used, for example, full-brick size (61 mm in length, 116.8 mm in width), half-brick size (61 mm in length, 57.9 mm in width), and quarter-brick size (36 in length) by power capacity. 0.8 mm, 57.9 mm in width) and half-quart-brick size (36.8 mm in height, 29 mm in width) which is half the size of the quarter-brick size. I have.
[0008]
However, focusing on the back-up function, contrary to the distributed DC / DC modules 41a to 41e, the DC / DC modules 41a to 41e are still taken in the rectifier 31 of the front end unit 22 or provided outside. And a centralized power supply system for simultaneously supplying backup power to the entire user board 1 or a plurality of user boards 1. For this reason, the backup function of the back-end unit 23 must rely on the battery 32 of the common front-end unit 22. If any abnormality occurs in the front-end unit 22, the operation of the entire user board 1 is stopped, Sex was reduced.
[0009]
In addition, since the battery 32 is a lead battery, it is bulky and heavy, and its handling is difficult. In addition, under the current situation where lead-free solder is being used, mounting the lead battery 32 on the user board 1 is regarded as an environmental problem.
[0010]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to enable a power failure backup using a user board alone, thereby improving the reliability of the device and reducing the size of the front end unit. Another object of the present invention is to obtain a power converter that is lighter in weight and environmentally friendly.
[0011]
[Means for Solving the Problems]
In the power conversion device according to claim 1 of the present invention, a DC / DC module is provided by adopting a lithium ion battery instead of a lead battery so that the battery unit which has been located in the front end unit up to that point is used as a battery module equipped with a lithium ion battery. Can be distributed and implemented on the same user board. Therefore, the DC / DC module and the battery module can be incorporated in the common user board, and the power failure backup can be performed by the user board alone, and the reliability of the device can be improved. Also, by mounting the battery module having the power failure backup function on the user board, the front end can be reduced in size and weight. In addition, since a lead battery is not used, an environmentally friendly device can be realized.
[0012]
In the power converter according to the second aspect of the present invention, the function as a charger for charging the lithium ion battery can be provided for the battery module.
[0013]
In the power converter according to the third aspect of the present invention, since the DC / DC module and the battery module are both formed in standardized dimensions, the DC / DC module and the battery are installed in a limited mounting space of the user board. Modules can be arranged neatly.
[0014]
In the power converter according to the fourth aspect of the present invention, the dimensions of the battery module all conform to the current global standard size, and dimensional unification with existing DC / DC modules can be achieved.
[0015]
In the power converter according to claim 5 of the present invention, the function as a charger for charging the lithium ion battery is incorporated in a charger module different from the battery module. Therefore, the individual battery modules and charger modules are separated and independent for each function, and are further reduced in size and weight, so that the user can easily handle them.
[0016]
In the power converter according to claim 6 of the present invention, since the DC / DC module, the battery module, and the charger module are all formed to standardized dimensions, the DC / DC module is limited in the mounting space of the user board. The DC module, the battery module and the charger module can be arranged neatly.
[0017]
In the power converter according to claim 7 of the present invention, the dimensions of the battery module and the charger module all conform to the current global standard size, and the dimensions are unified with existing DC / DC modules. Can be.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same parts as those in FIGS. 4 and 5 are denoted by the same reference numerals, and description of common parts will be omitted because they are duplicated.
[0019]
FIG. 1 shows the entire configuration of the apparatus. Here, as described above, user loads 2a to 2c for DC operation to be operated are mounted on the user board 1. Of course, the user loads 2a to 2c may be the same or different, and the number is not particularly limited as long as the space of the user board 1 permits. Here, DC / DC modules 41a to 41c are provided on the user board 1, respectively, so that necessary power can be supplied to the user loads 2a to 2c. Each of the DC / DC modules 41a to 41c constitutes a back-end unit 23 that converts a DC voltage from the front-end unit 22 into a desired DC voltage suitable for the respective user loads 2a to 2c. , Full brick size, half brick size, quarter brick size, half quarter brick size.
[0020]
The front end unit 22 is located at a different position from the user board 1 and has a representative configuration of a rectifier 31 for rectifying an AC input voltage from the input terminal 21. And a diode 34 for preventing backflow to the battery. The rectifier 31 converts an AC input voltage of, for example, AC 100 V into a DC voltage of, for example, DC 48 V or DC 24 V widely used in the field of information communication equipment, and supplies this to the user board 1.
[0021]
The user board 1 includes, in addition to the user loads 2a to 2c and the DC / DC modules 41a to 41c connected in series, a charger module 51 and a battery module 52 connected in series, which are features of the present embodiment, and a charger. The other built-in battery modules 53 are mounted on the output side of the rectifier 31, respectively. In particular, the battery 32 serving as a backup source mounted on the battery modules 52 and 53 uses a small and lightweight lithium ion battery instead of a lead battery, thereby realizing a module configuration that can be mounted on the user board 1. are doing.
[0022]
The configuration of the charger module 51 is such that a PNP transistor 35 serving as a switch for supplying a DC voltage from the rectifier 31 to the battery 32 by being turned on when the dependent battery 32 is charged, and an emitter-collector of the transistor 33. A diode 36 is connected in anti-parallel and conducts when the subordinate battery 32 is discharged, so that a DC backup voltage can be supplied to the DC / DC modules 41a to 41c. That is, since the charger module 51 itself is composed of only the transistor 35 and the diode 36, the modularization is relatively easy. Also, the battery module 53 with a built-in charger has a built-in equivalent function including the transistor 35 and the diode 36. Therefore, if the battery module 53 with a built-in charger is provided, a power failure backup for the user loads 2a to 2c can be realized only by mounting the battery module 53 on the user board 1 without separately preparing a charger.
[0023]
In the configuration of FIG. 1, when the AC input voltage from the input terminal 21 is at a normal voltage level, the AC input voltage is rectified by the rectifier 31 and the DC input voltage is supplied to the user board 1 through the diode 34. It is supplied to each of the mounted DC / DC modules 41a to 41c. As a result, each of the DC / DC modules 41a to 41c converts the DC voltage into a DC voltage required for the user loads 2a to 2c and supplies the DC voltage to the subordinate DC / DC modules 41a to 41c. In this case, in response to the fact that the AC input voltage and thus the DC input voltage are normal, each transistor 35 of the charger module 51 and the battery module 53 with a built-in charger is turned on, and the DC input voltage is passed through the transistor 35. The battery 32 is charged.
[0024]
On the other hand, when the AC input voltage from the input terminal 21 decreases due to a power failure and the DC input voltage applied to the user board 1 becomes lower than the charging voltage of the battery 32, the charger module 51 or the battery module with a built-in charger The 53 transistor 53 is turned off and the diode 36 is turned on to supply the charging voltage of the battery 32 to the input side of each of the DC / DC modules 41a to 41c as a DC backup voltage. As a result, as long as the capacity of the battery 32 permits, the required DC voltage can be supplied from each of the DC / DC modules 41a to 41c to the subordinate user loads 2a to 2c.
[0025]
It is preferable that the number of the battery modules 52 and 53 be appropriately increased or decreased according to the number of the user loads 2a to 2c mounted on the user board 1. If the battery modules 52 and 53 are connected in parallel, the backup power supplied to the user loads 2a to 2c can be increased accordingly. At this time, if extra battery modules 52 and 53 are connected in parallel, even if one of the battery modules 52 and 53 has any abnormality, a redundant operation in which a DC backup voltage can be normally supplied can be realized. If the required DC backup voltage cannot be obtained by the battery modules 52 and 53 alone, the battery module 52 constituted by only another battery 32 may be connected in series to the existing battery modules 52 and 53. Such connection can be realized very easily only by mounting on the user board 1 because the battery modules 52 and 53 are provided as independent packages.
[0026]
Various types of charger modules 51 and battery modules 52 and 53 are prepared according to the capacity of the battery 32, for example. The user selects one or a plurality of charger modules 51 and battery modules 52 and 53 as necessary, and connects the selected charger module 51 and battery modules 52 and 53 to the same user to which the user loads 2a to 2c are attached. If mounted on the board 1, a power failure backup for the user loads 2a to 2c is realized.
[0027]
Here, external configurations (a plan view, a front view, and a side view) of the charger module 51 and the battery modules 52 and 53 are shown in FIGS. FIG. 2 shows a full brick size charger module 51 and battery modules 52 and 53. The length L is 61 mm, the width W is 116.8 mm, and the height (thickness) H is 12.7 mm. FIG. 3 shows a full-brick size charger module 51 and battery modules 52 and 53. The length L is 61 mm, the width W is 57.9 mm, and the height H is 12.7 mm. FIG. 4 shows a charger module 51 and battery modules 52 and 53 of a quarter-brick size. The length L is 36.8 mm, the width W is 57.9 mm, and the height H is 8.5 mm. FIG. 5 shows a charger module 51 and battery modules 52 and 53 each having a half-quart-brick size. The length L is 36.8 mm, the width W is 29 mm, and the height H is 8.5 mm. Further, it is preferable to select the DC / DC modules 41a to 41c that are unified into any of these sizes. Then, the charger module 51, the battery modules 52 and 53, and the DC / DC modules 41a to 41c are unified to a predetermined size, and the design in the user board 1 is facilitated, and the charger module 51 and the battery module 52 and 53 and the DC / DC modules 41a to 41c can be arranged neatly in a limited space of the user board 1.
[0028]
The charger module 51 and the battery modules 52 and 53 are constituted by a casing 61 for accommodating main functional parts and a socket 62 provided at a lower part of the casing 61 regardless of the size described above. The socket 62 can be inserted into and removed from the terminal pins provided on the board 1 with one touch. This facilitates replacement of the charger module 51 and the battery modules 52 and 53.
[0029]
In the present embodiment, in particular, in order to provide a power failure backup function on the user board 1 instead of the front end unit 22, the battery modules 52 and 53 equipped with the battery 32 made of a lithium ion battery are connected to the DC / DC modules 41a to 41a. It is unified to the same standard size as 41c and mounted on the user board 1. As a result, even if an abnormality occurs in a certain circuit of the user board 1, the user board alone can be backed up without affecting the DC48V or DC24V line of the front end unit 22. That is, similarly to the DC / DC modules 41a to 41c, the battery modules 52 and 53 can be distributed on the user board 1, and if the battery 32 in the front end unit 22 becomes abnormal as in the related art, It is possible to avoid the problem that the backup function for all the user loads 2a to 2c becomes inoperable, thereby improving the reliability.
[0030]
FIG. 6 is an overall configuration of an apparatus showing another modification. FIG. 1 shows a configuration for backing up the DC input voltage supplied from the front end unit 22, but here shows a configuration for backing up the output voltages of the DC / DC modules 41a to 41c. The difference from FIG. 1 is that the charging voltage of the battery 32 is directly supplied as a DC backup voltage to the user loads 2a to 2c through the diode 71, and the rest is common to FIG.
[0031]
In FIG. 1 and FIG. 6, in consideration of a situation where all the batteries 32 mounted on the user board 1 cannot supply a DC battery voltage, the battery 32 or the battery charger as shown in FIG. 33 may be provided. In this case, the reliability of the device is further improved.
[0032]
As described above, in the present embodiment, in the power converter that supplies the DC input voltage from the front end unit 22 to the DC / DC modules 41a to 41c mounted on the user board 1, the battery 32 of the lithium ion battery is mounted. And one or more battery modules 52 and 53 that can be distributed and mounted on the user board 1 and supply a DC backup voltage from a lithium ion battery to the DC / DC modules 41a to 41c instead of the front end unit 22 in the event of a power failure. It is configured as follows.
[0033]
That is, by adopting a lithium ion battery instead of a lead battery, the battery unit (battery charger 33) which has been in the front end unit 22 is changed to the DC / DC module 41a as the battery modules 52 and 53 equipped with the lithium ion battery. 41c can be distributed and mounted on the same user board 1. Therefore, the DC / DC modules 41a to 41c and the battery modules 52 and 53 can be incorporated in the common user board, and the power failure backup can be performed by the user board 1 alone, and the reliability of the device can be improved. Further, by mounting the battery modules 52 and 53 having the power failure backup function on the user board 1, the size and weight of the front end unit 22 can be reduced. Moreover, since a lead battery is not used, for example, when lead-free solder is used for the user board 1, a device that is environmentally friendly can be realized.
[0034]
In the present embodiment, a charger (transistor 35 and diode 36) for charging the battery 32 of the lithium ion battery is incorporated as a battery module 53 with a built-in charger. This allows the battery module 53 to have a function as a charger for charging the lithium ion battery.
[0035]
In this embodiment, a charger for charging a lithium ion battery, for example, including a transistor 35 and a diode 36, is separate from the battery module 52 and can be mounted on the user board 1 together with the battery module 52. Built-in charger module 51.
[0036]
In this case, the function as a charger for charging the battery 32 of the lithium ion battery is incorporated in a charger module 51 different from the battery module 52. Therefore, the individual battery modules 52 and the charger modules 51 are further reduced in size and weight separately and independently for each function, and the handling on the user side becomes easy.
[0037]
In the present embodiment, the battery module and the charger module are formed in accordance with the DC / DC modules 41a to 41c whose dimensions are standardized in advance. That is, since the DC / DC modules 41a to 41c, the battery modules 52 and 53, and the charger module 51 are all formed to standardized dimensions, the DC / DC modules are limited in the mounting space of the user board 1. 41a to 41c, the battery modules 52 and 53, and the charger module 51 can be arranged neatly.
[0038]
The dimensions of the battery modules 52 and 53 and the charger module 51 in this embodiment are 61 mm long and 116.8 mm wide, 61 mm long and 57.9 mm wide, 36.8 mm long and 57.9 mm wide, 36.8 mm long and It is formed in any one of 29 mm in width.
[0039]
By doing so, the dimensions of the battery modules 52, 53 and the charger module 51 all conform to the current global standard size consisting of full brick size, half brick size, quarter brick size, and half quarter brick size. Of the DC / DC modules 41a to 41c.
[0040]
It should be noted that the present invention is not limited to the above embodiment, and various modifications are possible.
[0041]
【The invention's effect】
In the power converter according to the first aspect of the present invention, the power failure can be backed up by the user board alone to improve the reliability of the device, and at the same time to reduce the size and weight of the front end portion and to consider the environment. Power conversion device can be obtained.
[0042]
In the power converter according to the second aspect of the present invention, the function of the charger can be shared by the battery module.
[0043]
In the power converter according to the third aspect of the present invention, the DC / DC module and the battery module can be arranged neatly in the limited mounting space of the user board.
[0044]
According to the power converter of the fourth aspect of the present invention, the battery module can be dimensionally unified with the existing DC / DC module.
[0045]
In the power converter according to claim 5 of the present invention, the individual battery modules and the charger modules are separated and independent for each function, and are further reduced in size and weight, so that the handling on the user side can be facilitated.
[0046]
According to the power converter of the sixth aspect of the present invention, the DC / DC module, the battery module, and the charger module can be arranged neatly in the limited mounting space of the user board.
[0047]
The power converter according to claim 7 of the present invention relates to a battery module and a charger module, and can achieve dimensional unification with an existing DC / DC module.
[Brief description of the drawings]
FIG. 1 is a block diagram of a power converter showing an embodiment of the present invention.
FIG. 2 is a plan view, a front view, and a side view of a full-brick size charger module and a battery module showing one embodiment of the present invention.
FIG. 3 is a plan view, a front view, and a side view of a half-brick size charger module or battery module showing an embodiment of the present invention.
FIG. 4 is a plan view, a front view, and a side view of a quarter-brick size charger module and a battery module showing one embodiment of the present invention.
FIG. 5 is a plan view, a front view, and a side view of a charger module and a battery module of a half quarter-brick size showing an embodiment of the present invention.
FIG. 6 is a block diagram of a power conversion device showing another modification of the present invention.
FIG. 7 is a block diagram of a power conversion device showing a conventional example.
[Explanation of symbols]
1 User board 22 Front end unit 32 Battery (lithium ion battery)
35 Transistor (charger)
36 Diode (charger)
41a-41c DC / DC module 51 Charger module 52, 53 Battery module

Claims (7)

In a power converter for supplying a DC voltage from a front end unit to a DC / DC module mounted on a user board,
One or more battery modules that can be mounted separately on the user board by mounting a lithium ion battery,
A power converter, wherein a DC backup voltage is supplied from the lithium ion battery to the DC / DC module in place of the front end unit at the time of a power failure. The power converter according to claim 1, wherein a charger for charging the lithium ion battery is incorporated in the battery module. The power converter according to claim 1, wherein the battery module is formed in accordance with the DC / DC module whose dimensions are standardized. 4. The battery module according to claim 1, wherein the dimensions of the battery module are any of 61 mm long and 116.8 mm wide, 61 mm long and 57.9 mm wide, 36.8 mm long and 57.9 mm wide, 36.8 mm long and 29 mm wide. 5. The power converter according to any one of the above. The battery charger for charging the lithium ion battery is separate from the battery module, and is incorporated in a charger module that can be mounted on the user board together with the battery module. Power converter. The power converter according to claim 5, wherein the battery module and the charger module are formed in accordance with the DC / DC module whose dimensions are standardized. The dimensions of the battery module and the charger module are any of 61 mm and 116.8 mm, 61 mm and 57.9 mm, 36.8 mm and 57.9 mm, 36.8 mm and 29 mm. The power converter according to claim 5.

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