JP5493324B2 - Electronics - Google Patents

Description

The present invention relates to a suitable electronic device such as a battery power source of the projector apparatus having a heat source for emitting high heat.

Conventionally, with the aim of eliminating all the inefficiencies and inefficiencies in which the discharge time is undesirably shortened by controlling all of the capacities of each of the plurality of battery packs to be efficiently discharged. A technique has been conceived in which two battery packs are controlled to be discharged and stopped alternately at predetermined time intervals and repeated several times, at least twice. (For example, Patent Document 1)
Japanese Patent Laid-Open No. 11-252812

  The technique described in the above patent document is considered to be effective when a plurality of batteries originally have the same capacity and the same remaining amount. On the other hand, when using a plurality of batteries having significantly different original capacities, or using a plurality of batteries having different remaining capacities, it is not possible to cope with this by performing the control as described above. Although the remaining capacity of the battery is still sufficient, the other battery may be completely discharged, resulting in a situation where a plurality of batteries cannot be used effectively.

  Moreover, the technique described in the said patent document does not consider the influence of the heat with respect to a battery at all. For example, in the case of a device having a very high temperature heat source such as a projector device and having a plurality of batteries, or a single battery having a plurality of cells in the battery pack, the positional relationship with the heat source between them As a result of the temperature difference due to the above, there is a problem in that the high temperature side tends to be over-discharged, and as a result, the charge / discharge cycle life is shortened.

  FIG. 5 is a diagram illustrating the cycle life of the lithium ion secondary battery for each environmental temperature. As shown in the figure, it can be understood that as the environmental temperature Ta increases, the remaining capacity decreases remarkably as the number of charge / discharge cycles increases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electronic device capable of extending the life of a rechargeable battery serving as a power source .

The invention according to claim 1 is an electronic device, and distributes power supply periods from the plurality of rechargeable batteries based on a plurality of rechargeable batteries, a heat source, and a positional relationship between the plurality of rechargeable batteries and the heat source. In addition, the present invention is characterized by comprising power supply control means for cyclically selecting the plurality of rechargeable batteries and supplying power from the selected rechargeable batteries to a load in the device.

According to a second aspect of the present invention, in the first aspect of the invention, the power supply control means is configured such that the continuous drive time of the rechargeable battery closer to the heat source is shorter than the continuous drive time of the rechargeable battery far from the heat source. Electric power is supplied from a plurality of rechargeable batteries to a load in the device.
The invention according to claim 3 is the invention according to claim 1 or 2, wherein the power supply control means distributes the power supply period so that the power supply periods from the plurality of rechargeable batteries are continuous. To do.
The invention according to claim 4 is the invention according to any one of claims 1 to 3, further comprising detection means for detecting the temperature of each of the plurality of rechargeable batteries, wherein the power supply control means is detected by the detection means. The plurality of rechargeable batteries are cyclically selected according to the temperature, and power is supplied from the selected rechargeable batteries to a load in the device.
According to a fifth aspect of the present invention, in the invention of the fourth aspect , the power supply control means is configured such that the continuous driving time of a higher temperature rechargeable battery is shorter than the continuous driving time of a lower temperature rechargeable battery. The rechargeable battery is cyclically selected, and power is supplied from the selected rechargeable battery to a load in the device.
The invention according to claim 6 is the invention according to any one of claims 1 to 5 , wherein the detection means further detects a remaining capacity of each of the plurality of rechargeable batteries, and the power control means is the detection means. The plurality of rechargeable batteries are cyclically selected according to the detection result detected in step 1, and power is supplied from the selected rechargeable batteries to a load in the device.

According to the present invention, it is possible to extend the life of a rechargeable battery serving as a power source .

  Hereinafter, an embodiment in which the present invention is applied to a data projector apparatus of DLP (Digital Light Processing) (registered trademark) system will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic functional configuration of the data projector apparatus 10 according to the embodiment.

  An input / output connector unit 11 includes, for example, a pin jack (RCA) type video input terminal, a D-sub15 type RGB input terminal, and a USB (Universal Serial Bus) connector.

  Image signals of various standards input from the input / output connector unit 11 are input to an image conversion unit 13 that is also generally referred to as a scaler via an input / output interface (I / F) 12 and a system bus SB.

  The image conversion unit 13 unifies the input image signal into an image signal of a predetermined format suitable for projection, and appropriately stores it in the video RAM 14 which is a buffer memory for display, and then sends it to the projection image processing unit 15.

  At this time, data such as symbols indicating various operation states for OSD (On Screen Display) is also superimposed on the image signal by the video RAM 14 as necessary, and the processed image signal is sent to the projection image processing unit 15.

  The projection image processing unit 15 multiplies a frame rate according to a predetermined format, for example, 60 [frames / second], the number of color component divisions, and the number of display gradations, in accordance with the transmitted image signal. The micromirror element 16, which is a spatial light modulation element (SOM), is driven to display by high-speed time division driving.

  On the other hand, a light source lamp 18 using, for example, a high-pressure mercury lamp disposed in the reflector 17 emits white light with high luminance. The light source lamp 18 is AC driven by the power from the ballast circuit 19. The white light emitted from the light source lamp 18 is colored into primary colors in a time-division manner through a color wheel 20 that rotates at high speed in synchronization with the display on the micromirror element 16, and is converted into a luminous flux having a substantially uniform luminance distribution by the integrator 21. After that, the light is totally reflected by the mirror 22 and applied to the micromirror element 16.

  Then, an optical image is formed by the reflected light from the micromirror element 16, and the formed optical image is projected through a projection lens unit 23 onto a screen (not shown) to be projected.

  The projection lens unit 23 enlarges and projects the optical image formed by the micromirror element 16 onto a target such as a screen, and can change the in-focus position and the zoom position (projection angle of view) arbitrarily. .

  That is, in the optical lens system (not shown) constituting the projection lens unit 23, both the focus lens and the zoom lens are controlled by moving back and forth along the optical axis direction. These lenses are stepping motors (M). It moves by 24 rotational drive.

  In addition, power supply to the ballast circuit 19 for turning on the light source lamp 18, detection of temperature information from the temperature sensor 25 mounted near the light source lamp 18 of the reflector 17, and a cooling fan 26 for cooling the light source lamp 18 are provided. Rotation drive of a fan motor (M) 27 for rotation drive, rotation drive of the motor (M) 28 for the color wheel 20, rotation of a fan motor (M) 30 for rotation drive of a cooling fan 29 for cooling the projection lens unit 23 The projection light processing unit 32 executes the drive, the rotational drive of the stepping motor 24, and the detection of temperature information from the temperature sensor 31 mounted near the focus lens (not shown) of the projection lens unit 23.

  The projection image processing unit 15 outputs a lamp synchronization signal synchronized with the switching timing of the image for each color component displayed on the micromirror element 16 to the ballast circuit 19 and the projection light processing unit 32.

  The CPU 33 controls all the operations of the above circuits. This CPU 33 uses a main memory 34 composed of DRAM, and a program memory 35 composed of an electrically rewritable nonvolatile memory storing an operation program including power supply control processing (to be described later) and various fixed data. A control operation in the projector device 10 is executed.

  The CPU 33 executes various projection operations in accordance with operation signals from the operation unit 36. The operation unit 36 includes a key operation unit provided in the housing body of the data projector device 10 and an infrared receiving unit that receives an infrared modulation signal from a remote controller (not shown) dedicated to the data projector device 10. Directly outputs to the CPU 33 a key code signal based on the key operated via the key operation unit or the remote controller.

The CPU 33 is further connected to an audio processing unit 37 and a power processing unit 38 via the system bus SB.
The sound processing unit 37 includes a sound source circuit such as a PCM sound source, converts the sound data given during the projection operation into an analog signal, drives the speaker unit 39 to emit a loud sound, or generates a beep sound or the like if necessary.

  The power supply processing unit 38 performs charge / discharge control of the two rechargeable batteries (1st Batt., 2nd Batt.) 40A and 40B which are the power supplies of the data projector device 10, and uses the power obtained from the rechargeable batteries 40A and 40B. It is converted into a voltage value necessary for each circuit and supplied.

  The rechargeable batteries 40A, 40B are both constituted by, for example, the same type of lithium ion secondary battery pack, and a signal indicating the temperature of the battery pack is sent to the power processing unit 38 from a controller (not shown) used inside. Are output.

  FIG. 2 exemplifies a part of the main configuration as a mounting component in the main casing 10A of the data projector device 10 in a simplified manner. In the figure, the light source light emitted from the lamp unit 41 in which the light source lamp 18, the reflector 17, the temperature sensor 25 and the like are integrated is projected by the projection lens unit 23. Since the lamp unit 41 serves as a heat source, cooling is performed around the lamp unit 41 by a cooling fan system 42 including the cooling fan 26, the fan motor 27, the cooling fan 29, the fan motor 30, and the like.

  The heat generated from the lamp unit 41 as a heat source propagates to the rechargeable batteries 40A and 40B through the heat insulating member 43 as indicated by an arrow H in the drawing, and is located closer to the lamp unit 41, for example, Most of the rechargeable battery 40A becomes a high temperature portion W indicated by a broken line in the figure, and a large temperature difference is generated between the rechargeable battery 40B located on the side away from the lamp unit 41.

  As described above, each of the rechargeable batteries 40A and 40B has a function of detecting an internal temperature by an internal controller and outputting the detected temperature to the power supply processing unit 38. Therefore, the power supply processing unit 38 uses the rechargeable batteries 40A and 40B. The internal temperature can be recognized as needed as needed.

Next, the operation of the above embodiment will be described.
FIG. 3 shows the load setting process for the rechargeable batteries 40A and 40B, which is executed by the power supply processing unit 38 under the control of the CPU 33. The CPU 33 stores the operation program read from the program memory 35 in the main memory 34. By developing, the operation program is executed and the power supply processing unit 38 is controlled.

  Initially, the power supply processing unit 38 determines whether or not it is time to set the load of the rechargeable batteries 40A and 40B again (step S101).

  This timing is, for example, when the data projector device 10 is powered on, at every elapse of a fixed time counted by the CPU 33, and the load-side operation state where the rechargeable batteries 40A and 40B supply power is changed to change the load amount. This includes cases where

  When it is time to reset the load of the rechargeable batteries 40A, 40B, it is determined in step S101, and the temperature and remaining capacity on the rechargeable battery 40A side are first detected (step S102). Here, the remaining capacity of the rechargeable battery is uniquely determined from the terminal voltage.

  Similarly, the temperature and remaining capacity on the rechargeable battery 40B side are detected (step S103).

  A period C in which both the rechargeable batteries 40A and 40B are alternately switched based on the detected temperatures and remaining capacity of the rechargeable batteries 40A and 40B, and a period in which the rechargeable battery 40A in the period C supplies power. t1 and the period t2 during which the rechargeable battery 40B supplies power are calculated (step S104).

  For this calculation process, an arithmetic expression prepared in advance in the operation program may be used, or a lookup table prepared in advance may be used.

  At this time, by setting the power supply period of the rechargeable battery on the higher temperature side shorter than the power supply period of the rechargeable battery on the lower temperature side, the temperature rises due to the influence from the lamp unit 41, It suppresses that the rechargeable battery in the discharged state is consumed.

  When the period C, the power supply period t1 of the rechargeable battery 40A, and the power supply period t2 of the rechargeable battery 40B are calculated in this way, settings are made to control the rechargeable batteries 40A and 40B according to the calculated contents (step S105). The series of processes of FIG. 3 is once completed as described above, and the process returns to the process from step S101 to wait for the timing for setting the load of the rechargeable batteries 40A and 40B again.

  FIG. 4 illustrates the discharge control contents of the rechargeable batteries 40A and 40B set by the processing as described above. As shown in the figure, the power supply period t1 of the rechargeable battery 40A on the higher temperature side under the influence of the lamp unit 41, which is a heat source, is set shorter than the power supply period t2 of the rechargeable battery 40B on the lower temperature side. The rechargeable batteries 40A and 40B are selected cyclically, and power is supplied from the selected rechargeable battery to a load in the device. Therefore, as shown in FIG. 2, the temperature rises due to the heat generated from the lamp unit 41, and the rechargeable battery 40A in an overdischarged state is prevented from being consumed faster than the rechargeable battery 40B. can do.

  As described above in detail, according to the present embodiment, in the various electronic devices such as the data projector apparatus 10 that have a heat source, a difference occurs in the discharge characteristics of a plurality of rechargeable batteries. It is possible to extend the life of a plurality of rechargeable batteries serving as a power source substantially evenly by eliminating the influence as much as possible.

  In the above-described embodiment, the data projector apparatus 10 having the two rechargeable batteries 40A and 40B has been described. However, the present invention does not limit the number of rechargeable batteries to two. But you can.

  Furthermore, even though the rechargeable battery itself is only one, it is also possible to control the plurality of cells constituting the battery pack of the rechargeable battery individually and switch the discharge in units of cells. Control can be performed in the same manner as in the case of provision.

  The above embodiment has been described for the case where the present invention is applied to a data projector apparatus. However, if the electronic device has a plurality of rechargeable batteries that can be affected by heat from the heating element, for example, a CPU is used as the heating element. The present invention can be similarly applied to various other electronic devices such as a mobile type personal computer that performs the above.

  In addition, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention in the implementation stage. Further, the functions executed in the above-described embodiments may be combined as appropriate as possible. The above-described embodiment includes various stages, and various inventions can be extracted by an appropriate combination of a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the effect is obtained, a configuration from which the constituent requirements are deleted can be extracted as an invention.

1 is a block diagram showing a schematic configuration of an electronic circuit of a data projector device according to an embodiment of the present invention. The figure which shows the mounting structure of the data projector apparatus which concerns on the same embodiment. The flowchart which shows the processing content of the load setting of the rechargeable battery by the power supply process part which concerns on the embodiment. The timing chart which shows the setting load content of the rechargeable battery which concerns on the same embodiment. The figure which illustrates the cycle life of the lithium ion secondary battery for every environmental temperature.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Data projector apparatus, 10A ... Main body casing, 11 ... Input / output connector part, 12 ... Input / output interface (I / F), 13 ... Image conversion part, 14 ... Video RAM, 15 ... Projection image processing part, 16 ... Micro Mirror element (SOM), 17 ... reflector, 18 ... light source lamp, 19 ... ballast circuit, 20 ... color wheel, 21 ... integrator, 22 ... mirror, 23 ... projection lens unit, 24 ... stepping motor (M), 25 ... temperature Sensor, 26 ... Cooling fan, 27 ... Fan motor (M), 28 ... Motor (M), 29 ... Cooling fan, 30 ... Fan motor (M), 31 ... Temperature sensor, 32 ... Projection light processing unit, 33 ... CPU 34 ... Main memory, 35 ... Program memory, 36 ... Operation unit, 37 ... Audio processing unit, 38 ... Power supply processing unit, 39 ... Speed Ca portions, 40A, 40B ... rechargeable battery (lithium ion secondary battery), 41 ... lamp unit 42 ... cooling fan system, 43 ... heat insulating member, SB ... system bus.

Claims (6)

A plurality of rechargeable batteries;
A heat source,
Based on the positional relationship between the plurality of rechargeable batteries and the heat source, after distributing the power supply period from the plurality of rechargeable batteries, the plurality of rechargeable batteries are cyclically selected, and the selected rechargeable battery is used in the device. An electronic device comprising: power supply control means for supplying power to a load of the electronic device.   The power supply control means causes power to be supplied from a plurality of rechargeable batteries to a load in the apparatus so that the continuous drive time of the rechargeable battery closer to the heat source is shorter than the continuous drive time of the rechargeable battery far from the heat source. The electronic device according to claim 1. 3. The electronic apparatus according to claim 1, wherein the power supply control unit distributes the power supply period so that the power supply periods from the plurality of rechargeable batteries are continuous. It further comprises detection means for detecting the temperature of each of the plurality of rechargeable batteries,
The power supply control unit cyclically selects the plurality of rechargeable batteries according to the temperature detected by the detecting unit, and supplies power from the selected rechargeable battery to a load in the device. Electronic device in any one of -3 . The power supply control means cyclically selects the plurality of rechargeable batteries so that the continuous drive time of a higher temperature rechargeable battery is shorter than the continuous drive time of a low temperature rechargeable battery, and the inside of the device from the selected rechargeable battery. The electronic device according to claim 4 , wherein power is supplied to the load. The detection means further detects the remaining capacity of each of the plurality of rechargeable batteries,
The power supply control unit cyclically selects the plurality of rechargeable batteries according to a detection result detected by the detection unit, and supplies power from the selected rechargeable battery to a load in the device. The electronic device in any one of 1-5 .

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