JP2010119244A - Charging device, charging control program, and charging method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a charging device, a charging control program, and a charging method which allow a battery to be charged quickly, up to the required battery residual capacity. <P>SOLUTION: A charge voltage value that is the battery voltage at the present point is measured (step SA1) and is stored (step SA2). Order of charging is determined (step SA3), in such a way that a battery with a lower charge voltage value is given a higher charge priority. Hence a battery with the lowest charge voltage is determined as being a first one in the charging order, and a battery with the second lowest charge voltage is determined as being a second in charge order. Full-scale charging is started with the first battery in charge order first (step SA4). Whether the charge voltage value V1 of the first battery in charge order becomes equal to "charge voltage value of the second battery in charge order+α" is decided; namely, whether V1=V2+α is satisfied, where V2 denotes the charge voltage value of the second battery in the charging order, is decided (step SA5). A full-scale charging (step SA4) is continued, until a decision of "YES" is made at step SA5 and is stopped, when a decision for YES is made. A loop of steps SA3 to SA7 is repeated, until all batteries become fully charged. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a charging device, a charging control program, and a charging method for charging a plurality of batteries.

  Conventionally, when charging each battery in a device using a plurality of batteries, a charging method in which each battery is fully charged in order has been performed, but at this point in time during charging with this method , A battery that has been fully charged and a battery that has not yet been charged will be mixed, and the device cannot operate until all the batteries are fully charged, so it takes a long time for the device to become operational, There was a problem of poor usability.

As what solves this, the thing of patent document 1 is known, for example. When charging the batteries B <b> 1 to B <b> 4, the charging device charges the battery B <b> 1 for a certain period of time and then charges the next battery B <b> 2 with the same time. Charging the batteries B1 to B4 over a certain period of time is defined as a charging cycle T, and the charging cycle T is repeated until all the batteries are fully charged, whereby all the batteries are finally fully charged. It is assumed that the remaining amount can be charged in a balanced manner on average.
JP 2000-324709 A

  By the way, in a device using a plurality of batteries, the size of the load to be connected may differ for each of the batteries B1 to B4. In this case, even if the batteries B1 to B4 have the same capacity, the battery at a certain point in time. The remaining amount will be different. However, in the above-described conventional charging device, the batteries B1 to B4 are charged with the same amount of charge sequentially without considering the remaining battery level at the time of starting charging or during charging. .

  Therefore, if there is a difference in the remaining amount of the batteries B1 to B4, charging is performed in the charging cycle T with this difference occurring. Therefore, it will be charged in a certain amount while maintaining the difference in remaining amount at the start of charging, and as a result, it is impossible to charge each battery remaining in a balanced manner until the device becomes operable There is a fear that the time will be extended again.

  Furthermore, if the battery B1 having the smallest remaining battery among the batteries B1 to B4 at the start of charging is B1, the battery B1 is always the most without any change in the order of the remaining capacity during charging according to the charging cycle T. The battery is low.

  The battery B1 having the smallest remaining battery level among the batteries B1 to B4 at the start of charging as described above has a smaller remaining battery level than the other batteries B2 to B4 because the connected load value is large. It is in a state. Therefore, since the value of the load to be connected is large, the value of the necessary remaining battery level at which the load can operate is also large. However, the battery B1 is always the battery with the least remaining battery level during charging in the charging cycle T, as described above, even though the value of the required remaining battery level in which the corresponding load can operate is large. , It is not possible to charge the battery to the required remaining battery capacity at an early stage.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a charging device, a charging control program, and a charging method that enable early charging to the required remaining battery level.

  In order to solve the above-mentioned problem, the charging device according to the first aspect of the present invention is a charging device for charging a plurality of batteries, and detects the voltage of each of the batteries, and detects the detected voltage of each battery. Based on the order determining means for determining at least the first and second charging orders, the charging means for charging the battery of the charging order 1 determined by the order determining means, and the charging order 1 charged by the charging means. The first judging means for judging whether or not the voltage of the battery in the charging order has exceeded the voltage of the battery in the charging order 2 by a predetermined value or more, and the voltage of the battery in the charging order 1 is in the charging order 2 by the first judging means. And charging control means for restarting the order determining means when it is determined that the voltage of the battery exceeds a predetermined value or more.

  In the charging device according to the second aspect of the present invention, second determination means for determining whether or not each battery is fully charged, or whether or not the voltage of each battery exceeds a predetermined value. And the charge control means terminates the charge without re-operating the order determination means when the second determination means determines that each battery is fully charged or exceeds a predetermined value. A process is executed.

  Further, in the charging device according to the invention of claim 3, the first determination means determines whether or not the voltage of the battery in the charging order 1 exceeds the voltage of the battery in the charging order 2 or more, or It is determined whether or not the battery of the charging rank 1 battery is fully charged, and the charging control means uses the first determination means to set the voltage of the charging rank 1 battery to the voltage of the charging rank 2 battery. When it is determined that the battery has exceeded a predetermined level, or when it is determined that the battery of the charging rank 1 is fully charged, the rank determining means is operated again.

  Further, in the charging device according to the invention of claim 4, the order determining means includes a detecting means for detecting a voltage at the start of charging of each battery, and each of the voltages detected by the detecting means. Determining means for determining the charging order in ascending order.

  In the charging device according to the invention described in claim 5, the voltages at the time of full charge of the plurality of batteries are the same.

  Moreover, in the charging device according to the invention of claim 6, the rank determining means includes a detecting means for detecting a voltage at the start of charging of each battery, and a voltage of each battery detected by the detecting means. A calculating means for calculating a ratio of each battery to a voltage when fully charged, and a determining means for determining the charging order based on the ratio calculated by the calculating means.

  In the charging device according to the seventh aspect of the present invention, the determining unit determines the order of charging in ascending order of the ratio calculated by the calculating unit.

  Moreover, in the charging device according to the invention described in claim 8, voltage values at the time of full charge of the respective batteries are different from each other.

  In the charging apparatus according to the ninth aspect of the present invention, the order determination means includes a detection means for detecting a voltage at the start of charging of each battery, and a battery for each battery detected by the detection means. And determining means for determining the charging order based on a voltage and a magnitude of a load connected to each of the batteries.

  Moreover, in the charging device according to the invention of claim 10, the determination unit is configured such that, in each of the batteries, the ratio of the magnitude of the voltage detected by the detection unit to the magnitude of the connected load. It is characterized by comprising a calculation means for calculating.

  In the charging device according to an eleventh aspect of the present invention, the determining unit determines the order in which the charging is performed in ascending order of the ratio calculated by the calculating unit.

  In the charging device according to the twelfth aspect of the present invention, the load connected to each of the batteries is different in size.

  Moreover, in the charge control program according to the invention of claim 13, a computer having a charging device for charging a plurality of batteries is detected by detecting the voltage of each battery, and based on the detected voltage of each battery, Order determining means for determining at least first and second order charging orders, charging means for charging a battery of charge order 1 determined by the order determining means, and batteries of charge order 1 charged by the charging means The first judging means for judging whether or not the voltage of the battery of the charging order 2 has exceeded the voltage of the charging order 2 and the first judging means, the voltage of the battery of the charging order 1 is When it is determined that the voltage has exceeded a predetermined value or more, the order determining means is caused to function as a charge control means for re-operation.

  The charging method according to the invention of claim 14 is a charging method in a charging device for charging a plurality of batteries, wherein the voltage of each battery is detected and based on the detected voltage of each battery. A rank determination step of determining at least the first and second ranks of charge, a charging step of charging a battery of charge rank 1 determined by the rank determination step, and the charge rank of 1 charged by the charging step A determination step of determining whether or not the voltage of the battery exceeds a predetermined voltage of the battery of charging rank 2; and by this determination step, the voltage of the battery of charging rank 1 exceeds the predetermined voltage of the battery of charging rank 2 And a charge control step of re-executing the rank determination step when it is determined that the order has been determined.

  According to the present invention, the current voltages of a plurality of batteries are repeatedly detected, the charging order is determined each time this current voltage is detected, and the batteries of the charging order 1 are charged sequentially, so that the required battery level is charged early. It becomes possible to do.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a block diagram showing an electrical configuration of a projector 1 common to the embodiments of the present invention. The projector 1 operates using a rechargeable battery unit 29 as a power source, and includes a battery charging circuit 33, a voltage detection circuit 28, a control unit 11, an input / output interface 12, an image conversion unit 13, a display encoder 14, and a display. It has a drive unit 15 and the like.

  The battery unit 29 is composed of a first battery 291, a second battery 292, a third battery 293, and a fourth battery 294 that are provided independently, and each of these batteries 291 to 294 supplies power to each part of the projector 1. Supply. The battery charging circuit 33 is connected to an AC power source, converts AC current into DC current, and charges the first to fourth batteries 291 to 294 individually as will be described later. , A circuit for detecting voltages of the first to fourth batteries 291 to 294. The control unit 11 detects the remaining battery levels of the first to fourth batteries 291 to 294 based on the voltage detected by the voltage detection circuit 28.

  On the other hand, image signals (image data) of various standards input from the input / output connector unit 16 are unified into image signals of a predetermined format suitable for display by the image conversion unit 13 via the input / output interface 12 and the system bus 17. Then, it is sent to the display encoder 14. The display encoder 14 develops and stores the transmitted image signal in the video RAM 18, generates a video signal from the stored contents of the video RAM 18, and outputs the video signal to the display driving unit 15.

  The display driving unit 15 to which the video signal is input from the display encoder 14 drives the display element 19 which is a spatial light modulation element (SOM) at an appropriate frame rate in accordance with the transmitted image signal. Then, the light bundle emitted from the light source device 20 having a lamp is incident on the display element 19 through the light source side optical system, thereby forming an optical image with the reflected light of the display element 19, and the projection side optical system. An image is projected and displayed on a screen (not shown) through the movable lens group 21. The movable lens group 21 of the projection side optical system is driven by a lens motor 22 for zoom adjustment and focus adjustment. The light source device 20 includes an R-LED 20R that emits R (red) light, a G-LED 20G that emits G (green) light, and a B-LED 20B that emits B (blue) light.

  The image compression / decompression unit 23 performs recording processing for compressing the luminance signal and the color difference signal in the image signal by processing such as ADTC and Huffman coding, and writing the data onto a memory card 24 that is a detachable recording medium. The image data recorded in the memory card 24 is read out, the individual image data constituting a series of moving images is expanded in units of one frame, sent to the display encoder 14 via the image conversion unit 13, and stored in the memory card 24. Based on the above, it is possible to display a moving image or the like.

  The control unit 11 controls the operation of each circuit in the projector 1, and includes a CPU and its peripheral circuits, a ROM 111, a RAM 112, and the like. The ROM 111 stores programs such as various settings, programs and data shown by flowcharts described later, and the RAM 112 is used as a work memory or the like.

  In addition, an audio processing unit 30 is connected to the control unit 11 via a system bus 17, and the audio processing unit 30 includes a sound source circuit such as a PCM sound source, and converts audio data into analog data in the projection mode and the playback mode. The loudspeaker 31 can be driven to emit loud sounds.

  The key / indicator unit 25 includes a main key and an indicator provided in a main body case or the like, a lamp that is turned on when the projector 1 is activated, a display unit, and the like. These indicators and the like are displayed and blinked by the control unit 11, and operation signals for various keys are sent to the control unit 11. The key operation signal from the remote controller is received by the Ir receiver 26, demodulated by the Ir processor 27, and the code signal is sent to the controller 11. The control unit 11 controls the light source control circuit 32 to control the R-LED 20R, the G-LED 20G, and the B-LED 20B in a time-sharing manner according to the image signal.

  In the present embodiment, the first battery 291 is connected to the R-LED 20R, the second battery 292 is connected to the G-LED 20G, the third battery 263 is connected to the B-LED 20B, and the fourth battery 294 is connected to the system. Power is supplied as a load. The system means the entire projector 1 excluding the R-LED 20R, the G-LED 20G, and the B-LED 20B. In the first embodiment, it is desirable that the voltage values of the batteries 291 to 294 when fully charged are the same.

  In the first embodiment having the above configuration, the control unit 11 of the projector 1 executes processing as shown in the flowchart of FIG. 2 based on a program stored in the ROM 111 when the power is turned on. That is, the battery charging circuit 33 is activated to sequentially test-charge the batteries 291 to 294, and the voltage detection circuit 28 is activated to charge voltage values (current voltages) that are current voltages of the batteries 291 to 294. ) Is measured (step SA1). Then, the measured charging voltage values of the batteries 291 to 294 are stored in the RAM 112 (step SA2).

  Further, the charging voltage values of the batteries 291 to 294 stored in the RAM 112 are compared to determine the charging order (step SA3). In the present embodiment, the charging order is the order in which the charging voltage value is low. Therefore, the battery with the lowest charge voltage value is determined as rank 1, and the battery with the next lowest charge voltage value is determined as rank 2.

  The determination of the charging order in step SA3 may be performed by determining at least the ranks 1 and 2 in the four batteries 291 to 294, but the ranks 1 to 4 may all be determined.

  Next, the main charging is started from the battery of rank 1, that is, the main charging is started from the battery having the lowest charging voltage value at the present time (step SA4). Further, the voltage detection circuit 28 detects the charging voltage value of the first rank battery starting the main charging, and sets this as V1, and the charging voltage value V1 of the first rank battery is “battery charging voltage value of the second rank”. + Α ”, that is, if the battery charge voltage value of rank 2 is V2, it is determined whether V1 = V2 + α or whether the battery is fully charged (step SA5).

  Then, the main charging (step SA4) is continued until the determination in step SA5 becomes YES, and if the charging voltage value V1 becomes “V2 + α” or becomes full charging and YES, charging is performed. At the same time, the battery charge voltage value of rank 1 stored in the RAM 112 is updated (step SA6). Accordingly, the battery charge voltage value V1 of rank 1 stored in the RAM 112 is updated to “V2 + α” or “full charge”.

  Therefore, based on the charging voltage values of the batteries 291 to 294 stored in the RAM 112 and updated in step SA6, it is determined whether or not all the batteries are fully charged (step SA7). Then, the loop of steps SA3 to SA7 is repeated until all the batteries are fully charged.

  Therefore, the battery having the lowest charging voltage value is charged by the processing in steps SA3 to SA7, and this charging is performed when the charging voltage value V2 of the next lowest charging voltage value exceeds α or more. Stopped at the time of overtaking charging. Further, by repeating the loop of steps SA3 to SA7, the battery having the lowest charge voltage value is sequentially charged until the charge voltage value becomes “V2 + α”.

  Therefore, in each of the batteries 291 to 294, the battery with the lowest charging voltage value is sequentially overcharged until it becomes “V2 + α”. At this time, since the full charge amount of each of the batteries 291 to 294 is the same, the battery with the lowest charge voltage value is sequentially charged until it reaches “V2 + α”. Regardless of the difference, the batteries 291 to 294 are charged so that the charging rate is uniform, and as a result, it is possible to charge each of the batteries 291 to 294 to the required remaining battery level at an early stage.

  When all of the batteries 291 to 294 are fully charged by repeating the loop of steps SA3 to SA7, the charging is terminated and the batteries 291 to 294 are connected to the loads described above. The process according to is terminated.

  In the present embodiment, the charging is terminated when all the batteries are fully charged according to the determination in step SA7. However, the charging is performed when all the batteries reach a predetermined charging amount. May be terminated. Thereby, the connection switching to each load can be performed at an early stage, and the use of the projector 1 can be started at an early stage.

(Second Embodiment)
FIG. 3 is a flowchart showing a processing procedure in the second embodiment of the present invention. In the second embodiment, it is desirable that the full voltage values, which are voltage values when the batteries 291 to 294 are fully charged, are different from each other.

  That is, the battery charging circuit 33 is activated to sequentially test-charge the batteries 291 to 294, and the voltage detection circuit 28 is activated to charge voltage values (current voltages) that are current voltages of the batteries 291 to 294. ) Is measured (step SB1). Then, the measured charging voltage values of the batteries 291 to 294 are stored in the RAM 112 (step SB2).

  Further, based on the charging voltage value of each battery 291 to 294 stored in the RAM 112 and the full voltage value, a voltage ratio that is a ratio of the current voltage to the full voltage value of each battery 291 to 294 is calculated, for example, as a percentage. At the same time, the calculated voltage ratio is stored in the RAM 112 (step SB3). Further, the charging order is determined based on the voltage ratio of each of the batteries 291 to 294 stored in the RAM 112 (step SB4). In the present embodiment, the charging order is the order in which the voltage ratio is low. Therefore, the battery with the lowest voltage ratio is determined as rank 1, and the battery with the next lowest voltage ratio is determined as rank 2.

  It should be noted that, in the determination of the charging order in step SB4, at least the ranks 1 and 2 may be determined in the four batteries 291 to 294, but all the ranks 1 to 4 may be determined.

  Next, the main charge is started from the battery of rank 1, that is, the main charge is started from the battery having the lowest voltage ratio at the present time (step SB5). Further, it is determined whether or not the voltage ratio of the rank 1 battery that has started the main charge is “voltage ratio + rank of rank 2 + α” or whether the battery is fully charged (step SB6).

  Then, the main charge (step SB5) is continued until the determination in step SB6 becomes YES, and the voltage ratio becomes “voltage ratio of rank 2 + α” or full charge (voltage ratio = 100%). If YES, the charging is stopped and the voltage ratio in the battery of rank 1 stored in the RAM 112 in step SB3 is updated (step SB7). Therefore, the voltage ratio of the battery of rank 1 stored in the RAM 112 is updated to “voltage ratio of rank 2 + α” or “full charge”. “Α” may be either% or a voltage value.

  Therefore, based on the voltage ratio of the batteries 291 to 294 stored in the RAM 112 and updated in step SB7, it is determined whether or not all the batteries are fully charged (step SB7). Then, the loop of steps SB4 to SB8 is repeated until all the batteries are fully charged.

  Therefore, by the processing in steps SB4 to SB8, the battery having the lowest voltage ratio is charged, and this charging is performed when the voltage ratio of the battery having the next lowest voltage ratio is exceeded by α or more (overtaking charging is performed). Is stopped at the time. In addition, by repeating the loop of steps SB4 to SB7, the battery having the lowest voltage ratio is sequentially charged until the voltage ratio becomes “voltage ratio of rank 2 + α”.

  Therefore, in each of the batteries 291 to 294, the battery with the lowest voltage ratio is sequentially overcharged until it reaches the “rank 2 voltage ratio + α”. For this reason, even if the full charge amount (full voltage value) of each of the batteries 291 to 294 is different, the battery 291 is sequentially charged until the battery having the lowest voltage ratio becomes “the voltage ratio of rank 2 + α”. ˜294 are charged so that the charging rate is uniform, and as a result, each of the batteries 291 to 294 can be charged to the required remaining battery level at an early stage.

  Then, by repeating the loop of steps SB4 to SB8, when all the batteries 291 to 294 are fully charged, the charging is terminated and the batteries 291 to 294 are connected and switched to the loads described above. The process according to is terminated.

(Third embodiment)
FIG. 4 is a flowchart showing a processing procedure in the third embodiment of the present invention. In the third embodiment, the full voltage values, which are the voltage values when the batteries 291 to 294 are fully charged, may be the same or different from each other.

  That is, the battery charging circuit 33 is activated to sequentially test-charge the batteries 291 to 294, and the voltage detection circuit 28 is activated to charge voltage values (current voltages) that are current voltages of the batteries 291 to 294. ) Is measured (step SC1). Then, the measured charging voltage values of the batteries 291 to 294 are stored in the RAM 112 (step SC2).

Moreover, the charging voltage value between each battery 291-294 memorize | stored in this RAM112 is compared, and the ratio (charging voltage ratio) of the charging voltage value of each battery is calculated by ratio, for example (step SC3). Thereby, for example, the charging voltage ratio of the first to fourth batteries 291 to 234 is calculated as a ratio as described below.
Charging voltage ratio = 1: 2: 3: 4: battery = 1: 2: 3: 4

Next, the ratio (load ratio) of the magnitude of the load connected to the first to fourth batteries 291 to 294 is calculated (step SC4). Here, as described above, the first battery 291 uses the R-LED 20R, the second battery 292 uses the G-LED 20G, the third battery 293 uses the B-LED 20B, and the fourth battery 294 uses the system as a load. Therefore, for example, as described below, the load ratio of each of these loads is calculated as a ratio.
Load ratio = 20R: 20G: 20B: System = 2: 3: 3: 5

Further, in each battery, the ratio (ratio ratio) of the charging voltage ratio to the load ratio is calculated and stored in the RAM 112 (step SC5).
That is, in this example, as described above, (1) charge voltage ratio = first: second: third: fourth battery = 1: 2: 3: 4
(2) Load ratio = R-LED: G-LED: B-LED: System = 2: 3: 3: 5
The connection relationship between the battery and the load is (a) the first battery: R-LED
(B) Second battery: G-LED
(C) Third battery: B-LED
(D) Fourth battery: Since this is a system, the following ratio ratio, which is the ratio of the ratio of the magnitude of the load connected to each battery to the ratio of the charging voltage value of each battery, is calculated. .
(A) 1st battery = 1/2 = 0.5
(B) 2nd battery = 2/3 = 0.67
(C) 3rd battery = 3/3 = 1
(D) 4th battery = 4/5 = 0.8
This value indicates whether the amount of charge of the battery is an appropriate value with respect to the size of the load connected to the battery. The smaller the value, the less the amount of charge for the connected load. It is in a state and indicates a state that requires immediate charge.

  Furthermore, a charging order is determined based on these ratios (step SC6). In the present embodiment, the charging order is the order in which the ratio ratio is small. Accordingly, the first battery 291 having the smallest ratio ratio of “0.5” is determined as rank 1, and the second battery 292 having the next ratio ratio “0.67” is determined as rank 2.

  In addition, in the determination of the charging order in step SC4, at least the ranks 1 and 2 may be determined in the four batteries 291 to 294, but all the ranks 1 to 4 may be determined.

  Next, the main charge is started from the battery of rank 1, that is, the main charge is started from the battery having the smallest ratio at the present time (step SC7). Further, it is determined whether or not the ratio ratio of the first rank battery that has started the main charge is “ratio ratio of the second rank + α”, or whether or not the battery is fully charged (step SC8).

  Then, the main charge (step SC7) is continued until the determination in step SC8 becomes YES, and if the ratio becomes “ratio 2 of rank 2 + α” or if full charge occurs and becomes YES. The charging is stopped, and the ratio of the rank 1 batteries stored in the RAM 112 in step SC5 is updated (step SC9). Therefore, the ratio ratio of the rank 1 batteries stored in the RAM 112 is updated to “rank ratio 2 ratio + α” or “full charge”. Next, it is determined whether or not all the batteries are fully charged (step SC10), and the loop of steps SC6 to SC10 is repeated until all the batteries are fully charged.

  Therefore, by the processing in steps SC6 to SC10, the battery having the smallest ratio is charged, and this charging is performed when the ratio ratio of the battery having the next smallest ratio is exceeded by α or more (overtaking charging). Is stopped at the time. Further, by repeating the loop of steps SC6 to SC10, charging is sequentially repeated until the ratio ratio becomes “ratio ratio 2 of rank 2 + α” for the battery having the smallest ratio ratio.

  Therefore, in each of the batteries 291 to 294, the battery with the smallest ratio is sequentially overcharged until it reaches the "rank ratio 2 ratio ratio + α". For this reason, even if the full charge amount (full voltage value) of each of the batteries 291 to 294 is different, the battery with the smallest ratio ratio is sequentially charged until the ratio of the rank 2 becomes the ratio ratio + α. 294 is charged so that the charging rate is uniform in relation to the load, and as a result, each of the batteries 291 to 294 can be charged to the required remaining battery level at an early stage.

  When all the batteries 291 to 294 are fully charged by repeating the loop of steps SC6 to SC10, the charging is terminated and the batteries 291 to 294 are connected and switched to the loads described above. The process according to is terminated.

(Fourth embodiment)
FIG. 5 is a flowchart showing a part of the processing procedure in the fifth embodiment of the present invention. That is, in step SD1 following steps SA6, SB7, and SC9 in the first to third embodiments described above, it is determined whether or not the charge amounts of all the batteries 291 to 294 have exceeded a predetermined value. If not, the process returns to steps SA3, SB4, and SC6 in the first to third embodiments.

  When the charge amount of all the batteries 291 to 294 exceeds a predetermined value, the process proceeds to normal charging (step SD2). Here, normal charging is charging by any of the known charging methods other than the charging shown in the first to third embodiments described above, such as charging by the charging method described in Patent Document 1 described above. is there. In charging by the charging method described in Patent Document 1, when charging each of the batteries 291 to 294, after charging the first battery 291 for a certain period of time, the charging to the next third battery 292 is performed at the same time. Charge the battery. Charging the batteries 291 to 294 with this fixed time is defined as a charging cycle T, and the charging cycle T is repeated until all the batteries 291 to 294 are fully charged.

  When all the batteries 291 to 294 are fully charged by repeating the normal charging with the charging cycle T, the charging is terminated and the batteries 291 to 294 are connected and switched to the loads described above. The process according to is terminated.

  Therefore, according to the fourth embodiment, when the determination in step SD1 is YES and the charge amount of all the batteries 291 to 294 exceeds a predetermined value, the charge voltage value of each battery is measured. Since there is no need to do this, the processing can be facilitated.

  In the fourth embodiment, the charging is terminated when all the batteries are fully charged. However, in step SD1, whether all the batteries have exceeded the first predetermined value or not is determined. In SD3, it is determined whether or not all the batteries have exceeded the second predetermined value (however, the first predetermined value <the second predetermined value), and the charging is terminated when the batteries exceed the second predetermined value. It may be.

  Moreover, in the above-mentioned embodiment, although the case where the battery was four was shown, as long as it is plural, it may be how many. Furthermore, although the case where the present invention is applied to a projector has been described in the above-described embodiment, it is needless to say that the present invention can be applied to various electronic devices that operate using a battery as a power source without being limited to the projector.

1 is a block diagram showing a circuit configuration of a projector according to an embodiment of the present invention. It is a flowchart which shows the process sequence in the 1st Embodiment of this invention. It is a flowchart which shows the process sequence in the 2nd Embodiment of this invention. It is a flowchart which shows the process sequence in the 3rd Embodiment of this invention. It is a flowchart which shows a part of process sequence in the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector 11 Control part 19 Display element 20 Light source device 20B B-LED
20G G-LED
20R R-LED
DESCRIPTION OF SYMBOLS 21 Movable lens group 22 Lens motor 23 Image compression / decompression part 28 Voltage detection circuit 29 Battery unit 33 Battery charging circuit 111 ROM
112 RAM

Claims (14)

A charging device for charging a plurality of batteries,
Rank determining means for detecting the voltage of each battery and determining at least the first and second charge ranks based on the detected voltage of each battery;
Charging means for charging the battery of the charging order 1 determined by the order determining means;
First judging means for judging whether or not the voltage of the battery of the charging order 1 charged by the charging means exceeds a predetermined voltage or more by the voltage of the battery of the charging order 2;
When the first determination means determines that the voltage of the battery of charge rank 1 exceeds the voltage of the battery of charge rank 2 by a predetermined level or more, charging control means is provided for restarting the rank determination means. Charging device. A second determining means for determining whether or not each battery is fully charged, or whether or not the voltage of each battery exceeds a predetermined value;
The charge control means executes a charge termination process without restarting the order determination means when the second determination means determines that each of the batteries is fully charged or exceeds a predetermined value. The charging device according to claim 1. The first determination means determines whether or not the voltage of the battery in the charging order 1 exceeds the voltage of the battery in the charging order 2 or more, or whether or not the battery of the battery in the charging order 1 is fully charged. Judgment
The charging control means may determine that the first judging means determines that the voltage of the battery having the charging order 1 exceeds the voltage of the battery having the charging order 2 by a predetermined value or the battery of the battery having the charging order 1 is full. 2. The charging apparatus according to claim 1, wherein when it is determined that charging has been performed, the rank determining unit is reactivated. The rank determining means includes
Detecting means for detecting a voltage at the start of charging of each battery;
4. The charging apparatus according to claim 1, further comprising a determining unit that determines the charging order in descending order of the voltages detected by the detecting unit.   The charging device according to claim 4, wherein voltages of the plurality of batteries when fully charged are the same. The rank determining means includes
Detecting means for detecting a voltage at the start of charging of each battery;
Calculating means for calculating the ratio of the voltage of each battery detected by the detecting means to the voltage when each battery is fully charged;
The charging device according to claim 1, further comprising a determining unit that determines the charging order based on the ratio calculated by the calculating unit.   The charging device according to claim 6, wherein the determining unit determines the order of charging in ascending order of the ratio calculated by the calculating unit. The charging device according to claim 6 or 7, wherein the voltage value of each battery when fully charged is different. The rank determining means includes
Detecting means for detecting a voltage at the start of charging of each battery;
2. A determination means for determining the charging order based on the voltage of each battery detected by the detection means and the magnitude of a load connected to each battery. The charging device according to 2 or 3.   The said determination means is provided with the calculation means which calculates the ratio with respect to the magnitude | size of the said load connected with the magnitude | size of the voltage detected by the said detection means in each said battery. Charging device.   The charging device according to claim 10, wherein the determining unit determines an order in which the charging is performed in ascending order of the ratio calculated by the calculating unit.   The charging device according to claim 9 or 11, wherein the loads connected to the batteries have different sizes. A computer having a charging device for charging a plurality of batteries;
Rank determining means for detecting the voltage of each battery and determining at least the first and second charge ranks based on the detected voltage of each battery;
Charging means for charging the battery of the charging order 1 determined by the order determining means;
First judging means for judging whether or not the voltage of the battery of the charging order 1 charged by the charging means exceeds a predetermined voltage or more by the voltage of the battery of the charging order 2;
When it is determined by the first determination means that the voltage of the battery with the charging order 1 exceeds the voltage of the battery with the charging order 2, the order determining means is made to function as a charge control means for re-operation. Charge control program. A charging method in a charging device for charging a plurality of batteries,
A rank determination step of detecting the voltage of each battery and determining at least the first and second charge ranks based on the detected voltage of each battery;
A charging step of charging the battery of the charging order 1 determined by the order determination step;
A determination step of determining whether or not a voltage of the battery in the charging order 1 charged by the charging step exceeds a predetermined voltage or more by a voltage of the battery in the charging order 2;
A charging control step of re-executing the order determination step when the determination step determines that the voltage of the battery of the charging order 1 exceeds the voltage of the battery of the charging order 2 by a predetermined value or more. Method.

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