JPS628088A - Combined battery checking system for radiation dosimeter - Google Patents

Abstract

PURPOSE:To facilitate the protection of a radiation dosimeter by quickly detecting that an abnormality is generated in one cell of a combined battery. CONSTITUTION:Voltage setting means 72 set voltage signals from the time just after the charging of a combined battery 1 is terminated every predetermined time via an A/D converter 4. Voltage comparing and deciding means 73 compare a reference charging voltage V0 from voltage memory means 74 and a value VT1 set to the means 72 with each other and, when VT1<=V0, decide an abnormality to operate a lamp 10 and a buzzer 11 via an output circuit 8, generating an alarm. On the other hand, when VT1>V0, the means 73 judge a normality and supply the set value VT1 to the means 74 to update the content thereof. Then, a control signal is outputted from time storing means 71 to the means 73, a deviation between the value of voltage set to the means at this time and the value VT1 stored in the means 74 is obtained and the abnormality of one cell is detected by comparing the deviation with a predetermined reference value. Thus, by quickly detecting the abnormality of the one cell of a storage battery, troubles, such as the measurement incapability of a radiation dose, the disappearance of dose data and the like, can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for checking an assembled battery in a radiation dosimeter.

[Conventional technology]

Generally, a combination of multiple storage batteries in series (battery assembly) is used as a power source for a radiation dosimeter. By the way, if there is a defect such as an internal short circuit in one cell of such an assembled battery, the voltage may not rise to the specified level even if it is charged with a charger, or it may not be possible to discharge under a steady load condition.
However, the voltage drops abnormally, and as a result, part of the discharge amount by the normal cells is consumed by reverse charging of the defective cells, resulting in the normal cells going down.

Therefore, conventionally, a predetermined detection circuit has been provided to monitor the battery voltage during use.

FIG. 4 is a reference diagram for explaining such a conventional method.
It is a graph showing the discharge characteristics of an assembled battery.

That is, as long as the battery is normal, discharging will occur as shown in the figure (2), but if one cell becomes defective, the voltage will change as shown in the dotted line (2). Therefore, by selecting a value slightly lower than the dotted line ■ as the set value and comparing this with the separately detected assembled battery voltage, it is possible to detect that an abnormality has occurred in one of the storage batteries that make up the assembled battery. I have to. In addition, V
LL represents the minimum voltage level at which the dosimeter can operate normally, and the above set value is set between this level VLI and the voltage level (2) (see vL).

[Problem that the invention seeks to solve]

When the set level is set to vL as described above, an abnormality is detected near the time t1 immediately before the level falls below the limit level VLL. That is, ~ As shown in the figure, there is usually a considerable margin of time between when one cell goes down (see time t) and when the voltage drops below the VLL level. Therefore, if an abnormality could be detected immediately after one cell goes down, appropriate countermeasures could be easily taken, but with the method described above, it is detected just before it drops below the limit level VLL, so no manual intervention is required. That is to say, there is nothing that can be done. That is, time t. If you continue to use the battery without knowing that one of the assembled batteries has gone down in the vicinity, the battery will eventually wear down, as shown by the dotted line ■ in the same figure (other cells will also go down, and the battery will drop below the VLL level). ,
Not only will the circuit operation stop and radiation dose measurement become impossible, but it will also become impossible to generate an abnormality alarm.

In the worst case, radiation dose data will be lost.
This means that it will no longer be able to function as a dosimeter.

Therefore, it is an object of the present invention to easily and reliably protect a dosimeter by quickly detecting the occurrence of an abnormality in one cell of an assembled battery.

[Means for solving problems]

A setting means for reading and setting a voltage signal immediately after charging of the assembled battery is completed at predetermined time intervals, a storage means for storing a predetermined value as an initial value and an output from the setting means, and a storage means for storing the output from the setting means; Comparison/determination means is provided for sequentially comparing and determining the output with the output of the setting means.

[Effect]

FIG. 1 is a main diagram that best represents the features of this invention. In the figure, 1 is an assembled battery, 2 is a charging terminal, 6 is a voltage converter, 4 is an analog/digital (A/D) converter,
8 is an output circuit, 9 is a display, 10 is a lamp, 11 is a buzzer, 70 is a charge detection means, 71 is a time storage means, 72 is a voltage setting means, 73 is a voltage comparison/judgment means, and 74 is a voltage storage means. be.

When a charger (not shown) is connected to the charging terminal 2 in order to charge the assembled battery 1, the voltage converter 3 receives a voltage signal from the charger, converts it into an appropriate signal, and starts charging. It is output to the detection means 70. The charge detection means 70 resets the time storage means 71 by the signal from the voltage converter 3, and stops the battery check function. In this way, battery 1
Charging is performed.

Next, when the battery 1 is completely charged and disconnected from the charger, the time storage means 71 is released from the reset state, so that the voltage setting means 72 and the voltage comparison
A control signal for operating the determining means 76 is output.

The voltage setting means 72 sets the voltage signal from the A/D converter 4 at predetermined time intervals. The voltage comparison/judgment means 73 sequentially inputs the comparison values from the voltage storage means 74 and sequentially compares them with the setting value set in the voltage setting means 72 to make a judgment. Note that the voltage storage means 74 stores the battery voltage (
Various reference (setting) data including comparison voltage data corresponding to voltage data (see Vo in FIG. 4) are stored.

Therefore, the setting value initially set in the setting means 72 is compared with reference data corresponding to Vo stored in the voltage storage means 74, thereby checking whether or not charging is being performed normally. In other words, if the battery 1 is not properly charged, the battery voltage will be low and the usage time will be shortened, so this check is to prevent such troubles. Note that the value of vO is appropriately selected depending on the minimum required charge amount and the load characteristics of the dosimeter. As a result of the comparison between this voltage reference value VO and the set value VT1 in the means 72, if VT1≦vO, it is determined that there is an abnormality, and the lamp 10 and the buzzer 11 are activated via the output circuit 8 to issue an alarm.
If VO is normal, it is set and 9 VT1 is stored in the voltage storage means 7.
4 to update the memory contents.

Next, when a control signal is output from the time storage means 71,
Since the voltage value at that time is set in the means 72, the means 7
3, this value VT2 and the value VT stored in the means 74
By determining the deviation from 1 and comparing this deviation with a predetermined reference value a, an abnormality in one cell is detected. therefore,
The reference value a is selected to correspond to the voltage drop value based on the abnormality of one cell.

In this case, for example, amo, 8 is used. In other words, if VTl - VT2≧Q, 8, it is determined that one cell is abnormal, and the lamp 10 and buzzer 11 are operated via the output circuit 8, while VTl - VT
If 2 < 0.8, it is determined to be normal and the stored value of the means 74 is updated to VT2. Repeat the above operations at predetermined time intervals,
The set value vT set in the means 72 is VT≦O, S+V.

When this happens, the check operation should be stopped.

In other words, if another cell goes down at this point, it will drop below the minimum level VLL, so this is to prevent this.

〔Example〕

FIG. 2 is a block diagram showing an embodiment of the present invention.

In the figure, 5 is a radiation detector, 6 is an amplifier, and 7 is an input port door 5. Random access memory (RAM) 76
, a central processing unit (CPU) 77, a read-only memory (ROM) 78, an output port door 9, etc., is a processing device such as a micro combinator.
It is similar to the figure.

FIG. 3 is a flowchart for explaining the operation of the processing device in FIG. 2. The operation will be explained below with reference also to FIG.

The CPU 77 stops operating during charging, so when the program starts, it first determines whether charging is in progress (
(See Figure 3 ■), wait until the charging signal disappears. If there is no charging signal, the CPU 77 resets the contents of the RAM 76 (see ■), then reads the voltage VT1 (
), and comparison with the set value vO stored in the ROM 78.

Make a judgment (same ■ Gyosho). As a result, if VT1≦■0, it is assumed that battery 1 is not being charged normally.
Activate the lamp 10 and buzzer 11 to issue an alarm (
(See same).

On the other hand, if VTl>VO, assuming that battery 1 is normally charged, R
The voltage value VTI is stored in AM75 (see ①). Next, after waiting for a predetermined sampling time (T) to arrive (see item 2), the next voltage value VT2 is read (see item 2). Then, it is determined that VTl - VT2 ≧0.8, and if the above formula is satisfied, it is assumed that one cell is down, and the lamp 10 and buzzer 11 are activated to issue an alarm (diagnosis), while the above formula If not satisfied, VT2 is set as the stored value (see same [phase]) and the stored contents are updated. Therefore, the previous voltage value (VT) i−
As long as the deviation between 1 and the current value (vT)i is (VT)i-1(VT)i(0,8), the stored values are updated sequentially at a predetermined period (T), and (VT) When t-1(VT)i≧0.8, one cell is detected to be down and an alarm is issued.

In addition, the current value (VT)i of the voltage value is (VT)i≦0.8+VI.

It is also determined whether the above equation is satisfied, and the comparison 2 determination operation is stopped to prevent the battery voltage from falling below the lowest level VLL.

〔Effect of the invention〕

According to this invention, it is possible to quickly detect an abnormality in one storage battery cell and issue an alarm, thereby preventing troubles such as inability to measure radiation dose or loss of radiation dose data. As a result, the reliability of the dosimeter is significantly improved. Furthermore, in addition to such a function, a charging failure of the assembled battery is also detected, so that reliability can be further improved.

[Brief explanation of drawings]

Figure 1 is the main diagram that best represents the features of this invention;
3 is a block diagram showing an embodiment of the present invention, FIG. 3 is a flowchart for explaining the operation of the processing device in FIG. 2, and FIG. 4 is a graph showing the discharge characteristics of the power source. Code explanation 1... Assembled battery, 2... Charging terminal, 3.
...Voltage converter, 4...A/D converter,
5...Detector, 6...Amplifier, 7...
...Processing device, 8...Output circuit, 9...
...Indicator, 10...Lamp, 11...
...Buzzer, 70... Charging detection means, 71...
. . . Time storage means, 72 . . . Voltage setting means,
73... Voltage comparison/judgment means, 74...
・Voltage storage means, 75... Input board, 76.
...RAM, 77...CPU, 78...
...ROM. 79... Output port.

Claims (1)

[Claims] In a radiation dosimeter that measures radiation dose using a plurality of storage batteries (battery packs) combined in series as a power source, a setting means for reading and setting a voltage signal immediately after the completion of charging of the battery pack at predetermined time intervals; A storage means for storing at least a predetermined value as an initial value and an output from the setting means, and a comparison/determination means for sequentially comparing and determining the output of the storage means and the output of the setting means, The initial value of the assembled battery voltage is checked by comparing the setting value initially set in the setting means with the initial value, and if this is normal, the initial setting value is memorized, and then this stored value and the next The deviation from the set value is compared with the standard value, and if the standard value is not reached, the set value is memorized in sequence, and when the deviation exceeds the standard value, an abnormality has occurred in one of the assembled batteries. A method for checking assembled batteries in radiation dosimeters, which is characterized by detecting