JPH0122104Y2

JPH0122104Y2 -

Info

Publication number: JPH0122104Y2
Application number: JP5102682U
Authority: JP
Priority date: 1982-04-07
Filing date: 1982-04-07
Publication date: 1989-06-29
Also published as: JPS58154430U

Description

【考案の詳細な説明】本考案は電源モード切替式はかりに関し、その
目的とするところはバツテリ駆動モード時の節電
を図ることにある。[Detailed Description of the Invention] The present invention relates to a power mode switching scale, and its purpose is to save power during battery drive mode.

最近、電子式はかり〔設定された単価から演算
して被計量物価格を表示する電子式料金はかりを
含む〕では回路のＣ−MOS化が進み、低消費電
力で動作するようになつている。そのため電源も
商用電源だけでなくバツテリでも使用できるよう
になつている。第１図は従来の電子式はかりの構
成を示す。１は荷重変換器、２は荷重変換器１出
力を読み込んでデジタル変換するはかり本体、３
ははかり本体２の出力するデジタル信号を測定重
量値としてデジタル表示する表示回路、４は電源
供給ライン、５はバツテリ、６は商用電源接続用
プラグ、７は電源スイツチ、８は降圧用トラン
ス、９は整流平滑回路、１０は電源モードの選択
スイツチである。 Recently, electronic scales (including electronic price scales that display the price of the object to be weighed by calculating from a set unit price) have been increasingly equipped with C-MOS circuits, which allow them to operate with low power consumption. Therefore, it is now possible to use not only commercial power but also battery power. FIG. 1 shows the configuration of a conventional electronic scale. 1 is a load converter, 2 is a scale body that reads the output of the load converter 1 and converts it into digital data, 3
A display circuit that digitally displays the digital signal output from the scale body 2 as a measured weight value, 4 is a power supply line, 5 is a battery, 6 is a plug for connecting to a commercial power supply, 7 is a power switch, 8 is a step-down transformer, 9 1 is a rectifying and smoothing circuit, and 10 is a power mode selection switch.

しかし、前記表示回路３は螢光表示管や第２図
に示すように発光ダイオード表示器を主要素子と
しており、表示回路３の電力消費量は全体消費電
力の1/2以上を占めているのが現状である。第２
図は７セグメントの発光ダイオード表示器DP₁〜
DP₅がダイナミツク駆動されており、Ａは桁セレ
クト信号出力、Ｂは７セグメント出力、Tr₁〜
Tr₅はアノードスイツチング用トランジスタ、
Tr₁₀〜Tr₇₀はセグメントスイツチング用トラン
ジスタ、１１は電流制限用抵抗器である。 However, the display circuit 3 mainly uses a fluorescent display tube or a light emitting diode display as shown in FIG. 2, and the power consumption of the display circuit 3 accounts for more than half of the total power consumption. is the current situation. Second
The figure shows a 7-segment light emitting diode display DP ₁ ~
DP ₅ is dynamically driven, A is digit select signal output, B is 7 segment output, Tr ₁ ~
Tr ₅ is an anode switching transistor,
Tr ₁₀ to _{Tr 70} are segment switching transistors, and 11 is a current limiting resistor.

そこで本考案は、商用電源駆動モードとバツテ
リ駆動モードに切替えられるよう構成すると共に
表示回路の電源回路に直列に介装された電流制限
抵抗器を前記切替えに連動してバツテリ駆動時に
は商用電源駆動モード時よりも高抵抗となるよう
切替える切替手段を設け、バツテリ駆動モード時
には表示の輝度を読み取りに支障をきたさない程
度にまで下げて表示回路の電力消費を低減したも
のであつて、以下本考案の実施例を第３図と第４
図に基づいて説明する。なお、第１図ならびに第
２図と同じ作用を成すものには同一符号を付けて
その説明を省く。 Therefore, the present invention is configured so that it can be switched between a commercial power supply drive mode and a battery drive mode, and a current limiting resistor inserted in series with the power supply circuit of the display circuit is linked to the switching so that the display circuit is switched between the commercial power supply drive mode and the battery drive mode. This device is equipped with a switching means that switches the resistance to a higher resistance than when the battery is in the battery drive mode, and lowers the display brightness to a level that does not interfere with reading when in the battery drive mode, thereby reducing the power consumption of the display circuit. Examples are shown in Figures 3 and 4.
This will be explained based on the diagram. Components having the same functions as those in FIGS. 1 and 2 are designated by the same reference numerals, and their explanations will be omitted.

第３図において、Sa〜Sgは前記選択スイツチ
１０と連動する切替スイツチで、選択スイツチ１
０がバツテリ５側に接続された時にブレイク状態
となり、商用電源側に接続された時にメイク状態
となる。１２ａ〜１２ｇはそれぞれ前記各切替ス
イツチSa〜Sgを介して電流制限用抵抗器１１の
抵抗器１１ａ〜１１ｇに並列接続される抵抗器で
ある。ここで前記抵抗器１１ａ〜１１ｇを標準輝
度が得られる抵抗値Ｒの２倍の抵抗値の2Rとし、
かつ抵抗器１１ａ〜１１ｇと１２ａ〜１２ｇを全
て同一抵抗値とする。 In FIG. 3, Sa to Sg are changeover switches that operate in conjunction with the selection switch 10.
0 is connected to the battery 5 side, it becomes a break state, and when connected to the commercial power supply side, it becomes a make state. 12a to 12g are resistors connected in parallel to the resistors 11a to 11g of the current limiting resistor 11 via the changeover switches Sa to Sg, respectively. Here, the resistors 11a to 11g are set to 2R, which has a resistance value twice the resistance value R that provides standard brightness,
In addition, all of the resistors 11a to 11g and 12a to 12g have the same resistance value.

このように構成したため、選択スイツチ１０を
商用電源側に接続して前記切換スイツチSa〜Sg
がメイク状態となると、抵抗器１１ａ〜１１ｇに
それぞれ抵抗器１２ａ〜１２ｇが並列接続され
て、各合成抵抗値がＲとなるため、発光ダイオー
ド表示器DP₁〜DP₅は標準輝度で発光する。選択
スイツチ１０をバツテリ５側に接続すると、切換
スイツチSa〜Sgがブレイク状態となつて各抵抗
器１１ａ〜１１ｇと１２ａ〜１２ｇとの並列接続
がオフされるため、電流制限用抵抗値が2Rとな
つて前記標準輝度よりも暗くなり発光ダイオード
表示器DP₁〜DP₂の消費電力が商用電源駆動モー
ド時の1/2に低減される。なお、前記選択スイツ
チ１０としては手動切換スイツチまたは電源コー
ドの着脱に連動するスイツチを挙げることができ
る。 With this configuration, the selection switch 10 is connected to the commercial power supply side and the selection switches Sa to Sg
When in the make state, the resistors 12a to 12g are connected in parallel to the resistors 11a to 11g, respectively, and the combined resistance value of each becomes R, so that the light emitting diode indicators _DP1 to _DP5 emit light at standard brightness. When the selection switch 10 is connected to the battery 5 side, the changeover switches Sa to Sg enter the break state and the parallel connection between the resistors 11a to 11g and 12a to 12g is turned off, so the current limiting resistance value becomes 2R. As a result, the luminance becomes darker than the standard brightness, and the power consumption of the light emitting diode displays DP ₁ to _{DP 2} is reduced to 1/2 of that in the commercial power supply drive mode. The selection switch 10 may be a manual changeover switch or a switch that is linked to the connection and disconnection of the power cord.

上記実施例では切換スイツチSa〜Sgは選択ス
イツチ１０に連動するものとして説明したが、こ
れは第４図に示すように商用電源側出力電圧の有
無を検出する手段として、例えばリレー１３を設
け、各切換スイツチSa〜Sgとしてリレー１３の
メイク接点を用いることができる。１４は安定化
電源回路である。 In the above embodiment, the changeover switches Sa to Sg have been explained as being linked to the selection switch 10, but as shown in FIG. Make contacts of the relay 13 can be used as each of the changeover switches Sa to Sg. 14 is a stabilized power supply circuit.

以上説明のように本考案によると、電源のモー
ドに連動してバツテリ駆動モードでは表示回路の
電流が低減されて表示器の輝度が低輝度状態とな
るため、バツテリ駆動状態でも長期間にわたつて
安定した動作が期待できるものである。 As explained above, according to the present invention, the current of the display circuit is reduced in the battery drive mode in conjunction with the power supply mode, and the brightness of the display becomes low brightness, so even in the battery drive mode, the brightness of the display remains low for a long period of time. Stable operation can be expected.

[Brief explanation of the drawing]

第１図は従来の電源モード切替式はかりの構成
図、第２図は第１図の要部構成図、第３図は本考
案の電源モード切替式はかりの一実施例の要部構
成図、第４図は他の実施例の説明図である。２……はかり本体、３……表示回路、５……バ
ツテリ、６……商用電源接続用プラグ、１０……
選択スイツチ、１１……電流制限用抵抗器、１２
ａ〜１２ｇ……抵抗器、Sa〜Sg……切替スイツ
チ、DP₁〜DP₅……発光ダイオード表示器。 FIG. 1 is a block diagram of a conventional power mode switching type scale, FIG. 2 is a block diagram of the main parts of FIG. 1, and FIG. 3 is a block diagram of main parts of an embodiment of the power mode switching scale of the present invention. FIG. 4 is an explanatory diagram of another embodiment. 2... Scale body, 3... Display circuit, 5... Battery, 6... Commercial power supply connection plug, 10...
Selection switch, 11... Current limiting resistor, 12
a to 12g...Resistor, Sa to Sg...Switch, DP ₁ to _{DP 5} ...Light emitting diode display.

Claims

[Scope of utility model registration request]

The power supply circuit is configured to be able to be switched between a commercial power drive mode and a battery drive mode, and a current limiting resistor inserted in series with the power supply circuit of the display circuit is connected to the switching so that the battery drive mode is switched to the commercial power drive mode. A power mode switching type scale equipped with a switching means to switch to a higher resistance than the current one.