JPH0542484Y2 - - Google Patents
Info
- Publication number
- JPH0542484Y2 JPH0542484Y2 JP1982149916U JP14991682U JPH0542484Y2 JP H0542484 Y2 JPH0542484 Y2 JP H0542484Y2 JP 1982149916 U JP1982149916 U JP 1982149916U JP 14991682 U JP14991682 U JP 14991682U JP H0542484 Y2 JPH0542484 Y2 JP H0542484Y2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- transistor
- output
- power supply
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000003990 capacitor Substances 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Landscapes
- Continuous-Control Power Sources That Use Transistors (AREA)
Description
本考案は直流電源、特に電池等の低電圧直流電
源用の定電圧回路に関するものである。
従来使用されていた低電圧直流電源における定
電圧回路の例には第１図記載の回路があげられる
が、これは、電源（電池）１と負荷８との間に３
端子レギユレータ４を直列に接続してなるもの
で、安定した出力電圧を得るために入力電圧と出
力電圧の電位差は2V以上でなければ安定化でき
ないものであつた。たとえば入力電圧の上限が約
7V、最終使用電圧を5Vとすれば、安定化回路の
出力電圧が5Vの場合、その電位差は０〜2Vとな
り、電位差が2V以下の定電圧電源として使用す
る場合、前記の如き通常の定電圧回路では定電圧
作動が困難であり、このような低電圧で安定化で
きるようなデバイスはなかつたので定電圧電源と
しては出力電圧の安定化を計れないものであつ
た。そこで、本考案の目的は入力電圧と出力電圧
の電位差が2V以下のときでも安定化電源として
使用できるようにしたものである。
本考案は上記の問題の解決を主な目的とするも
のであつて、その特徴は、直流電源と負荷との間
で出力を安定化する制御としてトランジスタTr1
と前記トランジスタTr1の温度変化による電圧の
安定化を計るためにダイオードD1を設け、前記
公知定電圧回路内にDC−DCコンバータを組込ん
でサブの電源を形成し、電源と出力間に接続され
たトランジスタを制御して、低電圧差でも安定に
定電圧出力を得ることにある。
本考案に係る定電圧回路の１例を第２図に示
す。該図おいて１は直流電源たとえば電池6.2V
であつて、これと負荷８との間にDC−DCコンバ
ータ３および5V−３端子レギユレータ４が並列
に配置されている。電源１からの電圧6.2Vの電
流はDC−DCコンバータ３において9Vに昇圧さ
れサブの電源となる。この9Vのサブの電源より
5.6Vの定電圧回路を構成すれば従来の定電圧回
路でも充分な定電圧マージンがとれる。即ち、サ
ブ電源を用いて制御用の安定化電圧を得る回路
は、従来の安定化回路においては入出力電位差が
2V以上必要であつたが、5.6Vの出力を得るため
の電圧は9Vあり、入出力には3.4Vの電位差があ
り、1.4Vのマージンとなる。DC−DCコンバータ
３からの電圧9Vの電圧は5V−３端子レギユレー
タ４に入り、ここで5.6Vの定電圧に制御され、
この定電圧出力はトランジスタTr1５のベースに
印加される。しかしてこの場合には、負荷８にか
かる電圧はトランジスタTr1のコレクターエミツ
タ間の電位差およびベース電流関係の特性で決
る。
ここで有利に使用できるトランジスタの例には
2SD553があげられる。このトランジスタTr1５で
はベース−エミツタ間の電位差が0.6Vが必要で
あるから、5V−３端子レギユレータ４の出力を
0.6V高くする必要があり、レギユレータ出力は
前記の如く5.6Vになる。このために5V−３端子
レギユレータ４のコモンにたとえばシリコンダイ
オードD1９を入れてこの分を補う。しかしなが
らトランジスタのベース−エミツタ間の電位は温
度が下がると電位が上り、温度が上ると電位が下
がるという特性（温度係数）を持つている。トラ
ンジスタの等価回路はダイオード２本の等価回路
に置き換えられることにより、ベースエミツタ間
はダイオードと考える。このため、トランジスタ
の制御電圧もトランジスタのベースエミツタ間の
特性と同じ特性をもつダイオードD1により、温
度による電位を変化させ、負荷８にかかる電圧を
一定とするものである。６，７，１０はすべてデ
カツプリングコンデンサである。
第２図記載の直流電源用定電圧回路を用いた実
験の結果は次の通りである。最初に、入力電圧を
一定にした場合の負荷条件（負荷電流）の変化に
よる出力電圧の変化について調べたが、その結果
を第１表および第３図、第４図のグラフに示す。
The present invention relates to a constant voltage circuit for a DC power source, particularly a low voltage DC power source such as a battery. An example of a constant voltage circuit in a conventionally used low voltage DC power supply is the circuit shown in FIG.
It consists of terminal regulators 4 connected in series, and in order to obtain a stable output voltage, the potential difference between the input voltage and the output voltage must be 2V or more in order to be stabilized. For example, if the upper limit of input voltage is approx.
7V, and the final use voltage is 5V, if the output voltage of the stabilizing circuit is 5V, the potential difference will be 0 to 2V, and when used as a constant voltage power supply with a potential difference of 2V or less, the normal constant voltage as described above. Constant voltage operation was difficult for circuits, and there was no device that could stabilize the output voltage at such a low voltage, so it was impossible to stabilize the output voltage as a constant voltage power supply. Therefore, the purpose of the present invention is to enable use as a stabilized power supply even when the potential difference between the input voltage and the output voltage is 2V or less. The main purpose of this invention is to solve the above problem, and its feature is that the transistor T r1 is used as a control to stabilize the output between the DC power supply and the load.
A diode D1 is provided in order to stabilize the voltage due to temperature changes of the transistor Tr1 , and a DC-DC converter is incorporated in the known constant voltage circuit to form a sub power supply, and a sub power supply is formed between the power supply and the output. The purpose is to control the connected transistors to obtain a stable constant voltage output even with low voltage differences. An example of a constant voltage circuit according to the present invention is shown in FIG. In the figure, 1 is a DC power source, such as a 6.2V battery.
A DC-DC converter 3 and a 5V-3 terminal regulator 4 are arranged in parallel between this and the load 8. A current with a voltage of 6.2V from the power supply 1 is boosted to 9V in the DC-DC converter 3 and becomes a sub power supply. From this 9V sub power supply
If a 5.6V constant voltage circuit is configured, a sufficient constant voltage margin can be obtained even with a conventional constant voltage circuit. In other words, in a conventional stabilizing circuit, a circuit that uses a sub power supply to obtain a stabilized voltage for control has a voltage difference between input and output.
Although 2V or more was required, the voltage to obtain a 5.6V output is 9V, and there is a 3.4V potential difference between input and output, resulting in a 1.4V margin. The 9V voltage from the DC-DC converter 3 enters the 5V-3 terminal regulator 4, where it is controlled to a constant voltage of 5.6V.
This constant voltage output is applied to the base of transistor T r1 5. However, in this case, the voltage applied to the load 8 is determined by the potential difference between the collector and emitter of the transistor T r1 and the characteristics of the base current relationship. Examples of transistors that can be used to advantage here include
2SD553 is given. This transistor T r1 5 requires a base-emitter potential difference of 0.6V, so the output of the 5V-3 terminal regulator 4 is
It is necessary to increase the voltage by 0.6V, and the regulator output becomes 5.6V as described above. For this purpose, a silicon diode D 1 9, for example, is inserted into the common of the 5V-3 terminal regulator 4 to compensate for this. However, the potential between the base and emitter of a transistor has a characteristic (temperature coefficient) that the potential increases as the temperature decreases, and decreases as the temperature increases. By replacing the equivalent circuit of a transistor with an equivalent circuit of two diodes, the base-emitter circuit is considered to be a diode. For this reason, the voltage applied to the load 8 is kept constant by changing the potential depending on the temperature using the diode D1 , which has the same characteristics as the transistor's control voltage between the base and emitter of the transistor. 6, 7, and 10 are all decoupling capacitors. The results of an experiment using the DC power supply constant voltage circuit shown in FIG. 2 are as follows. First, we investigated changes in output voltage due to changes in load conditions (load current) when the input voltage was kept constant, and the results are shown in Table 1 and the graphs in FIGS. 3 and 4.
【表】【table】
【表】
次に、出力電流を一定とした場合の入力電圧に
対する出力電圧の変動および入力電流I1の変化に
ついての実験データを、第２表および第４図（グ
ラフ）に示す。[Table] Next, Table 2 and FIG. 4 (graph) show experimental data regarding fluctuations in output voltage and changes in input current I 1 with respect to input voltage when the output current is constant.
【表】
温度による出力電圧の変化に関する実験データ
を第３表に示す。[Table] Table 3 shows experimental data regarding changes in output voltage due to temperature.
【表】
前記の実験データから明らかなように、本考案
に係る直流電源用定電圧回路は、比較的簡単な回
路であるにもかかわらずすぐれた定電圧効果を奏
するものである。この定電圧回路は前記の如く電
池電源電圧（たとえば6.2V）と最終使用電圧
（たとえば5.0V）との電位差がかなり小さい場合
に特にすぐれた安定化効果を発揮し、電池の使用
効率が非常に良くなる。
本回路は特に、定電圧の電池電源を用いしかも
測定誤差の低下のために定電圧作動が特に厳しく
要求される種々の測定機器たとえば測量機器のた
めの定電圧回路として非常に有利に使用できるも
のであるが、それ以外の分野でも勿論使用でき
る。測定機器においては使用電源が電池のとき
は、電池を１本以上増やさなければならなくな
り、それを本体側に組込むことはスペースに問題
があり本考案によつてこの欠点を妨げるものであ
る。
本明細書には本考案の若干の具体例について詳
細に記載されているが、当業者には明らかなよう
な本考案は種々の態様で実施できるものである。[Table] As is clear from the above experimental data, the constant voltage circuit for DC power supply according to the present invention exhibits an excellent constant voltage effect despite being a relatively simple circuit. As mentioned above, this constant voltage circuit exhibits a particularly excellent stabilizing effect when the potential difference between the battery power supply voltage (for example, 6.2V) and the final use voltage (for example, 5.0V) is quite small, and the battery usage efficiency is extremely high. Get better. This circuit can be particularly advantageously used as a constant-voltage circuit for various measuring instruments, such as surveying instruments, which use a constant-voltage battery power source and require particularly strict constant-voltage operation to reduce measurement errors. However, it can of course be used in other fields as well. When a battery is used as a power source in a measuring instrument, it is necessary to add one or more batteries, and incorporating it into the main body causes a space problem, and the present invention prevents this drawback. Although several embodiments of the invention are described in detail herein, the invention can be practiced in various ways as will be apparent to those skilled in the art.
第１図は従来の定電圧回路の１例の略式回路図
である。第２図は本考案に係る定電圧回路の１例
の略式回路図である。第３図は、本考案に係る回
路において入力電圧が一定である場合の負荷条件
の変化による出力電圧の変化を示すグラフであ
り、第４図は、出力電流を一定とした場合の入力
電圧に対する出力電圧の変化を示すグラフであ
る。
１……電源（電池）、３……DC−DCコンバー
タ、４……３端子レギユレータ、５……トランジ
スタ（たとえば2SD553）、６……コンデンサ、７
……コンデンサ、８……負荷、９……ダイオー
ド、１０……コンデンサ。
FIG. 1 is a schematic circuit diagram of an example of a conventional constant voltage circuit. FIG. 2 is a schematic circuit diagram of an example of a constant voltage circuit according to the present invention. Figure 3 is a graph showing changes in output voltage due to changes in load conditions when the input voltage is constant in the circuit according to the present invention, and Figure 4 is a graph showing changes in output voltage with respect to input voltage when the output current is constant. 7 is a graph showing changes in output voltage. 1... Power supply (battery), 3... DC-DC converter, 4... 3-terminal regulator, 5... Transistor (for example, 2SD553), 6... Capacitor, 7
...Capacitor, 8...Load, 9...Diode, 10...Capacitor.
Claims (1)
るためにDC−DCコンバータと３端子レギユレー
タとトランジスタとダイオードを設け、３端子レ
ギユレータの出力端子をトランジスタのベース
に、直流電源をトランジスタのコレクタに、負荷
をトランジスタのエミツタに接続し、トランジス
タの温度変化を制御するために３端子レギユレー
タのコモンに前記ダイオードを接続して入力電圧
と出力電圧の電位差が2V以下となつても前記ト
ランジスタの出力電圧を安定化した直流電源用定
電圧回路。 In order to stabilize the output voltage between the DC power supply and the load, a DC-DC converter, a 3-terminal regulator, a transistor, and a diode are provided, and the output terminal of the 3-terminal regulator is connected to the base of the transistor, and the DC power supply is connected to the collector of the transistor. , a load is connected to the emitter of the transistor, and the diode is connected to the common of a three-terminal regulator to control the temperature change of the transistor, so that even if the potential difference between the input voltage and the output voltage is 2V or less, the output voltage of the transistor is A constant voltage circuit for DC power supplies that stabilizes the voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14991682U JPS5958816U (en) | 1982-10-02 | 1982-10-02 | Constant voltage circuit for DC power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14991682U JPS5958816U (en) | 1982-10-02 | 1982-10-02 | Constant voltage circuit for DC power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5958816U JPS5958816U (en) | 1984-04-17 |
| JPH0542484Y2 true JPH0542484Y2 (en) | 1993-10-26 |
Family
ID=30332648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14991682U Granted JPS5958816U (en) | 1982-10-02 | 1982-10-02 | Constant voltage circuit for DC power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5958816U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5431546A (en) * | 1977-08-15 | 1979-03-08 | Hitachi Ltd | Direct current constant voltage electric source device |
-
1982
- 1982-10-02 JP JP14991682U patent/JPS5958816U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5431546A (en) * | 1977-08-15 | 1979-03-08 | Hitachi Ltd | Direct current constant voltage electric source device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5958816U (en) | 1984-04-17 |
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