JPH02114306A - Constant voltage power supply circuit - Google Patents

Abstract

PURPOSE:To reduce the power consumption of a constant voltage circuit or the like by using plural constant voltage circuits and voltage control circuits in a constant voltage power supply circuit to connect loads in series. CONSTITUTION:A constant voltage is extracted from a constant voltage source V through plural constant voltage circuits V1, V2 to connect plural loads in series and a difference in the current values of current flowing into respective loads is compensated by a voltage control circuit to reduce power loss in each constant voltage circuit. Namely, current flowing into the constant voltage circuit 41 passes the load 5a and then flows into the constant voltage circuit 42 through the load 5b. The difference of currents flowing into the loads 5a, 5b is supplied from the voltage control circuit 6 or absorbed by the circuit 6. Thus, the loads 5a, 5b are connected in series. Consequently, current flowing into the constant voltage power supply circuit can be reduced.

Description

【発明の詳細な説明】[Detailed description of the invention] 【産業上の利用分野】[Industrial application field]

この発明は、テレビジョン受信機、ビデオテープレコー
ダ、無線機等の低消費電力の電気回路に適した定電圧電
源回路に関するものである。The present invention relates to a constant voltage power supply circuit suitable for low power consumption electric circuits such as television receivers, video tape recorders, and radio equipment.

【従来の技術】[Conventional technology]

第５図は従来の定電圧電源回路を示すブロック図であり
、図において１は定電圧源Ｖで、出力電圧はＶｉとする
。２は定電圧源１から引き出した正電圧電源線、３は定
電圧源１から引き出した負電圧電源線、４は定電圧回路
で、出力電圧は■。 とする。５ａは負荷、７ａ、７ｂは電圧供給端子である
。 次に動作について説明する。定電圧源１から供給された
電圧ｖｉは、定電圧回路４で出力電圧■。 に変換され電圧供給端子７ａ、７ｂ間に供給される。こ
の電圧供給端子７ａ、７ｂ間に負荷を接続して、定電圧
電源回路は使用されている。 定電圧回路４は抵抗、トランジスタ、ダイオード等で構
成されているので、電力を消費し、定電圧電源回路全体
の消費電力は負荷５ａへの供給電力に定電圧回路４の損
失電力を加えた量となる。 定電圧回路４の損失電力は、定電圧源１の出力電圧をｖ
！、定電圧回路４の出力電圧を■。および負荷５ａを流
れる電流を■として、 （Ｖ、−Ｖｏ）Ｘ　Ｉ　　　　　　　　　−−−一−・
・■であられされる。 例えば、Ｖｉ　＝１２（Ｖ）　、Ｖ０＝５（Ｖ）　、負
荷＝１００（Ω）とすると、Ｉ　＝　５０　（ｍＡ）　
　となり、０式にこれらの値をあてはめて、損失電力は
（１２−５）　（Ｖ）Ｘ５０（ｍ）＝３５０（ｍＷ）と
なる。 また、負荷５ａ、５ｂを２個接続する場合は、第５図に
破線で示すように、電圧供給端子７ａ。 ７ｂ間に並列に接続するが、例えば１００　（Ω）の負
荷を２個並列に接続した場合は、損失電力は７００ｍＷ
となり、一方、２個の負荷の消費電力の合計は５００ｍ
Ｗとなる。FIG. 5 is a block diagram showing a conventional constant voltage power supply circuit. In the figure, 1 is a constant voltage source V and the output voltage is Vi. 2 is a positive voltage power line drawn out from constant voltage source 1, 3 is a negative voltage power line drawn out from constant voltage source 1, 4 is a constant voltage circuit, and the output voltage is ■. shall be. 5a is a load, and 7a and 7b are voltage supply terminals. Next, the operation will be explained. The voltage vi supplied from the constant voltage source 1 is output voltage ■ by the constant voltage circuit 4. and is supplied between voltage supply terminals 7a and 7b. A constant voltage power supply circuit is used by connecting a load between the voltage supply terminals 7a and 7b. Since the constant voltage circuit 4 is composed of resistors, transistors, diodes, etc., it consumes power, and the power consumption of the entire constant voltage power supply circuit is the sum of the power supplied to the load 5a and the power loss of the constant voltage circuit 4. becomes. The power loss of the constant voltage circuit 4 is calculated by changing the output voltage of the constant voltage source 1 to v
! , the output voltage of the constant voltage circuit 4 is ■. and the current flowing through the load 5a as ■, (V, -Vo)X I---1-・
・It is hailed by ■. For example, if Vi = 12 (V), V0 = 5 (V), and load = 100 (Ω), then I = 50 (mA)
By applying these values to the equation 0, the power loss is (12-5) (V) x 50 (m) = 350 (mW). Moreover, when connecting two loads 5a and 5b, as shown by the broken line in FIG. 5, the voltage supply terminal 7a. For example, if two 100 (Ω) loads are connected in parallel between 7b and 7b, the power loss will be 700mW.
On the other hand, the total power consumption of the two loads is 500m
It becomes W.

【発明が解決しようとする課題】[Problem to be solved by the invention]

従来の定電圧電源回路は以上のように構成されているの
で、０式であられされた定電圧回路４の損失電力は、特
に、定電圧回路４の出力電圧ｖ０を小さくしたり、負荷
抵抗が小さくなって電流Ｉが大きくなったりすると、増
大して電力効率が悪くなるという課題があった。 この発明は上記のような課題を解消するためになされた
もので、定電圧回路の損失電力を減少させて、電力効率
を向上させることができる定電圧電源回路を得ることを
目的とする。Since the conventional constant-voltage power supply circuit is configured as described above, the power loss of the constant-voltage circuit 4 calculated by the formula 0 can be reduced by reducing the output voltage v0 of the constant-voltage circuit 4 or by increasing the load resistance. When the current I becomes smaller and the current I becomes larger, there is a problem in that it increases and the power efficiency deteriorates. The present invention was made to solve the above-mentioned problems, and an object of the present invention is to obtain a constant voltage power supply circuit that can reduce power loss in the constant voltage circuit and improve power efficiency.

【課題を解決するための手段】[Means to solve the problem]

二の発明に係る定電圧電源回路は、定電圧源■に、互い
に並列になるように複数の定電圧回路および電圧制御回
路を接続し、これらの定電圧回路および電圧制御回路の
出力電圧を互いに異なるように設定し、これらの定電圧
回路および電圧制御回路の出力端子を電圧供給端子とし
たものである。In the constant voltage power supply circuit according to the second invention, a plurality of constant voltage circuits and voltage control circuits are connected to the constant voltage source (1) in parallel with each other, and the output voltages of these constant voltage circuits and voltage control circuits are mutually connected. They are set differently, and the output terminals of these constant voltage circuits and voltage control circuits are used as voltage supply terminals.

【作用】[Effect]

この発明における定電圧電源回路は、定電圧源Ｖから複
数の定電圧回路Ｖ、、Ｖ、、・・・・・・で定電圧を取
り出し、複数の負荷を直列接続可能とし、各負荷を流れ
る電流の差を電圧制御回路で補償することにより、各定
電圧回路における損失電力を減少させる。The constant voltage power supply circuit according to the present invention extracts a constant voltage from a constant voltage source V through a plurality of constant voltage circuits V, , V, . By compensating for the difference in current with the voltage control circuit, power loss in each constant voltage circuit is reduced.

【実施例】【Example】

以下、この発明の一実施例を図について説明する。第１
図において、■は定電圧源、２は定電圧源１から引き出
した正電圧電源線、３は定電圧源１から引き出した負電
圧電源線、４１および４２は出力が一定電圧となる定電
圧回路、５ａおよび５ｂは負荷、６は負荷５ａ、５ｂを
流れる電流の差を補償する電圧制御回路、７ａ、７ｂお
よび７Ｃは電圧供給端子である。 ２つの定電圧回路４１．４２および電圧制御回路６の出
力電圧は、定電圧回路４１の出力−電圧制御回路６の出
力一定電圧回路４２の出力の順に小さくなるように設定
されているとする。定電圧源１の出力電圧ｖ８は、２つ
の定電圧回路４１゜４２および電圧制御回路６で変換さ
れた出力電圧として取り出され、定電圧回路４１の出力
端子と電圧制御回路６の出力端子とが、それぞれ電圧供
給端子７ａ、７ｂとなり、電圧制御回路６の出力端子と
定電圧回路４２の出力端子とが、それぞれ電圧供給端子
７ｂ、７ｃとなる。この電圧供給端子７ａ、７ｂ問およ
び他の電圧供給端子７ｂ、７０間に負荷を接続して定電
圧電源回路は使用される。 次に動作について説明する。定電圧回路４１に流れ込ん
だ電流は、負荷５ａを通った後、負荷５ｂを通り、定電
圧回路４２へ流れ込む。ここで、負荷５ａおよび５ｂを
流れる電流の差は電圧制御回路６から供給され、あるい
は電圧制御回路６に吸収される。以上のように、負荷５
ａ、５ｂを直列接続可能とすることにより、定電圧電源
回路を流れる電流を減らすことができる。 ここで、定電圧源１の出力が１２Ｖ、２つの定電圧回路
４１．４２の出力電圧がそれぞれＩＩＶおよび１■、電
圧制御回路６の出力電圧が６■に設定されているとする
。すると、電圧供給端子７ａ、７ｂ間の電圧Ｖ　ｏ　Ｉ
は５Ｖ、他の電圧供給端子７ｂ、７Ｃ間の電圧■。２は
５■となる。負荷５ａ。 ５ｂの抵抗値をそれぞれ１００Ωとした時に、負荷５ａ
を流れる電流は５０ｍＡであり、この電流はそのまま負
荷５ｂに流れる。この時、損失電力は定電圧回路４１に
おいて、 （１２１１）（Ｖ）Ｘ５０（ｍＡ）＝５０（ｍＷ）定電
圧回路４２において、 （０−１）　　（Ｖ）　　Ｘ　　５　０　　（ｍＡ）−
５０（ｍＷ）この場合は電圧制御回路６には電流は流れ
ないので、損失はなく、結局、損失電力は５０＋５０＝
１００　（ｍＷ）となる。一方、負荷５ａ、５ｂの消費
電力は５（Ｖ）　Ｘ５０（ｍＡ）ＸＺ＝５００（ｍＷ）
となり、従来の場合に比べて、電力効率は大幅に改善さ
れている。負荷５ａ、５ｂが同じ抵抗値である場合が最
も電力効率がよいが、異なる値であっても、従来の場合
に比べて電力効率は向上する。 なお、上記実施例では定電圧回路４１．４２の出力端子
と電圧制御回路６の出力端子とを電圧供給端子７ａ、７
ｂ、７ｃとしたものを示したが、第２図に示すように、
さらに定電圧源１の負電圧電源線３を電圧供給端子７ｄ
としてもよい。この場合には、定電圧回路４２に負荷５
ｂ、５ｃに流れる電流の差を補償する機能を持たせてい
る。 また、第３図に示すように、定電圧源１の正電圧電源線
２および負電圧電源線３をそのまま電圧供給端子７ａ、
７ｃとして、電圧制御回路６の出力端子を電圧供給端子
７ｂとしてもよい。 さらに、第４図に示すように、定電圧回路４１を１つに
して、この定電圧回路４１の出力端子、電圧制御回路６
の出力端子および定電圧源１の負電圧電源線３を電圧供
給端子７ａ、７ｂ、７ｃとし、でもよく、上記実施例と
同様の効果を奏する。An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, ■ is a constant voltage source, 2 is a positive voltage power line drawn out from constant voltage source 1, 3 is a negative voltage power line drawn out from constant voltage source 1, and 41 and 42 are constant voltage circuits whose output is a constant voltage. , 5a and 5b are loads, 6 is a voltage control circuit that compensates for the difference in current flowing through the loads 5a and 5b, and 7a, 7b and 7C are voltage supply terminals. It is assumed that the output voltages of the two constant voltage circuits 41 and 42 and the voltage control circuit 6 are set to decrease in the order of the output of the constant voltage circuit 41 - the output of the voltage control circuit 6, and the output of the constant voltage circuit 42. The output voltage v8 of the constant voltage source 1 is taken out as an output voltage converted by the two constant voltage circuits 41 and 42 and the voltage control circuit 6, and the output terminal of the constant voltage circuit 41 and the output terminal of the voltage control circuit 6 are connected. , respectively become voltage supply terminals 7a and 7b, and the output terminal of the voltage control circuit 6 and the output terminal of the constant voltage circuit 42 become voltage supply terminals 7b and 7c, respectively. A constant voltage power supply circuit is used by connecting a load between these voltage supply terminals 7a and 7b and the other voltage supply terminals 7b and 70. Next, the operation will be explained. The current flowing into the constant voltage circuit 41 passes through the load 5a, then through the load 5b, and then flows into the constant voltage circuit 42. Here, the difference between the currents flowing through the loads 5a and 5b is supplied from the voltage control circuit 6 or absorbed by the voltage control circuit 6. As mentioned above, load 5
By making it possible to connect a and 5b in series, it is possible to reduce the current flowing through the constant voltage power supply circuit. Here, it is assumed that the output of the constant voltage source 1 is set to 12V, the output voltages of the two constant voltage circuits 41 and 42 are set to IIV and 1■, respectively, and the output voltage of the voltage control circuit 6 is set to 6■. Then, the voltage V o I between the voltage supply terminals 7a and 7b
is 5V, and the voltage ■ between the other voltage supply terminals 7b and 7C. 2 becomes 5 ■. Load 5a. When the resistance value of 5b is 100Ω, the load 5a
The current flowing through is 50 mA, and this current flows directly to the load 5b. At this time, the power loss in the constant voltage circuit 41 is (1211) (V) x 50 (mA) = 50 (mW), and in the constant voltage circuit 42, (0-1) (V) x 50 (mA) -
50 (mW) In this case, no current flows through the voltage control circuit 6, so there is no loss, and the power loss is 50+50=
100 (mW). On the other hand, the power consumption of loads 5a and 5b is 5 (V) X50 (mA) XZ = 500 (mW)
Therefore, power efficiency is significantly improved compared to the conventional case. Although the power efficiency is best when the loads 5a and 5b have the same resistance value, the power efficiency is improved compared to the conventional case even when the loads 5a and 5b have different resistance values. In the above embodiment, the output terminals of the constant voltage circuits 41 and 42 and the output terminals of the voltage control circuit 6 are connected to the voltage supply terminals 7a and 7.
b, 7c, but as shown in Figure 2,
Furthermore, the negative voltage power supply line 3 of the constant voltage source 1 is connected to the voltage supply terminal 7d.
You can also use it as In this case, the load 5 is applied to the constant voltage circuit 42.
It has a function of compensating for the difference in currents flowing through b and 5c. Further, as shown in FIG. 3, the positive voltage power line 2 and the negative voltage power line 3 of the constant voltage source 1 are directly connected to the voltage supply terminal 7a,
As 7c, the output terminal of the voltage control circuit 6 may be used as the voltage supply terminal 7b. Furthermore, as shown in FIG. 4, the constant voltage circuit 41 is integrated into one, and the output terminal of this constant voltage circuit 41 and the voltage control circuit 6
The output terminal and the negative voltage power supply line 3 of the constant voltage source 1 may be used as the voltage supply terminals 7a, 7b, and 7c, and the same effect as in the above embodiment can be obtained.

【発明の効果】【Effect of the invention】

以上のように、この発明によれば定電圧電源回路を複数
の定電圧回路および電圧制御回路を用いて、負荷を直列
接続できるように構成したので、流れる電流を少なくす
ることにより定電圧回路等の消費電力を低下させること
ができ、その結果、電力効率のよいものが得られる効果
がある。As described above, according to the present invention, the constant voltage power supply circuit is configured using a plurality of constant voltage circuits and voltage control circuits so that loads can be connected in series. The power consumption of the device can be reduced, and as a result, a device with good power efficiency can be obtained.

【図面の簡単な説明】[Brief explanation of drawings]

第１図はこの発明の一実施例による定電圧電源回路を示
すブロック図、第２図〜第４図は他の実施例による定電
圧電源回路を示すブロック図、第５図は従来の定電圧電
源回路を示すブロック図である。 １は定電圧源、４１．４２は定電圧回路、５ａ５ｂは負
荷、６は電圧制御回路。 なお、図中、同一符号は同一、又は相当部分を示す。 第１図 ＠３図 第２図 第４図FIG. 1 is a block diagram showing a constant voltage power supply circuit according to one embodiment of the present invention, FIGS. 2 to 4 are block diagrams showing constant voltage power supply circuits according to other embodiments, and FIG. 5 is a block diagram showing a constant voltage power supply circuit according to another embodiment of the present invention. FIG. 2 is a block diagram showing a power supply circuit. 1 is a constant voltage source, 41.42 is a constant voltage circuit, 5a5b is a load, and 6 is a voltage control circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Figure 1 @ Figure 3 Figure 2 Figure 4

Claims (1)

【特許請求の範囲】[Claims] 定電圧源と、互いに並列に前記定電圧源に接続され、そ
れぞれの出力電圧が互いに異なる値に設定された複数の
定電圧回路および電圧制御回路と、前記複数の定電圧回
路および前記電圧制御回路の出力を引き出した電圧供給
端子とを備えた定電圧電源回路。a constant voltage source; a plurality of constant voltage circuits and voltage control circuits connected in parallel to the constant voltage source and each having an output voltage set to a different value; and the plurality of constant voltage circuits and the voltage control circuit. A constant voltage power supply circuit equipped with a voltage supply terminal that draws the output of.