JPS6213127Y2

JPS6213127Y2 -

Info

Publication number: JPS6213127Y2
Application number: JP13940779U
Authority: JP
Priority date: 1979-10-08
Filing date: 1979-10-08
Publication date: 1987-04-04
Also published as: JPS5655913U

Description

【考案の詳細な説明】この考案は、２個の回路装置に選択的に直流電
力を供給するための電源切換え回路に関するもの
である。[Detailed Description of the Invention] This invention relates to a power supply switching circuit for selectively supplying DC power to two circuit devices.

従来、２個の回路装置に選択的に直流電力を供
給するための回路には、２接点スイツチが用いら
れていた。しかし、２接点スイツチを用いる方法
は、機械的耐久性が小さいため接触不良を起しや
すい、スイツチが大型である、などの欠点を持つ
ていた。 Conventionally, a two-contact switch has been used in a circuit for selectively supplying DC power to two circuit devices. However, the method using a two-contact switch has drawbacks such as low mechanical durability, which tends to cause poor contact, and the switch is large.

この考案の目的は、電源と２個の回路装置との
間にスイツチング素子と１接点スイツチを介在さ
せることにより、小型で耐久性があり信頼性の高
い電源切換え回路を提供することである。 The purpose of this invention is to provide a compact, durable, and highly reliable power supply switching circuit by interposing a switching element and a one-contact switch between a power supply and two circuit devices.

以下この考案の一実施例を示した図に従つてこ
の考案を説明する。 This invention will be explained below with reference to figures showing one embodiment of this invention.

Ｑは、スイツチング素子としてのトランジスタ
でそのエミツタは直流電力を供給する電源１に、
コレクタは回路装置３に接続されている。Ｓは、
スイツチでその可動端子Saが電源１に、固定端
子Sbが回路装置２に接続されると共に抵抗Ｒ１
を介してトランジスタＱのベースに接続され、又
抵抗Ｒ２を介して接地している。 Q is a transistor as a switching element, and its emitter is connected to the power supply 1 that supplies DC power.
The collector is connected to the circuit arrangement 3. S is
The switch connects its movable terminal Sa to power supply 1, fixed terminal Sb to circuit device 2, and resistor R1.
It is connected to the base of the transistor Q via the resistor R2, and is grounded via the resistor R2.

この実施例の動作について説明する。 The operation of this embodiment will be explained.

スイツチＳが閉接されると、電源１からスイツ
チＳを介して回路装置２に電力が供給されると共
に、抵抗Ｒ１を介してトランジスタＱのベース電
圧がエミツタ電圧と等しくなりトランジスタＱは
遮断状態となり電源１から回路装置３へは電力は
供給されない。 When the switch S is closed, power is supplied from the power supply 1 to the circuit device 2 via the switch S, and the base voltage of the transistor Q becomes equal to the emitter voltage via the resistor R1, so that the transistor Q is cut off. No power is supplied from the power source 1 to the circuit device 3.

スイツチＳが開放されると、電源１からスイツ
チＳを介しての回路装置２への電力供給は停止さ
れると共に、トランジスタＱのベースは、抵抗Ｒ
１の抵抗Ｒ２とを介して接地されるため、ベース
電位がエミツタ電位より低くなりトランジスタＱ
は導通状態となり、電源１からトランジスタＱを
介して回路装置３に電力が供給される。抵抗Ｒ
１，Ｒ２共に高抵抗として電力損失を最小とし、
かつＲ１≫Ｒ２とすることでスイツチＳが開放時
の回路装置２への抵抗Ｒ１を介しての電力供給を
ほとんどなくすことができる。従つて１接点スイ
ツチの開放、閉接の切り換えによつて回路装置
２、回路装置３へ選択的に電源から電力を供給で
きる。 When the switch S is opened, the power supply from the power source 1 to the circuit device 2 via the switch S is stopped, and the base of the transistor Q is connected to the resistor R.
Since the transistor Q is grounded through the resistor R2, the base potential becomes lower than the emitter potential.
becomes conductive, and power is supplied from the power supply 1 to the circuit device 3 via the transistor Q. Resistance R
1 and R2 are both high resistance to minimize power loss,
Moreover, by setting R1>>R2, it is possible to almost eliminate the power supply to the circuit device 2 via the resistor R1 when the switch S is open. Therefore, electric power can be selectively supplied from the power supply to the circuit devices 2 and 3 by switching the one-contact switch between open and close.

第１図の実施例では、スイツチング素子として
バイポーラトランジスタを使用したが、ユニポー
ラトランジスタ等を使用してもよい。 In the embodiment shown in FIG. 1, a bipolar transistor is used as the switching element, but a unipolar transistor or the like may also be used.

この考案により、一接点スイツチの開閉により
２個の回路装置に選択的に電力を供給することが
可能であり、この考案の効果的な応用例として
は、実用新案登録請求の範囲の第１の回路装置を
カーステレオのカセツトデツキ部とし、第２の回
路装置をチユーナー部とした構成があげられる。 With this device, it is possible to selectively supply power to two circuit devices by opening and closing a one-contact switch.An example of an effective application of this device is the first claim of the utility model registration. For example, the circuit device may be a cassette deck section of a car stereo, and the second circuit device may be a tuner section.

[Brief explanation of the drawing]

図はこの考案の一例の回路図である。１は直流電源、２は回路装置、３は回路装置、
Ｑはスイツチング素子、Ｓは１接点スイツチ、Ｒ
１，Ｒ２は抵抗である。 The figure is a circuit diagram of an example of this invention. 1 is a DC power supply, 2 is a circuit device, 3 is a circuit device,
Q is a switching element, S is a 1-contact switch, R
1, R2 is a resistance.

Claims

[Scope of utility model registration request]

a power source for supplying DC power, a first circuit device, a second circuit device, a switch interposed between the power source and the first circuit device, and the power source and the second circuit device. a switching element interposed between the switch and the first circuit device; a first resistor interposed between the connection point between the switch and the first circuit device and a control terminal of the switching element;
a second resistor interposed between a connection point with the circuit device and a reference voltage point, and when the switch is closed, power is supplied from the power source to the first circuit device through the switch. At the same time, by controlling the voltage of the control terminal of the switching element, the switching element is cut off to stop the power supply from the power supply to the second circuit, and when the switch is opened, the power supply from the power supply to the second circuit is stopped. The switching device is characterized in that the power supply to the first circuit device is stopped and the voltage at the control terminal of the switching device is controlled to bring the switching device into a saturated state and power is supplied to the second circuit device. Power switching circuit.