KR0119736Y1 - Source voltage selecting circuit - Google Patents
Source voltage selecting circuitInfo
- Publication number
- KR0119736Y1 KR0119736Y1 KR2019940026849U KR19940026849U KR0119736Y1 KR 0119736 Y1 KR0119736 Y1 KR 0119736Y1 KR 2019940026849 U KR2019940026849 U KR 2019940026849U KR 19940026849 U KR19940026849 U KR 19940026849U KR 0119736 Y1 KR0119736 Y1 KR 0119736Y1
- Authority
- KR
- South Korea
- Prior art keywords
- power supply
- supply voltage
- voltage
- inverter
- 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
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Measurement Of Current Or Voltage (AREA)
- Control Of Voltage And Current In General (AREA)
Abstract
본 고안은 전원전압 선택회로에 관한 것으로, 두가지 전원에서 동작가능한 소자에 있어서, 종래에는 소자내부에 인가된 전원전압의 크기가 어떻게 되는지를 감지할 수 있는 회로가 없어서 외부 입력단자를 통해 선택신호를 입력해 주어야만 하는 문제점이 있었다. 본 고안의 목적은 이러한 종래의 문제점을 해결하기 위해 인가된 전원전압이 소정전압 이상이면 턴온되는 다이오드와, 상기 다이오드의 턴온 여부에 따라 양단전압이 달라지는 저항과, 상기 저항의 양단전압을 입력받아 이를 반전시켜 출력하는 인버터와, 상기 인버터의 출력신호에 따라 인가된 전원전압에 맞는 내부회로를 선택하기 위한 선택신호를 출력하는 멀티 플렉서로 구성된 전원전압 선택회로를 안출한 것으로, 그 작용으로 인해 인가된 전원전압의 크기에 따라 그 인가된 전압에 맞는 내부회로를 선택하여 동작시킬 수 있는 효과가 있다.The present invention relates to a power supply voltage selection circuit, and in a device operable at two power sources, there is no circuit that can detect the magnitude of the power supply voltage applied to the inside of the device. There was a problem that had to be entered. An object of the present invention is to receive a diode that is turned on if the applied power voltage is more than a predetermined voltage to solve this conventional problem, the resistance of the voltage across both ends according to whether the diode is turned on, and receives the voltage across the resistor Inverter outputs a power supply voltage selection circuit consisting of an inverter and a multiplexer for outputting a selection signal for selecting an internal circuit according to the power supply voltage applied according to the output signal of the inverter, due to the action According to the magnitude of the supplied power supply voltage, an internal circuit suitable for the applied voltage can be selected and operated.
Description
제1도는 본 고안 전원전압 선택회로도.1 is a power supply voltage selection circuit of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
100 : 전원전압 검출부 200 : 멀티 플렉서100: power supply voltage detection unit 200: multiplexer
D1 - Dn : 다이오드 R1 : 저항D1-Dn: Diode R1: Resistance
NOT1 : 인버터NOT1: inverter
본 고안은 전원전압 선택회로에 관한 것으로 특히 5V 및 3.3V에서 동작하는 소자에 있어서, 인가된 전원전압에 맞는 내부 회로를 선택할 수 있게 한 전원전압 선택회로에 관한 것이다.The present invention relates to a power supply voltage selection circuit, and more particularly, to a power supply voltage selection circuit that enables an internal circuit suitable for an applied power supply voltage to be selected for devices operating at 5V and 3.3V.
어떤 소자가 5V 또는 3.3V 전원에서 사용 가능한 경우, 입력 버퍼의 신호(특히, TTL 입력) 레벨을 인가되는 전원전압에 맞도록 선택해 주어야 한다. 이를 위해서는 인가된 전원전압이 5V 인지 3.3V 인지를 감지할 수 있는 회로가 필요하다.If a device is available on a 5V or 3.3V supply, the signal (especially TTL input) level of the input buffer must be selected to match the applied supply voltage. This requires a circuit that can detect whether the applied power supply voltage is 5V or 3.3V.
그러나 종래에는 소자 내부에 이를 감지할 수 있는 회로가 없어서 외부 입력단자를 통해 선택신호를 입력해 주어야만 하는 문제점이 있었다.However, in the related art, there is a problem in that a selection signal must be inputted through an external input terminal because there is no circuit capable of detecting the same inside the device.
본 고안의 목적은 이러한 종래의 문제점을 해결하기 위해, 인가된 전원전압의 크기에 따라 그 인가된 전압에 맞는 내부회로를 선택할 수 있게 한 전원전압 선택회로를 제공하는데 있다.An object of the present invention is to provide a power supply voltage selection circuit that can select an internal circuit suitable for the applied voltage in accordance with the magnitude of the applied power supply voltage, in order to solve this conventional problem.
상기 본 고안의 목적을 해결하기 위한 전원전압 선택회로는 인가된 전원전압의 크기에 따른 로직신호를 출력하는 전원전압 검출부와, 상기 전원전압 검출부의 출력신호에 따라 인가된 전원전압에 맞는 내부회로를 선택하기 위한 선택신호를 출력하는 멀티플렉서로 구성한다.The power supply voltage selection circuit for solving the object of the present invention has a power supply voltage detector for outputting a logic signal according to the magnitude of the applied power supply voltage, and an internal circuit suitable for the power supply voltage applied according to the output signal of the power supply voltage detection unit. The multiplexer outputs a selection signal for selection.
상기 전원전압 검출부는 인가된 전원전압이 소정전압 이상이면 턴온되는 다이오드와, 상기 다이오드의 턴온 여부에 따라 양단전압이 달라지는 저항과, 상기 저항의 양단전압을 입력받아 이를 반전시켜 출력하는 인버터로 구성한다.The power supply voltage detector includes a diode that is turned on when the applied power supply voltage is greater than or equal to a predetermined voltage, a resistor having a voltage different at both ends according to whether the diode is turned on, and an inverter that receives and outputs the voltage at both ends of the resistor. .
이하, 본 고안의 작용 및 효과를 일실시예를 도시한 제 1도를 참조하여 상세히 설명하면 다음과 같다.Hereinafter, the operation and effects of the present invention will be described in detail with reference to FIG. 1 showing an embodiment.
제1도는 본 고안이 적용된 전원전압 선택회로도로서, 이에 도시한 바와 같이 인가된 전원전압이 소정전압(5V) 이상이면 턴온되는 다이오드(D1-Dn)와, 상기 다이오드(D1-Dn)의 턴온 여부에 따라 양단전압이 달라지는 저항(R1)과, 상기 저항(R1)의 양단전압(0V 또는 1V)을 입력받아 이를 반전시켜 출력하는 인버터(NOT1)와, 상기 인버터(NOT1)의 출력신호에 따라 인가된 전원전압(5V 또는 3.3V)에 맞는 내부회로를 선택하기 위한 선택신호를 출력하는 멀티 플렉서(200)로 구성한다.1 is a power supply voltage selection circuit diagram to which the present invention is applied. According to the resistor R1 having a different voltage across the inverter, an inverter NOT1 that receives the opposite voltage (0V or 1V) of the resistor R1 and inverts it and outputs the same, according to an output signal of the inverter NOT1. The multiplexer 200 outputs a selection signal for selecting an internal circuit suitable for the supplied power supply voltage (5V or 3.3V).
이와같이 구성한 본 고안이 적용된 회로의 동작을 살펴보면 다음과 같다.Looking at the operation of the circuit to which the present invention configured as described above is as follows.
먼저, 소정갯수의 다이오드(D1-Dn)를 직렬로 연결하여 턴온 전압이 약4V 정도가 되도록 다이오드 단수를 조절한다. 이와같이 연결한 상태에서 5V인 전원전압이 인가되면 다이오드(D1-Dn)가 턴온되어 저항(R1)에 전류가 흐르게 되고 이에따라 접점(A)에 1V정도의 전압이 걸린다.First, by connecting a predetermined number of diodes (D1-Dn) in series to adjust the number of diode stages so that the turn-on voltage is about 4V. When a power supply voltage of 5V is applied in the connected state, the diodes D1 -Dn are turned on so that a current flows through the resistor R1. Accordingly, a voltage of about 1V is applied to the contact A.
이로인해 인버터(NOT1)는 '로우'신호를 출력하여 멀티플렉서(200)에 입력한다. 이에따라 멀티 플렉서(200)는 5V에서 동작하는 회로를 선택하기 위한 선택신호를 출력한다.As a result, the inverter NOT1 outputs a 'low' signal to the multiplexer 200. Accordingly, the multiplexer 200 outputs a selection signal for selecting a circuit operating at 5V.
만약, 인가된 전원전압이 3.3V이면 다이오드(D1-Dn)는 턴온되지 못하여 저항(R1)에는 전류가 흐르지 못해 접점(A)의 전압은 0V가 된다. 이에따라 인버터 (NOT1)는 '하이'신호를 출력한다.If the applied power supply voltage is 3.3V, the diodes D1 -Dn cannot be turned on, so no current flows through the resistor R1, and the voltage of the contact A becomes 0V. In response, inverter NOT1 outputs a high signal.
상기 인버터(NOT1)로부터 '하이'신호를 입력받은 멀티 플렉서(200)는 3.3V에서 동작하는 회로를 선택하기 위한 선택신호를 출력한다.The multiplexer 200 receiving the 'high' signal from the inverter NOT1 outputs a selection signal for selecting a circuit operating at 3.3V.
즉, 상기 인버터(NOT1)의 출력신호가 '하이'이면 3.3V에서 동작하는 회로를 선택하고, 인버터(NOT1)의 출력신호가 '로우'이면 5V에서 동작하는 회로를 선택한다.That is, when the output signal of the inverter NOT1 is 'high', a circuit operating at 3.3V is selected. When the output signal of the inverter NOT1 is 'low', a circuit operating at 5V is selected.
이상에서 상세히 설명한 바와같이 본 고안은 두가지 전원에서 사용할 수 있는 소자에 있어서, 외부단자로부터의 선택신호 없이도 인가된 전원전압의 크기를 검출하여 그 인가된 전원전압에서 동작하는 회로를 선택하여 동작 시킬 수 있는 효과가 있다.As described in detail above, the present invention can detect a magnitude of an applied power supply voltage without a selection signal from an external terminal, and select and operate a circuit operating at the applied power supply voltage in a device that can be used in two power supplies. It has an effect.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019940026849U KR0119736Y1 (en) | 1994-10-14 | 1994-10-14 | Source voltage selecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019940026849U KR0119736Y1 (en) | 1994-10-14 | 1994-10-14 | Source voltage selecting circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR960015734U KR960015734U (en) | 1996-05-17 |
| KR0119736Y1 true KR0119736Y1 (en) | 1998-08-01 |
Family
ID=19395512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019940026849U Expired - Lifetime KR0119736Y1 (en) | 1994-10-14 | 1994-10-14 | Source voltage selecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR0119736Y1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200087477A (en) * | 2019-01-11 | 2020-07-21 | 공주대학교 산학협력단 | Apparatus and method for deciding logic of logic lab unit |
-
1994
- 1994-10-14 KR KR2019940026849U patent/KR0119736Y1/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200087477A (en) * | 2019-01-11 | 2020-07-21 | 공주대학교 산학협력단 | Apparatus and method for deciding logic of logic lab unit |
Also Published As
| Publication number | Publication date |
|---|---|
| KR960015734U (en) | 1996-05-17 |
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