JPH04131777U - Power supply voltage monitoring circuit when power is turned off - Google Patents
Power supply voltage monitoring circuit when power is turned offInfo
- Publication number
- JPH04131777U JPH04131777U JP4735891U JP4735891U JPH04131777U JP H04131777 U JPH04131777 U JP H04131777U JP 4735891 U JP4735891 U JP 4735891U JP 4735891 U JP4735891 U JP 4735891U JP H04131777 U JPH04131777 U JP H04131777U
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- Prior art keywords
- voltage
- power supply
- resistor
- turned
- power
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- 238000012544 monitoring process Methods 0.000 title claims description 9
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
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- Measurement Of Current Or Voltage (AREA)
Abstract
(57)【要約】
【目的】 電源１をオフにしたとき、電源１の出力電圧
が０になったかどうかを監視する。
【構成】 電源１の出力電圧を抵抗２Ａと抵抗２Ｂで分
圧し、抵抗２Ａと抵抗２Ｂの接続点と電源３の間に抵抗
２Ｃを接続し、前記分圧電圧を電圧比較器４Ａの第１の
入力端子に接続し、前記分圧電圧を電圧比較器４Ｂの第
３の入力端子に接続し、電源３と接地間に直列に抵抗２
Ｄと定電圧ダイオード５と抵抗２Ｅを接続し、定電圧ダ
イオード５と並列に可変抵抗６Ａを接続し、定電圧ダイ
オード５と並列に可変抵抗６Ｂを接続し、抵抗２Ｅと並
列にスイッチ７を接続する。
(57) [Summary] [Purpose] Monitor whether the output voltage of power supply 1 becomes 0 when power supply 1 is turned off. [Structure] The output voltage of the power supply 1 is divided by a resistor 2A and a resistor 2B, a resistor 2C is connected between the connection point of the resistors 2A and 2B and the power supply 3, and the divided voltage is applied to the first voltage comparator 4A. The divided voltage is connected to the third input terminal of the voltage comparator 4B, and a resistor 2 is connected in series between the power supply 3 and the ground.
Connect D to constant voltage diode 5 and resistor 2E, connect variable resistor 6A in parallel to constant voltage diode 5, connect variable resistor 6B in parallel to constant voltage diode 5, and connect switch 7 in parallel to resistor 2E. do.
Description
【０００１】0001
この考案は、電源をオフにしたとき、電源の電圧が０であることを検出する電 圧監視回路についてのものである。 This idea is based on an electric current that detects that the voltage of the power supply is 0 when the power is turned off. This is about the pressure monitoring circuit.
【０００２】0002
次に、従来技術による電源の電圧監視回路の構成を図２により説明する。図２ の１は電源、２Ａと２Ｂと２Ｄは抵抗、３は電源、４Ａと４Ｂは電圧比較器、５ は定電圧ダイオード、６Ａと６Ｂは可変抵抗、８は入力端子、９は出力端子であ る。 Next, the configuration of a power supply voltage monitoring circuit according to the prior art will be explained with reference to FIG. Figure 2 1 is a power supply, 2A, 2B and 2D are resistors, 3 is a power supply, 4A and 4B are voltage comparators, 5 is a constant voltage diode, 6A and 6B are variable resistors, 8 is an input terminal, and 9 is an output terminal. Ru.
【０００３】 電源１の出力は、入力端子８と接地間に接続された抵抗２Ａと抵抗２Ｂで分圧 され、電圧比較器４Ａの＋入力端子と電圧比較器４Ｂの−入力端子に接続される 。電源３と接地間には、抵抗２Ｄと定電圧ダイオード５が直列に接続され、定電 圧ダイオード５には可変抵抗６Ａ・６Ｂが並列に接続される。可変抵抗６Ａの出 力は電圧比較器４Ａの−入力端子に接続され、可変抵抗６Ｂの出力は電圧比較器 ４Ｂの＋入力端子に接続される。0003 The output of power supply 1 is divided by resistor 2A and resistor 2B connected between input terminal 8 and ground. and connected to the + input terminal of the voltage comparator 4A and the - input terminal of the voltage comparator 4B. . A resistor 2D and a constant voltage diode 5 are connected in series between the power supply 3 and the ground. Variable resistors 6A and 6B are connected to the pressure diode 5 in parallel. Output of variable resistor 6A The power is connected to the − input terminal of the voltage comparator 4A, and the output of the variable resistor 6B is connected to the voltage comparator 4A. Connected to the + input terminal of 4B.
【０００４】 例えば、電源１と電源３の出力電圧が５Ｖのとき、電圧比較器４Ａの入力が5. 5 Ｖ以上になると電圧比較器４Ａから出力が出るように可変抵抗６Ａを調整する 。また、電圧比較器４Ｂの入力が4.5 Ｖ以下になると電圧比較器４Ｂから出力が 出るように可変抵抗６Ｂを調整する。これにより、電源１の出力電圧が 4.5〜 5 .5Ｖの範囲では正常とし、 4.5Ｖ以下または 5.5Ｖ以上では異常として警報を出 すことができる。0004 For example, when the output voltages of power supplies 1 and 3 are 5V, the input of voltage comparator 4A is 5V. Adjust the variable resistor 6A so that the voltage comparator 4A outputs when the voltage exceeds 5 V. . Also, when the input of voltage comparator 4B becomes 4.5 V or less, the output from voltage comparator 4B becomes Adjust the variable resistor 6B so that it appears. As a result, the output voltage of power supply 1 is 4.5 to 5 It is considered normal in the range of .5V, and an alarm is issued as abnormal when it is below 4.5V or above 5.5V. can be done.
【０００５】[0005]
図２では、電源１の出力電圧が正常かどうかを監視することはできるが、電源 １がオフの状態を監視することはできない。電源１をオフにしても、実際の電圧 がオフにならないと、電源１の電圧がそのまま負荷に供給されることになる。電 圧の異なる複数の電源が供給されるＩＣテスタなどの電子機器では、電源をオフ にしたのに、電源電圧が供給されたままでいると、電子機器が焼損することがあ る。この考案は、電源１をオフにしたとき、電源１の出力電圧が０になったかど うかを監視する電源電圧監視回路の提供を目的とする。 In Figure 2, although it is possible to monitor whether the output voltage of power supply 1 is normal, It is not possible to monitor the state where 1 is off. Even if power supply 1 is turned off, the actual voltage If the power supply 1 is not turned off, the voltage of the power supply 1 will be supplied to the load as is. electric For electronic equipment such as IC testers that are supplied with multiple power supplies with different voltages, turn off the power. If the power supply voltage is left on even after the power supply is turned on, electronic equipment may burn out. Ru. This idea is based on whether the output voltage of power supply 1 becomes 0 when power supply 1 is turned off. The purpose of this invention is to provide a power supply voltage monitoring circuit that monitors whether
【０００６】[0006]
この目的を達成するため、この考案では、電源１の出力電圧を分圧する抵抗２ Ａと抵抗２Ｂと、抵抗２Ａと抵抗２Ｂの接続点と電源３の間に接続される抵抗２ Ｃと、前記分圧電圧が第１の入力端子に接続される電圧比較器４Ａと、前記分圧 電圧が第３の入力端子に接続される電圧比較器４Ｂと、電源３と接地間に直列に 接続される抵抗２Ｄと定電圧ダイオード５と抵抗２Ｅと、定電圧ダイオード５と 並列に接続され、電圧比較器４Ａの第２の入力端子の電圧を調整する可変抵抗６ Ａと、定電圧ダイオード５と並列に接続され、電圧比較器４Ｂの第４の入力端子 の電圧を調整する可変抵抗６Ｂと、抵抗２Ｅと並列に接続されるスイッチ７とを 備え、電源１がオンのときはスイッチ７をオフにし、電源１がオフのときはスイ ッチ７をオンにする。 In order to achieve this purpose, this invention uses a resistor 2 that divides the output voltage of the power supply 1. A and resistor 2B, and resistor 2 connected between the connection point of resistor 2A and resistor 2B and power supply 3. C, a voltage comparator 4A to which the divided voltage is connected to a first input terminal, and the divided voltage A voltage comparator 4B, the voltage of which is connected to the third input terminal, is connected in series between the power supply 3 and ground. The connected resistor 2D, constant voltage diode 5, resistor 2E, and constant voltage diode 5 A variable resistor 6 connected in parallel and adjusting the voltage of the second input terminal of the voltage comparator 4A A and the fourth input terminal of the voltage comparator 4B, which is connected in parallel with the voltage regulator diode 5. A variable resistor 6B that adjusts the voltage of , and a switch 7 connected in parallel with the resistor 2E. In preparation, turn off switch 7 when power supply 1 is on, and turn off switch 7 when power supply 1 is off. switch 7 on.
【０００７】[0007]
次に、この考案による電源電圧監視回路の構成を図１により説明する。図１の ２Ｃと２Ｅは抵抗、７はスイッチであり、その他の部分は図２と同じものである 。すなわち、図１は図２に抵抗２Ｃ・２Ｅとスイッチ７を追加したものである。 スイッチ７は電源１がオンのときはオフ、電源１がオフのときはオンにする。 Next, the configuration of the power supply voltage monitoring circuit according to this invention will be explained with reference to FIG. Figure 1 2C and 2E are resistors, 7 is a switch, and the other parts are the same as in Figure 2. . That is, FIG. 1 is the same as FIG. 2 except that resistors 2C and 2E and a switch 7 are added. The switch 7 is turned off when the power source 1 is on, and turned on when the power source 1 is off.
【０００８】 抵抗２Ｃは抵抗２Ａと抵抗２Ｂの接続点と電源３の間に接続され、抵抗２Ｅは 定電圧ダイオード５と接地間に接続される。図１は図２の回路を抵抗２Ｃと抵抗 ２Ｅでオフセット電圧を加えたものである。電源１がオフのときは入力端子８の 電圧は０になる。このとき、スイッチ７をオンにすれば、電圧０の監視回路が構 成される。電源１の電圧が０でなく、例えば５Ｖが出ていれば、出力端子９から 警報を出すことができる。[0008] Resistor 2C is connected between the connection point of resistor 2A and resistor 2B and power supply 3, and resistor 2E is connected between It is connected between the constant voltage diode 5 and ground. Figure 1 shows the circuit in Figure 2 with a resistor of 2C and a resistor. 2E plus an offset voltage. When power supply 1 is off, input terminal 8 The voltage becomes 0. At this time, if switch 7 is turned on, the voltage 0 monitoring circuit will be configured. will be accomplished. If the voltage of power supply 1 is not 0 and, for example, 5V is output, from output terminal 9 A warning can be issued.
【０００９】[0009]
電源１がオンのときは電圧比較器４Ａの＋端子と電圧比較器４Ｂの−端子の入 力電圧が３Ｖになり、電源１がオフのときは電圧比較器４Ａの＋端子と電圧比較 器４Ｂの−端子の入力電圧が１Ｖになるようにする。このときの抵抗２Ａ、２Ｂ 、２Ｃの値は次のとおりである。なお、電源３の電圧は５Ｖとする。 電源１の出力電圧が＋５Ｖのとき、抵抗２Ａ＝抵抗２Ｂ＝１ｋΩ、抵抗２Ｃ＝ ２ｋΩ。電源１の出力電圧が＋12Ｖのとき、抵抗２Ａ＝ 3.9ｋΩ、抵抗２Ｂ＝１ ｋΩ、抵抗２Ｃ＝ 3.3ｋΩ。電源１の出力電圧が＋15Ｖのとき、抵抗２Ａ＝５ｋ Ω、抵抗２Ｂ＝１ｋΩ、抵抗２Ｃ＝ 3.3ｋΩ。電源１の出力電圧が＋30Ｖのとき 、抵抗２Ａ＝11ｋΩ、抵抗２Ｂ＝１ｋΩ、抵抗２Ｃ＝ 3.6ｋΩ。電源１の出力電 圧が＋48Ｖのとき、抵抗２Ａ＝18ｋΩ、抵抗２Ｂ＝１ｋΩ、抵抗２Ｃ＝18ｋΩ。 When power supply 1 is on, the + terminal of voltage comparator 4A and the - terminal of voltage comparator 4B are connected. When the power voltage becomes 3V and power supply 1 is off, compare the voltage with the + terminal of voltage comparator 4A. The input voltage of the negative terminal of the device 4B is set to 1V. Resistances 2A and 2B at this time , 2C are as follows. Note that the voltage of the power source 3 is 5V. When the output voltage of power supply 1 is +5V, resistance 2A = resistance 2B = 1kΩ, resistance 2C = 2kΩ. When the output voltage of power supply 1 is +12V, resistance 2A = 3.9kΩ, resistance 2B = 1 kΩ, resistance 2C = 3.3kΩ. When the output voltage of power supply 1 is +15V, resistor 2A = 5k Ω, resistance 2B = 1kΩ, resistance 2C = 3.3kΩ. When the output voltage of power supply 1 is +30V , resistance 2A = 11kΩ, resistance 2B = 1kΩ, resistance 2C = 3.6kΩ. Output power of power supply 1 When the voltage is +48V, resistance 2A = 18kΩ, resistance 2B = 1kΩ, resistance 2C = 18kΩ.
【００１０】 定電圧ダイオード５の定電圧は負荷電流10ｍＡで約２Ｖのものを使用する。可 変抵抗６Ａ・６Ｂの負荷電流は、定電圧ダイオード５の負荷電流に影響しないよ う20ｋΩにする。抵抗２Ｄの抵抗値は 100Ω、抵抗２Ｅは 200Ωにする。可変抵 抗６Ａ・６Ｂの中間点は約１Ｖとなり、抵抗２Ｅの電圧降下を加算すると約３Ｖ の基準電圧が設定される。スイッチ７をオンにすると、可変抵抗６Ａ・６Ｂの中 間点に約１Ｖの基準電圧が設定される。0010 The constant voltage of the constant voltage diode 5 is approximately 2 V at a load current of 10 mA. Possible The load current of the variable resistors 6A and 6B should not affect the load current of the constant voltage diode 5. Set it to 20kΩ. The resistance value of resistor 2D is 100Ω, and the resistance value of resistor 2E is 200Ω. variable resistance The midpoint between resistors 6A and 6B is about 1V, and when you add the voltage drop of resistor 2E, it is about 3V. A reference voltage is set. When switch 7 is turned on, the inside of variable resistors 6A and 6B A reference voltage of approximately 1V is set between the points.
【００１１】[0011]
この考案によれば、図２の回路に抵抗２Ｃ・２Ｅと、スイッチ７を追加し、電 源１がオンのときはスイッチ５をオフにし、電源１がオフのときはスイッチ５を オンにするので、電源１がオフのとき、電源１の出力電圧が０になったかどうか を監視することができる。電源１をオフにしても、電源１の電圧が０にならない ときは、出力端子から警報を取り出すことができるので、電源１を確実にオフに することができる。 According to this idea, resistors 2C and 2E and switch 7 are added to the circuit shown in FIG. When power source 1 is on, switch 5 is turned off; when power source 1 is off, switch 5 is turned off. Since it is turned on, check whether the output voltage of power supply 1 becomes 0 when power supply 1 is off. can be monitored. Even if power supply 1 is turned off, the voltage of power supply 1 does not become 0. In this case, the alarm can be output from the output terminal, so be sure to turn off power supply 1. can do.
【図１】この考案による電源電圧監視回路の構成図であ
る。FIG. 1 is a configuration diagram of a power supply voltage monitoring circuit according to this invention.
【図２】従来技術による電源の電圧監視回路の構成図で
ある。FIG. 2 is a configuration diagram of a power supply voltage monitoring circuit according to the prior art.
１ 電源 ２Ａ〜２Ｅ 抵抗 ３ 電源 ４Ａ 電圧比較器 ４Ｂ 電圧比較器 ５ 定電圧ダイオード ６Ａ 可変抵抗 ６Ｂ 可変抵抗 ７ スイッチ 1 Power supply 2A~2E resistance 3 Power supply 4A voltage comparator 4B Voltage comparator 5 Constant voltage diode 6A variable resistance 6B variable resistance 7 Switch
Claims (1)
１の抵抗(2A)と第２の抵抗(2B)と、第１の抵抗(2A)と第
２の抵抗(2B)の接続点と第２の電源(3) の間に接続され
る第３の抵抗(2C)と、前記分圧電圧が第１の入力端子に
接続される第１の電圧比較器(4A)と、前記分圧電圧が第
３の入力端子に接続される第２の電圧比較器(4B)と、第
２の電源(3) と接地間に直列に接続される第４の抵抗(2
D)と定電圧ダイオード(5) と第５の抵抗(2E)と、定電圧
ダイオード(5) と並列に接続され、第１の電圧比較器(4
A)の第２の入力端子の電圧を調整する第１の可変抵抗(6
A)と、定電圧ダイオード(5) と並列に接続され、第２の
電圧比較器(4B)の第４の入力端子の電圧を調整する第２
の可変抵抗(6B)と、第５の抵抗(2E)と並列に接続される
スイッチ(7) とを備え、第１の電源(1) がオンのときは
スイッチ(7) をオフにし、第１の電源(1) がオフのとき
はスイッチ(7) をオンにすることを特徴とする電源をオ
フにしたときの電源の電圧監視回路。Claim 1: A first resistor (2A) and a second resistor (2B) that divide the output voltage of the first power supply (1), and a first resistor (2A) and a second resistor (2B). a third resistor (2C) connected between the connection point of and the second power supply (3); and a first voltage comparator (4A) to which the divided voltage is connected to the first input terminal. , a second voltage comparator (4B) to which the divided voltage is connected to the third input terminal, and a fourth resistor (2B) connected in series between the second power supply (3) and ground.
D), a constant voltage diode (5), a fifth resistor (2E), and a first voltage comparator (4) are connected in parallel with the constant voltage diode (5).
The first variable resistor (6
A) and a second voltage regulator connected in parallel with the voltage regulator diode (5) to adjust the voltage of the fourth input terminal of the second voltage comparator (4B).
variable resistor (6B) and a switch (7) connected in parallel with the fifth resistor (2E), when the first power supply (1) is on, the switch (7) is turned off, and the fifth A voltage monitoring circuit for a power supply when the power supply is turned off, characterized in that a switch (7) is turned on when the power supply (1) of No. 1 is turned off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4735891U JPH04131777U (en) | 1991-05-28 | 1991-05-28 | Power supply voltage monitoring circuit when power is turned off |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4735891U JPH04131777U (en) | 1991-05-28 | 1991-05-28 | Power supply voltage monitoring circuit when power is turned off |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04131777U true JPH04131777U (en) | 1992-12-04 |
Family
ID=31926463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4735891U Pending JPH04131777U (en) | 1991-05-28 | 1991-05-28 | Power supply voltage monitoring circuit when power is turned off |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04131777U (en) |
-
1991
- 1991-05-28 JP JP4735891U patent/JPH04131777U/en active Pending
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