WO2005064795A1 - 信号出力回路及びそれを有する電源電圧監視装置 - Google Patents
信号出力回路及びそれを有する電源電圧監視装置 Download PDFInfo
- Publication number
- WO2005064795A1 WO2005064795A1 PCT/JP2004/018997 JP2004018997W WO2005064795A1 WO 2005064795 A1 WO2005064795 A1 WO 2005064795A1 JP 2004018997 W JP2004018997 W JP 2004018997W WO 2005064795 A1 WO2005064795 A1 WO 2005064795A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transistor
- current
- output
- signal
- power supply
- Prior art date
Links
- 238000012806 monitoring device Methods 0.000 title claims description 25
- 238000012544 monitoring process Methods 0.000 claims description 16
- 238000010586 diagram Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0036—Means reducing energy consumption
Definitions
- the present invention relates to a signal output circuit that outputs an output signal from an NPN bipolar transistor, and a power supply voltage monitoring device that outputs a power supply voltage monitoring signal from the signal output circuit.
- a system including an electronic circuit generates a power supply voltage monitoring signal (reset signal) for stopping a system operation when the power supply voltage is lower than a predetermined value in order to prevent a malfunction due to a power supply voltage that is an applied voltage.
- a power supply voltage monitoring device (reset device) for outputting is widely used (for example, Patent Document 1).
- FIG. 2 shows a conventional power supply voltage monitoring device.
- the power supply voltage monitoring device 101 outputs a power supply voltage monitoring signal indicating when the power supply voltage V to be monitored is lower than a predetermined value to an output terminal O
- a signal output circuit 102 that outputs to the UT, and a series-connected resistive element that divides the power supply voltage V
- reference voltage generation circuit 22 that generates reference voltage V, and resistance element connected in series
- the voltage at the midpoint between 23 and 24 is input to the non-inverting input terminal, the reference voltage V generated by the reference voltage generation circuit 22 is input to the inverting input terminal, and they are compared.
- Comparator 25 which is an input signal of the signal output circuit 102, a pull-down resistor element 26 connected to the output of the comparator 25 and having the other end grounded, and a power supply terminal of the reference voltage generation circuit 22 and the comparator 25. And a constant voltage generation circuit 21 for supplying a predetermined constant voltage V to the power supply.
- the signal output circuit 102 includes an output transistor of an NPN-type bipolar transistor that outputs a power supply voltage monitoring signal to an output terminal OUT, and an output transistor 110 that turns on and off in response to an input signal.
- the base potential is lowered to turn off the output transistor 110, and when turned off, the base potential of the output transistor 110 is raised to turn on the output transistor 110.
- Source (supply voltage v) power Base current that supplies current to the base of output transistor 110
- a supply resistance element 112 and a force are also configured.
- the reason that the output transistor 110 is an NPN type bipolar transistor is that the voltage on the ground side input to another electronic circuit (not shown) connected to the output terminal OUT is surely dropped near the ground potential. That's why.
- the reference voltage V (for example, 0.7 V) of the power supply voltage monitoring device 101 requires high accuracy.
- the reference voltage generation circuit 22 is configured using, for example, a band gap voltage source.
- the constant voltage V for example, 4 V
- the comparator 25 stably operates the reference voltage generation circuit 22 and the comparator 25.
- the constant voltage generation circuit 21 has a relatively simple configuration mainly including, for example, diodes connected in series.
- the output of the constant voltage generation circuit 21 becomes high impedance if the input power supply voltage V is equal to or lower than the constant voltage V, and therefore the output of the comparator
- the output of 25 also becomes high impedance, and the input signal of the signal output circuit 102 is fixed at the ground potential level by the pull-down resistor 26. That is, until the reference voltage generation circuit 22 and the comparator 25 operate, the output transistor 110 is reliably turned on, and the power supply voltage monitoring signal indicates that the power supply voltage V is lower than the predetermined value.
- the power supply voltage monitoring device 101 If the input power supply voltage V is higher than the constant voltage V, the power supply voltage monitoring device 101
- the comparator 25 If the voltage is lower than the reference voltage V, the comparator 25 outputs a low level as a comparison output signal.
- the signal is output to the path 102, whereby the ground-side output control transistor 111 is turned off. As a result, the output transistor 110 is turned on, and the power supply voltage monitoring signal indicates that the power supply voltage V has exceeded the predetermined value.
- the current I flowing through the base current supply resistance element 112 becomes the base current of the output transistor 110, and the output current I obtained by multiplying this base current by the current amplification factor (h) is output.
- the output current I is connected to the power supply voltage monitoring signal
- the resistance value of the base current supply resistance element 112 is considered in consideration of the value of the output current I.
- the base current of the output transistor 110 needs to be 10 A. Power supply voltage V As a result, if the output transistor 110 is turned on, the resistance element 112 for supplying the base current has a resistance value of about 1 ⁇ .
- the comparator 25 performs comparison.
- a low level is output to the signal output circuit 102 as an output, whereby the ground-side output control transistor 111 is turned on.
- the potential of the base of the output transistor 110 drops and the output transistor 110 turns off, and the power supply voltage monitoring signal indicates that the power supply voltage V is lower than the predetermined value.
- This current I is, for example, approximately 10 A under the above conditions.
- Patent Document 1 JP-A-11-220370
- the power supply voltage monitoring device 101 monitors the power supply voltage V and outputs the power supply voltage V power s
- the output transistor 110 of the signal output circuit 102 turns on, and when the value is higher than the predetermined value, the output transistor 110 turns off.
- the current I flowing through the base current supply resistance element 112 is a necessary current when the output transistor 110 is turned on, which is a necessary current when the output transistor 110 is turned off.
- the power supply voltage V increases, the current consumption further increases.
- the boundary of the power supply voltage V at which the transistor 110 turns on or off is set to 10 V, and the power supply voltage V
- the unnecessary power flowing through the base current supply resistor 112 is c.
- the current I is 30 ⁇ .
- the present invention has been made in view of the above-described circumstances, and an object of the present invention is to reduce a current consumption while securing a necessary base current of an output transistor of an NPN-type bipolar transistor. And a power supply voltage monitoring device having the same.
- a signal output circuit An NPN type bipolar transistor that outputs an output signal and an output transistor that turns on and off according to the input signal, drops the base potential of the output transistor when turned on, turns off the output transistor, and turns off when turned off
- a ground-side output control transistor that raises the potential of the base of the transistor to turn on the output transistor, a base current supply resistance element that supplies current to the base of the input power supply output transistor, and a base current supply resistance element
- a power supply-side output control transistor that is interposed between the base of the output transistor and turns off and on in response to an input signal, and turns off and on in response to an input signal.
- the signal output circuit desirably includes an inverting circuit that inputs a voltage between the ground-side current bypass transistor and the current-limiting resistance element, inverts the voltage, and controls the power-supply-side output control transistor. Further provision.
- the signal output circuit further includes a second current limiting resistor connected to the output of the inverting circuit.
- the ground-side output control transistor, the power-supply-side output control transistor, and the ground-side current bypass transistor are MOS transistors.
- the base current supply resistance element, the current restriction resistance element, and the second current restriction resistance element are preferably resistors.
- a power supply voltage monitoring device is a power supply voltage monitoring device having the above-described signal output circuit, and includes a series-connected resistance element for dividing a power supply voltage, and a reference for generating a reference voltage.
- a voltage generation circuit, and a comparator that compares a voltage at an intermediate point between the series-connected resistance elements and a reference voltage generated by the reference voltage generation circuit, and outputs a comparison output as an input signal of a signal output circuit. And outputs the output signal of the signal output circuit as a power supply voltage monitoring signal.
- a signal output circuit and a power supply voltage monitoring device having the same provide a base current supply resistor through a current limiting resistor when an output transistor of the signal output circuit is off.
- the current from the transistor flows into the ground-side current bypass transistor, so that the current consumption can be reduced.
- FIG. 1 is a circuit diagram of a signal output circuit according to an embodiment of the present invention and a power supply voltage monitoring device having the same.
- FIG. 2 is a circuit diagram of a conventional signal output circuit and a power supply voltage monitoring device having the same. Explanation of symbols
- FIG. 1 is a circuit diagram of a signal output circuit according to an embodiment of the present invention and a power supply voltage monitoring device having the same.
- the power supply voltage monitoring device 1 has a signal output circuit different from that of the conventional power supply voltage monitoring device 101, and includes the same components as those of the power supply voltage monitoring device 101 in other respects. That is, when the power supply voltage V to be monitored is lower than the predetermined value, the power supply voltage monitoring device 1 A signal output circuit 2 that outputs a power supply voltage monitoring signal indicating this to the output terminal OUT, series-connected resistance elements 23 and 24 that divide the power supply voltage V, and a reference that generates the reference voltage V
- the voltage at the midpoint between the voltage generating circuit 22 and the series-connected resistance elements 23 and 24 is input to the non-inverting input terminal, and the reference voltage V generated by the reference voltage generating circuit 22 is input to the inverting input terminal.
- the comparator 25 receives and compares them, and a comparison output is used as an input signal of the signal output circuit 2, a pull-down resistor element 26 connected to the output of the comparator 25 and having the other end grounded, and a reference voltage.
- a constant voltage generator that supplies a predetermined constant voltage V to the power supply terminals of the generation circuit 22 and the comparator 25
- the signal output circuit 2 When the signal output circuit 2 is turned on / off in response to an input signal and the output transistor 10 of an NPN type bipolar transistor that outputs a power supply voltage monitoring signal, which is an output signal of the signal output circuit 2, to an output terminal OUT, and is turned on.
- the potential of the base of the output transistor 10 is lowered to turn off the output transistor 10, and when turned off, the potential of the base of the output transistor 10 is raised to turn on the output transistor 10.
- the N-type MOS transistor ground-side output control transistor 11 The input power (power supply voltage V) also supplies a current to the base of the output transistor 10 cc.
- the base current supply resistance element 12 of the supplied resistance, and the base current supply resistance element 12 and the base of the output transistor 10 are interposed between the base current supply resistance element 12 and the base of the output transistor 10. Turns on and off The power-side output control transistor 13 of the P-type MOS transistor and the ground-side output control transistor 11 in response to an input signal in the same manner as the ground-side output control transistor 11, and when turned on, the current of the base current supply resistor 12 flows When turned off, the current of the base current supply resistor 12 is prevented from flowing.
- the ground-side current bypass transistor 14 of the N-type MOS transistor and the ground-side current bypass transistor 14 and the base current supply resistor 12 And a current limiting resistor element 15 of a resistor interposed therebetween as a main constituent element.
- the signal output circuit 2 receives a voltage between the ground side current bypass transistor 14 and the current limiting resistance element 15 and inverts the voltage to control the power supply side output control transistor 13 as an inverting circuit.
- a P-type MOS transistor 16 and an N-type MOS transistor 17 are connected in series between the base current supply resistance element 12 and the current limiting resistance element 15 to the ground potential.
- the output of the inverting circuit that is, P A second current limiting resistor 18 having a resistance connected to a connection point between the N-type MOS transistor 16 and the N-type MOS transistor 17 is provided.
- the comparator 25 If the voltage is lower than the reference voltage V, the comparator 25 outputs a low level as a comparison output signal.
- the output is output to the path 2, whereby the ground-side output control transistor 11 is turned off.
- the ground-side current bypass transistor 14 is also turned off, the voltage between the transistor 14 and the current-limiting resistor 15 increases, and the N-type MOS transistor 17 is turned on.
- the resistance value of the base current supply resistance element 12 is R
- the current I is substantially equal to V ZR.
- this base current is multiplied by the current amplification factor (h).
- the output current I of CC 1 FE flows through the output transistor 10. Output current I is output via output terminal OUT.
- a high level is output to the signal output circuit 2 as an output, whereby the ground-side output control transistor 11 is turned on.
- the ground-side current no-pass transistor 14 is turned on, and the voltage between the transistor 14 and the current-limiting resistor 15 is at the ground potential level, and the N-type MOS transistor 17 is turned off.
- a current flows through the current limiting resistor element 15 and the P-type MO
- the S transistor 16 turns on. Therefore, the voltage at the connection point between the P-type MOS transistor 16 and the N-type MOS transistor 17 becomes high level, the power supply side output control transistor 13 is turned off, and a current flows through the second current limiting resistance element 18. . Thus, the ground-side output control transistor 11 lowers the potential of the base of the output transistor 10 to
- the current I flowing through the current-supplying resistor 12 is equal to the current I flowing through the current-limiting resistor 15.
- the current I is approximately V / (R + (R R) / (
- the resistance value R of the base current supply resistance element 12 is determined in consideration of the value of the output current I when the output transistor 10 is on.
- the resistance values R and R of the current limiting resistor 18 are determined by the power-supply-side output control transistor 13 and P
- the withstand voltage of a normal MOS transistor is about 10 V to 15 V, so that the power supply voltage V is higher than that.
- a current is caused to flow through the base current supply resistance element 12 so that the voltage applied to the transistor element (the power supply side output control transistor 13 and the P-type MOS transistor 16) becomes equal to or less than the withstand voltage, thereby causing a voltage drop.
- the transistor element withstand voltage is 15 V and the input power supply voltage V power rises to 3 ⁇ 4OV, the resistance values R and R are both doubled.
- the voltage applied to the element when the output transistor 10 is off can be suppressed to 15V.
- the resistance value of the base current supply resistor element 12 is set to 1 M ⁇
- the resistance values R and R of the current limiting resistor element 15 and the second current limiting resistor element 18 are set to 2 ⁇ .
- the current I flowing through the supply resistance element 12 is 15 A.
- the useless current I flowing through the base current supply resistance element 12 when the output transistor 10 is off can be reduced, and the power consumption of the signal output circuit 2 and the power supply voltage monitoring device 1 can be reduced. it can.
- the second current limiting resistance element 18 is connected to the power supply voltage V when the power supply voltage V is turned on.
- the resistance value R of the current limiting resistance element 15 needs to be reduced (for example, to 1 ⁇ ) in consideration of the transistor element withstand voltage.
- the output control transistor on the power supply side is turned off. If the voltage is sufficient to turn off the transistor 13, the input signal of the signal output circuit 2 can be directly input to the power-supply-side output control transistor 13. In this case, it is necessary to further reduce the resistance value R of the current limiting resistance element 15, and the output transistor 10 is turned off.
- the useless current I flowing through the base current supply resistor 12 increases slightly, but the inversion circuit consisting of the P-type MOS transistor 16 and the N-type MOS transistor 17 and the second current limiting resistor 18 are unnecessary. It becomes.
- the signal output circuit 2 is devised as a suitable one for the power supply voltage monitoring device 1, the power supply voltage V of the output stage is relatively high and the NPN type is used.
- No. ⁇ It is also possible to use the output of the bipolar transistor, for example, for the signal output of a motor drive device or the like.
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- Electronic Switches (AREA)
- Control Of Voltage And Current In General (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/596,727 US20070146016A1 (en) | 2003-12-26 | 2004-12-20 | Signal output circuit and power source voltage monitoring device using the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003435187A JP3881337B2 (ja) | 2003-12-26 | 2003-12-26 | 信号出力回路及びそれを有する電源電圧監視装置 |
JP2003-435187 | 2003-12-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005064795A1 true WO2005064795A1 (ja) | 2005-07-14 |
Family
ID=34736596
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/018997 WO2005064795A1 (ja) | 2003-12-26 | 2004-12-20 | 信号出力回路及びそれを有する電源電圧監視装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20070146016A1 (ja) |
JP (1) | JP3881337B2 (ja) |
KR (1) | KR20060131794A (ja) |
CN (1) | CN1898868A (ja) |
TW (1) | TW200525328A (ja) |
WO (1) | WO2005064795A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8198875B2 (en) * | 2009-09-15 | 2012-06-12 | Seiko Instruments Inc. | Voltage regulator |
JP6500588B2 (ja) * | 2015-05-15 | 2019-04-17 | ミツミ電機株式会社 | レギュレータ用半導体集積回路 |
JP7327980B2 (ja) * | 2019-04-11 | 2023-08-16 | ローム株式会社 | 電圧監視装置 |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02238712A (ja) * | 1989-03-13 | 1990-09-21 | Toshiba Corp | 出力バッファ回路 |
JPH044608A (ja) * | 1990-04-20 | 1992-01-09 | Sharp Corp | 電圧駆動型素子の駆動回路 |
JPH04245470A (ja) * | 1991-01-30 | 1992-09-02 | Nec Corp | バッファ回路 |
JPH04321315A (ja) * | 1991-04-19 | 1992-11-11 | Nec Corp | パワーオンリセット装置 |
JPH06188707A (ja) * | 1992-12-17 | 1994-07-08 | Toshiba Corp | 電圧検知回路 |
JPH08191238A (ja) * | 1995-01-11 | 1996-07-23 | Omron Corp | 半導体出力回路 |
JPH0936719A (ja) * | 1995-07-17 | 1997-02-07 | Toshiba Microelectron Corp | 高速スイッチング回路 |
JPH09213893A (ja) * | 1996-02-06 | 1997-08-15 | Nec Corp | 半導体装置 |
JPH11220370A (ja) * | 1998-01-29 | 1999-08-10 | Oki Micro Design Miyazaki Co Ltd | リセット回路及びこれを内蔵した電子装置 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02250526A (ja) * | 1989-03-24 | 1990-10-08 | Nec Corp | 半導体集積回路 |
KR920010212B1 (ko) * | 1989-12-29 | 1992-11-21 | 삼성전자 주식회사 | 바이씨모스 ttl레벨 출력구동회로 |
-
2003
- 2003-12-26 JP JP2003435187A patent/JP3881337B2/ja not_active Expired - Fee Related
-
2004
- 2004-12-20 KR KR1020067012802A patent/KR20060131794A/ko not_active Application Discontinuation
- 2004-12-20 WO PCT/JP2004/018997 patent/WO2005064795A1/ja active Application Filing
- 2004-12-20 US US10/596,727 patent/US20070146016A1/en not_active Abandoned
- 2004-12-20 CN CNA2004800389404A patent/CN1898868A/zh active Pending
- 2004-12-22 TW TW093139963A patent/TW200525328A/zh unknown
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02238712A (ja) * | 1989-03-13 | 1990-09-21 | Toshiba Corp | 出力バッファ回路 |
JPH044608A (ja) * | 1990-04-20 | 1992-01-09 | Sharp Corp | 電圧駆動型素子の駆動回路 |
JPH04245470A (ja) * | 1991-01-30 | 1992-09-02 | Nec Corp | バッファ回路 |
JPH04321315A (ja) * | 1991-04-19 | 1992-11-11 | Nec Corp | パワーオンリセット装置 |
JPH06188707A (ja) * | 1992-12-17 | 1994-07-08 | Toshiba Corp | 電圧検知回路 |
JPH08191238A (ja) * | 1995-01-11 | 1996-07-23 | Omron Corp | 半導体出力回路 |
JPH0936719A (ja) * | 1995-07-17 | 1997-02-07 | Toshiba Microelectron Corp | 高速スイッチング回路 |
JPH09213893A (ja) * | 1996-02-06 | 1997-08-15 | Nec Corp | 半導体装置 |
JPH11220370A (ja) * | 1998-01-29 | 1999-08-10 | Oki Micro Design Miyazaki Co Ltd | リセット回路及びこれを内蔵した電子装置 |
Also Published As
Publication number | Publication date |
---|---|
JP2005197787A (ja) | 2005-07-21 |
KR20060131794A (ko) | 2006-12-20 |
CN1898868A (zh) | 2007-01-17 |
US20070146016A1 (en) | 2007-06-28 |
TW200525328A (en) | 2005-08-01 |
JP3881337B2 (ja) | 2007-02-14 |
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