CN1097764C - Automatic reset circuit - Google Patents
Automatic reset circuit Download PDFInfo
- Publication number
- CN1097764C CN1097764C CN97104228A CN97104228A CN1097764C CN 1097764 C CN1097764 C CN 1097764C CN 97104228 A CN97104228 A CN 97104228A CN 97104228 A CN97104228 A CN 97104228A CN 1097764 C CN1097764 C CN 1097764C
- Authority
- CN
- China
- Prior art keywords
- supply voltage
- mentioned
- resistance
- rising
- moment
- 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 - Fee Related
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Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/24—Resetting means
-
- 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
Abstract
The present invention relates to an automatic reset circuit capable of resetting processor and peripheral circuit to automatically relieve abnormity state of system in condition that instantaneous power voltage level is abnormal, the circuit includes a device (11) for detecting raise transfer of power voltage; a device (12) for detecting reference time for effective reset, and a reset impulse output device (13).
Description
Technical field
The present invention relates to a kind of automatic reset circuit, owing to instantaneous mains voltage level becomes under the situation of abnormality system unusually, microprocessor and peripheral circuit are resetted, and automatically terminate the abnormality of system.
Background technology
The reset circuit of United States Patent (USP) No. 4683568 (1987.7.28) or German patent application 2187909A number (1987,9,16) is to constitute energising (Power-on) reset circuit and supervision (Watch-dog) reset circuit respectively.Structure according to such reset circuit, when making instantaneous mains voltage level generation abnormality by instantaneous power failure and short circuit accident etc., on the supply voltage of reset circuit, also produced abnormality thereupon, thereby before mains voltage level is recovered the normal moment, lost supervision (Watch-dog) function, therefore, even much less also exist mains voltage level to recover normally can not export the problem of effective reset signal.
Summary of the invention
In order to solve the problem in the above-mentioned reset circuit technology, the purpose of this invention is to provide a kind of automatic reset circuit, under the situation that applies supply voltage (Power-on) and under the situation of instantaneous mains voltage level generation abnormality, the microprocessor and the peripheral circuit that recover normally constantly need reset at supply voltage correctly are reset.
To achieve these goals, the invention is characterized in, comprising:
Supply voltage rising transition detection means, be used for from outside input supply voltage, make and shift the charging rate of the capacitor that is constantly charged in the rising of supply voltage ((Time Constant) is enough big, thereby exports the condenser voltage less than supply voltage;
The active homing benchmark is pick-up unit constantly, is used for from outside input supply voltage, imports the output of above-mentioned supply voltage rising transition detection means, recovers the normal rising transfer signal of constantly exporting at supply voltage; And
The reset pulse output unit is used for from outside input supply voltage, imports the rising transfer signal of being exported by above-mentioned active homing benchmark moment pick-up unit, and the rising transfer moment of recovering the normal moment at supply voltage, reset pulse took place.
Description of drawings
Describe one embodiment of the present of invention in detail below with reference to Fig. 1 to Fig. 4.
Fig. 1 is the pie graph of automatic reset circuit involved in the present invention;
Fig. 2 is the timing diagram that the test section signal is shifted in this bright supply voltage rising that relates to;
Fig. 3 is the active homing benchmark that the present invention relates to timing diagram of test section signal constantly;
Fig. 4 is the timing diagram of the reset pulse efferent signal that the present invention relates to.
Embodiment
Each label that uses with reference to the accompanying drawings, " Vcc " is direct current volt power supply, " D " is diode, and " R1 " is the resistance of 15K ohm, and " R2 " is the resistance of 5.1K ohm, " R3 " is the resistance of 1M ohm, " C " is the electrolytic condenser of 47 microfarads, and " PC " is Light Coupled Device (Photo coupler), 4N35, " A " is the input terminal that pulse shape is set that is used for of integrated circuit 74LS123, and number of pins is 1; " B " is the input terminal that pulse shape is set that is used for of integrated circuit 74LS123, and number of pins is 2; " CLR " is set input that is used for pulse shape of integrated circuit 74LS123, and number of pins is 3; " Cx " is capacitor connection terminal that pulsewidth is set that is used for of integrated circuit 74LS123, and number of pins is 14; " RxCx " is the splicing ear that pulsewidth is set that is used for of integrated circuit 74LS123, and is connected the terminal of the mid point that resistance is connected with capacitors in series, and number of pins is 15; " Q " is pulse output end of integrated circuit 74LS123, and number of pins is 4; " Rex " is the resistance that pulsewidth is set that is used for of integrated circuit 74LS123; " Cex " is the electrolytic condenser that pulsewidth is set that is used for of integrated circuit 74LS123.Have again, label " 11 " is that test section is shifted in the supply voltage rising, " 12 " are active homing benchmark test sections constantly, " 13 " are the reset pulse efferents, " 21 " are that supply voltage rises transfer constantly, electrolytic condenser C voltage when " 22 " are charging, " 23 " are that supply voltage descends transfer constantly, electrolytic condenser C voltage when " 24 " are discharge, " 31 " are that supply voltage recovers the normal moment, " 32 " are that the rising of Light Coupled Device (Photocoupler) output is shifted constantly, and " 41 " are that mains voltage level is recovered normally constantly, and " 42 " are reseting pulse widths.
Above-mentioned supply voltage rising is shifted test section 11 and is comprised: resistance R 1, from one end input outer power voltage (Vcc), make the charging rate (Time Constant) of the electrolytic condenser C that is charged in the rising transfer moment (21) of supply voltage enough big, output is less than the electrolytic condenser voltage (22) of supply voltage; Electrolytic condenser C, the one end is connected with the other end of above-mentioned resistance R 1, its other end ground connection; And diode D, be connected in parallel with above-mentioned resistance R 1, from outside input supply voltage, make in the decline of supply voltage and shift electrolytic condenser voltage (24) the acceleration discharge of being discharged on the moment (23).
Above-mentioned active homing benchmark test section (12) constantly comprising: Light Coupled Device PC, from outside input supply voltage, import above-mentioned supply voltage rising and shift the output of test section (11), the light emitting diode conducting that makes Light Coupled Device PC on the moment (21) is shifted in rising at supply voltage, in the normal moment (31 of recovery of mains voltage level, 41), export rising transfer signal (32) by the transistorized collector terminal of Light Coupled Device PC; Collector resistance R2, from one end input outer power voltage, the other end is connected on the transistorized collector output of Light Coupled Device PC; And base resistance R3, the one end is connected ground connection on the emitter of Light Coupled Device, and the other end is connected on the transistorized base terminal of Light Coupled Device.
Reset pulse efferent (13) is from outside input supply voltage, import the output of test section (12) constantly of above-mentioned active homing benchmark, recover the normal moment (31 in mains voltage level, 41) rising is shifted the moment (32) and is exported single reset pulse, and this single reset pulse has the pulsewidth (42) that is set by resistance R ex that is used for the pulsewidth setting and electrolytic condenser Cex.
Above-mentioned reset pulse efferent (13) comprising: be used for the resistance R ex that pulse width is set, and, one end input outer power voltage; Be used for the capacitor Cex that pulsewidth is set, the one end is connected on the other end of resistance R ex; And monostable harmonic oscillator (Monostable Multivibrater), the Cx terminal is connected on the other end of electrolytic condenser Cex, the other end that the RxCx terminal is connected resistance R ex is connected on the end of electrolytic condenser Cex, A terminal ground connection, make supply voltage from outside input B terminal, make the output of test section (12) constantly of above-mentioned active homing benchmark be imported into the CLR terminal, recover the normal moment (31 in mains voltage level, 41) rising is shifted the moment (32) and is exported single reset pulse, and this single reset pulse has the pulsewidth (42) that is set by resistance R ex that is used for the pulsewidth setting and electrolytic condenser Cex.
According to above-mentioned such structure of the present invention, can energising (Power-on) reset function and supervision (Watch0dog) reset function have been constructed simultaneously with single reset circuit, normal constantly the drawing of recovery at supply voltage resets benchmark constantly, export effective reset signal, just can correctly carry out power-on-reset thus and supervision resets, and have the reliability of the objective system of guaranteeing to reset.
Because the present invention can carry out various displacements, modification and change in the scope that does not break away from technical conceive of the present invention by those of ordinary skills, thereby is not limited in the foregoing description and accompanying drawing.
Claims (4)
1. automatic reset circuit comprises:
Supply voltage rising transition detection means (11), be used for from outside input supply voltage, make the charging rate of the capacitor (C) that charges in the supply voltage rising transfer moment (21) enough big, thereby output is less than the condenser voltage (22) of supply voltage;
The active homing benchmark is pick-up unit (12) constantly, has Light Coupled Device (PC), and this Light Coupled Device (PC) is used for from outside input supply voltage, recovers normal (31,41) constantly output rising transfer signal (32) at supply voltage; And
Reset pulse output unit (13), be used for from outside input supply voltage, the rising transfer signal (32) that input is exported by above-mentioned active homing benchmark moment pick-up unit (12) recovers the normal moment (31 at supply voltage, 41) rising is shifted constantly, and reset pulse upward takes place in (32)
It is characterized in that, above-mentioned Light Coupled Device is made of the light emitting diode and the bipolar transistor that shift (21) conducting constantly in the rising of supply voltage, when above-mentioned light emitting diode conducting, above-mentioned bipolar transistor recovers the normal moment (31 at supply voltage, 41) generate the rising transfer signal, output to collector terminal.
2. automatic reset circuit according to claim 1 is characterized in that, above-mentioned supply voltage rising transition detection means (11) comprising:
First resistance (R1), one end input outer power voltage make the charging rate of the electrolytic condenser (C) that charges in the supply voltage rising transfer moment (21) enough big, thereby output is less than the electrolytic condenser voltage (22) of supply voltage;
First electrolytic condenser (C), the one end links to each other its other end ground connection with the other end of above-mentioned first resistance (R1); And
Diode (D), itself and above-mentioned first resistance (R1) are connected in parallel, and from outside input supply voltage, make electrolytic condenser voltage (24) rapid discharge of being discharged on supply voltage descends the transfer moment (23).
3. automatic reset circuit according to claim 1 and 2 is characterized in that, above-mentioned active homing benchmark pick-up unit (12) constantly also comprises:
Collector resistance (R2), one end input outer power voltage, the other end links to each other with the transistorized collector output of above-mentioned Light Coupled Device; And
Base resistance (R3), the one end links to each other and ground connection with the transistorized emitter of above-mentioned Light Coupled Device, and the other end links to each other with the transistorized base terminal of above-mentioned Light Coupled Device.
4. according to the described automatic reset circuit of claim 3, it is characterized in that above-mentioned reset pulse output unit (13) comprising:
Be used to set second resistance (Rex) of pulsewidth, one end input outer power voltage;
Be used to set second capacitor (Cex) of pulsewidth, the one end links to each other with the other end of above-mentioned second resistance (Rex); And
Univibrator, the Cx terminal links to each other with the other end of above-mentioned second electrolytic condenser (Cex), the RxCx terminal links to each other with the other end of above-mentioned second resistance (Rex) and an end of above-mentioned second electrolytic condenser (Cex), A terminal ground connection, from the outside to B terminal input supply voltage, the output of above-mentioned Light Coupled Device (PC) input CLR terminal, recover the normal moment (31 in mains voltage level, 41) rising was shifted on the moment (32), export single reset pulse, this reset pulse has the pulsewidth (42) that is set by above-mentioned second resistance (Rex) that is used for the pulsewidth setting and above-mentioned second electrolytic condenser (Cex).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR15615/96 | 1996-05-11 | ||
| KR1019960015615A KR100201418B1 (en) | 1996-05-11 | 1996-05-11 | Automatic reset circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1186975A CN1186975A (en) | 1998-07-08 |
| CN1097764C true CN1097764C (en) | 2003-01-01 |
Family
ID=19458403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97104228A Expired - Fee Related CN1097764C (en) | 1996-05-11 | 1997-05-09 | Automatic reset circuit |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100201418B1 (en) |
| CN (1) | CN1097764C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100478886B1 (en) * | 1997-12-31 | 2005-08-02 | 서창전기통신 주식회사 | Automatic reset circuit |
| CN100530039C (en) * | 2006-06-02 | 2009-08-19 | 鸿富锦精密工业（深圳）有限公司 | Computer system reset device |
| KR100906603B1 (en) * | 2007-06-11 | 2009-07-09 | 주식회사 다산네트웍스 | Power providing apparatus with the ability of settling a moment power failure problem |
| CN102289273A (en) * | 2011-07-27 | 2011-12-21 | 苏州巴米特信息科技有限公司 | Automatic reset circuit |
| CN104539274B (en) * | 2014-12-31 | 2017-12-05 | 广东志高空调有限公司 | A kind of reset circuit and WiFi communication system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5297287A (en) * | 1992-03-02 | 1994-03-22 | S-Mos Systems, Incorporated | System and method for resetting a microprocessor system |
| US5321317A (en) * | 1991-08-30 | 1994-06-14 | Sgs-Thomson Microelectronics S.R.L. | Zero-consumption power-on reset circuit |
-
1996
- 1996-05-11 KR KR1019960015615A patent/KR100201418B1/en not_active IP Right Cessation
-
1997
- 1997-05-09 CN CN97104228A patent/CN1097764C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5321317A (en) * | 1991-08-30 | 1994-06-14 | Sgs-Thomson Microelectronics S.R.L. | Zero-consumption power-on reset circuit |
| US5297287A (en) * | 1992-03-02 | 1994-03-22 | S-Mos Systems, Incorporated | System and method for resetting a microprocessor system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1186975A (en) | 1998-07-08 |
| KR100201418B1 (en) | 1999-06-15 |
| KR970078000A (en) | 1997-12-12 |
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Granted publication date: 20030101 Termination date: 20150509 |
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| EXPY | Termination of patent right or utility model |