CN201965531U - Reset circuit - Google Patents
Reset circuit Download PDFInfo
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- CN201965531U CN201965531U CN2010206949559U CN201020694955U CN201965531U CN 201965531 U CN201965531 U CN 201965531U CN 2010206949559 U CN2010206949559 U CN 2010206949559U CN 201020694955 U CN201020694955 U CN 201020694955U CN 201965531 U CN201965531 U CN 201965531U
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Abstract
The utility model relates to a reset circuit, which comprises a triode, a diode, a voltage stabilizing diode, a time delay capacitor, a voltage dividing resistor and a discharging resistor. The threshold voltage of the triode forms a voltage comparison circuit. The diode, the voltage stabilizing diode and the time delay capacitor are added into the voltage comparison circuit. The anodes of the diode and the voltage stabilizing diode are abutted and are connected to a power supply through the voltage dividing resistor, and the cathodes of the diode and the voltage stabilizing diode are grounded. The collector of the triode is connected with the reset pin of a single-chip microcomputer and is grounded through the discharging resistor, the time delay capacitor is parallel-connected with the two ends of the discharging resistor, the emitter of the triode is directly connected with the power supply and the base of the triode is connected with the cathode of the diode. When the power supply of a digital circuit system is unstable and is interfered, the reset circuit can enable the system to be electrified and reset reliably and the stability of the system is ensured.
Description
Technical field
The present invention relates to the technical field of reset circuit, is a kind of in digital circuitry power supply shakiness specifically, when being interfered, makes reliably electrification reset of system, thus the reset circuit of the stability of the system of assurance.
Background technology
Resetting is the initialization operation of single-chip microcomputer.Single-chip microcomputer is started shipment when operation, all needs to reset earlier, and its effect is to make that miscellaneous part is in a definite original state in CPU and the system, and starts working from this state, thereby resetting is a very important mode of operation.
At present, the reset circuit in the digital circuit generally is to adopt basic RC integrating circuit or RC differentiating circuit.Reset signal is provided when system powers on, after system power supply is stable, cancels reset signal.Do not reset if system also finishes, the fluctuation of power supply occurs, electric capacity is discharge fully, and charging will can not reset by generation systems again, occur to crash, and phenomenon such as disorderly reset.If regulate the value of RC, change the delay time of reset signal, can cause the decline of driving force again.If power supply slowly descends, the reset circuit of this moment just can not reset immediately since electric capacity discharge is incomplete, can cause reset untimely.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of in digital circuitry power supply shakiness, when being interfered, makes reliably electrification reset of system, thus the reset circuit of the stability of the system of assurance.
The technical scheme that the present invention takes for the technical matters that exists in the solution known technology is:
Reset circuit of the present invention comprises: a triode, a diode, a voltage stabilizing diode, delay capacitor, divider resistance and a discharge resistance; Utilize the threshold voltage of triode to constitute voltage comparator circuit, in voltage comparator circuit, increase a diode, a zener diode and a delay capacitor; Diode and voltage stabilizing diode positive pole are docked, be connected to power supply by divider resistance, minus earth; The collector of triode connects the single-chip microcomputer reset pin, and by discharge resistance ground connection, delay capacitor is parallel to the two ends of this discharge resistance, and the emitter of triode directly connects power supply, and the base stage of triode connects the negative pole of diode simultaneously.
Advantage and good effect that the present invention has are:
In the reset circuit of the present invention, power supply is equivalent to and ground opens circuit when supply voltage moment descends, and electric capacity discharges rapidly by diode, so that when powering on once more, produces reliable reset level.Triode constitutes voltage comparator circuit, and in the time of can solving supply voltage and slowly descend, when the threshold voltage less than triode, triode ends, and produces reset level.Voltage stabilizing diode can make the saltus step threshold voltage not influenced by power supply.The amplification of triode also can improve the load characteristic of circuit in addition.Thereby can solve the power supply burr and cause system's instability, and the slow decline of power supply also can reliable reset, and a period of time of behind system stability, can also delaying time cancel reset signal again, in case power switch or attaching plug branch-close the shake that causes in the process and influence and reset.In digital circuitry power supply shakiness, when being interfered, make reliably electrification reset of system, guarantee the stability of system.Cost is lower with the chip that resets of specialty, and entire circuit institute stage space is less.
Description of drawings
Fig. 1 is the synoptic diagram of reset circuit of the present utility model;
Fig. 2 is the input-output characteristic curve figure of reset circuit of the present utility model.
Among Fig. 1, Z1 is a voltage stabilizing diode, and D1 is a discharge diode, and R1 and R2 are pull-up resistors, and Ch is a delay capacitor, and SM is the hand-reset button, and Q1 is a triode.
Fig. 2 is followed successively by from top to bottom, VCC power supply curve, the RST of basic RC reset circuit and/the RST curve, the RST of novel resetting circuit and/the RST curve.
Embodiment
It is following that the present invention will be described in detail with reference to drawings and Examples.
Fig. 1 is the synoptic diagram of reset circuit of the present utility model; Fig. 2 is the input-output characteristic curve figure of reset circuit of the present utility model.
Reset circuit of the present invention comprises: a triode, a diode, a voltage stabilizing diode, delay capacitor, divider resistance and a discharge resistance; Utilize the threshold voltage of triode to constitute voltage comparator circuit, in voltage comparator circuit, increase a diode, a zener diode and a delay capacitor; Diode and voltage stabilizing diode positive pole are docked, be connected to power supply by divider resistance, minus earth; The collector of triode connects the single-chip microcomputer reset pin, and by discharge resistance ground connection, delay capacitor is parallel to the two ends of this discharge resistance, and the emitter of triode directly connects power supply, and the base stage of triode connects the negative pole of diode simultaneously.
In the reset circuit of the present invention, power supply is equivalent to and ground opens circuit when supply voltage moment descends, and electric capacity discharges rapidly by diode, so that when powering on once more, produces reliable reset level.Triode constitutes voltage comparator circuit, and in the time of can solving supply voltage and slowly descend, when the threshold voltage less than triode, triode ends, and produces reset level.Voltage stabilizing diode can make the saltus step threshold voltage not influenced by power supply.The amplification of triode also can improve the load characteristic of circuit in addition.Thereby can solve the power supply burr and cause system's instability, and the slow decline of power supply also can reliable reset, and a period of time of behind system stability, can also delaying time cancel reset signal again, in case power switch or attaching plug branch-close the shake that causes in the process and influence and reset.
As shown in Figure 1 and Figure 2, reset circuit of the present invention is the low level reset circuit.VCC is the supply voltage of singlechip chip, works as energized, and VCC begins to rise from 0V, and before the voltage stabilizing value that rises to voltage stabilizing diode pipe Z1, Z1 is in cut-off state.During threshold voltage Q1(NPN)＜0.7V, be in cut-off state equally.RESET is low level effectively (resetting).Supply voltage continue to rise, as VCC〉during Vz1+0.7V (the voltage stabilizing value of voltage stabilizing diode), Z1 is reversed puncture, the Q1 conducting, RESET is a high level, and system reset finishes, and power supply is stable.
Using at some also will be to VCC power supply monitor closely, in case VCC drops into a certain threshold value, single-chip microcomputer is resetted, in order to avoid system is out of control, as the power supply instability, promptly during VCC＜Z1+0.7V, triode ends, capacitor C 1 is by discharge diode D1 discharge, and moment RESET is a low level, and single-chip microcomputer resets.When having solved supply voltage and slowly descending, system can reliable reset.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention with preferred embodiment openly as above, yet, be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, certainly can utilize the technology contents of announcement to make a little change or modification, become the equivalent embodiment of equivalent variations, be the content that does not break away from technical solution of the present invention in every case, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all belong in the scope of technical solution of the present invention.
Claims (1)
1. a reset circuit is characterized in that: comprising: a triode, a diode, a voltage stabilizing diode, delay capacitor, divider resistance and a discharge resistance; Utilize the threshold voltage of triode to constitute voltage comparator circuit, in voltage comparator circuit, increase a diode, a zener diode and a delay capacitor; Diode and voltage stabilizing diode positive pole are docked, be connected to power supply by divider resistance, minus earth; The collector of triode connects the single-chip microcomputer reset pin, and by discharge resistance ground connection, delay capacitor is parallel to the two ends of this discharge resistance, and the emitter of triode directly connects power supply, and the base stage of triode connects the negative pole of diode simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206949559U CN201965531U (en) | 2010-12-31 | 2010-12-31 | Reset circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206949559U CN201965531U (en) | 2010-12-31 | 2010-12-31 | Reset circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201965531U true CN201965531U (en) | 2011-09-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206949559U Expired - Fee Related CN201965531U (en) | 2010-12-31 | 2010-12-31 | Reset circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN201965531U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746681A (en) * | 2013-12-24 | 2014-04-23 | 北京时代民芯科技有限公司 | Power-on/power-down output tri-state control circuit for CMOS device power supply |
| CN103873046A (en) * | 2014-03-24 | 2014-06-18 | 福建师范大学 | Lower level reset circuit capable of rapidly responding to voltage collapse of power source |
| CN104868892A (en) * | 2015-05-29 | 2015-08-26 | 珠海市杰理科技有限公司 | Integrated circuit and reset circuit thereof |
| CN107196632A (en) * | 2017-05-07 | 2017-09-22 | 长沙方星腾电子科技有限公司 | A kind of electrification reset circuit |
| CN107315465A (en) * | 2017-06-30 | 2017-11-03 | 浙江吉利汽车研究院有限公司 | A kind of single-chip microprocessor MCU time-delay reset circuit and control method |
| CN107846208A (en) * | 2017-09-30 | 2018-03-27 | 深圳市艾特智能科技有限公司 | Stabilization reset circuit |
| CN109164902A (en) * | 2018-08-11 | 2019-01-08 | 芜湖市新海域智能科技有限公司 | A kind of reset circuit for computer motherboard |
| CN112486060A (en) * | 2020-11-20 | 2021-03-12 | 深圳市沃特沃德股份有限公司 | Reset circuit, circuit board and electronic product of singlechip |
-
2010
- 2010-12-31 CN CN2010206949559U patent/CN201965531U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746681A (en) * | 2013-12-24 | 2014-04-23 | 北京时代民芯科技有限公司 | Power-on/power-down output tri-state control circuit for CMOS device power supply |
| CN103746681B (en) * | 2013-12-24 | 2017-06-30 | 北京时代民芯科技有限公司 | A kind of upper and lower electricity output tri-state control circuit of cmos device power supply |
| CN103873046A (en) * | 2014-03-24 | 2014-06-18 | 福建师范大学 | Lower level reset circuit capable of rapidly responding to voltage collapse of power source |
| CN104868892A (en) * | 2015-05-29 | 2015-08-26 | 珠海市杰理科技有限公司 | Integrated circuit and reset circuit thereof |
| CN104868892B (en) * | 2015-05-29 | 2018-08-07 | 珠海市杰理科技股份有限公司 | Integrated circuit and its reset circuit |
| CN107196632A (en) * | 2017-05-07 | 2017-09-22 | 长沙方星腾电子科技有限公司 | A kind of electrification reset circuit |
| CN107315465A (en) * | 2017-06-30 | 2017-11-03 | 浙江吉利汽车研究院有限公司 | A kind of single-chip microprocessor MCU time-delay reset circuit and control method |
| CN107846208A (en) * | 2017-09-30 | 2018-03-27 | 深圳市艾特智能科技有限公司 | Stabilization reset circuit |
| CN109164902A (en) * | 2018-08-11 | 2019-01-08 | 芜湖市新海域智能科技有限公司 | A kind of reset circuit for computer motherboard |
| CN112486060A (en) * | 2020-11-20 | 2021-03-12 | 深圳市沃特沃德股份有限公司 | Reset circuit, circuit board and electronic product of singlechip |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170106 Address after: 100015 room, building 1, Jiuxianqiao East Road, Beijing, No. 8, C615 Patentee after: Beijing Qichuang Zhuoyue Science & Technology Co., Ltd. Address before: Crowne Plaza No. 55 road 300308 Tianjin District of Tanggu City Airport Logistics Processing Zone center, building 3, 703 Patentee before: Tianjin Primemobi Technology Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110907 Termination date: 20161231 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |