CN103888113A - High-level reset circuit capable of rapidly responding to voltage collapse of power source - Google Patents
High-level reset circuit capable of rapidly responding to voltage collapse of power source Download PDFInfo
- Publication number
- CN103888113A CN103888113A CN201410110125.XA CN201410110125A CN103888113A CN 103888113 A CN103888113 A CN 103888113A CN 201410110125 A CN201410110125 A CN 201410110125A CN 103888113 A CN103888113 A CN 103888113A
- Authority
- CN
- China
- Prior art keywords
- voltage
- npn type
- power source
- type triode
- reset
- 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.)
- Pending
Links
Landscapes
- Electronic Switches (AREA)
Abstract
The invention discloses a high-level reset circuit capable of rapidly responding to a voltage collapse of a power source. The high-level reset circuit capable of rapidly responding to the voltage collapse of the power source is used for carrying out power-on resetting on a CPU and carrying out resetting when the voltage of the power source collapses, and comprises an NPN type audion, a two-end voltage-regulator tube, a diode, a capacitor, a loading resistor and a biasing resistor, a proper resetting time is obtained by using charging of the capacitor, and resetting when the voltage of the power source collapses is achieved by using rapid discharging of the capacitor through the diode when the voltage of the power source collapses. The high-level reset circuit capable of rapidly responding to the voltage collapse of the power source is simple, reliable in function and high in cost performance, and has broad application aspects.
Description
Technical field
The present invention relates to the applied technical field of CPU, relate in particular to a kind of can be to the supply voltage fast reset circuit of response that subsides.
Background technology
The more and more general use CPU of existing electronic product controls, and when CPU start powers on and occurs that supply voltage subsides, all needs to carry out reset operation, and the quality of cpu reset quality directly has influence on stability and the reliability of electronic product work.Due to the unsteadiness of operating voltage, if do not have reset circuit to reset to CPU,, when power supply is in the time that fluctuation status is worked, very easily cause CPU work deadlock or not normal.Reset is to show the reset pin of CPU within the scope of certain hour, to provide the reset level in contrast to normal operation level (high or low), to meet the requirement of cpu reset.
In prior art, conventional reset circuit has simple rc reset circuit, triode reset circuit, reset IC etc.Wherein, triode reset circuit be divided into again that charged detects and not charged detect two kinds, can realize with triode, also can be with two or more triodes realizations.Power supply detects and refers to that reset circuit can provide reset signal again according to the situation of subsiding of power supply under the condition of setting.Simple rc reset circuit, the not detection to power supply though structure is simple, but cannot provide reset signal after supply voltage subsides, and it is not very stable causing system works.Although the reset circuit containing a triode can prevent the reset repeatedly that the shake of power supply causes, seems helpless for subsiding of supply voltage, subsiding of voltage refers to that millisecond voltage to hundreds of millisecond duration is lower than normal job requirement.Device is many, cost is high for the two-tube reset circuit that existing charged detects, and reaction speed is slow, and cost performance is poor.Special high cost of reset IC.
Therefore, need a kind of simple and practical reset circuit, can play and detect the variation of power supply and after supply voltage subsides, provide rapidly reset signal the function that also simultaneously possesses system power-on reset.
Summary of the invention
The object of the present invention is to provide and a kind ofly can tackle fast the reset circuit that supply voltage subsides.
Technical scheme of the present invention is, a kind of can be to the supply voltage fast high level reset circuit of response that subsides, for CPU being carried out to electrification reset and resetting, comprise NPN type triode, two end voltage-stabiliser tubes, diode, electric capacity, biasing resistor, load resistance totally 6 devices in the time that supply voltage subsides; Wherein, power supply is realized and being discharged and recharged and collaborative two end voltage-stabiliser tubes provide base current to NPN type triode electric capacity by diode in parallel and biasing resistor; In NPN type triode a period of time after capacitor charging starts by, and by its collector electrode the reset pin output high level reset signal to CPU.
Concrete connected mode and the operation principle of each device are described below:
Connected mode is: after the emitter of one end of electric capacity and NPN type triode joins, be connected to ground, the other end of electric capacity connects the anode and the negative electrode that is connected two end voltage-stabiliser tubes of diode, the negative electrode of diode connects power supply, biasing resistor is connected across the two ends of diode, the base stage of the anodic bonding NPN type triode of two end voltage-stabiliser tubes, the collector electrode of NPN type triode connects power supply through load resistance, and the collector electrode of NPN type triode connects the reset pin of CPU as output.
Operation principle is: after start powers on, electric capacity starts charging by biasing resistor, charging increases the voltage difference at electric capacity two ends gradually, when the voltage difference at electric capacity two ends (being applied to the voltage on two end voltage-stabiliser tubes series connection NPN type triode emitter junctions) hour, NPN type triode can not get enough large emitter junction bias voltage, NPN type triode is in cut-off state, and the collector electrode output high level of NPN type triode, provides the reset signal of high level to the reset pin of described CPU.In the time that capacitor charging is enough large to the voltage difference at electric capacity two ends, NPN type triode obtains enough large emitter junction bias voltage, NPN type triode enters conducting or saturation conduction state, the collector electrode output low level of NPN type triode, the reset pin that is CPU obtains low level, and CPU exits electrification reset state.When the voltage difference that continues to charge to electric capacity two ends when electric capacity reaches certain value, when the electric current of the biasing resistor of flowing through and the leakage current sum that flows through diode equal to flow through the base current of two end voltage-stabiliser tubes and NPN type triode, charging finishes.
In the time that supply voltage subsides, in the time that it drops to predetermined value, electric capacity is through biasing resistor in parallel and diode repid discharge, the voltage difference at electric capacity two ends is diminished rapidly, and then NPN type triode can not get enough large emitter junction bias voltage, make NPN type triode become cut-off state from conducting or saturation conduction, the collector electrode output high level of NPN type triode, provides the reset signal of high level to the reset pin of described CPU.
Implement the following beneficial effect that has of technical solution of the present invention: overcome the deficiencies in the prior art, adopt single triode and little several discrete components to form reset circuit, both can in the time that CPU start powers on, reset, can in the time that supply voltage subsides, reset again.The reset circuit circuit providing is simple, reliable in function, and cost performance is high, has very wide application prospect.
Brief description of the drawings
Figure l be of the present invention a kind of can be to the supply voltage fast structure chart of the high level reset circuit of response that subsides.
Embodiment
In order to make technical scheme of the present invention clearer, further describe below in conjunction with accompanying drawing.
In Fig. 1, VCC is power supply, and GND is ground; C1 is electric capacity; R1 is biasing resistor; R2 is load resistance; Q2 is NPN type triode; DW1 is two end voltage-stabiliser tubes; D1 is diode; RESET is the reset pin of CPU.
Can, to the supply voltage fast high level reset circuit for response that subsides, comprise NPN type triode (Q2), two end voltage-stabiliser tubes (DW1), diode (D1), electric capacity (C1), biasing resistor (R1), load resistance (R2) totally 6 devices.Connected mode is: after the emitter of one end of electric capacity (C1) and NPN type triode (Q2) joins, be connected to (GND), the other end of electric capacity (C1) connects the anode and the negative electrode that is connected two end voltage-stabiliser tubes (DW1) of diode (D1), the negative electrode of diode (D1) connects power supply (VCCC), biasing resistor (R1) is connected across the two ends of diode (D1), the base stage of the anodic bonding NPN type triode (Q2) of two end voltage-stabiliser tubes (DW1), the collector electrode of NPN type triode (Q2) connects power supply (VCC) through load resistance (R2), the collector electrode of NPN type triode (Q2) connects the reset pin (RESET) of CPU as output.
Claims (1)
1. an energy is to the supply voltage high level reset circuit of response fast that subsides, it is characterized in that, this circuit is by NPN type triode (Q2), two end voltage-stabiliser tubes (DW1), diode (D1), electric capacity (C1), biasing resistor (R1), load resistance (R2) totally 6 devices formations, connected mode is: after the emitter of one end of electric capacity (C1) and NPN type triode (Q2) joins, be connected to (GND), the other end of electric capacity (C1) connects the anode and the negative electrode that is connected two end voltage-stabiliser tubes (DW1) of diode (D1), the negative electrode of diode (D1) connects power supply (VCCC), biasing resistor (R1) is connected across the two ends of diode (D1), the base stage of the anodic bonding NPN type triode (Q2) of two end voltage-stabiliser tubes (DW1), the collector electrode of NPN type triode (Q2) connects power supply (VCC) through load resistance (R2), the collector electrode of NPN type triode (Q2) connects the reset pin (RESET) of CPU as output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410110125.XA CN103888113A (en) | 2014-03-24 | 2014-03-24 | High-level reset circuit capable of rapidly responding to voltage collapse of power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410110125.XA CN103888113A (en) | 2014-03-24 | 2014-03-24 | High-level reset circuit capable of rapidly responding to voltage collapse of power source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103888113A true CN103888113A (en) | 2014-06-25 |
Family
ID=50956853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410110125.XA Pending CN103888113A (en) | 2014-03-24 | 2014-03-24 | High-level reset circuit capable of rapidly responding to voltage collapse of power source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103888113A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07250189A (en) * | 1994-03-11 | 1995-09-26 | Toshiba Corp | Voltage reset device and key telephone system using the same |
| CN2708377Y (en) * | 2004-07-06 | 2005-07-06 | 广东科龙电器股份有限公司 | Single-chip microcomputer reset circuit |
| CN2728102Y (en) * | 2004-08-20 | 2005-09-21 | 洪明君 | Delayed start circuit for power supply |
| CN200953596Y (en) * | 2006-10-18 | 2007-09-26 | 青岛海信电器股份有限公司 | Resetting circuit and television with said reetting circuit |
| CN201601465U (en) * | 2009-11-03 | 2010-10-06 | 常熟开关制造有限公司(原常熟开关厂） | Time delay reset circuit for electronic overload relay |
| CN203775171U (en) * | 2014-03-24 | 2014-08-13 | 福建师范大学 | Novel high-level reset circuit capable of quickly responding to supply voltage collapse |
-
2014
- 2014-03-24 CN CN201410110125.XA patent/CN103888113A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07250189A (en) * | 1994-03-11 | 1995-09-26 | Toshiba Corp | Voltage reset device and key telephone system using the same |
| CN2708377Y (en) * | 2004-07-06 | 2005-07-06 | 广东科龙电器股份有限公司 | Single-chip microcomputer reset circuit |
| CN2728102Y (en) * | 2004-08-20 | 2005-09-21 | 洪明君 | Delayed start circuit for power supply |
| CN200953596Y (en) * | 2006-10-18 | 2007-09-26 | 青岛海信电器股份有限公司 | Resetting circuit and television with said reetting circuit |
| CN201601465U (en) * | 2009-11-03 | 2010-10-06 | 常熟开关制造有限公司(原常熟开关厂） | Time delay reset circuit for electronic overload relay |
| CN203775171U (en) * | 2014-03-24 | 2014-08-13 | 福建师范大学 | Novel high-level reset circuit capable of quickly responding to supply voltage collapse |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104917376B (en) | DC/DC converter | |
| TWI489240B (en) | Constant on time controller | |
| CN203775171U (en) | Novel high-level reset circuit capable of quickly responding to supply voltage collapse | |
| CN103148953A (en) | Temperature detecting circuit based on thermistor | |
| CN205485898U (en) | Anti high frequency interference's mains voltage quick response low level reset circuit that sinks | |
| CN203775172U (en) | High level reset circuit capable of coping with power supply voltage collapse | |
| CN104917375B (en) | DC/DC converter | |
| CN103529723A (en) | Triggering jitter prevention time switch circuit with zero static power consumption | |
| CN203773466U (en) | Novel low-level reset circuit capable of quickly responding to power voltage sag | |
| CN203012568U (en) | Constant current source circuit for global position system (GPS) device | |
| CN103873046A (en) | Lower level reset circuit capable of rapidly responding to voltage collapse of power source | |
| CN103023314A (en) | Buck-boost switching power supply and controller thereof | |
| CN104010148A (en) | Power circuit and television | |
| CN103888113A (en) | High-level reset circuit capable of rapidly responding to voltage collapse of power source | |
| CN108955930B (en) | Temperature measuring circuit | |
| CN205485899U (en) | Anti high frequency interference's mains voltage quick response high level reset circuit that sinks | |
| CN204168263U (en) | A kind of low-level reset circuit can tackled supply voltage and subside | |
| CN203069291U (en) | Thermistor-based temperature detection circuit | |
| US20130154722A1 (en) | Voltage-stabilizing circuit | |
| CN103904630A (en) | Discharging circuit | |
| CN107484305B (en) | Switching device, switching control method and LED driving system suitable for switching device | |
| CN205490464U (en) | Delay circuit of repid discharge | |
| CN109507928A (en) | A kind of sequential control circuit of power supply application | |
| CN201788202U (en) | Electronic load circuit | |
| CN209001912U (en) | A kind of square wave generative circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140625 |