CN203773466U - Novel low-level reset circuit capable of quickly responding to power voltage sag - Google Patents
Novel low-level reset circuit capable of quickly responding to power voltage sag Download PDFInfo
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- CN203773466U CN203773466U CN201420133962.XU CN201420133962U CN203773466U CN 203773466 U CN203773466 U CN 203773466U CN 201420133962 U CN201420133962 U CN 201420133962U CN 203773466 U CN203773466 U CN 203773466U
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Abstract
The utility model discloses a novel low-level reset circuit capable of quickly responding to power voltage sag. The novel low-level reset circuit is used for performing power-on reset on a CPU (central processing unit) and resetting during power voltage sag. The reset circuit comprises a PNP triode, a two-terminal voltage stabilizing tube, a diode, a capacitor, a load resistor and a biasing resistor. Proper reset time is obtained by the aid of charging of the capacitor, and rapid discharge of the capacitor during voltage sag is realized by the aid of the diode so as to realize resetting during voltage sag. The reset circuit is simple, reliable in function and high in cost performance, and has broad application prospect.
Description
Technical field
The utility model relates to the applied technical field of CPU, relates in particular to a kind of reset circuit that can supply voltage be subsided and be responded fast.
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 instability of operating voltage, if do not have reset circuit to reset to CPU,, when power supply is when 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 a 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 velocity is slow, and cost performance is poor.Special-purpose reset IC is high cost.
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 and possess the function of system power-on reset simultaneously.
Summary of the invention
The purpose of this utility model is to provide a kind of can tackle the reset circuit that supply voltage subsides fast.
The technical solution of the utility model is, the low-level reset circuit of the quick power source-responsive voltage collapse of a kind of novel energy, for CPU being carried out to electrification reset and resetting, comprise positive-negative-positive triode, two end stabilivolts, diode, electric capacity, biasing resistor, pull-up resistor totally 6 devices when supply voltage subsides; Wherein, power supply is realized and being discharged and recharged and collaborative two end stabilivolts provide base current to positive-negative-positive triode electric capacity by diode in parallel and biasing resistor; Positive-negative-positive triode in a period of time after capacitor charging starts by, and by its collector to the reset pin output low level reset signal of CPU.
Concrete connected mode and the principle of work of each device are described below:
Connected mode is: after the emitter of one end of electric capacity and positive-negative-positive triode joins, be connected to power supply, the other end of electric capacity connects the negative electrode and the anode that is connected two end stabilivolts of diode, the plus earth of diode, biasing resistor is connected across the two ends of diode, the negative electrode of two end stabilivolts connects the base stage of positive-negative-positive triode, the collector of positive-negative-positive triode is through pull-up resistor ground connection, and the collector of positive-negative-positive triode connects the reset pin of CPU as output.
Principle of work 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 (being applied to the voltage that PNP type triode emitter junction is connected on two end stabilivolts) at electric capacity two ends hour, positive-negative-positive triode can not get enough large emitter junction bias voltage, positive-negative-positive triode is in cut-off state, and the collector output low level of positive-negative-positive triode, provides low level reset signal to the reset pin of described CPU.When capacitor charging is enough large to the voltage difference at electric capacity two ends, positive-negative-positive triode obtains enough large emitter junction bias voltage, positive-negative-positive triode enters conducting or saturation conduction state, the collector output high level of positive-negative-positive triode, the reset pin that is CPU obtains high 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 stage of positive-negative-positive triode and the electric current of two end stabilivolts, charging finishes.
When supply voltage subsides, when it drops to predetermined value, electric capacity is through biasing resistor in parallel and diode rapid discharge, the voltage difference at electric capacity two ends is diminished rapidly, and then positive-negative-positive triode can not get enough large emitter junction bias voltage, make positive-negative-positive triode become cut-off state from conducting or saturation conduction, the collector output low level of positive-negative-positive triode, provides low level reset signal to the reset pin of described CPU.
Implement the following beneficial effect that has of technical solutions of the utility model: overcome the deficiencies in the prior art, adopt single triode and several discrete components seldom to form reset circuit, both can when CPU start powers on, reset, can when 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.
Accompanying drawing explanation
Figure l is the structural drawing of the low-level reset circuit of the quick power source-responsive voltage collapse of a kind of novel energy of the present utility model.
Embodiment
In order to make the technical solution of the utility model clearer, below in conjunction with accompanying drawing, further describe.
In Fig. 1, VCC is power supply, and GND is ground; C1 is electric capacity; R1 is biasing resistor; R2 is pull-up resistor; Q1 is positive-negative-positive triode; DW1 is two end stabilivolts; D1 is diode; RESET is the reset pin of CPU.
A low-level reset circuit for the quick power source-responsive voltage collapse of novel energy, comprises positive-negative-positive triode (Q1), two end stabilivolts (DW1), diode (D1), electric capacity (C1), biasing resistor (R1), pull-up resistor (R2) totally 6 devices.Connected mode is: after the emitter of one end of electric capacity (C1) and positive-negative-positive triode (Q1) joins, be connected to power supply (VCC), the other end of electric capacity (C1) connects the negative electrode and the anode that is connected two end stabilivolts (DW1) of diode (D1), the plus earth (GND) of diode (D1), biasing resistor (R1) is connected across the two ends of diode (D1), the negative electrode of two end stabilivolts (DW1) connects the base stage of positive-negative-positive triode (Q1), the collector of positive-negative-positive triode (Q1) is through pull-up resistor (R2) ground connection (GND), the collector of positive-negative-positive triode (Q1) connects the reset pin (RESET) of CPU as output.
Claims (1)
1. the low-level reset circuit of the quick power source-responsive voltage collapse of novel energy, it is characterized in that, this circuit by positive-negative-positive triode (Q1), two end stabilivolts (DW1), diode (D1), electric capacity (C1), biasing resistor (R1), pull-up resistor (R2) totally 6 devices form, connected mode is: after the emitter of one end of electric capacity (C1) and positive-negative-positive triode (Q1) joins, be connected to power supply (VCC), the other end of electric capacity (C1) connects the negative electrode and the anode that is connected two end stabilivolts (DW1) of diode (D1), the plus earth (GND) of diode (D1), biasing resistor (R1) is connected across the two ends of diode (D1), the negative electrode of two end stabilivolts (DW1) connects the base stage of positive-negative-positive triode (Q1), the collector of positive-negative-positive triode (Q1) is through pull-up resistor (R2) ground connection (GND), the collector of positive-negative-positive triode (Q1) connects the reset pin (RESET) of CPU as output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420133962.XU CN203773466U (en) | 2014-03-24 | 2014-03-24 | Novel low-level reset circuit capable of quickly responding to power voltage sag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420133962.XU CN203773466U (en) | 2014-03-24 | 2014-03-24 | Novel low-level reset circuit capable of quickly responding to power voltage sag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203773466U true CN203773466U (en) | 2014-08-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420133962.XU Expired - Fee Related CN203773466U (en) | 2014-03-24 | 2014-03-24 | Novel low-level reset circuit capable of quickly responding to power voltage sag |
Country Status (1)
| Country | Link |
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| CN (1) | CN203773466U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105811939A (en) * | 2016-03-11 | 2016-07-27 | 福建师范大学 | Quick response low level reset circuit for preventing supply voltage collapse and high-frequency interference |
-
2014
- 2014-03-24 CN CN201420133962.XU patent/CN203773466U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105811939A (en) * | 2016-03-11 | 2016-07-27 | 福建师范大学 | Quick response low level reset circuit for preventing supply voltage collapse and high-frequency interference |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 |