CN203775171U - Novel high-level reset circuit capable of quickly responding to supply voltage collapse - Google Patents
Novel high-level reset circuit capable of quickly responding to supply voltage collapse Download PDFInfo
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- CN203775171U CN203775171U CN201420133976.1U CN201420133976U CN203775171U CN 203775171 U CN203775171 U CN 203775171U CN 201420133976 U CN201420133976 U CN 201420133976U CN 203775171 U CN203775171 U CN 203775171U
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- reset
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- type triode
- npn type
- diode
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Abstract
The utility model discloses a novel high-level reset circuit capable of quickly responding to supply voltage collapse. The high-level reset circuit is used for performing power-on reset and supply-voltage-collapse reset on a CPU and is composed of a NPN-type triode, a two-end voltage-stabilizer tube, a diode, a capacitor, a load resistor, and a bias resistor. Appropriate reset time is obtained by means of the charging of the capacitor. Quick discharging of the capacitor is achieved by the diode when supply voltage is collapsed in order that supply-voltage-collapse reset is achieved. The high-level reset circuit is simple in circuit, reliable in functions, high in cost performance, and wide in 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 unsteadiness 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 speed 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 high 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 NPN type triode, two end voltage-stabiliser tubes, diode, electric capacity, biasing resistor, load resistance totally 6 devices when 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; NPN type triode in 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 of NPN type triode is exported high level, and the reset signal of high level is provided to the reset pin of described CPU.When 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.
When supply voltage subsides, when 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 of NPN type triode is exported high level, and the reset signal of high level is provided 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 structure chart of the high 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 load resistance; Q2 is NPN type triode; DW1 is two end voltage-stabiliser tubes; D1 is diode; RESET is the reset pin of CPU.
A high level reset circuit for the quick power source-responsive voltage collapse of novel energy, comprises 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. the high level reset circuit of the quick power source-responsive voltage collapse of novel energy, it is characterized in that, this circuit 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 form, 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 |
|---|---|---|---|
| CN201420133976.1U CN203775171U (en) | 2014-03-24 | 2014-03-24 | Novel high-level reset circuit capable of quickly responding to supply voltage collapse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420133976.1U CN203775171U (en) | 2014-03-24 | 2014-03-24 | Novel high-level reset circuit capable of quickly responding to supply voltage collapse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203775171U true CN203775171U (en) | 2014-08-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420133976.1U Expired - Fee Related CN203775171U (en) | 2014-03-24 | 2014-03-24 | Novel high-level reset circuit capable of quickly responding to supply voltage collapse |
Country Status (1)
| Country | Link |
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| CN (1) | CN203775171U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103888113A (en) * | 2014-03-24 | 2014-06-25 | 福建师范大学 | High-level reset circuit capable of rapidly responding to voltage collapse of power source |
| CN105811940A (en) * | 2016-03-11 | 2016-07-27 | 福建师范大学 | Quick-response high-level reset circuit with power supply voltage collapse resistance and high frequency interference resistance |
-
2014
- 2014-03-24 CN CN201420133976.1U patent/CN203775171U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103888113A (en) * | 2014-03-24 | 2014-06-25 | 福建师范大学 | High-level reset circuit capable of rapidly responding to voltage collapse of power source |
| CN105811940A (en) * | 2016-03-11 | 2016-07-27 | 福建师范大学 | Quick-response high-level reset circuit with power supply voltage collapse resistance and high frequency interference resistance |
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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 |
Granted publication date: 20140813 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |