CN207490890U - A kind of reset circuit - Google Patents
A kind of reset circuit Download PDFInfo
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- CN207490890U CN207490890U CN201721539188.2U CN201721539188U CN207490890U CN 207490890 U CN207490890 U CN 207490890U CN 201721539188 U CN201721539188 U CN 201721539188U CN 207490890 U CN207490890 U CN 207490890U
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- output terminal
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- reset circuit
- power supply
- reset
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Abstract
The utility model discloses a kind of reset circuits, including the first power supply, second source, electric voltage observation circuit, first electrification reset circuit, second electrification reset circuit and reset signal output terminal, electric voltage observation circuit is for the voltage of the first power supply of monitoring and output reset signal, the output terminal of first power supply respectively with the input terminal of electric voltage observation circuit, the input terminal connection of first electrification reset circuit, the output terminal of second source is connect with the input terminal of the second electrification reset circuit, the output terminal of electric voltage observation circuit, the output terminal of first electrification reset circuit, the output terminal of second electrification reset circuit is connect with reset signal output terminal；The reset circuit of the utility model provides three electric voltage observation circuit, the first electrification reset circuit, the second electrification reset circuit reset signal output circuits, so that reset circuit is suitable for the hardware system for having timing requirements.
Description
Technical field
The utility model is related to reset field, especially a kind of reset circuit.
Background technology
Very high to the reliability requirement of hardware system in Modern Industry Products, in being normally applied, main control chip has multichannel
Supply voltage, and have timing requirements, i.e., the opening sequence of different electrical power voltage is different, and existing reset circuit is generally manual
It resets, it is difficult to meet the requirement of the hardware system with timing requirements.
Utility model content
In order to solve the above-mentioned technical problem, the purpose of this utility model is to provide a kind of reset circuit, suitable for there is sequential
It is required that hardware system.
Technical solution is used by the utility model：A kind of reset circuit, including the first power supply, second source, voltage
Observation circuit, the first electrification reset circuit, the second electrification reset circuit and reset signal output terminal, the electric voltage observation circuit are used
It is defeated with electric voltage observation circuit respectively in the voltage and output reset signal, the output terminal of first power supply for monitoring the first power supply
Enter the input terminal connection at end, the first electrification reset circuit, the output terminal of the second source is defeated with the second electrification reset circuit
Enter end connection, the output terminal of the electric voltage observation circuit, the output terminal of the first electrification reset circuit, second electrification reset circuit
Output terminal is connect with reset signal output terminal.
Further, first electrification reset circuit includes first resistor and the first capacitance；First power supply it is defeated
One end of outlet and first resistor connects, the other end of the first resistor and one end of the first capacitance, reset signal output terminal
Connection, the other end ground connection of first capacitance.
Further, first electrification reset circuit further includes second resistance, the other end of the first resistor and
One end connection of two resistance, the other end ground connection of the second resistance.
Further, second electrification reset circuit includes the second capacitance, 3rd resistor and the first NPN triode, institute
The output terminal for stating second source is connect with one end of the second capacitance, the other end of second capacitance and one end of 3rd resistor,
The base stage connection of first NPN triode, the other end ground connection of the 3rd resistor, the emitter of first NPN triode connect
Ground, the collector of first NPN triode are connect with reset signal output terminal.
Further, the reset circuit further includes filter circuit, and the output terminal of first power supply passes through filter circuit
It is connect with the input terminal of electric voltage observation circuit.
Further, the electric voltage observation circuit includes SGM809 voltage monitoring chips, the output terminal of first power supply
It is connect with the power input of SGM809 voltage monitoring chips, the output terminal and reset signal of the SGM809 voltage monitorings chip
Output terminal connects, the ground terminal ground connection of the SGM809 voltage monitorings chip.
Further, the filter circuit includes the 4th resistance and third capacitance, the output terminal of first power supply and the
One end connection of four resistance, the other end of the 4th resistance and the power input of SGM809 voltage monitoring chips, third electricity
One end connection of appearance, the other end ground connection of the third capacitance.
The beneficial effects of the utility model are：
A kind of reset circuit of the utility model, including being replied by cable on the first power supply, second source, electric voltage observation circuit, first
Position circuit, the second electrification reset circuit and reset signal output terminal, electric voltage observation circuit for monitor the voltage of the first power supply and
Export reset signal, the output terminal of the first power supply respectively with the input terminal of electric voltage observation circuit, the first electrification reset circuit it is defeated
Entering end connection, the output terminal of second source is connect with the input terminal of the second electrification reset circuit, the output terminal of electric voltage observation circuit,
The output terminal of first electrification reset circuit, the second electrification reset circuit output terminal connect with reset signal output terminal；This practicality
Novel reset circuit provides electric voltage observation circuit, the first electrification reset circuit, the second electrification reset circuit three and resets letter
Number output circuit, so that reset circuit is suitable for the hardware system for having timing requirements.
Description of the drawings
Specific embodiment of the present utility model is described further below in conjunction with the accompanying drawings：
Fig. 1 is an a kind of specific embodiment structure diagram of reset circuit of the utility model；
Fig. 2 is an a kind of specific embodiment circuit diagram of reset circuit of the utility model.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the application can phase
Mutually combination.
A kind of reset circuit, with reference to figure 1, Fig. 1 is an a kind of specific embodiment structural frames of reset circuit of the utility model
Figure, reset circuit include the first power supply, second source, electric voltage observation circuit, the first electrification reset circuit, the second electrification reset electricity
Road and reset signal output terminal, electric voltage observation circuit is for the voltage of the first power supply of monitoring and output reset signal, the first power supply
Input terminal of the output terminal respectively with the input terminal of electric voltage observation circuit, the first electrification reset circuit connect, second source it is defeated
Outlet is connect with the input terminal of the second electrification reset circuit, the output terminal of electric voltage observation circuit, the first electrification reset circuit it is defeated
Outlet, the second electrification reset circuit output terminal connect with reset signal output terminal.The reset circuit of the utility model provides
Three electric voltage observation circuit, the first electrification reset circuit, the second electrification reset circuit reset signal output circuits, so as to reset electricity
Road is suitable for having the hardware systems of timing requirements, and in the utility model, the first power supply and second source are sequential in multiple power supplies
Two different power supplys, specifically, second source are the power supply started the latest in multiple power supplys.
As being further improved for technical solution, reset circuit further includes filter circuit, and the output terminal of the first power supply passes through
The input terminal of filter circuit and electric voltage observation circuit connects.Further, it is the utility model one kind with reference to figure 1 and Fig. 2, Fig. 2
One specific embodiment circuit diagram of reset circuit, electric voltage observation circuit 3 include SGM809 voltage monitoring chip U1, filtered electrical
Road includes the 4th resistance R4 and third capacitance C3, and in the present embodiment, the voltage of the first power supply is 3.3V, and the first power supply 3V3's is defeated
Outlet is connect with one end of the 4th resistance R4, the other end of the 4th resistance R4 and the power input of SGM809 voltage monitoring chips
One end connection of VCC, third capacitance C3, the other end ground connection of third capacitance C3；The output terminal RST of SGM809 voltage monitoring chips
It is connect with reset signal output terminal nRST, the ground terminal GND ground connection of SGM809 voltage monitoring chips.
In the present embodiment, when SGM809 voltage monitoring chips U1 monitors that supply voltage is less than 2.93V, generation one is low
The reset signal of level resets system, the voltage in the 4th resistance R4 and third capacitance C3 composition RC circuit filtering circuits
Disturbance avoids occurring accidentally resetting.
As being further improved for technical solution, with reference to figure 1 and Fig. 2, the first electrification reset circuit 1 includes first resistor R1
With the first capacitance C1；In the present embodiment, the voltage of the first power supply is 3.3V, output terminal and the first resistor R1 of the first power supply 3V3
One end connection, one end of the other end of first resistor R1 and the first capacitance C1, reset signal output terminal nRST connect, and first is electric
Hold the other end ground connection of C1.When system just powers on, first resistor R1 and the first capacitance C1 form the upper of RC loop-delays 3.3V
The time is risen, is equivalent to when powering on and produces a reset signal；First electrification reset circuit 1 further includes second resistance R2, the
The other end of one resistance R1 is connect with one end of second resistance R2, the other end ground connection of second resistance R2.The work of second resistance R2
With being quickly the charge of the first capacitance C1 to be discharged, while first resistor R1, second resistance R2 and the first capacitance in power down
The circuit of C1 compositions is resistant to external disturbance, filters out the peak voltage in the first electrification reset circuit 1, ensures circuit stability, reliable.
As being further improved for technical solution, with reference to figure 1 and Fig. 2, the second electrification reset circuit 2 includes the second capacitance
C2,3rd resistor R3 and the first NPN triode Q1, in the present embodiment, second source is the power supply in electrifying timing sequence the latest, i.e., most
The power supply that evening starts, specifically, the voltage of second source is 1.2V；The one of the output terminal of second source 1V2 and the second capacitance C2
End connection, the other end of the second capacitance C2 are connect with the base stage of one end of 3rd resistor R3, the first NPN triode Q1, third electricity
The other end ground connection of R3, the emitter ground connection of the first NPN triode Q1 are hindered, the collector of the first NPN triode Q1 is believed with resetting
Number output terminal nRST connections.
In the present embodiment, with reference to figure 2, the second electrification reset circuit 2 is a voltage switch, is not had in second source 1V2
Before startup, the first NPN triode Q1 is closed, and when second source 1V2 is powered on, the second capacitance C2 charges, tri- poles of the first NPN
The base stage of pipe Q1 is 1.2V, and the conducting of the first NPN triode Q1 generates a reset signal, as second source 1V2 is slowly steady
Fixed, the voltage of the first NPN triode Q1 base stage slowly drops to 0V by 1.2V, finally, the shutdown of the first NPN triode Q1.This
The effect of circuit is that that get up the latest in system power source voltage generates a reset signal when powering on all the way to system, i.e., all
After power supply voltage start, system is resetted, it is ensured that system is not because electrifying timing sequence problem generates operation irregularity.
The utility model is by setting electric voltage observation circuit, the first electrification reset circuit, the second electrification reset circuit three
Reset signal output circuit provides a system to reliable reset signal, and with external antijamming capability, avoids because of external disturbance
Cause system reboot.
It is that the preferable of the utility model is implemented to be illustrated, but the invention is not limited to the reality above
Example is applied, those skilled in the art can also make various equivalent variations without departing from the spirit of the present invention
Or replace, these equivalent deformations or replacement are all contained in the application claim limited range.
Claims (7)
1. a kind of reset circuit, which is characterized in that including the first power supply, second source, electric voltage observation circuit, the first electrification reset
Circuit, the second electrification reset circuit and reset signal output terminal, the electric voltage observation circuit are used to monitor the voltage of the first power supply
With output reset signal, the output terminal of first power supply respectively with the input terminal of electric voltage observation circuit, the first electrification reset electricity
The input terminal connection on road, the output terminal of the second source are connect with the input terminal of the second electrification reset circuit, the voltage prison
The output terminal of slowdown monitoring circuit, the output terminal of the first electrification reset circuit, the output terminal of the second electrification reset circuit and reset signal are defeated
Outlet connects.
2. reset circuit according to claim 1, which is characterized in that first electrification reset circuit includes first resistor
With the first capacitance；One end of the output terminal of first power supply and first resistor connects, the other end of the first resistor and the
One end of one capacitance, the connection of reset signal output terminal, the other end ground connection of first capacitance.
3. reset circuit according to claim 2, which is characterized in that first electrification reset circuit further includes the second electricity
Resistance, the other end of the first resistor and one end of second resistance connect, the other end ground connection of the second resistance.
4. reset circuit according to claim 1, which is characterized in that second electrification reset circuit includes the second electricity
Appearance, 3rd resistor and the first NPN triode, the output terminal of the second source are connect with one end of the second capacitance, and described second
The other end of capacitance and one end of 3rd resistor, the base stage of the first NPN triode connect, another termination of the 3rd resistor
Ground, the emitter ground connection of first NPN triode, collector and the reset signal output terminal of first NPN triode connect
It connects.
5. reset circuit according to any one of claims 1 to 4, which is characterized in that the reset circuit further includes filtering
Circuit, the output terminal of first power supply are connected by the input terminal of filter circuit and electric voltage observation circuit.
6. reset circuit according to claim 5, which is characterized in that the electric voltage observation circuit is supervised including SGM809 voltages
Chip is surveyed, the output terminal of first power supply is connect with the power input of SGM809 voltage monitoring chips, the SGM809 electricity
The output terminal of pressure monitoring chip is connect with reset signal output terminal, the ground terminal ground connection of the SGM809 voltage monitorings chip.
7. reset circuit according to claim 6, which is characterized in that the filter circuit includes the 4th resistance and third electricity
Hold, the output terminal of first power supply is connect with one end of the 4th resistance, the other end and the SGM809 voltages of the 4th resistance
Monitor one end connection of the power input, third capacitance of chip, the other end ground connection of the third capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721539188.2U CN207490890U (en) | 2017-11-17 | 2017-11-17 | A kind of reset circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721539188.2U CN207490890U (en) | 2017-11-17 | 2017-11-17 | A kind of reset circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207490890U true CN207490890U (en) | 2018-06-12 |
Family
ID=62473909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721539188.2U Active CN207490890U (en) | 2017-11-17 | 2017-11-17 | A kind of reset circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207490890U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110543127A (en) * | 2019-09-20 | 2019-12-06 | 上海市共进通信技术有限公司 | System for realizing intelligent adjustment of time sequence of multiple power supplies |
| CN115357108A (en) * | 2022-06-30 | 2022-11-18 | 广州创龙电子科技有限公司 | AM335x discrete power supply power-on and power-off time sequence control circuit and method |
-
2017
- 2017-11-17 CN CN201721539188.2U patent/CN207490890U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110543127A (en) * | 2019-09-20 | 2019-12-06 | 上海市共进通信技术有限公司 | System for realizing intelligent adjustment of time sequence of multiple power supplies |
| CN115357108A (en) * | 2022-06-30 | 2022-11-18 | 广州创龙电子科技有限公司 | AM335x discrete power supply power-on and power-off time sequence control circuit and method |
| CN115357108B (en) * | 2022-06-30 | 2023-04-11 | 广州创龙电子科技有限公司 | AM335x discrete power supply power-on and power-off time sequence control circuit and method |
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