CN211509027U - Power-off reset circuit - Google Patents
Power-off reset circuit Download PDFInfo
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- CN211509027U CN211509027U CN202020090424.2U CN202020090424U CN211509027U CN 211509027 U CN211509027 U CN 211509027U CN 202020090424 U CN202020090424 U CN 202020090424U CN 211509027 U CN211509027 U CN 211509027U
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Abstract
The utility model discloses a power-off reset circuit, which comprises a direct current power supply, a first switch circuit, an energy storage element, a second switch circuit and a control element; the input end of the first switch circuit is electrically connected with the energy storage element and the output end of the direct-current power supply respectively, the control end of the first switch circuit is electrically connected with the output end of the direct-current power supply through a first voltage reduction element, and the output end of the first switch circuit is electrically connected with the control end of the second switch circuit. The technical scheme provided by the utility model, following advantage has: the chip can be reset through the electric energy stored by the energy storage element when the power is off, so that the adverse effect of reading and writing operations on the FLASH, which is generated by quitting the control element without resetting when the power is off suddenly, is avoided.
Description
Technical Field
The utility model relates to the technical field of circuits, especially, relate to a power-off reset circuit.
Background
In a centrally powered system, a number of conditions can cause the system to suddenly power down. Frequent sudden power-off has serious damage to the embedded system, especially when the CPU performs read-write operation on the FLASH.
Therefore, there is a need for a power-off reset circuit capable of completing a chip reset by stored power when power is off.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a can accomplish the outage reset circuit that the chip resets through the electric energy of storing when the outage.
In order to achieve the above object, the present invention provides a power-off reset circuit, which includes a dc power supply, a first switch circuit, an energy storage element, a second switch circuit, and a control element;
the input end of the first switch circuit is electrically connected with the energy storage element and the output end of the direct-current power supply respectively, the control end of the first switch circuit is electrically connected with the output end of the direct-current power supply through a first voltage reduction element, and the output end of the first switch circuit is electrically connected with the control end of the second switch circuit;
the input end of the second switch circuit is electrically connected with the control element, and the output end of the second switch circuit is grounded;
the energy storage element or the direct current power supply supplies power to the control element through the first switch circuit and the second switch circuit.
As an improvement, the first switch circuit further includes a second voltage-reducing element, a third voltage-reducing element, and a first switch;
the first end of the first voltage reduction element is electrically connected with the control end of the first switch, and the second end of the first voltage reduction element is electrically connected with the first end of the second voltage reduction element, the input end of the first switch, the first pole of the energy storage element and the output end of the direct-current power supply respectively;
the second end of the second voltage reduction element is grounded;
a first end of the third voltage reduction element is electrically connected with the output end of the first switch, and a second end of the third voltage reduction element is grounded;
the second pole of the energy storage element is grounded.
As an improvement, the first switch circuit further includes a diode, an anode of the diode is electrically connected to the output terminal of the dc power supply, and a cathode of the diode is electrically connected to the input terminal of the first switch and the first pole of the energy storage element.
As a modification, the second switch circuit includes a second switch and a fourth resistor;
the first end of the fourth resistor is electrically connected with the output end of the first switch, the second end of the fourth resistor is electrically connected with the control end of the second switch, the input end of the second switch is electrically connected with the control element, and the output end of the second switch is grounded.
As an improvement, the power-off reset circuit further includes a fifth resistor, a first end of the fifth resistor is electrically connected to the second end of the first voltage-reducing element, and a second end of the fifth resistor is electrically connected to the output end of the dc power supply.
As an improvement, the power-off reset circuit further includes a voltage stabilizing element, a negative electrode of the voltage stabilizing element is electrically connected to the first end of the fifth resistor, and a positive electrode of the voltage stabilizing element is grounded.
The technical scheme provided by the utility model, following advantage has: the input end of the first switch circuit is electrically connected with the energy storage element and the output end of the direct-current power supply respectively, the control end of the first switch circuit is electrically connected with the output end of the direct-current power supply through a first voltage reduction element, and the output end of the first switch circuit is electrically connected with the control end of the second switch circuit; the input end of the second switch circuit is electrically connected with the control element, and the output end of the second switch circuit is grounded; the chip can be reset through the electric energy stored by the energy storage element when the power is off, so that the adverse effect of reading and writing operations on the FLASH, which is generated by quitting the control element without resetting when the power is off suddenly, is avoided.
Drawings
Fig. 1 is a functional block diagram of a power-off reset circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a power-off reset circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a power-off reset circuit, which includes a dc power supply 50, a first switch circuit 10, an energy storage element 20, a second switch circuit 30 and a control element 40, in this embodiment, the voltage reduction elements all adopt resistors; the input end of the first switch circuit 10 is electrically connected to the energy storage element 20 and the output end of the dc power supply 50, the control end of the first switch circuit 10 is electrically connected to the output end of the dc power supply 50 through a first voltage reduction element R1, and the output end of the first switch circuit 10 is electrically connected to the control end of the second switch circuit 30; the input end of the second switch circuit 30 is electrically connected to the control element 40, the output end of the second switch circuit 30 is grounded, and the energy storage element 20 or the dc power supply 50 supplies power to the control element 40 through the first switch circuit 10 and the second switch circuit 30; when the input end of the direct current power supply 50 is electrified, the first switching circuit 10 is switched off, and the energy storage element 20 charges and stores electric energy; when the input terminal of the dc power supply 50 is powered down, the energy storage element 20 supplies power to the control element 40 through the first switch circuit 10 and the second switch circuit 30, and the reset pin of the control element 40 receives a level change signal, so that the control element 40 is reset to return to the standby state, and after the power consumption in the energy storage element 20 is completed, the control element 40 is completely powered off.
Referring to fig. 2, specifically, the first switch circuit 10 further includes a second voltage-reducing element R2, a third voltage-reducing element R3, and a first switch Q1, in this embodiment, the first switch Q1 is a PNP transistor; a first end of the first voltage-reducing element R1 is electrically connected to the control end of the first switch Q1, and a second end of the first voltage-reducing element R1 is electrically connected to the first end of the second voltage-reducing element R2, the input end of the first switch Q1, the first pole of the energy storage element 20, and the output end of the dc power supply 50, respectively; a second terminal of the second voltage reduction element R2 is grounded; a first terminal of the third voltage reduction element R3 is electrically connected to the output terminal of the first switch Q1, and a second terminal of the third voltage reduction element R3 is grounded; the second pole of the energy storage element 20 is connected to ground. Preferably, the first switch circuit 10 further includes a diode D1, an anode of the diode D1 is electrically connected to the output terminal of the dc power source 50, and a cathode of the diode D1 is electrically connected to the input terminal of the first switch Q1 and the first pole of the energy storage element 20; when the output terminal of the dc power supply 50 is powered, the first switch Q1 is turned off due to the presence of the first voltage reduction element R1; when the output of the dc power supply 50 is unpowered, the first switch Q1 is caused to be in an amplifying-saturated conducting state.
Specifically, the second switch circuit 30 includes a second switch Q2 and a fourth resistor, in this embodiment, the second switch Q2 is an NPN transistor; a first end of the fourth resistor is electrically connected with the output end of the first switch Q1, a second end of the fourth resistor is electrically connected with the control end of the second switch Q2, the input end of the second switch Q2 is electrically connected with the control element 40, and the output end of the second switch Q2 is grounded; when the first switch Q1 is in the amplification-saturation conducting state, the output end of the second switch Q2 is electrically connected with the control end of the second switch Q2, so that the level of the control end of the second switch Q2 changes, the second switch Q2 is in the saturation conducting state, the control element 40 is informed to stop working and reset, at this time, the control element 40 stops operating the peripheral circuit, the peripheral power supply is disconnected, and the standby state is returned; it should be noted that the energy storage element 20 is discharged through the third voltage-reducing element R3 and the fourth voltage-reducing element R4 for a time T1; the control unit 40 stops the operation of the peripheral circuits, turns off the peripheral power supply, and returns to the standby state for a time T2, preferably T1-T2 > 10ms, which is sufficient for the control unit 40 to return to the standby state.
Specifically, the power-off reset circuit further includes a fifth voltage stabilizing element R5, a first terminal of the fifth voltage stabilizing element R5 is electrically connected to a second terminal of the first voltage dropping element R1, and a second terminal of the fifth voltage stabilizing element R5 is electrically connected to an output terminal of the dc power supply 50; the power-off reset circuit further comprises a voltage stabilizing element D2, the negative electrode of the voltage stabilizing element D2 is electrically connected with the first end of the fifth voltage stabilizing element R5, the positive electrode of the voltage stabilizing element D2 is grounded, and the voltage stabilizing element D2 can ensure that the circuit voltage is in a stable state.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The power-off reset circuit is characterized by comprising a direct-current power supply, a first switching circuit, an energy storage element, a second switching circuit and a control element;
the input end of the first switch circuit is electrically connected with the energy storage element and the output end of the direct-current power supply respectively, the control end of the first switch circuit is electrically connected with the output end of the direct-current power supply through a first voltage reduction element, and the output end of the first switch circuit is electrically connected with the control end of the second switch circuit;
the input end of the second switch circuit is electrically connected with the control element, and the output end of the second switch circuit is grounded;
the energy storage element or the direct current power supply supplies power to the control element through the first switch circuit and the second switch circuit.
2. The power-off reset circuit of claim 1, wherein the first switching circuit further comprises a second voltage-dropping element, a third voltage-dropping element, a first switch;
the first end of the first voltage reduction element is electrically connected with the control end of the first switch, and the second end of the first voltage reduction element is electrically connected with the first end of the second voltage reduction element, the input end of the first switch, the first pole of the energy storage element and the output end of the direct-current power supply respectively;
the second end of the second voltage reduction element is grounded;
a first end of the third voltage reduction element is electrically connected with the output end of the first switch, and a second end of the third voltage reduction element is grounded;
the second pole of the energy storage element is grounded.
3. The power-off reset circuit of claim 2, wherein the first switching circuit further comprises a diode, an anode of the diode is electrically connected to the output of the dc power source, and a cathode of the diode is electrically connected to the input of the first switch and the first pole of the energy storage element.
4. The power-off reset circuit of claim 1, wherein the second switching circuit comprises a second switch and a fourth resistor;
the first end of the fourth resistor is electrically connected with the output end of the first switch, the second end of the fourth resistor is electrically connected with the control end of the second switch, the input end of the second switch is electrically connected with the control element, and the output end of the second switch is grounded.
5. The power-off reset circuit of claim 2, further comprising a fifth resistor, a first terminal of the fifth resistor being electrically connected to the second terminal of the first voltage-dropping element, a second terminal of the fifth resistor being electrically connected to the output terminal of the dc power supply.
6. The power-off reset circuit according to claim 5, further comprising a voltage stabilizing element, a negative electrode of the voltage stabilizing element being electrically connected to the first terminal of the fifth resistor, and a positive electrode of the voltage stabilizing element being grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020090424.2U CN211509027U (en) | 2020-01-15 | 2020-01-15 | Power-off reset circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020090424.2U CN211509027U (en) | 2020-01-15 | 2020-01-15 | Power-off reset circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211509027U true CN211509027U (en) | 2020-09-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020090424.2U Active CN211509027U (en) | 2020-01-15 | 2020-01-15 | Power-off reset circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211509027U (en) |
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2020
- 2020-01-15 CN CN202020090424.2U patent/CN211509027U/en active Active
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