CN203590184U - RC reset circuit having power source detection control function - Google Patents
RC reset circuit having power source detection control function Download PDFInfo
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- CN203590184U CN203590184U CN201320811528.8U CN201320811528U CN203590184U CN 203590184 U CN203590184 U CN 203590184U CN 201320811528 U CN201320811528 U CN 201320811528U CN 203590184 U CN203590184 U CN 203590184U
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- 230000000739 chaotic effect Effects 0.000 description 3
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Abstract
The utility model discloses an RC reset circuit having a power source detection control function. The RC reset circuit comprises an RC circuit and a power source, wherein a power source detection control circuit is connected between the RC circuit and the power source, the power source detection control circuit is provided with a main input end and a main output end, the main input end is electrically connected with the power source, the main output end is electrically connected with a reset power source of the RC circuit, and the power source detection control circuit is used for detecting voltage of the power source and carrying out connection or disconnection of the power source according to the voltage. When the power source voltage and a peripheral circuit state of a system needing reset are not stable, the power source detection control circuit enables the power source to be disconnected with the RC circuit, a reset input end RESET_IN is enabled to have low potential, and no reset start of the system needing reset is carried out. When the power source voltage and the peripheral circuit state of the system needing reset are stable, the power source detection control circuit enables the power source to be connected with the RC circuit, the reset input end RESET_IN is enabled to have low potential, and reset start of the system needing reset is carried out, so the system is guaranteed to have no reset confusion, and no influence is exerted on work.
Description
Technical field
The utility model relates to RC reset circuit technical field, relates in particular to a kind of RC reset circuit with power supply prosecution function.
Background technology
In prior art, RC reset circuit as shown in Figure 1, comprise RC circuit and reset power RESET_3V3, this RC circuit comprises resistance R in parallel 1, capacitor C 2 and diode D1, a termination power PWR_3V3 after above-mentioned three element parallel connections, the other end meets respectively capacitor C 1 and the RESET input RESET_IN, the other end ground connection of capacitor C 1.Existing RC reset circuit is mainly power supply PWR_3V3 directly realizes the system that needs are resetted time-delay reset by the charging of RC circuit.Because existing RC reset circuit does not possess, supply voltage is detected and control the function of processing, therefore, when power supply PWR_3V3 powers on the initial stage when also unstable, after capacitor C 1 charging, the RESET input RESET_IN voltage raises, system reset that need to reset; And needing the peripheral circuit state of the system resetting also unstable, system is easy to cause work confusion in this case, and the stability of system is reduced, and causes unnecessary loss.
Utility model content
The purpose of this utility model is to provide a kind of RC reset circuit with power supply prosecution function, this RC reset circuit is provided with power supply prosecution circuit, this power supply prosecution circuit can detect the voltage of power supply, when the prohibited acts of the unstable timing controlled the RESET input of power supply, after power supply is stable, allow the RESET input action.
For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of RC reset circuit with power supply prosecution function comprises RC circuit and power supply, described RC circuit comprises resistance R in parallel 1, capacitor C 2 and diode D1, and power supply described in the termination after parallel connection, the other end connects respectively capacitor C 1 and the RESET input, the other end ground connection of described capacitor C 1, between described RC circuit and described power supply, access power supply prosecution circuit, described power supply prosecution circuit is provided with total input and total output, described total input is electrically connected with described power supply, described total output is electrically connected with described RC circuit, described power supply prosecution circuit is for detection of the voltage of described power supply, and according to this voltage turn-on or end described power supply.
Optimal way is, described power supply prosecution circuit comprises one-level switch element and secondary switch element, described one-level switch element is provided with one-level control end, one-level input and one-level output, described one-level control end is electrically connected with one end of resistance R 4, the other end of described resistance R 4 is electrically connected with one end of resistance R 5 and resistance R 3 respectively, the other end of described resistance R 5 is described total input, the other end ground connection of described resistance R 3; Described one-level input is through resistance R 20 ground connection; Described one-level output is electrically connected with described total input through resistance R 2; Described secondary switch element is provided with secondary control end, secondary input and secondary output, and described secondary control end is electrically connected with described one-level output; Described secondary input is electrically connected with described total input, and described secondary output is described total output; Described one-level switch element is used for controlling described secondary switch element conductive or cut-off.
Optimal way is, described resistance R 20 resistances are 0, and described resistance R 2 resistances are greater than 0.
Optimal way is, described resistance R 20 resistances are greater than 0, and described resistance R 2 resistances are 0.
Optimal way is, described one-level switch element is NPN type triode, and base stage is described one-level control end, launches very described one-level input, the very described one-level output of current collection; Described secondary switch element is pmos type field effect transistor, and grid is described secondary control end, and source electrode is described secondary input, drains as described secondary output.
Optimal way is, described one-level switch element is positive-negative-positive triode, and base stage is described one-level control end, and the very described one-level input of current collection is launched very described one-level output; Described secondary switch element is nmos type field effect transistor, and grid is described secondary control end, and source electrode is described secondary input, drains as described secondary output.
Optimal way is, described one-level switch element is NPN type triode, and base stage is described one-level control end, launches very described one-level input, the very described one-level output of current collection; Described secondary switch element is nmos type field effect transistor, and grid is described secondary control end, and source electrode is described secondary input, drains as described secondary output.
Optimal way is, described one-level switch element is positive-negative-positive triode, and base stage is described one-level control end, and the very described one-level input of current collection is launched very described one-level output; Described secondary switch element is pmos type field effect transistor, and grid is described secondary control end, and source electrode is described secondary input, drains as described secondary output.
Optimal way is, described resistance R 1 is 200K Ω, and described capacitor C 1 is 4.7uF/6.3V, and described capacitor C 2 is 0.01uF/6.3V, and described resistance R 2 is 4.7K Ω, and described resistance R 3 is 5.6K Ω, and described resistance R 4 is 1K Ω, and described resistance R 5 is 27K Ω.
Adopt after technique scheme, the beneficial effects of the utility model are: because the RC reset circuit with power supply prosecution function described in the utility model comprises RC circuit and power supply, and between RC circuit and power supply, be provided with power supply prosecution circuit, this power supply prosecution circuit is provided with total input and total output, its total input and power supply electrical connection, total output is electrically connected with described reset power; Above-mentioned power supply prosecution circuit is for detection of the voltage of power supply, and according to this voltage turn-on or cut-off power supply.Unstable at supply voltage, need the peripheral circuit unstable state timing of the system resetting, when the voltage that power supply prosecution electric circuit inspection draws power supply makes to need the magnitude of voltage of the system reliable reset resetting lower than low energy, power supply and RC circuit are disconnected, the RESET input RESET_IN current potential is not raise, need the system startup that do not reset resetting.Stable at supply voltage, while needing the peripheral circuit of system that resets in stable condition, power supply prosecution electric circuit inspection draws when the voltage of power supply is greater than low energy and makes the magnitude of voltage of the system reliable reset that needs reset, make power supply and RC circuit turn-on, capacitor C 1 is charged, the RESET input RESET_IN current potential is uprised, need the system reset resetting to start.Therefore the utility model has guaranteed that system can be not chaotic when resetting, and more can not affect work.
Because described resistance R 20 resistances are 0, described resistance R 2 resistances are greater than 0, have guaranteed that one-level switch element and secondary switch element are in conducting or cut-off condition contrary in the situation that, better according to the voltage turn-on of power supply or cut-off power supply.
Because described resistance R 20 resistances are greater than 0, described resistance R 2 resistances equal 0, have guaranteed that one-level switch element and secondary switch element are in conducting or cut-off condition identical in the situation that, better according to the voltage turn-on of power supply or cut-off power supply.
Accompanying drawing explanation
Fig. 1 be prior art not with the RC reset circuit of power supply prosecution function;
Fig. 2 is the RC reset circuit with power supply prosecution function of the utility model embodiment mono-;
Fig. 3 is the RC reset circuit with power supply prosecution function of the utility model embodiment bis-;
Fig. 4 is the RC reset circuit with power supply prosecution function of the utility model embodiment tri-;
Fig. 5 is the RC reset circuit with power supply prosecution function of the utility model embodiment tetra-;
Wherein: 1-RC circuit, 2-power supply prosecution circuit, 21-one-level switch element, 22-secondary switch element.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Embodiment mono-:
As shown in Figure 2, a kind of RC reset circuit with power supply prosecution function, comprise RC circuit 1 and power supply PWR_3V3, this RC circuit 1 comprises resistance R in parallel 1, capacitor C 2 and diode D1, and the termination reset power RESET_3V3 after parallel connection, the other end meets respectively capacitor C 1 and the RESET input RESET_IN, the other end ground connection of described capacitor C 1, between described RC circuit 1 and described power supply PWR_3V3, access power supply prosecution circuit 2, this power supply prosecution circuit 2 is provided with total input and total output, this total input is electrically connected with described power supply PWR_3V3, described total output is electrically connected with described RC circuit 1, described power supply prosecution circuit 2 voltages for detection of described power supply PWR_3V3, and according to this voltage turn-on or end described power supply PWR_3V3.
Above-mentioned power supply prosecution circuit 2 comprises one-level switch element 21 and secondary switch element 22, and wherein one-level switch element 21 is NPN type triode Q1, and base stage is one-level control end, launches very one-level input, and current collection is one-level output very; Base stage is electrically connected with one end of resistance R 4, and the other end of resistance R 4 is electrically connected with one end of resistance R 5 and resistance R 3 respectively, and the other end of resistance R 5 is total input, and the other end of resistance R 5 is electrically connected with power supply PWR_3V3, the other end ground connection of resistance R 3; Emitter is through resistance R 20 ground connection; Collector electrode is electrically connected with total input through resistance R 2, is electrically connected with power supply PWR_3V3.Secondary switch element 22 is pmos type field effect transistor Q2, and grid is secondary control end, and source electrode is secondary input, drains as secondary output.Grid is electrically connected with the collector electrode of triode Q1, and source electrode is electrically connected with total input, is electrically connected with power supply PWR_3V3, and drain electrode is electrically connected with the reset power RESET_3V3 of RC circuit 1.Wherein resistance R 20 resistances are 0, and the resistance of resistance R 2 is greater than 0, make NPN type triode Q1 and pmos type field effect transistor Q2 realize conducting or cut-off power supply PWR_3V3 according to the voltage of power supply PWR_3V3.
The course of work is: triode Q1 is NPN(MMBT3904), conducting when base voltage is greater than 0.5V, field effect transistor Q2 is PMOS, conducting when grid voltage is less than 0.5V.When the voltage of power supply PWR_3V3 is less than 2.92V, by formula <2.92/ (R5+R3) * R3, calculated, the base voltage of triode Q1 is less than 0.5V, and triode Q1 is in cut-off state, and the current potential of collector electrode is high potential, and collector electrode is identical with the current potential of the grid of field effect transistor Q2, grid voltage is greater than 0.5V so, and field effect transistor Q2 enters cut-off state, and the voltage that makes reset power RESET_3V3 is 0V, need the system resetting or not, system does not start.When the voltage of power supply PWR_3V3 is greater than 2.92V, now power supply PWR_3V3 is all relatively stable with the peripheral circuit state of the system that need to reset, the base voltage of triode Q1 is greater than 0.5V, triode Q1 enters conducting state, the grid voltage of field effect transistor Q2 is about 0V simultaneously, also enters conducting state.Now the voltage of reset power RESET_3V3 is greater than 2.92V, and the capacitor C 1 of RC circuit 1 starts charging, and the RESET input RESET_IN current potential is uprised, and makes to need the system reset resetting to start, and system brings into operation.Foregoing circuit structure does not reset the RESET input RESER_IN in the situation that of power supply PWR_3V3 spread of voltage, after power supply PWR_3V3 voltage stabilization, after the peripheral circuit state that simultaneously needs the system resetting is also stable, the RESET input RESER_IN current potential uprises, and needs the system reset resetting to start.The utility model has guaranteed the not normal work of chaotic and then impact easily of system.
Embodiment bis-and embodiment mono-are basic identical, and difference is: one-level switch element 21, for positive-negative-positive triode Q1, is launched very one-level output, very one-level input of current collection; Secondary switch element 22 is nmos type field effect transistor Q2.Wherein resistance R 20 resistances are 0, and the resistance of resistance R 2 is greater than 0, are to guarantee that positive-negative-positive triode Q1 and nmos type field effect transistor Q2 realize conducting or cut-off power supply PWR_3V3 according to the voltage of power supply PWR_3V3.
The course of work is: triode Q1 is PNP(MMBT3906), conducting when base voltage is less than 0.5V, field effect transistor Q2 is NMOS, conducting when grid voltage is greater than 0.5V.When the voltage of power supply PWR_3V3 is less than 2.92V, by formula <2.92/ (R5+R3) * R3, calculated, the base voltage of triode Q1 is less than 0.5V, and triode Q1 is in conducting state, and the current potential of collector electrode is electronegative potential, and collector electrode is identical with the current potential of the grid of field effect transistor Q2, grid voltage is less than 0.5V so, and field effect transistor Q2 enters cut-off state, and the voltage that makes reset power RESET_3V3 is 0V, need the system resetting or not, system does not start.When the voltage of power supply PWR_3V3 is greater than 2.92V, now power supply PWR_3V3 is all relatively stable with the peripheral circuit state of the system that need to reset, the base voltage of triode Q1 is less than 0.5V, make triode Q1 enter cut-off state, make the grid voltage of field effect transistor Q2 be about 0.5V, enter conducting state, make the voltage of reset power RESET_3V3 be greater than 2.92V, the capacitor C 1 of RC circuit 1 starts charging, make the RESET input RESET_IN voltage increase, make to need the system reset resetting to start, system brings into operation.
Embodiment tri-: basic identical with embodiment mono-, difference is: very one-level output of the transmitting of one-level element 21 triode Q1, collector electrode one-level input, secondary switch element 22 is nmos type field effect transistor Q2, the grid of field effect transistor Q2 is electrically connected with emitter; Resistance R 20 resistances are greater than 0, and the resistance of resistance R 2 is 0, make NPN type triode Q1 and nmos type field effect transistor Q2 realize conducting or cut-off power supply PWR_3V3 according to the voltage of power supply PWR_3V3.
The course of work is: triode Q1 is NPN(MMBT3904), conducting when base voltage is greater than 0.5V, field effect transistor Q2 is NMOS, conducting when grid voltage is greater than 0.5V.When the voltage of power supply PWR_3V3 is less than 2.92V, by formula <2.92/ (R5+R3) * R3, calculated, the base voltage of triode Q1 is less than 0.5V, and triode Q1 is in cut-off state, and the current potential of collector electrode is electronegative potential, and collector electrode is identical with the current potential of the grid of field effect transistor Q2, grid voltage is less than 0.5V so, and field effect transistor Q2 enters cut-off state, and the voltage that makes reset power RESET_3V3 is 0V, need the system resetting or not, system does not start.When the voltage of power supply PWR_3V3 is greater than 2.92V, now power supply PWR_3V3 is all relatively stable with the peripheral circuit state of the system that need to reset, the base voltage of triode Q1 is greater than 0.5V, make triode Q1 enter conducting state, make the grid voltage of field effect transistor Q2 be about 0.5V, enter conducting state, make the voltage of reset power RESET_3V3 be greater than 2.92V, the capacitor C 1 of RC circuit 1 starts charging, make the RESET input RESET_IN voltage increase, make to need the system reset resetting to start, system brings into operation.
Embodiment tetra-: basic identical with embodiment tri-, difference is: one-level switch element 21 is positive-negative-positive triode Q1, launches very one-level input, very one-level output of current collection; Secondary switch element 22 is pmos type field effect transistor Q2.Wherein resistance R 20 resistances are for being greater than 0, and the resistance of resistance R 2 is 0, are to guarantee that positive-negative-positive triode Q1 and pmos type field effect transistor Q2 can realize conducting or cut-off power supply PWR_3V3 according to the voltage of power supply PWR_3V3.
The course of work is: triode Q1 is PNP(MMBT3906), conducting when base voltage is less than 0.5V, field effect transistor Q2 is PMOS, conducting when grid voltage is less than 0.5V.When the voltage of power supply PWR_3V3 is less than 2.92V, by formula <2.92/ (R5+R3) * R3, calculated, the base voltage of triode Q1 is less than 0.5V, triode Q1 is in cut-off state, and the current potential of collector electrode is high potential, and collector electrode is identical with the current potential of the grid of field effect transistor Q2, grid voltage is greater than 0.5V so, field effect transistor Q2 enters cut-off state, and making the voltage of reset power RESET_3V3 is 0V, and system does not start.When the voltage of power supply PWR_3V3 is greater than 2.92V, now power supply PWR_3V3 is all relatively stable with the peripheral circuit state of the system that need to reset, the base voltage of triode Q1 is less than 0.5V, make triode Q1 enter conducting state, make the grid voltage of field effect transistor Q2 be about 0V, enter conducting state, make the voltage of reset power RESET_3V3 be greater than 2.92V, the capacitor C 1 of RC circuit 1 starts charging, make the RESET input RESET_IN voltage increase, make to need the system reset resetting to start, system brings into operation.
In above-mentioned all embodiment, resistance R 2 is 4.7K Ω, and resistance R 3 is 5.6K Ω, and resistance R 4 is 1K Ω, and resistance R 5 is 27K Ω.
It should be noted that, 2.92V is the minimum voltage value that can make its system reliable reset that need to reset in above-mentioned all embodiment, in the system that need to reset at other, can revise this voltage according to the resistance that need to adjust R5 and R3 of system.
In sum, RC reset circuit with power supply prosecution function described in the utility model, utilize power supply prosecution circuit 2 between RC circuit 1 and power supply to detect the voltage of power supply, when power supply electrifying initial stage voltage is also unstable, need the peripheral circuit state of the system resetting also unstable, the voltage that power supply prosecution circuit 2 can detect power supply makes to need the magnitude of voltage of the system reliable reset resetting lower than low energy, system reset action does not start; After tending towards stability at power supply electrifying voltage, need the state of the peripheral circuit of the system resetting also to tend towards stability, the voltage that power supply prosecution circuit 2 can detect power supply is greater than low energy and makes the magnitude of voltage of the system reliable reset that needs reset, now power supply and RC circuit 1 are switched on, capacitor C 1 is charged, the RESET input RESET_IN current potential is uprised, need the system reset resetting to start.Therefore the utility model has guaranteed that system can be not chaotic when resetting, and more can not affect work, has improved the stability of system reset operation.
The above preferred embodiment of the present utility model, not in order to limit the utility model, all any modifications of doing within spirit of the present utility model and principle, is equal to and replaces and improvement etc., within all should being included in protection range of the present utility model.
Claims (9)
1. with the RC reset circuit of power supply prosecution function, comprise RC circuit and power supply, described RC circuit comprises resistance R in parallel 1, capacitor C 2 and diode D1, and power supply described in the termination after parallel connection, the other end connects respectively capacitor C 1 and the RESET input, the other end ground connection of described capacitor C 1, it is characterized in that: between described RC circuit and described power supply, access power supply prosecution circuit, described power supply prosecution circuit is provided with total input and total output, described total input is electrically connected with described power supply, described total output is electrically connected with described RC circuit, described power supply prosecution circuit is for detection of the voltage of described power supply, and according to this voltage turn-on or end described power supply.
2. the RC reset circuit with power supply prosecution function according to claim 1, is characterized in that: described power supply prosecution circuit comprises one-level switch element and secondary switch element;
Described one-level switch element is provided with one-level control end, one-level input and one-level output, described one-level control end is electrically connected with one end of resistance R 4, the other end of described resistance R 4 is electrically connected with one end of resistance R 5 and resistance R 3 respectively, the other end of described resistance R 5 is described total input, the other end ground connection of described resistance R 3; Described one-level input is through resistance R 20 ground connection; Described one-level output is electrically connected with described total input through resistance R 2;
Described secondary switch element is provided with secondary control end, secondary input and secondary output, and described secondary control end is electrically connected with described one-level output, and described secondary input is electrically connected with described total input, and described secondary output is described total output; Described one-level switch element is used for controlling described secondary switch element conductive or cut-off.
3. the RC reset circuit with power supply prosecution function according to claim 2, is characterized in that: described resistance R 20 resistances are 0, and described resistance R 2 resistances are greater than 0.
4. the RC reset circuit with power supply prosecution function according to claim 2, is characterized in that: described resistance R 20 resistances are greater than 0, and described resistance R 2 resistances are 0.
5. the RC reset circuit with power supply prosecution function according to claim 2, it is characterized in that: described one-level switch element is NPN type triode, base stage is described one-level control end, launches very described one-level input, the very described one-level output of current collection; Described secondary switch element is pmos type field effect transistor, and grid is described secondary control end, and source electrode is described secondary input, drains as described secondary output.
6. the RC reset circuit with power supply prosecution function according to claim 2, it is characterized in that: described one-level switch element is positive-negative-positive triode, base stage is described one-level control end, and the very described one-level input of current collection is launched very described one-level output; Described secondary switch element is nmos type field effect transistor, and grid is described secondary control end, and source electrode is described secondary input, drains as described secondary output.
7. the RC reset circuit with power supply prosecution function according to claim 2, it is characterized in that: described one-level switch element is NPN type triode, base stage is described one-level control end, launches very described one-level input, the very described one-level output of current collection; Described secondary switch element is nmos type field effect transistor, and grid is described secondary control end, and source electrode is described secondary input, drains as described secondary output.
8. the RC reset circuit with power supply prosecution function according to claim 2, it is characterized in that: described one-level switch element is positive-negative-positive triode, base stage is described one-level control end, and the very described one-level input of current collection is launched very described one-level output; Described secondary switch element is pmos type field effect transistor, and grid is described secondary control end, and source electrode is described secondary input, drains as described secondary output.
9. according to the RC reset circuit with power supply prosecution function described in claim 2 to 8 any one, it is characterized in that: described resistance R 1 is 200K Ω, described capacitor C 1 is 4.7uF/6.3V, described capacitor C 2 is 0.01uF/6.3V, described resistance R 2 is 4.7K Ω, described resistance R 3 is 5.6K Ω, and described resistance R 4 is 1K Ω, and described resistance R 5 is 27K Ω.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320811528.8U CN203590184U (en) | 2013-12-10 | 2013-12-10 | RC reset circuit having power source detection control function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320811528.8U CN203590184U (en) | 2013-12-10 | 2013-12-10 | RC reset circuit having power source detection control function |
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| CN203590184U true CN203590184U (en) | 2014-05-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647535A (en) * | 2013-12-10 | 2014-03-19 | 青岛歌尔声学科技有限公司 | RC reset circuit with power supply inspection and control function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647535A (en) * | 2013-12-10 | 2014-03-19 | 青岛歌尔声学科技有限公司 | RC reset circuit with power supply inspection and control function |
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Granted publication date: 20140507 |