CN102522968A - Reset circuit for multi-power-supply system - Google Patents
Reset circuit for multi-power-supply system Download PDFInfo
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- CN102522968A CN102522968A CN2011104396983A CN201110439698A CN102522968A CN 102522968 A CN102522968 A CN 102522968A CN 2011104396983 A CN2011104396983 A CN 2011104396983A CN 201110439698 A CN201110439698 A CN 201110439698A CN 102522968 A CN102522968 A CN 102522968A
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Abstract
The invention discloses a reset circuit for a multi-power-supply system, which comprises a logic circuit and a signal follower circuit connected with the logic circuit, wherein the multiple system power supplies of the multi-power-supply system are connected in parallel to the logic circuit. When voltage value output by any one of the multiple system power supplies is lower than a preset reset threshold voltage, the logic circuit generates an initial reset voltage signal and outputs the initial reset voltage signal to the signal follower circuit. The signal follower circuit performs voltage follower processing to the initial reset voltage signal so as to generate and output a reset signal. The reset circuit for the multi-power-supply system uses at least two system power supplies already existing in the multi-power-supply system for a reset work signal of the reset circuit, is capable of meeting the requirement for timing sequence of the reset signal in the multi-power-supply system, removes an existing timing sequence control circuit used for controlling the system power supplies, simplifies design of the reset circuit of the whole system, and meanwhile improves reliability of reset timing sequence of the reset signal provided by the system.
Description
Technical field
The present invention relates to the reset circuit field, in particular to a kind of reset circuit that is used for multi-power system.
Background technology
For the reset circuit of multi-power system, in application process, require reset circuit always to satisfy the back and go up the requirement under the elder generation; Promptly reset circuit will be in reset mode when all power supply electrifyings; And behind all power supply electrifyings, just can remove reset signal, simultaneously, when electricity under all power supplys; Require this reset circuit will be in reset mode earlier, a plurality of power supplys in the system just down afterwards.
Based on this, at present for multi-power system, can operate as normal in order to ensure multi-power system; Power supply under going up earlier after sequential of needs selection is done the working power of reset circuit; But for this power supply, need to increase the peripheral circuit of a series of complicacies, to satisfy the working power sequential requirement that reset circuit produces reset signal; This mode circuit is comparatively complicated, and cost is higher.
In a kind of in addition mode; As shown in Figure 1; Reset circuit for present single working power; For power at multi-power system back and all power supplys make reset signal be in the state of coming into force (for example effective when reset signal is low level) before stable; And under multi-power system when electricity reset signal be in the state of coming into force, for the reset signal that guarantees its generation satisfy as the described back of Fig. 2 go up earlier under the sequential requirement, need in this multi-power system, increase the sequential that power supply sequencing control circuit is controlled a plurality of power supplys.Control the power-on and power-off sequential of each power supply through power supply sequencing control circuit; The requirement under thereby the satisfied back that guarantees the reset signal that reset circuit produces is gone up earlier; But this power supply sequencing control circuit that increases is more complicated comparatively speaking, and has increased the cost in the design.
Summary of the invention
The object of the present invention is to provide a kind of reset circuit that is used for multi-power system, it can satisfy the sequential requirement of reset signal in the multi-power system, and this reset circuit is comparatively simple simultaneously, thereby has controlled the design and the implementation cost of reset circuit to a certain extent.
In order to reach the object of the invention, the present invention adopts following technical scheme to realize:
A kind of reset circuit that is used for multi-power system; It comprises with logical circuit and with the said signal follow circuit that is connected with logical circuit; Wherein, A plurality of system power supplies of said multi-power system are connected in parallel to said and logical circuit; When the magnitude of voltage of any one output in said a plurality of system power supplies was lower than preset reset threshold voltage, said and logical circuit generated the initial reset voltage signal and exports it to signal follow circuit, and said signal follow circuit carries out voltage follow to said initial reset voltage signal to be handled to generate reset signal and to export.
Preferably, said signal follow circuit is the low level reset signal to the reset signal that said initial reset voltage signal carries out generating after voltage follow is handled.
Preferably; Said and logical circuit comprise a plurality of first divider resistances that are connected in parallel and second divider resistance of the first end ground connection; The common port of said a plurality of first divider resistances is connected with second end of said second divider resistance, and the common port of said a plurality of first divider resistances also is connected to the input of signal follow circuit.
Preferably; Said and logical circuit comprises that also first regulates the resistance and the second adjusting resistance; Said first regulates resistance is connected between the common port and second divider resistance of said a plurality of first divider resistances; First end of the said second adjusting resistance is connected to the input of signal follow circuit, and second end of the said second adjusting resistance is connected to second end of second divider resistance.
Preferably; Said signal follow circuit comprises first triode, second triode and first pull-up resistor, and the base stage of said first triode is connected to the common port of said a plurality of first divider resistances, its grounded emitter; Its collector electrode connects high level through said first pull-up resistor; And be connected with the base stage of said second triode, the grounded emitter of said second triode, its current collection is the reset signal output very.
Preferably; Said signal follow circuit comprises first triode, second triode and first pull-up resistor, and the base stage of said first triode is connected to first end of the said second adjusting resistance, its grounded emitter; Its collector electrode connects high level through said first pull-up resistor; And be connected with the base stage of said second triode, the grounded emitter of said second triode, its current collection is the reset signal output very.
Preferably; Said signal follow circuit also comprises second pull-up resistor and the delay capacitor that powers on; The first termination high level of said second pull-up resistor; Its second end is connected to the collector electrode of second triode and is connected the second end ground connection of the said delay capacitor that powers on first end of the said delay capacitor that powers on.
Technical scheme through the invention described above can be found out; The present invention adopts existing at least two system power supplies in the multi-power system or signal to be used for the working signal that resets of this reset circuit; It can satisfy the sequential requirement of reset signal in the multi-power system; It has omitted existing sequential control circuit in order to control system power supply sequential, simplified the reset circuit design of whole system, has improved the reliability of the reset timing of the reset signal that system provides simultaneously.
Description of drawings
Fig. 1 is existing reset signal sequential generating structure sketch map;
Fig. 2 is the reset signal sequential sketch map of multi-power system requirement;
Fig. 3 is the reset circuit structural representation that is used for multi-power system that the embodiment of the invention provides;
Fig. 4 is the circuit diagram of the reset circuit that is used for multi-power system that provides of the embodiment of the invention;
Fig. 5 satisfies the back to go up the reset signal sequential sketch map that sequential requires under the elder generation in the embodiment of the invention;
Fig. 6 is the electric at present together reset signal sequential chart of two system power supplies in the embodiment of the invention;
Fig. 7 is the reset signal sequential chart that two system power supplies power on simultaneously in the embodiment of the invention.
The realization of the object of the invention, functional characteristics and excellent effect will combine specific embodiment and accompanying drawing to do further explanation below.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment technical scheme according to the invention is done further to describe in detail so that those skilled in the art can better understand the present invention and can implement, but the embodiment that lifts not conduct to qualification of the present invention.
The embodiment of the invention provides a kind of reset circuit that is used for multi-power system; As shown in Figure 3; It comprises with logical circuit 20 and with the said signal follow circuit 30 that is connected with logical circuit 20; Wherein, A plurality of system power supplies 10 of said multi-power system (system power supply 1, system power supply 2 ... system power supply X) be connected in parallel to said and logical circuit 20; When the magnitude of voltage of any one output in said a plurality of system power supplies 10 was lower than preset reset threshold voltage, said and logical circuit 20 generated the initial reset voltage signals and exports it to signal follow circuit 30, and 30 pairs of said initial reset voltage signals of said signal follow circuit carry out voltage follow to be handled to generate reset signal and to export.
For this reset circuit; The said processing that can export the initial reset voltage signal according to the output voltage of system power supply 10 with logical circuit 20 that be connected to a plurality of system power supplies 10; Said initial reset voltage signal is further carried out voltage follow by signal follow circuit 30 to be handled, and goes up reset signal and the output that sequential requires under the elder generation thereby generate final satisfied back.When multi-power system powers on; Said and logical circuit 20 detects the output voltage situation of a plurality of system power supplies 10; Have only when the voltage of all system power supplies 10 has all exceeded preset reset threshold voltage; This reset circuit just stops the generation of reset signal, otherwise, just generate reset signal to satisfy the needs of this system works always; When electricity under multi-power system; Said and logical circuit 20 also detects the output voltage situation of a plurality of system power supplies 10 in real time; As long as the voltage of any one system power supply 10 output in this system is lower than preset reset threshold voltage, then this reset circuit promptly generates reset signal to satisfy the needs of system works.
In embodiments of the present invention; The reset signal that 30 pairs of said initial reset voltage signals of said signal follow circuit carry out generating after voltage follow is handled can be high level signal; Also can be low level, present embodiment will be an example with the reset signal that generates, and further explain the present invention.
The reset circuit structural representation that is used for multi-power system as shown in Figure 4, that it provides for the embodiment of the invention.Wherein, Said and logical circuit 20 comprise a plurality of first divider resistances of being connected in parallel (R1, R2 ... Rx) and the second divider resistance R5 of the first end ground connection; Said a plurality of first divider resistance (R1, R2 ... common port Rx) is connected with second end of the said second divider resistance R5, and said a plurality of first divider resistance (R1, R2 ... common port Rx) also is connected to the input of signal follow circuit 30.Said a plurality of first divider resistance (R1, R2 ... Rx) be connected to respectively corresponding system power supply 10 (system power supply 1, system power supply 2 ... system power supply X) in order to the voltage of gathering its output (VD1, VD2 ... VDx).
Under this preferred implementation; Said signal follow circuit 30 comprises the first triode Q1, the second triode Q2 and the first pull-up resistor R6, the base stage of the said first triode Q1 be connected to said a plurality of first divider resistance (R1, R2 ... common port Rx), its grounded emitter; Its collector electrode meets high level VIO through the said first pull-up resistor R6; And be connected with the base stage of the said second triode Q2, the grounded emitter of the said second triode Q2, its current collection is the reset signal output very.
More preferably; Said and logical circuit 20 comprises that also first regulates the resistance R 3 and the second adjusting resistance R 4; Said first regulate resistance R 3 be connected in said a plurality of first divider resistance (R1, R2 ... between common port Rx) and the second divider resistance R5; First end of the said second adjusting resistance R 4 is connected to the input of signal follow circuit 30, and second end of the said second adjusting resistance R 4 is connected to second end of the second divider resistance R5.Regulate the resistance R 3 and the second adjusting resistance R 4, the size that can regulate the magnitude of voltage Vb that exports with logical circuit 20 through being provided with said first.
Under this execution mode; Said signal follow circuit 30 comprises the first triode Q1, the second triode Q2 and the first pull-up resistor R6, and the base stage of the said first triode Q1 is connected to said second and regulates first end of resistance R 4, its grounded emitter; Its collector electrode meets high level VIO through the said first pull-up resistor R6; And be connected with the base stage of the said second triode Q2, the grounded emitter of the said second triode Q2, its current collection is the reset signal output very.
Continuation is with reference to Fig. 4; The for example judgement that resets of the voltage signal of the reset circuit that provides of the embodiment of the invention through sampling two-way system power supply 10 (VD1, VD2); As long as there is the voltage signal of one tunnel system power supply 10 to be lower than the reset threshold voltage that is provided with in advance; Perhaps the voltage signal of two-way system power supply 10 is lower than this reset threshold voltage simultaneously; This reset circuit is just exported reset signal, and said reset signal can satisfy reset timing requirement as shown in Figure 5, when promptly system powers on and all system power supplies 10 stable before; And when electricity and just had system power supply 10 to begin to descend and when being lower than said reset threshold voltage, this reset circuit promptly generates the reset signal (low level is effective) that comes into force under the system.Because this reset circuit only needs several resistance and triode, the more existing reset circuit of circuit is simple, and its cost is lower.
More preferred embodiment; Continuation is with reference to Fig. 4; Said signal follow circuit 30 also comprises the second pull-up resistor R7 and the delay capacitor C1 that powers on; The first termination high level of the said second pull-up resistor R7, its second end are connected to the collector electrode of the second triode Q2 and are connected the second end ground connection of the said delay capacitor C1 that powers on first end of the said delay capacitor C1 that powers on.Wherein, said delay capacitor C1 and the second pull-up resistor R7 of powering on plays the electrification reset time-lag action.Promptly when the voltage output value of a plurality of system power supplies 10 of multi-power system has all exceeded the reset threshold voltage that is provided with in advance, because the said electrification reset time-lag action that powers on delay capacitor C1 and the second pull-up resistor R7 makes reset signal can postpone the regular hour disappearance.
Through the reset circuit that the invention described above embodiment provides, it can generate the reset signal that the reset timing under the elder generation is gone up in satisfied back, and for example, when two system power supplies 10 were electric at present together in the system, it can generate reset signal sequential as shown in Figure 6; When two system power supplies 10 powered on simultaneously in the system, it can generate the described reset signal sequential like Fig. 7.
The reset circuit that the embodiment of the invention provides; Through the first divider resistance R1 and R2 sample simultaneously the voltage signal VD1 and the VD2 of two-way system power supply 10; As long as and the two-way voltage that collects one the tunnel is low level wherein, the first triode Q1 ends, the reset signal of reset circuit output low level; When the VD1 of two-way system power supply 10 output is high level simultaneously with VD2, the first triode Q1 conducting, reset circuit is exported high level, and reset signal is in failure state.This reset circuit be equivalent to that VD1 for two-way system power supply 10 output asks with VD2 and; And can regulate the parameter that resistance R 3, second is regulated resistance R 4, the second divider resistance R5 through regulating the first divider resistance R1 and R2, first, define the high-low level voltage relationship point of VD1 and VD2.In practical application; The first adjusting resistance R 3 and second is regulated resistance R 4 and is played the debugging effect; In the practical implementation process; Said first regulates resistance R 3 and second regulates resistance R 4 and can adopt the direct short circuit of 0ohm resistance, and is deriving when calculating above-mentioned each resistance value, regulates resistance R 3 and the second adjusting resistance R 4 all can the 0ohm substitution be calculated just passable for said first.
Above-mentioned each resistance is used relation and can be given an example as follows:
Because VD1 and VD2 need produce effects equivalent on the base stage of the first triode Q1, just VD1 and electric current that VD2 forms on the first divider resistance R1 and the first divider resistance R2 need consistently, so have:
VD1/VD2=R1/R2; Formula 1
The partial pressure value of the first adjusting resistance R 3 and the second divider resistance R5 is:
Vb=V*R5/ (R3+R5); Formula 2
Because during the first not conducting of triode Q1, second electric current regulated on the resistance R 4 is 0, regulates resistance R 4 so can ignore second when calculating, and can be got by the electric current that flows through on the first divider resistance R1, the first divider resistance R2 and the second divider resistance R5
Got by formula 1, formula 2, formula 3, the voltage Vb that is divided to the first triode Q1 base stage is:
Vb=R5* (VD1*R2+VD2*R1)/[R1*R2+ (R1+R2) * (R3+R5)]; Formula 4
When VD1 and one of them voltage of VD2 are low level,, can know that the voltage Vb that therefore is divided to the said first triode Q1 base stage is Vb＜0.5V because this moment, the first triode Q1 ended according to the cut-ff voltage of the first triode Q1; When VD1 and VD2 are high level simultaneously, because first triode Q1 conducting this moment can know that according to the conducting voltage of the first triode Q1 Vb＞0.7V is arranged; Can know VD1*R2=VD2*R1 by formula 1,, can establish and have only the power supply of one tunnel system power supply by formula 4; Another road system power supply is 0 o'clock, Vb=a (wherein, said a is a calculated factor); When two-way is supplied power simultaneously so, Vb=2a:
A=R5*VD2*R1/ [R1*R2+ (R1+R2) * (R3+R5)]＜0.5; Formula 5
2a=R5* (VD1*R2+VD2*R1)/[R1*R2+ (R1+R2) * (R3+R5)]＞0.7; Formula 6
Thereby calculated factor a has the relation of 0.35＜a＜0.5, thereby can obtain the relation that the first divider resistance R2 and second regulates resistance R 3, the second divider resistance R5:
R2=[VD1*VD2*R5-a* (VD1+VD2) * (R3+R5)]/(a*VD1); Formula 7
Get by formula 1 and formula 7:
R1=[VD1*VD2*R5-a* (VD1+VD2) * (R3+R5)]/(a*VD2); Formula 8
Scope by formula 7 and a just can obtain the relation that the first divider resistance R2 and first regulates resistance R 3, the second divider resistance R5:
If VD1=5V, VD2=5V gets R5=2.7K, R3=5.6K, and a=0.43, and can get:
R1≈15K，R2≈15K。
Also be not difficult to find through above-mentioned computing; Voltage Vb through the said first triode Q1 base stage that calculates; And said first divider resistance (R1, R2 ... Rx), first regulate the resistance R 3 and the second divider resistance R5 size; Be not difficult to calculate the sizes values of the reset threshold voltage that the embodiment of the invention provides; Those skilled in the art are not difficult here this to be given unnecessary details no longer in detail through calculating the sizes values of said reset threshold voltage on the circuit base that provides according to accompanying drawing 3.
Instantiation through the invention described above embodiment provides can be known, through the present invention, can define the parameter size of each resistance fast and accurately, thereby make the operation that this reset circuit can be simple and reliable.
The above is merely the preferred embodiments of the present invention; Be not so limit claim of the present invention; Every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (7)
1. reset circuit that is used for multi-power system; It is characterized in that; Comprise with logical circuit and with the said signal follow circuit that is connected with logical circuit; Wherein, a plurality of system power supplies of said multi-power system are connected in parallel to said and logical circuit, when the magnitude of voltage of any one output in said a plurality of system power supplies is lower than preset reset threshold voltage; Said and logical circuit generates the initial reset voltage signal and exports it to signal follow circuit, and said signal follow circuit carries out voltage follow to said initial reset voltage signal to be handled to generate reset signal and to export.
2. the reset circuit that is used for multi-power system as claimed in claim 1 is characterized in that, after said signal follow circuit carried out the voltage follow processing to said initial reset voltage signal, the reset signal of generation was the low level reset signal.
3. the reset circuit that is used for multi-power system as claimed in claim 2; It is characterized in that; Said and logical circuit comprise a plurality of first divider resistances that are connected in parallel and second divider resistance of the first end ground connection; The common port of said a plurality of first divider resistances is connected with second end of said second divider resistance, and the common port of said a plurality of first divider resistances also is connected to the input of signal follow circuit.
4. the reset circuit that is used for multi-power system as claimed in claim 3; It is characterized in that; Said and logical circuit comprises that also first regulates the resistance and the second adjusting resistance; Said first regulates resistance is connected between the common port and second divider resistance of said a plurality of first divider resistances, and first end of the said second adjusting resistance is connected to the input of signal follow circuit, and second end of the said second adjusting resistance is connected to second end of second divider resistance.
5. the reset circuit that is used for multi-power system as claimed in claim 3; It is characterized in that; Said signal follow circuit comprises first triode, second triode and first pull-up resistor, and the base stage of said first triode is connected to the common port of said a plurality of first divider resistances, its grounded emitter; Its collector electrode connects high level through said first pull-up resistor; And be connected with the base stage of said second triode, the grounded emitter of said second triode, its current collection is the reset signal output very.
6. the reset circuit that is used for multi-power system as claimed in claim 4 is characterized in that, said signal follow circuit comprises first triode, second triode and first pull-up resistor; The base stage of said first triode is connected to first end of the said second adjusting resistance; Its grounded emitter, its collector electrode connects high level through said first pull-up resistor, and is connected with the base stage of said second triode; The grounded emitter of said second triode, its current collection is the reset signal output very.
7. like claim 5 or the 6 described reset circuits that are used for multi-power system; It is characterized in that; Said signal follow circuit also comprises second pull-up resistor and the delay capacitor that powers on; The first termination high level of said second pull-up resistor, its second end are connected to the collector electrode of second triode and are connected the second end ground connection of the said delay capacitor that powers on first end of the said delay capacitor that powers on.
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| CN102981586A (en) * | 2012-11-23 | 2013-03-20 | 西安坤蓝电子技术有限公司 | Low-level reset circuit and reset method of multi-reset-source-to-multi-processor system |
| CN103391076A (en) * | 2013-07-05 | 2013-11-13 | 曙光信息产业股份有限公司 | Secondary reset circuit and reset method |
| CN108173537A (en) * | 2018-01-02 | 2018-06-15 | 京东方科技集团股份有限公司 | Restart circuit and electronic equipment |
| CN111596585A (en) * | 2020-05-19 | 2020-08-28 | 珠海格力智能装备有限公司 | System control method, circuit, electronic device, and storage medium |
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| CN106411301B (en) * | 2016-11-11 | 2024-04-19 | 国网山东省电力公司临邑县供电公司 | High-low level mixed effective switch reset circuit |
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Cited By (9)
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| CN102981586A (en) * | 2012-11-23 | 2013-03-20 | 西安坤蓝电子技术有限公司 | Low-level reset circuit and reset method of multi-reset-source-to-multi-processor system |
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| CN103391076B (en) * | 2013-07-05 | 2016-02-10 | 曙光信息产业股份有限公司 | Secondary reset circuit and repositioning method |
| CN106411301B (en) * | 2016-11-11 | 2024-04-19 | 国网山东省电力公司临邑县供电公司 | High-low level mixed effective switch reset circuit |
| CN108173537A (en) * | 2018-01-02 | 2018-06-15 | 京东方科技集团股份有限公司 | Restart circuit and electronic equipment |
| CN108173537B (en) * | 2018-01-02 | 2021-12-31 | 京东方科技集团股份有限公司 | Restart circuit and electronic equipment |
| WO2021056908A1 (en) * | 2019-09-29 | 2021-04-01 | 苏州浪潮智能科技有限公司 | Method for detecting rationality of pg pin power-on time sequence, system and related components |
| US11863178B2 (en) | 2019-09-29 | 2024-01-02 | Inspur Suzhou Intelligent Technology Co., Ltd. | Method for detecting rationality of PG pin power-on time sequence, system and related components |
| CN111596585A (en) * | 2020-05-19 | 2020-08-28 | 珠海格力智能装备有限公司 | System control method, circuit, electronic device, and storage medium |
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Application publication date: 20120627 |