CN104569562A - Supply voltage stable output signal detection circuit and electric equipment applying same - Google Patents
Supply voltage stable output signal detection circuit and electric equipment applying same Download PDFInfo
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- CN104569562A CN104569562A CN201410805334.6A CN201410805334A CN104569562A CN 104569562 A CN104569562 A CN 104569562A CN 201410805334 A CN201410805334 A CN 201410805334A CN 104569562 A CN104569562 A CN 104569562A
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Abstract
The invention discloses a supply voltage stable output signal detection circuit and electric equipment applying the same. The supply voltage stable output signal detection circuit comprises at least one supply voltage input detection branch circuit, a comparison branch circuit and an output branch circuit, wherein the supply voltage input detection branch circuits are used for receiving supply voltage to be detected and preset supply voltage values corresponding to the supply voltage to be detected; the comparison branch circuit is used for comparing the received supply voltage to be detected with the preset supply voltage value corresponding to the supply voltage to be detected and outputting a comparison result; the output branch circuit is used for sending a prompt signal according to the comparison result. According to the technical scheme provided by the invention, whether supply voltage, which supplies electric energy for all modules, in the electronic equipment is stably output or not is detected to prompt whether the whole system starts the next operation or not, so that the abnormal operation probability of the whole product or equipment is lowered.
Description
Technical field
The present invention relates to electric and electronic technical field, particularly a kind of supply voltage is stablized output signal testing circuit and is had the electric equipment of this circuit.
Background technology
Along with development, the function of electronic product and equipment and the constantly perfect of performance of electronic product and equipment de-sign.Due to modules different designs demand in electronic product and equipment, usually need to provide electric energy by different voltage signals for it respectively.Like this, just make electronic product and equipment before normal operation, stable electric energy must be had to provide energy for it.
In the operational process of existing electronic product and equipment, inventor finds that in prior art, at least there are the following problems:
Existing electronic product and equipment after powering, do not carry out stable output detections to the supply voltage of various piece usually; So easily occur that the supply voltage of part of module does not reach setting value, whole electronic product or equipment are just started working operation.Like this, once wherein the supply voltage of some exports unstable, then this module cannot normally be run, thus causes whole product or equipment normally not to run.
Summary of the invention
In view of the above problems, proposing the present invention to provide a kind of overcomes the problems referred to above or solves the problem at least in part, and technical scheme of the present invention is achieved in that
On the one hand, the invention provides a kind of supply voltage stable output signal testing circuit, comprising: at least one road supply voltage input detection branch, compare branch road and export branch road;
Described supply voltage input detection branch, for receiving supply voltage to be detected and the default supply voltage value corresponding with it;
Describedly compare branch road, for the supply voltage described to be detected that receives described in relatively and the default supply voltage value corresponding with it, export comparative result;
Described output branch road, according to described comparative result, sends described cue.
Preferably, described default supply voltage value, according to described supply voltage to be detected, adopts high precision regulating resistor series connection dividing potential drop to realize.
Preferably, when described supply voltage input detection branch comprises a road supply voltage input detection branch; Described supply voltage input detection branch comprises: resistance R1 ', resistance R2 '; The described branch road that compares comprises: comparer U-C; Described output branch road comprises: resistance R6 ', diode;
Described resistance R1 ' one end is connected with described power supply VBAT; The other end respectively with described resistance R2 ' one end, described comparer U-C input pin 2 is connected; Described resistance R2 ' other end ground connection; Described comparer U-C input pin 1 is connected with described supply voltage V1 to be detected; Described comparer U-C output pin 8 is connected with described resistance R6 ' one end, and the other end is connected with described diode cathode end; The negative pole end ground connection of described diode.
Preferably, when described supply voltage input detection branch comprises three-way power voltage input detection branch; Described supply voltage input detection branch comprises: resistance R1, resistance R2, resistance R3, resistance R4; The described branch road that compares comprises: comparer U1-A, comparer U1-B, comparer U1-C; Described output branch road comprises: resistance R5, resistance R6, resistance R7, resistance R8, switching tube Q1, switching tube Q2, diode;
Described resistance R1 mono-termination power VBAT, the other end respectively with described resistance R2 one end, described comparer U1-A input pin 2 is connected; Described comparer U1-A input pin 3 meets described supply voltage V1 to be detected; Described comparer U1-A output pin 1 is connected with described resistance R7 one end; The C end of switching tube Q1 described in described another termination of resistance R7;
The described resistance R2 other end respectively with described resistance R3 one end, described comparer U1-B input pin 6 is connected; Described comparer U1-B input pin 5 meets described supply voltage V2 to be detected; Described comparer U1-B output pin 7 is connected with described resistance R8 one end, the B end of switching tube Q1 described in described another termination of resistance R8;
The described resistance R3 other end respectively with described resistance R4 one end, described comparer U1-C input pin 9 is connected; Described comparer U1-C input pin 10 meets described supply voltage V3 to be detected; Described comparer U1-C output pin 8 is connected with described resistance R6 one end; The positive terminal of diode described in described another termination of resistance R6;
Described resistance R4 other end ground connection;
The C end of switching tube Q2 described in the negative pole termination of described diode, the E of described switching tube Q2 holds ground connection; The B end of described switching tube Q2 connects one end of described resistance R5 respectively, the E end of described switching tube Q1; Described resistance R5 other end ground connection.
Preferably, described switching tube Q1 is triode or metal-oxide-semiconductor; Described switching tube Q2 is triode or metal-oxide-semiconductor.
On the other hand, the invention provides a kind of electric equipment, comprising: supply voltage as above stable output signal testing circuit.
Technical scheme of the present invention is by more described supply voltage to be detected and the default supply voltage value corresponding with it; Judge whether supply voltage to be detected reaches the energy supply demand of modules in electronic equipment, thus whole system can be pointed out whether to run next step operation, thus reduce the irregular operating probability of whole product or equipment.Meanwhile, the reason of system irregular operating can also indirectly be indicated.
Accompanying drawing explanation
A kind of supply voltage stable output signal testing circuit structural representation that Fig. 1 provides for the embodiment of the present invention;
A kind of supply voltage stable output signal testing circuit figure that Fig. 2 provides for the embodiment of the present invention;
The another kind of supply voltage stable output signal testing circuit figure that Fig. 3 provides for the embodiment of the present invention;
A kind of electric equipment structural representation that Fig. 4 provides for the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Stablize output signal testing circuit as Fig. 1 for a kind of supply voltage being depicted as the embodiment of the present invention and providing and there is the electric equipment of this circuit; This supply voltage stable output signal testing circuit comprises: at least one road supply voltage input detection branch, compares branch road and exports branch road;
Described supply voltage input detection branch, for receiving supply voltage to be detected and the default supply voltage value corresponding with it;
Describedly compare branch road, for the supply voltage described to be detected that receives described in relatively and the default supply voltage value corresponding with it, export comparative result;
Described output branch road, according to described comparative result, sends described cue.
It should be noted that, described default supply voltage value, according to described supply voltage to be detected, can adopt high precision regulating resistor series connection dividing potential drop to realize.
Based on above embodiment, when described supply voltage input detection branch comprises a road supply voltage input detection branch, as shown in Figure 2, be a kind of voltage stabilization output signal testing circuit that the embodiment of the present invention provides;
Described supply voltage input detection branch comprises: resistance R1 ', resistance R2 '; The described branch road that compares comprises: comparer U-C; Described output branch road comprises: resistance R6 ', diode;
Described resistance R1 ' one end is connected with described power supply VBAT; The other end respectively with described resistance R2 ' one end, described comparer U-C input pin 2 is connected; Described resistance R2 ' other end ground connection; Described comparer U-C input pin 1 is connected with described supply voltage V1 to be detected; Described comparer U-C output pin 8 is connected with described resistance R6 ' one end, and the other end is connected with described diode cathode end; The negative pole end ground connection of described diode.
Also it should be noted that above-described resistance R1 ', resistance R2 ', for adjusting the voltage setting value of described comparer end of oppisite phase, select high-precision resistance.
Based on above embodiment, when described supply voltage input detection branch comprises three-way power voltage input detection branch, as shown in Figure 3, the another kind of voltage stabilization provided for the embodiment of the present invention outputs signal testing circuit;
Described supply voltage input detection branch comprises: resistance R1, resistance R2, resistance R3, resistance R4; The described branch road that compares comprises: comparer U1-A, comparer U1-B, comparer U1-C; Described output branch road comprises: resistance R5, resistance R6, resistance R7, resistance R8, switching tube Q1, switching tube Q2, diode;
Described resistance R1 mono-termination power VBAT, the other end respectively with described resistance R2 one end, described comparer U1-A input pin 2 is connected; Described comparer U1-A input pin 3 meets described supply voltage V1 to be detected; Described comparer U1-A output pin 1 is connected with described resistance R7 one end; The C end of switching tube Q1 described in described another termination of resistance R7;
The described resistance R2 other end respectively with described resistance R3 one end, described comparer U1-B input pin 6 is connected; Described comparer U1-B input pin 5 meets described supply voltage V2 to be detected; Described comparer U1-B output pin 7 is connected with described resistance R8 one end, the B end of switching tube Q1 described in described another termination of resistance R8;
The described resistance R3 other end respectively with described resistance R4 one end, described comparer U1-C input pin 9 is connected; Described comparer U1-C input pin 10 meets described supply voltage V3 to be detected; Described comparer U1-C output pin 8 is connected with described resistance R6 one end; The positive terminal of diode described in described another termination of resistance R6;
Described resistance R4 other end ground connection;
The C end of switching tube Q2 described in the negative pole termination of described diode, the E of described switching tube Q2 holds ground connection; The B end of described switching tube Q2 connects one end of described resistance R5 respectively, the E end of described switching tube Q1; Described resistance R5 other end ground connection.
It should be noted that, described switching tube Q1 is triode or metal-oxide-semiconductor; Described switching tube Q2 is triode or metal-oxide-semiconductor.
Also it should be noted that, above-described resistance R1, R2, R3, R4, for adjusting the voltage setting value of the above comparer end of oppisite phase, selecting high-precision resistance;
Above-described comparer U1-A, U1-B, U1-C can adopt three unit of an amplifier; Or other comparator device.
Described resistance R6 is used for the current-limiting resistance of diode (LED), can adjust according to the needs of intrinsic brilliance;
Described switching tube Q1, Q2 can adopt NPN triode, or metal-oxide-semiconductor, or its switching device;
Described resistance R5, R7 are used for after described switching tube Q1 conducting, ensure that the dividing potential drop on resistance R7 is greater than 0.7V, i.e. minimum pressure drop between the turn-on base B of triode and emitter E.
After described resistance R8 is used for Q1 conducting, avoiding the base current of Q1 excessive, is current-limiting resistance.
Be example based on above three supply voltages to be detected, be described in detail as follows to the principle of work of its circuit: after the system boot of described three supply voltages to be detected, described three power module LDO are enabled, then output voltage V1, V2, V3, the output voltage of each LDO is with corresponding setting value V1_SET, V2_SET, V3_SET compares, such as V1 and its setting value V1_SET are in the homophase of the comparer selected and anti-phase minimum movements pressure differential range, and ensure once be greater than this value, the output of amplifier just becomes high level; It is little that described minimum movements pressure reduction will be tried one's best, V1_SET is tried one's best close to V1, ensure the stability of output supply voltage; Only have when V1 is greater than V1_SET time, think to export and stablize, reach setting value, then corresponding comparator unit U1-A exports high level.The motion flow of V2, V3 is identical, and the voltage only having corresponding LDO to export is all higher than the value V2_SET of setting, and during V3_SET, corresponding comparer exports high level, diode (LED) could be lighted.Therefore, just can judge when diode (LED) is lighted, the voltage of present each power module is all stablized, and can start normal operation.
Also it should be noted that, diode herein can also adopt the mode of language or display to point out, and does not limit to the mode lighted with diode (LED).
As shown in Figure 4, be a kind of electric equipment that the embodiment of the present invention provides, this electric equipment comprises: supply voltage stable output signal testing circuit; Described supply voltage stable output signal testing circuit comprises: at least one road supply voltage input detection branch, compares branch road and exports branch road;
Described supply voltage input detection branch, for receiving supply voltage to be detected and the default supply voltage value corresponding with it;
Describedly compare branch road, for the supply voltage described to be detected that receives described in relatively and the default supply voltage value corresponding with it, export comparative result;
Described output branch road, according to described comparative result, sends described cue.
It should be noted that, described default supply voltage value, according to described supply voltage to be detected, adopts high precision regulating resistor series connection dividing potential drop to realize.
Preferably, when described supply voltage input detection branch comprises a road supply voltage input detection branch; Described supply voltage input detection branch comprises: resistance R1 ', resistance R2 '; The described branch road that compares comprises: comparer U-C; Described output branch road comprises: resistance R6 ', diode;
Described resistance R1 ' one end is connected with described power supply VBAT; The other end respectively with described resistance R2 ' one end, described comparer U-C input pin 2 is connected; Described resistance R2 ' other end ground connection; Described comparer U-C input pin 1 is connected with described supply voltage V1 to be detected; Described comparer U-C output pin 8 is connected with described resistance R6 ' one end, and the other end is connected with described diode cathode end; The negative pole end ground connection of described diode.
Preferably, when described supply voltage input detection branch comprises three-way power voltage input detection branch; Described supply voltage input detection branch comprises: resistance R1, resistance R2, resistance R3, resistance R4; The described branch road that compares comprises: comparer U1-A, comparer U1-B, comparer U1-C; Described output branch road comprises: resistance R5, resistance R6, resistance R7, resistance R8, switching tube Q1, switching tube Q2, diode;
Described resistance R1 mono-termination power VBAT, the other end respectively with described resistance R2 one end, described comparer U1-A input pin 2 is connected; Described comparer U1-A input pin 3 meets described supply voltage V1 to be detected; Described comparer U1-A output pin 1 is connected with described resistance R7 one end; The C end of switching tube Q1 described in described another termination of resistance R7;
The described resistance R2 other end respectively with described resistance R3 one end, described comparer U1-B input pin 6 is connected; Described comparer U1-B input pin 5 meets described supply voltage V2 to be detected; Described comparer U1-B output pin 7 is connected with described resistance R8 one end, the B end of switching tube Q1 described in described another termination of resistance R8;
The described resistance R3 other end respectively with described resistance R4 one end, described comparer U1-C input pin 9 is connected; Described comparer U1-C input pin 10 meets described supply voltage V3 to be detected; Described comparer U1-C output pin 8 is connected with described resistance R6 one end; The positive terminal of diode described in described another termination of resistance R6;
Described resistance R4 other end ground connection;
The C end of switching tube Q2 described in the negative pole termination of described diode, the E of described switching tube Q2 holds ground connection; The B end of described switching tube Q2 connects one end of described resistance R5 respectively, the E end of described switching tube Q1; Described resistance R5 other end ground connection.
The above switching tube Q1 is triode or metal-oxide-semiconductor; Described switching tube Q2 is triode or metal-oxide-semiconductor.
Technical scheme of the present invention is by more described supply voltage to be detected and the default supply voltage value corresponding with it; Judge whether supply voltage to be detected reaches the energy supply demand of modules in electronic equipment, thus whole system can be pointed out whether to run next step operation, thus reduce the irregular operating probability of whole product or equipment.Meanwhile, the reason of system irregular operating can also indirectly be indicated.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.
Claims (10)
1. a supply voltage stable output signal testing circuit, is characterized in that, comprising: at least one road supply voltage input detection branch, compares branch road and exports branch road;
Described supply voltage input detection branch, for receiving supply voltage to be detected and the default supply voltage value corresponding with it;
Describedly compare branch road, for the supply voltage described to be detected that receives described in relatively and the default supply voltage value corresponding with it, export comparative result;
Described output branch road, according to described comparative result, sends described cue.
2. supply voltage according to claim 1 stable output signal testing circuit, is characterized in that, described default supply voltage value, according to described supply voltage to be detected, adopts high precision regulating resistor series connection dividing potential drop to realize.
3. supply voltage according to claim 1 and 2 stable output signal testing circuit, is characterized in that, when described supply voltage input detection branch comprises a road supply voltage input detection branch; Described supply voltage input detection branch comprises: resistance R1 ', resistance R2 '; The described branch road that compares comprises: comparer U-C; Described output branch road comprises: resistance R6 ', diode;
Described resistance R1 ' one end is connected with described power supply VBAT; The other end respectively with described resistance R2 ' one end, described comparer U-C input pin 2 is connected; Described resistance R2 ' other end ground connection; Described comparer U-C input pin 1 is connected with described supply voltage V1 to be detected; Described comparer U-C output pin 8 is connected with described resistance R6 ' one end, and the other end is connected with described diode cathode end; The negative pole end ground connection of described diode.
4. supply voltage according to claim 1 and 2 stable output signal testing circuit, is characterized in that, when described supply voltage input detection branch comprises three-way power voltage input detection branch; Described supply voltage input detection branch comprises: resistance R1, resistance R2, resistance R3, resistance R4; The described branch road that compares comprises: comparer U1-A, comparer U1-B, comparer U1-C; Described output branch road comprises: resistance R5, resistance R6, resistance R7, resistance R8, switching tube Q1, switching tube Q2, diode;
Described resistance R1 mono-termination power VBAT, the other end respectively with described resistance R2 one end, described comparer U1-A input pin 2 is connected; Described comparer U1-A input pin 3 meets described supply voltage V1 to be detected; Described comparer U1-A output pin 1 is connected with described resistance R7 one end; The C end of switching tube Q1 described in described another termination of resistance R7;
The described resistance R2 other end respectively with described resistance R3 one end, described comparer U1-B input pin 6 is connected; Described comparer U1-B input pin 5 meets described supply voltage V2 to be detected; Described comparer U1-B output pin 7 is connected with described resistance R8 one end, the B end of switching tube Q1 described in described another termination of resistance R8;
The described resistance R3 other end respectively with described resistance R4 one end, described comparer U1-C input pin 9 is connected; Described comparer U1-C input pin 10 meets described supply voltage V3 to be detected; Described comparer U1-C output pin 8 is connected with described resistance R6 one end; The positive terminal of diode described in described another termination of resistance R6;
Described resistance R4 other end ground connection;
The C end of switching tube Q2 described in the negative pole termination of described diode, the E of described switching tube Q2 holds ground connection; The B end of described switching tube Q2 connects one end of described resistance R5 respectively, the E end of described switching tube Q1; Described resistance R5 other end ground connection.
5. supply voltage according to claim 4 stable output signal testing circuit, it is characterized in that, described switching tube Q1 is triode or metal-oxide-semiconductor; Described switching tube Q2 is triode or metal-oxide-semiconductor.
6. an electric equipment, is characterized in that, comprising: supply voltage stable output signal testing circuit; Described supply voltage stable output signal testing circuit comprises: at least one road supply voltage input detection branch, compares branch road and exports branch road;
Described supply voltage input detection branch, for receiving supply voltage to be detected and the default supply voltage value corresponding with it;
Describedly compare branch road, for the supply voltage described to be detected that receives described in relatively and the default supply voltage value corresponding with it, export comparative result;
Described output branch road, according to described comparative result, sends described cue.
7. electric equipment according to claim 6, is characterized in that, described default supply voltage value, according to described supply voltage to be detected, adopts high precision regulating resistor series connection dividing potential drop to realize.
8. the electric equipment according to claim 6 or 7, is characterized in that, when described supply voltage input detection branch comprises a road supply voltage input detection branch; Described supply voltage input detection branch comprises: resistance R1 ', resistance R2 '; The described branch road that compares comprises: comparer U-C; Described output branch road comprises: resistance R6 ', diode;
Described resistance R1 ' one end is connected with described power supply VBAT; The other end respectively with described resistance R2 ' one end, described comparer U-C input pin 2 is connected; Described resistance R2 ' other end ground connection; Described comparer U-C input pin 1 is connected with described supply voltage V1 to be detected; Described comparer U-C output pin 8 is connected with described resistance R6 ' one end, and the other end is connected with described diode cathode end; The negative pole end ground connection of described diode.
9. the electric equipment according to claim 6 or 7, is characterized in that, when described supply voltage input detection branch comprises three-way power voltage input detection branch; Described supply voltage input detection branch comprises: resistance R1, resistance R2, resistance R3, resistance R4; The described branch road that compares comprises: comparer U1-A, comparer U1-B, comparer U1-C; Described output branch road comprises: resistance R5, resistance R6, resistance R7, resistance R8, switching tube Q1, switching tube Q2, diode;
Described resistance R1 mono-termination power VBAT, the other end respectively with described resistance R2 one end, described comparer U1-A input pin 2 is connected; Described comparer U1-A input pin 3 meets described supply voltage V1 to be detected; Described comparer U1-A output pin 1 is connected with described resistance R7 one end; The C end of switching tube Q1 described in described another termination of resistance R7;
The described resistance R2 other end respectively with described resistance R3 one end, described comparer U1-B input pin 6 is connected; Described comparer U1-B input pin 5 meets described supply voltage V2 to be detected; Described comparer U1-B output pin 7 is connected with described resistance R8 one end, the B end of switching tube Q1 described in described another termination of resistance R8;
The described resistance R3 other end respectively with described resistance R4 one end, described comparer U1-C input pin 9 is connected; Described comparer U1-C input pin 10 meets described supply voltage V3 to be detected; Described comparer U1-C output pin 8 is connected with described resistance R6 one end; The positive terminal of diode described in described another termination of resistance R6;
Described resistance R4 other end ground connection;
The C end of switching tube Q2 described in the negative pole termination of described diode, the E of described switching tube Q2 holds ground connection; The B end of described switching tube Q2 connects one end of described resistance R5 respectively, the E end of described switching tube Q1; Described resistance R5 other end ground connection.
10. electric equipment according to claim 9, is characterized in that, described switching tube Q1 is triode or metal-oxide-semiconductor; Described switching tube Q2 is triode or metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410805334.6A CN104569562A (en) | 2014-12-19 | 2014-12-19 | Supply voltage stable output signal detection circuit and electric equipment applying same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410805334.6A CN104569562A (en) | 2014-12-19 | 2014-12-19 | Supply voltage stable output signal detection circuit and electric equipment applying same |
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| CN104569562A true CN104569562A (en) | 2015-04-29 |
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| CN201410805334.6A Pending CN104569562A (en) | 2014-12-19 | 2014-12-19 | Supply voltage stable output signal detection circuit and electric equipment applying same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107436615A (en) * | 2016-05-26 | 2017-12-05 | 中芯国际集成电路制造(上海)有限公司 | System for detecting supply voltage |
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2014
- 2014-12-19 CN CN201410805334.6A patent/CN104569562A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107436615A (en) * | 2016-05-26 | 2017-12-05 | 中芯国际集成电路制造(上海)有限公司 | System for detecting supply voltage |
| CN107436615B (en) * | 2016-05-26 | 2019-01-22 | 中芯国际集成电路制造(上海)有限公司 | System for detecting supply voltage |
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Application publication date: 20150429 |