CN204405727U - A kind ofly inputted/the circuit of under-voltage detection for electronic equipment - Google Patents
A kind ofly inputted/the circuit of under-voltage detection for electronic equipment Download PDFInfo
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- CN204405727U CN204405727U CN201420846501.7U CN201420846501U CN204405727U CN 204405727 U CN204405727 U CN 204405727U CN 201420846501 U CN201420846501 U CN 201420846501U CN 204405727 U CN204405727 U CN 204405727U
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Abstract
The utility model relates to technical field of electronic equipment, particularly relates to a kind ofly to input/the circuit of under-voltage detection for electronic equipment.It comprises input sampling circuit, the first reference source, the second reference source, the first logical operation circuit, the second logical operation circuit, OR circuit and level shifting circuit.The output terminal of input sampling circuit is connected with the input end of the first logical operation circuit and the second logical operation circuit respectively, the output terminal of the first reference source is connected with the input end of the first logical operation circuit respectively with the output terminal of the second reference source, and the first logical operation circuit is connected with level shifting circuit by OR circuit with the output terminal of the second logical operation circuit.After input signal is gathered voltage division processing by circuit of sampling input by this circuit, to compare through computing comparer with reference source and export level shifting circuit to by OR circuit again, level shifting circuit converts this signal to high and low level, thus the input overvoltage of judgment device/under-voltage situation.
Description
Technical field
The utility model relates to technical field of electronic equipment, particularly relates to a kind ofly to input/the circuit of under-voltage detection for electronic equipment.
Background technology
In hyundai electronics science and technology especially modern high frequency field of switch power, people get more and more to the functional requirement of equipment, and by high frequency switch power, index is no longer unique consider object, and subsidiary function is also taken seriously increasingly; Such as inputted/under-voltage protection function; equipment in the past; people may ignore this function; when input voltage fluctuation amplitude is larger, equipment can not be protected, when input voltage is too high; the ultimate value even exceeding equipment and can bear may be reached; cause device damage, this not only can cause serious economic loss, the more important thing is the normal operation of the equipment of impact.
Utility model content
The purpose of this utility model is to provide a kind of and inputted/the circuit of under-voltage detection for electronic equipment.It can according to the demand of user, and the input over voltage protection point of set device, uses in conjunction with the supervisory circuit in electronic equipment, can the protection point of opertaing device accurately, thus better protects electronic equipment be not transfused to the fluctuation of voltage and damage.
Technical solution adopted in the utility model is: a kind ofly inputted/the circuit of under-voltage detection for electronic equipment, comprise input sampling circuit, first reference source, second reference source, first logical operation circuit, second logical operation circuit, OR circuit and level shifting circuit, the output terminal of described input sampling circuit is connected with the input end of the first logical operation circuit and the second logical operation circuit respectively, the output terminal of described first reference source is connected with the input end of the first logical operation circuit and the second logical operation circuit respectively with the output terminal of the second reference source, described first logical operation circuit is connected with level shifting circuit by OR circuit with the output terminal of the second logical operation circuit.
Further, described input sampling circuit comprises the resistance R1 ~ R7 connected successively, and the other end of described resistance R7 is connected with the input end of resistance R8 and the first logical operation circuit, and the two ends of described resistance R8 are connected in parallel to electric capacity C5, described resistance R8 ground connection.
Further, the first described logical operation circuit comprises the first comparer N3, triode V1 and the first photoelectrical coupler N4, the output terminal of described first reference source is connected with the inverting input of the first comparer N3, the normal phase input end of described first comparer N3 is connected with resistance R7, the output terminal of described first comparer N3 is connected with the base stage of triode V1, the emitter of described triode V1 is connected with the input end of the first photoelectrical coupler N4, and the output terminal of described first photoelectrical coupler N4 is connected with OR circuit.
Further, the second described logical operation circuit comprises the second comparer N6, triode V3 and the second photoelectrical coupler N5, the output terminal of described second reference source is connected with the inverting input of the second comparer N6, the normal phase input end of described second comparer N6 is connected with resistance R7, the output terminal of described second comparer N6 is connected with the base stage of triode V3, the emitter of described triode V3 is connected with the input end of the second photoelectrical coupler N5, and the output terminal of described second photoelectrical coupler N5 is connected with OR circuit.
Further, described first reference source comprises resistance R9, resistance R10, resistance R19, voltage stabilizer N1 and electric capacity C1, described resistance R9, resistance R10, resistance R19 are connected in series between the first power input and ground, the feedback end of described voltage stabilizer N1 is connected on R9, R19 tie point, negative electrode is connected on resistance R9, resistance 10 tie point, anode is connected on the ground of the first power supply, and described electric capacity C1 is connected across between the negative electrode and positive electrode of voltage stabilizer N1.
Further, described second reference source comprises resistance R11, resistance R12, resistance R22, voltage stabilizer N2 and electric capacity C2, described resistance R11, resistance R12, resistance R22 are connected in series between the first power input and ground, the feedback end of described voltage stabilizer N2 is connected on R12, R22 tie point, negative electrode is connected on resistance R11, resistance 12 tie point, anode is connected on the ground of the first power supply, and described electric capacity C2 is connected across between the negative electrode and positive electrode of voltage stabilizer N2.
Further, described OR circuit comprises diode V4 and V5 be connected in parallel, the positive pole of described diode V4 is connected with the output terminal of the first photoelectrical coupler N4, the positive pole of described diode V5 is connected with the output terminal of the second photoelectrical coupler N5, and the negative pole of described diode V4 with V5 is connected with level shifting circuit input end.
Further, described level shifting circuit comprises resistance R20, resistance R21 and triode V2, described resistance R20 is connected with the base stage of triode V2, described resistance R21 two ends are connected with the collector of second source input end and triode V2 respectively, the grounded emitter of described triode V2, the collector of described triode V2 is connected with level shifting circuit output terminal.
The beneficial effects of the utility model are: this circuit carries out voltage division processing by input sampling circuit by after input signal collection, the signal after voltage division processing and reference source are compared by computing comparer.When equipment input undervoltage, the first comparer exports high level, the second comparer output low level; When equipment input is normal, the first comparer output low level, the second comparer output low level; When equipment input overvoltage, the first comparer output low level, the second comparer exports high level, when any one comparer exports high level, level shifting circuit output low level; During the equal output low level of two comparers, level shifting circuit exports high level.High and low level can be delivered to monitoring unit by level shifting circuit, and monitoring unit is according to the shutoff of the input overvoltage/under-voltage situation opertaing device of equipment, thus proterctive equipment is not damaged.And the output voltage of two reference sources can regulate according to the difference of resistance; make this circuit input overvoltage/under-voltage protection point can come as required arbitrarily to change; thus make circuit detect input signal more flexibly, and the status information that external output detections arrives.
Accompanying drawing explanation
Fig. 1 is the utility model theory diagram;
Fig. 2 is the circuit diagram of the utility model input sampling circuit;
Fig. 3 is the utility model first reference source circuit figure;
Fig. 4 is the utility model second reference source circuit figure;
Fig. 5 is the circuit connection diagram of the utility model logical operation circuit to level shifting circuit;
In figure: 1-circuit of sampling input, the 2-the first reference source, the 3-the second reference source, the 4-the first logical operation circuit, the 5-the second logical operation circuit, 6-OR circuit, 7-level shifting circuit.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with accompanying drawing and example, the utility model is further elaborated.Instantiation described herein only in order to explain the utility model, and is not used in restriction the utility model.In addition, if below in described each embodiment of the utility model involved technical characteristic do not form conflict each other and just can mutually combine.
As shown in Figure 1, this circuit comprises input sampling circuit 1, first reference source 2, second reference source 3, first logical operation circuit 4, second logical operation circuit 5, OR circuit 6 and level shifting circuit 7, the output terminal of input sampling circuit 1 is connected with the input end of the first logical operation circuit 4 and the second logical operation circuit 5 respectively, the output terminal of the first reference source 2 is connected with the input end of the first logical operation circuit 4 respectively with the output terminal of the second reference source 3, first logical operation circuit 4 is connected with level shifting circuit 7 by OR circuit 6 with the output terminal of the second logical operation circuit 5.
The principle of this circuit is: carry out voltage division processing by input sampling circuit 1 by after input signal collection, the signal after voltage division processing and the first reference source 2 and the second reference source 3 is compared by logical operation circuit.When equipment input undervoltage, the first logical operation circuit 4 exports high level, the second logical operation circuit 5 output low level; When equipment input is normal, the first logical operation circuit 4 output low level, the second logical operation circuit output low level; When equipment input overvoltage, the first logical operation circuit 4 output low level, the second logical operation circuit exports high level, when any one logical operation circuit exports high level, level shifting circuit output low level; During the equal output low level of two logical operation circuits, level shifting circuit exports high level.High and low level can be delivered to monitoring unit by level shifting circuit, and monitoring unit is according to the shutoff of the input overvoltage/under-voltage situation opertaing device of equipment, thus proterctive equipment is not damaged.
As shown in Figure 2, input sampling circuit 1 comprises the resistance R1 ~ R7 connected successively, and the other end of resistance R7 is connected with the input end of resistance R8 and the first logical operation circuit, and the two ends of resistance R8 are connected in parallel to electric capacity C5, resistance R8 ground connection.
As shown in Figure 3, first reference source 2 comprises resistance R9, resistance R10, resistance R19, voltage stabilizer N1 and electric capacity C1, resistance R9, resistance R10, resistance R19 are connected in series in the first power supply (the present embodiment+12V1) between input end and ground, the feedback end of voltage stabilizer N1 is connected on R9, R19 tie point, negative electrode is connected on resistance R9, resistance 10 tie point, anode is connected on the ground of the first power supply, and electric capacity C1 is connected across between the negative electrode and positive electrode of voltage stabilizer N1.In this circuit, R9 is current-limiting resistance, and C1 is filter capacitor, plays smooth signal.The reference voltage V ref1=2.5 (1+R10/R19) that first reference source 2 exports, by the reference voltage V ref1 regulating the ratio of R10, R19 can control the first reference source 2.
Reference source 2 is made up of R11, R12, R22, N2, C2, the reference voltage of the Ratio control reference source of R12, R22, and R11 plays current limliting, and C2 is filter capacitor, plays smooth signal.
As shown in Figure 4, second reference source 3 comprises resistance R11, resistance R12, resistance R22, voltage stabilizing diode N2 and electric capacity C2, resistance R11, resistance R12, resistance R22 are connected in series between the first power input and ground, the feedback end of voltage stabilizer N2 is connected on R12, R22 tie point, negative electrode is connected on resistance R11, resistance 12 tie point, anode is connected on the ground of the first power supply, and described electric capacity C2 is connected across between the negative electrode and positive electrode of voltage stabilizer N2.In this circuit, R11 is current-limiting resistance, and C2 is filter capacitor, plays smooth signal.The reference voltage V ref2=2.5 (1+R12/R22) that second reference source 3 exports, by the reference voltage V ref2 regulating the ratio of R12, R22 can control the second reference source 3.
As shown in Figure 5, first logical operation circuit 2 comprises the first comparer N3, triode V1 and the first photoelectrical coupler N4, the output terminal of the first reference source 2 is connected with the inverting input of the first comparer N3, the normal phase input end of the first comparer N3 is connected with resistance R7, the 8th of first comparer N3 is connected with the first VDD-to-VSS respectively with the 4th pin, between the first VDD-to-VSS, be parallel with an electric capacity C3, the output terminal of the first comparer N3 is connected with the base stage of triode V1.The output terminal of the first comparer N3 is also connected with electric capacity C4, resistance R16 and resistance R17, resistance R16 and resistance R17 is connected in series between the first VDD-to-VSS, between the output terminal that electric capacity C4 is connected to the first comparer N3 and ground, the output terminal of the first comparer N3 is connected between resistance R16 and resistance R17.The collector of triode V1 is connected with the first power supply by resistance R16, and emitter is connected with the positive pole of light emitting diode in the first photoelectrical coupler N4, the minus earth of light emitting diode.In first photoelectrical coupler N4, the collector of triode is connected with second source (the present embodiment is+5V), and emitter is connected with resistance R29 and OR circuit, resistance R29 other end ground connection.
Second logical operation circuit 5 comprises the second comparer N6, triode V3 and the second photoelectrical coupler N5, the output terminal of the second reference source 3 is connected with the inverting input of the second comparer N6, the normal phase input end of the second comparer N6 is connected with resistance R7, the 8th of second comparer N6 is connected with the first VDD-to-VSS respectively with the 4th pin, between the first VDD-to-VSS, be parallel with an electric capacity C6, the output terminal of the second comparer N6 is connected with the base stage of triode V3.The output terminal of the second comparer N6 is also connected with electric capacity C7, resistance R26 and resistance R27, resistance R26 and resistance R27 is connected in series between the first VDD-to-VSS, between the output terminal that electric capacity C7 is connected to the second comparer N6 and ground, the output terminal of the second comparer N6 is connected between resistance R26 and resistance R27.The collector of triode V3 is connected with the first power supply by resistance R28, and emitter is connected with the positive pole of light emitting diode in the second photoelectrical coupler N5, the minus earth of light emitting diode.In second photoelectrical coupler N5, the collector of triode is connected with OR circuit, is connected, grounded emitter by resistance R30 with second source (the present embodiment is+5V) simultaneously.
OR circuit 6 comprises diode V4 and V5 be connected in parallel, the positive pole of diode V4 is connected with the emitter of triode in the first photoelectrical coupler N4, the positive pole of diode V5 is connected with the collector of triode in the second photoelectrical coupler N5, and the negative pole of diode V4 with V5 is connected with level shifting circuit 7 input end.
Level shifting circuit comprises resistance R20, resistance R21 and triode V2, resistance R20 is connected with the base stage of triode V2, resistance R21 two ends are connected with the collector of second source input end and triode V2 respectively, the grounded emitter of triode V2, the collector of triode V2 is connected with the output terminal of level shifting circuit.Resistance R20 is current-limiting resistance; the drive current of control V2; resistance R21 is equally also current-limiting resistance, and control the output current of output signal, triode V2 act as level translator; when the drive singal of V2 is high level; V2 converts thereof into low level output, and when the drive singal of V2 is low level, V2 converts thereof into the high level output of+5V in monitoring unit; monitoring unit is according to the shutoff of the input overvoltage/under-voltage situation opertaing device of equipment, thus proterctive equipment is not damaged.。
The above; be only embodiment of the present utility model, it should be pointed out that any those of ordinary skill in the art are in the technical scope disclosed by the utility model; the change that can expect easily or replacement, all should be encompassed within protection domain of the present utility model.
Claims (8)
1. one kind inputted the/circuit of under-voltage detection for electronic equipment, it is characterized in that: comprise input sampling circuit, first reference source, second reference source, first logical operation circuit, second logical operation circuit, OR circuit and level shifting circuit, the output terminal of described input sampling circuit is connected with the input end of the first logical operation circuit and the second logical operation circuit respectively, the output terminal of described first reference source is connected with the input end of the first logical operation circuit and the second logical operation circuit respectively with the output terminal of the second reference source, described first logical operation circuit is connected with level shifting circuit by OR circuit with the output terminal of the second logical operation circuit.
2. a kind ofly as claimed in claim 1 inputted/the circuit of under-voltage detection for electronic equipment, it is characterized in that: described input sampling circuit comprises the resistance R1 ~ R7 connected successively, the other end of described resistance R7 is connected with the input end of resistance R8 and the first logical operation circuit, the two ends of described resistance R8 are connected in parallel to electric capacity C5, described resistance R8 ground connection.
3. a kind ofly as claimed in claim 1 inputted/the circuit of under-voltage detection for electronic equipment, it is characterized in that: the first described logical operation circuit comprises the first comparer N3, triode V1 and the first photoelectrical coupler N4, the output terminal of described first reference source is connected with the inverting input of the first comparer N3, the normal phase input end of described first comparer N3 is connected with resistance R7, the output terminal of described first comparer N3 is connected with the base stage of triode V1, the emitter of described triode V1 is connected with the input end of the first photoelectrical coupler N4, the output terminal of described first photoelectrical coupler N4 is connected with OR circuit.
4. a kind ofly as claimed in claim 1 inputted/the circuit of under-voltage detection for electronic equipment, it is characterized in that: the second described logical operation circuit comprises the second comparer N6, triode V3 and the second photoelectrical coupler N5, the output terminal of described second reference source is connected with the inverting input of the second comparer N6, the normal phase input end of described second comparer N6 is connected with resistance R7, the output terminal of described second comparer N6 is connected with the base stage of triode V3, the emitter of described triode V3 is connected with the input end of the second photoelectrical coupler N5, the output terminal of described second photoelectrical coupler N5 is connected with OR circuit.
5. a kind ofly as claimed in claim 1 inputted/the circuit of under-voltage detection for electronic equipment, it is characterized in that: described first reference source comprises resistance R9, resistance R10, resistance R19, voltage stabilizer N1 and electric capacity C1, described resistance R9, resistance R10, resistance R19 are connected in series between the first power input and ground, the feedback end of described voltage stabilizer N1 is connected on R9, R19 tie point, negative electrode is connected on resistance R9, resistance 10 tie point, anode is connected on the ground of the first power supply, and described electric capacity C1 is connected across between the negative electrode and positive electrode of voltage stabilizer N1.
6. a kind ofly as claimed in claim 1 inputted/the circuit of under-voltage detection for electronic equipment, it is characterized in that: described second reference source comprises resistance R11, resistance R12, resistance R22, voltage stabilizer N2 and electric capacity C2, described resistance R11, resistance R12, resistance R22 are connected in series between the first power input and ground, the feedback end of described voltage stabilizer N2 is connected on R12, R22 tie point, negative electrode is connected on resistance R11, resistance 12 tie point, anode is connected on the ground of the first power supply, and described electric capacity C2 is connected across between the negative electrode and positive electrode of voltage stabilizer N2.
7. a kind ofly as claimed in claim 1 inputted/the circuit of under-voltage detection for electronic equipment, it is characterized in that: described OR circuit comprises diode V4 and V5 be connected in parallel, the positive pole of described diode V4 is connected with the output terminal of the first photoelectrical coupler N4, the positive pole of described diode V5 is connected with the output terminal of the second photoelectrical coupler N5, and the negative pole of described diode V4 with V5 is connected with level shifting circuit input end.
8. a kind ofly as claimed in claim 1 inputted/the circuit of under-voltage detection for electronic equipment, it is characterized in that: described level shifting circuit comprises resistance R20, resistance R21 and triode V2, described resistance R20 is connected with the base stage of triode V2, described resistance R21 two ends are connected with the collector of second source input end and triode V2 respectively, the grounded emitter of described triode V2, the collector of described triode V2 is connected with level shifting circuit output terminal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420846501.7U CN204405727U (en) | 2014-12-26 | 2014-12-26 | A kind ofly inputted/the circuit of under-voltage detection for electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420846501.7U CN204405727U (en) | 2014-12-26 | 2014-12-26 | A kind ofly inputted/the circuit of under-voltage detection for electronic equipment |
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| CN204405727U true CN204405727U (en) | 2015-06-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107294058A (en) * | 2017-06-27 | 2017-10-24 | 合肥尚硕新能源有限公司 | A kind of overvoltage undervoltage detection circuit applied to solar energy power accumulating power supply |
| CN108279387A (en) * | 2018-01-17 | 2018-07-13 | 北京和利时智能技术有限公司 | A kind of apparatus for monitoring power supply |
| CN109031038A (en) * | 2018-05-25 | 2018-12-18 | 烽火通信科技股份有限公司 | A kind of method and circuit for realizing power fail warning in PON far end system |
| CN109791174A (en) * | 2016-08-11 | 2019-05-21 | Lg伊诺特有限公司 | Circuit fault detector, electric vehicle charging controller and fault detection method including it |
| CN110456141A (en) * | 2019-08-28 | 2019-11-15 | 安徽贵博新能科技有限公司 | A kind of flash over-current detection circuit and its method |
| CN110596448A (en) * | 2019-09-25 | 2019-12-20 | 南京亚派科技股份有限公司 | Simple detection circuit for IO port drive level undervoltage |
| CN115776166A (en) * | 2023-02-13 | 2023-03-10 | 深圳市锐深科技有限公司 | Circuit and method for confirming connection between electric ship and charging gun and electric ship |
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2014
- 2014-12-26 CN CN201420846501.7U patent/CN204405727U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109791174A (en) * | 2016-08-11 | 2019-05-21 | Lg伊诺特有限公司 | Circuit fault detector, electric vehicle charging controller and fault detection method including it |
| CN107294058A (en) * | 2017-06-27 | 2017-10-24 | 合肥尚硕新能源有限公司 | A kind of overvoltage undervoltage detection circuit applied to solar energy power accumulating power supply |
| CN108279387A (en) * | 2018-01-17 | 2018-07-13 | 北京和利时智能技术有限公司 | A kind of apparatus for monitoring power supply |
| CN109031038A (en) * | 2018-05-25 | 2018-12-18 | 烽火通信科技股份有限公司 | A kind of method and circuit for realizing power fail warning in PON far end system |
| CN110456141A (en) * | 2019-08-28 | 2019-11-15 | 安徽贵博新能科技有限公司 | A kind of flash over-current detection circuit and its method |
| CN110596448A (en) * | 2019-09-25 | 2019-12-20 | 南京亚派科技股份有限公司 | Simple detection circuit for IO port drive level undervoltage |
| CN115776166A (en) * | 2023-02-13 | 2023-03-10 | 深圳市锐深科技有限公司 | Circuit and method for confirming connection between electric ship and charging gun and electric ship |
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