CN209858635U - Computer power supply voltage detection circuit - Google Patents
Computer power supply voltage detection circuit Download PDFInfo
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- CN209858635U CN209858635U CN201920457668.7U CN201920457668U CN209858635U CN 209858635 U CN209858635 U CN 209858635U CN 201920457668 U CN201920457668 U CN 201920457668U CN 209858635 U CN209858635 U CN 209858635U
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- digital potentiometer
- inverting input
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- 238000001514 detection method Methods 0.000 title claims abstract description 35
- 239000003990 capacitor Substances 0.000 claims abstract description 27
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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Abstract
The utility model discloses a computer power supply voltage detection circuit, belonging to the technical field of voltage detection, wherein the power supply voltage detection circuit comprises a voltage acquisition circuit, an amplifying circuit and an output circuit; the voltage acquisition circuit comprises an amplifier U1, wherein the non-inverting input end of the amplifier U1 is connected to a voltage signal, the non-inverting input end of the amplifier U1 is further connected to the parallel ground of a resistor R1 and a capacitor C1, the inverting input end of the amplifier U1 is connected to the output end of the amplifier U1, and the output end of the amplifier U1 is connected to the amplifying circuit through a resistor R2; the amplifying circuit comprises a digital potentiometer U4, an amplifier U2, and the output circuit comprises an amplifier U3; the utility model discloses a digital potentiometer cooperation amplifier's scheme has guaranteed the stability and the reliability of whole detection circuitry work.
Description
Technical Field
The utility model belongs to the technical field of voltage detection, concretely relates to computer power supply voltage detection circuitry.
Background
With the development of science and technology, electronic technology is rapidly developed, the variety of electronic products is more and more abundant, and various electronic products enter the lives of common people, so that the daily life of people can not be separated from the electronic products. Most electronic products need to be externally connected with mains supply, so that a power supply is needed.
Electronic equipment or an integrated circuit system can normally work only by a power supply, the power supply of the system is often unstable, and when the voltage of the power supply is reduced to a certain value, a circuit can not normally work or is in an unstable state. The power supply voltage detection circuit detects the power supply voltage, when the power supply voltage is reduced to be lower than the threshold voltage of normal operation, the detection logic falling edge jump is given, and the electronic equipment or the circuit system enables the circuit to enter a corresponding working state according to the logic jump.
The popularization of the current computer causes the life of common people to be greatly facilitated, and no matter the computer is a notebook computer or a desktop computer, the power supply needs to be accessed, but the computer belongs to a precise integrated circuit product, the requirement on the power supply is very strict, and the current voltage detection technology has higher precision, but is easily influenced by factors such as environment, wire length and the like, so that the precision of measurement is reduced, and therefore a new power supply voltage detection circuit needs to be provided.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a computer power supply voltage detection circuit realizes improving the purpose of computer voltage measurement accuracy, guarantees whole detection circuitry's stability and reliability simultaneously.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a computer power supply voltage detection circuit comprises a voltage acquisition circuit, an amplification circuit and an output circuit;
the voltage acquisition circuit comprises an amplifier U1, wherein the non-inverting input end of the amplifier U1 is connected to a voltage signal, the non-inverting input end of the amplifier U1 is further connected to the parallel ground of a resistor R1 and a capacitor C1, the inverting input end of the amplifier U1 is connected to the output end of the amplifier U1, and the output end of the amplifier U1 is connected to the amplifying circuit through a resistor R2;
the amplifying circuit comprises a digital potentiometer U4, an amplifier U2, and the output circuit comprises an amplifier U3;
a pin 1 of the digital potentiometer U4 is connected to the output end of the amplifier U1 through the resistor R2, a pin 10 of the digital potentiometer U4 is connected to the inverting input end of the amplifier U2, the non-inverting input end of the amplifier U2 is grounded, the output end of the amplifier U2 is connected to the inverting input end of the amplifier U3 through the series connection of the resistors R4 and R6, the non-inverting input end of the amplifier U3 is grounded, one end of the resistor R5 is connected to a negative power supply VCC, and the other end of the resistor R4 is connected between the resistors R6 and R4;
the inverting input terminal of the amplifier U3 is connected to the output terminal of the amplifier U3 through the series connection of a resistor R7 and a resistor R8, and the output terminal of the amplifier U3 serves as the output terminal of the whole circuit.
Optionally, the amplifying circuit further comprises a digital potentiometer U5;
the 1 pin of the digital potentiometer U5 is connected to the inverting input terminal of the amplifier U2 through a resistor R3, and the 10 pin of the digital potentiometer U5 is connected to the output terminal of the amplifier U2.
Optionally, the power supply voltage detection circuit further includes a power supply circuit, and the power supply circuit includes a positive power supply + VCC, resistors R9, R10, and capacitors C2-C9;
the positive power supply + VCC is respectively connected to the pins 9 of the digital potentiometer U4 and the digital potentiometer U5 through a resistor R9, and two ends of the resistor R9 are respectively grounded through the parallel connection of a capacitor C2, a capacitor C3, a capacitor C4 and a capacitor C5;
the negative power supply-VCC is respectively connected to the 3 pins of the digital potentiometer U4 and the digital potentiometer U5 through a resistor R10, and two ends of the resistor R10 are respectively grounded through parallel connection of a capacitor C6, a capacitor C7, a capacitor C8 and a capacitor C9.
Optionally, the digital potentiometer U4 and the digital potentiometer U5 are both AD5290 type digital potentiometers.
Optionally, the amplifier U1, the amplifier U2 and the amplifier U3 are all LM358 type amplifiers.
The beneficial effects of the utility model reside in that:
the utility model discloses a technical scheme has redesigned the mains voltage detection circuit of computer and has simple structure, is difficult to receive the influence of surrounding environment, and measurement accuracy is high has a little, still has anti-jamming ability simultaneously, the utility model discloses a voltage detection circuit adopts the scheme of digital potentiometer cooperation amplifier to guarantee the stability and the reliability of whole detection circuitry work.
Drawings
In order to make the purpose, technical scheme and beneficial effect of the utility model clearer, the utility model provides a following figure explains:
fig. 1 is a circuit diagram of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in FIG. 1, the utility model provides a computer power voltage detection circuit, power voltage detection circuit contains voltage acquisition circuit, amplifier circuit and output circuit.
The voltage acquisition circuit comprises an amplifier U1, wherein the non-inverting input end of the amplifier U1 is connected to a voltage signal, the non-inverting input end of the amplifier U1 is further grounded through the parallel connection of a resistor R1 and a capacitor C1, the inverting input end of the amplifier U1 is connected to the output end of the amplifier U1, and the output end of the amplifier U1 is connected to the amplifying circuit through the resistor R2.
The amplifying circuit comprises a digital potentiometer U4, an amplifier U2, and the output circuit comprises an amplifier U3; in this embodiment, for accurate measurement of the power supply voltage, the scheme of selecting the digital potentiometer is adopted, and compared with the conventional mechanical potentiometer, the digital potentiometer has the advantages of programmable change of the effective electrical angle and the output range, vibration resistance, low noise, long service life and the like, so that the digital potentiometer is very suitable for being used in the current small and beautiful detection scheme, and meanwhile, the service life of the whole detection circuit can be prolonged.
The 1 pin of the digital potentiometer U4 is connected to the output end of the amplifier U1 through the resistor R2, the 10 pin of the digital potentiometer U4 is connected to the reverse input end of the amplifier U2, the non-inverting input end of the amplifier U2 is grounded, the output end of the amplifier U2 is connected to the reverse input end of the amplifier U3 through the series connection of the resistors R4 and R6, the non-inverting input end of the amplifier U3 is grounded, one end of the resistor R5 is connected to a negative power supply VCC, and the other end of the resistor R4 is connected between the resistors R6 and R4.
The inverting input terminal of the amplifier U3 is connected to the output terminal of the amplifier U3 through the series connection of a resistor R7 and a resistor R8, and the output terminal of the amplifier U3 serves as the output terminal of the whole circuit.
Optionally, the amplifying circuit further comprises a digital potentiometer U5;
the 1 pin of the digital potentiometer U5 is connected to the inverting input terminal of the amplifier U2 through a resistor R3, and the 10 pin of the digital potentiometer U5 is connected to the output terminal of the amplifier U2.
In this embodiment, the digital potentiometer U5 is further selected, so that not only the detection range of the whole power voltage is improved, but also the whole detection precision can be improved.
Optionally, the power supply voltage detection circuit further includes a power supply circuit, and the power supply circuit includes a positive power supply + VCC, resistors R9, R10, and capacitors C2-C9;
the positive power supply + VCC is respectively connected to the pins 9 of the digital potentiometer U4 and the digital potentiometer U5 through a resistor R9, and two ends of the resistor R9 are respectively grounded through the parallel connection of a capacitor C2, a capacitor C3, a capacitor C4 and a capacitor C5;
negative power supply-VCC passes through resistance R10 and is connected to respectively digital potentiometer U4 digital potentiometer U5's 3 feet, the both ends of resistance R10 are respectively through electric capacity C6, electric capacity C7 and electric capacity C8, electric capacity C9's parallelly connected ground, wherein at resistance R9, R10's left and right sides both ends parallel capacitance realized the flat wave to detection circuitry self mains voltage, also can filter the part simultaneously and come from the detection circuitry outside the current interference to guarantee measuring precision.
Optionally, the digital potentiometer U4 and the digital potentiometer U5 both use an AD5290 type digital potentiometer, and may also use a MAX5438 type digital potentiometer, and specifically, an optimal scheme may be selected after balancing the accuracy requirement and the design cost.
Optionally, the amplifier U1, the amplifier U2, and the amplifier U3 are all LM358 type amplifiers, which are commonly used amplifiers, and are easy to obtain and low in cost, and the amplifiers U1-U3 may also be AD8202 type amplifiers, which are high-speed operational amplifiers, but the relative cost is increased, and they may be adjusted according to actual requirements.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (5)
1. A computer power supply voltage detection circuit characterized by: the power supply voltage detection circuit comprises a voltage acquisition circuit, an amplification circuit and an output circuit;
the voltage acquisition circuit comprises an amplifier U1, wherein the non-inverting input end of the amplifier U1 is connected to a voltage signal, the non-inverting input end of the amplifier U1 is further connected to the parallel ground of a resistor R1 and a capacitor C1, the inverting input end of the amplifier U1 is connected to the output end of the amplifier U1, and the output end of the amplifier U1 is connected to the amplifying circuit through a resistor R2;
the amplifying circuit comprises a digital potentiometer U4, an amplifier U2, and the output circuit comprises an amplifier U3;
a pin 1 of the digital potentiometer U4 is connected to the output end of the amplifier U1 through the resistor R2, a pin 10 of the digital potentiometer U4 is connected to the inverting input end of the amplifier U2, the non-inverting input end of the amplifier U2 is grounded, the output end of the amplifier U2 is connected to the inverting input end of the amplifier U3 through the series connection of the resistors R4 and R6, the non-inverting input end of the amplifier U3 is grounded, one end of the resistor R5 is connected to a negative power supply VCC, and the other end of the resistor R4 is connected between the resistors R6 and R4;
the inverting input terminal of the amplifier U3 is connected to the output terminal of the amplifier U3 through the series connection of a resistor R7 and a resistor R8, and the output terminal of the amplifier U3 serves as the output terminal of the whole circuit.
2. The computer power supply voltage detection circuit according to claim 1, wherein: the amplifying circuit also comprises a digital potentiometer U5;
the 1 pin of the digital potentiometer U5 is connected to the inverting input terminal of the amplifier U2 through a resistor R3, and the 10 pin of the digital potentiometer U5 is connected to the output terminal of the amplifier U2.
3. The computer power supply voltage detection circuit according to claim 2, wherein: the supply voltage detection circuit also comprises a power supply circuit, wherein the power supply circuit comprises a positive power supply + VCC, resistors R9 and R10, and capacitors C2-C9;
the positive power supply + VCC is respectively connected to the pins 9 of the digital potentiometer U4 and the digital potentiometer U5 through a resistor R9, and two ends of the resistor R9 are respectively grounded through the parallel connection of a capacitor C2, a capacitor C3, a capacitor C4 and a capacitor C5;
the negative power supply-VCC is respectively connected to the 3 pins of the digital potentiometer U4 and the digital potentiometer U5 through a resistor R10, and two ends of the resistor R10 are respectively grounded through parallel connection of a capacitor C6, a capacitor C7, a capacitor C8 and a capacitor C9.
4. The computer power supply voltage detection circuit according to claim 2, wherein: the digital potentiometer U4 and the digital potentiometer U5 are AD5290 type digital potentiometers.
5. The computer power supply voltage detection circuit according to claim 2, wherein: the amplifier U1, the amplifier U2 and the amplifier U3 are all LM358 type amplifiers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920457668.7U CN209858635U (en) | 2019-04-04 | 2019-04-04 | Computer power supply voltage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920457668.7U CN209858635U (en) | 2019-04-04 | 2019-04-04 | Computer power supply voltage detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209858635U true CN209858635U (en) | 2019-12-27 |
Family
ID=68936463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920457668.7U Active CN209858635U (en) | 2019-04-04 | 2019-04-04 | Computer power supply voltage detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209858635U (en) |
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2019
- 2019-04-04 CN CN201920457668.7U patent/CN209858635U/en active Active
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