CN210074759U - Over-voltage and under-voltage protection module - Google Patents
Over-voltage and under-voltage protection module Download PDFInfo
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- CN210074759U CN210074759U CN201921346212.XU CN201921346212U CN210074759U CN 210074759 U CN210074759 U CN 210074759U CN 201921346212 U CN201921346212 U CN 201921346212U CN 210074759 U CN210074759 U CN 210074759U
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Abstract
The utility model discloses a cross undervoltage protection module, including accurate adjustable linear voltage regulator U13, resistance R62, voltage comparator U12A and voltage comparator U12B, input voltage BUS is connected to resistance R62 one end, resistance R62 other end connecting resistance R63, voltage comparator U12A homophase end and resistance R65 are connected respectively to the resistance R63 other end, ground resistance R64 and resistance J5 are connected respectively to the resistance R65 other end, voltage comparator U12B inverting terminal is connected to the resistance J5 other end, voltage comparator U12B homophase end connecting resistance R71 respectively, voltage comparator U12A inverting terminal, accurate adjustable linear voltage regulator U13's K utmost point and R utmost point, accurate adjustable linear voltage regulator U13's A utmost point ground connection, voltage comparator U12A and power supply terminal 4 are connected respectively to the resistance R71 other end, voltage comparator U12 VCC 12A earthing terminal. The utility model discloses only with divider resistance all the way, can adjust the undervoltage threshold value simultaneously through adjusting resistance R65's resistance, reduced the use of resistance, saved the consumption.
Description
Technical Field
The utility model relates to a voltage detection field specifically is an cross undervoltage protection module.
Background
With the popularization of the existing electrical equipment, revolutionary changes are brought to industrial and agricultural production, national defense industry and science and technology, the social development is accelerated, people step into the electrification era, the quality of life of people is greatly improved, and the electrical equipment is more and more unavailable. With the development of science and technology, the precision of electrical equipment is gradually improved, and the change of covering the ground over the sky occurs, but how to protect the electrical equipment from the external interference becomes a main problem concerned by the development of the science and technology at present. At present, the power grid of China is popularized, and a huge power grid system provides much convenience for people. However, as the number of users accessing the power grid increases and the electrical appliances of the users are diversified, the voltage of the power grid is unstable, and the voltage which is suddenly high or low also becomes a main factor for damaging electrical equipment.
At present, many power supplies do not have overvoltage and undervoltage protection, and the full-load operation can cause the damage of a chip or an MOS (metal oxide semiconductor) tube when inputting low voltage or overvoltage.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a cross undervoltage protection module to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
an overvoltage and undervoltage protection module comprises a precision adjustable linear voltage regulator U13, a resistor R62, a voltage comparator U12A and a voltage comparator U12B, wherein one end of the resistor R62 is connected with an input voltage BUS, the other end of the resistor R62 is connected with a resistor R63, the other end of the resistor R63 is connected with a homophase end of the voltage comparator U12A and a resistor R65, the other end of the resistor R65 is connected with a grounding resistor R64 and a resistor J5, the other end of the resistor J5 is connected with an inversion end of the voltage comparator U12B, the homophase end of the voltage comparator U12B is connected with a resistor R71, the inversion end of the voltage comparator U12 42, a K pole and an R pole of the precision adjustable linear voltage regulator U13, an A pole of the precision adjustable linear voltage regulator U13 is grounded, the other end of the resistor R71 is connected with a power supply terminal U12A and a power supply terminal VCC 59 4, and the grounding.
As a further aspect of the present invention: the output end of the voltage comparator U12A and the output end of the voltage comparator U12B are used for outputting high and low level control signals.
As a further aspect of the present invention: and the output end of the voltage comparator U12A and the output end of the voltage comparator U12B output high and low level control signals to respectively control the on and off of the two photoelectric couplers.
As a further aspect of the present invention: the output end of the voltage comparator U12A is connected with the cathode of a light-emitting diode in a photoelectric coupler U9, the anode of the light-emitting diode in the photoelectric coupler U9 is connected with a power supply VCC4 through a resistor R74, the collector of a photosensitive triode in the photoelectric coupler U9 is connected with a 5V power supply, and the emitter of the photosensitive triode in the photoelectric coupler U9 is grounded through a resistor R67; the output end of the voltage comparator U12B is connected with the cathode of a light-emitting diode in a photoelectric coupler U10, the anode of the light-emitting diode in the photoelectric coupler U10 is connected with a power supply VCC4 through a resistor R73, the collector of a photosensitive triode in the photoelectric coupler U10 is connected with a 5V power supply, and the emitter of the photosensitive triode in the photoelectric coupler U10 is grounded through a resistor R66.
As a further aspect of the present invention: the photocoupler U9 and the photocoupler U10 both adopt PC 817B.
As a further aspect of the present invention: the precision adjustable linear voltage regulator U13 adopts TL 431.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses cross undervoltage protection module and only with divider resistance of the same kind, can adjust the threshold value of undervoltage simultaneously through adjusting resistance R65's resistance, reduced the use of resistance on the one hand, on the other hand has saved the consumption, adopts resistance and TL431 of high accuracy just can realize crossing the accurate regulation of undervoltage threshold value.
Drawings
Fig. 1 is a schematic circuit diagram of an over-voltage and under-voltage protection module.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Fig. 1 is the circuit diagram of an embodiment of the overvoltage/undervoltage protection module of the present invention, which specifically includes a precision adjustable linear regulator U13, a resistor R62 and a voltage comparator U12, wherein the voltage comparator U12 adopts a dual voltage comparator integrated circuit LM393, and the voltage comparator U12A and the voltage comparator U12B are integrated inside the dual voltage comparator integrated circuit.
One end of the resistor R62 is connected with an input voltage BUS, the other end of the resistor R62 is connected with the resistor R63, the other end of the resistor R63 is respectively connected with the inverting end of the voltage comparator U12A and the resistor R65, the other end of the resistor R65 is respectively connected with the grounding resistor R64 and the resistor J5, the other end of the resistor J5 is connected with the inverting end of the voltage comparator U12B, the inverting end of the voltage comparator U12B is respectively connected with the resistor R71, the inverting end of the voltage comparator U12A, the K pole and the R pole of the precision adjustable linear voltage regulator U13, the A pole of the precision adjustable linear voltage regulator U13 is grounded, the other end of the resistor R71 is respectively connected with the power supply end of the voltage comparator U12A and the power supply VCC4, the grounding end of the voltage comparator U12 is grounded, the output end of the voltage comparator U12A is connected with the cathode of a light emitting diode in the photoelectric coupler U9, the positive pole of the light emitting diode in the photoelectric coupler U9 is connected with the triode V, the emitter of the photosensitive triode in the photoelectric coupler U9 is grounded through a resistor R67; the output end of the voltage comparator U12B is connected with the cathode of a light emitting diode in a photoelectric coupler U10, the anode of the light emitting diode in the photoelectric coupler U10 is connected with a power supply VCC4 through a resistor R73, the collector of a photosensitive triode in the photoelectric coupler U10 is connected with a 5V power supply, the emitter of the photosensitive triode in the photoelectric coupler U10 is grounded through a resistor R66, the photoelectric coupler U9 and the photoelectric coupler U10 both adopt PC817B, and the precision adjustable linear voltage stabilizer U13 adopts TL 431.
The circuit of the utility model can be integrated into power supplies such as a switch power supply, a stabilized voltage power supply and the like, an input voltage BUS is a voltage sampling end of the power supply, when the circuit works, the input voltage BUS divides voltage through resistors R62, R63, R65 and R64, a voltage comparator LM393 is matched with a precise adjustable linear voltage stabilizer TL431 to generate a 2.5V reference source and respectively supplies power to an inverting end of the voltage comparator U12A and a homophase end of the voltage comparator U12B, thus, a high level can be generated at the output end of the voltage comparator U12A or the output end of the voltage comparator U12B, the photocoupler U9 is cut off because the output level of the voltage comparator U12A is high, the photocoupler U10 is cut off because the output level of the voltage comparator U12A is high, thereby realizing the control of the make-break of the photocoupler U9 and the make-break of the U10, thus, as long as the 5V power supply end connected with the photocoupler U9 and the U10 of the utility model is connected to the, the overvoltage and undervoltage detection protection of the input voltage can be realized.
To sum up, the utility model discloses only with divider resistance all the way, can adjust the threshold value of undervoltage simultaneously through adjusting resistance R65's resistance, reduced the use of resistance on the one hand, on the other hand has saved the consumption, adopts resistance and TL431 of high accuracy just can realize the accurate regulation of undervoltage threshold value.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. An overvoltage and undervoltage protection module is characterized by comprising a precise adjustable linear voltage regulator U13, a resistor R62, a voltage comparator U12A and a voltage comparator U12B, wherein one end of the resistor R62 is connected with an input voltage BUS, the other end of the resistor R62 is connected with a resistor R63, the other end of the resistor R63 is respectively connected with a homophase end of the voltage comparator U12A and a resistor R65, the other end of the resistor R65 is respectively connected with a grounding resistor R64 and a resistor J5, the other end of the resistor J5 is connected with an inversion end of the voltage comparator U12B, the homophase end of the voltage comparator U12B is respectively connected with a resistor R71, an inversion end of the voltage comparator U12A, a K pole and an R pole of the precise adjustable linear voltage regulator U13, an A pole of the precise adjustable linear voltage regulator U13 is grounded, the other end of the resistor R71 is respectively connected with a power supply end of the voltage comparator U12A and a power supply VCC.
2. The under-voltage and over-voltage protection module according to claim 1, wherein the output terminal of the voltage comparator U12A and the output terminal of the voltage comparator U12B are used for outputting high and low level control signals.
3. The under-voltage and over-voltage protection module of claim 2, wherein the output terminal of the voltage comparator U12A and the output terminal of the voltage comparator U12B output high and low level control signals for controlling the on/off of two photo-couplers respectively.
4. The overvoltage and undervoltage protection module according to any one of claims 1 to 3, wherein the output terminal of the voltage comparator U12A is connected to the negative terminal of a light emitting diode in a photocoupler U9, the positive terminal of the light emitting diode in the photocoupler U9 is connected to a power supply VCC4 through a resistor R74, the collector of a phototriode in a photocoupler U9 is connected to the power supply, and the emitter of the phototriode in a photocoupler U9 is grounded through a resistor R67; the output end of the voltage comparator U12B is connected with the cathode of a light-emitting diode in a photoelectric coupler U10, the anode of the light-emitting diode in the photoelectric coupler U10 is connected with a power supply VCC4 through a resistor R73, the collector of a photosensitive triode in the photoelectric coupler U10 is connected with the power supply, and the emitter of the photosensitive triode in the photoelectric coupler U10 is grounded through a resistor R66.
5. The overvoltage and undervoltage protection module according to claim 4, wherein the photocoupler U9 and the photocoupler U10 are both PC 817B.
6. The under-voltage and over-voltage protection module according to claim 4, wherein the precision adjustable linear voltage regulator U13 is TL 431.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921346212.XU CN210074759U (en) | 2019-08-19 | 2019-08-19 | Over-voltage and under-voltage protection module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921346212.XU CN210074759U (en) | 2019-08-19 | 2019-08-19 | Over-voltage and under-voltage protection module |
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| CN210074759U true CN210074759U (en) | 2020-02-14 |
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| CN201921346212.XU Active CN210074759U (en) | 2019-08-19 | 2019-08-19 | Over-voltage and under-voltage protection module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023273294A1 (en) * | 2021-06-29 | 2023-01-05 | 杭州米福科技有限公司 | Front-end auxiliary circuit of high-power capacitive load instrument |
-
2019
- 2019-08-19 CN CN201921346212.XU patent/CN210074759U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023273294A1 (en) * | 2021-06-29 | 2023-01-05 | 杭州米福科技有限公司 | Front-end auxiliary circuit of high-power capacitive load instrument |
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