CN205141621U - Protective circuit - Google Patents
Protective circuit Download PDFInfo
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- CN205141621U CN205141621U CN201520962262.6U CN201520962262U CN205141621U CN 205141621 U CN205141621 U CN 205141621U CN 201520962262 U CN201520962262 U CN 201520962262U CN 205141621 U CN205141621 U CN 205141621U
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Abstract
The utility model belongs to the technical field of power protective circuit, concretely relates to protective circuit, partial including the voltage ratio and connect rather than electricity opposition part, voltage ratio part is connected with standard voltage output electricity including positive input terminal, negative input end and output, its positive input terminal, and the negative input end is connected with the voltage monitoring point electricity, and the output is connected with opposition part electricity, the opposition part is including input, output, its output and protective circuit output, this kind of protective circuit, circuit constitute simply, and only two parts constitute, and the electronic components of use is little, and the manufacturing cost of circuit is lower, can not only can follow the power supply condition of the whole power of the integrated module of electron and monitor according to the number of the actual frame construction set voltage monitoring point of circuit moreover, can monitor the voltage condition in the observation circuit that can be quick, accurate moreover to specific circuit point.
Description
Technical field
The utility model belongs to power protecting circuit technical field, is specifically related to a kind of protective circuit.
Background technology
Along with the fast development of electronic circuit integrated technology, the electronic device comprised in integrated circuit gets more and more, these electronic devices, almost each works under different operating voltages or electric current environment, therefore, voltage in holding circuit, electric current stable, keeps normal operating conditions particularly important for each electronic device.
Along with the fast development of electronic circuit integrated technology, protective circuit have also been obtained fast development.Existing protective circuit; circuit forms more complicated; the electronic devices and components used are also a lot; cause the manufacturing cost of circuit higher; and voltage monitoring point is very limited; can only monitor from the electric power thus supplied of the overall power supply of electronic building blocks, cannot concrete circuit point be monitored, cannot voltage condition fast, accurately in observation circuit.
Protective circuit is applied to laser product field, prevents drive circuit fault, causes laser optical power to exceed safe class, damages user; Be applied to electronics field, the electronic product work safety worked long hours can be protected, when there is circuit abnormality, fault, cutting off the electricity supply and preventing the generation of secondary disaster, as fire etc.
Utility model content
The purpose of this utility model is to solve above-mentioned deficiency, provides a kind of protective circuit.
For reaching above-mentioned purpose, the utility model provides protective circuit, it is characterized in that: the anti-phase part comprising voltage compare part and be connected electrically;
Described voltage compare part comprises positive input terminal, negative input end and output, and its positive input terminal is electrically connected with normal voltage output, and negative input end is electrically connected with voltage monitoring point, and output is electrically connected with anti-phase part;
Described anti-phase part comprises input, output, its output and protective circuit output OUT.
Described voltage compare part is voltage comparator, and this voltage comparator comprises positive incoming end, the earth terminal of its working power, positive input terminal, negative input end, output; Its positive input terminal is electrically connected with normal voltage input, and negative input end is electrically connected with voltage monitoring point, and output is electrically connected with the input of anti-phase part, and positive incoming end, earth terminal are connected with the positive pole of working power, negative electricity respectively.
Described anti-phase part comprises two inverter, resistance R1, resistance R2, electric capacity C10; described pair of inverter is provided with and connects pin one, 2,3,4,5,6; described pin one is electrically connected with the output of voltage compare part; pin two is electrically connected with earth terminal; pin 3 is electrically connected with protective circuit output OUT; pin 4 is electrically connected with pin one by resistance R2; pin 5 is electrically connected with working power positive pole; pin 6 is electrically connected with pin 3 by resistance R1, and described pin 3 is also electrically connected with earth terminal by electric capacity C10.
Described voltage compare part is at least provided with a road, and each road voltage compare part in parallel connects; The positive input terminal of described voltage compare part is electrically connected from different reference voltage input terminal, and negative input end is electrically connected from different voltage monitoring point, and output is all electrically connected with the input of anti-phase part, to monitor the voltage of Multi-channel monitoring point simultaneously.
The utility model has the advantages that: the utility model provides this protective circuit, circuit forms simple, two parts are only had to form, the electronic devices and components used are little, the manufacturing cost of circuit is lower, and the number of voltage monitoring point can be set according to the actual frame construction of circuit, can not only monitor from the electric power thus supplied of the overall power supply of electronic building blocks, and can concrete circuit point be monitored, can be quick, voltage condition in accurate observation circuit, as long as the abnormal power supply just can determining integration module of the voltage condition finding that there is place's circuit, thus protective circuit rapidly and efficiently, prevent electronic device from damaging together because of circuit supply.
Below with reference to accompanying drawing, the utility model is described in further details.
Accompanying drawing explanation
Fig. 1 is protective circuit structured flowchart.
Fig. 2 is protective circuit schematic diagram.
Fig. 3 is that protective circuit arranges four voltage monitoring point schematic diagrames.
Fig. 4 is a kind of drive circuit for laser schematic diagram.
Embodiment
The purpose of this utility model is the deficiency overcoming existing voltage protection circuit, provides a kind of protective circuit.
For reaching above-mentioned purpose, the utility model is realized by following examples:
Embodiment 1:
Provide the protective circuit shown in a kind of Fig. 1, the anti-phase part comprising voltage compare part and be connected electrically; Voltage compare part comprises positive input terminal, negative input end and output, and its positive input terminal is electrically connected with normal voltage output, and negative input end is electrically connected with voltage monitoring point, and output is electrically connected with anti-phase part; Anti-phase part comprises input, output, its output and protective circuit output OUT.
As shown in Figure 2, above-mentioned voltage compare part is voltage comparator, and this voltage comparator comprises positive incoming end, the earth terminal of its working power, positive input terminal, negative input end, output; Its positive input terminal is electrically connected with normal voltage input, and negative input end is electrically connected with voltage monitoring point, and output is electrically connected with the input of anti-phase part, and positive incoming end, earth terminal are connected with the positive pole of working power, negative electricity respectively; Above-mentioned anti-phase part comprises two inverter, resistance R1, resistance R2, electric capacity C10; described pair of inverter is provided with and connects pin one, 2,3,4,5,6; described pin one is electrically connected with the output of voltage compare part; pin two is electrically connected with earth terminal; pin 3 is electrically connected with protective circuit output OUT; pin 4 is electrically connected with pin one by resistance R2; pin 5 is electrically connected with working power positive pole; pin 6 is electrically connected with pin 3 by resistance R1, and described pin 3 is also electrically connected with earth terminal by electric capacity C10.
The voltage swing of described normal voltage is according to the voltage value of voltage monitoring point, by series resistance R3, R4 between power supply VCC and earth terminal, the resistance of regulating resistance R3, R4, thus established standards voltage, contrast with the voltage of voltage monitoring point so that follow-up, as shown in Figure 2.
In addition, the working power VCC of voltage compare part, anti-phase part and earth terminal are provided with electric capacity C1, C2 can short circuit alternating current, the interference signal of filtering circuit, guarantees voltage compare part, anti-phase part normally works.
Embodiment 2:
On the basis of above-described embodiment, described voltage compare part at least can be provided with two-way, and each road voltage compare part in parallel connects; The positive input terminal of described voltage compare part is electrically connected from different reference voltage input terminal, and negative input end is electrically connected from different voltage monitoring point, and output is all electrically connected with the input of anti-phase part, to monitor the voltage of Multi-channel monitoring point simultaneously.
As shown in Figure 3, voltage compare part is provided with four tunnels, can monitor the magnitude of voltage of four points, the normal voltage of four points is respectively 1.4V, 0.886V simultaneously, 0.3264V, 0.14139V, each output of voltage compare part all exports high level, when there being a monitoring point voltage abnormal, voltage compare part is with regard to output low level, and this level is converted to again contrary high level by anti-phase part; Anti-phase part is can keep after high level low transition always, outputs to protective circuit output OUT, and only need test OUT place level just can know whether circuit normally works, if when namely OUT place level is high level, circuit affirms exception.
Embodiment 3:
Figure 4 shows that a kind of laser works drive circuit; the protective circuit of the voltage monitoring point of four shown in above-described embodiment 2 is used to carry out voltage monitoring protection to it; the voltage monitoring point arranged is respectively MONITOR1.2, MONITORPD, MONITORLD, MONITOR0.13 in circuit; the magnitude of voltage at four contact places; the normal voltage of four points is set to 1.4V respectively; 0.886V, 0.3264V, 0.14139V.
When the magnitude of voltage in four monitoring points MONITOR1.2, MONITORPD, MONITORLD, MONITOR0.13 is normal condition, its corresponding voltage rating unit exports high level, now anti-phase part output low level, be electrically connected with the metal-oxide-semiconductor T1 in laser works drive circuit after outputting to protective circuit output OUT, control metal-oxide-semiconductor T1 and be in saturation condition, thus UNICOM's laser supply power voltage; When any one voltage in four monitoring points MONITOR1.2, MONITORPD, MONITORLD, MONITOR0.13 occurs abnormal; its corresponding voltage rating unit output low level; this low level exports high level by anti-phase part; after outputting to protective circuit output OUT; be electrically connected with the metal-oxide-semiconductor T1 in laser works drive circuit; control metal-oxide-semiconductor T1 and be in cut-off state; thus cut off laser supply power voltage; reach and prevent optical output power of laser from exceeding safe class; user is damaged, protects the object of drive circuit components and parts simultaneously.
In sum, this protective circuit, circuit forms simple, two parts are only had to form, the electronic devices and components used are little, the manufacturing cost of circuit is lower, and the number of voltage monitoring point can be set according to the actual frame construction of circuit, can not only monitor from the electric power thus supplied of the overall power supply of electronic building blocks, and can concrete circuit point be monitored, can be quick, voltage condition in accurate observation circuit, as long as the abnormal power supply just can cutting off integration module of the voltage condition finding that there is place's circuit, thus protective circuit rapidly and efficiently, prevent other electronic devices because of circuit supply damage or cause other to endanger.
More than exemplifying is only illustrate of the present utility model, does not form the restriction to protection range of the present utility model, everyly all belongs within protection range of the present utility model with the same or analogous design of the utility model.
Claims (5)
1. a protective circuit, is characterized in that: the anti-phase part comprising voltage compare part and be connected electrically;
Described voltage compare part comprises positive input terminal, negative input end and output, and its positive input terminal is electrically connected with normal voltage output, and negative input end is electrically connected with voltage monitoring point, and output is electrically connected with anti-phase part;
Described anti-phase part comprises input, output, its output and protective circuit output OUT.
2. protective circuit as claimed in claim 1, it is characterized in that: described voltage compare part is voltage comparator, this voltage comparator comprises positive incoming end, the earth terminal of its working power, positive input terminal, negative input end, output; Its positive input terminal is electrically connected with normal voltage input, and negative input end is electrically connected with voltage monitoring point, and output is electrically connected with the input of anti-phase part.
3. protective circuit as claimed in claim 1, it is characterized in that: described anti-phase part comprises two inverter, resistance R1, resistance R2, electric capacity C10, described pair of inverter is provided with connection pin one, 2, 3, 4, 5, 6, described pin one is electrically connected with the output of voltage compare part, pin two is electrically connected with earth terminal, pin 3 is electrically connected with protective circuit output OUT, pin 4 is electrically connected with pin one by resistance R2, pin 5 is electrically connected with working power positive pole, pin 6 is electrically connected with pin 3 by resistance R1, described pin 3 is also electrically connected with earth terminal by electric capacity C10.
4. protective circuit as claimed in claim 1, is characterized in that: the voltage swing of described normal voltage is according to the voltage value of voltage monitoring point.
5. protective circuit as claimed in claim 1, is characterized in that: described voltage compare part is at least provided with a road, and each road voltage compare part in parallel connects; The positive input terminal of described voltage compare part is electrically connected from different reference voltage input terminal, and negative input end is electrically connected from different voltage monitoring point, and output is all electrically connected with the input of anti-phase part, to monitor the voltage of Multi-channel monitoring point simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520962262.6U CN205141621U (en) | 2015-11-27 | 2015-11-27 | Protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520962262.6U CN205141621U (en) | 2015-11-27 | 2015-11-27 | Protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205141621U true CN205141621U (en) | 2016-04-06 |
Family
ID=55627375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520962262.6U Active CN205141621U (en) | 2015-11-27 | 2015-11-27 | Protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205141621U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106226585A (en) * | 2016-07-05 | 2016-12-14 | 广东威创视讯科技股份有限公司 | Voltage monitor and electronic equipment monitoring device |
-
2015
- 2015-11-27 CN CN201520962262.6U patent/CN205141621U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106226585A (en) * | 2016-07-05 | 2016-12-14 | 广东威创视讯科技股份有限公司 | Voltage monitor and electronic equipment monitoring device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |