CN205489445U - Teaching equipment power excessive pressure alarming protection circuit - Google Patents
Teaching equipment power excessive pressure alarming protection circuit Download PDFInfo
- Publication number
- CN205489445U CN205489445U CN201620022861.4U CN201620022861U CN205489445U CN 205489445 U CN205489445 U CN 205489445U CN 201620022861 U CN201620022861 U CN 201620022861U CN 205489445 U CN205489445 U CN 205489445U
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- electric capacity
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Abstract
The utility model discloses a teaching equipment power excessive pressure alarming protection circuit, including electric capacity C4, resistance R3, transformer W, rectifier bridge T, optical coupler IC1 and triode V1, electric capacity C4's one end connecting resistance R3, 220V alternating current and relay J's contact J -1, electric capacity C4's other end connecting resistance R3's the other end and transformer W's winding N1, transformer W's winding N1's the other end connected load A and the other end of 220V alternating current, relay J's contact J -1's other end connected load A's the other end. The utility model discloses teaching equipment power excessive pressure alarming protection circuit simple structure, components and parts are few, through optical coupler as the on -off control component, added excessive component simultaneously, when meetting the excessive pressure condition, open circuit in the twinkling of an eye not, the circuit action of effectively having avoided the voltage jump to cause only lasts the excessive pressure and just can break off the load, sends the chimes of doom simultaneously, therefore have that the function is various, convenient to use and the strong advantage of interference immunity.
Description
Technical field
This utility model relates to a kind of power circuit, specifically a kind of teaching equipment power supply over voltage alarm protection circuit.
Background technology
Along with the development of science and technology, with no paper teaching is the most universal and promotes, e-schoolbag, Electronic platform, projector
The favorable comment of vast user is received as the with no paper concomitant output educated, compared to traditional books Deng teaching electronic equipment
For, it can provide substantial amounts of education resource and education informations more intuitively, and this kind of teaching equipment is for the requirement of power supply
The highest, overtension may cause the damage of internal memory chip, causes teaching data to lose, therefore overvoltage crowbar
Being particularly important, the most common overvoltage crowbar mostly is the mode of direct deenergization, and opening velocity is fast, without omen
Formula power-off, and a lot of overpressure situation is only the generation of electrical network instantaneous abrupt change, the persistent period is the shortest, can't cause load
Damage, and saltus step can bring very big inconvenience to user repeatedly.
Utility model content
The purpose of this utility model is to provide a kind of teaching equipment power supply over voltage alarm protection circuit, to solve above-mentioned background skill
The problem proposed in art.
For achieving the above object, the following technical scheme of this utility model offer:
A kind of teaching equipment power supply over voltage alarm protection circuit, including electric capacity C4, resistance R3, transformator W, rectifier bridge T,
One end connection resistance R3,220V alternating current of photo-coupler IC1 and audion V1, described electric capacity C4 and touching of relay J
The other end of some J-1, electric capacity C4 connects the other end and the winding N1 of the winding N1 of transformator W, transformator W of resistance R3
The other end connect the other end of load A and 220V alternating current, the other end of the contact J-1 of relay J connects load A
The other end, one end of the winding N2 of transformator W connects the anode of diode D2, and the negative electrode of diode D2 connects electric capacity
The pin 1 of C1 and photo-coupler IC1, pin 2 ground connection of photo-coupler IC1, the two ends of the winding N3 of transformator W are divided
Not Lian Jie the port 1 of rectifier bridge T and the port 3 of rectifier bridge T, the port 2 of rectifier bridge T connects electric capacity C2, diode D1
Negative electrode, relay J, the foot 4 of contact J-2 and photo-coupler IC1 of relay J, the foot 3 of photo-coupler IC1 is even
The other end of connecting resistance R1 and electric capacity C3, resistance R1 connects resistance R2, the other end of electric capacity C3 and the base of audion V1
Pole, the emitter stage of audion V1 connects the other end of electric capacity C2, the other end of resistance R2, loudspeaker B and rectifier bridge T
Port 4, the colelctor electrode of audion V1 connects anode and the other end of relay J, the contact of relay J of diode D1
The other end of J-2 connects the other end of loudspeaker B, and the model of described photo-coupler IC1 is 4N25.
As preferred version of the present utility model: the contact J-1 of described relay J is normally-closed contact, the contact of relay J
J-2 is normally opened contact.
Compared with prior art, the beneficial effects of the utility model are: this utility model teaching equipment power supply over voltage alarm is protected
Circuit structure is simple, components and parts are few, by photo-coupler as switch control element, has been simultaneously introduced excessive element, has run into
During overpressure situation, will not moment disconnecting circuit, effectively prevent the circuit operation that voltage jump causes, only sustained overvoltage is
Meeting disconnecting consumers, is simultaneously emitted by chimes of doom, therefore has diverse in function, the easy to use and advantage of strong interference immunity.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of teaching equipment power supply over voltage alarm protection circuit.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out clearly
Chu, it is fully described by, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under making creative work premise
The every other embodiment obtained, broadly falls into the scope of this utility model protection.
Refer to Fig. 1, a kind of teaching equipment power supply over voltage alarm protection circuit, including electric capacity C4, resistance R3, transformator W,
Rectifier bridge T, photo-coupler IC1 and audion V1, one end of described electric capacity C4 connects resistance R3,220V alternating current and continues
The other end of the contact J-1 of electrical equipment J, electric capacity C4 connects the other end and the winding N1 of transformator W, the transformator of resistance R3
The other end of the winding N1 of W connects the other end of load A and 220V alternating current, the other end of the contact J-1 of relay J
Connecting the other end of load A, one end of the winding N2 of transformator W connects the anode of diode D2, the moon of diode D2
Pole connects the pin 1 of electric capacity C1 and photo-coupler IC1, pin 2 ground connection of photo-coupler IC1, the winding of transformator W
The two ends of N3 connect the port 1 of rectifier bridge T and the port 3 of rectifier bridge T respectively, the port 2 of rectifier bridge T connect electric capacity C2,
The negative electrode of diode D1, relay J, the foot 4 of contact J-2 and photo-coupler IC1 of relay J, photo-coupler IC1
Foot 3 connect resistance R1 and electric capacity C3, the other end of resistance R1 connects resistance R2, the other end of electric capacity C3 and audion
The base stage of V1, the emitter stage of audion V1 connects the other end of electric capacity C2, the other end of resistance R2, loudspeaker B and rectification
The port 4 of bridge T, the colelctor electrode of audion V1 connects anode and the other end of relay J, the relay J of diode D1
Contact J-2 the other end connect loudspeaker B the other end, the model of described photo-coupler IC1 is 4N25.
The contact J-1 of relay J is normally-closed contact, and the contact J-2 of relay J is normally opened contact.
Operation principle of the present utility model is: 220V line voltage is by entering transformator W after resistance R1 and electric capacity C4 blood pressure lowering
In carry out blood pressure lowering, the voltage after blood pressure lowering divides two-way to run, and D2 of leading up to is added in the foot 1 of photo-coupler IC1, another a-road-through
Again dividing two-way to run after over commutation bridge T rectification, electric capacity C1 filtering, wherein a road is added in the foot 3 of photo-coupler IC1, separately
One tunnel is added in relay J, in the case of voltage is normal, by the undertension after diode D2 to start photo-coupler
Light emitting diode within IC1, therefore its internal phototriode is also not turned on, and audion V1 ends, and relay J is not
Work, load A normally works, when line voltage is beyond the overvoltage marginal value arranged, by the voltage after diode D2
Reach to start the voltage of the light emitting diode within photo-coupler IC1, by being added in audion V1 after resistance R1 and electric capacity C3
Base stage, audion V1 turn on, relay J be energized, its normally-closed contact J-1 disconnect, protection electric loading, simultaneously its
Normally opened contact J-2 adhesive, loudspeaker B sends chimes of doom, and due to the existence of electric capacity C3, its both end voltage can not be suddenlyd change, because of
This is for the leaping voltage of short time, and circuit will not action, it is therefore prevented that circuit switchs the inconvenience caused repeatedly.
Claims (2)
1. a teaching equipment power supply over voltage alarm protection circuit, including electric capacity C4, resistance R3, transformator W, rectifier bridge T,
Photo-coupler IC1 and audion V1, it is characterised in that one end of described electric capacity C4 connect resistance R3,220V alternating current and
The other end of the contact J-1 of relay J, electric capacity C4 connects the other end and the winding N1 of transformator W, the transformation of resistance R3
The other end of the winding N1 of device W connects the other end of load A and 220V alternating current, another of the contact J-1 of relay J
End connects the other end of load A, and one end of the winding N2 of transformator W connects the anode of diode D2, diode D2's
Negative electrode connects the pin 1 of electric capacity C1 and photo-coupler IC1, pin 2 ground connection of photo-coupler IC1, the winding of transformator W
The two ends of N3 connect the port 1 of rectifier bridge T and the port 3 of rectifier bridge T respectively, the port 2 of rectifier bridge T connect electric capacity C2,
The negative electrode of diode D1, relay J, the foot 4 of contact J-2 and photo-coupler IC1 of relay J, photo-coupler IC1
Foot 3 connect resistance R1 and electric capacity C3, the other end of resistance R1 connects resistance R2, the other end of electric capacity C3 and audion
The base stage of V1, the emitter stage of audion V1 connects the other end of electric capacity C2, the other end of resistance R2, loudspeaker B and rectification
The port 4 of bridge T, the colelctor electrode of audion V1 connects anode and the other end of relay J, the relay J of diode D1
Contact J-2 the other end connect loudspeaker B the other end, the model of described photo-coupler IC1 is 4N25.
2. according to a kind of teaching equipment power supply over voltage alarm protection circuit described in claim 1, it is characterised in that described relay
The contact J-1 of device J is normally-closed contact, and the contact J-2 of relay J is normally opened contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620022861.4U CN205489445U (en) | 2016-01-08 | 2016-01-08 | Teaching equipment power excessive pressure alarming protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620022861.4U CN205489445U (en) | 2016-01-08 | 2016-01-08 | Teaching equipment power excessive pressure alarming protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205489445U true CN205489445U (en) | 2016-08-17 |
Family
ID=56666809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620022861.4U Expired - Fee Related CN205489445U (en) | 2016-01-08 | 2016-01-08 | Teaching equipment power excessive pressure alarming protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205489445U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110830024A (en) * | 2019-11-05 | 2020-02-21 | 徐州汉通电子科技有限公司 | Overvoltage protection circuit of photoelectric coupler |
| CN111352010A (en) * | 2020-04-23 | 2020-06-30 | 刘文辉 | Switch board insulation fault early warning device |
-
2016
- 2016-01-08 CN CN201620022861.4U patent/CN205489445U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110830024A (en) * | 2019-11-05 | 2020-02-21 | 徐州汉通电子科技有限公司 | Overvoltage protection circuit of photoelectric coupler |
| CN111352010A (en) * | 2020-04-23 | 2020-06-30 | 刘文辉 | Switch board insulation fault early warning device |
| CN111352010B (en) * | 2020-04-23 | 2022-06-14 | 烟台海珐电气科技有限公司 | Switch board insulation fault early warning device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160817 Termination date: 20170108 |