CN205725444U - A kind of low-voltage alternating current power supply - Google Patents
A kind of low-voltage alternating current power supply Download PDFInfo
- Publication number
- CN205725444U CN205725444U CN201620579403.0U CN201620579403U CN205725444U CN 205725444 U CN205725444 U CN 205725444U CN 201620579403 U CN201620579403 U CN 201620579403U CN 205725444 U CN205725444 U CN 205725444U
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- power supply
- audion
- diode
- resistance
- earth terminal
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Abstract
The utility model discloses a kind of low-voltage alternating current power supply, be used for solving the problem that traditional low-voltage alternating current power supply is easily burned out.Relay normal-closed end is accessed transformer by this utility model; secondary coil outfan string one sampling resistor altogether; collect short-circuit signal through total radio amplifier; current rectifying and wave filtering circuit; bleeder circuit triggers controlled silicon conducting after processing; relay works, and on off state transfers to normally opened, cuts off the electricity supply to reach to protect purpose.This utility model also uses the multiple protection measure such as critesistor and protective tube.
Description
Technical field
This utility model relates to power technique fields, specifically a kind of low-voltage alternating current power supply.
Background technology
Ac low-voltage power supply is generally added electric fuse by transformator and forms, and this pure protected mode effect by electric fuse has
Limit, improper use is easily caused transformator damage, even results in fire.It is necessary for this to develop the low pressure that a kind of defencive function is higher
Alternating current power supply.
Utility model content
The purpose of this utility model is for the deficiencies in the prior art, it is provided that the low-voltage AC of a kind of multi-stage protection
Source.
The technical solution of the utility model is as follows:
A kind of low-voltage alternating current power supply, including the first transformator, the live wire input of the first transformator is serially connected with protective tube, the
The secondary coil of one transformator has 2 output taps, is connected to the first outfan of low-voltage alternating current power supply by the first switch, its
Be characterised by: include built-in D.C. regulated power supply module, the positive voltage output end of D.C. regulated power supply module be close to
The critesistor of one transformator is connected, and the other end of critesistor is connected to the first end of the 3rd resistance, the second of the 3rd resistance
End is connected to earth terminal, and another outfan of D.C. regulated power supply module is connected to earth terminal, and the first end of the 3rd resistance is connected to
The positive pole of the 9th diode, the negative pole of the 9th diode is connected to silicon controlled and controls pole；The live wire input of the first transformator
Also concatenating the normally closed switch of relay, the coil two ends of relay are respectively connected to earth terminal and the colelctor electrode of the second audion；
Second audion is PNP type triode, and the emitter-base bandgap grading of the second audion is connected to the positive voltage output end of D.C. regulated power supply module, the
The two ends of nine resistance are respectively connected to base stage and the emitter-base bandgap grading of the second audion；The public output warp of the secondary coil of the first transformator
First resistance is connected to the second outfan of low-voltage alternating current power supply；Second outfan of low-voltage alternating current power supply connects through the 3rd electric capacity
To the base stage of the first audion, the first audion is NPN type triode, and the two ends of the 5th resistance are respectively connecting to the first audion
Base stage and colelctor electrode；The public output of the secondary coil of the first transformator is connected with earth terminal, the current collection of the first audion
Pole is connected to earth terminal, and the colelctor electrode of the first audion is connected to the emitter-base bandgap grading of the second audion, the one or three pole by the 7th resistance
The colelctor electrode of pipe is connected to the negative pole of the 5th diode by the 4th electric capacity, and the positive pole of the 5th diode is connected to earth terminal, the
The negative pole of five diodes is connected to the positive pole of the 6th diode, and the negative pole of the 6th diode is connected to the eight or two by the 6th resistance
The positive pole of pole pipe, the two ends of the 5th electric capacity are respectively connecting to earth terminal and the negative pole of the 6th diode, and the two ends of the tenth resistance are divided
Not being connected to earth terminal and the positive pole of the 8th diode, the negative pole of the 8th diode is connected to silicon controlled and controls pole, the 6th electricity
The two ends held are respectively connecting to earth terminal and the negative pole of the 8th diode, and the emitter-base bandgap grading of the second audion is through light emitting diode and the 8th
Resistance is connected to silicon controlled anode, and silicon controlled negative electrode is connected to earth terminal, and the positive pole of the 7th diode is connected to earth terminal,
The negative pole of the 7th diode is connected to the colelctor electrode of the second audion.
Further, after the factor causing stream is got rid of, protection circuit need to be allowed to exit guard mode, to this end, described low
Pressure alternating current power supply also includes press button, and the two ends of press button are respectively connecting to silicon controlled anode and negative electrode.
For different loads, need to arrange overcurrent value flexibly, to this end, further, described low-voltage alternating current power supply
Also include second switch and the second resistance being connected in parallel on the first ohmically series connection.
Compared with prior art, this utility model has the advantage that
(1) load overcurrent causes the protection of controlled silicon conducting to be first order protection, and this protection can be substantially reduced burning protective tube
Probability.
(2) the overheated protection causing controlled silicon conducting of transformator is second level protection, and this utility model monitors the most in real time
The temperature of one transformator, when stream even short circuit crossed by outfan, once because crossing flow control module fault and inoperative situation
Under, it is possible to realize protection with temperature control modules.
(3) settings button switch between silicon controlled anode and negative electrode, after the factor causing stream is got rid of, can make low
Pressure alternating current power supply is promptly restored to duty.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Detailed description of the invention
As it is shown in figure 1, a kind of low-voltage alternating current power supply, including the first transformator T1, the live wire input of the first transformator T1
Being serially connected with protective tube FUSE, the secondary coil of the first transformator T1 has 2 output taps, exports 12 volts and 15 volts respectively, passes through
First switch S1 is connected to the first output end vo ut of low-voltage alternating current power supply.Described low-voltage alternating current power supply includes that built-in direct current is steady
Voltage source module, the positive voltage output end Vo of D.C. regulated power supply module and the critesistor RT phase being close to the first transformator T1
Even, the other end of critesistor RT is connected to first end of the 3rd resistance R3, and second end of the 3rd resistance R3 is connected to earth terminal
GND, another outfan of D.C. regulated power supply module is connected to earth terminal GND, and first end of the 3rd resistance R3 is connected to the 9th 2
The positive pole of pole pipe D9, the negative pole of the 9th diode D9 is connected to the control pole G of controllable silicon SCR；The live wire of the first transformator T1 is defeated
Entering end and also concatenate the normally closed switch (the 1 of K1,2 ends) of relay K 1, the coil two ends of relay K 1 (the 4 of K1,5 ends) connect respectively
To earth terminal GND and the colelctor electrode of the second audion Q2；Second audion Q2 is PNP type triode, and the second audion Q2 penetrates
Pole is connected to the positive voltage output end Vo of D.C. regulated power supply module, and the two ends of the 9th resistance R9 are respectively connected to the second audion Q2's
Base stage and emitter-base bandgap grading；The public output COM of the secondary coil of the first transformator T1 is connected to low-voltage AC through the first resistance R1
The second outfan COM1 in source；Second outfan COM1 of low-voltage alternating current power supply is connected to the first audion Q1 through the 3rd electric capacity C3
Base stage, the first audion Q1 is NPN type triode, and the two ends of the 5th resistance R5 are respectively connecting to the base stage of the first audion Q1
And colelctor electrode；The public output COM of the secondary coil of the first transformator T1 is connected with earth terminal GND, the first audion Q1's
Colelctor electrode is connected to earth terminal GND, and the colelctor electrode of the first audion Q1 is connected to the second audion Q2's by the 7th resistance R7
Emitter-base bandgap grading, the colelctor electrode of the first audion Q1 is connected to the negative pole of the 5th diode D5, the 5th diode D5 by the 4th electric capacity C4
Positive pole be connected to the negative pole of earth terminal GND, the 5th diode D5 and be connected to the positive pole of the 6th diode D6, the 6th diode D6
Negative pole be connected to the positive pole of the 8th diode D8 by the 6th resistance R6, the two ends of the 5th electric capacity C5 are respectively connecting to earth terminal
GND and the negative pole of the 6th diode D6, the two ends of the tenth resistance R10 are respectively connecting to earth terminal GND's and the 8th diode D8
Positive pole, the negative pole of the 8th diode D8 is connected to silicon controlled SCR and controls pole G, and the two ends of the 6th electric capacity C6 are respectively connecting to connect
Ground end GND and the negative pole of the 8th diode D8, the emitter-base bandgap grading of the second audion Q2 connects through LED and the 8th resistance R8
To the anode A of controllable silicon SCR, the negative electrode K of controllable silicon SCR is connected to earth terminal GND, and the positive pole of the 7th diode D7 is connected to connect
Ground end GND, the negative pole of the 7th diode D7 is connected to the colelctor electrode of the second audion Q2.The two ends of press button SW connect respectively
Anode A and negative electrode K to controllable silicon SCR.Described low-voltage alternating current power supply also includes the of the series connection being connected in parallel on the first resistance R1
Two switch S2 and the second resistance R2.
Built-in D.C. regulated power supply module includes the second transformator T2, its secondary coil output 12V alternating voltage, passes through
DC voltage is obtained, for three-terminal voltage-stabilizing chip 7812 input after first to fourth diode D1-D4 rectification, the first electric capacity C1 filtering
Vin, makes the output end vo output galvanic current pressure 12V of three-terminal voltage-stabilizing chip 7812, provides power for operation for protection circuit.
The two ends of the second electric capacity C2 are respectively connecting to output end vo and the earth terminal GND of three-terminal voltage-stabilizing chip 7812.
The conducting of the primary coil of the first transformator T1 is controlled by relay K 1.During energising, the alternating voltage of 220V passes through
The primary coil of the first transformator T1 it is loaded into after the normally closed switch of relay K 1 (the 1 of K1,2 ends).The public affairs of the first transformator T1
First resistance R1 of outfan COM concatenation current sampling altogether.The value of the first resistance R1 determines the first transformator T1 output
End overcurrent value.By being connected to the second switch S2 of COM, the second resistance R2 can also be attempted by the first resistance R1, logical
Cross second switch S2 switching and change the overcurrent value of protection, facilitate protection circuit flexible Application under different occasions.
Claims (3)
1. a low-voltage alternating current power supply, including the first transformator, the live wire input of the first transformator is serially connected with protective tube, and first
The secondary coil of transformator has 2 output taps, is connected to the first outfan of low-voltage alternating current power supply by the first switch, and it is special
Levy and be: include built-in D.C. regulated power supply module, the positive voltage output end of D.C. regulated power supply module be close to first
The critesistor of transformator is connected, and the other end of critesistor is connected to the first end of the 3rd resistance, the second end of the 3rd resistance
Being connected to earth terminal, another outfan of D.C. regulated power supply module is connected to earth terminal, and the first end of the 3rd resistance is connected to
The positive pole of nine diodes, the negative pole of the 9th diode is connected to silicon controlled and controls pole；The live wire input of the first transformator is also
Concatenating the normally closed switch of relay, the coil two ends of relay are respectively connected to earth terminal and the colelctor electrode of the second audion；The
Two audions are PNP type triode, and the emitter-base bandgap grading of the second audion is connected to the positive voltage output end of D.C. regulated power supply module, the 9th
The two ends of resistance are respectively connected to base stage and the emitter-base bandgap grading of the second audion；The public output of the secondary coil of the first transformator is through
One resistance is connected to the second outfan of low-voltage alternating current power supply；Second outfan of low-voltage alternating current power supply is connected to through the 3rd electric capacity
The base stage of the first audion, the first audion is NPN type triode, and the two ends of the 5th resistance are respectively connecting to the first audion
Base stage and colelctor electrode；The public output of the secondary coil of the first transformator is connected with earth terminal, the colelctor electrode of the first audion
Being connected to earth terminal, the colelctor electrode of the first audion is connected to the emitter-base bandgap grading of the second audion, the first audion by the 7th resistance
Colelctor electrode be connected to the negative pole of the 5th diode by the 4th electric capacity, the positive pole of the 5th diode is connected to earth terminal, the 5th
The negative pole of diode is connected to the positive pole of the 6th diode, and the negative pole of the 6th diode is connected to the eight or two pole by the 6th resistance
The positive pole of pipe, the two ends of the 5th electric capacity are respectively connecting to earth terminal and the negative pole of the 6th diode, and the two ends of the tenth resistance are respectively
Being connected to earth terminal and the positive pole of the 8th diode, the negative pole of the 8th diode is connected to silicon controlled and controls pole, the 6th electric capacity
Two ends be respectively connecting to earth terminal and the negative pole of the 8th diode, the emitter-base bandgap grading of the second audion through light emitting diode and the 8th electricity
Resistance is connected to silicon controlled anode, and silicon controlled negative electrode is connected to earth terminal, and the positive pole of the 7th diode is connected to earth terminal, the
The negative pole of seven diodes is connected to the colelctor electrode of the second audion.
Low-voltage alternating current power supply the most according to claim 1, it is characterised in that also include press button, the two ends of press button
It is respectively connecting to silicon controlled anode and negative electrode.
Low-voltage alternating current power supply the most according to claim 1, it is characterised in that also include being connected in parallel on the first ohmically series connection
Second switch and the second resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620579403.0U CN205725444U (en) | 2016-06-15 | 2016-06-15 | A kind of low-voltage alternating current power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620579403.0U CN205725444U (en) | 2016-06-15 | 2016-06-15 | A kind of low-voltage alternating current power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205725444U true CN205725444U (en) | 2016-11-23 |
Family
ID=57306243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620579403.0U Withdrawn - After Issue CN205725444U (en) | 2016-06-15 | 2016-06-15 | A kind of low-voltage alternating current power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205725444U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915043A (en) * | 2016-06-15 | 2016-08-31 | 华南理工大学 | Low-voltage alternating-current power supply |
-
2016
- 2016-06-15 CN CN201620579403.0U patent/CN205725444U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915043A (en) * | 2016-06-15 | 2016-08-31 | 华南理工大学 | Low-voltage alternating-current power supply |
| CN105915043B (en) * | 2016-06-15 | 2018-06-22 | 华南理工大学 | A kind of low-voltage alternating current power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20161123 Effective date of abandoning: 20180622 |
|
| AV01 | Patent right actively abandoned |