CN206807005U - Reducing transformer with reverse connecting protection and over-voltage protecting function - Google Patents
Reducing transformer with reverse connecting protection and over-voltage protecting function Download PDFInfo
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- CN206807005U CN206807005U CN201720597245.6U CN201720597245U CN206807005U CN 206807005 U CN206807005 U CN 206807005U CN 201720597245 U CN201720597245 U CN 201720597245U CN 206807005 U CN206807005 U CN 206807005U
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Abstract
The utility model discloses a kind of reducing transformer with reverse connecting protection and over-voltage protecting function; provided with DC inputs and DC output ends; reverse-connection protection circuit and overvoltage crowbar are built-in with, the reverse-connection protection circuit connects DC inputs, and the overvoltage crowbar connects DC output ends.During non-reversal connection DC inputs, diode D51 forward conductions so that relay K1 adhesives, electrical appliance normal work.If reversal connection DC is inputted, diode D51 reverse breakdowns so that relay K1 can not adhesive, electrical appliance correspondingly not upper electricity, realize that input reverse-connection is protected.Compare LM358 5 pin and the voltage-to-ground of 6 pin; when DC output end voltages are higher than 18V; LM358 5 pin voltages are higher than 6 pin voltages; now LM358 7 pin are changed into high potential from low potential; TL494 4 pin are correspondingly in high potential; so as to stop the reduced output voltage of DC output ends, output over-voltage protection function is realized.
Description
Technical field
The utility model belongs to reducing transformer technical field, and in particular to a kind of with reverse connecting protection and over-voltage protecting function
Reducing transformer.
Background technology
Reducing transformer is using relatively broad, it is possible to provide alternating current-direct current reduced output voltage.It is anti-that existing reducing transformer does not possess input generally
Defencive function and output over-voltage protection function are connect, damage of product may be caused, while potential safety hazard is caused to user.
If the reversal connection of DC inputs and being not provided with reversal connection protection function, it is most likely that cause product to be damaged.If DC is exported
Mistakenly there is overvoltage output in end, electrical appliance will be caused to overload, it is most likely that cause electrical appliance to be damaged.For this reason, it is necessary to propose
A kind of Novel blood pressure-reducing device, overcomes above technological deficiency, there is provided specific aim safeguard measure.
Utility model content
The utility model is directed to the situation of prior art, there is provided a kind of decompression with reverse connecting protection and over-voltage protecting function
Device.
The utility model uses following technical scheme, the reducing transformer with reverse connecting protection and over-voltage protecting function, if
There are DC inputs and DC output ends, reduction voltage circuit, the preposition company of input AC source are provided between the DC inputs and DC output ends
The DC inputs are connect, the rearmounted connection DC output ends of electrical appliance load are described to have reverse connecting protection and over-voltage protecting function
Reducing transformer be characterised by that it is built-in with reverse-connection protection circuit and overvoltage crowbar, the reverse-connection protection circuit connects DC
Input, the overvoltage crowbar connect DC output ends, wherein：
The reverse-connection protection circuit includes relay K1, diode D, diode D51 and triode Q1, the relay K1
The external DC inputs of input, the both positive and negative polarity of the diode D51 connects relay K1 input and triode Q1 respectively
Colelctor electrode, the emitter stage and ground connection of the base stage of the triode Q1 by resistance R connecting triodes Q1, the diode D
The negative pole base stage that passes through resistance R connecting triodes Q1；
The overvoltage crowbar includes amplifier LM358 and pulse width modulating chip TL494, the amplifier LM358 6 pin connect
Pulse width modulating chip TL494 4 pin are connect, 5 pin of the amplifier LM358 are grounded by R29, and 7 pin of the amplifier LM358 pass through
Commutation diode D6 connects pulse width modulating chip TL494 4 pin with resistance R26.
According to above-mentioned technical proposal, the reverse-connection protection circuit also includes commutation diode, and the commutation diode is just
Pole connecting triode Q1 colelctor electrode, the negative pole connection relay K1 of commutation diode output end.
The disclosed reducing transformer with reverse connecting protection and over-voltage protecting function of the utility model, its advantage are have
There are reverse connecting protection and over-voltage protecting function, avoid damaging electrical appliance and reducing transformer in itself.
Brief description of the drawings
Fig. 1 is the reverse-connection protection circuit structure chart of the utility model preferred embodiment.
Fig. 2 is the overvoltage crowbar structure chart of the utility model preferred embodiment.
Fig. 3 is the circuit diagram of the utility model preferred embodiment.
Embodiment
The utility model discloses a kind of reducing transformer with reverse connecting protection and over-voltage protecting function, with reference to preferred reality
Example is applied, specific embodiment of the present utility model is further described.
Referring to Fig. 3 of accompanying drawing, it is preferable that the reducing transformer with reverse connecting protection and over-voltage protecting function inputs provided with DC
End and DC output ends, reduction voltage circuit is provided between the DC inputs and DC output ends, it is necessary to the input AC source of reduced output voltage
The preposition connection DC inputs, the rearmounted connection DC output ends of electrical appliance load.
Preferably, the reducing transformer with reverse connecting protection and over-voltage protecting function is built-in with reverse-connection protection circuit, described
Reverse-connection protection circuit connects DC inputs, and referring to Fig. 1 of accompanying drawing, the reverse-connection protection circuit includes relay K1, diode D,
D51 and triode Q1, the relay the K1 external DC inputs of input, the both positive and negative polarity of the diode D51 connect respectively
Relay K1 input and triode Q1 colelctor electrode, the base stage of the triode Q1 pass through resistance R connecting triodes Q1's
Emitter stage and it is grounded, the base stage that the negative pole of the diode D passes through resistance R connecting triodes Q1.
Further, the reverse-connection protection circuit also includes commutation diode, the commutation diode（1N4007）Just
Pole connecting triode Q1 colelctor electrode, the negative pole connection relay K1 of commutation diode output end.
Example, triode Q1, relay K1 and diode D composition reverse connecting protection control loops are preferable to carry out according to above-mentioned.
When normally connecting DC inputs, diode D51 forward conductions so that relay K1 adhesives, electrical appliance normal work.If user
DC is inputted to reversed, diode D51 reverse breakdowns so that relay K1 can not adhesive, electrical appliance correspondingly not upper electricity, realize defeated
Enter reversal connection protection function.
Preferably, the reducing transformer with reverse connecting protection and over-voltage protecting function is also built-in with overvoltage crowbar, institute
Overvoltage crowbar connection DC output ends are stated, referring to Fig. 2 of accompanying drawing, the overvoltage crowbar includes amplifier LM358 and pulsewidth
Modulation chip TL494, the amplifier LM358 6 pin connection pulse width modulating chip TL494 144 pin, the 5 of the amplifier LM358
Pin is grounded by R29, and 7 pin of the amplifier LM358 connect pulse width modulating chip by commutation diode D6 with resistance R26
TL494 4 pin.
According to above preferred embodiment, LM358 6 pin connect TL494 4 pin, and its reference voltage is 5V.Compare the 5 of LM358
The voltage-to-ground of pin voltage-to-ground and 6 pin, when DC output end voltages are higher than 18V, LM358 5 pin voltages are higher than 6 pin voltages,
Now LM358 7 pin are changed into high potential from low potential.When LM358 7 pin are in high potential, TL494 4 pin are accordingly located in
In high potential, so as to stop the reduced output voltage of DC output ends, output over-voltage protection function is realized.
For a person skilled in the art, the technical scheme described in foregoing embodiments can still be repaiied
Change, or equivalent substitution is carried out to which part technical characteristic, all within the spirit and principles of the utility model, that is made is any
Modification, equivalent substitution, improvement etc., should be included in the scope of protection of the utility model.
Claims (2)
1. a kind of reducing transformer with reverse connecting protection and over-voltage protecting function, provided with DC inputs and DC output ends, the DC is defeated
Enter and reduction voltage circuit is provided between end and DC output ends, the preposition connection DC inputs of input AC source, electrical appliance loads rearmounted
The DC output ends are connected, the reducing transformer with reverse connecting protection and over-voltage protecting function is characterised by that it is built-in with instead
Protection circuit and overvoltage crowbar are connect, the reverse-connection protection circuit connects DC inputs, and the overvoltage crowbar connects DC
Output end, wherein：
The reverse-connection protection circuit includes relay K1, diode D, diode D51 and triode Q1, and the relay K1's is defeated
Enter to hold external DC inputs, the both positive and negative polarity of the diode D51 connects relay K1 input and triode Q1 collection respectively
Electrode, the emitter stage and ground connection of the base stage of the triode Q1 by resistance R connecting triodes Q1, the diode D's is negative
The base stage that pole passes through resistance R connecting triodes Q1；
The overvoltage crowbar includes amplifier LM358 and pulse width modulating chip TL494, the amplifier LM358 6 pin connection arteries and veins
Wide modulation chip TL494 4 pin, 5 pin of the amplifier LM358 are grounded by R29, and 7 pin of the amplifier LM358 pass through rectification
Diode D6 connects pulse width modulating chip TL494 4 pin with resistance R26.
2. the reducing transformer according to claim 1 with reverse connecting protection and over-voltage protecting function, it is characterised in that described anti-
Connecing protection circuit also includes commutation diode, the positive pole connecting triode Q1 of commutation diode colelctor electrode, the rectification
The negative pole connection relay K1 of diode output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720597245.6U CN206807005U (en) | 2017-05-26 | 2017-05-26 | Reducing transformer with reverse connecting protection and over-voltage protecting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720597245.6U CN206807005U (en) | 2017-05-26 | 2017-05-26 | Reducing transformer with reverse connecting protection and over-voltage protecting function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206807005U true CN206807005U (en) | 2017-12-26 |
Family
ID=60743146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720597245.6U Active CN206807005U (en) | 2017-05-26 | 2017-05-26 | Reducing transformer with reverse connecting protection and over-voltage protecting function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206807005U (en) |
-
2017
- 2017-05-26 CN CN201720597245.6U patent/CN206807005U/en active Active
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