CN207926444U - A kind of dual output inverse-excitation type switch power-supply - Google Patents
A kind of dual output inverse-excitation type switch power-supply Download PDFInfo
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- CN207926444U CN207926444U CN201820092571.6U CN201820092571U CN207926444U CN 207926444 U CN207926444 U CN 207926444U CN 201820092571 U CN201820092571 U CN 201820092571U CN 207926444 U CN207926444 U CN 207926444U
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Abstract
The utility model discloses a kind of dual output inverse-excitation type switch power-supply, including main control circuit, converter and output rectifier and filter；Main control circuit includes power tube drive circuit, current sampling circuit and the voltage feedback circuit for controlling chip UC3842 and being connect with control chip UC3842；Converter includes power switch tube, high frequency transformer, the first snubber circuit and the second snubber circuit, the input terminal of power switch tube is connect with power tube drive circuit, the first snubber circuit respectively, the input terminal connection of output end and high frequency transformer；High frequency transformer is connect with current sampling circuit, the second snubber circuit and output rectifier and filter respectively.Dual output inverse-excitation type switch power-supply provided by the utility model, high frequency voltage and electric current can be effectively eliminated to interfere caused by power switch tube and resonance noise, the reliability of Switching Power Supply is improved, while reducing production cost, has the characteristics that manufacturing cost is low, interference free performance is good.
Description
Technical field
The utility model belongs to switch power technology field, is related to a kind of dual output inverse-excitation type switch power-supply.
Background technology
With the rapid development of household electric appliances, information industry, telecommunications industry, the development in power supply market, Switching Power Supply is pushed to obtain
Further development is arrived, Switching Power Supply has obtained prodigious popularization in application field at present, but existing Switching Power Supply exists
In use, there are larger noise and interference, due in power work, power tube is operated on off state, high frequency voltage and
Electric current generates interference and resonant noise when passing through circuit element, can influence the work of Switching Power Supply, Simultaneous Switching power supply exists can
The shortcomings that, stability relatively low, of high cost by property is poor and poor anti jamming capability, reduces the service life of Switching Power Supply, is not easy to
Switching Power Supply is widely used.
Utility model content
A kind of dual output inverse-excitation type switch power-supply provided by the utility model, solving existing Switching Power Supply, there are anti-interference
Energy force difference, the problem that reliability is low and manufacturing cost is high, greatly reduce the service life of Switching Power Supply.
The purpose of this utility model can be achieved through the following technical solutions：
A kind of dual output inverse-excitation type switch power-supply, including main control circuit, converter and output rectifier and filter；
Input dc power is connect by converter with output rectifier and filter, and the converter and main control circuit are two-way
Connection, output rectifier and filter are connect with main control circuit；
The main control circuit includes controlling chip UC3842 and being driven with the control chip UC3842 power tubes connecting
Circuit, current sampling circuit and voltage feedback circuit, the voltage feedback circuit are connect with output rectifier and filter；
The converter includes power switch tube, high frequency transformer, the first snubber circuit and the second snubber electricity
The input terminal on road, the power switch tube is connect with power tube drive circuit, the first snubber circuit respectively, output end and height
The input terminal of frequency power transformer connects；The high frequency transformer respectively with current sampling circuit, the second snubber circuit and output
Current rectifying and wave filtering circuit connects.
Further, the power tube drive circuit includes resistance R8, resistance R10 and resistance R11, and the one of the resistance R8
The 6th pin with control chip UC3842 is held to connect, the other end is connect with resistance R10 and metal-oxide-semiconductor grid, and the source electrode of metal-oxide-semiconductor is logical
Resistance R11 is crossed to connect with resistance R10.
Further, the current sampling circuit includes resistance R9 and capacitance C13, the one end resistance R9 and the one end capacitance C13
Connection, the resistance R9 other ends are connect with the one end resistance R11, and the capacitance C13 other ends are connect with the resistance R11 other ends.
Further, the voltage feedback circuit includes capacitance C4 and capacitance C5, the one end capacitance C5 and control chip
The 7th pin of UC3842 connects, capacitance C4 and capacitance C5 earths.
Further, first snubber circuit includes resistance R12, capacitance C10 and diode VD4, capacitance C10 mono-
End is connect with the drain electrode of metal-oxide-semiconductor, and the other end is connect with diode VD4 anodes and the one end resistance R12 respectively, diode VD4 cathodes
It is connect with the resistance R12 other ends with resistance R9；
Second snubber circuit includes resistance R2, capacitance R15 and diode VD1, the resistance R2 and capacitance R15
Parallel connection, the resistance R2 are connect with diode VD1 cathodes.
The beneficial effects of the utility model：
Dual output inverse-excitation type switch power-supply provided by the utility model, passes through power switch tube and the first snubber circuit
Connection, can effectively eliminate power switch when in use, high frequency voltage and electric current are interfered caused by power switch tube and made an uproar with resonance
Sound, and then the normal work with the energy is influenced, in addition, by between main control circuit, converter and output rectifier and filter
Connection can carry out power switch tube protection and voltage stabilizing, improve the reliability of Switching Power Supply, while reducing production cost,
Have the characteristics that manufacturing cost is low, interference free performance is good.
Description of the drawings
In order to illustrate more clearly of the technical solution of the utility model embodiment, make required for being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the utility model,
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
Other attached drawings.
Fig. 1 is a kind of system diagram of dual output inverse-excitation type switch power-supply in the utility model；
Fig. 2 is a kind of circuit diagram of dual output inverse-excitation type switch power-supply in the utility model.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
The all other embodiment obtained, shall fall within the protection scope of the present invention.
Please refer to Fig.1 with shown in 2, a kind of dual output inverse-excitation type switch power-supply, including main control circuit, converter and output
Current rectifying and wave filtering circuit；
Input dc power is connect by converter with output rectifier and filter, and the converter and main control circuit are two-way
Connection, output rectifier and filter are connect with main control circuit；The main control circuit include control chip UC3842 and with
Control power tube drive circuit, current sampling circuit and the voltage feedback circuit of chip UC3842 connections, the Voltage Feedback electricity
Road is connect with output rectifier and filter；
The power tube drive circuit includes resistance R8, resistance R10 and resistance R11, one end of the resistance R8 and control
The 6th pin of chip UC3842 connects, and the other end is connect with the grid of resistance R10 and metal-oxide-semiconductor, and the source electrode of metal-oxide-semiconductor passes through resistance
R11 is connect with resistance R10；The power driving circuit is used to control the opening and closing of metal-oxide-semiconductor, the control chip UC3842
The pulse of output directly drives power switch tube, and resistance R10 is for limiting peak point current；
Current sampling circuit includes resistance R9 and capacitance C13, and the one end resistance R9 is connect with the one end capacitance C13, and resistance R9 is another
One end is connect with the one end resistance R11, and the capacitance C13 other ends are connect with the resistance R11 other ends, and the current sampling circuit is for adopting
The electric current of afflux overpower switch, the filter circuit being made up of resistance and capacitance are eliminated the kurtosis in electric current, and then are reduced
The loss of electric current.
Voltage feedback circuit is used for control chip UC3842 feedback voltages, and exports stable voltage, and the voltage is anti-
Current feed circuit includes capacitance C4 and capacitance C5, and the one end capacitance C5 is connect with the 7th pin of control chip UC3842, capacitance C4 and capacitance
C5 earths.
The converter includes power switch tube, high frequency transformer, the first snubber circuit and the second snubber electricity
The input terminal on road, power switch tube is connect with power tube drive circuit, the first snubber circuit respectively, and output end becomes with high frequency
The input terminal of depressor connects；High frequency transformer respectively with current sampling circuit, the second snubber circuit and output rectification filter
Circuit connects；
The power switch tube is metal-oxide-semiconductor；First snubber circuit includes resistance R12, capacitance C10 and diode
VD4, the drain electrode connection of the one end capacitance C10 and metal-oxide-semiconductor, the other end are connect with diode VD4 anodes and the one end resistance R12 respectively,
Diode VD4 cathodes and the resistance R12 other ends are connect with resistance R9；Second snubber circuit include resistance R2, capacitance R15 and
Diode VD1, the resistance R2 is in parallel with capacitance R15, and the resistance R2 is connect with diode VD1 cathodes.
The output rectifier and filter includes diode VD2, diode VD3, resistance R7 and capacitance C3, high frequency transformer
One input terminal is connect by diode VD2 with diode VD3, and the resistance R7 is in parallel with capacitance C3, the one end the capacitance C3 with
Another input terminal connection of high frequency transformer, the node connection between the other end and diode VD2 and diode VD3.
When metal-oxide-semiconductor ends, peak voltage pulse is stored into capacitor C10, and is consumed by resistance R12, realizes spike
The absorption of voltage, when metal-oxide-semiconductor being avoided to turn off, the peak voltage pulse of generation and cause electromagnetic interference, the first snubber circuit
Noise caused by with effectively peak voltage pulse is suppressed or eliminated.
The circuit input direct-current voltage charges to capacitance C4 through resistance R1, when capacitance C4 reaches 16V, controls chip
UC3842 starts to work, and the operating voltage for controlling chip UC3842 later is provided by voltage feedback circuit；
The voltage signal of current sampling circuit is by the 3rd pin input control chip UC3842, when voltage is more than 1V, control
The 6th pin of coremaking piece UC3842 stops output pulse, realizes the effective protection to metal-oxide-semiconductor and has the function of burning voltage.
Dual output inverse-excitation type switch power-supply provided by the utility model, passes through power switch tube and the first snubber circuit
Connection, can effectively eliminate power switch when in use, high frequency voltage and electric current are interfered caused by power switch tube and made an uproar with resonance
Sound, and then the normal work with the energy is influenced, in addition, by between main control circuit, converter and output rectifier and filter
Connection can carry out power switch tube protection and voltage stabilizing, improve the reliability of Switching Power Supply, while reducing production cost,
Have the characteristics that manufacturing cost is low, interference free performance is good.
Above content is only to the utility model structure example and explanation, the technology people of affiliated the art
Member makes various modifications or additions to the described embodiments or substitutes by a similar method, without departing from reality
With novel structure or beyond the scope defined by this claim, all should belong to the protection range of the utility model.
Claims (5)
1. a kind of dual output inverse-excitation type switch power-supply, it is characterised in that：Including main control circuit, converter and output rectification filter
Circuit；
Input dc power is connect by converter with output rectifier and filter, the converter and the two-way company of main control circuit
It connects, output rectifier and filter is connect with main control circuit；
The main control circuit include control chip UC3842 and with control chip UC3842 connect power tube drive circuit,
Current sampling circuit and voltage feedback circuit, the voltage feedback circuit are connect with output rectifier and filter；
The converter includes power switch tube, high frequency transformer, the first snubber circuit and the second snubber circuit, institute
The input terminal for stating power switch tube is connect with power tube drive circuit, the first snubber circuit respectively, and output end becomes with high frequency
The input terminal of depressor connects；The high frequency transformer respectively with current sampling circuit, the second snubber circuit and output rectification
Filter circuit connects.
2. a kind of dual output inverse-excitation type switch power-supply according to claim 1, it is characterised in that：The power tube driving electricity
Road includes that one end of resistance R8, resistance R10 and resistance R11, the resistance R8 are connect with the 6th pin of control chip UC3842,
The other end is connect with resistance R10 and metal-oxide-semiconductor grid, and the source electrode of metal-oxide-semiconductor is connect by resistance R11 with resistance R10.
3. a kind of dual output inverse-excitation type switch power-supply according to claim 1, it is characterised in that：The current sampling circuit
Including resistance R9 and capacitance C13, the one end resistance R9 is connect with the one end capacitance C13, and the resistance R9 other ends connect with the one end resistance R11
It connects, the capacitance C13 other ends are connect with the resistance R11 other ends.
4. a kind of dual output inverse-excitation type switch power-supply according to claim 1, it is characterised in that：The voltage feedback circuit
Including capacitance C4 and capacitance C5, the one end capacitance C5 is connect with the 7th pin of control chip UC3842, and capacitance C4 is in parallel with capacitance C5
Ground connection.
5. a kind of dual output inverse-excitation type switch power-supply according to claim 1, it is characterised in that：First snubber
Circuit includes resistance R12, capacitance C10 and diode VD4, the drain electrode connection of the one end capacitance C10 and metal-oxide-semiconductor, the other end respectively with
Diode VD4 anodes are connected with the one end resistance R12, and diode VD4 cathodes and the resistance R12 other ends are connect with resistance R9；
Second snubber circuit include resistance R2, capacitance R15 and diode VD1, the resistance R2 and capacitance R15 simultaneously
Connection, the resistance R2 are connect with diode VD1 cathodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820092571.6U CN207926444U (en) | 2018-01-19 | 2018-01-19 | A kind of dual output inverse-excitation type switch power-supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820092571.6U CN207926444U (en) | 2018-01-19 | 2018-01-19 | A kind of dual output inverse-excitation type switch power-supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207926444U true CN207926444U (en) | 2018-09-28 |
Family
ID=63604893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820092571.6U Expired - Fee Related CN207926444U (en) | 2018-01-19 | 2018-01-19 | A kind of dual output inverse-excitation type switch power-supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207926444U (en) |
-
2018
- 2018-01-19 CN CN201820092571.6U patent/CN207926444U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| 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: 20180928 Termination date: 20210119 |