CN205792251U - A kind of full isolated DC power supply - Google Patents
A kind of full isolated DC power supply Download PDFInfo
- Publication number
- CN205792251U CN205792251U CN201620468810.4U CN201620468810U CN205792251U CN 205792251 U CN205792251 U CN 205792251U CN 201620468810 U CN201620468810 U CN 201620468810U CN 205792251 U CN205792251 U CN 205792251U
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- China
- Prior art keywords
- circuit
- power supply
- filter circuit
- transformator
- controller
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Abstract
A kind of full isolated DC power supply, including: input rectifying filter circuit, transformator, output rectification circuit, output filter circuit and controller；The unidirectional current of input connects the input of input rectifying filter circuit, the outfan of input rectifying filter circuit is connected with the primary side of transformator, the secondary side of transformator is sequentially connected with output rectification circuit, output filter circuit, feedback circuit and control circuit, described controller is connected with transformator, and the outfan being simultaneously entered current rectifying and wave filtering circuit connects controller；Described output filter circuit includes tantalum electric capacity, and controller is DPA42X model.Advantage is: using tantalum electric capacity to replace traditional electrolyte electric capacity in output filter circuit, improve the service life of power supply, highly integrated DPA42X chip selected by controller, decreases the use of a large amount of components and parts, reduces the volume of power supply.
Description
Technical field
This utility model belongs to isolated DC field of power supplies, especially a kind of full isolated DC power supply.
Background technology
Insulating power supply is to utilize transformator to isolate with civil power, and no matter user encounters which single line of circuit
All without the danger having electric shock.In industrial control equipment, use the DC converter of band transformator, will
Two power supplys spaced apart, makes them separate, thus realizes object above.
Isolated DC power supply of the prior art generally comprises: input rectifying filtering part, output rectification filter
Ripple part, PWM voltage stabilizing control part, switch energy conversion portion.PWM switch voltage-stabilizing basic
Operation principle is exactly in the case of input voltage, inner parameter and external load change, and control circuit is led to
The difference crossing controlled signal and reference signal carries out closed loop feedback, regulation main circuit switch break-over of device
Pulse width so that the output voltage of Switching Power Supply or the most corresponding regulated power supply of current stabilization or Constant Electric Current
Source.Power supply of the prior art generally uses traditional electrochemical capacitor, when operating between long, when intensity is big,
Easily cause power supply to damage, affect work.Existing isolated DC power supply is generally open circuit,
When applying in other circuit, it is easily subject to the interference of peripheral circuit, affects the use of isolated DC power supply.
Additionally, the circuit of PWM control mode Switching Power Supply is complicated in prior art, it is easily damaged；PWM
Voltage stabilizing controls part general employing pulse-modulator and coordinates external protection circuit and drive circuit to maintain electricity
Pressure is stable, and external component is many, takes up space big, and no-load power consumption is big.
Summary of the invention
This utility model provides a kind of full isolated DC power supply, it is therefore an objective to extends power source life, prevents power supply
Circuit is disturbed by other peripheral circuits, reduces power volume.
For achieving the above object, a kind of full isolated DC power supply, including: input rectifying filter circuit, change
Depressor, output rectification circuit, output filter circuit and controller；The unidirectional current of input connects input rectifying
The input of filter circuit, the outfan of input rectifying filter circuit is connected with the primary side of transformator, becomes
The secondary side of depressor is sequentially connected with output rectification circuit, output filter circuit, feedback circuit and control circuit,
Described controller is connected with transformator, and the outfan being simultaneously entered current rectifying and wave filtering circuit connects controller；Institute
State output filter circuit and include tantalum electric capacity.
As preferably, described output filter circuit includes the tantalum electric capacity of multiple parallel connection；
As preferably, described output filter circuit is 4 tantalum electric capacity in parallel；
As preferably, described full isolated DC power supply also includes a protective cover；
As preferably, described output rectification circuit is made up of diode, parallel connection buffer electricity on described diode
Road, described buffer circuit is made up of resistance and capacitances in series；
As preferably, described controller is DPA42X.
The utility model has the advantages that: output filter circuit uses tantalum electric capacity replace traditional electrolyte electric capacity,
Improve the service life of power supply, highly integrated DPA42X chip selected by controller, decreases a large amount of
The use of components and parts, reduces the volume of power supply.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of full isolated DC power supply of this utility model.
Fig. 2 is the circuit diagram of a kind of full isolated DC power supply embodiment of this utility model.
Fig. 3 is a kind of full isolated DC power supply schematic appearance of this utility model.
Detailed description of the invention
Such as Fig. 1, one described in the utility model full isolated DC power supply, input direct-current electrical connection input
The input of current rectifying and wave filtering circuit, the outfan of input rectifying filter circuit connects with the primary side of transformator
Connecing, the secondary side of transformator is sequentially connected with output rectification circuit, output filter circuit, feedback circuit and control
Device processed, described controller is connected with transformator, and the outfan being simultaneously entered current rectifying and wave filtering circuit connects control
Device, the electric current of input tranformer is sampled by controller.
As in figure 2 it is shown, the unidirectional current of input is 24V in the present embodiment, transformator uses EPC13 transformation
Device；Input dc power P1 end is after the rectification circuit that diode D1 and inductance L1 connects, with transformation
Device primary side connects；Described input filter circuit is composed in parallel by electric capacity C1 and C2；Diode D4, electricity
Resistance R3 and diode D3 is in parallel with the primary side of transformator after connecting, and is used for controlling transformator primary side electricity
Pressure, prevents voltage excessive.Circuit Fault on Secondary Transformer rectification is completed by diode D5, on described diode D5
Parallel connection buffer circuit, described buffer circuit is composed in series by resistance R6 and electric capacity C5, output rectification circuit
Being made up of electric capacity C7, C8, C10, C11 the most in parallel, described electric capacity C7, C8, C10, C11 are
It is tantalum electric capacity.Output unidirectional current P3 end is connected electric capacity C13 with P4 end, and C13 is for the high frequency of outfan
Noise reduction and filtering.
Controller U1 uses DPA42X, pin D to be the test points of drain current, and pin D is connected to become
The primary side of depressor.Pin C is used to control the feedback current of dutycycle, and the biasing winding of transformator exists
Thering is provided electric current to after startup pin C, it is straight with input that pin C connects photoelectrical coupler PS2801, pin C
Stream electricity P2 end connects electric capacity C3, C3 for decoupling to controller.L pin for long-range ON/OFF and with
The input pin used during step, L pin is connected with the primary side of transformator after connecting resistance R2, resistance
R2 determines the protection threshold value of input undervoltage and overvoltage.X pin for outside ductility limit regulation and remotely opening/
Closing and control pin, be connected pin X after resistance R4 and R1 parallel connection, resistance R1 and R4 is to device inside
Current-limiting points is set, and additional line voltage detection resistances R1 for reducing limit when input voltage increases
Flow point, thus avoid too high overload output electric current.The Zener diode D2 that transformator primary side connects
Guarantee that controller peak drain voltage is less than rated value, in normal work under input surge and overpressure situation
Time, D2 is not turned on.F pin is the input pin selecting switching frequency, F pin and input dc power
P2 end connects.
Feedback circuit is to cause photoelectrical coupler U2 diode, the electric current on audion by output voltage
Change controls U1, regulates dutycycle, exports through source of stable pressure feedback and error is amplified, source of stable pressure
Heavy stream end drives the luminous component of optocoupler, and the optocoupler photographic department being in the main limit of power supply high pressure gets feedback electricity
Pressure, is used for adjusting the switch time of controller, thus obtains a galvanic current pressure output.U2
Selecting P52801 model, source of stable pressure selects TL431 model.The pin 3 of U2 is connected with the pin C of U1,
The P2 end of resistance R5 and electric capacity C4, electric capacity C4 and input dc power also it is sequentially connected with on the pin 3 of U2
Connect；The pin 4 of U2 is connected with the biasing winding of transformator after connecting electric capacity C9, and C9 is used for reducing height
Frequently switch noise impact, biasing winding links diode D6, D6 for biasing the rectification of winding, on D6
Parallel connection buffer circuit, buffer circuit is composed in series by resistance R7 and electric capacity C6；The pin 2 of U2 connects
U3, U3 are connected to export galvanic P3 end, R12 and R13 through resistance R12 and R13 of series connection
Detection for output voltage；The pin 1 of U2 is connected with resistance R8, and R8 is connected between L2 and D5,
Resistance R9 is connected between pin 1 and the pin 2 of U2；U3 upper shunt capacitance C13；Above-mentioned R5, C4,
R8, R9, C12 complete the feedback compensation of output electricity.
As it is shown on figure 3, full isolated DC power supply also includes that a protective cover 1, described protective cover 1 wrap up
Outside full DC power supply circuit.In actual application, full DC source connects usually used as a part
In other application circuits, protective cover 1 is set for power supply other peripheral circuits can be avoided to disturb, also rise
To dust-proof effect, extend the life-span of full isolated DC power supply.
Above embodiment of the present utility model is described in detail, but described content has been only this practicality newly
The preferred embodiment of type, it is impossible to be considered for limiting practical range of the present utility model.Fan Yiben is practical
Equalization change and the improvement etc. that novel application range is made, all should still belong to patent of the present utility model and contain
Within the scope of lid.
Claims (6)
1. a full isolated DC power supply, it is characterised in that: include input rectifying filter circuit, transformator,
Output rectification circuit, output filter circuit and controller；The unidirectional current of input connects input rectifying filtered electrical
The input on road, the outfan of input rectifying filter circuit is connected with the primary side of transformator, transformator
Secondary side is sequentially connected with output rectification circuit, output filter circuit, feedback circuit and control circuit, described
Controller is connected with transformator, and the outfan being simultaneously entered current rectifying and wave filtering circuit connects controller；Described defeated
Go out filter circuit and include tantalum electric capacity.
One the most according to claim 1 full isolated DC power supply, it is characterised in that: described output
Filter circuit includes the tantalum electric capacity of multiple parallel connection.
One the most according to claim 1 full isolated DC power supply, it is characterised in that: described output
Filter circuit is 4 tantalum electric capacity in parallel.
4. according to a kind of full isolated DC power supply described in claim 1 or 2 or 3, it is characterised in that:
Described full isolated DC power supply also includes protective cover.
One the most according to claim 1 full isolated DC power supply, it is characterised in that: output rectification
Circuit is made up of diode, and parallel connection buffer circuit on described diode, described buffer circuit is by resistance and electricity
Appearance is composed in series.
One the most according to claim 1 and 2 full isolated DC power supply, it is characterised in that: described
Model DPA42X selected by controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620468810.4U CN205792251U (en) | 2016-05-19 | 2016-05-19 | A kind of full isolated DC power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620468810.4U CN205792251U (en) | 2016-05-19 | 2016-05-19 | A kind of full isolated DC power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205792251U true CN205792251U (en) | 2016-12-07 |
Family
ID=58114451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620468810.4U Expired - Fee Related CN205792251U (en) | 2016-05-19 | 2016-05-19 | A kind of full isolated DC power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205792251U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112984397A (en) * | 2021-02-20 | 2021-06-18 | 嘉兴瀚睿电子科技有限公司 | Keep apart intelligent PFM underwater lamp of adjusting luminance |
-
2016
- 2016-05-19 CN CN201620468810.4U patent/CN205792251U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112984397A (en) * | 2021-02-20 | 2021-06-18 | 嘉兴瀚睿电子科技有限公司 | Keep apart intelligent PFM underwater lamp of adjusting luminance |
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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 |
Granted publication date: 20161207 Termination date: 20180519 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |