CN205864262U - Power-switching circuit - Google Patents
Power-switching circuit Download PDFInfo
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- CN205864262U CN205864262U CN201620555376.3U CN201620555376U CN205864262U CN 205864262 U CN205864262 U CN 205864262U CN 201620555376 U CN201620555376 U CN 201620555376U CN 205864262 U CN205864262 U CN 205864262U
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Abstract
Disclose a kind of power-switching circuit, including ac rectifier, electromagnetic interference filter circuit, flyback on-off circuit, output rectifier and filter and control circuit, wherein: the first terminal of ac rectifier and the second terminal are connected with positive pole and the negative pole of exchange input respectively, and the 3rd terminal and the 4th terminal are connected with the first terminal and second terminal of electromagnetic interference filter circuit respectively；Second terminal ground of electromagnetic interference filter circuit, the 3rd terminal is connected with the first terminal of flyback on-off circuit；Second terminal of flyback on-off circuit is connected with the first terminal of control circuit, and the 3rd terminal is connected with the second terminal of control circuit, and the 4th terminal and the 5th terminal are connected with the first terminal and second terminal of output rectifier and filter respectively；And the 3rd terminal of control circuit is via capacitor grounding, and the 4th terminal is directly grounded, and the 5th terminal is via current sense resistor ground connection.
Description
Technical field
This utility model relates to circuit field, relates more specifically to a kind of power-switching circuit.
Background technology
Now, energy-saving and emission-reduction are all being advocated in the whole world.Lower power usage (such as, is less than by Switching Power Supply or charger
30mW) and lower manufacturing cost proposes requirements at the higher level.In order to make power-switching circuit volume less, it is desirable to simplify power supply
The component counts comprised in change-over circuit.
Utility model content
This utility model provides the power-switching circuit of a kind of novelty.
According to the power-switching circuit of this utility model embodiment, including ac rectifier, electromagnetic interference filter circuit,
Flyback on-off circuit, output rectifier and filter and control circuit, wherein: the first terminal of ac rectifier and second
Terminal respectively with exchange input positive pole and negative pole be connected, the 3rd terminal and the 4th terminal respectively with electromagnetic interference filter circuit
The first terminal and the second terminal connect；Second terminal ground of electromagnetic interference filter circuit, the 3rd terminal and flyback on-off circuit
The first terminal connect；Second terminal of flyback on-off circuit is connected with the first terminal of control circuit, the 3rd terminal and control
Second terminal of circuit connects, the 4th terminal and the 5th terminal respectively with the first terminal and second end of output rectifier and filter
Son connects；And the 3rd terminal of control circuit is via capacitor grounding, and the 4th terminal is directly grounded, and the 5th terminal is via electric current
Detection resistance eutral grounding.
In the power-switching circuit according to this utility model embodiment, control circuit includes control chip, control chip
There is following pin: the colelctor electrode foot of the built-in switching tube being integrated in control chip, as the first terminal of control circuit, with
Second terminal of flyback on-off circuit connects；Assist control foot, as the second terminal of control circuit, with flyback on-off circuit
3rd terminal connects；Power supply foot, as the 3rd terminal of control circuit, via capacitor grounding；Grounding leg, as control circuit
The 4th terminal, ground connection；Current detecting foot, as the 5th terminal of control circuit, via current sense resistor ground connection.
In the power-switching circuit according to this utility model embodiment, the second terminal of control circuit and the 3rd terminal it
Between connect have diode.
Power-switching circuit according to this utility model embodiment also includes absorbing circuit, and this absorbing circuit is connected to flyback
Between the first terminal and second terminal of on-off circuit.
In the power-switching circuit according to this utility model embodiment, electromagnetic interference filter circuit includes inductance and high pressure
Electrochemical capacitor.
In the power-switching circuit according to this utility model embodiment, electromagnetic interference filter circuit also includes with inductance also
The static discharge resistance of connection.
In the power-switching circuit according to this utility model embodiment, output rectifier and filter includes exporting rectification two
Pole pipe and filter capacitor.
In the power-switching circuit according to this utility model embodiment, output rectifier and filter also includes that π type filters
Circuit and/or common mode filtering circuit.
In the power-switching circuit according to this utility model embodiment, ac rectifier includes electric fuse and rectification two
Pole is managed.
In the power-switching circuit according to this utility model embodiment, the number of commutation diode is any in 1 to 8
Number.
Compare traditional reverse exciting switching voltage regulator circuit, include less according to the power-switching circuit of this utility model embodiment
Components and parts, manufacturing cost is lower.
Accompanying drawing explanation
This practicality be may be better understood from description to detailed description of the invention of the present utility model below in conjunction with the accompanying drawings
Novel, wherein:
Fig. 1 is the circuit diagram illustrating the power-switching circuit according to this utility model embodiment；
Fig. 2 is the circuit diagram illustrating the power-switching circuit according to another embodiment of this utility model；
Fig. 3 is the schematic diagram of the various methods of attachment of EMI filter circuit 2；
Fig. 4 is the schematic diagram of the various methods of attachment of output rectifier and filter 5；
Fig. 5 is the schematic diagram of the various methods of attachment of absorbing circuit 3.
Detailed description of the invention
It is described more fully with example embodiment referring now to accompanying drawing.But, example embodiment can be with multiple shape
Formula is implemented, and is not understood as limited to embodiment set forth herein；On the contrary, it is provided that these embodiments make this practicality new
The design of example embodiment more comprehensively and completely, and is conveyed to those skilled in the art by type all sidedly.The most identical
Reference represent same or similar structure, thus their detailed description will be omitted.
In view of limitation present in traditional power-switching circuit, inventor proposes based on inverse-excitation type switch power-supply circuit
A kind of power-switching circuit of novelty.Below in conjunction with the accompanying drawings, the Power convert according to this utility model embodiment is described in detail
Circuit.
Fig. 1 is the circuit diagram illustrating the power-switching circuit according to this utility model embodiment.As it is shown in figure 1, this power supply
Change-over circuit includes ac rectifier 1, electromagnetic interference (EMI) filter circuit 2, flyback on-off circuit 3, output rectification filter electricity
Road 4 and control circuit 5, wherein:
The first terminal of ac rectifier 1 and the second terminal are connected with positive pole and the negative pole of exchange input respectively, and the 3rd
Terminal and the 4th terminal are connected with the first terminal and second terminal of electromagnetic interference filter circuit 2 respectively；EMI Filtering electricity
Second terminal ground on road 2, the 3rd terminal is connected with the first terminal of flyback on-off circuit 3；Second end of flyback on-off circuit 3
Son is connected with the first terminal of control circuit 5, and the 3rd terminal is connected with the second terminal of control circuit 5, the 4th terminal and the 5th
Terminal is connected with the first terminal and second terminal of output rectifier and filter 4 respectively；3rd terminal of control circuit 5 is via electricity
Receptacle ground, the 4th terminal is directly grounded, and the 5th terminal is via current sense resistor ground connection.
Fig. 2 is the circuit diagram illustrating the power-switching circuit according to another embodiment of this utility model.As in figure 2 it is shown, should
Power-switching circuit except include ac rectifier 1, electromagnetic interference (EMI) filter circuit 2, flyback on-off circuit 3, export whole
Also including absorbing circuit 6 beyond stream filter circuit 4 and control circuit 5, wherein absorbing circuit 6 is connected to flyback on-off circuit 3
The first terminal and the second terminal between.Here, rectification circuit 1, electromagnetic interference (EMI) filter circuit 2, flyback on-off circuit 3,
The annexation of output rectifier and filter 4 and control circuit 5 is identical with combine Fig. 1 description, does not repeats them here.
Below in conjunction with the accompanying drawings, each ingredient of the power-switching circuit shown in Fig. 1 and Fig. 2 is described in detail.
As depicted in figs. 1 and 2, ac rectifier 1 includes electric fuse FUSE and four commutation diodes, and Main Function is
AC-input voltage is carried out rectification.Here, the number of commutation diode can be the arbitrary number in 1 to 8；Electric fuse is permissible
Replace by electric fuse resistance, wire resistor, inductance or their combination in any.
As depicted in figs. 1 and 2, EMI filter circuit 2 includes an inductance, two high-voltage electrolytic capacitors and static discharge
(ESD) resistance R1, Main Function is suppression electromagnetic interference and the DC voltage that obtains rectification is filtered.According to application
The difference of scene, EMI filter circuit 2 can also include two inductance or a common mode inductance；EMI filter circuit 2 can also be wrapped
Include a high-voltage electrolytic capacitor；EMI filter circuit 2 can not also include static discharge resistance R1.In other words, EMI filtered electrical
Road 2 can include both inductance and high-voltage electrolytic capacitor, it is also possible to includes inductance, high-voltage electrolytic capacitor and and inductance in parallel
Static discharge resistance.Fig. 3 is the schematic diagram of the various methods of attachment of EMI filter circuit 2, and wherein R1 is static discharge resistance,
The resistance needed for static discharge resistance R1 can be reached by the multiple resistance of serial or parallel connection.
As depicted in figs. 1 and 2, flyback on-off circuit 3 includes flyback transformer Ns and current sense resistor Rs, mainly
Effect is that DC voltage rectification obtained is converted into the secondary relatively low alternating voltage of ratio, and by the electricity with output current in proportion
Flow through and fed back to control circuit 5 by current sense resistor Rs.Here it is possible to reach electric current by the multiple resistance of serial or parallel connection
Resistance required for detection resistance Rs.
As depicted in figs. 1 and 2, output rectifier and filter 4 include export commutation diode D3, filter capacitor Co and
Output resistance, Main Function is that the alternating voltage from flyback on-off circuit 3 is carried out rectifying and wave-filtering.For different output stricture of vaginas
Ripple requirement, output rectifier and filter 4 can increase π type filter circuit and/or common mode filtering circuit.Fig. 4 is to illustrate that output is whole
The schematic diagram of the various methods of attachment of stream filter circuit 4, wherein can reach output by multiple resistance in series or in parallel
Resistance value needed for resistance R2.
As depicted in figs. 1 and 2, control circuit 5 includes the peripheral auxiliary element of control chip U1 and necessity, wherein controls
Coremaking sheet U1 comprises 5 function feet altogether, respectively:
The colelctor electrode foot C of the built-in switching tube being integrated in control chip U1, as the first terminal of control circuit 5, with
(that is, the second terminal with flyback on-off circuit 3 connects in the anode connection of the primary side winding of the transformator Ns in flyback on-off circuit 3
Connect)；
Assist control foot AUX, starting and built-in dividing potential drop detection control function for control chip U1, as controlling electricity
Second terminal on road 5, is connected with the anode of the auxiliary winding of the transformator Ns in flyback on-off circuit 3 (that is, with flyback switch electricity
3rd terminal on road 3 connects)；
Power supply foot VDD, for providing running voltage for control chip U1, by circuit and auxiliary inside control chip U1
Control foot AUX to be connected, as the 3rd terminal of control circuit 5, via capacitor grounding；
Grounding leg GND, as the 4th terminal of control circuit 5, ground connection；And
Current detecting foot CS, is used for detecting output electric current, provides and turn off and the function such as protection, as the of control circuit 5
Five terminals, are connected with the current sense resistor Rs in flyback on-off circuit 3.
As shown in Figure 2, absorbing circuit 6 includes resistance, electric capacity Np and diode D2.According to different Power convert
The requirement of circuit, the composition of absorbing circuit 3 and/or connected mode can change.Fig. 5 is the various methods of attachment of absorbing circuit 6
Schematic diagram.
It addition, as in figure 2 it is shown, the assist control foot AUX in control circuit 5 can also be via diode D1 at control chip
U1 is externally attached to the foot VDD that powers.
Compare traditional reverse exciting switching voltage regulator circuit, the power-switching circuit according to this utility model embodiment does not includes
Start resistance and feedback divider resistance, realize built-in dividing potential drop and startup, therefore circuit structure letter by the anode of auxiliary winding
Single, low cost of manufacture, it is more suitable for the requirement of undersized charger and adapter.
This utility model can realize in other specific forms, without deviating from its spirit and essential characteristics.Therefore, currently
Embodiment be the most all counted as being exemplary rather than determinate, scope of the present utility model is wanted by appended right
Ask rather than foregoing description definition, and, fall in the range of the implication of claim and equivalent whole change thus all by
It is included among scope of the present utility model.
Claims (10)
1. a power-switching circuit, including ac rectifier, electromagnetic interference filter circuit, flyback on-off circuit, export whole
Stream filter circuit and control circuit, wherein:
The first terminal of described ac rectifier and the second terminal are connected with positive pole and the negative pole of exchange input respectively, the 3rd end
Son and the 4th terminal are connected with the first terminal and second terminal of described electromagnetic interference filter circuit respectively；
Second terminal ground of described electromagnetic interference filter circuit, the 3rd terminal connects with the first terminal of described flyback on-off circuit
Connect；
Second terminal of described flyback on-off circuit is connected with the first terminal of described control circuit, the 3rd terminal and described control
Second terminal of circuit connects, the 4th terminal and the 5th terminal respectively with the first terminal of described output rectifier and filter and the
Two-terminal connects；And
3rd terminal of described control circuit is via capacitor grounding, and the 4th terminal is directly grounded, and the 5th terminal is examined via electric current
Measuring resistance ground connection.
2. power-switching circuit as claimed in claim 1, wherein, described control circuit includes control chip, described control core
Sheet has a following pin:
The colelctor electrode foot of the built-in switching tube being integrated in described control chip, as the first terminal of described control circuit, with
Second terminal of described flyback on-off circuit connects；
Assist control foot, as the second terminal of described control circuit, is connected with the 3rd terminal of described flyback on-off circuit；
Power supply foot, as the 3rd terminal of described control circuit, via described capacitor grounding；
Grounding leg, as the 4th terminal of described control circuit, ground connection；
Current detecting foot, as the 5th terminal of described control circuit, via described current sense resistor ground connection.
3. power-switching circuit as claimed in claim 1, wherein, between the second terminal and the 3rd terminal of described control circuit
Connect and have diode.
4. power-switching circuit as claimed in claim 1, also includes:
Absorbing circuit, this absorbing circuit is connected between the first terminal and second terminal of described flyback on-off circuit.
5. power-switching circuit as claimed in claim 1, wherein, described electromagnetic interference filter circuit includes inductance and high-tension electricity
Solve electric capacity.
6. power-switching circuit as claimed in claim 5, wherein, described electromagnetic interference filter circuit also includes and described inductance
Static discharge resistance in parallel.
7. power-switching circuit as claimed in claim 1, wherein, described output rectifier and filter includes exporting rectification two pole
Pipe and filter capacitor.
8. power-switching circuit as claimed in claim 7, wherein, described output rectifier and filter also includes π type filtered electrical
Road and/or common mode filtering circuit.
9. power-switching circuit as claimed in claim 1, wherein, described ac rectifier includes electric fuse and rectification two pole
Pipe.
10. power-switching circuit as claimed in claim 9, wherein, the number of described commutation diode is any in 1 to 8
Number.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620555376.3U CN205864262U (en) | 2016-06-08 | 2016-06-08 | Power-switching circuit |
| TW105213273U TWM532692U (en) | 2016-06-08 | 2016-08-30 | Power conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620555376.3U CN205864262U (en) | 2016-06-08 | 2016-06-08 | Power-switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205864262U true CN205864262U (en) | 2017-01-04 |
Family
ID=57639526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620555376.3U Active CN205864262U (en) | 2016-06-08 | 2016-06-08 | Power-switching circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN205864262U (en) |
| TW (1) | TWM532692U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108512442A (en) * | 2017-11-27 | 2018-09-07 | 昂宝电子（上海）有限公司 | Switching power control system |
-
2016
- 2016-06-08 CN CN201620555376.3U patent/CN205864262U/en active Active
- 2016-08-30 TW TW105213273U patent/TWM532692U/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108512442A (en) * | 2017-11-27 | 2018-09-07 | 昂宝电子（上海）有限公司 | Switching power control system |
| CN108512442B (en) * | 2017-11-27 | 2020-11-13 | 昂宝电子（上海）有限公司 | Switching power supply control system |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM532692U (en) | 2016-11-21 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |