CN209488465U - A kind of power adapter circuit - Google Patents
A kind of power adapter circuit Download PDFInfo
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- CN209488465U CN209488465U CN201822122323.4U CN201822122323U CN209488465U CN 209488465 U CN209488465 U CN 209488465U CN 201822122323 U CN201822122323 U CN 201822122323U CN 209488465 U CN209488465 U CN 209488465U
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- 239000003990 capacitor Substances 0.000 claims description 53
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- 230000005674 electromagnetic induction Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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Abstract
The utility model discloses a kind of power adapter circuit, including the first current rectifying and wave filtering circuit, control circuit, transformer T1, start-up circuit, feed circuit and the second current rectifying and wave filtering circuit, control circuit includes control chip U1；The input terminal of first current rectifying and wave filtering circuit accesses alternating current, the power input and transformer T1 of the output end connection control chip U1 of the first current rectifying and wave filtering circuit；Control chip U1 connection transformer T1 simultaneously controls its switch, the output end of the power input connection start-up circuit of control chip U1, the output end of the feedback input end connection feed circuit of control chip U1；The input terminal of start-up circuit connects transformer T1, the power input of the output end connection control chip U1 of start-up circuit；The input terminal of second current rectifying and wave filtering circuit connects transformer T1, and the output end of the second current rectifying and wave filtering circuit connects load.The utility model circuit structure is simple, and circuit overall power is small.
Description
Technical field
The utility model relates to power technique fields, more particularly to a kind of power adapter circuit.
Background technique
Important power supply unit of the adapter as electronic product, is seen everywhere in our daily life, either puts
Electric appliance at home or we commonly used in equipment such as mobile phone, rechargeable batteries, require high pressure through suitable adapter
Electric main be converted into the low-voltage DC that used equipment needs.But current adapter is in actual use process
In, there is power problems and interference problem, general adapter circuit can achieve basic anti-interference, and can reduce
The power consumption of adapter, but with the development of science and technology, people are more next for the anti-interference ability and power consumption requirements of adapter
It is higher.
Utility model content
A kind of the purpose of this utility model is to provide circuit structures electricity for 5V0.8A adapter simple, low in energy consumption
Source adapter circuit.
A kind of technical solution of power adapter circuit disclosed by the utility model is:
A kind of power adapter circuit, including it is the first current rectifying and wave filtering circuit, control circuit, transformer T1, start-up circuit, anti-
Current feed circuit and the second current rectifying and wave filtering circuit, the control circuit include control chip U1.
The input terminal of first current rectifying and wave filtering circuit accesses alternating current, the output end connection of first current rectifying and wave filtering circuit
The power input and the transformer T1 of the control chip U1.
The control chip U1 connection transformer T1 simultaneously controls its switch, the power input of the control chip U1
The output end of the start-up circuit is connected, the feedback input end of the control chip U1 connects the output end of the feed circuit.
The input terminal of the start-up circuit connects the transformer T1, and the output end of the start-up circuit connects the control
The power input of chip U1.
The input terminal of second current rectifying and wave filtering circuit connects the transformer T1, second current rectifying and wave filtering circuit it is defeated
Outlet connection load.
Preferably, the transformer T1 includes primary coil, secondary coil and feedback coil, the feedback coil
Influenced to generate induced electromotive force by the secondary coil to make its it is internal generate electric current, first current rectifying and wave filtering circuit
Output end connects one end of the primary coil of the transformer T1, and the control terminal connection transformer T1's of the control chip U1 is first
The other end of grade coil, the input terminal of the start-up circuit connect the feedback coil, the input terminal connection of the feed circuit
The feedback coil of the transformer T1.
Preferably, fuse F1, institute are connected between the input terminal and alternating current of first current rectifying and wave filtering circuit
It states and is also parallel with varistor MOV1 between the input terminal and alternating current of the first current rectifying and wave filtering circuit.
Preferably, first current rectifying and wave filtering circuit includes rectifier bridge BD1, and the rectifier bridge BD1 is connected with electricity
Feel L1, the other end of the inductance L1 connects the primary coil of the transformer T1 and the power input of the control chip U1
End, the both ends of the inductance L1 are parallel with resistance R18, and the both ends of the inductance L1 are also parallel with capacitor C1 and capacitor C2, described
Capacitor C1 connects the secondary coil of the transformer T1 with the other end of capacitor C2.
Preferably, it is also connected with high pressure between first current rectifying and wave filtering circuit and the transformer T1 and absorbs electricity
Road, the high pressure absorbing circuit include one end connection institute of resistance R1, resistance R2, capacitor C3 and diode D5, the resistance R2
Capacitor C3 is stated, the other end of the resistance R2 and the resistance R1 are connected in parallel the cathode of the diode D5, the resistance R1
And the other end of capacitor C3 is connected between the inductance L1 and the primary coil of transformer T1, the anode of the diode D5 is even
Connect the other end and the control chip U1 of the primary coil of the transformer T1.
Preferably, the start-up circuit includes diode D6, resistance R9 and capacitor C4, and the diode D6 is just
Pole connects the feedback coil of the transformer T1, and one end of the resistance R9 is connected on the cathode of the diode D6, the electricity
The other end of resistance R9 connects the power input of the control chip U1, and the resistance R9 and the power supply for controlling chip U1 are defeated
Enter and is also associated with the capacitor C4 between end, the other end ground connection of the capacitor C4.
Preferably, the other end of the inductance L1 is in series with resistance R3, resistance R4 and resistance R17, the resistance
The other end of R17 is connected between the cathode of the diode D6 and the resistance D9.
Preferably, the feed circuit includes resistance R6, resistance R5 and resistance R10, one end of the resistance R6
The feedback coil of the transformer T1 is connected, the other end of the resistance R6 connects the feedback input end of the control chip U1,
The resistance R5 and resistance R10 is connected in parallel between the resistance R6 and the feedback input end of the control chip U1, the resistance
The other end of R5 and resistance R10 ground connection.
Preferably, second current rectifying and wave filtering circuit includes diode D7, the anode connection of the diode D7
The secondary coil of the transformer T1, the cathode of the diode D7 are connected with inductance L2, the other end connection of the inductance L2
There is common mode inductance LF1, the other end of the common mode inductance LF1 connects load.
Preferably, the both ends of the diode D7 be also parallel with resistance R12 and capacitor C9, the resistance R12 and
Capacitor C9 is cascaded, and the both ends of the inductance L2 are parallel with capacitor C7 and capacitor C8, the inductance L2 and the capacitor C8
Between be also parallel with resistance R11.
The utility model provides a kind of power adapter circuit, and the first current rectifying and wave filtering circuit accesses electric main, exchanges city
Electricity becomes direct current transmission after rectifying and wave-filtering is handled and is controlled to transformer T1 and control chip U1, transformer T1 by control chip U1
System switch.At this point, control chip U1 is in off working state, but the coil inside transformer T1 is due to electromagnetic induction phenomenon meeting
Induced electromotive force is generated, to export electric current and be transferred to control chip U1 by start-up circuit, the power supply for controlling chip U1 is defeated
Enter end the first current rectifying and wave filtering circuit of input and start-up circuit transmits the electric current of coming, reaches the initiation value of control chip U1 setting.This
When, it controls chip U1 and starts to work, control chip U1 control transformer T1 starts to work, by first after transformer T1 start-up operation
The high voltage direct current that current rectifying and wave filtering circuit transmission comes is converted into low-voltage direct, after the second current rectifying and wave filtering circuit converts transformer T1
Low-voltage direct carries out rectifying and wave-filtering processing, last powering load.The utility model circuit structure is simple, is filtered by the first rectification
Wave circuit and the second current rectifying and wave filtering circuit improve the anti-interference ability of circuit entirety, and electromagnetic induction occurs using inside transformer
The electric current that phenomenon generates controls chip U1 to start, and reduces circuit loss, and the small power consumption of circuit entirety, is load supplying
Power it is high.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of power adapter circuit of the utility model.
Specific embodiment
The utility model is further elaborated and is illustrated with Figure of description combined with specific embodiments below:
Referring to FIG. 1, a kind of power adapter circuit, including the first current rectifying and wave filtering circuit, control circuit, transformer T1,
Start-up circuit, feed circuit and the second current rectifying and wave filtering circuit, the control circuit include control chip U1.Control the type of chip U1
It number is LY2335, control chip U1 is the chip of a built-in MOS switch pipe, not only simplifies circuit structure, and improve
Switch efficiency.
The input terminal of first current rectifying and wave filtering circuit accesses alternating current, the output end connection of first current rectifying and wave filtering circuit
The power input and the transformer T1 of the control chip U1.Model EE13, the EE13 transformer of transformer T1 is one
The characteristics of money high frequency transformer has size small, cheap, high reliablity.
The control chip U1 connection transformer T1 simultaneously controls its switch, and control chip U1 is internal by controlling it
The on and off of metal-oxide-semiconductor is switched, thus then the primary coil for controlling transformer T1 passes through control chip to control chip U1
The circuit on or off that the ground connection of pin 3 of U1 is constituted, and then realize the switch of transformer T1.
The power input of the control chip U1 connects the output end of the start-up circuit, and the control chip U1's is anti-
Feedback input terminal connects the output end of the feed circuit.
The input terminal of the start-up circuit connects the transformer T1, and the output end of the start-up circuit connects the control
The power input of chip U1.
The input terminal of second current rectifying and wave filtering circuit connects the transformer T1, second current rectifying and wave filtering circuit it is defeated
Outlet connection load.
The transformer T1 includes primary coil, secondary coil and feedback coil, and the feedback coil is by the secondary wire
Circle influences to generate induced electromotive force to make its internal generation electric current, and the output end of first current rectifying and wave filtering circuit connects institute
One end of the primary coil of transformer T1 is stated, the control terminal of the control chip U1 connects the another of the primary coil of transformer T1
End, the input terminal of the start-up circuit connect the feedback coil, and the input terminal of the feed circuit connects the transformer T1
Feedback coil.Primary coil and feedback coil are located at the same side, primary when having electric current to flow through in the primary coil of transformer T1
Coil can generate induced electromotive force, to can also generate induced electromotive force in secondary coil, and then make feedback coil by secondary wire
The influence of circle generates induced electromotive force, and feedback coil generates induced electromotive force to produce induced current, and induced current passes through
Start-up circuit is output to control chip U1.
Fuse F1, first rectifying and wave-filtering are connected between the input terminal and alternating current of first current rectifying and wave filtering circuit
Varistor MOV1 is also parallel between the input terminal and alternating current of circuit.Fuse F1 and varistor MOV1 play protection circuit
Effect, when Current Voltage is excessively high in circuit, varistor MOV1 can be relatively-stationary to one by the voltage clamping at both ends
Value, to protect back-end circuit, fuse F1 is blown in time, can also protect back-end circuit.
First current rectifying and wave filtering circuit includes rectifier bridge BD1, and the rectifier bridge BD1 is connected with inductance L1, the inductance
The other end of L1 connects the primary coil of the transformer T1 and the power input of the control chip U1, the inductance L1's
Both ends are parallel with resistance R18, and the both ends of the inductance L1 are also parallel with capacitor C1 and capacitor C2, the capacitor C1 and capacitor C2
The other end connects the secondary coil of the transformer T1.Inductance L1, capacitor C1 and capacitor C2 form CLC filter circuit, to rectification
Electric current afterwards is filtered.
High pressure absorbing circuit is also connected between first current rectifying and wave filtering circuit and the transformer T1, the high pressure is inhaled
It receives one end that circuit includes resistance R1, resistance R2, capacitor C3 and diode D5, the resistance R2 and connects the capacitor C3, it is described
The other end of resistance R2 and the resistance R1 are connected in parallel the cathode of the diode D5, and the resistance R1 and capacitor C3's is another
End is connected between the inductance L1 and the primary coil of transformer T1, and the anode of the diode D5 connects the transformer T1
Primary coil the other end and the control chip U1.
The start-up circuit includes the anode connection change of diode D6, resistance R9 and capacitor C4, the diode D6
The feedback coil of depressor T1, one end of the resistance R9 are connected on the cathode of the diode D6, the other end of the resistance R9
The power input of the control chip U1 is connected, is also joined between the resistance R9 and the power input of the control chip U1
There are the capacitor C4, the other end ground connection of the capacitor C4.Diode D6 is that one-way conduction diode can prevent current reflux, electricity
Hindering R9 is to adjust resistance, by replacing the size of resistance R9, the size of the adjustable electric current for being input to control chip U1.
The other end of the inductance L1 is in series with resistance R3, resistance R4 and the other end of resistance R17, the resistance R17 connect
It connects between the cathode and the resistance D9 of the diode D6.Resistance R3, resistance R4 and resistance R17 are current-limiting resistance, string
Connection is connected to before the power input of control chip U1, plays the role of current limliting.
The feed circuit includes one end connection transformer of resistance R6, resistance R5 and resistance R10, the resistance R6
The feedback coil of T1, the other end of the resistance R6 connect the feedback input end of the control chip U1, the resistance R5 and electricity
Resistance R10 is connected in parallel between the resistance R6 and the feedback input end of the control chip U1, and the resistance R5 and resistance R10's is another
One end ground connection.Resistance R5 and resistance R6 forms bleeder circuit, and control chip U1 is facilitated to be acquired.Feed circuit can timely to
The information of voltage in chip U1 feed circuit is controlled, when the overtension in circuit, control chip U1 can timely close change
Depressor, timely breaking circuit, so that circuit be protected not to be burned.
Second current rectifying and wave filtering circuit includes diode D7, and the anode of the diode D7 connects the transformer T1's
Secondary coil, the cathode of the diode D7 are connected with inductance L2, and the other end of the inductance L2 is connected with common mode inductance LF1,
The other end of the common mode inductance LF1 connects load.
The both ends of the diode D7 are also parallel with resistance R12 and capacitor C9, the resistance R12 and capacitor C9 are connected on one
It rises, the both ends of the inductance L2 are parallel with capacitor C7 and capacitor C8, are also parallel with electricity between the inductance L2 and the capacitor C8
Hinder R11.Diode D7 is Schottky barrier diodes, and diode D7 switchs sensitive and small power consumption.Resistance R12 and capacitor C9 group
At RC filter circuit, inductance L2, capacitor C7 and capacitor C8 form CLC filter circuit.Electric current after transformer T1 conversion, it is first
The RC filter circuit for first passing through resistance R12 and capacitor C9 composition is filtered, and is formed using inductance L2, capacitor C7 and capacitor C8
CLC filter circuit, be finally input to load again after common mode inductance LF1, have very strong anti-interference ability so that output
Electric current to load is more stable.
The utility model provides a kind of power adapter circuit, and the first current rectifying and wave filtering circuit accesses electric main, exchanges city
Electricity becomes direct current transmission after rectifying and wave-filtering is handled and is controlled to transformer T1 and control chip U1, transformer T1 by control chip U1
System switch.At this point, control chip U1 is in off working state, but the coil inside transformer T1 is due to electromagnetic induction phenomenon meeting
Induced electromotive force is generated, to export electric current and be transferred to control chip U1 by start-up circuit, the power supply for controlling chip U1 is defeated
Enter end the first current rectifying and wave filtering circuit of input and start-up circuit transmits the electric current of coming, reaches the initiation value of control chip U1 setting.This
When, it controls chip U1 and starts to work, control chip U1 control transformer T1 starts to work, by first after transformer T1 start-up operation
The high voltage direct current that current rectifying and wave filtering circuit transmission comes is converted into low-voltage direct, after the second current rectifying and wave filtering circuit converts transformer T1
Low-voltage direct carries out rectifying and wave-filtering processing, last powering load.The utility model circuit structure is simple, is filtered by the first rectification
Wave circuit and the second current rectifying and wave filtering circuit improve the anti-interference ability of circuit entirety, and electromagnetic induction occurs using inside transformer
The electric current that phenomenon generates controls chip U1 to start, and reduces circuit loss.The utility model is particularly adapted to 5V0.8A adaptation
Device, the small power consumption of circuit entirety are that the power of load supplying is high.
Finally it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than to this reality
With the limitation of novel protected range, although being explained in detail referring to preferred embodiment to the utility model, this field it is general
Lead to it will be appreciated by the skilled person that can be with the technical solution of the present invention is modified or equivalently replaced, without departing from this
The spirit and scope of utility model technical solution.
Claims (7)
1. a kind of power adapter circuit, it is characterised in that: including the first current rectifying and wave filtering circuit, control circuit, transformer T1, open
Dynamic circuit, feed circuit and the second current rectifying and wave filtering circuit, the control circuit include control chip U1；
The input terminal of first current rectifying and wave filtering circuit accesses alternating current, described in the output end connection of first current rectifying and wave filtering circuit
Control the power input and the transformer T1 of chip U1；
The control chip U1 connection transformer T1 simultaneously controls its switch, the power input connection of the control chip U1
The feedback input end of the output end of the start-up circuit, the control chip U1 connects the output end of the feed circuit；
The input terminal of the start-up circuit connects the transformer T1, and the output end of the start-up circuit connects the control chip
The power input of U1；
The input terminal of second current rectifying and wave filtering circuit connects the transformer T1, the output end of second current rectifying and wave filtering circuit
Connection load；
Fuse F1, first current rectifying and wave filtering circuit are connected between the input terminal and alternating current of first current rectifying and wave filtering circuit
Input terminal and alternating current between be also parallel with varistor MOV1；
First current rectifying and wave filtering circuit includes rectifier bridge BD1, and the rectifier bridge BD1 is connected with inductance L1, the inductance L1's
The other end connects the primary coil of the transformer T1 and the power input of the control chip U1, the both ends of the inductance L1
It is parallel with resistance R18, the both ends of the inductance L1 are also parallel with the another of capacitor C1 and capacitor C2, the capacitor C1 and capacitor C2
End connects the secondary coil of the transformer T1；
Second current rectifying and wave filtering circuit includes diode D7, and the anode of the diode D7 connects the secondary of the transformer T1
Coil, the cathode of the diode D7 are connected with inductance L2, and the other end of the inductance L2 is connected with common mode inductance LF1, described
The other end of common mode inductance LF1 connects load.
2. a kind of power adapter circuit as described in claim 1, it is characterised in that: the transformer T1 includes primary line
Circle, secondary coil and feedback coil, the feedback coil are influenced that induced electromotive force can be generated to make it by the secondary coil
Inside generates electric current, and the output end of first current rectifying and wave filtering circuit connects one end of the primary coil of the transformer T1, institute
The other end of the primary coil of the control terminal connection transformer T1 of control chip U1 is stated, the input terminal of the start-up circuit connects institute
Feedback coil is stated, the input terminal of the feed circuit connects the feedback coil of the transformer T1.
3. a kind of power adapter circuit as claimed in claim 2, it is characterised in that: first current rectifying and wave filtering circuit and institute
State and be also connected with high pressure absorbing circuit between transformer T1, the high pressure absorbing circuit include resistance R1, resistance R2, capacitor C3 and
One end of diode D5, the resistance R2 connect the capacitor C3, and the other end of the resistance R2 and the resistance R1 parallel connection connect
Connect the cathode of the diode D5, the other end of the resistance R1 and capacitor C3 be connected to the inductance L1 and transformer T1 just
Between grade coil, the anode of the diode D5 connects the other end and the control chip of the primary coil of the transformer T1
U1。
4. a kind of power adapter circuit as described in claim 1, it is characterised in that: the start-up circuit includes diode
D6, resistance R9 and capacitor C4, the anode of the diode D6 connect the feedback coil of the transformer T1, and the one of the resistance R9
End is connected on the cathode of the diode D6, and the other end of the resistance R9 connects the power input of the control chip U1,
The capacitor C4, the other end of the capacitor C4 are also associated between the resistance R9 and the power input of the control chip U1
Ground connection.
5. a kind of power adapter circuit as claimed in claim 4, it is characterised in that: the other end of the inductance L1 is in series with
Resistance R3, resistance R4 and resistance R17, the other end of the resistance R17 are connected to the cathode and the resistance of the diode D6
Between D9.
6. a kind of power adapter circuit as claimed in claim 2, it is characterised in that: the feed circuit include resistance R6,
Resistance R5 and resistance R10, one end of the resistance R6 connect the feedback coil of the transformer T1, the other end of the resistance R6
The feedback input end of the control chip U1 is connected, the resistance R5 and resistance R10 are connected in parallel on the resistance R6 and the control
Between the feedback input end of chip U1, the other end of the resistance R5 and resistance R10 are grounded.
7. a kind of power adapter circuit as described in claim 1, it is characterised in that: the both ends of the diode D7 are also in parallel
There is resistance R12 and capacitor C9, the resistance R12 and capacitor C9 are cascaded, and the both ends of the inductance L2 are parallel with capacitor C7
With capacitor C8, resistance R11 is also parallel between the inductance L2 and the capacitor C8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822122323.4U CN209488465U (en) | 2018-12-18 | 2018-12-18 | A kind of power adapter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822122323.4U CN209488465U (en) | 2018-12-18 | 2018-12-18 | A kind of power adapter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209488465U true CN209488465U (en) | 2019-10-11 |
Family
ID=68118241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822122323.4U Expired - Fee Related CN209488465U (en) | 2018-12-18 | 2018-12-18 | A kind of power adapter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209488465U (en) |
-
2018
- 2018-12-18 CN CN201822122323.4U patent/CN209488465U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191011 |
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| CF01 | Termination of patent right due to non-payment of annual fee |