CN209389952U - Switch power source adapter circuit - Google Patents
Switch power source adapter circuit Download PDFInfo
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- CN209389952U CN209389952U CN201822120460.4U CN201822120460U CN209389952U CN 209389952 U CN209389952 U CN 209389952U CN 201822120460 U CN201822120460 U CN 201822120460U CN 209389952 U CN209389952 U CN 209389952U
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- 239000003990 capacitor Substances 0.000 claims description 57
- 238000004804 winding Methods 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
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- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
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Abstract
The utility model discloses a kind of switch power source adapter circuits, including current rectifying and wave filtering circuit, absorbing circuit, ON-OFF control circuit, transformer, secondary commutation filter circuit and feed circuit, current rectifying and wave filtering circuit input terminal is connect with electric main, rectification filter circuit output end is electrically connected with transformer primary side output end, absorbing circuit is in parallel with the output end of transformer primary side and input terminal, transformer primary side output end is electrically connected with ON-OFF control circuit control signal, ON-OFF control circuit includes control chip U1, control chip U1 built-in switch, switch is connected with transformer primary side, secondary commutation filter circuit output end is as adapter output end, secondary commutation filter circuit output end is electrically connected with feed circuit input terminal, feed circuit exports comparison signal to the feedback input end of ON-OFF control circuit.Switch power source adapter circuit provided by the utility model, structure is simple, low cost, low-power consumption.
Description
Technical field
The utility model relates to adapter technique fields, specifically, being related to a kind of switch power source adapter circuit.
Background technique
Power supply adaptor is commonly called as Switching Power Supply, also referred to as charger, is widely used in various electrical equipments, such as calculates mechanical, electrical
Depending on machine and various movable electrical appliances.In the prior art, in order to improve the reliability of electronic switch, usually using powerful
MOS switch pipe is realized, however powerful MOS switch pipe is expensive, so as to cause the increase of circuit cost and power consumption,
It also will increase its corresponding peripheral electron device, so that circuit becomes complicated.
Utility model content
The purpose of this utility model is to provide a kind of switch power source adapter circuits, and structure is simple, low cost, low function
Consumption.
Technical solution used by switch power source adapter circuit disclosed by the utility model is:
A kind of switch power source adapter circuit, including current rectifying and wave filtering circuit, absorbing circuit, ON-OFF control circuit, transformer,
Secondary commutation filter circuit and comparison circuit；
The transformer includes primary side, secondary side and feedback winding, and electric current flows to secondary side, secondary current flow direction feedback by primary side
Winding；
The current rectifying and wave filtering circuit input terminal is connect with electric main, the rectification filter circuit output end and transformer primary
The electrical connection of side output end, the absorbing circuit is in parallel with the output end of transformer primary side and input terminal, and the transformer primary side is defeated
Outlet is electrically connected with ON-OFF control circuit control signal；
The ON-OFF control circuit includes control chip U1, the control chip U1 built-in switch, the switch control change
The energization and power-off of depressor primary side, the switch are connected with transformer primary side, and the ON-OFF control circuit power end passes through feedback
Winding is electrically connected with transformer secondary, and the transformer secondary output end is electrically connected with secondary commutation filter circuit input terminal, institute
Secondary commutation filter circuit output end is stated to input as adapter output end, secondary commutation filter circuit output end and comparison circuit
End electrical connection；
Output end is set as reference voltage by the comparison circuit, and the comparison circuit is defeated with transformer secondary by reference voltage
Voltage is compared out, and comparison signal is exported to the feedback input end of ON-OFF control circuit, the ON-OFF control circuit root
According to the closure of comparison signal control switch.
Preferably, the current rectifying and wave filtering circuit includes unidirectional bridge rectifier and CLC filter circuit, the list
It is connect to bridge rectifier input terminal with electric main, the unidirectional bridge rectifier output end and CLC filter circuit are defeated
Enter end connection, the CLC filter circuit output end is connect with transformer primary side input terminal.
Preferably, the absorbing circuit include resistance R3, R8, capacitor C3 and diode D5, the capacitor C3 and
Resistance R8 connects, and after series connection and resistance R7 is in parallel, the termination transformer primary side input terminal after parallel connection, another termination after parallel connection
Diode D5 cathode, the diode D5 cathode connecting transformer primary side output end.
Preferably, the ON-OFF control circuit includes model LY6016 chip U1, switching diode D6, capacitor
C4 and CX, resistance R1, R2, R5, R14 and R16, the resistance R1 and R2 series connection, the power end of a chip termination U1 after series connection,
Another termination alternating current fire wire after series connection, the power supply termination capacitor C4 anode and diode D6 cathode of the chip U1, the electricity
Hold C4 cathode ground connection, the diode D6 cathode connecting transformer feedback winding output end, the grid terminating resistor of the chip U1
The one end R14, the power end of another chip termination U1 of resistance R14, the output of the feedback termination comparison circuit of the chip U1
End, the one end detection termination capacitor CX, the one end resistance R5 and the one end resistance R6 of the chip U1, another termination of capacitor CX become
Depressor T1 primary side output end, the resistance R5 other end and resistance R6 other end ground connection, the drain electrode of the chip U1 terminate transformation
Device primary side output end.
Preferably, the secondary commutation filter circuit includes rectifier diode D7, D8, resistance R6 and R9, capacitor
C5, C7, C8 and C10, common mode inductance LF1 and inductance L2, the resistance R6 and capacitor C5 series connection, described diode D7, D8 are the same as string
Resistance R6 and capacitor C5 after connection is in parallel, and a termination transformer secondary output end after parallel connection, the other end is as secondary after parallel connection
Output end after rectification, the capacitor C7 and C10 are in parallel, latter termination transformer secondary input terminal in parallel, the other end after parallel connection
Output end, the one side common mode inductance LF1 and the one end inductance L2, the another side the common mode inductance LF1 and transformation after connecing secondary commutation
The connection of device pair side input terminal, described one end another terminating resistor R9 inductance L2 and the one end capacitor C8, the resistance R9 other end and
Capacitor C8 other end ground connection.
It preferably, further include zener diode ZD2, after the zener diode ZD2 anode connects secondary commutation
Output end, the zener diode ZD2 cathode connect transformer secondary input terminal.
Preferably, the comparison circuit includes TL431A voltage stabilizing chip U2, photo-coupler U3, resistance R7, R10,
R11, R12, R13, R15 and capacitor C9, the output end of the chip U2 connect with the output pin of the input terminal of photo-coupler U3, institute
It is in parallel with the input terminal of photo-coupler U3 to state resistance R15, the mono- terminating resistor R15 of resistance R7, another termination of resistance R7
Transformer secondary output end, the resistance R10 and capacitor C9 series connection, it is in parallel with the output end of chip U2 and input terminal after series connection,
The resistance R12 and R13 is in parallel, one end ground connection after parallel connection, the input terminal of another chip termination U2, the resistance after parallel connection
The input terminal of mono- chip termination U2 of R11, the output end of another termination adapter of resistance R11, the photo-coupler U3's is defeated
Outlet output pin is connect with the feedback input end of chip U1.
Preferably, including safety capacitor CY1, the safety capacitor CY1 mono- terminate transformer primary side input terminal, institute
State another termination transformer secondary input terminal of safety capacitor CY1.
The beneficial effect of switch power source adapter circuit disclosed by the utility model is: MOS switch is carried inside chip U1
Pipe, reduces the quantity of electronic device, decreases other corresponding electronic devices, has saved cost.Simultaneously built in chip U1
MOS decreases the power consumption of metal-oxide-semiconductor.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model switch power source adapter circuit.
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 switch power source adapter circuit includes current rectifying and wave filtering circuit, absorbing circuit, switch control electricity
Road, transformer, secondary commutation filter circuit and comparison circuit.
Transformer T1 includes primary side Np1 and primary side Np2, pair side Ns and feedback winding Nb, primary side Np1 and primary side Np2 series connection
It is integrated.Electric current flows to secondary side by primary side, and secondary current flows to feedback winding.
After external electric main is come in, current rectifying and wave filtering circuit is first passed around.Guarantor is in series between alternating current and rectification circuit
Dangerous silk F1, alternating current both ends are parallel with varistor MOV1.Current-limiting protection element of the fuse F1 as circuit, varistor
Surge can be absorbed in MOV1, the voltage-limiting protection element as circuit.
Current rectifying and wave filtering circuit includes unidirectional bridge rectifier BD1, capacitor C1, C2 and inductance L1.Unidirectional bridge rectifier electricity
Road BD1 is made of 4 rectifier diodes, for converting alternating current to direct current.Direct current after rectification is first by electrolytic capacitor
C1 filtering, filters, then filtered by electrolytic capacitor C2 using inductance L1.
The input terminal of current direction transformer T1 primary side Np2 after rectifying and wave-filtering.
ON-OFF control circuit 20 include model LY6016 chip U1, switching diode D6, zener diode ZD1, capacitor C4,
C6, C11 and CX, resistance R1, R2, R5, R14, R16 and R17.1 foot of ground terminal of chip U1 is grounded, 1 foot of ground terminal of chip U1
Filter capacitor C11 is connected to 3 foot of power end of chip U1.Current-limiting resistance R1, R2 and zero Europe resistance R17 series connection, that connects is latter
3 foot of power end of chip termination U1, another termination alternating current fire wire after series connection.3 foot of power end of chip U1 meets filter capacitor C4
Anode and diode D6 cathode, capacitor C4 cathode ground connection, diode D6 cathode connecting transformer T1 feedback winding Nb output end.Chip
2 one end foot connecting resistance R14 of gate terminal of U1,3 foot of power end of another chip termination U1 of resistance R14.The feedback end 4 of chip U1
Foot connects the output end of comparison circuit, the one end filter capacitor C6 and zener diode ZD1 anode, the capacitor C6 other end and pressure stabilizing two
Pole pipe ZD1 cathode ground connection.4 foot of test side of chip U1 connects the one end safety capacitor CX, the one end resistance R5 and the one end resistance R6, safety
Another termination transformer T1 primary side Np1 output end of capacitor CX, the resistance R5 other end and resistance R6 other end ground connection.The leakage of chip U1
Extreme 6 foot, 7 feet and 8 feet connect transformer T1 primary side Np2 output end.MOS switch pipe is carried inside chip U1, reduces electronics device
The quantity of part decreases other corresponding electronic devices, has saved cost.Metal-oxide-semiconductor built in chip U1 simultaneously, reduces MOS
The power consumption of pipe.Chip U1 exchange electrically activates, and power can dot in zero load for such circuit.
Switching diode D6 is passed through by the electric current of transformer T1 feedback winding Nb output end outflow, is filtered by capacitor C4
Then energy storage merges with the electric current from the direction current-limiting resistance R2 and flows to the power end of chip U1.Then chip U1 starting starts
Work, then chip U1 will control the on and off of its internal metal-oxide-semiconductor.The internal alternate on and off of metal-oxide-semiconductor makes directly
Galvanic electricity inversion is one-way communication electricity, and one-way communication electricity reaches transformer T1 pair side by transformer T1 primary side transformation again.Wherein chip
U1 power end acquires always the electric current of feedback winding output end, the electric current of chip U1 test side constant testing drain electrode, if the two
There is exception, chip U1 can then control metal-oxide-semiconductor cut-off.
Absorbing circuit includes resistance R3, R8, capacitor C3 and diode D5.Capacitor C3 and resistance R8 series connection, after series connection and
Resistance R7 is in parallel, the termination transformer T1 primary side input terminal after parallel connection, another terminating diode D5 cathode after parallel connection, diode
D5 cathode connecting transformer T1 primary side output end.Absorbing circuit can inhibit instantaneous overvoltage and overcurrent to power electronic equipment
Destruction, the switching loss of power electronic equipment can also be reduced.The main object of absorbing circuit protection is in the technical program
Transformer.
Secondary commutation filter circuit includes rectifier diode D7, D8, zener diode ZD2, resistance R6 and R9, filtered electrical
Hold C5, C7, C8 and C10, common mode inductance LF1 and filter inductance L2.Resistance R6 and capacitor C5 series connection, diode D7, D8 are the same as series connection
Resistance R6 and capacitor C5 afterwards is in parallel, and a termination transformer secondary output end after parallel connection, the other end is as secondary whole after parallel connection
Output end after stream.Capacitor C7, C10 and zener diode ZD2 three are in parallel, latter termination transformer secondary input terminal in parallel,
Output end, the one side common mode inductance LF1 and the one end inductance L2, common mode inductance LF1 after parallel connection after another termination secondary commutation is another
Side is connect with transformer secondary input terminal, the one end another terminating resistor R9 inductance L2 and the one end capacitor C8, the resistance R9 other end and
Capacitor C8 other end ground connection.Diode D7, D8 are rectifier diode SB3P45.Zener diode ZD2 make high voltage input and it is low
When voltage input, output loading over-current protection point is close consistent, will not severe deviations.
The electric current of transformer T1 pair side output first passes around secondary commutation filtering, and the output end of secondary commutation filtering is as suitable
The output end of orchestration.
Comparison circuit 40 include model TL431A voltage stabilizing chip U2, PC817C photo-coupler U3, resistance R7, R10, R11,
R12, R13, R15 and capacitor C9.The output end of chip U2 connects with the output pin of the input terminal of photo-coupler U3, resistance R15 with
The input terminal both sides of photo-coupler U3 are in parallel, the output after another termination secondary commutation of resistance R7 mono- terminating resistor R15, resistance R7
End.Resistance R10 and capacitor C9 series connection, it is in parallel with the output end of chip U2 and input terminal after series connection.Resistance R12 and R13 are in parallel, and
One end ground connection after connection, the input terminal of another chip termination U2 after parallel connection.1 foot of input terminal of mono- chip termination U2 of resistance R11,
The output end of another termination adapter of resistance R11.The output end output pin of photo-coupler U3 and the feedback port of chip U1 connect
It connects.
The output end of adapter provides operating voltage for comparison circuit, and chip U2 will stablize a reference voltage.Compare electric
Reference voltage is compared by road with the output voltage after secondary commutation, and comparison signal is exported by photo-coupler U3 to core
The feedback port of piece U1, then chip U1 controls the on and off of internal metal-oxide-semiconductor according to comparison signal.Feedback control with
Prevent the output of adapter abnormal, this ensure that adapter stablizes output.
Safety capacitor CY1 is connected between transformer primary side input terminal and secondary side output end.
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 (8)
1. a kind of switch power source adapter circuit, which is characterized in that including current rectifying and wave filtering circuit, absorbing circuit, switch control electricity
Road, transformer, secondary commutation filter circuit and comparison circuit；
The transformer includes primary side, secondary side and feedback winding, and electric current flows to secondary side by primary side, secondary current flow direction feedback around
Group；
The current rectifying and wave filtering circuit input terminal is connect with electric main, and the rectification filter circuit output end and transformer primary side are defeated
Outlet electrical connection, the absorbing circuit is in parallel with the output end of transformer primary side and input terminal, the transformer primary side output end
It is electrically connected with ON-OFF control circuit control signal；
The ON-OFF control circuit includes control chip U1, the control chip U1 built-in switch, the switch control transformer
The energization and power-off of primary side, the switch are connected with transformer primary side, and the ON-OFF control circuit power end passes through feedback winding
It being electrically connected with transformer secondary, the transformer secondary output end is electrically connected with secondary commutation filter circuit input terminal, and described time
Grade rectification filter circuit output end is as adapter output end, secondary commutation filter circuit output end and comparison circuit input terminal electricity
Connection；
Output end is set as reference voltage by the comparison circuit, and reference voltage and transformer secondary are exported electricity by the comparison circuit
Pressure is compared, and comparison signal is exported to the feedback input end of ON-OFF control circuit, the ON-OFF control circuit according to than
Compared with the closure of Signal-controlled switch.
2. switch power source adapter circuit as described in claim 1, which is characterized in that the current rectifying and wave filtering circuit includes unidirectional
Bridge rectifier and CLC filter circuit, the unidirectional bridge rectifier input terminal are connect with electric main, the unidirectional bridge
Formula rectification circuit output end is connect with CLC filter circuit input terminal, and the CLC filter circuit output end and transformer primary side input
End connection.
3. switch power source adapter circuit as described in claim 1, which is characterized in that the absorbing circuit include resistance R3,
R8, capacitor C3 and diode D5, the capacitor C3 and resistance R8 series connection, after series connection and resistance R7 is in parallel, one end after parallel connection
Connect transformer primary side input terminal, it is in parallel after another terminating diode D5 cathode, the diode D5 cathode connecting transformer primary side is defeated
Outlet.
4. switch power source adapter circuit as described in claim 1, which is characterized in that the ON-OFF control circuit includes model
LY6016 chip U1, switching diode D6, capacitor C4 and CX, resistance R1, R2, R5, R14 and R16, the resistance R1 and R2 go here and there
Connection, the power end of a chip termination U1 after series connection, another termination alternating current fire wire after series connection, the power supply termination of the chip U1
Capacitor C4 anode and diode D6 cathode, the capacitor C4 cathode ground connection, the diode D6 cathode connecting transformer feedback winding
Output end, one end grid terminating resistor R14 of the chip U1, the power end of another chip termination U1 of resistance R14 are described
The output end of the feedback termination comparison circuit of chip U1, one end detection termination capacitor CX of the chip U1, the one end resistance R5 and
The one end resistance R6, another termination transformer T1 primary side output end of capacitor CX, the resistance R5 other end and resistance R6 are another
The drain electrode of end ground connection, the chip U1 terminates transformer primary side output end.
5. switch power source adapter circuit as described in claim 1, which is characterized in that the secondary commutation filter circuit includes
Rectifier diode D7, D8, resistance R6 and R9, capacitor C5, C7, C8 and C10, common mode inductance LF1 and inductance L2, the resistance R6 and
Capacitor C5 series connection, the resistance R6 and capacitor C5 after the same series connection of described diode D7, D8 are in parallel, a termination transformer pair after parallel connection
Side output end, for the other end as the output end after secondary commutation, the capacitor C7 and C10 are in parallel after parallel connection, latter termination in parallel
Transformer secondary input terminal, output end, the one side common mode inductance LF1 and inductance L2 mono- after in parallel after another termination secondary commutation
End, the another side the common mode inductance LF1 connect with transformer secondary input terminal, described one end another terminating resistor R9 inductance L2 with
The one end capacitor C8, the resistance R9 other end and capacitor C8 other end ground connection.
6. switch power source adapter circuit as claimed in claim 5, which is characterized in that it further include zener diode ZD2, it is described
Zener diode ZD2 anode connects the output end after secondary commutation, and the zener diode ZD2 cathode connects transformer secondary input
End.
7. switch power source adapter circuit as described in claim 1, which is characterized in that the comparison circuit includes TL431A steady
Press chip U2, photo-coupler U3, resistance R7, R10, R11, R12, R13, R15 and capacitor C9, the output end and light of the chip U2
The output pin of the input terminal of coupler U3 connects, and the resistance R15 is in parallel with the input terminal of photo-coupler U3, the resistance R7 mono-
Terminating resistor R15, another termination transformer secondary output end of resistance R7, the resistance R10 and capacitor C9 series connection, after series connection
In parallel with the output end of chip U2 and input terminal, the resistance R12 and R13 are in parallel, one end ground connection after parallel connection, another after in parallel
The input terminal of chip termination U2, the input terminal of the mono- chip termination U2 of resistance R11, another termination adapter of resistance R11
Output end, the output end output pin of the photo-coupler U3 connect with the feedback input end of chip U1.
8. switch power source adapter circuit as described in claim 1, which is characterized in that including safety capacitor CY1, the safety
Capacitor CY1 mono- terminates transformer primary side input terminal, another termination transformer secondary input terminal of safety capacitor CY1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822120460.4U CN209389952U (en) | 2018-12-18 | 2018-12-18 | Switch power source adapter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822120460.4U CN209389952U (en) | 2018-12-18 | 2018-12-18 | Switch power source adapter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209389952U true CN209389952U (en) | 2019-09-13 |
Family
ID=67872440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822120460.4U Expired - Fee Related CN209389952U (en) | 2018-12-18 | 2018-12-18 | Switch power source adapter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209389952U (en) |
-
2018
- 2018-12-18 CN CN201822120460.4U patent/CN209389952U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190913 |
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| CF01 | Termination of patent right due to non-payment of annual fee |