CN209389938U - Low loss switching power supply adaptor - Google Patents
Low loss switching power supply adaptor Download PDFInfo
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- CN209389938U CN209389938U CN201822120615.4U CN201822120615U CN209389938U CN 209389938 U CN209389938 U CN 209389938U CN 201822120615 U CN201822120615 U CN 201822120615U CN 209389938 U CN209389938 U CN 209389938U
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Abstract
The utility model discloses a kind of low loss switching power supply adaptors, 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.Low loss switching power supply adaptor provided by the utility model reduces switching loss by switching switching frequency.
Description
Technical field
The utility model relates to adapter fields, specifically, being related to a kind of low loss switching power supply adaptor.
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.Existing power supply adaptor is substantially switch power source adapter, switch power source adapter effect
Rate is high, low in energy consumption.Since in switch power source adapter, switching device is cut-off with certain frequency, so that is opened
It closes device and has more switching loss during cut-offfing.
Utility model content
The purpose of this utility model is to provide a kind of low loss switching power supply adaptors to be subtracted by switching switching frequency
Few switching loss.
Technical solution used by low loss switching power supply adaptor disclosed by the utility model is:
A kind of low loss switching power supply adaptor, including current rectifying and wave filtering circuit, absorbing circuit, ON-OFF control circuit, transformation
Device, secondary commutation filter circuit and feed 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 control chip U1
According to the Frequency Smooth of load control switch reduce, the energization and power-off of the switch control transformer primary side, it is described switch with
Transformer primary side series connection, the ON-OFF control circuit power end are electrically connected by feedback winding with transformer secondary, the transformation
Device pair side output end is electrically connected with secondary commutation filter circuit input terminal, and the secondary commutation filter circuit output end is as adaptation
Device output end, secondary commutation filter circuit output end are electrically connected with feed circuit input terminal；
Output end is set as reference voltage by the feed circuit, and the feed 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 capacitor C1, the unidirectional bridge
Formula rectification circuit input end is connect with electric main, and the capacitor C1 is in parallel with unidirectional bridge rectifier output end.
Preferably, the absorbing circuit includes resistance R2, capacitor C3 and diode D8, the capacitor C3 and resistance
R2 series connection, a termination rectification filter circuit output end, another terminating diode D8 cathode, the diode after series connection after series connection
D8 cathode connecting transformer primary side output end.
Preferably, the ON-OFF control circuit includes model C R5249 chip U1, switching diode D5, capacitor
C2, resistance R5, R6 and R7,1 one end foot connecting resistance R6 of gate terminal of the chip U1, another chip termination U1's of resistance R6
2 foot of power end, 2 foot of power end of the chip U1 connect capacitor C2 anode and diode D5 cathode, and the capacitor C2 cathode is grounded,
Described one end diode D5 anode connecting resistance R5, another termination transformer feedback winding output end of resistance R5, the chip
3 foot of U1 feedback end connects feedback circuit output, 4 one end foot connecting resistance R7 of test side of the chip U1, and the resistance R7 is another
End ground connection, 5 foot of drain electrode end of the chip U1 and 6 feet connect transformer primary side output end.
Preferably, the secondary commutation filter circuit includes diode D6, D7, resistance R8, filter capacitor C4, C6
And C7, the resistance R8 and capacitor C4 series connection, the resistance R8 and capacitor C4 after the same series connection of described diode D6, D7 are in parallel, in parallel
A termination transformer secondary output end, the one end another termination capacitor C6 and the one end capacitor C7 after parallel connection, the capacitor C6 are another later
One end ground connection, the capacitor C7 other end ground connection.
Preferably, feed circuit model TL431 the voltage stabilizing chip U3, photo-coupler U2, resistance R9, R10,
R12, R13, R14, R15 and capacitor C8, the output end of the chip U3 connect with the output pin of the input terminal of photo-coupler U2,
The resistance R10 is in parallel with the input terminal of photo-coupler U3, the mono- terminating resistor R10 of resistance R9, the resistance R10 other end
The output end of transformer secondary, the resistance R12 and capacitor C8 series connection are connect, after series connection simultaneously with the output end of chip U3 and input terminal
Connection, the resistance R14 and R15 are in parallel, one end ground connection after parallel connection, the input terminal of another chip termination U3, the electricity after parallel connection
The input terminal of resistance mono- chip termination U3 of R13, the output end of another termination adapter of resistance R13, the photo-coupler U2's
Output end output pin is connect with the feedback input end of chip U1.
It preferably, further include safety capacitor CY1, the safety capacitor CY1 mono- terminates transformer feedback winding
Input terminal, another termination transformer secondary input terminal of safety capacitor CY1.
The beneficial effect of low loss switching power supply adaptor disclosed by the utility model is: when the load of power supply is reduced,
The Frequency Smooth for controlling chip U1 control switch reduces, and in this way due to the reduction of frequency, switching loss is also effectively reduced.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model low loss switching power supply adaptor.
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 low loss switching power supply adaptor includes current rectifying and wave filtering circuit 10, absorbing circuit 20, switch
Control circuit 30, transformer T1, secondary commutation filter circuit 40 and feed circuit 50.
Transformer T1 includes primary side, secondary side and feedback winding.1 foot of transformer T1 to 2 feet be primary side, the 3 of transformer T1
Foot is feedback winding to 4 feet, and 5 feet to 6 feet of transformer T1 are secondary side.Electric current flows to secondary side by primary side, and secondary current flows to again
Feedback winding.
After electric main is come in, current rectifying and wave filtering circuit is first passed around.Electric main is converted to direct current by current rectifying and wave filtering circuit
Electricity.
Current rectifying and wave filtering circuit includes unidirectional bridge rectifier BD1 and capacitor C1.Unidirectional bridge rectifier BD1 is by 4
Rectifier diode composition, for converting alternating current to direct current.Direct current is used as rectification after filtering using electrolytic capacitor C1
The output of filter circuit.
Fuse F1 is wherein in series between alternating current and rectification circuit, alternating current both ends are parallel with varistor MOV1.
Surge can be absorbed in current-limiting protection element of the fuse F1 as circuit, varistor MOV1, the voltage-limiting protection member as circuit
Part.Alternating current needs to filter out clutter and the interference in alternating current by common mode inductance LF1 before by current rectifying and wave filtering circuit.Firewire
Safety capacitor CX1, resistance R1 and R1A are in series between zero curve.
The input terminal of current direction transformer T1 primary side after rectifying and wave-filtering and the one end capacitor C9, capacitor C9 other end warp
It crosses current-limiting resistance R3 and R4 and flows to ON-OFF control circuit power end again.
ON-OFF control circuit includes model C R5249 chip U1, switching diode D5, capacitor C2, resistance R5, R6 and R7.Core
1 one end foot connecting resistance R6 of gate terminal of piece U1,2 foot of power end of another chip termination U1 of resistance R6.The power end 2 of chip U1
Foot connects filtering storage capacitor C2 anode and diode D5 cathode, and capacitor C2 cathode is grounded, the one end diode D5 anode connecting resistance R5,
Another termination transformer T1 feedback winding output end of resistance R5.3 foot of feedback end of chip U1 connects feedback circuit output.Chip U1
4 foot of test side connect the one end sampling resistor R7, resistance R7 other end ground connection.5 foot of drain electrode end of chip U1 and 6 feet meet transformer T1
Primary side output end.7 foot of ground terminal of chip U1 and 8 feet connect the one end safety capacitor CY1, another termination transformer of safety capacitor CY1
Secondary side input terminal.MOS switch pipe is carried inside chip U1, reduces the quantity of electronic device, decreases other corresponding electricity
Sub- device, has saved cost.Metal-oxide-semiconductor built in chip U1 simultaneously, reduces the power consumption of metal-oxide-semiconductor.Wherein resistance R5 and R6 is patch
Resistance.
Switching diode D6 is passed through by the electric current of transformer T1 feedback winding Nb output end outflow, is filtered by capacitor C2
Then energy storage merges with the electric current from the direction current-limiting resistance R3 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 reflux, if the two
There is exception, chip U1 can then control metal-oxide-semiconductor cut-off.
Chip U1 can work in three kinds of different modes, and each pattern all optimizes.When loading very heavy, it is
Work unite in traditional PWM (pulse width modulation) mode.When load lightens, system enters PFM (pulse frequency modulated) mould
Formula.Under PFM mode, with gradually lightening for load, switching frequency also gradually reduces.Frequency translation module in chip U1
Can make switching frequency smoothly reduces or rises without generating noise.Due to the reduction of switching frequency, switching loss is also effective
Reduce.When load continues reduction and is lower than a certain setting value, system enters PSM (frequency hopping modulation) mode.In PSM mode
Under, some switch periods are skipped, and switching tube complete switches off in these periods, therefore this mode can further decrease standby function
Consumption.Under three kinds of above-mentioned operating modes, it is all integrated with frequency jittering function, carrys out the EMI characteristic of lifting system.
In order to ensure the normal work of system, the built-in multiple protection measure of chip U1.These safeguard measures include by week
The current limit of phase, peak point current limitation, overheat protector, overload protection, overvoltage protection, SENSE open-circuit-protection, under-voltage locking
Deng.These safeguard measures are integrated in control chip U1, can greatly simplify circuit structure, reduce cost.
Absorbing circuit includes resistance R2, capacitor C3 and diode D8.Capacitor C3 and resistance R2 series connection, a termination after series connection
The one end capacitor C9, another terminating diode D8 cathode after series connection, diode D8 cathode connecting transformer T1 primary side output end.Absorb electricity
Road can inhibit the destruction of instantaneous overvoltage and overcurrent to power electronic equipment, can also reduce opening for power electronic equipment
Close loss.The main object that absorbing circuit is protected in the technical program is transformer.
Secondary commutation filter circuit includes rectifier diode D6, D7, resistance R8, filter capacitor C4, C6 and C7.Resistance R8
It connects with capacitor C4, the resistance R8 and capacitor C4 after the same series connection of diode D6, D7 are in parallel, a termination transformer T1 pair after parallel connection
Side output end, the other end is as the output end after secondary commutation after parallel connection.Electric current after secondary commutation by electrolytic capacitor C6 and
Output end after C7, inductance LR1 filtering as adapter.Diode D7, D8 are rectifier diode SB3100.Wherein resistance R8
For Chip-R.
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.
Feed circuit include model TL431 voltage stabilizing chip U3, PC817 photo-coupler U2, resistance R9, R10, R12, R13,
R14, R15 and capacitor C8.The output end of chip U3 connects with the output pin of the input terminal of photo-coupler U2.Resistance R10 and optocoupler
The input terminal both sides of clutch U3 are in parallel, the output end after another termination secondary commutation of resistance R9 mono- terminating resistor R10, resistance R9.
Resistance R12 and capacitor C8 series connection, it is in parallel with the output end of chip U3 and input terminal after series connection.Resistance R14 and R15 are in parallel, in parallel
One end ground connection afterwards, the input terminal of another chip termination U3 after parallel connection.The input terminal of mono- chip termination U3 of resistance R13, resistance R13
The output end of another termination adapter.The output end output pin of photo-coupler U2 is connect with the feedback port of chip U1.It is wherein electric
Hindering R9, R12, R13, R14 and R15 is Chip-R.
The output end of adapter provides operating voltage for comparison circuit, and chip U3 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 U2 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.
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 low loss switching power supply adaptor, which is characterized in that including current rectifying and wave filtering circuit, absorbing circuit, switch control
Circuit, transformer, secondary commutation filter circuit and feed 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 include control chip U1, the control chip U1 built-in switch, the control chip U1 according to
The Frequency Smooth of load control switch reduces, the energization and power-off of the switch control transformer primary side, the switch and transformation
The series connection of device primary side, the ON-OFF control circuit power end are electrically connected by feedback winding with transformer secondary, the transformer pair
Side output end is electrically connected with secondary commutation filter circuit input terminal, and the secondary commutation filter circuit output end is defeated as adapter
Outlet, secondary commutation filter circuit output end are electrically connected with feed circuit input terminal；
Output end is set as reference voltage by the feed circuit, and reference voltage and transformer secondary are exported electricity by the feed 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. low loss switching power supply adaptor as described in claim 1, which is characterized in that the current rectifying and wave filtering circuit includes single
To bridge rectifier and capacitor C1, the unidirectional bridge rectifier input terminal is connect with electric main, the capacitor C1 with
Unidirectional bridge rectifier output end is in parallel.
3. low loss switching power supply adaptor as described in claim 1, which is characterized in that the absorbing circuit includes resistance
R2, capacitor C3 and diode D8, the capacitor C3 and resistance R2 series connection, a termination rectification filter circuit output end after series connection,
Another terminating diode D8 cathode after series connection, the diode D8 cathode connecting transformer primary side output end.
4. low loss switching power supply adaptor as described in claim 1, which is characterized in that the ON-OFF control circuit includes type
Number CR5249 chip U1, switching diode D5, capacitor C2, resistance R5, R6 and R7, the 1 foot connecting resistance of gate terminal of the chip U1
The one end R6,2 foot of power end of another chip termination U1 of resistance R6,2 foot of power end of the chip U1 connect capacitor C2 anode
With diode D5 cathode, the capacitor C2 cathode is grounded, described one end diode D5 anode connecting resistance R5, and the resistance R5 is another
Transformer feedback winding output end is terminated, 3 foot of chip U1 feedback end connects feedback circuit output, the detection of the chip U1
4 one end foot connecting resistance R7 are held, the resistance R7 other end ground connection, 5 foot of drain electrode end of the chip U1 and 6 feet connect transformer primary side
Output end.
5. low loss switching power supply adaptor as described in claim 1, which is characterized in that the secondary commutation filter circuit packet
Include diode D6, D7, resistance R8, filter capacitor C4, C6 and C7, the resistance R8 and capacitor C4 series connection, described diode D6, D7
Resistance R8 and capacitor C4 after same series connection is in parallel, a termination transformer secondary output end after parallel connection, another termination electricity after parallel connection
Hold the one end C6 and the one end capacitor C7, the capacitor C6 other end ground connection, the capacitor C7 other end ground connection.
6. low loss switching power supply adaptor as described in claim 1, which is characterized in that the feed circuit model TL431
Voltage stabilizing chip U3, photo-coupler U2, resistance R9, R10, R12, R13, R14, R15 and capacitor C8, the output end of the chip U3 with
The output pin of the input terminal of photo-coupler U2 connects, and the resistance R10 is in parallel with the input terminal of photo-coupler U3, the resistance R9
One terminating resistor R10, the output end of another termination transformer secondary of resistance R10, the resistance R12 and capacitor C8 series connection,
In parallel with the output end of chip U3 and input terminal after series connection, the resistance R14 and R15 are in parallel, one end ground connection after parallel connection, in parallel
The input terminal of another chip termination U3 afterwards, the input terminal of the mono- chip termination U3 of resistance R13, another termination of resistance R13
The output end output pin of the output end of adapter, the photo-coupler U2 is connect with the feedback input end of chip U1.
7. low loss switching power supply adaptor as described in claim 1, which is characterized in that it further include safety capacitor CY1, it is described
Safety capacitor CY1 mono- terminates the input terminal of transformer feedback winding, another termination transformer secondary input of safety capacitor CY1
End.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822120615.4U CN209389938U (en) | 2018-12-18 | 2018-12-18 | Low loss switching power supply adaptor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822120615.4U CN209389938U (en) | 2018-12-18 | 2018-12-18 | Low loss switching power supply adaptor |
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| Publication Number | Publication Date |
|---|---|
| CN209389938U true CN209389938U (en) | 2019-09-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822120615.4U Expired - Fee Related CN209389938U (en) | 2018-12-18 | 2018-12-18 | Low loss switching power supply adaptor |
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| Country | Link |
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| CN (1) | CN209389938U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021068703A1 (en) * | 2019-10-11 | 2021-04-15 | 珠海格力电器股份有限公司 | Power supply control circuit and electrical device |
-
2018
- 2018-12-18 CN CN201822120615.4U patent/CN209389938U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021068703A1 (en) * | 2019-10-11 | 2021-04-15 | 珠海格力电器股份有限公司 | Power supply control circuit and electrical device |
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| GR01 | Patent grant | ||
| 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 |