CN208337432U - Switching Power Supply - Google Patents

Switching Power Supply Download PDF

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Publication number
CN208337432U
CN208337432U CN201821019997.5U CN201821019997U CN208337432U CN 208337432 U CN208337432 U CN 208337432U CN 201821019997 U CN201821019997 U CN 201821019997U CN 208337432 U CN208337432 U CN 208337432U
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circuit
power supply
capacitor
electrically
auxiliary
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CN201821019997.5U
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Chinese (zh)
Inventor
杨兴建
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Guangzhou Shiyuan Electronics Thecnology Co Ltd
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Guangzhou Shiyuan Electronics Thecnology Co Ltd
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Abstract

The application provides a kind of Switching Power Supply, including current rectifying and wave filtering circuit, transforming circuit and energy compensating circuit.Current rectifying and wave filtering circuit includes rectification circuit and the first capacitor that connect with the rectification circuit, and the first capacitor includes thin-film capacitor, and the current rectifying and wave filtering circuit carries out rectifying and wave-filtering to the alternating current of input.Transforming circuit is electrically connected with the current rectifying and wave filtering circuit, carries out transformation to the voltage of current rectifying and wave filtering circuit output.Energy compensating circuit is electrically connected with the first capacitor and the transforming circuit, and at least part power compensation that the transforming circuit is exported gives the first capacitor.

Description

Switching Power Supply
Technical field
This application involves appliance field more particularly to a kind of Switching Power Supplies.
Background technique
Switching Power Supply is that alternating current is converted to a kind of power supply stabilized the output voltage, is widely used in industrial automation control In the fields such as system, household appliance, Medical Devices.
The capacitor used in the current rectifying and wave filtering circuit of existing Switching Power Supply is electrolytic capacitor.The electrolyte of electrolytic capacitor With combustibility, there are potential security risks.
Utility model content
The application provides a kind of Switching Power Supply, can reduce security risk.
The application provides a kind of Switching Power Supply, comprising:
Current rectifying and wave filtering circuit, including rectification circuit and the first capacitor being connect with the rectification circuit, the first capacitor Including thin-film capacitor, the current rectifying and wave filtering circuit carries out rectifying and wave-filtering to the alternating current of input;
Transforming circuit is electrically connected with the current rectifying and wave filtering circuit, is become to the voltage of current rectifying and wave filtering circuit output Pressure;
Energy compensating circuit is electrically connected with the first capacitor and the transforming circuit, and the transforming circuit is exported At least part power compensation gives the first capacitor.
Further, the transforming circuit includes isolating transformer and auxiliary power supply circuit;
The isolating transformer include armature winding and the secondary windings coupled respectively with the armature winding and auxiliary around Group;The armature winding is electrically connected with the first capacitor, the electricity after the secondary windings and auxiliary winding output transformation Pressure;
The auxiliary power supply circuit is electrically connected with the auxiliary winding, receives the electric energy of the auxiliary winding, and with it is described The electrical connection of energy compensating circuit, at least part electric energy of the auxiliary winding is by the energy compensating circuit compensation to described First capacitor.
Further, the energy compensating circuit includes first diode;
The anode of the first diode is electrically connected with the auxiliary power supply circuit, the cathode of the first diode and institute State first capacitor electrical connection.
Further, the Switching Power Supply includes control circuit, and the control circuit is electrically connected with the transforming circuit, control Make the transforming circuit;The auxiliary power supply circuit is electrically connected to the control circuit, and is powered to the control circuit.
Further, the energy compensating circuit connection is in the connection of the auxiliary power supply circuit and the control circuit Place.
Further, the energy compensating circuit connection is in the connection of the auxiliary power supply circuit and the auxiliary winding Place.
Further, the auxiliary power supply circuit includes the second diode and the second electricity with second Diode series Hold;
The anode of second diode is electrically connected with the auxiliary winding, the cathode of second diode and described the The electrical connection of two capacitors;The energy compensating circuit connection is in the cathode of second diode.
Further, the control circuit includes controller and switching tube;
The controller is electrically connected with the control terminal of the switching tube, controls cut-offfing for the switching tube, and the switch Pipe is electrically connected with the armature winding.
Further, the switching tube includes field effect transistor;The grid of the field effect transistor is control terminal, with The controller electrical connection, source electrode are electrically connected the armature winding, grounded drain.
Further, the Switching Power Supply includes the RCD absorbing circuit connecting with the armature winding and the switching tube.
The technical solution that embodiments herein provides can include the following benefits:
The first capacitor used in the current rectifying and wave filtering circuit of Switching Power Supply provided by the present application includes thin-film capacitor, with electrolysis The problem of capacitor is compared, and thin-film capacitor is revealed there is no electrolyte, can reduce security risk.
Detailed description of the invention
Fig. 1 show the circuit diagram of one embodiment of the application Switching Power Supply;
The voltage oscillogram of first capacitor when Fig. 2 show transforming circuit not to first capacitor electric energy supplement;
The voltage oscillogram of first capacitor when Fig. 3 show transforming circuit to first capacitor electric energy supplement;
Fig. 4 show the structural schematic diagram of one embodiment of the application Switching Power Supply.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment Described in embodiment do not represent all embodiments consistent with the application.On the contrary, they be only with it is such as appended The example of the consistent device of some aspects be described in detail in claims, the application.
It is only to be not intended to be limiting the application merely for for the purpose of describing particular embodiments in term used in this application. Unless otherwise defined, technical term or scientific term used in this application, which are should be in fields of the present invention, has general skill The ordinary meaning that the personage of energy is understood." first " " second " and class used in present specification and claims As word be not offered as any sequence, quantity or importance, and be used only to distinguish different component parts.Equally, " one It is a " or the similar word such as " one " do not indicate that quantity limits yet, but indicate that there are at least one." multiple " or " several " table Show two and two or more.The similar word such as " comprising " or "comprising" means to appear in the member before " comprising " or "comprising" Part or object are covered the element for appearing in " comprising " or "comprising" presented hereinafter or object and its are equal, it is not excluded that its His element or object." connection " either the similar word such as " connected " is not limited to physics or mechanical connection, and And may include electrical connection, it is either direct or indirect.In present specification and the appended claims The "an" of used singular, " described " and "the" are also intended to including most forms, unless context clearly shows that Other meanings.It is also understood that term "and/or" used herein refers to and includes one or more associated to list item Purpose any or all may combine.
Switching Power Supply provided by the embodiments of the present application includes current rectifying and wave filtering circuit, transforming circuit and energy compensating circuit.It is whole Flow the first capacitor that filter circuit includes rectification circuit and is connected with the rectifying circuit.First capacitor includes thin-film capacitor.Rectification filter Wave circuit carries out rectifying and wave-filtering to the alternating current of input.Transforming circuit is electrically connected with current rectifying and wave filtering circuit, to current rectifying and wave filtering circuit The voltage of output carries out transformation.Energy compensating circuit is electrically connected with first capacitor and transforming circuit, extremely by transforming circuit output Few a part of power compensation is to first capacitor.
The first capacitor used in the current rectifying and wave filtering circuit of the Switching Power Supply of the embodiment of the present application includes thin-film capacitor, with electricity Solution capacitor is compared, and thin-film capacitor can reduce security risk;At least part for being exported transforming circuit using energy compensating circuit The minimum voltage of first capacitor can be improved to first capacitor in power compensation, reduces the ripple of the electric energy of Switching Power Supply output.
Fig. 1 show the circuit diagram of one embodiment of Switching Power Supply 10.Switching Power Supply 10 provided by the embodiments of the present application Including current rectifying and wave filtering circuit 11, transforming circuit 12 and energy compensating circuit 13.Switching Power Supply 10 further includes control circuit 14.
The alternating current of 11 pairs of current rectifying and wave filtering circuit inputs carries out rectifying and wave-filtering.Current rectifying and wave filtering circuit 11 includes rectification circuit The 111 and first capacitor C1 that is connect with rectification circuit 111.The alternating current of 11 pairs of current rectifying and wave filtering circuit inputs carries out rectifying and wave-filtering, Output ripple direct current.Alternating current can be alternating current.In one embodiment, rectification circuit 111 includes bridge rectifier, bridge-type Rectification circuit includes diode D1, D2, D3 and D4.In other embodiments, the rectification circuit of other forms can also be used.First Capacitor C1 filters out the ripple of the voltage of the output of rectification circuit 111.First capacitor C1 includes thin-film capacitor.Compared with electrolytic capacitor, The problem of thin-film capacitor is revealed there is no electrolyte, can reduce security risk.
Transforming circuit 12 is electrically connected with current rectifying and wave filtering circuit 11, carries out transformation to the voltage of 11 circuit output of rectifying and wave-filtering. Transforming circuit 12 includes isolating transformer 121 and auxiliary power supply circuit 122.
Isolating transformer 121 include armature winding L1 and the secondary windings L2 that couple respectively with armature winding L1 and assist around Group L3.Armature winding L1 is electrically connected with first capacitor C1, and secondary windings L2 and auxiliary winding L3 export the voltage after transformation.One In embodiment, the different name end of armature winding L1 is electrically connected with one end of first capacitor C1, the other end ground connection of first capacitor C1.It is secondary The different name end ground connection of grade winding L2.The different name end of auxiliary winding L3 is grounded.
Auxiliary power supply circuit 122 is electrically connected with auxiliary winding L3, receives the electric energy of auxiliary winding L3 output.In an embodiment In, auxiliary power supply circuit 122 include the second diode D7 and with the concatenated second capacitor E2 of the second diode D7.Second diode The anode of D7 is electrically connected with the Same Name of Ends of auxiliary winding L3, and the cathode of the second diode D7 is connect with one end of the second capacitor E2, The other end of second capacitor E2 is grounded.In the illustrated embodiment, the second capacitor E2 be electrolytic capacitor, the second capacitor E2 anode with The cathode of second diode D7 connects, the cathode ground connection of the second capacitor E2.
Control circuit 14 is electrically connected with transforming circuit 12, controls transforming circuit 12.Auxiliary power supply circuit 122 and control circuit 14 electrical connections, power to control circuit 14.Control circuit 14 includes controller 141 and switching tube Q1.The control terminal of switching tube Q1 It is electrically connected with controller 141, one end of switching tube Q1 is electrically connected with the Same Name of Ends of armature winding L1, another termination of switching tube Q1 Ground.When 141 control switch pipe Q1 of controller conducting, first capacitor C1, armature winding L1 and switching tube Q1 forming circuit, first Capacitor C1 electric discharge, armature winding L1 are powered.When 141 control switch pipe Q1 of controller by when, first capacitor C1, armature winding L1 It is disconnected with the circuit that switching tube Q1 is formed, first capacitor C1 stops electric discharge, armature winding L1 no power.
In one embodiment, controller 141 is PWM controller, and PWM controller is by output pwm signal come control switch The on or off of pipe Q1.In one embodiment, switching tube Q1 includes field effect transistor.The grid of field effect transistor is control End processed is connect with controller 141, and source electrode is electrically connected with the Same Name of Ends of armature winding L1, grounded drain.In one embodiment, Control circuit 14 further includes current-limiting resistance R1.One end of current-limiting resistance R1 is electrically connected in the output end of switching tube Q1, another termination Ground.Electric current when current-limiting resistance R1 limit switch pipe Q1 is connected.
Energy compensating circuit 13 is electrically connected with first capacitor C1 and transforming circuit 12, at least one that transforming circuit 12 is exported Part power compensation gives first capacitor C1.Energy compensating circuit 13 includes first diode D6.First diode D6 anode with Transforming circuit 12 is electrically connected, and the cathode of first diode D6 is electrically connected with first capacitor C1.The cathode of first diode D6 connects In the one end at the different name end of first capacitor C1 connection armature winding L1.In one embodiment, energy compensating circuit 13 is connected to auxiliary The junction of power supply circuit 122 and control circuit 14 is helped, auxiliary power supply circuit 122 is simultaneously to energy compensating circuit 13 and control electricity Road 14 provides electric energy.In one embodiment, energy compensating circuit 13 is connected to the cathode of the second diode D7.As first capacitor C1 When electric discharge, the voltage at the different name end of armature winding L1 is higher than the voltage of Same Name of Ends.The auxiliary winding L3 coupled with armature winding L1 Different name end voltage be higher than Same Name of Ends voltage, the second diode D7 cut-off, armature winding L1 store electric energy, the second capacitor E2 Discharge anode power supply of the electric energy to first diode D6.The voltage of first diode D6 anode is higher than the voltage of first capacitor C1 When, first diode D6 conducting, the second capacitor E2 carries out power compensation to first capacitor C1.
When first capacitor C1 stops discharging, the energy of armature winding L1 storage is discharged into secondary windings L2 and auxiliary winding L3.The voltage of the Same Name of Ends of auxiliary winding L3 is higher than the voltage at different name end, and the second diode D7 is connected, and one of auxiliary winding L3 Divide anode power supply of the electric energy to first diode D6, another part electric energy is used to charge to the second capacitor E2.Work as first diode When the voltage of the anode of D6 is higher than the voltage of first capacitor C1, first diode D6 conducting, the second capacitor E2 is to first capacitor C1 Carry out power compensation.
In another embodiment, energy compensating circuit 13 may connect to auxiliary power supply circuit 122 and auxiliary winding L3 Junction, energy compensating circuit 13 directly obtain electric energy from auxiliary winding L3.The anode of first diode D6 can be directly connected to auxiliary Help the Same Name of Ends of winding L3.
Fig. 2 be transforming circuit 12 not to first capacitor C1 electric energy supplement when first capacitor C1 voltage oscillogram, Fig. 3 is to become Volt circuit 12 by energy compensating circuit 13 to first capacitor C1 electric energy supplement when first capacitor C1 voltage oscillogram.Comparison diagram The minimum voltage of first capacitor C1 can be improved it is found that by increasing energy compensating circuit 13 in 2 and Fig. 3.The embodiment of the present application In, the size of the output voltage of auxiliary winding L3 can be adjusted by adjusting the coil turn of auxiliary winding L3, and then adjust to The electric energy of first capacitor C1 compensation, to adjust the minimum voltage of first capacitor C1.
Switching Power Supply 10 includes the RCD absorbing circuit 15 connecting with armature winding L1 and switching tube Q1.RCD absorbing circuit 15 include third diode D5, third capacitor C2 and absorption resistance R2.The anode of third diode D5 be connected to switching tube Q1 and One end of armature winding L1 connection, the anode connection of the cathode and third capacitor C2 of third diode D5.Third capacitor C2's is negative Pole is connected with armature winding L1.Absorption resistance R2 and third diodes in parallel D5.When 141 control switch pipe Q1 of controller ends When, the induced voltage that the armature winding L1 of isolating transformer 121 is generated can be made up of third diode D5 and absorption resistance R2 Circuit discharges, and ceiling voltage when limit switch pipe Q1 ends prevents switching tube Q1 from damaging when ending because of over-voltage.
Switching Power Supply 10 further includes the output rectifier and filter 16 connecting with secondary windings L2.Output rectifier and filter The Rectified alternating current of 16 pairs of secondary windings L2 outputs carries out rectifying and wave-filtering, exports stable DC.Output rectifier and filter 16 include rectification circuit 161 and the 4th capacitor E3 being electrically connected with rectification circuit 161.In one embodiment, rectification circuit 161 The 4th diode D8 being connected in parallel including two.The anode of 4th capacitor E3 is connect with rectification circuit electricity 161, cathode ground connection.
Referring to fig. 4, Switching Power Supply 10 further includes the output port 17 being electrically connected with output rectifier and filter 16.Output end Mouth 17 is connected with load, and the secondary windings L2 direct current exported is supplied to load.
Switching Power Supply 10 further includes the feed circuit 18 for connecting output port 17 and controller 141.Feed circuit 18 acquires The size of current that output port 17 exports, and the duty ratio of the size of current control controller 141 exported according to output port 17, To the time ratio of 141 control switch pipe Q1 on and off of controller, so that the voltage of secondary windings L2 to load output is full Foot requires.
Switching Power Supply 10 further include connect current rectifying and wave filtering circuit 11 EMI (ElectroMagnetic Interference, Electromagnetic interference) circuit 19.EMI circuit 19 filters out the various interference signals come in by power grid, prevents interference signal to equipment and answers It is interfered with environment.
The above is only the preferred embodiment of the application, not does limitation in any form to the application, though Right the application has been disclosed in a preferred embodiment above, however is not limited to the application, any technology people for being familiar with this profession Member, in the range of not departing from technical scheme, when the technology contents using the disclosure above are modified or are repaired Decorations are the equivalent embodiment of equivalent variations, but all contents without departing from technical scheme, the technology according to the application are real Matter any simple modification, equivalent change and modification to the above embodiments, still fall within the range of technical scheme It is interior.
The foregoing is merely the preferred embodiments of the application, not to limit the application, all essences in the application Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the application protection.

Claims (10)

1. a kind of Switching Power Supply characterized by comprising
Current rectifying and wave filtering circuit, including rectification circuit and the first capacitor connecting with the rectification circuit, the first capacitor includes Thin-film capacitor, the current rectifying and wave filtering circuit carry out rectifying and wave-filtering to the alternating current of input;
Transforming circuit is electrically connected with the current rectifying and wave filtering circuit, carries out transformation to the voltage of current rectifying and wave filtering circuit output;
Energy compensating circuit is electrically connected with the first capacitor and the transforming circuit, and the transforming circuit is exported at least A part of power compensation gives the first capacitor.
2. Switching Power Supply according to claim 1, which is characterized in that the transforming circuit includes isolating transformer and auxiliary Power supply circuit;
The isolating transformer includes armature winding and the secondary windings coupled respectively with the armature winding and auxiliary winding;Institute It states armature winding to be electrically connected with the first capacitor, the voltage after the secondary windings and auxiliary winding output transformation;
The auxiliary power supply circuit is electrically connected with the auxiliary winding, receives the electric energy of the auxiliary winding, and with the energy At least part electric energy of compensation circuit electrical connection, the auxiliary winding gives described first by the energy compensating circuit compensation Capacitor.
3. Switching Power Supply according to claim 2, which is characterized in that the energy compensating circuit includes first diode;
The anode of the first diode is electrically connected with the auxiliary power supply circuit, the cathode of the first diode and described the The electrical connection of one capacitor.
4. Switching Power Supply according to claim 2, which is characterized in that the Switching Power Supply includes control circuit, the control Circuit processed is electrically connected with the transforming circuit, controls the transforming circuit;The auxiliary power supply circuit and control circuit electricity Connection is powered to the control circuit.
5. Switching Power Supply according to claim 4, which is characterized in that the energy compensating circuit connection is supplied in the auxiliary The junction of circuit and the control circuit.
6. Switching Power Supply according to claim 2, which is characterized in that the energy compensating circuit connection is supplied in the auxiliary The junction of circuit and the auxiliary winding.
7. Switching Power Supply according to claim 2 or 5, which is characterized in that the auxiliary power supply circuit includes the two or two pole Pipe and the second capacitor with second Diode series;
The anode of second diode is electrically connected with the auxiliary winding, the cathode of second diode and second electricity Hold electrical connection;The energy compensating circuit connection is in the cathode of second diode.
8. Switching Power Supply according to claim 4, which is characterized in that the control circuit includes controller and switching tube;
The controller is electrically connected with the control terminal of the switching tube, controls cut-offfing for the switching tube, and the switching tube with The armature winding electrical connection.
9. Switching Power Supply according to claim 8, which is characterized in that the switching tube includes field effect transistor;It is described The grid of field effect transistor is control terminal, is electrically connected with the controller, and source electrode is electrically connected the armature winding, and drain electrode connects Ground.
10. Switching Power Supply according to claim 8, which is characterized in that the Switching Power Supply includes and the armature winding The RCD absorbing circuit connected with the switching tube.
CN201821019997.5U 2018-06-28 2018-06-28 Switching Power Supply Active CN208337432U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201821019997.5U CN208337432U (en) 2018-06-28 2018-06-28 Switching Power Supply

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Application Number Priority Date Filing Date Title
CN201821019997.5U CN208337432U (en) 2018-06-28 2018-06-28 Switching Power Supply

Publications (1)

Publication Number Publication Date
CN208337432U true CN208337432U (en) 2019-01-04

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Application Number Title Priority Date Filing Date
CN201821019997.5U Active CN208337432U (en) 2018-06-28 2018-06-28 Switching Power Supply

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110518806A (en) * 2019-09-27 2019-11-29 北京机械设备研究所 A kind of MOSFET series circuit for high input voltage reverse exciting switching voltage regulator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110518806A (en) * 2019-09-27 2019-11-29 北京机械设备研究所 A kind of MOSFET series circuit for high input voltage reverse exciting switching voltage regulator

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