CN207124566U - A kind of efficient flyback sourse - Google Patents

A kind of efficient flyback sourse Download PDF

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Publication number
CN207124566U
CN207124566U CN201720574652.5U CN201720574652U CN207124566U CN 207124566 U CN207124566 U CN 207124566U CN 201720574652 U CN201720574652 U CN 201720574652U CN 207124566 U CN207124566 U CN 207124566U
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diode
electric capacity
switch pipe
terminals
anode
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CN201720574652.5U
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Chinese (zh)
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林福祥
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Individual
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Abstract

It the utility model is related to a kind of efficient flyback sourse, utilize the electric energy on the induction electric energy and the primary leakage inductance of transformer in small sense, rechargeable electrical energy as freewheeling circuit, it is used as the discharge path that freewheeling circuit is provided using an extra switch pipe, main switch provides path for the primary of transformer, with main switch switch motion, the electric energy of primary is converted into secondary electric energy.Use two quick diodes to provide charging path for the induction electric energy of a small inductor and the leakage inductance electric energy of primary, while correct input current waveform.It is used to improve current waveform using a small capacitances while the moment for reducing main switch both ends turns off voltage.Power good of the present utility model, efficiently and cost is cheap.

Description

A kind of efficient flyback sourse
Technical field
Power technique fields are the utility model is related to, particularly a kind of efficient flyback sourse.
Background technology
Ortho-exciting electric source and flyback sourse are widely used in various electric equipments, and its advantage is that circuit is simple, the low of cost Its deficiency is efficiency bottom.These power supply is that a filter capacitor is directly connect after rectification silicon bridge, and this structure can produce greatly The non-linear current of amount simultaneously pollutes AC network, while the electric power utilization rate that it is transmitted to power network is relatively low.
In order to reduce non-linear current, and the ENG1000-3-2 that meets international standards, it has been proposed that various methods are come Power factor is improved, wherein there is passive power factor correcting circuit, its power factor is between 80%--90%；Also one kind is that have Active power factor correction circuit, such a line power factor is up to 99%.Most successful active circuitry is second order capability correction line Road, its principle is that the voltage of the rippled DC electricity after rectification first is brought up into specific voltage, and forms steady dc voltage Afterwards, then by this DC power conversion output direct current is turned into.
There is also some shortcomings for above-mentioned circuit：First, there is larger dash current when it starts working；2nd, it will be existing Voltage increase, so as to add the requirement to subsequent power conversion element（That is the requirement of switching tube）, High Power Factor at present The damage of power supply belongs to this reason more；3rd, the own loss of power supply is also increased due to adding single order circuit.
In addition people also propose many single-order high power factor direct current power supplies, and these circuit majorities are to sacrifice circuit reliability as generation Valency, it is worthless.In order to improve efficiency, there has been proposed LLC Switching Power Supply circuits, this circuit utilizes zero-current switching Principle, reduce switching loss, drastically increase efficiency (overall efficiency is up to 92%) of power supply still, this circuit also increases Manufacturing cost, while this loss for not reducing pfc circuit are added.
The content of the invention
In view of this, the purpose of this utility model is to provide a kind of efficient flyback sourse, the power good, efficiently and into This is cheap.
The utility model is realized using following scheme：Including rectifier bridge, transformer, inductance, the first diode, the two or two pole Pipe, the 3rd diode, the 4th diode, the 5th diode, first switch pipe, second switch pipe, the first electric capacity, the second electric capacity, 3rd electric capacity, the 4th electric capacity, secondary circuit unit and control circuit unit；The first switch pipe include the first terminals, Second terminals and control terminal, the second switch pipe include the first terminals, the second terminals and control terminal；
The input termination power frequency AC of the rectifier bridge, the positive output end of the rectifier bridge are connected to first electricity One end of appearance, the anode of the first diode；
The negative electrode of first diode is connected to one end of the inductance, the second terminals of second switch pipe, described The other end of inductance is connected to one end of the primary coil of the transformer；
The control terminal of the second switch pipe is connected to the control circuit unit, the first wiring of the second switch pipe End is connected to the anode of second electric capacity, the negative electrode of the 4th diode, the negative electrode of the 5th diode and described One end of 4th electric capacity；
The other end of the primary coil of the transformer is connected to the anode and first switch pipe of the 5th diode The first terminals；The control terminal of the first switch pipe is connected to the control circuit unit；
The negative terminal of second electric capacity is connected to the negative electrode of second diode and the anode of the 3rd diode；
The negative electrode of 3rd diode is connected to the anode of the 3rd electric capacity, the anode of the 4th diode；
The secondary coil of the transformer is connected with the secondary circuit unit；
The other end of first electric capacity, the other end of the 4th electric capacity, the first switch pipe the second terminals, The negative terminal of the anode of second diode and the 3rd electric capacity is connected to the negative output terminal of the rectifier bridge.
Further, the control logic for the control unit that the control circuit unit is carried out includes：Second switch pipe turns on First switch pipe turns on afterwards；First switch pipe disconnects after second switch pipe disconnects；First switch pipe is led simultaneously with second switch pipe It is logical；Second switch pipe simultaneously switches off with first switch pipe.
Further, the primary series of the inductance and transformer.
Further, the inductance value of the inductance is 0-0.05mH.
Further, the 5th diode and the second diode, the 3rd diode, the 4th diode, the second electric capacity and The freewheeling circuit series connection of 3rd electric capacity composition, this freewheeling circuit are attempted by the first switch pipe both ends.
Further, the 4th electric capacity is attempted by the 5th diode, the second diode, the 3rd diode, the 4th diode, The freewheeling circuit both ends of two electric capacity and the 3rd electric capacity composition.
Further, second switch pipe is connected between the negative electrode of the first diode and the anode of the second electric capacity.
Preferably, the inductance is connected with transformer, for correcting input current waveform；Second electric capacity, Three electric capacity, the second diode, the 3rd diode and the 4th diode form a freewheeling circuit and are used for when input voltage is less than second Circuit power supply when electric capacity, the 3rd electric capacity both end voltage；Second switch pipe is used for the electric energy for discharging the 4th electric capacity and freewheeling circuit； 4th electric capacity is used to correct input current waveform and limits the moment shut-off at the first switch pipe both ends when first switch pipe turns off Voltage, that is, reduce switch consumption；First diode and the 5th diode are the electric energy of inductance, the leakage inductance of transformer Electric energy and inputing power provide release electric energy passage；First diode is used to directly provide inputing power for transformer;Five or two Pole pipe is used for the moment shut-off voltage for limiting the first switch pipe both ends when first switch pipe turns off, that is, reduces switch consumption.
The utility model additionally provides a kind of another similar efficient power, including rectifier bridge, transformer, inductance, the One diode, the second diode, the 3rd diode, the 4th diode, first switch pipe, second switch pipe, the first electric capacity, second Electric capacity, the 3rd electric capacity, secondary circuit unit and control circuit unit；The first switch pipe includes the first terminals, second Terminals and control terminal, the second switch pipe include the first terminals, the second terminals and control terminal；
The input termination power frequency AC of the rectifier bridge, the positive output end of the rectifier bridge are connected to the inductance One end and the second terminals of the second switch pipe；The other end of the inductance is connected to the primary coil of the transformer One end；The control terminal of the second switch pipe is connected to the control circuit unit；
The other end of the primary coil of the transformer is connected to the anode of first diode, the first switch pipe The first terminals；The control terminal of the first switch pipe is connected to the control circuit unit；
The negative electrode of first diode is connected to the first wiring of the anode, the second switch pipe of first electric capacity End, one end of the 3rd electric capacity, the negative electrode of second diode；
The negative terminal of first electric capacity is connected to anode, the negative electrode of the 4th diode of the 3rd diode；
The negative electrode of 3rd diode is connected to the anode of second electric capacity, the 4th diode anode；
The secondary coil of the transformer is connected with the secondary circuit unit；
Second terminals of the first switch pipe, the other end of the 3rd electric capacity, the anode of second diode And the negative terminal of second electric capacity is connected to the negative output terminal of the rectifier bridge.
Further, the rectifier bridge is made up of fast reaction diode.
Compared with prior art, the utility model has following beneficial effect：Efficient power provided by the invention is small using one Inductance is connected with primary, using the electric energy on the induction electric energy and the primary leakage inductance of transformer in small sense, as afterflow The rechargeable electrical energy of circuit；The present invention is used as providing freewheeling circuit discharge path using an extra switch pipe, and main switch is transformation The primary of device provides path, and with main switch switch motion, the electric energy of primary is converted into secondary electric energy.The present invention uses two Quick diode provides charging path for the induction electric energy of a small inductor and the leakage inductance electric energy of primary, while corrects input Current waveform.The present invention is used to improve current waveform using a small capacitances while the moment for reducing main switch both ends turns off Voltage.
Brief description of the drawings
Fig. 1 is the inverse-excitation type efficient power circuit of the utility model embodiment one.
Fig. 2 is the inverse-excitation type efficient power circuit of the utility model embodiment two.
Embodiment
Below in conjunction with the accompanying drawings and embodiment is described further to the utility model.
Embodiment one.
As shown in figure 1, a kind of efficient power is present embodiments provided, including rectifier bridge BD10, transformer T10, inductance L10, the first diode D10, the second diode D12, the 3rd diode D14, the 4th diode D16, the 5th diode D18, One switching tube Q10, second switch pipe Q12, the first electric capacity C10, the second electric capacity C12, the 3rd electric capacity C14, the 4th electric capacity, secondary electrical Road unit and control circuit unit；The first switch pipe Q10 includes the first terminals, the second terminals and control terminal, The second switch pipe Q12 includes the first terminals, the second terminals and control terminal；
The input termination power frequency AC of the rectifier bridge BD10, the positive output end of the rectifier bridge BD10 are connected to institute State the first electric capacity C10 one end, the first diode D10 anode；
The negative electrode of the first diode D10 is connected to one end of the inductance L10, the second of second switch pipe Q12 connect Line end, the other end of the inductance L10 are connected to one end of the primary coil of the transformer T10；
The control terminal of the second switch pipe Q12 is connected to the control circuit unit, and the of the second switch pipe Q12 One terminals are connected to the anode of the second electric capacity C12, the 4th diode D16 negative electrode, the 5th diode D18 Negative electrode and the 4th electric capacity one end；
The other end of the primary coil of the transformer T10 is connected to the anode and first of the 5th diode D18 Switching tube Q10 the first terminals；The control terminal of the first switch pipe Q10 is connected to the control circuit unit；
The negative terminal of the second electric capacity C12 is connected to the negative electrode and the 3rd diode D14 of the second diode D12 Anode；
The negative electrode of the 3rd diode D14 is connected to the anode of the 3rd electric capacity C14, the 4th diode D16 Anode；
The secondary coil of the transformer T10 is connected with the secondary circuit unit；
The other end of the first electric capacity C10, the other end of the 4th electric capacity, the second of the first switch pipe Q10 The negative terminal of terminals, the anode of the second diode D12 and the 3rd electric capacity C14 is connected to the rectifier bridge BD10 Negative output terminal.
In the present embodiment, the control logic for the control unit that the control circuit unit is carried out includes：Second switch pipe First switch pipe Q10 is turned on after Q12 conductings；First switch pipe Q10 disconnects after second switch pipe Q12 disconnects；First switch pipe Q10 Simultaneously turned on second switch pipe Q12；Second switch pipe Q12 simultaneously switches off with first switch pipe Q10.
In the present embodiment, the primary series of the inductance L10 and transformer.The inductance value of the inductance is 0- 0.05mH。
In the present embodiment, the 5th diode D18 and the second diode D12, the 3rd diode D14, the four or two pole Pipe D16, the second electric capacity C12 and the 3rd electric capacity C14 compositions freewheeling circuit series connection, this freewheeling circuit are attempted by the first switch Pipe Q10 both ends.
In the present embodiment, the 4th electric capacity C16 is attempted by the 5th diode D18, the second diode D12, the 3rd diode The freewheeling circuit both ends that D14, the 4th diode D16, the second electric capacity C12 and the 3rd electric capacity C14 are formed.
In the present embodiment, second switch pipe Q12 be connected on the first diode negative electrode and the second electric capacity C12 anode it Between.
Preferably, the inductance is connected with transformer, for correcting input current waveform；Second electric capacity C12, 3rd electric capacity C14, the second diode D12, the 3rd diode D14 and the 4th diode D16 form a freewheeling circuit and are used for when defeated Circuit power supply when entering voltage less than the second electric capacity C12, the 3rd electric capacity C14 both end voltages；Second switch pipe Q12 is used to discharge the The electric energy of four electric capacity and freewheeling circuit；4th electric capacity C16 is used to correct input current waveform and limitation when first switch pipe turns off When first switch pipe both ends moment shut-off voltage, that is, reduce switch consumption；First diode D10 and the 5th diode D18 are The electric energy of inductance, the electric energy of the leakage inductance of transformer and inputing power provide release electric energy passage；First diode D10 For directly providing inputing power for transformer;5th diode D18 is used to limit the first switch when first switch pipe turns off The moment shut-off voltage at pipe both ends, that is, reduce switch consumption.
Preferably, in the present embodiment, the inductance L10 connects with transformer T10 primary coils, for correcting input electricity Flow waveform；Second electric capacity C12, the 3rd electric capacity C14, the second diode D12, the 3rd diode D14 and the 4th diode D16 compositions One freewheeling circuit is used for the circuit power supply when input voltage is less than the second electric capacity C12, the 3rd electric capacity C14 both end voltages；Second Switching tube Q12 is used for the electric energy for discharging the 4th electric capacity and freewheeling circuit；4th electric capacity is used to correct input current waveform and limitation When first switch pipe Q10 is turned off, the moment shut-off voltage at first switch pipe Q10 both ends, that is, reduce switch consumption；One or two pole Pipe D10 and the 5th diode D18 be inductance L10 electric energy, transformer T10 primary coils leakage inductance electric energy and inputing power carry For discharging electric energy passage；First diode D10 is used to directly provide inputing power for transformer T10;5th diode D18 is used for The moment shut-off voltage at the first switch pipe Q10 both ends when first switch pipe Q10 is turned off is limited, that is, reduces switch consumption.
Embodiment two.
As shown in Fig. 2 a kind of efficient power as another and embodiment one kind is present embodiments provided, including rectification Bridge, transformer T20, inductance L20, the first diode D20, the second diode D22, the 3rd diode D24, the 4th diode D26, First switch pipe Q20, second switch pipe Q22, the first electric capacity C20, the second electric capacity C22, the 3rd electric capacity C24, secondary circuit unit And control circuit unit；The first switch pipe Q20 includes the first terminals, the second terminals and control terminal, and described Two switching tube Q22 include the first terminals, the second terminals and control terminal；
The input termination power frequency AC of the rectifier bridge, the positive output end of the rectifier bridge are connected to the inductance L20 one end and the second terminals of the second switch pipe Q22；The other end of the inductance L20 is connected to the transformation One end of device T20 primary coil；The control terminal of the second switch pipe Q22 is connected to the control circuit unit；
The other end of the primary coil of the transformer T20 is connected to the anode of the first diode D20, described first Switching tube Q20 the first terminals；The control terminal of the first switch pipe Q20 is connected to the control circuit unit；
The negative electrode of the first diode D20 is connected to the anode of the first electric capacity C20, the second switch pipe D22 The first terminals, one end of the 3rd electric capacity C24, the negative electrode of the second diode D22；
The negative terminal of the first electric capacity C20 is connected to anode, the 4th diode D26 the moon of the 3rd diode D24 Pole；
The negative electrode of the 3rd diode D24 is connected to the anode of the second electric capacity C22, the 4th diode D26 Anode；
The secondary coil of the transformer T20 is connected with the secondary circuit unit；
The second terminals of the first switch pipe Q20, the other end, second diode of the 3rd electric capacity C24 D22 anode and the second electric capacity C22 negative terminal are connected to the negative output terminal of the rectifier bridge.
In the present embodiment, the rectifier bridge is made up of fast reaction diode.
It is noted that the utility model protection is hardware configuration, it is not claimed as control method.Above only For a preferable embodiment in the utility model embodiment.It is all but the utility model is not limited to the embodiment above Any equivalent change done by the utility model and modification, scope of the caused function without departing from this programme When, belong to the scope of protection of the utility model.

Claims (8)

  1. A kind of 1. efficient flyback sourse, it is characterised in that：Including rectifier bridge, transformer, inductance, the first diode, the two or two pole Pipe, the 3rd diode, the 4th diode, the 5th diode, first switch pipe, second switch pipe, the first electric capacity, the second electric capacity, 3rd electric capacity, the 4th electric capacity, secondary circuit unit and control circuit unit；The first switch pipe include the first terminals, Second terminals and control terminal, the second switch pipe include the first terminals, the second terminals and control terminal；
    The input termination power frequency AC of the rectifier bridge, the positive output end of the rectifier bridge are connected to first electric capacity One end, the anode of the first diode；
    The negative electrode of first diode is connected to one end of the inductance, the second terminals of second switch pipe, the inductance The other end be connected to the transformer primary coil one end；
    The control terminal of the second switch pipe is connected to the control circuit unit, and the first terminals of the second switch pipe connect It is connected to the anode of second electric capacity, the negative electrode of the 4th diode, the negative electrode and the described 4th of the 5th diode One end of electric capacity；
    The other end of the primary coil of the transformer be connected to the 5th diode anode and first switch pipe One terminals；The control terminal of the first switch pipe is connected to the control circuit unit；
    The negative terminal of second electric capacity is connected to the negative electrode of second diode and the anode of the 3rd diode；
    The negative electrode of 3rd diode is connected to the anode of the 3rd electric capacity, the anode of the 4th diode；
    The secondary coil of the transformer is connected with the secondary circuit unit；
    The other end of first electric capacity, the other end of the 4th electric capacity, the second terminals, described of the first switch pipe The negative terminal of the anode of second diode and the 3rd electric capacity is connected to the negative output terminal of the rectifier bridge.
  2. A kind of 2. efficient flyback sourse according to claim 1, it is characterised in that:The primary string of the inductance and transformer Connection.
  3. A kind of 3. efficient flyback sourse according to claim 2, it is characterised in that：The inductance value of the inductance is 0- 0.05mH。
  4. A kind of 4. efficient flyback sourse according to claim 1, it is characterised in that:5th diode and the two or two The freewheeling circuit series connection that pole pipe, the 3rd diode, the 4th diode, the second electric capacity and the 3rd electric capacity form, this series circuit is simultaneously It is connected on the first switch pipe both ends.
  5. A kind of 5. efficient flyback sourse according to claim 1, it is characterised in that:4th electric capacity is attempted by the five or two pole The freewheeling circuit both ends of pipe, the second diode, the 3rd diode, the 4th diode, the second electric capacity and the 3rd electric capacity composition.
  6. A kind of 6. efficient flyback sourse according to claim 1, it is characterised in that:Second switch pipe is connected on the first diode Negative electrode and the second electric capacity anode between.
  7. A kind of 7. efficient flyback sourse, it is characterised in that：Including rectifier bridge, transformer, inductance, the first diode, the two or two pole It is pipe, the 3rd diode, the 4th diode, first switch pipe, second switch pipe, the first electric capacity, the second electric capacity, the 3rd electric capacity, secondary Stage circuit units and control circuit unit；The first switch pipe includes the first terminals, the second terminals and control terminal, The second switch pipe includes the first terminals, the second terminals and control terminal；
    The input termination power frequency AC of the rectifier bridge, the positive output end of the rectifier bridge are connected to one end of the inductance And the second terminals of the second switch pipe；The other end of the inductance is connected to the one of the primary coil of the transformer End；The control terminal of the second switch pipe is connected to the control circuit unit；
    The other end of the primary coil of the transformer is connected to the anode of first diode, the of the first switch pipe One terminals；The control terminal of the first switch pipe is connected to the control circuit unit；
    The negative electrode of first diode be connected to the anode of first electric capacity, the second switch pipe the first terminals, One end of 3rd electric capacity, the negative electrode of second diode；
    The negative terminal of first electric capacity is connected to anode, the negative electrode of the 4th diode of the 3rd diode；
    The negative electrode of 3rd diode is connected to the anode of second electric capacity, the 4th diode anode；
    The secondary coil of the transformer is connected with the secondary circuit unit；
    Second terminals of the first switch pipe, the other end of the 3rd electric capacity, second diode anode and The negative terminal of second electric capacity is connected to the negative output terminal of the rectifier bridge.
  8. A kind of 8. efficient flyback sourse according to claim 7, it is characterised in that:The rectifier bridge is by fast reaction two Pole pipe forms.
CN201720574652.5U 2017-05-23 2017-05-23 A kind of efficient flyback sourse Expired - Fee Related CN207124566U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201720574652.5U CN207124566U (en) 2017-05-23 2017-05-23 A kind of efficient flyback sourse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201720574652.5U CN207124566U (en) 2017-05-23 2017-05-23 A kind of efficient flyback sourse

Publications (1)

Publication Number Publication Date
CN207124566U true CN207124566U (en) 2018-03-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201720574652.5U Expired - Fee Related CN207124566U (en) 2017-05-23 2017-05-23 A kind of efficient flyback sourse

Country Status (1)

Country Link
CN (1) CN207124566U (en)

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