CN106469983B - A kind of auxiliary power circuit - Google Patents
A kind of auxiliary power circuit Download PDFInfo
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- CN106469983B CN106469983B CN201510502194.XA CN201510502194A CN106469983B CN 106469983 B CN106469983 B CN 106469983B CN 201510502194 A CN201510502194 A CN 201510502194A CN 106469983 B CN106469983 B CN 106469983B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The present invention relates to a kind of auxiliary power circuits, comprising: power conversion modules, for receiving input voltage and converted to the input voltage, and secondary side output module, for the voltage after output transform；Wherein the power conversion modules are switched between flyback mode and LLC mode based on the input voltage.Implement auxiliary power circuit of the invention, the power conversion modules are based on the input voltage and switch between flyback mode and LLC mode, therefore the auxiliary power circuit can be worked in hard switching state in flyback mode to guarantee wide input range, it can also be worked under LLC mode in Sofe Switch state, to guarantee high conversion efficiency and power density.
Description
Technical field
The present invention relates to field of power supplies, more specifically to a kind of auxiliary power circuit.
Background technique
Accessory power supply is the very basic also unusual part and parcel of electronic circuit.Auxiliary power circuit generallys use flyback
Translation circuit.Inverse-excitation converting circuit has the advantages that as is evident below: circuit is simple, and input range is wide.But simultaneously, circuit of reversed excitation
Also have disadvantage as is evident below: conversion efficiency is very low, and general only 70% or so.It would therefore be highly desirable to which a kind of high conversion efficiency is auxiliary
Help power circuit.
In view of the above-mentioned problems, the solution that the prior art uses is, in circuit using high performance switching device and
High performance magnetic device, while switching frequency is reduced, to reduce the loss of conversion process.The advantages of program is auxiliary electricity
The conversion efficiency in source is improved to some extent, and can accomplish 75%-80% or so.But this method is also lacked there are two apparent
Point, first is that, high performance device is used, circuit cost has been increased considerably；Second is that because reducing switching frequency, and substantially
The volume of circuit is increased, thus power density is low.
At this stage, as electronic product power density is higher and higher, it is energy-saving and environment-friendly require it is higher and higher, to accessory power supply
Transfer efficiency and power density requirement it is higher and higher.Therefore urgently one kind can fundamentally improve transfer efficiency, power
Density, and can guarantee the auxiliary power circuit of wide input range.
Summary of the invention
The technical problem to be solved in the present invention is that auxiliary power circuit or transfer efficiency for the prior art it is low,
Defect at high cost and low power density, transfer efficiency, power density can fundamentally be improved and protect by providing one kind
Demonstrate,prove the auxiliary power circuit of wide input range.
The technical solution adopted by the present invention to solve the technical problems is: constructing a kind of auxiliary power circuit, comprising:
Power conversion modules, for receiving input voltage and converted to the input voltage, and
Secondary side output module, for the voltage after output transform；
Wherein the power conversion modules are switched between flyback mode and LLC mode based on the input voltage.
In auxiliary power circuit of the present invention, the power conversion modules include: first switch tube, second switch
Pipe, third switching tube, transformer, resonant inductance, resonant capacitance, the first switch tube grid connection LLC driving signal and
Flyback driving signal, the grid of the second switch connect the LLC driving signal, the grid connection of the third switching tube
The flyback driving signal, the drain electrode of the first switch tube connect the anode of the input voltage, the first switch tube
Source electrode connects the drain electrode of the second switch, and the source electrode of the first switch tube also connects the transformation through the resonant inductance
The first end of the primary side winding of device, the source electrode of the second switch connect the cathode of the input voltage, the third switch
The drain electrode of pipe connects the second end of the primary side winding of the transformer, and the source electrode of the third switching tube connects the input voltage
Cathode, the first end of the resonant capacitance connects the second end of the primary side winding of the transformer, the of the resonant capacitance
Two ends connect the cathode of the input voltage, the vice-side winding connection secondary side output module of the transformer.
In auxiliary power circuit of the present invention, the power conversion modules further comprise the 4th switching tube, institute
The grid for stating the 4th switching tube connects the flyback driving signal, source electrode connects the cathode of the input voltage, drain electrode connection institute
State the second end of resonant capacitance.
In auxiliary power circuit of the present invention, the power conversion modules further comprise absorbing current-limiting resistance,
The first end for absorbing current-limiting resistance connects the drain electrode of the third transistor, second end connect the primary side of the transformer around
The second end of group.
In auxiliary power circuit of the present invention, the resonant inductance is independent inductance or is integrated in the transformation
The integrated inductor of the primary side winding of device or the resonant inductance are the leakage inductance of the transformer.
In auxiliary power circuit of the present invention, the auxiliary power circuit further comprises connecting the power to become
Change the mold the primary side absorption module of block.
In auxiliary power circuit of the present invention, the primary side absorption module includes absorption resistance, absorption diode
And Absorption Capacitance, the cathode of the absorption diode connects the anode of the input voltage through the absorption resistance, anode connects
The second end of the primary side winding of the transformer, the first end of the Absorption Capacitance connect the anode of the input voltage, second
End connects the cathode of the absorption diode.
In auxiliary power circuit of the present invention, the transformer includes at least one vice-side winding, the pair side
Output module includes at least one the secondary side output unit for being connected at least one vice-side winding of the transformer.
In auxiliary power circuit of the present invention, the transformer includes the first vice-side winding, pair side output
Module includes the first secondary side output unit, and the described first secondary side output unit includes the first output capacitance, the second output capacitance, the
One outputting inductance, the first output resistance and the first output diode, the first end ground connection of the first vice-side winding of the transformer,
Second end connects the anode of first output diode, and the cathode of first output diode is through first output capacitance
Ground connection, the cathode of first output diode also connect the first electricity of the secondary side output module through first outputting inductance
Press the first end of output end and second output capacitance, the second end ground connection of second output capacitance, first output
One end of resistance is grounded, and the other end connects the first voltage output end of the secondary side output module.
In auxiliary power circuit of the present invention, the transformer further includes the second vice-side winding, and the pair side is defeated
Module further includes the second secondary side output unit out, and the described second secondary side output unit includes third output capacitance, the 4th output electricity
Appearance, the second outputting inductance, the second output resistance and the second output diode, the first end of the second vice-side winding of the transformer
Ground connection, second end connect the anode of second output diode, and the cathode of second output diode is defeated through the third
Capacity earth out, the cathode of second output diode also connect the secondary side output module through second outputting inductance
The first end of second voltage output end and the 4th output capacitance, the second end ground connection of the 4th output capacitance, described the
One end of two output resistances is grounded, and the other end connects the second voltage output end of the secondary side output module.
Implement auxiliary power circuit of the invention, the power conversion modules be based on the input voltage in flyback mode and
Switch between LLC mode, therefore the auxiliary power circuit can be worked in hard switching state in flyback mode to guarantee
Wide input range can also work in Sofe Switch state under LLC mode, to guarantee high conversion efficiency and power density.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the logic diagram of the first embodiment of auxiliary power circuit of the invention；
Fig. 2 is the circuit diagram of the second embodiment of auxiliary power circuit of the invention；
Fig. 3 is the working principle diagram of the first working condition of the flyback mode of embodiment illustrated in fig. 2；
Fig. 4 is the working principle diagram of the second working condition of the flyback mode of embodiment illustrated in fig. 2；
Fig. 5 is the working principle diagram of the first working condition of the LLC mode of embodiment illustrated in fig. 2；
Fig. 6 is the working principle diagram of the second working condition of the LLC mode of embodiment illustrated in fig. 2；
Fig. 7 is the circuit diagram of the 3rd embodiment of auxiliary power circuit of the invention；
Fig. 8 is the simulation waveform of embodiment illustrated in fig. 2；
Fig. 9 is the circuit diagram of the fourth embodiment of auxiliary power circuit of the invention；
Figure 10 is the circuit diagram of the 5th embodiment of auxiliary power circuit of the invention；
Figure 11 is the circuit diagram of the sixth embodiment of auxiliary power circuit of the invention；
Figure 12 is the circuit diagram of the 7th embodiment of auxiliary power circuit of the invention；
Figure 13 is the circuit diagram of the 8th embodiment of auxiliary power circuit of the invention.
Specific embodiment
As shown in Figure 1, including power conversion modules 100 and secondary side output module 200 in auxiliary power circuit of the invention.
The power conversion modules 100 are connect with input voltage, and are converted to the input voltage.Pair side output module 200
Transformed voltage is received from the power conversion modules 100 and is output it.In the present invention, the power conversion modules
100 are switched between flyback mode and LLC mode based on the input voltage.In the input voltage below or equal to setting
When being worth (such as 0-300V), the power conversion modules 100 are switched to flyback mode, and at this moment entire auxiliary power circuit can
Worked in flyback mode in hard switching state to guarantee wide input range.When the input voltage is higher than setting value (example
Such as 300-400V) when, the power conversion modules 100 are switched to LLC mode, and at this moment entire auxiliary power circuit can be in LLC
It is worked under mode in Sofe Switch state, to guarantee high conversion efficiency and power density.
In the present invention, the power conversion modules 100 and the secondary side output module 200 can appoint according in this field
What known module, circuit or chip building.Multiple power conversion module 100 and the secondary side output module is listed below
200 embodiment, it will be appreciated by those skilled in the art that, it without departing from the present invention, can also be to the present invention
Carry out various transformation and equivalent substitute.
Fig. 2 is the circuit diagram of the second embodiment of auxiliary power circuit of the invention.As shown in Fig. 2, accessory power supply
Circuit includes power conversion modules 100, secondary side output module 200 and primary side absorption module.The power conversion modules 100 and input
Voltage connection, and the input voltage is converted.Pair side output module 200 connects from the power conversion modules 100
It receives transformed voltage and outputs it.The primary side absorption module is connect with the power conversion modules 100 to absorb leakage inductance
Surge voltage.
As shown in Fig. 2, the power conversion modules 100 include: switching tube Q1, switching tube Q2, switching tube Q3, transformer
T1, current-limiting resistance Rs, resonant inductance Lr, resonant capacitance Cr are absorbed.The grid connection LLC driving signal of the switching tube Q1 and anti-
Swash driving signal ga.The grid of the switching tube Q2 connects the LLC driving signal gb, and the grid of the switching tube Q3 connects institute
State flyback driving signal gc.The drain electrode of the switching tube Q1 connects the positive Vin of the input voltage.The source of the switching tube Q1
Pole connects the drain electrode of the switching tube Q2.The source electrode of the switching tube Q1 is also through the resonant inductance Lr connection transformer T1
Primary side winding first end pp.The source electrode of the switching tube Q2 connects the cathode of the input voltage.The input voltage
Cathode ground connection.The second end that the drain electrode of the switching tube Q3 connects the primary side winding of the transformer T1 through absorbing current-limiting resistance Rs
pm.The source electrode of the switching tube Q3 connects the cathode of the input voltage.The first end of the resonant capacitance Cr connects the change
The second end of the second end pm, the resonant capacitance Cr of the primary side winding of depressor T1 connect the cathode of the input voltage.
The primary side absorption module includes absorption resistance R2, absorption diode D2 and Absorption Capacitance C3.Two poles of the absorption
The cathode of pipe D2 connects the anode of the input voltage through the absorption resistance R2, anode connects the primary side winding of the transformer
Second end pm, the first end of the Absorption Capacitance C3 connect the anode of the input voltage, second end connection it is described absorb two
The cathode of pole pipe D2.
In the present embodiment, the transformer T includes a vice-side winding, and the pair side output module includes being connected to institute
State the secondary side output unit of the vice-side winding of transformer T.Described first secondary side output unit includes output capacitance C1, output
Capacitor C2, outputting inductance L1, output resistance R1 and output diode D1.The first end sp of the vice-side winding of the transformer T1 connects
Ground, second end sm connect the anode of the output diode D1.The cathode of the output diode D1 is through the output capacitance C1
Ground connection.The cathode of the output diode D1 also connects the voltage output end of the secondary side output module through the outputting inductance L1
The first end of Vo and the output capacitance C2.The second end of the output capacitance C2 is grounded, a termination of the output resistance R1
Ground, the other end connect the voltage output end Vo of the secondary side output module.
In the present invention, the resonant inductance Lr can be independent inductance, as shown in Figure 2 above.The resonant inductance
Lr is also possible to be integrated in the integrated inductor of the primary side winding of the transformer or the resonant inductance can also be the transformation
The leakage inductance of device, as shown in Figure 7.
In the present invention, there is very strong absorption due to absorbing current-limiting resistance Rs and resonant capacitance Cr.Therefore at this
In the simplified embodiment of invention, above-mentioned primary side absorption module, i.e. absorption resistance R2, absorption diode D2 and absorption also can be omitted
Capacitor C3.In other embodiments of the present invention, there is certain loss under flyback mode due to absorbing current-limiting resistance Rs, it can be with
It omits or damages lesser element substitution using other.
Fig. 3-6 is the flyback mode of embodiment illustrated in fig. 2 and the working principle diagram of LLC mode.Fig. 8 is implemented shown in Fig. 2
The simulation waveform of example.Below with reference to Fig. 3-6 and 8, auxiliary power circuit of the invention is described as follows.
Auxiliary power circuit of the invention has 2 operation modes under flyback mode.In flyback mode, switching tube Q2 is always
It is closed state；Switching tube Q3 is copped wave state (alternately on/off).Switching tube Q1 is that copped wave state (open/close by alternating
It is disconnected), or it is always maintained at opening state.
Fig. 3 is the working principle diagram of the first working condition of the flyback mode of embodiment illustrated in fig. 2.As shown in figure 3, switch
Pipe Q1, switching tube Q3 are open-minded, and transformer T1 passes through switching tube Q1 → resonant inductance Lr → transformer T1 primary winding → absorption limit
Leakage resistance Rs → circuit switching tube Q3 carries out energy storage.Fig. 4 is the work of the second working condition of the flyback mode of embodiment illustrated in fig. 2
Make schematic diagram.As shown in figure 4, switching tube Q1 holding is opened, switching tube Q3 shutdown, transformer T1 primary winding passes through switching tube Q1
→ resonant inductance Lr → transformer T1 primary winding → absorption diode D2 → circuit Absorption Capacitance C3/ absorption resistance R2 is continued
Stream, transformer T1 secondary winding is by output diode D1 → outputting inductance L1 → output capacitance C1/ output capacitance C2 to load
Resistance R1 power supply.
Auxiliary power circuit of the invention has 2 operation modes under LLC mode.In LLC mode, switching tube Q3 locates always
In off state, switching tube Q1, switching tube Q2 are in copped wave state.It, can be with due to the resonance of resonant inductance Lr, resonant capacitance Cr
Realize the Sofe Switch of switching tube Q1, switching tube Q2, meanwhile, output diode D1 electric current is also to turn off after natural zero-crossing, reversed extensive
It is lost again small.The Sofe Switch of switching tube Q1, switching tube Q2, in addition zero Reverse recovery of output diode D1, so that entire auxiliary
The loss of power circuit is greatly reduced, to realize very high conversion efficiency (96% or so).
Fig. 5 is the working principle diagram of the first working condition of the LLC mode of embodiment illustrated in fig. 2.As shown in Fig. 2, switch
Pipe Q1 is opened, switching tube Q2 is turned off, and transformer T1 primary winding passes through switching tube Q1 → resonant inductance Lr → transformer T1 primary side
Winding → resonant capacitance Cr carries out resonance, and in resonant process, transformer T1 primary winding carries out energy storage.Fig. 6 is implemented shown in Fig. 2
The working principle diagram of second working condition of the LLC mode of example.As shown in fig. 6, switching tube Q1 is turned off, switching tube Q2 is open-minded, it is humorous
Shake access are as follows: resonant capacitance Cr → resonant inductance Lr → transformer T1 primary winding → resonant inductance Lr → switching tube Q2 carries out humorous
Vibration.In resonant process, the reversed zero passage of transformer T1 primary winding electric current, transformer T1 secondary winding by output diode D1 →
Outputting inductance L1 → output capacitance C1/ output capacitance C2 powers to load resistance R1.
Fig. 8 is the simulation waveform of embodiment illustrated in fig. 2.As shown in figure 8, En_llc waveform is making for control module sending
It can signal.Based on the enable signal, ga, gb and gc can control.Wherein, ga is LLC driving signal gb in LLC mode, anti-
Energizing mode is flyback driving signal gc.For En_llc waveform, when high level is that LLC mode is enabled, and low level is flyback mode
It is enabled.Vin waveform is the input voltage waveform of circuit, and input voltage becomes in a wide range from 100V or so -400V or so
Change.V5, V15 are 5V output voltage waveforms, 15V output voltage waveforms respectively.
By this group of waveform it can be seen that auxiliary power circuit is in flyback mode in the case where input voltage changes 4 times
Work with LLC mode adaptive, guarantees that output voltage is in highly stable level.In the present embodiment, work as input
When voltage is lower than 300V, auxiliary power circuit works in flyback mode.When input voltage is higher than 300V, auxiliary power circuit exists
The work of LLC mode.In actual application circuit, the case where input voltage is in low pressure section (0V-300V), is seldom, belongs to wink
State usually just will appear in booting and shutdown process, and during this, auxiliary power circuit works in flyback mode, obtains
Obtain very wide input voltage adaptation range.In actual application circuit, input voltage is in high pressure section (300V-400V)
There are many situation, belong to normality, and usually during product works normally, during this, auxiliary power circuit is worked in
LLC mode obtains optimal conversion efficiency (generally 96% or so).In this way, auxiliary power circuit two kinds of operating modes it
Between adaptively switch, respectively play its advantage, bring out the best in each other.It is designed by reasonable switching control, it is ensured that handoff procedure
It is very smooth, as shown in figure 8, the overshoot in V15 handoff procedure only has 0.3V or so when input voltage is just above 300V
(2%).
Therefore, implement auxiliary power circuit of the invention, the power conversion modules are based on the input voltage in flyback
Switch between mode and LLC mode, thus the auxiliary power circuit can work in flyback mode hard switching state from
And guarantee wide input range, it can also work under LLC mode in Sofe Switch state, to guarantee that high conversion efficiency and power are close
Degree.
Fig. 9 is the circuit diagram of the fourth embodiment of auxiliary power circuit of the invention.Embodiment illustrated in fig. 9 and Fig. 2
Shown in embodiment it is approximate, difference is, is connected with the concatenated absorption current-limiting resistance Rs of triode Q3 with resonant capacitance Cr
Switching tube Q4 replace.As shown in figure 9, the grid of the switching tube Q4 connects the flyback driving signal gd, source electrode connects institute
State the cathode of input voltage, the second end of the drain electrode connection resonant capacitance Cr.The working principle and figure of embodiment shown in Fig. 9
Embodiment shown in 2 is similar, is just not repeated herein.
In the present invention, as shown in figure 9, the resonant inductance Lr can be independent inductance.In other realities of the invention
It applies in example, the resonant inductance Lr is also possible to be integrated in the integrated inductor of the primary side winding of the transformer or the resonance
Inductance can also be the leakage inductance of the transformer, as shown in Figure 10.
Figure 11 is the circuit diagram of the sixth embodiment of auxiliary power circuit of the invention.Embodiment illustrated in fig. 11 and figure
Embodiment shown in 2 is approximate, and difference is, in the present embodiment, the transformer T1 includes the first vice-side winding and second
Vice-side winding.The secondary output unit when output module includes first secondary and the second secondary side output unit.As shown in figure 11, institute
Stating the first secondary side output unit includes output capacitance C100, output capacitance C101, outputting inductance L1, output resistance R1 and output two
Pole pipe D1.Described second secondary side output unit includes output capacitance C200, output capacitance C201, outputting inductance L2, output resistance
R2 and output diode D2.The first end p2 ground connection of the first vice-side winding of the transformer T1, second end m2 connection are described defeated
The anode of diode D1 out.The cathode of the output diode D1 is through output diode described in output capacitance C100 ground connection
The cathode of D1 also through the outputting inductance L1 connect the secondary side output module first voltage output end and the output capacitance
The first end of C101.The second end of the output capacitance C101 is grounded, one end ground connection of the output resistance R1, other end connection
The first voltage output end of pair side output module.The first end p3 ground connection of the second vice-side winding of the transformer T1, the
Two end p4 connect the anode of the output diode D2, and the cathode of the output diode D2 connects through the output capacitance C200
Ground, the second voltage that the cathode of the output diode D2 also connects the secondary side output module through the outputting inductance L2 export
The first end at end and the output capacitance C201, the second end ground connection of the output capacitance C201, the one of the output resistance R2
End ground connection, the other end connect the second voltage output end of the secondary side output module.
In the present embodiment, the first voltage output end is 5V voltage output end, and second voltage output end is 15V electricity
Press output end.In other embodiments of the invention, the first voltage output end and the second voltage output end can be defeated
Each same or different voltage out.In further embodiment of the invention, the transformer T1 may include multiple
Vice-side winding, and corresponding, the secondary output unit when output module may include multiple secondary.The output of the multiple pair side is single
Member can be the same or different.Any secondary side output unit being known in the art may be used to the present invention.
The working principle of embodiment shown in Figure 11 is similar with embodiment shown in Fig. 2, is just not repeated herein.At this
In invention, the resonant inductance Lr can be independent inductance.In other embodiments of the invention, the resonant inductance Lr
The integrated inductor or the resonant inductance that the primary side winding of the transformer can be integrated in can also be the transformer
Leakage inductance.
Figure 12 is the circuit diagram of the 7th embodiment of auxiliary power circuit of the invention.Embodiment illustrated in fig. 12 and figure
Embodiment shown in 11 is approximate, and difference is, is gone here and there with the concatenated absorption current-limiting resistance Rs of triode Q3 with resonant capacitance Cr
The switching tube Q4 of connection replaces.As shown in figure 12, the grid of the switching tube Q4 connects the flyback driving signal gd, source electrode connection
The cathode of the input voltage, drain electrode connect the second end of the resonant capacitance Cr.The working principle of embodiment shown in Figure 12
It is similar with embodiment shown in Figure 11, it is just not repeated herein.
In the present invention, as shown in figure 12, the resonant inductance Lr can be independent inductance.In other realities of the invention
It applies in example, the resonant inductance Lr is also possible to be integrated in the integrated inductor of the primary side winding of the transformer or the resonance
Inductance can also be the leakage inductance of the transformer, as shown in figure 13.
Although the present invention be illustrated by specific embodiment, it will be appreciated by those skilled in the art that, do not departing from
In the case where the scope of the invention, various transformation and equivalent substitute can also be carried out to the present invention.Therefore, the present invention is not limited to institute
Disclosed specific embodiment, and should include the whole embodiments fallen within the scope of the appended claims.
Claims (7)
1. a kind of auxiliary power circuit, comprising:
Power conversion modules, for receiving input voltage and converted to the input voltage, and
Secondary side output module, for the voltage after output transform；
Switch between flyback mode and LLC mode it is characterized in that, the power conversion modules are based on the input voltage；
The power conversion modules include: first switch tube, second switch, third switching tube, transformer, resonant inductance, humorous
Shake capacitor, the grid connection LLC driving signal and flyback driving signal of the first switch tube, the grid of the second switch
The LLC driving signal is connected, the grid of the third switching tube connects the flyback driving signal, the first switch tube
Drain electrode connects the anode of the input voltage, and the source electrode of the first switch tube connects the drain electrode of the second switch, described
The source electrode of first switch tube also connects the first end of the primary side winding of the transformer, the second switch through the resonant inductance
The source electrode of pipe connects the cathode of the input voltage, and the drain electrode of the third switching tube connects the primary side winding of the transformer
Second end, the source electrode of the third switching tube connect the cathode of the input voltage, and the first end of the resonant capacitance connects institute
The second end of the primary side winding of transformer is stated, the second end of the resonant capacitance connects the cathode of the input voltage, the change
The vice-side winding connection secondary side output module of depressor；
The transformer includes the first vice-side winding, the secondary output unit when output module includes first secondary, and described first
Secondary side output unit includes the first output capacitance, the second output capacitance, the first outputting inductance, the first output resistance and the first output
Diode, the first end ground connection of the first vice-side winding of the transformer, second end connect the sun of first output diode
The cathode of pole, first output diode is grounded through first output capacitance, and the cathode of first output diode is also
Through first outputting inductance connect the secondary side output module first voltage output end and second output capacitance the
One end, the second end ground connection of second output capacitance, one end ground connection of first output resistance, the other end connect the pair
The first voltage output end of side output module；
Wherein in flyback mode, the second switch is always closed state；The third switching tube is alternately to open/close
Disconnected state, the first switch tube are that alternately on/off is either always maintained at opening state；In LLC mode, described
Three switching tubes are constantly in off state, and the first switch tube and the second switch are alternating on/off states.
2. auxiliary power circuit according to claim 1, which is characterized in that the power conversion modules further comprise
Four switching tubes, the grid of the 4th switching tube connects the flyback driving signal, source electrode connect the input voltage cathode,
Drain electrode connects the second end of the resonant capacitance.
3. auxiliary power circuit according to claim 1, which is characterized in that the power conversion modules further comprise inhaling
Current-limiting resistance is received, the first end for absorbing current-limiting resistance connects the drain electrode of the third switching tube, second end connects the change
The second end of the primary side winding of depressor.
4. auxiliary power circuit described in any one of -3 claims according to claim 1, which is characterized in that the resonance
Inductance be independent inductance or be integrated in the primary side winding of the transformer integrated inductor or the resonant inductance be the change
The leakage inductance of depressor.
5. auxiliary power circuit according to claim 4, which is characterized in that the auxiliary power circuit further comprises connecting
Connect the primary side absorption module of the power conversion modules.
6. auxiliary power circuit according to claim 5, which is characterized in that the primary side absorption module includes absorbing electricity
Resistance, absorption diode and Absorption Capacitance, the cathode of the absorption diode connect the input voltage through the absorption resistance
Anode, anode connect the second end of the primary side winding of the transformer, and the first end of the Absorption Capacitance connects the input electricity
The anode of pressure, second end connect the cathode of the absorption diode.
7. auxiliary power circuit according to claim 1, which is characterized in that the transformer further include the second secondary side around
Group, the secondary output unit when output module further includes the second pair, the described second secondary side output unit include third output electricity
Appearance, the 4th output capacitance, the second outputting inductance, the second output resistance and the second output diode, the second of the transformer are secondary
The first end ground connection of side winding, second end connect the anode of second output diode, the yin of second output diode
Pole is grounded through the third output capacitance, and the cathode of second output diode is also through described in second outputting inductance connection
The first end of the second voltage output end of secondary side output module and the 4th output capacitance, the second of the 4th output capacitance
End ground connection, one end ground connection of second output resistance, the other end connect the second voltage output end of the secondary side output module.
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| CN108322053B (en) * | 2018-01-19 | 2020-10-09 | 深圳市盛弘电气股份有限公司 | Step-down conversion circuit |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6538906B1 (en) * | 2002-02-11 | 2003-03-25 | Delta Electronics, Inc. | Energy storage circuit for DC-DC converter |
| CN103580493A (en) * | 2012-07-27 | 2014-02-12 | 弗莱克斯电子有限责任公司 | Novel high power converter architecture |
| CN203942450U (en) * | 2014-07-11 | 2014-11-12 | 河南理工大学 | The soft switch circuit of anti exciting converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080278971A1 (en) * | 2007-05-12 | 2008-11-13 | Anatoliy Grigorievich Polikarpov | Forward-forward converter |
| TW201210184A (en) * | 2010-08-23 | 2012-03-01 | Skynet Electronic Co Ltd | Series resonant converter capable of reducing rated voltage and rated current of power switch |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6538906B1 (en) * | 2002-02-11 | 2003-03-25 | Delta Electronics, Inc. | Energy storage circuit for DC-DC converter |
| CN103580493A (en) * | 2012-07-27 | 2014-02-12 | 弗莱克斯电子有限责任公司 | Novel high power converter architecture |
| CN203942450U (en) * | 2014-07-11 | 2014-11-12 | 河南理工大学 | The soft switch circuit of anti exciting converter |
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