CN101604919A - A kind of synchronous rectification Buck-Flyback converter - Google Patents
A kind of synchronous rectification Buck-Flyback converter Download PDFInfo
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- CN101604919A CN101604919A CNA2009101813338A CN200910181333A CN101604919A CN 101604919 A CN101604919 A CN 101604919A CN A2009101813338 A CNA2009101813338 A CN A2009101813338A CN 200910181333 A CN200910181333 A CN 200910181333A CN 101604919 A CN101604919 A CN 101604919A
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Abstract
The invention provides a kind of synchronous rectification Buck-Flyback converter, be applicable to the accessory power supply design of the former and deputy limit isolated working voltage that all kinds of control chips in the power supply are required, comprise synchronous rectification Buck converter, Flyback converter and Buck synchronous commutating control circuit; Wherein the output voltage of synchronous rectification Buck converter provides all kinds of control chips in former limit required operating voltage; The output voltage of Flyback converter provides all kinds of control chips of secondary required isolated working voltage; The synchronous rectification control signal that provides synchronous rectification Buck converter required is provided the Buck synchronous commutating control circuit.The present invention is different from existing topology can only provide former limit of single channel or secondary output voltage, the output voltage that it can provide former and deputy limit to isolate simultaneously, the output voltage amplitude of secondary can be set by former limit output voltage, circuit structure is simple, device meets with stresses lower, has under certain loading condition that voltage regulation result is good, the efficient advantages of higher.
Description
Technical field
The present invention relates to a kind of DC switch power supply converter, be specifically related to a kind of technical field of the DC/DC of being applicable to direct current digital power module accessory power supply.
Background technology
Along with the function of electronic equipment becomes increasingly complex, manage synchronously at load widely, lower output voltage and multiple power supply, the digital power module of DSP/FPGA control becomes popular research direction in recent years.Though digital power can provide more powerful monitoring function, the needed standby power of digital control chips such as DSP/FPGA also increases greatly.When standby, digital power not only needs to provide control chip required operating voltage in former limit to satisfy communication and monitoring function, comprises fault management, overcurrent protection and avoids shutdown etc., guarantees the system reliability that continues to guarantee remote diagnosis.Also need provide the control of secondary digit chip required operating voltage in addition, to provide as functions such as output voltage, sequencing control, current-sharings.The PCB space is very valuable in high power density power module design, and how designing not only simple in structure but also accessory power supply that efficient is high has become one of key issue that the design of digital module power supply faces.
Summary of the invention
Goal of the invention
The present invention is directed to that modern digital power supply control chip static working current is big, stand-by power consumption is high, be required to be all kinds of control chips of former secondary the characteristics of isolating output voltage are provided, a kind of synchronous rectification Buck-Flyback new converter has been proposed to provide digital power module controls chip required accessory power supply specially, with simplified design and raise the efficiency.
Technical scheme:
The present invention adopts following technical scheme for achieving the above object:
Synchronous rectification Buck-Flyback converter of the present invention, be used for providing for all kinds of control chips the operating voltage of former and deputy limit isolation at power supply, comprise synchronous rectification Buck converter, Flyback converter and Buck synchronous commutating control circuit, wherein the output voltage of synchronous rectification Buck converter is used to provide all kinds of control chips in former limit required operating voltage; The output voltage of Flyback converter is used to provide all kinds of control chips of secondary required isolated working voltage; The synchronous rectification control signal that provides synchronous rectification Buck converter required is provided the Buck synchronous commutating control circuit; Described synchronous rectification Buck-Flyback converter also comprises a transformer L1, transformer L1 has three windings and a shared magnetic core, it is former limit winding, the first secondary winding and the second secondary winding, the former limit of described transformer L1 winding is arranged in the synchronous rectification Buck converter, the transformer L1 first secondary winding is arranged in the Flyback converter, the transformer L1 second secondary winding is arranged in the Buck synchronous commutating control circuit, is added in the voltage on the winding of the former limit of transformer L1 in the synchronous rectification Buck converter and is coupled to transformer L1 first secondary winding in the Flyback converter and the transformer L1 second secondary winding in the Buck synchronous commutating control circuit respectively by transformer L1.
Synchronous rectification Buck converter in the synchronous rectification Buck-Flyback converter of the present invention is by switch control chip IC1, first capacitor C 1, first resistance R 1, second resistance R 2, second capacitor C 2, the 3rd capacitor C 3, the 3rd resistance R 3, the 4th resistance R 4, continued flow tube Q1, the 4th capacitor C 4 and the former limit of transformer L1 winding constitute, wherein an end of first capacitor C 1 respectively with positive source, the 8th pin of one end of first resistance R 1 and switch control chip IC1 connects, the other end of first capacitor C 1 respectively with the negative pole of power supply, the 4th pin of one end of second resistance R 2 and switch control chip IC1 connects, the other end of first resistance R 1 is connected with the 6th pin of switch control chip IC1, the other end of second resistance R 2 is connected with the 3rd pin of switch control chip IC1, one end of second capacitor C 2 is connected with the 7th pin of switch control chip IC1, the former border district of another termination; The 2nd pin of switch control chip IC1 is connected with an end of the 3rd capacitor C 3, the other end of the 3rd capacitor C 3 is connected with the 1st pin of switch control chip IC1,1 end and the continued flow tube Q1 drain electrode of the former limit of transformer L1 winding respectively, 2 ends of the former limit of transformer L1 winding are connected with an end of the 3rd resistance R 3, the positive pole of the 4th capacitor C 4 respectively, and the other end of the 3rd resistance R 3 is connected with the 5th pin of switch control chip IC1, an end of the 4th resistance R 4 respectively; The other end of the 4th resistance R 4 connects former border district respectively with after the source electrode of the negative pole of the 4th capacitor C 4, continued flow tube Q1 is connected, and the grid of continued flow tube Q1 is connected with the output of Buck synchronous commutating control circuit.
Flyback converter in the synchronous rectification Buck-Flyback converter of the present invention is by the 3rd diode D3, the 6th capacitor C 6, the transformer L1 first secondary winding composes in series successively, wherein the anode of the 3rd diode D3 is connected with 4 ends of the transformer L1 first secondary winding, the negative electrode of the 3rd diode D3 links to each other with the positive pole of the 6th capacitor C 6,3 ends of the transformer L1 first secondary winding with connect secondary ground after the negative pole of the 6th capacitor C 6 links to each other.
Buck synchronous commutating control circuit in the synchronous rectification Buck-Flyback converter of the present invention is by the first diode D1, the second diode D2, the 5th capacitor C 5, the 5th resistance R 5, PNP manages Q2, the transformer L1 second secondary winding is formed, wherein the negative electrode of the first diode D1 is the grid of Q1 with the output of synchronous Back control circuit respectively, the emitter of PNP pipe Q2 connects, the anode of the first diode D1 respectively with an end of the 5th capacitor C 5, the negative electrode of one end of the 5th resistance R 5 and the second diode D2 connects, the other end of the 5th resistance R 5 respectively with the other end of the 5th capacitor C 5, the base stage of PNP pipe Q2 connects, the anode of the second diode D2 is connected with 6 ends of the transformer L1 second secondary winding, and the collector electrode of 5 ends of the transformer L1 second secondary winding and PNP pipe Q2 is connected and connects former border district.
Synchronous rectification Buck-Flyback converter of the present invention, 1 end of the former limit of described transformer L1 winding, 3 ends of the first secondary winding, 5 ends of the second secondary winding are end of the same name.
Press such scheme, described synchronous rectification Buck-Flyback converter is made up of the synchronous rectification Buck converter on former limit, the Flyback converter and the Buck synchronous commutating control circuit of secondary.Transformer L1 can not only provide former secondary electrical isolation function, simultaneously also as the energy storage inductor of the outputting inductance of synchronous rectification Buck converter, Flyback converter with the function of synchronous rectification control signal is provided.Because former limit synchronous rectification Buck converter always works in the inductive current continuum of states, its duty ratio D is guaranteed, even synchronous rectification Buck converter or Flyback converter are operated in Light Condition, it is stable that the output voltage on its former and deputy limit also can keep.The output voltage of synchronous rectification Buck converter is set by its control circuit.The output voltage of secondary Flyback converter is controlled by the output voltage of former limit synchronous rectification Buck converter, and the big I of the output voltage values of its secondary is adjusted by the number of turns no-load voltage ratio between the transformer L1 former limit winding and the first secondary winding.
Press such scheme, when the main switch of synchronous rectification Buck converter was opened, the diode D3 of Flyback converter bore back-pressure, and transformer L1 does not transmit energy to secondary.When the continued flow switch pipe of synchronous rectification Buck converter was opened, the diode D3 forward conduction of Flyback converter, transformer L1 transmitted energy to secondary.
Beneficial effect
1, can provide the regulated output voltage of former limit and secondary isolation to satisfy the required operating voltage of all kinds of control chips of former secondary simultaneously.
2, because the accessory power supply power device of this invention is operated in switching mode and nonlinear model, operating efficiency is increased dramatically.No matter power module is operated in standby mode or normal mode of operation, all can directly use this accessory power supply power supply, need not to design extra accessory power supply and commutation circuit.
3, the secondary output voltage need not complicated control circuit setting, and its amplitude size is directly set by the coil no-load voltage ratio by former limit output voltage.
4, the accessory power supply device work is few, power device voltage stress is low, simplicity of design, has reduced cost and to the pcb board space requirement.
Description of drawings
Fig. 1 is the design of prior art tradition accessory power supply.
Fig. 2 is a schematic block circuit diagram of the present invention.
Fig. 3 is a circuit block diagram of the present invention.
Embodiment
Further specify embodiments of the invention below in conjunction with the explanation accompanying drawing:
As shown in Figure 1, the tradition accessory power supply is set the base voltage of triode by voltage-stabiliser tube D1, allow triode or MOSFET plumber do at linear zone to obtain the required supply power voltage of former limit control chip, provide the secondary control chip required isolated working voltage by forward converter simultaneously, as shown in Figure 1.Because the static working current of digital control chip adds the operating current that other all kinds of auxiliary control chips are required at tens milliamperes, the total quiescent current that flows through former limit triode is about about 0.1A.Power module is operated in wide input voltage range (as 36V～75V), when input voltage is that 75V and modular power source are when being operated in holding state, because triode is operated in its power consumption that is produced of linear condition up to several watts.In order to improve the operating efficiency of power module, when digital power module operate as normal, the accessory power supply when generally needing the extra auxiliary power circuit of design one cover to switch standby is to reduce power consumption in addition.Therefore be difficult to satisfy of the requirement of high power density digital power module to efficient and PCB space.
As Fig. 2, shown in Figure 3, synchronous rectification Buck-Flyback converter of the present invention, comprise synchronous rectification Buck converter, Flyback converter and Buck synchronous commutating control circuit, wherein synchronous rectification Buck converter is used to provide all kinds of control chips in former limit required operating voltage; The Flyback converter is used to provide all kinds of control chips of secondary required isolated working voltage; The synchronous rectification control signal that provides synchronous rectification Buck converter required is provided the Buck synchronous commutating control circuit; Input voltage enters the input of synchronous rectification Buck converter, produce the output voltage of 10V on former limit, the structure of described synchronous rectification Buck converter comprises first capacitor C 1, the inner MosFET of switch control chip IC1 (as the pipe of going up of Buck converter), be used for fixing ON time first resistance R 1 regularly, be used for second resistance R 2 that inner MosFET current limliting is provided with, second capacitor C 2 that is used for inner MosFET drive circuit power supply power supply, be used for the 3rd capacitor C 3 that inner MosFET driving voltage boosts, the 3rd resistance R 3 of output voltage sampling circuit and the 4th resistance R 4, continued flow tube Q1, be used for the 4th capacitor C 4 of output voltage filtering and the former limit winding of transformer L1 etc., the setting output voltage on former limit is 10V.
The driven in synchronism control signal circuit of continued flow tube Q1, promptly the Buck synchronous commutating control circuit is by the first diode D1, the second diode D2, the 5th capacitor C 5, the five resistance R 5, PNP manages Q2, and the transformer L1 second secondary winding is formed.
Structure the 3rd diode D3 of secondary Flyback converter, the 6th capacitor C 6, the transformer L1 first secondary winding composes in series successively, the voltage 8V that the output of the transformer L1 first secondary winding is stable.
The foregoing description adopts high-performance low price integrated chip to add the peripheral circuit composition, switch control chip IC1 is a kind of high frequency voltage descending control chip LM5009, its switch operating frequency maximum can reach 600Khz, the input voltage allowed band is 9.5V～95V, exportable maximum 150mA electric current, its operating ambient temperature is spent+125 degree for-40.This chip internal has comprised the operational amplifier of one 2% high accuracy 2.5V benchmark, has guaranteed the stability of output voltage.Circuit has adopted the regularly current hysteresis ring control technology of conducting, need not the compensation loop design.This chip internal is integrated simultaneously, and Buck goes up pipe MosFET, current-limiting function, idle function etc., has reduced the complexity of design cost and peripheral circuit, has reduced design difficulty.
The operation principle and the course of work:
Synchronous rectification Buck-Flyback converter is made up of synchronous rectification Buck converter, Flyback converter and Buck synchronous commutating control circuit.Transformer L1 not only provides the electrical isolation function among the figure, simultaneously the former limit of transformer L1 winding as the output inductor of synchronous rectification Buck converter, the transformer L1 first secondary winding as the energy storage inductor of Flyback converter, the self-driven signal of synchronous rectification that the transformer L1 second secondary winding provides the continued flow tube Q1 of synchronous rectification Buck converter.The former limit winding of transformer L1 and two shared magnetic cores of secondary winding, wherein 1,3,5 ends are end of the same name in three of transformer L1 windings.Because synchronous rectification Buck-Flyback always works under the inductive current continuum of states, D is relatively large for its duty ratio.Even this just guarantees that Buck or Flyback are operated in Light Condition, its output voltage V
O2Also can keep stable.The output voltage V of Flyback
O2Be subjected to the output voltage V of former limit Buck
O1Control, its V
O2Big I adjust by the former limit winding of transformer L1 and the coil no-load voltage ratio between the first secondary winding.
When continued flow tube Q1 turn-offs, be added in the voltage V on the former limit of the transformer L1 winding in the synchronous rectification Buck converter
L1 (1,2)Be V
In-V
O1, the voltage V that bears on the first secondary winding of transformer L1 in this moment Flyback converter
L1 (3,4)For just, therefore the 3rd diode D3 is ended, the inverse peak voltage that is born on the 3rd diode D3 is lower than traditional F lyback converter simultaneously, and the loaded work piece electric current of its secondary is provided by the 6th capacitor C 6.Because the second secondary winding produces positive voltage V
L1 (5,6), the 5th capacitor C 5 plays the effect of quickening PNP pipe Q2 conducting, therefore produces low level on continued flow tube Q1 grid and maintains off state.
When continued flow tube Q1 conducting, be added in the voltage V on the former limit of the transformer L1 winding in the synchronous rectification Buck converter
L1 (1,2)For-V
O1The voltage V that bears on the first secondary winding of transformer L1 in the while Flyback converter
L1 (3,4)For negative, its amplitude size is set by former limit output voltage, is specially former limit output voltage-V
O1Divided by the coil no-load voltage ratio between transformer L1 former limit winding and the transformer L1 first secondary winding.The 3rd diode D3 conducting this moment, the energy that is stored in the transformer L1 magnetic field discharges by the 3rd diode D3, gives the 6th capacitor C 6 chargings on the one hand, powers to the load on the other hand.When the secondary load was light, the electric current of Flyback converter was in when critical or interrupted, and the 3rd diode D3 is a zero-current switching, can obtain greater efficiency.The second secondary winding of transformer L1 produces negative voltage V
L1 (5,6), the 5th capacitor C 5 plays quickens the effect that PNP pipe Q2 closes, and the second secondary winding of transformer L1 produces negative voltage V through the first diode D1, the second diode D2 on the grid of continued flow tube Q1 simultaneously
L1 (5,6), make continued flow tube Q1 conducting.
The present invention adopts the integrated control chip of high-performance low price to greatly reduce the design difficulty of synchronous rectification Buck-Flyback converter, obtains control characteristic preferably with less peripheral circuit.Because this converter is operated on off state, the efficient of accessory power supply is guaranteed.Therefore need not to design the commutation circuit of main converter accessory power supply when different operating mode, saved the pcb board circuit space greatly, be specially adapted to the digital power module accessory power supply design of high power density.
Claims (5)
1, a kind of synchronous rectification Buck-Flyback converter, be used for providing for all kinds of control chips the operating voltage of former and deputy limit isolation at power supply, it is characterized in that: comprise synchronous rectification Buck converter, Flyback converter and Buck synchronous commutating control circuit, wherein the output voltage of synchronous rectification Buck converter is used to provide all kinds of control chips in former limit required operating voltage; The output voltage of Flyback converter is used to provide all kinds of control chips of secondary required isolated working voltage; The synchronous rectification control signal that provides synchronous rectification Buck converter required is provided the Buck synchronous commutating control circuit; Described synchronous rectification Buck-Flyback converter also comprises a transformer L1, transformer L1 has three windings and a shared magnetic core, it is former limit winding, the first secondary winding and the second secondary winding, the former limit of described transformer L1 winding is arranged in the synchronous rectification Buck converter, the transformer L1 first secondary winding is arranged in the Flyback converter, the transformer L1 second secondary winding is arranged in the Buck synchronous commutating control circuit, is added in the voltage on the winding of the former limit of transformer L1 in the synchronous rectification Buck converter and is coupled to transformer L1 first secondary winding in the Flyback converter and the transformer L1 second secondary winding in the Buck synchronous commutating control circuit respectively by transformer L1.
2, synchronous rectification Buck-Flyback converter according to claim 1, it is characterized in that: synchronous rectification Buck converter is by switch control chip IC1, first capacitor C 1, first resistance R 1, second resistance R 2, second capacitor C 2, the 3rd capacitor C 3, the 3rd resistance R 3, the 4th resistance R 4, continued flow tube Q1, the 4th capacitor C 4 and the former limit of transformer L1 winding constitute, wherein an end of first capacitor C 1 respectively with positive source, the 8th pin of one end of first resistance R 1 and switch control chip IC1 connects, the other end of first capacitor C 1 respectively with the negative pole of power supply, the 4th pin of one end of second resistance R 2 and switch control chip IC1 connects, the other end of first resistance R 1 is connected with the 6th pin of switch control chip IC1, the other end of second resistance R 2 is connected with the 3rd pin of switch control chip IC1, one end of second capacitor C 2 is connected with the 7th pin of switch control chip IC1, the former border district of another termination; The 2nd pin of switch control chip IC1 is connected with an end of the 3rd capacitor C 3, the other end of the 3rd capacitor C 3 is connected with the 1st pin of switch control chip IC1,1 end and the continued flow tube Q1 drain electrode of the former limit of transformer L1 winding respectively, 2 ends of the former limit of transformer L1 winding are connected with an end of the 3rd resistance R 3, the positive pole of the 4th capacitor C 4 respectively, and the other end of the 3rd resistance R 3 is connected with the 5th pin of switch control chip IC1, an end of the 4th resistance R 4 respectively; The other end of the 4th resistance R 4 connects former border district respectively with after the source electrode of the negative pole of the 4th capacitor C 4, continued flow tube Q1 is connected, and the grid of continued flow tube Q1 is connected with the output of Buck synchronous commutating control circuit.
3, synchronous rectification Buck-Flyback converter according to claim 1, it is characterized in that: the Flyback converter is by the 3rd diode D3, the 6th capacitor C 6, the transformer L1 first secondary winding composes in series successively, wherein the anode of the 3rd diode D3 is connected with 4 ends of the transformer L1 first secondary winding, the negative electrode of the 3rd diode D3 links to each other with the positive pole of the 6th capacitor C 6,3 ends of the transformer L1 first secondary winding with connect secondary ground after the negative pole of the 6th capacitor C 6 is connected.
4, synchronous rectification Buck-Flyback converter according to claim 1, it is characterized in that: the Buck synchronous commutating control circuit is by the first diode D1, the second diode D2, the 5th capacitor C 5, the 5th resistance R 5, PNP manages Q2, the transformer L1 second secondary winding is formed, wherein the negative electrode of the first diode D1 is the grid of Q1 with the output of synchronous Buck control circuit respectively, the emitter of PNP pipe Q2 connects, the anode of the first diode D1 respectively with an end of the 5th capacitor C 5, the negative electrode of one end of the 5th resistance R 5 and the second diode D2 connects, the other end of the 5th resistance R 5 respectively with the other end of the 5th capacitor C 5, the base stage of PNP pipe Q2 connects, the anode of the second diode D2 is connected with 6 ends of the transformer L1 second secondary winding, connects former border district after the collector electrode of 5 ends of the transformer L1 second secondary winding and PNP pipe Q2 is connected.
5, synchronous rectification Buck-Flyback converter according to claim 1 is characterized in that: 1 end of the former limit of described transformer L1 winding, 3 ends of the first secondary winding, 5 ends of the second secondary winding are end of the same name.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101813338A CN101604919A (en) | 2009-07-17 | 2009-07-17 | A kind of synchronous rectification Buck-Flyback converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101813338A CN101604919A (en) | 2009-07-17 | 2009-07-17 | A kind of synchronous rectification Buck-Flyback converter |
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|---|---|---|---|
| CNA2009101813338A Pending CN101604919A (en) | 2009-07-17 | 2009-07-17 | A kind of synchronous rectification Buck-Flyback converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106797183A (en) * | 2014-05-30 | 2017-05-31 | 技术消费产品股份有限公司 | Constant pressure and constant-flow driver circuit |
| CN108509687A (en) * | 2018-03-07 | 2018-09-07 | 南京邮电大学 | A kind of Flyback converters core loss computational methods |
| CN113659831A (en) * | 2021-08-06 | 2021-11-16 | 优利德科技(中国)股份有限公司 | Low-ripple linear control device and linear control method |
-
2009
- 2009-07-17 CN CNA2009101813338A patent/CN101604919A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106797183A (en) * | 2014-05-30 | 2017-05-31 | 技术消费产品股份有限公司 | Constant pressure and constant-flow driver circuit |
| CN108509687A (en) * | 2018-03-07 | 2018-09-07 | 南京邮电大学 | A kind of Flyback converters core loss computational methods |
| CN113659831A (en) * | 2021-08-06 | 2021-11-16 | 优利德科技(中国)股份有限公司 | Low-ripple linear control device and linear control method |
| CN113659831B (en) * | 2021-08-06 | 2023-03-31 | 优利德科技(中国)股份有限公司 | Low-ripple linear control device and linear control method |
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Open date: 20091216 |