CN109728732A - A buck-boost power supply circuit and method based on two-stage cascaded voltage conversion - Google Patents
A buck-boost power supply circuit and method based on two-stage cascaded voltage conversion Download PDFInfo
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Abstract
The present invention relates to field of power supplies technical fields, disclose a kind of boost-buck power circuit and method based on the conversion of two-stage cascade voltage.The boost-buck power circuit that this method uses, it is the LLC+Buck-Boost two-stage cascade circuit being connected to form using source converter by filter and load converter, the half-bridge LLC circuit is open loop work, Buck-Boost circuit is Closed loop operation, and Buck decompression and Boost boosting are with double action.Present invention seek to address that the problems such as circuit efficiency is low in the case of wide-range input voltage, MOSFET constant power device more difficult type selecting.
Description
Technical field
The present invention relates to field of power supplies technical field more particularly to a kind of lifting piezoelectricity based on the conversion of two-stage cascade voltage
Source circuit and method.
Background technique
In recent years, the continuous upgrading, the continuous development of control technology of power electronic devices and the hair of various novel circuits topology
The bright cost for making converters is greatly reduced and applicable situation has also obtained depth expansion.The Buck of classics,
The bridge circuit of Boost and isolated form, flyback, forward converter etc. can satisfy the normal use under most of system.But
In some more special occasions, common single stage power converter is unable to satisfy performance indicator.For example some need high power
The occasion of factor power supply is usually all Boost PFC+Flyback circuits cascading composition.Nowadays, in more and more occasions, make
Meeting various requirement with single converters has seemed very difficult, therefore the research to tandem type converter
It is particularly important.
Summary of the invention
In order to overcome the deficiencies of the prior art, the present invention provides a kind of boost-buck power electricity based on the conversion of two-stage cascade voltage
Road and method.
In order to achieve the above-mentioned object of the invention, present invention employs following technical solutions:
A kind of boost-buck power circuit based on the conversion of two-stage cascade voltage, including DC input voitage VIN, input voltage
Signal ground GND exports DC voltage VOUT, output voltage signal ground SGND, resistor R1, R2, capacitor C1~C6, inductor
L1, L2, metal-oxide-semiconductor Q1~Q8, single-chip microcontroller U1, MOS driver U2~U8, transformer T1~T4；
One end of DC input voitage VIN termination resistor R1, capacitor C1, C3 and metal-oxide-semiconductor Q1；Another termination of resistor R1
Resistor R2, capacitor C1, C2, transformer T1 primary one end；The one of another termination inductor L1 and metal-oxide-semiconductor Q2 of metal-oxide-semiconductor Q1
End；Another termination transformer T1 primary other end of inductor L1；Resistor R2, capacitor C2, C3 and another termination of metal-oxide-semiconductor Q2 are defeated
GND with entering voltage signal；
T1 grade of transformer one terminates the one end metal-oxide-semiconductor Q3；Another one end termination metal-oxide-semiconductor Q4 of T1 grade of transformer；Transformer
T1 secondary centre tap one terminates metal-oxide-semiconductor Q5, the one end capacitor C4, C5；Metal-oxide-semiconductor Q5 another termination inductor L2 and metal-oxide-semiconductor Q6
One end；One end of another termination metal-oxide-semiconductor Q7, Q8 of inductor L2；Another terminating capacitor C6 of metal-oxide-semiconductor Q7；Metal-oxide-semiconductor Q3, Q4,
Another termination output voltage signal of Q6, Q8, capacitor C4, C5, C6 ground SGND.
A kind of boost-buck power method based on the conversion of two-stage cascade voltage, using LLC+Buck-Boost two-stage cascade,
Half-bridge LLC circuit is open loop work, and Buck-Boost circuit is Closed loop operation, and its step are as follows:
1) LLC half bridge resonant, is made, by switching tube Q1, Q2 half-bridge bridge arm formed and mean value capacitor C1, C2 phase
Switching circuit is even constituted, resonant capacitance Cr connects and composes resonant tank, transformer by resonant inductance Lr and magnetizing inductance Lm
Grade is connected by rectifier diode D3, D4 with filter capacitor Co.
What LLC resonant converter was taken be frequency modulation control mode, i.e. the conducting dutycycle of switching tube Q1 and Q2 may each be about
50%, it works alternatively；Setting is added in conducting while to prevent switching tube Q1 and Q2 between the driving signal of two switching tubes
Dead time；
2) One Buck-Boost converter body circuit topological structure, polarity counter-rotative type converter circuit Buck-Boost tool, are made
There is the double action of Buck decompression and Boost boosting；By switching tube VT1One end and energy storage inductor L1, rectifier diode VD1One
End connection, rectifier diode VD1The other end be connected with one end of filter capacitor, load；Switching tube VT1Control terminal and PWM are controlled
Driving circuit is connected；Energy storage inductor L1The other end be connected with the other end of filter capacitor, load；
3), the working method of the two-stage cascade of half-bridge resonance circuit LLC converter circuit+Buck-Boost:
The work of prime LLC half-bridge resonance topology, in switching tube Q1 conducting, electric current passes through Q1, resonant inductance L1, transformer
T1, resonant capacitance C1, C2, charge to resonant inductance L1 and resonant capacitance C1, C2, at this time switching tube Q4 be connected, pass through by
The energy of transformer T1 primary is charged by switching tube Q4 to C4, C5.
If transformer output voltage is higher than output DC voltage VOUT, circuit works in BUCK mode, and Q7 is at this time
Normally off, Q8 are in normally open, when switching tube Q5 conducting continued flow tube Q6 is disconnected, electric current by switching tube Q5, inductance L2 and
Switching tube Q7 forming circuit provides energy to charging while induction charging energy storage to capacitor C6；When switching tube Q5 turns off afterflow
When pipe Q6 is connected, electric current passes through continued flow tube Q6, inductance L2, switching tube Q7, capacitor C6 forming circuit, inductance L2, capacitor C6 release
Its energy stored.
If transformer output voltage works in BOOST mode lower than output DC voltage VOUT, circuit, Q5 is at this time
Normally off, Q6 are in normally open, when switching tube Q8 conducting continued flow tube Q7 is disconnected, electric current by switching tube Q5, inductance L2 and
Switching tube Q7 body diode forming circuit provides energy to charging while induction charging energy storage to capacitor C6；As switching tube Q8
When turning off continued flow tube Q7 conducting, for electric current by inductance L2, continued flow tube Q7, capacitor C6 forming circuit, inductance L2, capacitor C6 discharge it
The energy of storage.
Turned off in lower half period Q1, resonant inductance L1 electric current cannot be mutated, by transformer T1 resonant capacitance C2 with open
The body diode for closing pipe Q2 constitutes circuit and discharges, and until resonant inductance L1 electric current is 0, half-bridge switch pipe Q2 is connected, due to
The body diode of switching tube Q2 is on state, so switching tube Q2 is no-voltage unlatching；It is stored in resonant capacitance C1, C2
Energy constitute circuit by transformer T1, resonant inductance L1, switching tube Q2, switching tube Q3 is open-minded at this time, by by transformer
The energy of T1 primary charges through switching tube Q3 to C4, C5；Buck-Boost circuit working method is the same with first half cycle, until
This, LLC half-bridge resonance circuit+Buck-Boost circuit completes a complete switch periods, each switch afterwards
The movement of last switch periods will be repeated in period.
Wherein LLC half-bridge resonance circuit uses full-wave rectification, and output ripple is 2 times of half-bridge switch frequency, then Buck-
The switching frequency of Boost circuit is two times of LLC half-bridge resonance circuit switch frequency, so that controller is opened in LLC half-bridge resonance
The duty ratio of pass pipe Q1, Q2 are all the fixed duty cycle less than 50%.
Due to the adoption of the above technical scheme, the present invention has the following beneficial effects:
A kind of boost-buck power and method based on the conversion of two-stage cascade voltage, it is intended to solve wide-range input voltage situation
The problems such as lower circuit efficiency is low, MOSFET constant power device more difficult type selecting.The front stage converter of two-stage cascade transformer configuration is logical
It is commonly referred to as source converter, rear class converter is commonly known as load converter.System after cascade can make up single transformation
The deficiency of device, and then improve the performance of system.
Detailed description of the invention
Fig. 1 is the circuit block diagram of two-stage cascade transformer configuration.
Fig. 2 is the circuit work block diagram of two-stage cascade transformer configuration.
Fig. 3 is LLC half bridge resonant topological structure circuit diagram.
Fig. 4 is the circuit diagram of One Buck-Boost converter body topological structure.
Fig. 5 is the boost-buck power circuit diagram of two-stage cascade voltage conversion.
Fig. 6 is the two-stage cascade transformer configuration circuit block diagram of single-chip microcontroller connection.
Specific embodiment
This patent is further explained with reference to the accompanying drawing.But the protection scope of this patent is not limited to specifically implement
Mode.
As shown in Fig. 1,2,3,4,5,6, a kind of boost-buck power circuit based on the conversion of two-stage cascade voltage, including direct current
Input voltage VIN, input voltage signal ground GND export DC voltage VOUT, output voltage signal ground SGND, resistor R1,
R2, capacitor C1~C6, inductor L1, L2, metal-oxide-semiconductor Q1~Q8, single-chip microcontroller U1, MOS driver U2~U8, transformer T1~
T4.The wherein model dsPIC33FJ16GS502 that single-chip microcontroller U1 is used.
One end of DC input voitage VIN termination resistor R1, capacitor C1, C3 and metal-oxide-semiconductor Q1；Another termination of resistor R1
Resistor R2, capacitor C1, C2, transformer T1 primary one end；The one of another termination inductor L1 and metal-oxide-semiconductor Q2 of metal-oxide-semiconductor Q1
End；Another termination transformer T1 primary other end of inductor L1；Resistor R2, capacitor C2, C3 and another termination of metal-oxide-semiconductor Q2 are defeated
GND with entering voltage signal；
T1 grade of transformer one terminates the one end metal-oxide-semiconductor Q3；Another one end termination metal-oxide-semiconductor Q4 of T1 grade of transformer；Transformer
T1 secondary centre tap one terminates metal-oxide-semiconductor Q5, the one end capacitor C4, C5；Metal-oxide-semiconductor Q5 another termination inductor L2 and metal-oxide-semiconductor Q6
One end；One end of another termination metal-oxide-semiconductor Q7, Q8 of inductor L2；Another terminating capacitor C6 of metal-oxide-semiconductor Q7；Metal-oxide-semiconductor Q3, Q4,
Another termination output voltage signal of Q6, Q8, capacitor C4, C5, C6 ground SGND.
This patent aims to solve the problem that in the case of wide-range input voltage that circuit efficiency is low, the more difficult type selecting of MOSFET constant power device
The problems such as.Two-stage cascade transformer configuration is as shown in Figure 1.Front stage converter is commonly known as source converter, and rear class converter is logical
It is commonly referred to as load converter.System after cascade can make up the deficiency of single converter, and then improve the performance of system.
Used LLC+Buck-Boost two-stage cascade, is half-bridge LLC circuit open loop work, and Buck-Boost circuit closes
Ring work, it can be achieved that up to 95% efficiency.Circuit work is as shown in Figure 2.
LLC half bridge resonant structure is as shown in Figure 3.The main devices of composition LLC half bridge resonant have: two
Switching tube Q1, Q2 and body diode D1, D2 parasitic capacitance C1, C2, resonant capacitance Cr, Lr, magnetizing inductance Lm, secondary side use center
The transformer of tap structure, secondary commutation diode (practical is devices), the devices such as filter capacitor Co.
Different from the control mode of traditional pwm converter, what LLC resonant converter was taken be frequency modulation control mode, i.e.,
The conducting dutycycle of switching tube Q1 and Q2 may each be about 50%, work alternatively.But to prevent them from simultaneously turning on, in two switching tubes
Driving signal between certain dead time is added.
One Buck-Boost converter body circuit topology is as shown in Figure 4.Polarity counter-rotative type (Buck-Boost) converter circuit by
Switching tube VT1, energy storage inductor L1, whole (Continued) stream diode VD1And filter capacitor c1Equal components composition.Buck-Boost circuit
Double action with Buck decompression and Boost boosting.
The work of prime LLC half-bridge resonance topology, in switching tube Q1 conducting, electric current passes through Q1, resonant inductance L1, transformer
T1, resonant capacitance C1, C2, charge to resonant inductance L1 and resonant capacitance C1, C2, at this time switching tube Q4 be connected, pass through by
The energy of transformer T1 primary is charged by switching tube Q4 to C4, C5.
If transformer output voltage is higher than output DC voltage VOUT, circuit works in BUCK mode, and Q7 is at this time
Normally off, Q8 are in normally open, when switching tube Q5 conducting continued flow tube Q6 is disconnected, electric current by switching tube Q5, inductance L2 and
Switching tube Q7 forming circuit provides energy to charging while induction charging energy storage to capacitor C6；When switching tube Q5 turns off afterflow
When pipe Q6 is connected, electric current passes through continued flow tube Q6, inductance L2, switching tube Q7, capacitor C6 forming circuit, inductance L2, capacitor C6 release
Its energy stored.
If transformer output voltage works in BOOST mode lower than output DC voltage VOUT, circuit, Q5 is at this time
Normally off, Q6 are in normally open, when switching tube Q8 conducting continued flow tube Q7 is disconnected, electric current by switching tube Q5, inductance L2 and
Switching tube Q7 body diode forming circuit provides energy to charging while induction charging energy storage to capacitor C6；As switching tube Q8
When turning off continued flow tube Q7 conducting, for electric current by inductance L2, continued flow tube Q7, capacitor C6 forming circuit, inductance L2, capacitor C6 discharge it
The energy of storage.
Turned off in lower half period Q1, resonant inductance L1 electric current cannot be mutated, by transformer T1 resonant capacitance C2 with open
The body diode for closing pipe Q2 constitutes circuit and discharges, and until resonant inductance L1 electric current is 0, half-bridge switch pipe Q2 is connected, due to
The body diode of switching tube Q2 is on state, so switching tube Q2 is no-voltage unlatching；It is stored in resonant capacitance C1, C2
Energy constitute circuit by transformer T1, resonant inductance L1, switching tube Q2, switching tube Q3 is open-minded at this time, by by transformer
The energy of T1 primary charges through switching tube Q3 to C4, C5；Buck-Boost circuit working method is the same with first half cycle, until
This, LLC half-bridge resonance circuit+Buck-Boost circuit completes a complete switch periods, each switch afterwards
The movement of last switch periods will be repeated in period.
Wherein LLC half-bridge resonance circuit uses full-wave rectification, so its output ripple is 2 times of half-bridge switch frequency.
And the switching frequency of Buck-Boost circuit is designed as two times of LLC half-bridge resonance circuit switch frequency, so that controller is set
Meter becomes simple, is designed to be slightly less than 50% fixed duty cycle in the duty ratio of LLC half-bridge resonance switching tube Q1, Q2, greatly
Its efficiency is improved greatly.
Claims (3)
1. a kind of boost-buck power circuit based on the conversion of two-stage cascade voltage, it is characterized in that: include DC input voitage VIN,
Input voltage signal ground GND, exports DC voltage VOUT, output voltage signal ground SGND, resistor R1, R2, and capacitor C1~
C6, inductor L1, L2, metal-oxide-semiconductor Q1~Q8, single-chip microcontroller U1, MOS driver U2~U8, transformer T1~T4；
One end of DC input voitage VIN termination resistor R1, capacitor C1, C3 and metal-oxide-semiconductor Q1；Another terminating resistor of resistor R1
Device R2, capacitor C1, C2, transformer T1 primary one end；One end of another the termination inductor L1 and metal-oxide-semiconductor Q2 of metal-oxide-semiconductor Q1；Electricity
Another termination transformer T1 primary other end of sensor L1；Resistor R2, capacitor C2, C3 and another termination input electricity of metal-oxide-semiconductor Q2
Press signal ground GND；
T1 grade of transformer one terminates the one end metal-oxide-semiconductor Q3；Another one end termination metal-oxide-semiconductor Q4 of T1 grade of transformer；Transformer T1 times
Grade centre cap one terminates metal-oxide-semiconductor Q5, the one end capacitor C4, C5；The one of another termination inductor L2 and metal-oxide-semiconductor Q6 of metal-oxide-semiconductor Q5
End；One end of another termination metal-oxide-semiconductor Q7, Q8 of inductor L2；Another terminating capacitor C6 of metal-oxide-semiconductor Q7；Metal-oxide-semiconductor Q3, Q4, Q6,
Another termination output voltage signal of Q8, capacitor C4, C5, C6 ground SGND.
2. a kind of boost-buck power circuit based on the conversion of two-stage cascade voltage according to claim 1, it is characterized in that: LLC
Circuit is opened loop control, and BUCK-BOOST circuit is closed-loop control.
3. a kind of boost-buck power method based on the conversion of two-stage cascade voltage, it is characterized in that: using LLC+Buck-Boost two
Grade cascade, half-bridge LLC circuit are open loop work, and Buck-Boost circuit is Closed loop operation, and its step are as follows:
1) LLC half bridge resonant, is made, passes through concatenated diode D1, D2 and string by two concatenated switching tube Q1, Q2
Parasitic capacitance C1, C2 of connection, which is connected, constitutes switching circuit, and resonant capacitance Cr connect structure with magnetizing inductance Lm by resonant inductance Lr
At resonant tank, it is connected by synchronous rectification diode with filter capacitor Co using the secondary of centre cap structure transformer；
What LLC resonant converter was taken be frequency modulation control mode, i.e. the conducting dutycycle of switching tube Q1 and Q2 may each be about 50%,
It works alternatively；Conducting while to prevent switching tube Q1 and Q2, is added the dead of setting between the driving signal of two switching tubes
Area's time；
2) One Buck-Boost converter body circuit topological structure, is made, polarity counter-rotative type converter circuit Buck-Boost has
The double action of Buck decompression and Boost boosting；By switching tube VT1One end and energy storage inductor L1, rectifier diode VD1One end
Connection, rectifier diode VD1The other end be connected with one end of filter capacitor, load；Switching tube VT1Control terminal and PWM control are driven
Dynamic circuit is connected；Energy storage inductor L1The other end be connected with the other end of filter capacitor, load；
3), the working method of the two-stage cascade of half-bridge resonance circuit LLC+ converter circuit Buck-Boost:
Prime LLC half-bridge resonance topology work, switching tube Q1 conducting when, electric current by Q1, resonant inductance L1, transformer T1,
Resonant capacitance C1, C2 charge to resonant inductance L1 and resonant capacitance C1, C2, and switching tube Q4 is connected at this time, by by transformation
The energy of device T1 primary is charged by switching tube Q4 to C4, C5；
If transformer output voltage is higher than output DC voltage VOUT, circuit works in BUCK mode, and Q7 is in normally closed at this time
State, Q8 are in normally open, and when switching tube Q5 conducting continued flow tube Q6 is disconnected, electric current passes through switching tube Q5, inductance L2 and switch
Pipe Q7 forming circuit provides energy to charging while induction charging energy storage to capacitor C6；When switching tube Q5 turns off continued flow tube Q6
When conducting, for electric current by continued flow tube Q6, inductance L2, switching tube Q7, capacitor C6 forming circuit, inductance L2, capacitor C6 discharge its storage
The energy deposited；
If transformer output voltage works in BOOST mode lower than output DC voltage VOUT, circuit, Q5 is in normally closed at this time
State, Q6 are in normally open, and when switching tube Q8 conducting continued flow tube Q7 is disconnected, electric current passes through switching tube Q5, inductance L2 and switch
Pipe Q7 body diode forming circuit provides energy to charging while induction charging energy storage to capacitor C6；When switching tube Q8 is turned off
When continued flow tube Q7 is connected, for electric current by inductance L2, continued flow tube Q7, capacitor C6 forming circuit, inductance L2, capacitor C6 discharge its storage
Energy；
It is turned off in lower half period Q1, resonant inductance L1 electric current cannot be mutated, by transformer T1 resonant capacitance C2 and switching tube
The body diode of Q2 constitutes circuit and discharges, and until resonant inductance L1 electric current is 0, half-bridge switch pipe Q2 is connected, due to switch
The body diode of pipe Q2 is on state, so switching tube Q2 is no-voltage unlatching；The energy stored in resonant capacitance C1, C2
Amount constitutes circuit by transformer T1, resonant inductance L1, switching tube Q2, and switching tube Q3 is open-minded at this time, by will be at the beginning of transformer T1
The energy of grade charges through switching tube Q3 to C4, C5；Buck-Boost circuit working method is the same with first half cycle, so far,
LLC half-bridge resonance circuit+Buck-Boost circuit completes a complete switch periods, each switch periods afterwards
The interior movement that will repeat last switch periods；
LLC half-bridge resonance circuit uses full-wave rectification, and output ripple is 2 times of half-bridge switch frequency, Buck-Boost circuit
Switching frequency be two times of switching frequency of LLC half-bridge resonance circuit, controller can be made in LLC half-bridge resonance switching tube
The duty ratio of Q1, Q2 are both less than 50% fixed duty cycle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910137380.6A CN109728732A (en) | 2019-02-25 | 2019-02-25 | A buck-boost power supply circuit and method based on two-stage cascaded voltage conversion |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910137380.6A CN109728732A (en) | 2019-02-25 | 2019-02-25 | A buck-boost power supply circuit and method based on two-stage cascaded voltage conversion |
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Cited By (2)
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| WO2021179930A1 (en) * | 2020-03-12 | 2021-09-16 | Oppo广东移动通信有限公司 | Power supply conversion circuit and power supply conversion method |
| CN115327218A (en) * | 2022-10-13 | 2022-11-11 | 北京京仪北方仪器仪表有限公司 | Non-invasive power factor measuring device and split type electric power measuring system |
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| US20120112657A1 (en) * | 2009-07-03 | 2012-05-10 | Koninklijke Philips Electronics N.V. | Low cost power supply circuit and method |
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| WO2021179930A1 (en) * | 2020-03-12 | 2021-09-16 | Oppo广东移动通信有限公司 | Power supply conversion circuit and power supply conversion method |
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