CN209593289U - Buck-Boost circuit - Google Patents
Buck-Boost circuit Download PDFInfo
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- CN209593289U CN209593289U CN201920129622.2U CN201920129622U CN209593289U CN 209593289 U CN209593289 U CN 209593289U CN 201920129622 U CN201920129622 U CN 201920129622U CN 209593289 U CN209593289 U CN 209593289U
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Abstract
The utility model discloses a kind of Buck-Boost circuits, including power supply chip, metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3, inductance L, capacitor C, one R1 of resistance, two R2 of resistance, three R3 of resistance；The power supply chip has the first PWM output end, the 2nd PWM output end and output feedback end.The Buck-Boost circuit of the utility model, output voltage is constant all the time constant when input voltage changes, and according to the variation of input voltage, there are three types of operating modes for circuit tool: Buck mode, Boost mode and Buck-Boost mode；Structure is simple, stable and reliable for performance, at low cost, can put into volume production.
Description
Technical field
The utility model relates to power electronics fields, and in particular to a kind of Buck-Boost circuit.
Background technique
What Buck-Boost circuit was suitable for being influenced to change greatly by load sudden change by storage battery power supply or output voltage
DC power system increases level-one Buck-Boost circuit, the stability of whole system can be improved.One Buck-Boost converter body
Also referred to as buck-boost converter is that a kind of output voltage can be higher than input voltage and can be lower than the non-straight every type of input voltage again
Current converter.Traditional Buck-Boost topology output voltage and input voltage reverse phase, i.e. converter is that negative voltage is defeated
Out.In the practical application of field of power electronics, positive voltage converter uses extensive more than negative voltage converter, it is desirable that transformation
The output power that device provides is bigger, and existing One Buck-Boost converter body, such as four switch Buck-Boost circuits, power
Metal-oxide-semiconductor driving circuit is complicated, at high cost.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of Buck-Boost circuit, input voltage exports when changing
Voltage is constant all the time constant, and structure is simple, stable and reliable for performance, at low cost, can put into volume production.
In order to solve the above-mentioned technical problem, the utility model provides a kind of Buck-Boost circuit, including power supply chip,
Metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3, inductance L, capacitor C, one R1 of resistance, two R2 of resistance, three R3 of resistance；The power supply chip tool
There are the first PWM output end, the 2nd PWM output end and output feedback end；
The first PWM output end and the 2nd PWM output end are separately connected the grid of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2；Metal-oxide-semiconductor
The drain electrode of Q1 connects voltage input end Vin, the drain electrode of the source electrode connection metal-oxide-semiconductor Q2 of metal-oxide-semiconductor Q1, the source electrode ground connection of metal-oxide-semiconductor Q2；
The first end of the drain electrode connection inductance L of metal-oxide-semiconductor Q3, the source electrode and metal-oxide-semiconductor of the second end connection metal-oxide-semiconductor Q1 of inductance L
The drain electrode of Q2；The second end of inductance L is also connected with the grid that metal-oxide-semiconductor Q3 is connected to after resistance one, the source electrode ground connection of metal-oxide-semiconductor Q3；
Resistance two and resistance three are connected, and being integrally attached between the first end and ground of inductance L after the two series connection, resistance
One connects the output feedback end with the divider node A of resistance two；
Entirety after resistance two and resistance three are connected is in parallel with capacitor C, and one end that capacitor C is connect with inductance L first end connects
Meet voltage output end Vout.
It further comprise it further include one D1 of diode, the yin of diode one in one preferred embodiment of the utility model
Pole ground connection, anode connect the drain electrode of the source electrode and metal-oxide-semiconductor Q2 of metal-oxide-semiconductor Q1.
It further comprise it further include two D2 of diode in one preferred embodiment of the utility model, diode two and electricity
Resistance one is in parallel, and the grid of the cathode connection metal-oxide-semiconductor Q3 of diode two, anode connect the second end of inductance L.
It further comprise it further include three D3 of diode, the sun of diode three in one preferred embodiment of the utility model
Pole connects the first end of inductance and the drain electrode of metal-oxide-semiconductor Q3, and cathode connects capacitor and voltage output end.
It further comprise it further include voltage-stabiliser tube Z in one preferred embodiment of the utility model, the anode of voltage-stabiliser tube connects
Ground, cathode connect the grid of metal-oxide-semiconductor Q3.
It further comprise that the metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q3 are in one preferred embodiment of the utility model
N-channel MOS pipe.
The utility model has the beneficial effects that the Buck-Boost circuit of the utility model, output electricity when input voltage changes
Pressure is constant all the time constant, and according to the variation of input voltage, there are three types of operating modes for circuit tool: Buck mode, Boost mode and
Buck-Boost mode；Structure is simple, stable and reliable for performance, at low cost, can put into volume production.
Detailed description of the invention
Fig. 1 is the circuit diagram of Buck-Boost circuit in the preferred embodiment in the utility model；
The timing diagram of Vin, Vout, metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 when Fig. 2 is the operation of Buck-Boost circuit.
Specific embodiment
The utility model is described in further detail in the following with reference to the drawings and specific embodiments, so that those skilled in the art
The utility model may be better understood and can be practiced, but illustrated embodiment is not as the restriction to the utility model.
Embodiment
As shown in Figure 1, the present embodiment discloses a kind of Buck-Boost circuit, including power supply chip, metal-oxide-semiconductor Q1, metal-oxide-semiconductor
Q2, metal-oxide-semiconductor Q3, inductance L, capacitor C, one R1 of resistance, two R2 of resistance, three R3 of resistance, one D1 of diode, two D2 of diode, two poles
Pipe three D3 and voltage-stabiliser tube Z.In the present embodiment technical solution, it is preferable to use N ditches by above-mentioned metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q3
Road metal-oxide-semiconductor；One D1 of diode, it is preferable to use Schottky diodes by two D2 of diode.
Above-mentioned power supply chip U1 is the decompression chip that can directly buy on existing market, has the first PWM output end
HV, the 2nd PWM output end LV and output feedback end FB.
Above-mentioned first PWM output end and the 2nd PWM output end are separately connected the grid of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2；Metal-oxide-semiconductor
The drain electrode of Q1 connects voltage input end Vin, the drain electrode of the source electrode connection metal-oxide-semiconductor Q2 of metal-oxide-semiconductor Q1, the source electrode ground connection of metal-oxide-semiconductor Q2.
The minus earth of one D1 of diode, anode connect the drain electrode of the source electrode and metal-oxide-semiconductor Q2 of metal-oxide-semiconductor Q1.
The first end of the drain electrode connection inductance L of metal-oxide-semiconductor Q3, the source electrode ground connection of metal-oxide-semiconductor Q3, the second end of inductance L connect MOS
The drain electrode of the source electrode and metal-oxide-semiconductor Q2 of pipe Q1；One R1 of resistance is in parallel with two D1 of diode, and whole one end after the two parallel connection connects
The second end of inductance L is connect, the other end connects the grid of metal-oxide-semiconductor Q3；And the grid of the anode connection metal-oxide-semiconductor Q3 of two D1 of diode.
The plus earth of voltage-stabiliser tube Z, cathode connect the grid of metal-oxide-semiconductor Q3.
The first end of the anode connection inductance L of three D3 of diode and the drain electrode of metal-oxide-semiconductor Q3, cathode connect capacitor C and electricity
Press output end vo ut.
Two R2 of resistance and three R3 of resistance series connection, and the cathode of whole one end connection three D3 of diode after the two series connection,
Other end ground connection.Two R2 of resistance connects the output feedback end FB of above-mentioned power supply chip with the divider node A of three R3 of resistance.Resistance two
Entirety after R2 and three R3 of resistance series connection is in parallel with capacitor C, and one end that capacitor C is connect with inductance L first end connects voltage output
Hold Vout.
The Buck-Boost of the above structure, its working principles are as follows:
In switch periods T, metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 alternate conduction: metal-oxide-semiconductor Q1 conducting, metal-oxide-semiconductor Q2 (pass through when closing
The first PWM output end HV, the 2nd PWM output end LV the output low and high level of power supply chip control), in circuit as shown in Figure 1
The voltage of node V1 is input voltage vin, the grid of metal-oxide-semiconductor Q3 by one R1 of resistance driving conducting, timing diagram as shown in Fig. 2,
Input voltage charges to inductance L at this time, and inductance L constantly stores energy during this period, and current direction is as shown in the A-1 of Fig. 1；MOS
Pipe Q1 is closed, and when metal-oxide-semiconductor Q2 is connected, metal-oxide-semiconductor Q3 is closed at this time, and inductance L memory is reversed, and node V1 voltage rapidly drops to zero,
Inductance L forms discharge loop, the A-2 institute of current direction such as Fig. 1 by three D3 of diode, capacitor C, one D1 of diode, metal-oxide-semiconductor Q2
Show；Voltage-stabiliser tube Z is by the grid voltage V of metal-oxide-semiconductor Q3GSIt clamps down within the scope of safe voltage, prevents the V of metal-oxide-semiconductor Q3GSVoltage is because of mistake
It is high and puncture.Metal-oxide-semiconductor Q3 is when being shutdown by ON transitions, the grid voltage V of metal-oxide-semiconductor Q3GSIt is quickly put by two D2 of diode
Electricity to zero plays the role of that metal-oxide-semiconductor Q3 is helped to accelerate to close end.Two R2 of resistance and three R3 of resistance determines output voltage Vout, power supply
The partial pressure value that chip U1 hinders surely according to sampling feedback determines the conducting dutycycle of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2, with input voltage
Variation so that circuit enters Buck mode, Boost mode and Buck-Boost mode, and keeps defeated to automatically adjust duty ratio
The stabilization of voltage out.
The operating mode of the above Buck-Boost circuit is influenced by the variation of input voltage, can be divided into following Three models:
As shown in table 1, (1) input voltage vin is higher than output voltage Vout, and circuit works in Buck mode, and input voltage is higher, MOS
The turn-on time of pipe Q1 and metal-oxide-semiconductor Q2 are shorter, i.e., duty ratio (D=Ton/T) is smaller；Conversely, input voltage is lower, duty ratio is got over
Greatly.(2) input voltage vin is approximately equal to output voltage Vout, and circuit works in Buck-Boost mode, and output voltage is approximately equal to defeated
Enter voltage.(3) input voltage vin is lower than output voltage Vout, and circuit works in Boost mode, and input voltage is higher, metal-oxide-semiconductor
The turn-on time of Q1 and metal-oxide-semiconductor Q2 are shorter, i.e., duty ratio (D=Ton/T) is smaller；Conversely, input voltage is lower, duty ratio is got over
Greatly.
Table 1 is the corresponding operating mode of Buck-Boost circuit
| Input voltage | Operating mode | Output voltage |
| Vin>Vout | Buck | Vout=Vin*D |
| Vin≈Vout | Buck-Boost | Vout≈Vin |
| Vin<Vout | Boost | Vout≈Vin*D/(1-D) |
Above-mentioned Buck-Boost circuit can be divided into following two according to the difference of power supply chip: (1) power supply chip is same
Buck converter is walked, one D1 of diode in A-3 dotted line frame as shown in Figure 1 can not used, can also not used.Use two poles
One D1 of pipe is metal-oxide-semiconductor Q1 shutdown moment, and electric current is formed into a loop by one D1 of diode, and loss is added on one D1 of diode；Do not make
With one D1 of diode, metal-oxide-semiconductor Q1 shutdown moment, electric current is formed into a loop by metal-oxide-semiconductor Q2 internal diode, and loss is added in metal-oxide-semiconductor
On Q2.(2) power supply chip is common decompression chip, i.e. non-synchronous buck converter, one D1 of diode must be used, metal-oxide-semiconductor Q2
When shutdown, one D1 of diode forms discharge loop powering load in inductance L as freewheeling diode, capacitor C.
Embodiment described above is only preferred embodiments for fully illustrating the utility model, the utility model
Protection scope it is without being limited thereto.Those skilled in the art made equivalent substitute or change on the basis of the utility model
It changes, both is within the protection scope of the present invention.The protection scope of the utility model is subject to claims.
Claims (6)
1. a kind of Buck-Boost circuit, it is characterised in that: including power supply chip, metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3, inductance
(L), capacitor (C), resistance one (R1), resistance two (R2), resistance three (R3)；The power supply chip has the first PWM output end, the
Two PWM output ends and output feedback end；
The first PWM output end and the 2nd PWM output end are separately connected the grid of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2；Metal-oxide-semiconductor Q1's
Drain electrode connection voltage input end (Vin), the drain electrode of the source electrode connection metal-oxide-semiconductor Q2 of metal-oxide-semiconductor Q1, the source electrode ground connection of metal-oxide-semiconductor Q2；
The first end of drain electrode connection inductance (L) of metal-oxide-semiconductor Q3, the source electrode and metal-oxide-semiconductor of the second end connection metal-oxide-semiconductor Q1 of inductance (L)
The drain electrode of Q2；The second end of inductance (L) is also connected with the grid that metal-oxide-semiconductor Q3 is connected to after resistance one, the source electrode ground connection of metal-oxide-semiconductor Q3；
Resistance two and resistance three are connected, and being integrally attached between the first end and ground of inductance (L) after the two series connection, resistance one
The output feedback end is connected with the divider node A of resistance two；
Entirety after resistance two and resistance three are connected is in parallel with capacitor (C), one end that capacitor (C) is connect with inductance (L) first end
It connects voltage output end (Vout).
2. Buck-Boost circuit as described in claim 1, it is characterised in that: it further includes diode one (D1), diode
One minus earth, anode connect the drain electrode of the source electrode and metal-oxide-semiconductor Q2 of metal-oxide-semiconductor Q1.
3. Buck-Boost circuit as described in claim 1, it is characterised in that: it further includes diode two (D2), diode
Two is in parallel with resistance one, and the grid of the cathode connection metal-oxide-semiconductor Q3 of diode two, anode connect the second end of inductance (L).
4. Buck-Boost circuit as described in claim 1, it is characterised in that: it further includes diode three (D3), diode
The first end of three anode connection inductance and the drain electrode of metal-oxide-semiconductor Q3, cathode connect capacitor and voltage output end.
5. Buck-Boost circuit as described in claim 1, it is characterised in that: it further includes voltage-stabiliser tube (Z), and voltage-stabiliser tube is just
Pole ground connection, cathode connect the grid of metal-oxide-semiconductor Q3.
6. Buck-Boost circuit as described in claim 1, it is characterised in that: the metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q3
It is N-channel MOS pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920129622.2U CN209593289U (en) | 2019-01-25 | 2019-01-25 | Buck-Boost circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920129622.2U CN209593289U (en) | 2019-01-25 | 2019-01-25 | Buck-Boost circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209593289U true CN209593289U (en) | 2019-11-05 |
Family
ID=68380568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920129622.2U Active CN209593289U (en) | 2019-01-25 | 2019-01-25 | Buck-Boost circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209593289U (en) |
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2019
- 2019-01-25 CN CN201920129622.2U patent/CN209593289U/en active Active
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