CN110247546A - Non-isolation type biswitch reduction voltage circuit and DC-DC converter - Google Patents
Non-isolation type biswitch reduction voltage circuit and DC-DC converter Download PDFInfo
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- CN110247546A CN110247546A CN201910481579.0A CN201910481579A CN110247546A CN 110247546 A CN110247546 A CN 110247546A CN 201910481579 A CN201910481579 A CN 201910481579A CN 110247546 A CN110247546 A CN 110247546A
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- 238000002955 isolation Methods 0.000 title claims abstract description 65
- 239000003990 capacitor Substances 0.000 claims abstract description 88
- 238000004146 energy storage Methods 0.000 claims abstract description 9
- 230000006837 decompression Effects 0.000 claims abstract description 7
- 230000005611 electricity Effects 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 230000003276 anti-hypertensive effect Effects 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
- H02M3/072—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps adapted to generate an output voltage whose value is lower than the input voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The embodiment of the invention provides a kind of non-isolation type biswitch reduction voltage circuit and DC-DC converters, reduction voltage circuit includes positive input terminal, positive output end, negative input end, negative output terminal, first switch tube, the first inductance, first diode and filter unit, the reduction voltage circuit further includes partial pressure unit and discharge paths, in which: the first switch tube, the first inductance, partial pressure unit are connected in series between the positive input terminal and positive output end；The anode of the first diode is connected to the negative input end, cathode is connected to the tie point of the first switch tube and the first inductance；The partial pressure unit includes at least one storage capacitor, and the energy storage when the first switch tube is connected of first inductance and the storage capacitor, and is discharged when the first switch tube is disconnected by the discharge paths.The present invention improves switching device utilization rate, realizes multilevel decompression effect.
Description
Technical field
The present invention relates to electronic technology fields, more specifically, being related to a kind of non-isolation type biswitch reduction voltage circuit and straight
Stream-DC converter.
Background technique
DC-DC converter is matching voltage grade in middle pressure convergence net, access DC equipment, realizes power control
Key equipment.DC-DC converter includes reduction voltage circuit (buck).
Traditional buck circuit generally takes following manner to be depressured: energy being stored and discharged by inductance, is controlled
Storage time processed, achievees the purpose that decompression；By coupling inductance, coupling inductance joined on the basis of original circuit step-down ratio
This control variable of turn ratio, achievees the purpose that further to be depressured；By the way that transformer is added, isolated reduction voltage circuit is formed, is reached
To decompression, electrically from purpose；It is depressured by linear voltage regulator.
However, above-mentioned conventional buck circuit (buck) all has certain problems using upper: using the decompression of inductance
Circuit, in high step-down ratio, i.e., when switching tube duty ratio goes to zero, there is switching device utilization rate is low, device is electric
Pressure and current stress is big, dv/dt greatly caused by EMI is serious, integrated circuit loss is excessive, anti-input voltage disturbance ability is poor, with
And the problems such as bad dynamic performance；Existed using coupling inductance or the reduction voltage circuit of transformer due to the addition of magnetic core, skeleton
Circuit volume is excessive, since the presence of circuit leakage inductance causes stresses of parts to increase, and easily causes the relevant issues such as electromagnetic interference；
Using the reduction voltage circuit of linear voltage regulator, when height is dropped than requiring, loss is excessive, and device heating is serious.
Summary of the invention
Embodiment technical problems to be solved of the embodiment of the present invention are, for the non-isolated more reduction technologies of above-mentioned biswitch
Scheme provides that a kind of non-isolation type is double to be opened high drop, the circuit leakage inductance more too low than applicable cases lower switch devices use rate the problems such as
Close reduction voltage circuit and DC-DC converter.
The technical solution that embodiment of the embodiment of the present invention solves above-mentioned technical problem is to provide a kind of non-isolation type biswitch
Reduction voltage circuit, including positive input terminal, positive output end, negative input end, negative output terminal, first switch tube, the first inductance, the one or two pole
Pipe and filter unit, the reduction voltage circuit further include partial pressure unit and discharge paths, in which: the first switch tube, first
Inductance, partial pressure unit are connected in series between the positive input terminal and positive output end；The anode of the first diode is connected to
The negative input end, cathode are connected to the tie point of the first switch tube and the first inductance；The partial pressure unit includes at least
One storage capacitor, and the energy storage when the first switch tube is connected of first inductance and the storage capacitor, described
One switching tube is discharged when disconnecting by the discharge paths.
In non-isolation type biswitch reduction voltage circuit described in the embodiment of the present invention, the discharge paths include second switch
Pipe, one end of the second switch is connected to the negative input end, the other end is connected to first inductance and partial pressure unit
Tie point, and the second switch disconnected when the first switch tube is connected, the first switch tube disconnect when lead
It is logical.
In non-isolation type biswitch reduction voltage circuit described in the embodiment of the present invention, the reduction voltage circuit further includes that control is single
Member, the output end of described control unit is connected respectively to the control terminal of the first switch tube and second switch, and output makes
The first switch tube and the opposite pulse width modulating signal of second switch on state.
In non-isolation type biswitch reduction voltage circuit described in the embodiment of the present invention, the partial pressure unit includes the first energy storage
Capacitor, and the first end of first storage capacitor be connected respectively to first inductance output end and the second switch
Cathode, the second end of first storage capacitor is connected to the filter unit.
In non-isolation type biswitch reduction voltage circuit described in the embodiment of the present invention, the partial pressure unit includes the second energy storage
Capacitor, third storage capacitor, the second diode, third diode and the 4th diode；Second storage capacitor, the two or two
Pole pipe and the connection of third energy storage capacitor in series, the first end of second storage capacitor is connected to first inductance, described
The second end of third storage capacitor is connected to the filter unit, and the anode of second diode and second energy storage electricity
The second end connection of appearance, cathode are connect with the first end of the third storage capacitor, and the cathode of the third diode is connected to
The first end of second storage capacitor, anode are connected to the first end of the third storage capacitor, the 4th diode
Cathode is connected to the second end of second storage capacitor, anode is connected to the filter unit.
In non-isolation type biswitch reduction voltage circuit described in the embodiment of the present invention, the partial pressure unit includes N number of energy storage
Capacitor and M diode, wherein the N is the positive integer more than or equal to 3, M=3 × N-3；N number of storage capacitor
It is successively connected in series afterwards in a manner of there is a diode between adjacent storage capacitor；In addition to first end is directly connected to described
Outside the storage capacitor of one inductance, the first end of remaining each storage capacitor is connected to first electricity via a diode
Sense；Other than second end is directly connected to the storage capacitor of the filter unit, the filter unit passes through two poles respectively
Pipe is connected to the second end of remaining each storage capacitor.
In non-isolation type biswitch reduction voltage circuit described in the embodiment of the present invention, the reduction voltage circuit further includes the second electricity
Sense, the 5th diode, the output end of the partial pressure unit are connected to the positive output end via the 5th diode, and described the
The first end of two inductance is connected to the second end of the tie point of the partial pressure unit and the 5th diode, second inductance
It is connected to the negative input end.
In non-isolation type biswitch reduction voltage circuit described in the embodiment of the present invention, the reduction voltage circuit further includes third electricity
Sense, the 6th diode, the output end of the partial pressure unit is via the third inductance connection to the positive output end, and the described 6th
The cathode of diode is connected to the partial pressure unit and connects with the anode of the tie point of the third inductance, the 6th diode
To the negative input end.
In non-isolation type biswitch reduction voltage circuit described in the embodiment of the present invention, the filter unit includes filtered electrical
Hold, and the first end of the filter capacitor is connected to the positive output end, second end is connected to the negative output terminal.
The embodiment of the invention also provides a kind of DC-DC converter, the DC-DC converter includes above-mentioned
Non-isolation type biswitch reduction voltage circuit in any embodiment.
The non-isolation type biswitch reduction voltage circuit and DC-DC converter of the embodiment of the present invention, by reduction voltage circuit
Middle introducing capacitance partial pressure unit is not necessarily to coupling inductance or transformer, avoids and is lost excessive and introduces what magnetic element generated
The problems such as electromagnetic interference, circuit leakage inductance, improves the problem of conventional buck circuit switch pipe duty ratio size limits, improves out
Devices use rate is closed, multilevel decompression effect is realized.Meanwhile the quantity by increasing derided capacitors and diode, further
Multilevel partial-pressure unit is introduced, realizes the function by switching tube duty ratio size continuous control output voltage, there are a variety of different drops
Effect is pressed, can be selected according to practical application, widen the application range of reduction voltage circuit.
Detailed description of the invention
Fig. 1 is the non-isolation type biswitch reduction voltage circuit topological diagram of the embodiment of the present invention；
Fig. 2 is the working waveform figure of a partial pressure type non-isolation type biswitch reduction voltage circuit of the embodiment of the present invention；
Fig. 3 is a partial pressure type non-isolation type biswitch reduction voltage circuit topological diagram of the embodiment of the present invention；
Fig. 4 is partial pressure type non-isolation type biswitch reduction voltage circuit the first operation mode figure of the embodiment of the present invention；
Fig. 5 is partial pressure type non-isolation type biswitch reduction voltage circuit the second operation mode figure of the embodiment of the present invention
Fig. 6 is two partial pressure type non-isolation type biswitch reduction voltage circuit topological diagrams of the embodiment of the present invention；
Fig. 7 is two partial pressure type non-isolation type biswitch reduction voltage circuit the first operation mode figures of the embodiment of the present invention；
Fig. 8 is two partial pressure type non-isolation type biswitch reduction voltage circuit the second operation mode figures of the embodiment of the present invention；
Fig. 9 is the N partial pressure type non-isolation type biswitch reduction voltage circuit topological diagram of the embodiment of the present invention；
Figure 10 is a partial pressure type non-isolation type biswitch reduction voltage circuit topological diagram of another embodiment of the present invention；
Figure 11 is the two partial pressure type non-isolation type biswitch reduction voltage circuit topological diagrams of another embodiment of the present invention；
Figure 12 is the N partial pressure type non-isolation type biswitch reduction voltage circuit topological diagram of another embodiment of the present invention.
Specific embodiment
In order to which the objects, technical solutions and advantages of the embodiment of the present invention are more clearly understood, below in conjunction with attached drawing and reality
Example is applied, the embodiment of the present invention is further elaborated.It should be appreciated that specific embodiment described herein is only used to
It explains the embodiment of the present invention, is not intended to limit the present invention embodiment.
The non-isolation type biswitch reduction voltage circuit of the embodiment of the present invention can be applied to high step-down applications scene, as shown in Figure 1,
The non-isolation type biswitch reduction voltage circuit of the present embodiment includes positive input terminal Vin+, positive output end Vo+, negative input end Vin, bear it is defeated
Outlet Vo, first switch tube S1, the first inductance L1, first diode D1And filter unit, the reduction voltage circuit further include point
Press unit 1 and discharge paths, in which: the first switch tube S1, the first inductance L1, partial pressure unit 1 be connected in series in it is described just defeated
Enter to hold Vin+ and positive output end Vo+ between；The first diode D1Anode be connected to the negative input end Vin, cathode connection
To the first switch tube S1With the first inductance L1Tie point；The partial pressure unit 1 includes at least one storage capacitor, described
Discharge paths are in the first switch tube S1It is the first inductance L when disconnection1It discharges with storage capacitor.The filter unit packet
Include filter capacitor C0, and the filter capacitor C0First end be connected to the positive output end Vo+, second end be connected to it is described negative
Output end Vo-。
Above-mentioned non-isolation type biswitch reduction voltage circuit, by introducing capacitance partial pressure list on the basis of conventional buck circuit
Member is not necessarily to coupling inductance or transformer, antihypertensive effect can be realized while providing high step-down ratio, to avoid switching device
The problems such as utilization rate is too low, circuit leakage inductance.
In one embodiment of the invention, above-mentioned discharge paths specifically may include second switch S2, the second switch
Pipe S2Anode be connected to the negative input end Vin, cathode be connected to the first inductance L1With the tie point of partial pressure unit 1,
And the second switch S2With first switch tube S1On state it is opposite, that is, first switch tube S1With second switch S2's
Driving signal is complementary signal, and physical circuit working waveform figure is as shown in Figure 2.In figure, Vgs1For first switch tube S1Control letter
Number, Vgs2For the control signal of second switch S2, and Vgs1With Vgs2Waveform it is complementary, i.e. first switch tube S1Second when conducting
Switching tube S2It disconnects, first switch tube S1Second switch S when disconnection2Conducting.
Above-mentioned first switch tube S1With second switch S2On-off control can be realized by pulse width modulating signal, that is, is dropped
Volt circuit further includes control unit, and the output end of the control unit is connected respectively to the first switch tube S1And second switch
S2Control terminal, and the control unit output make the first switch tube S1With second switch S2The opposite pulse of on state
Bandwidth modulation signals, to control first switch tube S1With second switch S2Turn on and off.
Above-mentioned reduction voltage circuit may also include the second inductance Lo, the 5th diode D2, the output end of the partial pressure unit 1 via
The 5th diode D2It is connected to the positive output end Vo+, the second inductance LoFirst end be connected to the partial pressure unit
1 and the 5th diode D2Tie point, the second inductance LoSecond end be connected to the negative input end Vo-.Pass through control
First switch tube S processed1With second switch S2Working condition, the second inductance Lo, the 5th diode D2Realize filling for storage capacitor
Electricity or electric discharge.
As shown in figure 3, the embodiment provides an a kind of partial pressure type non-isolation type biswitch reduction voltage circuits, wherein
One partial pressure unit 11 includes the first storage capacitor C1, and the first storage capacitor C1First end be connected respectively to described first
Inductance L1Output end and the second switch S2Cathode, the first storage capacitor C1Second end be connected to the filter
Wave unit.Specifically, by introducing the first storage capacitor C in a partial pressure type non-isolation type biswitch reduction voltage circuit topology1,
In as first switch tube S1Conducting, second switch S2When shutdown, the first work of a partial pressure type non-isolation type biswitch reduction voltage circuit
Make mode as shown in figure 4, the electric energy of input terminal passes through first switch tube S1, the first inductance L1, the first storage capacitor C1With the five or two
Pole pipe D2It is transmitted to output end, the second inductance LoPass through the 5th diode D2Afterflow, electric current decline.As first switch tube S1Shutdown,
Second switch S2When conducting, the second operation mode of a partial pressure type non-isolation type biswitch reduction voltage circuit is as shown in figure 5, first
Inductance L1Pass through second switch S2Afterflow, the first storage capacitor C1Pass through second switch S2With the second inductance LoIt discharges,
Second inductance LoElectric current rises.The gain calculation formula of one partial pressure type non-isolation type biswitch reduction voltage circuit is as follows:
Wherein, VoFor output voltage, VinFor input voltage, D1For first switch tube S1Duty ratio size, D2It is opened for second
Close pipe S2Duty ratio size.
As shown in fig. 6, the embodiment provides a kind of two partial pressure type non-isolation type biswitch reduction voltage circuits,
In, two partial pressure units 12 include the second storage capacitor C1', third storage capacitor C2', the second diode D3', third diode D4'
And the 4th diode D5'；The second storage capacitor C1', the second diode D3' and third storage capacitor C2' series connection company
It connects, the second storage capacitor C1' first end be connected to the first inductance L1, the third storage capacitor C2' second end
It is connected to the 5th diode D2Anode, and the second diode D3' anode and the second storage capacitor C1'
Second end connection, cathode and the third storage capacitor C2' first end connection, the third diode D4' cathode be connected to
The second storage capacitor C1' first end, anode be connected to third storage capacitor C2' first end, the 4th diode
D5' cathode be connected to the second storage capacitor C1' second end, anode be connected to the second inductance LoFirst
End.Wherein, first switch tube S1With second switch S2Driving signal and a partial pressure type non-isolation type biswitch reduction voltage circuit protect
It holds unanimously, output voltage still passes through first switch tube S1With second switch S2Duty ratio size is adjusted.Work as first switch
Pipe S1Conducting, and second switch S2When shutdown, the first operation mode of two partial pressure type non-isolation type biswitch reduction voltage circuits is as schemed
Shown in 7, the electric energy of input terminal passes through first switch tube S1, the first inductance L1, the second storage capacitor C1', third storage capacitor C2'
With the 5th diode D2It is transmitted to output end, the second inductance LoPass through the 5th diode D2Afterflow, electric current decline.Work as first switch
Pipe S1Shutdown, and second switch S2When conducting, the second operation mode of two partial pressure type non-isolation type biswitch reduction voltage circuits is as schemed
Shown in 8, the first inductance L1 passes through second switch S2Afterflow, the second storage capacitor C1', third storage capacitor C2' opened by second
Close pipe S2With the second inductance LoIt discharges, the second inductance LoElectric current rises.By being depressured in a partial pressure type non-isolation type biswitch
Increasing a storage capacitor and three diodes, two partial pressure type non-isolation type biswitch reduction voltage circuits on circuit base realizes defeated
The effect that voltage halves out, i.e., in the case of same duty cycle, output voltage becomes original half.Two partial pressure type non-isolation types
The gain calculation formula of biswitch reduction voltage circuit is as follows:
Wherein, VoFor output voltage, VinFor input voltage, D1For first switch tube S1Duty ratio size, D2It is opened for second
Close pipe S2Duty ratio size.
As shown in figure 9, the embodiment provides a kind of N partial pressure type non-isolation type biswitch reduction voltage circuits, wherein
N partial pressure unit 13 includes N number of storage capacitor and M diode.The N is the positive integer more than or equal to 3, M=3 × N-
3；N number of storage capacitor is successively connected in series afterwards in a manner of having a diode between adjacent storage capacitor；In addition to first
End is directly connected to the first inductance L1Storage capacitor C1" outside, the first end of remaining each storage capacitor is via one two
Pole pipe is connected to the first inductance L1；In addition to second end is directly connected to the 5th diode D2Anode storage capacitor
CN" outside, the 5th diode D2Anode pass through a diode respectively and be connected to the second of remaining each storage capacitor
End.Wherein, first switch tube S1With second switch S2Driving signal and a partial pressure type non-isolation type biswitch reduction voltage circuit protect
It holds unanimously, output voltage still passes through first switch tube S1With second switch S2Duty ratio size is adjusted, in a differential pressure drop
Only by increasing storage capacitor and diode number in partial pressure unit, N partial pressure type non-isolation type biswitch on the basis of volt circuit
Reduction voltage circuit realizes the effect that output voltage is kept to original N/mono-.The increasing of N partial pressure type non-isolation type biswitch reduction voltage circuit
Beneficial calculation formula is as follows:
Wherein, VoFor output voltage, VinFor input voltage, D1For first switch tube S1Duty ratio size, D2It is opened for second
Close pipe S2Duty ratio size.
As shown in Figure 10, based on an above-mentioned partial pressure type non-isolation type biswitch reduction voltage circuit, the present invention provides another
One partial pressure type non-isolation type biswitch reduction voltage circuit of kind embodiment, reduction voltage circuit includes third inductance Lo', the 6th diode
D2', the output end of a partial pressure unit 11 is via the third inductance Lo' it is connected to the positive output end Vo+, the six or two pole
Pipe D2' cathode be connected to a partial pressure unit 11 and the third inductance Lo' tie point, the 6th diode D2' anode
It is connected to the negative input end Vo, it can also realize similar circuit buck functionality, the difference is that a partial pressure unit 11 output
Voltage is via third inductance Lo' filtering after, then be output to filter capacitor C0, i.e. the filtering mode of output end changed.This
Outside, the gain calculation formula of the circuit of the present embodiment is as follows:
Wherein, VoFor output voltage, VinFor input voltage, D1For first switch tube S1Duty ratio size, D2It is opened for second
Close pipe S2Duty ratio size.
Correspondingly, as shown in figure 11, on the basis of a partial pressure type non-isolation type biswitch reduction voltage circuit of Figure 10, the present invention
Another two partial pressure type non-isolation type biswitch reduction voltage circuit of embodiment is provided, filtering mode is consistent in Figure 10, the reality
The gain calculation formula for applying example is as follows:
Wherein, VoFor output voltage, VinFor input voltage, D1For first switch tube S1Duty ratio size, D2It is opened for second
Close pipe S2Duty ratio size.
Correspondingly, as shown in figure 12, on the basis of a partial pressure type non-isolation type biswitch reduction voltage circuit of Figure 10, the present invention
Another embodiment N partial pressure type non-isolation type biswitch reduction voltage circuit is provided, filtering mode is consistent in Figure 10, the implementation
The gain calculation formula of example is as follows:
Wherein, VoFor output voltage, VinFor input voltage, D1For first switch tube S1Duty ratio size, D2It is opened for second
Close pipe S2Duty ratio size.
The embodiment of the invention also provides a kind of DC-DC converter, which includes any of the above-described
Non-isolation type biswitch reduction voltage circuit in a embodiment.
The non-isolation type biswitch reduction voltage circuit and DC-DC converter of the embodiment of the present invention, by reduction voltage circuit
Middle introducing capacitance partial pressure unit avoids conventional buck mode and uses the loss of linear voltage regulator generation excessive and introduce magnetic
The electromagnetic interference problem that element generates improves the problem of conventional buck circuit switch pipe duty ratio size limits, realizes more
Grade antihypertensive effect.Meanwhile the quantity by increasing derided capacitors and diode, it is further introduced into Multilevel partial-pressure unit, is realized
By the function of switching tube duty ratio size continuous control output voltage, there are a variety of different antihypertensive effects, it can be according to practical application
Occasion is selected, and the application range of reduction voltage circuit has been widened.
The preferable specific embodiment of the above, the only embodiment of the present invention, but the protection scope of the embodiment of the present invention
It is not limited thereto, anyone skilled in the art, can be light in the technical scope that the embodiment of the present invention discloses
The change or replacement being readily conceivable that should all be covered within the protection scope of the embodiment of the present invention.Therefore, the guarantor of the embodiment of the present invention
Shield range should be subject to the protection scope in claims.
Claims (10)
1. a kind of non-isolation type biswitch reduction voltage circuit, including positive input terminal, positive output end, negative input end, negative output terminal, first
Switching tube, the first inductance, first diode and filter unit, which is characterized in that the reduction voltage circuit further includes partial pressure unit
And discharge paths, in which: the first switch tube, the first inductance, partial pressure unit are connected in series in the positive input terminal and just defeated
Between outlet；The anode of the first diode is connected to the negative input end, cathode is connected to the first switch tube and
The tie point of one inductance；The partial pressure unit includes at least one storage capacitor, and first inductance and the storage capacitor
The energy storage in first switch tube conducting, and discharged when the first switch tube is disconnected by the discharge paths.
2. non-isolation type biswitch reduction voltage circuit according to claim 1, which is characterized in that the discharge paths include the
Two switching tubes, one end of the second switch is connected to the negative input end, the other end is connected to first inductance and divides
The tie point of unit is pressed, and the second switch disconnects when the first switch tube is connected, is disconnected in the first switch tube
Conducting when opening.
3. non-isolation type biswitch reduction voltage circuit according to claim 2, which is characterized in that the reduction voltage circuit further includes
Control unit, the output end of described control unit are connected respectively to the control terminal of the first switch tube and second switch, and
Output makes the first switch tube and the opposite pulse width modulating signal of second switch on state.
4. non-isolation type biswitch reduction voltage circuit according to claim 3, which is characterized in that the partial pressure unit includes the
One storage capacitor, and the first end of first storage capacitor is connected respectively to the output end and described second of first inductance
The second end of the cathode of switching tube, first storage capacitor is connected to the filter unit.
5. non-isolation type biswitch reduction voltage circuit according to claim 3, which is characterized in that the partial pressure unit includes the
Two storage capacitors, third storage capacitor, the second diode, third diode and the 4th diode；Second storage capacitor,
Second diode and the connection of third energy storage capacitor in series, the first end of second storage capacitor are connected to first electricity
Sense, the second end of the third storage capacitor are connected to the filter unit, and the anode of second diode and described the
The second end connection of two storage capacitors, cathode are connect with the first end of the third storage capacitor, the yin of the third diode
Pole is connected to the first end of second storage capacitor, anode is connected to the first end of the third storage capacitor, and the described 4th
The cathode of diode is connected to the second end of second storage capacitor, anode is connected to the filter unit.
6. non-isolation type biswitch reduction voltage circuit according to claim 3, which is characterized in that the partial pressure unit includes N
A storage capacitor and M diode, wherein the N is the positive integer more than or equal to 3, M=3 × N-3；N number of storage
Energy capacitor is successively connected in series afterwards in a manner of having a diode between adjacent storage capacitor；In addition to first end is directly connected to
Outside the storage capacitor of first inductance, the first end of remaining each storage capacitor is connected to described via a diode
One inductance；Other than second end is directly connected to the storage capacitor of the filter unit, the filter unit passes through one respectively
Diode is connected to the second end of remaining each storage capacitor.
7. according to the described in any item non-isolation type biswitch reduction voltage circuits of claim 4-6, which is characterized in that the decompression electricity
Road further includes the second inductance, the 5th diode, and the output end of the partial pressure unit is connected to described via the 5th diode
Positive output end, the first end of second inductance are connected to the tie point, described of the partial pressure unit and the 5th diode
The second end of second inductance is connected to the negative input end.
8. according to the described in any item non-isolation type biswitch reduction voltage circuits of claim 4-6, which is characterized in that the decompression electricity
Road further includes third inductance, the 6th diode, the output end of the partial pressure unit via the third inductance connection to it is described just
The cathode of output end, the 6th diode is connected to the tie point of the partial pressure unit and the third inductance, the described 6th
The anode of diode is connected to the negative input end.
9. according to the described in any item non-isolation type biswitch reduction voltage circuits of claim 4-6, which is characterized in that the filtering is single
Member include filter capacitor, and the first end of the filter capacitor is connected to the positive output end, second end be connected to it is described bear it is defeated
Outlet.
10. a kind of DC-DC converter, which is characterized in that the DC-DC converter includes appointing in claim 1-9
Non-isolation type biswitch reduction voltage circuit described in one.
Priority Applications (1)
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|---|---|---|---|
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| CN114640262A (en) * | 2022-05-16 | 2022-06-17 | 广东希荻微电子股份有限公司 | Voltage conversion circuit and electronic device |
| CN114679059A (en) * | 2022-05-30 | 2022-06-28 | 广东希荻微电子股份有限公司 | Voltage reduction circuit and electronic equipment |
| US11539296B2 (en) | 2021-05-21 | 2022-12-27 | Halo Microelectronics International | Hybrid power conversion system and control method |
| US11817770B2 (en) | 2021-05-21 | 2023-11-14 | Halo Microelectronics International | Hybrid power conversion system and control method |
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